Tom Rini | 83d290c | 2018-05-06 17:58:06 -0400 | [diff] [blame] | 1 | # SPDX-License-Identifier: GPL-2.0+ |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2 | # |
Wolfgang Denk | eca3aeb | 2013-06-21 10:22:36 +0200 | [diff] [blame] | 3 | # (C) Copyright 2000 - 2013 |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 4 | # Wolfgang Denk, DENX Software Engineering, wd@denx.de. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 5 | |
| 6 | Summary: |
| 7 | ======== |
| 8 | |
wdenk | 24ee89b | 2002-11-03 17:56:27 +0000 | [diff] [blame] | 9 | This directory contains the source code for U-Boot, a boot loader for |
wdenk | e86e5a0 | 2004-10-17 21:12:06 +0000 | [diff] [blame] | 10 | Embedded boards based on PowerPC, ARM, MIPS and several other |
| 11 | processors, which can be installed in a boot ROM and used to |
| 12 | initialize and test the hardware or to download and run application |
| 13 | code. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 14 | |
| 15 | The development of U-Boot is closely related to Linux: some parts of |
wdenk | 24ee89b | 2002-11-03 17:56:27 +0000 | [diff] [blame] | 16 | the source code originate in the Linux source tree, we have some |
| 17 | header files in common, and special provision has been made to |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 18 | support booting of Linux images. |
| 19 | |
| 20 | Some attention has been paid to make this software easily |
| 21 | configurable and extendable. For instance, all monitor commands are |
| 22 | implemented with the same call interface, so that it's very easy to |
| 23 | add new commands. Also, instead of permanently adding rarely used |
| 24 | code (for instance hardware test utilities) to the monitor, you can |
| 25 | load and run it dynamically. |
| 26 | |
| 27 | |
| 28 | Status: |
| 29 | ======= |
| 30 | |
| 31 | In general, all boards for which a configuration option exists in the |
wdenk | 24ee89b | 2002-11-03 17:56:27 +0000 | [diff] [blame] | 32 | Makefile have been tested to some extent and can be considered |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 33 | "working". In fact, many of them are used in production systems. |
| 34 | |
Robert P. J. Day | 7207b36 | 2015-12-19 07:16:10 -0500 | [diff] [blame] | 35 | In case of problems see the CHANGELOG file to find out who contributed |
| 36 | the specific port. In addition, there are various MAINTAINERS files |
| 37 | scattered throughout the U-Boot source identifying the people or |
| 38 | companies responsible for various boards and subsystems. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 39 | |
Robert P. J. Day | 7207b36 | 2015-12-19 07:16:10 -0500 | [diff] [blame] | 40 | Note: As of August, 2010, there is no longer a CHANGELOG file in the |
| 41 | actual U-Boot source tree; however, it can be created dynamically |
| 42 | from the Git log using: |
Robert P. J. Day | adb9d85 | 2012-11-14 02:03:20 +0000 | [diff] [blame] | 43 | |
| 44 | make CHANGELOG |
| 45 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 46 | |
| 47 | Where to get help: |
| 48 | ================== |
| 49 | |
wdenk | 24ee89b | 2002-11-03 17:56:27 +0000 | [diff] [blame] | 50 | In case you have questions about, problems with or contributions for |
Robert P. J. Day | 7207b36 | 2015-12-19 07:16:10 -0500 | [diff] [blame] | 51 | U-Boot, you should send a message to the U-Boot mailing list at |
Peter Tyser | 0c32565 | 2008-09-10 09:18:34 -0500 | [diff] [blame] | 52 | <u-boot@lists.denx.de>. There is also an archive of previous traffic |
| 53 | on the mailing list - please search the archive before asking FAQ's. |
Naoki Hayama | 6681bbb | 2020-10-08 13:16:18 +0900 | [diff] [blame] | 54 | Please see https://lists.denx.de/pipermail/u-boot and |
| 55 | https://marc.info/?l=u-boot |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 56 | |
Wolfgang Denk | 218ca72 | 2008-03-26 10:40:12 +0100 | [diff] [blame] | 57 | Where to get source code: |
| 58 | ========================= |
| 59 | |
Robert P. J. Day | 7207b36 | 2015-12-19 07:16:10 -0500 | [diff] [blame] | 60 | The U-Boot source code is maintained in the Git repository at |
Heinrich Schuchardt | a3bbd0b | 2021-02-24 13:19:04 +0100 | [diff] [blame] | 61 | https://source.denx.de/u-boot/u-boot.git ; you can browse it online at |
| 62 | https://source.denx.de/u-boot/u-boot |
Wolfgang Denk | 218ca72 | 2008-03-26 10:40:12 +0100 | [diff] [blame] | 63 | |
Naoki Hayama | c4bd51e | 2020-10-08 13:16:25 +0900 | [diff] [blame] | 64 | The "Tags" links on this page allow you to download tarballs of |
Marcel Ziswiler | 11ccc33 | 2008-07-09 08:17:15 +0200 | [diff] [blame] | 65 | any version you might be interested in. Official releases are also |
Naoki Hayama | c4bd51e | 2020-10-08 13:16:25 +0900 | [diff] [blame] | 66 | available from the DENX file server through HTTPS or FTP. |
| 67 | https://ftp.denx.de/pub/u-boot/ |
| 68 | ftp://ftp.denx.de/pub/u-boot/ |
Wolfgang Denk | 218ca72 | 2008-03-26 10:40:12 +0100 | [diff] [blame] | 69 | |
| 70 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 71 | Where we come from: |
| 72 | =================== |
| 73 | |
| 74 | - start from 8xxrom sources |
Naoki Hayama | 047f6ec | 2020-10-08 13:17:16 +0900 | [diff] [blame] | 75 | - create PPCBoot project (https://sourceforge.net/projects/ppcboot) |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 76 | - clean up code |
| 77 | - make it easier to add custom boards |
| 78 | - make it possible to add other [PowerPC] CPUs |
| 79 | - extend functions, especially: |
| 80 | * Provide extended interface to Linux boot loader |
| 81 | * S-Record download |
| 82 | * network boot |
Simon Glass | 9e5616d | 2019-08-01 09:47:14 -0600 | [diff] [blame] | 83 | * ATA disk / SCSI ... boot |
Naoki Hayama | 047f6ec | 2020-10-08 13:17:16 +0900 | [diff] [blame] | 84 | - create ARMBoot project (https://sourceforge.net/projects/armboot) |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 85 | - add other CPU families (starting with ARM) |
Naoki Hayama | 047f6ec | 2020-10-08 13:17:16 +0900 | [diff] [blame] | 86 | - create U-Boot project (https://sourceforge.net/projects/u-boot) |
| 87 | - current project page: see https://www.denx.de/wiki/U-Boot |
wdenk | 24ee89b | 2002-11-03 17:56:27 +0000 | [diff] [blame] | 88 | |
| 89 | |
| 90 | Names and Spelling: |
| 91 | =================== |
| 92 | |
| 93 | The "official" name of this project is "Das U-Boot". The spelling |
| 94 | "U-Boot" shall be used in all written text (documentation, comments |
| 95 | in source files etc.). Example: |
| 96 | |
| 97 | This is the README file for the U-Boot project. |
| 98 | |
| 99 | File names etc. shall be based on the string "u-boot". Examples: |
| 100 | |
| 101 | include/asm-ppc/u-boot.h |
| 102 | |
| 103 | #include <asm/u-boot.h> |
| 104 | |
| 105 | Variable names, preprocessor constants etc. shall be either based on |
| 106 | the string "u_boot" or on "U_BOOT". Example: |
| 107 | |
| 108 | U_BOOT_VERSION u_boot_logo |
| 109 | IH_OS_U_BOOT u_boot_hush_start |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 110 | |
| 111 | |
wdenk | 93f19cc | 2002-12-17 17:55:09 +0000 | [diff] [blame] | 112 | Versioning: |
| 113 | =========== |
| 114 | |
Thomas Weber | 360d883 | 2010-09-28 08:06:25 +0200 | [diff] [blame] | 115 | Starting with the release in October 2008, the names of the releases |
| 116 | were changed from numerical release numbers without deeper meaning |
| 117 | into a time stamp based numbering. Regular releases are identified by |
| 118 | names consisting of the calendar year and month of the release date. |
| 119 | Additional fields (if present) indicate release candidates or bug fix |
| 120 | releases in "stable" maintenance trees. |
wdenk | 93f19cc | 2002-12-17 17:55:09 +0000 | [diff] [blame] | 121 | |
Thomas Weber | 360d883 | 2010-09-28 08:06:25 +0200 | [diff] [blame] | 122 | Examples: |
Wolfgang Denk | c0f4085 | 2011-10-26 10:21:21 +0000 | [diff] [blame] | 123 | U-Boot v2009.11 - Release November 2009 |
Thomas Weber | 360d883 | 2010-09-28 08:06:25 +0200 | [diff] [blame] | 124 | U-Boot v2009.11.1 - Release 1 in version November 2009 stable tree |
Jelle van der Waa | 0de21ec | 2016-10-30 17:30:30 +0100 | [diff] [blame] | 125 | U-Boot v2010.09-rc1 - Release candidate 1 for September 2010 release |
wdenk | 93f19cc | 2002-12-17 17:55:09 +0000 | [diff] [blame] | 126 | |
| 127 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 128 | Directory Hierarchy: |
| 129 | ==================== |
| 130 | |
Simon Glass | 6e73ed0 | 2021-07-10 21:14:21 -0600 | [diff] [blame] | 131 | /arch Architecture-specific files |
Masahiro Yamada | 6eae68e | 2014-03-07 18:02:02 +0900 | [diff] [blame] | 132 | /arc Files generic to ARC architecture |
Peter Tyser | 8d321b8 | 2010-04-12 22:28:21 -0500 | [diff] [blame] | 133 | /arm Files generic to ARM architecture |
Peter Tyser | 8d321b8 | 2010-04-12 22:28:21 -0500 | [diff] [blame] | 134 | /m68k Files generic to m68k architecture |
Peter Tyser | 8d321b8 | 2010-04-12 22:28:21 -0500 | [diff] [blame] | 135 | /microblaze Files generic to microblaze architecture |
Peter Tyser | 8d321b8 | 2010-04-12 22:28:21 -0500 | [diff] [blame] | 136 | /mips Files generic to MIPS architecture |
Peter Tyser | 8d321b8 | 2010-04-12 22:28:21 -0500 | [diff] [blame] | 137 | /nios2 Files generic to Altera NIOS2 architecture |
Stefan Roese | a47a12b | 2010-04-15 16:07:28 +0200 | [diff] [blame] | 138 | /powerpc Files generic to PowerPC architecture |
Rick Chen | 3fafced | 2017-12-26 13:55:59 +0800 | [diff] [blame] | 139 | /riscv Files generic to RISC-V architecture |
Robert P. J. Day | 7207b36 | 2015-12-19 07:16:10 -0500 | [diff] [blame] | 140 | /sandbox Files generic to HW-independent "sandbox" |
Peter Tyser | 8d321b8 | 2010-04-12 22:28:21 -0500 | [diff] [blame] | 141 | /sh Files generic to SH architecture |
Robert P. J. Day | 33c7731 | 2013-09-15 18:34:15 -0400 | [diff] [blame] | 142 | /x86 Files generic to x86 architecture |
Naoki Hayama | e4eb313 | 2020-10-08 13:16:38 +0900 | [diff] [blame] | 143 | /xtensa Files generic to Xtensa architecture |
Simon Glass | 6e73ed0 | 2021-07-10 21:14:21 -0600 | [diff] [blame] | 144 | /api Machine/arch-independent API for external apps |
| 145 | /board Board-dependent files |
Simon Glass | 19a91f2 | 2021-10-14 12:47:54 -0600 | [diff] [blame] | 146 | /boot Support for images and booting |
Xu Ziyuan | 740f7e5 | 2016-08-26 19:54:49 +0800 | [diff] [blame] | 147 | /cmd U-Boot commands functions |
Simon Glass | 6e73ed0 | 2021-07-10 21:14:21 -0600 | [diff] [blame] | 148 | /common Misc architecture-independent functions |
Robert P. J. Day | 7207b36 | 2015-12-19 07:16:10 -0500 | [diff] [blame] | 149 | /configs Board default configuration files |
Peter Tyser | 8d321b8 | 2010-04-12 22:28:21 -0500 | [diff] [blame] | 150 | /disk Code for disk drive partition handling |
Simon Glass | 6e73ed0 | 2021-07-10 21:14:21 -0600 | [diff] [blame] | 151 | /doc Documentation (a mix of ReST and READMEs) |
| 152 | /drivers Device drivers |
| 153 | /dts Makefile for building internal U-Boot fdt. |
| 154 | /env Environment support |
Peter Tyser | 8d321b8 | 2010-04-12 22:28:21 -0500 | [diff] [blame] | 155 | /examples Example code for standalone applications, etc. |
| 156 | /fs Filesystem code (cramfs, ext2, jffs2, etc.) |
| 157 | /include Header Files |
Robert P. J. Day | 7207b36 | 2015-12-19 07:16:10 -0500 | [diff] [blame] | 158 | /lib Library routines generic to all architectures |
| 159 | /Licenses Various license files |
Peter Tyser | 8d321b8 | 2010-04-12 22:28:21 -0500 | [diff] [blame] | 160 | /net Networking code |
| 161 | /post Power On Self Test |
Robert P. J. Day | 7207b36 | 2015-12-19 07:16:10 -0500 | [diff] [blame] | 162 | /scripts Various build scripts and Makefiles |
| 163 | /test Various unit test files |
Simon Glass | 6e73ed0 | 2021-07-10 21:14:21 -0600 | [diff] [blame] | 164 | /tools Tools to build and sign FIT images, etc. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 165 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 166 | Software Configuration: |
| 167 | ======================= |
| 168 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 169 | Selection of Processor Architecture and Board Type: |
| 170 | --------------------------------------------------- |
| 171 | |
| 172 | For all supported boards there are ready-to-use default |
Holger Freyther | ab584d6 | 2014-08-04 09:26:05 +0200 | [diff] [blame] | 173 | configurations available; just type "make <board_name>_defconfig". |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 174 | |
| 175 | Example: For a TQM823L module type: |
| 176 | |
| 177 | cd u-boot |
Holger Freyther | ab584d6 | 2014-08-04 09:26:05 +0200 | [diff] [blame] | 178 | make TQM823L_defconfig |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 179 | |
Robert P. J. Day | 7207b36 | 2015-12-19 07:16:10 -0500 | [diff] [blame] | 180 | Note: If you're looking for the default configuration file for a board |
| 181 | you're sure used to be there but is now missing, check the file |
| 182 | doc/README.scrapyard for a list of no longer supported boards. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 183 | |
Simon Glass | 75b3c3a | 2014-03-22 17:12:59 -0600 | [diff] [blame] | 184 | Sandbox Environment: |
| 185 | -------------------- |
| 186 | |
| 187 | U-Boot can be built natively to run on a Linux host using the 'sandbox' |
| 188 | board. This allows feature development which is not board- or architecture- |
| 189 | specific to be undertaken on a native platform. The sandbox is also used to |
| 190 | run some of U-Boot's tests. |
| 191 | |
Naoki Hayama | bbb140e | 2020-10-08 13:16:58 +0900 | [diff] [blame] | 192 | See doc/arch/sandbox.rst for more details. |
Simon Glass | 75b3c3a | 2014-03-22 17:12:59 -0600 | [diff] [blame] | 193 | |
| 194 | |
Simon Glass | db91035 | 2015-03-03 08:03:00 -0700 | [diff] [blame] | 195 | Board Initialisation Flow: |
| 196 | -------------------------- |
| 197 | |
| 198 | This is the intended start-up flow for boards. This should apply for both |
Robert P. J. Day | 7207b36 | 2015-12-19 07:16:10 -0500 | [diff] [blame] | 199 | SPL and U-Boot proper (i.e. they both follow the same rules). |
Simon Glass | db91035 | 2015-03-03 08:03:00 -0700 | [diff] [blame] | 200 | |
Robert P. J. Day | 7207b36 | 2015-12-19 07:16:10 -0500 | [diff] [blame] | 201 | Note: "SPL" stands for "Secondary Program Loader," which is explained in |
| 202 | more detail later in this file. |
| 203 | |
| 204 | At present, SPL mostly uses a separate code path, but the function names |
| 205 | and roles of each function are the same. Some boards or architectures |
| 206 | may not conform to this. At least most ARM boards which use |
| 207 | CONFIG_SPL_FRAMEWORK conform to this. |
| 208 | |
| 209 | Execution typically starts with an architecture-specific (and possibly |
| 210 | CPU-specific) start.S file, such as: |
| 211 | |
| 212 | - arch/arm/cpu/armv7/start.S |
| 213 | - arch/powerpc/cpu/mpc83xx/start.S |
| 214 | - arch/mips/cpu/start.S |
| 215 | |
| 216 | and so on. From there, three functions are called; the purpose and |
| 217 | limitations of each of these functions are described below. |
Simon Glass | db91035 | 2015-03-03 08:03:00 -0700 | [diff] [blame] | 218 | |
| 219 | lowlevel_init(): |
| 220 | - purpose: essential init to permit execution to reach board_init_f() |
| 221 | - no global_data or BSS |
| 222 | - there is no stack (ARMv7 may have one but it will soon be removed) |
| 223 | - must not set up SDRAM or use console |
| 224 | - must only do the bare minimum to allow execution to continue to |
| 225 | board_init_f() |
| 226 | - this is almost never needed |
| 227 | - return normally from this function |
| 228 | |
| 229 | board_init_f(): |
| 230 | - purpose: set up the machine ready for running board_init_r(): |
| 231 | i.e. SDRAM and serial UART |
| 232 | - global_data is available |
| 233 | - stack is in SRAM |
| 234 | - BSS is not available, so you cannot use global/static variables, |
| 235 | only stack variables and global_data |
| 236 | |
| 237 | Non-SPL-specific notes: |
| 238 | - dram_init() is called to set up DRAM. If already done in SPL this |
| 239 | can do nothing |
| 240 | |
| 241 | SPL-specific notes: |
| 242 | - you can override the entire board_init_f() function with your own |
| 243 | version as needed. |
| 244 | - preloader_console_init() can be called here in extremis |
| 245 | - should set up SDRAM, and anything needed to make the UART work |
Naoki Hayama | 499696e | 2020-09-24 15:57:19 +0900 | [diff] [blame] | 246 | - there is no need to clear BSS, it will be done by crt0.S |
Andreas Dannenberg | 1425465 | 2019-08-08 12:54:49 -0500 | [diff] [blame] | 247 | - for specific scenarios on certain architectures an early BSS *can* |
| 248 | be made available (via CONFIG_SPL_EARLY_BSS by moving the clearing |
| 249 | of BSS prior to entering board_init_f()) but doing so is discouraged. |
| 250 | Instead it is strongly recommended to architect any code changes |
| 251 | or additions such to not depend on the availability of BSS during |
| 252 | board_init_f() as indicated in other sections of this README to |
| 253 | maintain compatibility and consistency across the entire code base. |
Simon Glass | db91035 | 2015-03-03 08:03:00 -0700 | [diff] [blame] | 254 | - must return normally from this function (don't call board_init_r() |
| 255 | directly) |
| 256 | |
| 257 | Here the BSS is cleared. For SPL, if CONFIG_SPL_STACK_R is defined, then at |
| 258 | this point the stack and global_data are relocated to below |
| 259 | CONFIG_SPL_STACK_R_ADDR. For non-SPL, U-Boot is relocated to run at the top of |
| 260 | memory. |
| 261 | |
| 262 | board_init_r(): |
| 263 | - purpose: main execution, common code |
| 264 | - global_data is available |
| 265 | - SDRAM is available |
| 266 | - BSS is available, all static/global variables can be used |
| 267 | - execution eventually continues to main_loop() |
| 268 | |
| 269 | Non-SPL-specific notes: |
| 270 | - U-Boot is relocated to the top of memory and is now running from |
| 271 | there. |
| 272 | |
| 273 | SPL-specific notes: |
| 274 | - stack is optionally in SDRAM, if CONFIG_SPL_STACK_R is defined and |
Ashish Kumar | 63b2316 | 2017-08-11 11:09:14 +0530 | [diff] [blame] | 275 | CONFIG_SYS_FSL_HAS_CCI400 |
| 276 | |
| 277 | Defined For SoC that has cache coherent interconnect |
| 278 | CCN-400 |
wdenk | 7f6c2cb | 2002-11-10 22:06:23 +0000 | [diff] [blame] | 279 | |
Ashish Kumar | c055cee | 2017-08-18 10:54:36 +0530 | [diff] [blame] | 280 | CONFIG_SYS_FSL_HAS_CCN504 |
| 281 | |
| 282 | Defined for SoC that has cache coherent interconnect CCN-504 |
| 283 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 284 | The following options need to be configured: |
| 285 | |
Kim Phillips | 2628114 | 2007-08-10 13:28:25 -0500 | [diff] [blame] | 286 | - CPU Type: Define exactly one, e.g. CONFIG_MPC85XX. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 287 | |
Kim Phillips | 2628114 | 2007-08-10 13:28:25 -0500 | [diff] [blame] | 288 | - Board Type: Define exactly one, e.g. CONFIG_MPC8540ADS. |
Wolfgang Denk | 6ccec44 | 2006-10-24 14:42:37 +0200 | [diff] [blame] | 289 | |
Kumar Gala | 66412c6 | 2011-02-18 05:40:54 -0600 | [diff] [blame] | 290 | - 85xx CPU Options: |
York Sun | ffd06e0 | 2012-10-08 07:44:30 +0000 | [diff] [blame] | 291 | CONFIG_SYS_PPC64 |
| 292 | |
| 293 | Specifies that the core is a 64-bit PowerPC implementation (implements |
| 294 | the "64" category of the Power ISA). This is necessary for ePAPR |
| 295 | compliance, among other possible reasons. |
| 296 | |
Scott Wood | 33eee33 | 2012-08-14 10:14:53 +0000 | [diff] [blame] | 297 | CONFIG_SYS_FSL_ERRATUM_A004510 |
| 298 | |
| 299 | Enables a workaround for erratum A004510. If set, |
| 300 | then CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV and |
Tom Rini | 6cc0454 | 2022-10-28 20:27:13 -0400 | [diff] [blame] | 301 | CFG_SYS_FSL_CORENET_SNOOPVEC_COREONLY must be set. |
Scott Wood | 33eee33 | 2012-08-14 10:14:53 +0000 | [diff] [blame] | 302 | |
| 303 | CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV |
| 304 | CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV2 (optional) |
| 305 | |
| 306 | Defines one or two SoC revisions (low 8 bits of SVR) |
| 307 | for which the A004510 workaround should be applied. |
| 308 | |
| 309 | The rest of SVR is either not relevant to the decision |
| 310 | of whether the erratum is present (e.g. p2040 versus |
| 311 | p2041) or is implied by the build target, which controls |
| 312 | whether CONFIG_SYS_FSL_ERRATUM_A004510 is set. |
| 313 | |
| 314 | See Freescale App Note 4493 for more information about |
| 315 | this erratum. |
| 316 | |
Tom Rini | 6cc0454 | 2022-10-28 20:27:13 -0400 | [diff] [blame] | 317 | CFG_SYS_FSL_CORENET_SNOOPVEC_COREONLY |
Scott Wood | 33eee33 | 2012-08-14 10:14:53 +0000 | [diff] [blame] | 318 | |
| 319 | This is the value to write into CCSR offset 0x18600 |
| 320 | according to the A004510 workaround. |
| 321 | |
Priyanka Jain | b135991 | 2013-12-17 14:25:52 +0530 | [diff] [blame] | 322 | CONFIG_SYS_FSL_SINGLE_SOURCE_CLK |
| 323 | Single Source Clock is clocking mode present in some of FSL SoC's. |
| 324 | In this mode, a single differential clock is used to supply |
| 325 | clocks to the sysclock, ddrclock and usbclock. |
| 326 | |
Daniel Schwierzeck | 6cb461b | 2012-04-02 02:57:56 +0000 | [diff] [blame] | 327 | - Generic CPU options: |
Daniel Schwierzeck | 6cb461b | 2012-04-02 02:57:56 +0000 | [diff] [blame] | 328 | |
York Sun | 5614e71 | 2013-09-30 09:22:09 -0700 | [diff] [blame] | 329 | CONFIG_SYS_FSL_DDR |
| 330 | Freescale DDR driver in use. This type of DDR controller is |
Tom Rini | 1c58857 | 2021-05-14 21:34:26 -0400 | [diff] [blame] | 331 | found in mpc83xx, mpc85xx as well as some ARM core SoCs. |
York Sun | 5614e71 | 2013-09-30 09:22:09 -0700 | [diff] [blame] | 332 | |
Tom Rini | 6cc0454 | 2022-10-28 20:27:13 -0400 | [diff] [blame] | 333 | CFG_SYS_FSL_DDR_ADDR |
York Sun | 5614e71 | 2013-09-30 09:22:09 -0700 | [diff] [blame] | 334 | Freescale DDR memory-mapped register base. |
| 335 | |
Prabhakar Kushwaha | 1c40707 | 2017-02-02 15:01:26 +0530 | [diff] [blame] | 336 | CONFIG_SYS_FSL_IFC_CLK_DIV |
| 337 | Defines divider of platform clock(clock input to IFC controller). |
| 338 | |
Prabhakar Kushwaha | add63f9 | 2017-02-02 15:02:00 +0530 | [diff] [blame] | 339 | CONFIG_SYS_FSL_LBC_CLK_DIV |
| 340 | Defines divider of platform clock(clock input to eLBC controller). |
| 341 | |
Tom Rini | 6cc0454 | 2022-10-28 20:27:13 -0400 | [diff] [blame] | 342 | CFG_SYS_FSL_DDR_SDRAM_BASE_PHY |
York Sun | 6b9e309 | 2014-02-10 13:59:43 -0800 | [diff] [blame] | 343 | Physical address from the view of DDR controllers. It is the |
| 344 | same as CONFIG_SYS_DDR_SDRAM_BASE for all Power SoCs. But |
| 345 | it could be different for ARM SoCs. |
| 346 | |
Daniel Schwierzeck | 92bbd64 | 2011-07-27 13:22:39 +0200 | [diff] [blame] | 347 | - MIPS CPU options: |
Daniel Schwierzeck | 92bbd64 | 2011-07-27 13:22:39 +0200 | [diff] [blame] | 348 | CONFIG_XWAY_SWAP_BYTES |
| 349 | |
| 350 | Enable compilation of tools/xway-swap-bytes needed for Lantiq |
| 351 | XWAY SoCs for booting from NOR flash. The U-Boot image needs to |
| 352 | be swapped if a flash programmer is used. |
| 353 | |
Christian Riesch | b67d881 | 2012-02-02 00:44:39 +0000 | [diff] [blame] | 354 | - ARM options: |
| 355 | CONFIG_SYS_EXCEPTION_VECTORS_HIGH |
| 356 | |
| 357 | Select high exception vectors of the ARM core, e.g., do not |
| 358 | clear the V bit of the c1 register of CP15. |
| 359 | |
York Sun | 207774b | 2015-03-20 19:28:08 -0700 | [diff] [blame] | 360 | COUNTER_FREQUENCY |
| 361 | Generic timer clock source frequency. |
| 362 | |
| 363 | COUNTER_FREQUENCY_REAL |
| 364 | Generic timer clock source frequency if the real clock is |
| 365 | different from COUNTER_FREQUENCY, and can only be determined |
| 366 | at run time. |
| 367 | |
Stephen Warren | 73c3893 | 2015-01-19 16:25:52 -0700 | [diff] [blame] | 368 | - Tegra SoC options: |
| 369 | CONFIG_TEGRA_SUPPORT_NON_SECURE |
| 370 | |
| 371 | Support executing U-Boot in non-secure (NS) mode. Certain |
| 372 | impossible actions will be skipped if the CPU is in NS mode, |
| 373 | such as ARM architectural timer initialization. |
| 374 | |
wdenk | 5da627a | 2003-10-09 20:09:04 +0000 | [diff] [blame] | 375 | - Linux Kernel Interface: |
wdenk | 5da627a | 2003-10-09 20:09:04 +0000 | [diff] [blame] | 376 | CONFIG_MEMSIZE_IN_BYTES [relevant for MIPS only] |
| 377 | |
Jeremiah Mahler | b445bbb | 2015-01-04 18:56:50 -0800 | [diff] [blame] | 378 | When transferring memsize parameter to Linux, some versions |
wdenk | 5da627a | 2003-10-09 20:09:04 +0000 | [diff] [blame] | 379 | expect it to be in bytes, others in MB. |
| 380 | Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes. |
| 381 | |
Gerald Van Baren | fec6d9e | 2008-06-03 20:34:45 -0400 | [diff] [blame] | 382 | CONFIG_OF_LIBFDT |
Wolfgang Denk | f57f70a | 2005-10-13 01:45:54 +0200 | [diff] [blame] | 383 | |
| 384 | New kernel versions are expecting firmware settings to be |
Gerald Van Baren | 213bf8c | 2007-03-31 12:23:51 -0400 | [diff] [blame] | 385 | passed using flattened device trees (based on open firmware |
| 386 | concepts). |
| 387 | |
| 388 | CONFIG_OF_LIBFDT |
| 389 | * New libfdt-based support |
| 390 | * Adds the "fdt" command |
Kim Phillips | 3bb342f | 2007-08-10 14:34:14 -0500 | [diff] [blame] | 391 | * The bootm command automatically updates the fdt |
Gerald Van Baren | 213bf8c | 2007-03-31 12:23:51 -0400 | [diff] [blame] | 392 | |
Wolfgang Denk | f57f70a | 2005-10-13 01:45:54 +0200 | [diff] [blame] | 393 | OF_TBCLK - The timebase frequency. |
| 394 | |
Marcel Ziswiler | 11ccc33 | 2008-07-09 08:17:15 +0200 | [diff] [blame] | 395 | boards with QUICC Engines require OF_QE to set UCC MAC |
| 396 | addresses |
Kim Phillips | 3bb342f | 2007-08-10 14:34:14 -0500 | [diff] [blame] | 397 | |
Heiko Schocher | 3887c3f | 2009-09-23 07:56:08 +0200 | [diff] [blame] | 398 | CONFIG_OF_IDE_FIXUP |
| 399 | |
| 400 | U-Boot can detect if an IDE device is present or not. |
| 401 | If not, and this new config option is activated, U-Boot |
| 402 | removes the ATA node from the DTS before booting Linux, |
| 403 | so the Linux IDE driver does not probe the device and |
| 404 | crash. This is needed for buggy hardware (uc101) where |
| 405 | no pull down resistor is connected to the signal IDE5V_DD7. |
| 406 | |
Niklaus Giger | 0b2f4ec | 2008-11-03 22:13:47 +0100 | [diff] [blame] | 407 | - vxWorks boot parameters: |
| 408 | |
| 409 | bootvx constructs a valid bootline using the following |
Bin Meng | 9e98b7e | 2015-10-07 20:19:17 -0700 | [diff] [blame] | 410 | environments variables: bootdev, bootfile, ipaddr, netmask, |
| 411 | serverip, gatewayip, hostname, othbootargs. |
Niklaus Giger | 0b2f4ec | 2008-11-03 22:13:47 +0100 | [diff] [blame] | 412 | It loads the vxWorks image pointed bootfile. |
| 413 | |
Naoki Hayama | 81a05d9 | 2020-10-08 13:17:08 +0900 | [diff] [blame] | 414 | Note: If a "bootargs" environment is defined, it will override |
Niklaus Giger | 0b2f4ec | 2008-11-03 22:13:47 +0100 | [diff] [blame] | 415 | the defaults discussed just above. |
| 416 | |
Aneesh V | 93bc219 | 2011-06-16 23:30:51 +0000 | [diff] [blame] | 417 | - Cache Configuration for ARM: |
Aneesh V | 93bc219 | 2011-06-16 23:30:51 +0000 | [diff] [blame] | 418 | CONFIG_SYS_PL310_BASE - Physical base address of PL310 |
| 419 | controller register space |
| 420 | |
wdenk | 6705d81 | 2004-08-02 23:22:59 +0000 | [diff] [blame] | 421 | - Serial Ports: |
wdenk | 6705d81 | 2004-08-02 23:22:59 +0000 | [diff] [blame] | 422 | CONFIG_PL011_CLOCK |
| 423 | |
| 424 | If you have Amba PrimeCell PL011 UARTs, set this variable to |
| 425 | the clock speed of the UARTs. |
| 426 | |
| 427 | CONFIG_PL01x_PORTS |
| 428 | |
| 429 | If you have Amba PrimeCell PL010 or PL011 UARTs on your board, |
| 430 | define this to a list of base addresses for each (supported) |
| 431 | port. See e.g. include/configs/versatile.h |
| 432 | |
Karicheri, Muralidharan | d57dee5 | 2014-04-09 15:38:46 -0400 | [diff] [blame] | 433 | CONFIG_SERIAL_HW_FLOW_CONTROL |
| 434 | |
| 435 | Define this variable to enable hw flow control in serial driver. |
| 436 | Current user of this option is drivers/serial/nsl16550.c driver |
wdenk | 6705d81 | 2004-08-02 23:22:59 +0000 | [diff] [blame] | 437 | |
Simon Glass | 302a648 | 2016-03-13 19:07:28 -0600 | [diff] [blame] | 438 | - Removal of commands |
| 439 | If no commands are needed to boot, you can disable |
| 440 | CONFIG_CMDLINE to remove them. In this case, the command line |
| 441 | will not be available, and when U-Boot wants to execute the |
| 442 | boot command (on start-up) it will call board_run_command() |
| 443 | instead. This can reduce image size significantly for very |
| 444 | simple boot procedures. |
| 445 | |
Wolfgang Denk | a5ecbe6 | 2013-03-23 23:50:31 +0000 | [diff] [blame] | 446 | - Regular expression support: |
| 447 | CONFIG_REGEX |
Wolfgang Denk | 93e1459 | 2013-10-04 17:43:24 +0200 | [diff] [blame] | 448 | If this variable is defined, U-Boot is linked against |
| 449 | the SLRE (Super Light Regular Expression) library, |
| 450 | which adds regex support to some commands, as for |
| 451 | example "env grep" and "setexpr". |
Wolfgang Denk | a5ecbe6 | 2013-03-23 23:50:31 +0000 | [diff] [blame] | 452 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 453 | - Watchdog: |
Rasmus Villemoes | 933ada5 | 2021-04-14 09:18:22 +0200 | [diff] [blame] | 454 | CONFIG_SYS_WATCHDOG_FREQ |
| 455 | Some platforms automatically call WATCHDOG_RESET() |
| 456 | from the timer interrupt handler every |
| 457 | CONFIG_SYS_WATCHDOG_FREQ interrupts. If not set by the |
| 458 | board configuration file, a default of CONFIG_SYS_HZ/2 |
| 459 | (i.e. 500) is used. Setting CONFIG_SYS_WATCHDOG_FREQ |
| 460 | to 0 disables calling WATCHDOG_RESET() from the timer |
| 461 | interrupt. |
| 462 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 463 | - Real-Time Clock: |
| 464 | |
Jon Loeliger | 602ad3b | 2007-06-11 19:03:39 -0500 | [diff] [blame] | 465 | When CONFIG_CMD_DATE is selected, the type of the RTC |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 466 | has to be selected, too. Define exactly one of the |
| 467 | following options: |
| 468 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 469 | CONFIG_RTC_PCF8563 - use Philips PCF8563 RTC |
Fabio Estevam | 4e8b754 | 2011-10-24 06:44:15 +0000 | [diff] [blame] | 470 | CONFIG_RTC_MC13XXX - use MC13783 or MC13892 RTC |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 471 | CONFIG_RTC_MC146818 - use MC146818 RTC |
wdenk | 1cb8e98 | 2003-03-06 21:55:29 +0000 | [diff] [blame] | 472 | CONFIG_RTC_DS1307 - use Maxim, Inc. DS1307 RTC |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 473 | CONFIG_RTC_DS1337 - use Maxim, Inc. DS1337 RTC |
wdenk | 7f70e85 | 2003-05-20 14:25:27 +0000 | [diff] [blame] | 474 | CONFIG_RTC_DS1338 - use Maxim, Inc. DS1338 RTC |
Markus Niebel | 412921d | 2014-07-21 11:06:16 +0200 | [diff] [blame] | 475 | CONFIG_RTC_DS1339 - use Maxim, Inc. DS1339 RTC |
wdenk | 3bac351 | 2003-03-12 10:41:04 +0000 | [diff] [blame] | 476 | CONFIG_RTC_DS164x - use Dallas DS164x RTC |
Tor Krill | 9536dfc | 2008-03-15 15:40:26 +0100 | [diff] [blame] | 477 | CONFIG_RTC_ISL1208 - use Intersil ISL1208 RTC |
wdenk | 4c0d4c3 | 2004-06-09 17:34:58 +0000 | [diff] [blame] | 478 | CONFIG_RTC_MAX6900 - use Maxim, Inc. MAX6900 RTC |
Chris Packham | 2bd3cab | 2017-05-30 12:03:33 +1200 | [diff] [blame] | 479 | CONFIG_RTC_DS1337_NOOSC - Turn off the OSC output for DS1337 |
Heiko Schocher | 71d19f3 | 2011-03-28 09:24:22 +0200 | [diff] [blame] | 480 | CONFIG_SYS_RV3029_TCR - enable trickle charger on |
| 481 | RV3029 RTC. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 482 | |
wdenk | b37c7e5 | 2003-06-30 16:24:52 +0000 | [diff] [blame] | 483 | Note that if the RTC uses I2C, then the I2C interface |
| 484 | must also be configured. See I2C Support, below. |
| 485 | |
Peter Tyser | e92739d | 2008-12-17 16:36:21 -0600 | [diff] [blame] | 486 | - GPIO Support: |
| 487 | CONFIG_PCA953X - use NXP's PCA953X series I2C GPIO |
Peter Tyser | e92739d | 2008-12-17 16:36:21 -0600 | [diff] [blame] | 488 | |
Chris Packham | 5dec49c | 2010-12-19 10:12:13 +0000 | [diff] [blame] | 489 | The CONFIG_SYS_I2C_PCA953X_WIDTH option specifies a list of |
| 490 | chip-ngpio pairs that tell the PCA953X driver the number of |
| 491 | pins supported by a particular chip. |
| 492 | |
Peter Tyser | e92739d | 2008-12-17 16:36:21 -0600 | [diff] [blame] | 493 | Note that if the GPIO device uses I2C, then the I2C interface |
| 494 | must also be configured. See I2C Support, below. |
| 495 | |
Simon Glass | aa53233 | 2014-06-11 23:29:41 -0600 | [diff] [blame] | 496 | - I/O tracing: |
| 497 | When CONFIG_IO_TRACE is selected, U-Boot intercepts all I/O |
| 498 | accesses and can checksum them or write a list of them out |
| 499 | to memory. See the 'iotrace' command for details. This is |
| 500 | useful for testing device drivers since it can confirm that |
| 501 | the driver behaves the same way before and after a code |
| 502 | change. Currently this is supported on sandbox and arm. To |
| 503 | add support for your architecture, add '#include <iotrace.h>' |
| 504 | to the bottom of arch/<arch>/include/asm/io.h and test. |
| 505 | |
| 506 | Example output from the 'iotrace stats' command is below. |
| 507 | Note that if the trace buffer is exhausted, the checksum will |
| 508 | still continue to operate. |
| 509 | |
| 510 | iotrace is enabled |
| 511 | Start: 10000000 (buffer start address) |
| 512 | Size: 00010000 (buffer size) |
| 513 | Offset: 00000120 (current buffer offset) |
| 514 | Output: 10000120 (start + offset) |
| 515 | Count: 00000018 (number of trace records) |
| 516 | CRC32: 9526fb66 (CRC32 of all trace records) |
| 517 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 518 | - Timestamp Support: |
| 519 | |
wdenk | 43d9616 | 2003-03-06 00:02:04 +0000 | [diff] [blame] | 520 | When CONFIG_TIMESTAMP is selected, the timestamp |
| 521 | (date and time) of an image is printed by image |
| 522 | commands like bootm or iminfo. This option is |
Jon Loeliger | 602ad3b | 2007-06-11 19:03:39 -0500 | [diff] [blame] | 523 | automatically enabled when you select CONFIG_CMD_DATE . |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 524 | |
Karl O. Pinc | 923c46f | 2012-08-16 06:20:15 +0000 | [diff] [blame] | 525 | - Partition Labels (disklabels) Supported: |
| 526 | Zero or more of the following: |
| 527 | CONFIG_MAC_PARTITION Apple's MacOS partition table. |
Karl O. Pinc | 923c46f | 2012-08-16 06:20:15 +0000 | [diff] [blame] | 528 | CONFIG_ISO_PARTITION ISO partition table, used on CDROM etc. |
| 529 | CONFIG_EFI_PARTITION GPT partition table, common when EFI is the |
| 530 | bootloader. Note 2TB partition limit; see |
| 531 | disk/part_efi.c |
Simon Glass | c649e3c | 2016-05-01 11:36:02 -0600 | [diff] [blame] | 532 | CONFIG_SCSI) you must configure support for at |
Karl O. Pinc | 923c46f | 2012-08-16 06:20:15 +0000 | [diff] [blame] | 533 | least one non-MTD partition type as well. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 534 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 535 | - NETWORK Support (PCI): |
Kyle Moffett | ce5207e | 2011-10-18 11:05:29 +0000 | [diff] [blame] | 536 | CONFIG_E1000_SPI |
| 537 | Utility code for direct access to the SPI bus on Intel 8257x. |
| 538 | This does not do anything useful unless you set at least one |
| 539 | of CONFIG_CMD_E1000 or CONFIG_E1000_SPI_GENERIC. |
| 540 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 541 | CONFIG_NATSEMI |
| 542 | Support for National dp83815 chips. |
| 543 | |
| 544 | CONFIG_NS8382X |
| 545 | Support for National dp8382[01] gigabit chips. |
| 546 | |
wdenk | 45219c4 | 2003-05-12 21:50:16 +0000 | [diff] [blame] | 547 | - NETWORK Support (other): |
Rob Herring | efdd731 | 2011-12-15 11:15:49 +0000 | [diff] [blame] | 548 | CONFIG_CALXEDA_XGMAC |
| 549 | Support for the Calxeda XGMAC device |
| 550 | |
Ashok | 3bb46d2 | 2012-10-15 06:20:47 +0000 | [diff] [blame] | 551 | CONFIG_LAN91C96 |
wdenk | 45219c4 | 2003-05-12 21:50:16 +0000 | [diff] [blame] | 552 | Support for SMSC's LAN91C96 chips. |
| 553 | |
wdenk | 45219c4 | 2003-05-12 21:50:16 +0000 | [diff] [blame] | 554 | CONFIG_LAN91C96_USE_32_BIT |
| 555 | Define this to enable 32 bit addressing |
| 556 | |
Heiko Schocher | dc02bad | 2011-11-15 10:00:04 -0500 | [diff] [blame] | 557 | CONFIG_SYS_DAVINCI_EMAC_PHY_COUNT |
| 558 | Define this if you have more then 3 PHYs. |
| 559 | |
Macpaul Lin | b3dbf4a5 | 2010-12-21 16:59:46 +0800 | [diff] [blame] | 560 | CONFIG_FTGMAC100 |
| 561 | Support for Faraday's FTGMAC100 Gigabit SoC Ethernet |
| 562 | |
| 563 | CONFIG_FTGMAC100_EGIGA |
| 564 | Define this to use GE link update with gigabit PHY. |
| 565 | Define this if FTGMAC100 is connected to gigabit PHY. |
| 566 | If your system has 10/100 PHY only, it might not occur |
| 567 | wrong behavior. Because PHY usually return timeout or |
| 568 | useless data when polling gigabit status and gigabit |
| 569 | control registers. This behavior won't affect the |
| 570 | correctnessof 10/100 link speed update. |
| 571 | |
Yoshihiro Shimoda | 3d0075f | 2011-01-27 10:06:03 +0900 | [diff] [blame] | 572 | CONFIG_SH_ETHER |
| 573 | Support for Renesas on-chip Ethernet controller |
| 574 | |
| 575 | CONFIG_SH_ETHER_USE_PORT |
| 576 | Define the number of ports to be used |
| 577 | |
| 578 | CONFIG_SH_ETHER_PHY_ADDR |
| 579 | Define the ETH PHY's address |
| 580 | |
Yoshihiro Shimoda | 68260aa | 2011-01-27 10:06:08 +0900 | [diff] [blame] | 581 | CONFIG_SH_ETHER_CACHE_WRITEBACK |
| 582 | If this option is set, the driver enables cache flush. |
| 583 | |
Vadim Bendebury | 5e12472 | 2011-10-17 08:36:14 +0000 | [diff] [blame] | 584 | - TPM Support: |
Che-liang Chiou | 90899cc | 2013-04-12 11:04:34 +0000 | [diff] [blame] | 585 | CONFIG_TPM |
| 586 | Support TPM devices. |
| 587 | |
Christophe Ricard | 0766ad2 | 2015-10-06 22:54:41 +0200 | [diff] [blame] | 588 | CONFIG_TPM_TIS_INFINEON |
| 589 | Support for Infineon i2c bus TPM devices. Only one device |
Tom Wai-Hong Tam | 1b393db | 2013-04-12 11:04:37 +0000 | [diff] [blame] | 590 | per system is supported at this time. |
| 591 | |
Tom Wai-Hong Tam | 1b393db | 2013-04-12 11:04:37 +0000 | [diff] [blame] | 592 | CONFIG_TPM_TIS_I2C_BURST_LIMITATION |
| 593 | Define the burst count bytes upper limit |
| 594 | |
Christophe Ricard | 3aa7408 | 2016-01-21 23:27:13 +0100 | [diff] [blame] | 595 | CONFIG_TPM_ST33ZP24 |
| 596 | Support for STMicroelectronics TPM devices. Requires DM_TPM support. |
| 597 | |
| 598 | CONFIG_TPM_ST33ZP24_I2C |
| 599 | Support for STMicroelectronics ST33ZP24 I2C devices. |
| 600 | Requires TPM_ST33ZP24 and I2C. |
| 601 | |
Christophe Ricard | b75fdc1 | 2016-01-21 23:27:14 +0100 | [diff] [blame] | 602 | CONFIG_TPM_ST33ZP24_SPI |
| 603 | Support for STMicroelectronics ST33ZP24 SPI devices. |
| 604 | Requires TPM_ST33ZP24 and SPI. |
| 605 | |
Dirk Eibach | c01939c | 2013-06-26 15:55:15 +0200 | [diff] [blame] | 606 | CONFIG_TPM_ATMEL_TWI |
| 607 | Support for Atmel TWI TPM device. Requires I2C support. |
| 608 | |
Che-liang Chiou | 90899cc | 2013-04-12 11:04:34 +0000 | [diff] [blame] | 609 | CONFIG_TPM_TIS_LPC |
Vadim Bendebury | 5e12472 | 2011-10-17 08:36:14 +0000 | [diff] [blame] | 610 | Support for generic parallel port TPM devices. Only one device |
| 611 | per system is supported at this time. |
| 612 | |
| 613 | CONFIG_TPM_TIS_BASE_ADDRESS |
| 614 | Base address where the generic TPM device is mapped |
| 615 | to. Contemporary x86 systems usually map it at |
| 616 | 0xfed40000. |
| 617 | |
Reinhard Pfau | be6c152 | 2013-06-26 15:55:13 +0200 | [diff] [blame] | 618 | CONFIG_TPM |
| 619 | Define this to enable the TPM support library which provides |
| 620 | functional interfaces to some TPM commands. |
| 621 | Requires support for a TPM device. |
| 622 | |
| 623 | CONFIG_TPM_AUTH_SESSIONS |
| 624 | Define this to enable authorized functions in the TPM library. |
| 625 | Requires CONFIG_TPM and CONFIG_SHA1. |
| 626 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 627 | - USB Support: |
| 628 | At the moment only the UHCI host controller is |
Heiko Schocher | 064b55c | 2017-06-14 05:49:40 +0200 | [diff] [blame] | 629 | supported (PIP405, MIP405); define |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 630 | CONFIG_USB_UHCI to enable it. |
| 631 | define CONFIG_USB_KEYBOARD to enable the USB Keyboard |
wdenk | 30d56fa | 2004-10-09 22:44:59 +0000 | [diff] [blame] | 632 | and define CONFIG_USB_STORAGE to enable the USB |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 633 | storage devices. |
| 634 | Note: |
| 635 | Supported are USB Keyboards and USB Floppy drives |
| 636 | (TEAC FD-05PUB). |
wdenk | 4d13cba | 2004-03-14 14:09:05 +0000 | [diff] [blame] | 637 | |
Oleksandr Tymoshenko | 6e9e062 | 2014-02-01 21:51:25 -0700 | [diff] [blame] | 638 | CONFIG_USB_DWC2_REG_ADDR the physical CPU address of the DWC2 |
| 639 | HW module registers. |
| 640 | |
Wolfgang Denk | 16c8d5e | 2006-06-14 17:45:53 +0200 | [diff] [blame] | 641 | - USB Device: |
| 642 | Define the below if you wish to use the USB console. |
| 643 | Once firmware is rebuilt from a serial console issue the |
| 644 | command "setenv stdin usbtty; setenv stdout usbtty" and |
Marcel Ziswiler | 11ccc33 | 2008-07-09 08:17:15 +0200 | [diff] [blame] | 645 | attach your USB cable. The Unix command "dmesg" should print |
Wolfgang Denk | 16c8d5e | 2006-06-14 17:45:53 +0200 | [diff] [blame] | 646 | it has found a new device. The environment variable usbtty |
| 647 | can be set to gserial or cdc_acm to enable your device to |
Wolfgang Denk | 386eda0 | 2006-06-14 18:14:56 +0200 | [diff] [blame] | 648 | appear to a USB host as a Linux gserial device or a |
Wolfgang Denk | 16c8d5e | 2006-06-14 17:45:53 +0200 | [diff] [blame] | 649 | Common Device Class Abstract Control Model serial device. |
| 650 | If you select usbtty = gserial you should be able to enumerate |
| 651 | a Linux host by |
| 652 | # modprobe usbserial vendor=0xVendorID product=0xProductID |
| 653 | else if using cdc_acm, simply setting the environment |
| 654 | variable usbtty to be cdc_acm should suffice. The following |
| 655 | might be defined in YourBoardName.h |
Wolfgang Denk | 386eda0 | 2006-06-14 18:14:56 +0200 | [diff] [blame] | 656 | |
Wolfgang Denk | 16c8d5e | 2006-06-14 17:45:53 +0200 | [diff] [blame] | 657 | CONFIG_USB_DEVICE |
| 658 | Define this to build a UDC device |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 659 | |
Wolfgang Denk | 16c8d5e | 2006-06-14 17:45:53 +0200 | [diff] [blame] | 660 | CONFIG_USB_TTY |
| 661 | Define this to have a tty type of device available to |
| 662 | talk to the UDC device |
Wolfgang Denk | 386eda0 | 2006-06-14 18:14:56 +0200 | [diff] [blame] | 663 | |
Vipin KUMAR | f9da0f8 | 2012-03-26 15:38:06 +0530 | [diff] [blame] | 664 | CONFIG_USBD_HS |
| 665 | Define this to enable the high speed support for usb |
| 666 | device and usbtty. If this feature is enabled, a routine |
| 667 | int is_usbd_high_speed(void) |
| 668 | also needs to be defined by the driver to dynamically poll |
| 669 | whether the enumeration has succeded at high speed or full |
| 670 | speed. |
| 671 | |
Wolfgang Denk | 386eda0 | 2006-06-14 18:14:56 +0200 | [diff] [blame] | 672 | If you have a USB-IF assigned VendorID then you may wish to |
Wolfgang Denk | 16c8d5e | 2006-06-14 17:45:53 +0200 | [diff] [blame] | 673 | define your own vendor specific values either in BoardName.h |
Wolfgang Denk | 386eda0 | 2006-06-14 18:14:56 +0200 | [diff] [blame] | 674 | or directly in usbd_vendor_info.h. If you don't define |
Wolfgang Denk | 16c8d5e | 2006-06-14 17:45:53 +0200 | [diff] [blame] | 675 | CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME, |
| 676 | CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot |
| 677 | should pretend to be a Linux device to it's target host. |
| 678 | |
| 679 | CONFIG_USBD_MANUFACTURER |
| 680 | Define this string as the name of your company for |
| 681 | - CONFIG_USBD_MANUFACTURER "my company" |
Wolfgang Denk | 386eda0 | 2006-06-14 18:14:56 +0200 | [diff] [blame] | 682 | |
Wolfgang Denk | 16c8d5e | 2006-06-14 17:45:53 +0200 | [diff] [blame] | 683 | CONFIG_USBD_PRODUCT_NAME |
| 684 | Define this string as the name of your product |
| 685 | - CONFIG_USBD_PRODUCT_NAME "acme usb device" |
| 686 | |
| 687 | CONFIG_USBD_VENDORID |
| 688 | Define this as your assigned Vendor ID from the USB |
| 689 | Implementors Forum. This *must* be a genuine Vendor ID |
| 690 | to avoid polluting the USB namespace. |
| 691 | - CONFIG_USBD_VENDORID 0xFFFF |
Wolfgang Denk | 386eda0 | 2006-06-14 18:14:56 +0200 | [diff] [blame] | 692 | |
Wolfgang Denk | 16c8d5e | 2006-06-14 17:45:53 +0200 | [diff] [blame] | 693 | CONFIG_USBD_PRODUCTID |
| 694 | Define this as the unique Product ID |
| 695 | for your device |
| 696 | - CONFIG_USBD_PRODUCTID 0xFFFF |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 697 | |
Igor Grinberg | d70a560 | 2011-12-12 12:08:35 +0200 | [diff] [blame] | 698 | - ULPI Layer Support: |
| 699 | The ULPI (UTMI Low Pin (count) Interface) PHYs are supported via |
| 700 | the generic ULPI layer. The generic layer accesses the ULPI PHY |
| 701 | via the platform viewport, so you need both the genric layer and |
| 702 | the viewport enabled. Currently only Chipidea/ARC based |
| 703 | viewport is supported. |
| 704 | To enable the ULPI layer support, define CONFIG_USB_ULPI and |
| 705 | CONFIG_USB_ULPI_VIEWPORT in your board configuration file. |
Lucas Stach | 6d365ea | 2012-10-01 00:44:35 +0200 | [diff] [blame] | 706 | If your ULPI phy needs a different reference clock than the |
| 707 | standard 24 MHz then you have to define CONFIG_ULPI_REF_CLK to |
| 708 | the appropriate value in Hz. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 709 | |
| 710 | - MMC Support: |
Yoshihiro Shimoda | afb3566 | 2011-07-04 22:21:22 +0000 | [diff] [blame] | 711 | CONFIG_SH_MMCIF |
| 712 | Support for Renesas on-chip MMCIF controller |
| 713 | |
| 714 | CONFIG_SH_MMCIF_ADDR |
| 715 | Define the base address of MMCIF registers |
| 716 | |
| 717 | CONFIG_SH_MMCIF_CLK |
| 718 | Define the clock frequency for MMCIF |
| 719 | |
Tom Rini | b3ba6e9 | 2013-03-14 05:32:47 +0000 | [diff] [blame] | 720 | - USB Device Firmware Update (DFU) class support: |
Marek Vasut | bb4059a | 2018-02-16 16:41:18 +0100 | [diff] [blame] | 721 | CONFIG_DFU_OVER_USB |
Tom Rini | b3ba6e9 | 2013-03-14 05:32:47 +0000 | [diff] [blame] | 722 | This enables the USB portion of the DFU USB class |
| 723 | |
Pantelis Antoniou | c663176 | 2013-03-14 05:32:52 +0000 | [diff] [blame] | 724 | CONFIG_DFU_NAND |
| 725 | This enables support for exposing NAND devices via DFU. |
| 726 | |
Afzal Mohammed | a9479f0 | 2013-09-18 01:15:24 +0530 | [diff] [blame] | 727 | CONFIG_DFU_RAM |
| 728 | This enables support for exposing RAM via DFU. |
| 729 | Note: DFU spec refer to non-volatile memory usage, but |
| 730 | allow usages beyond the scope of spec - here RAM usage, |
| 731 | one that would help mostly the developer. |
| 732 | |
Heiko Schocher | e7e75c7 | 2013-06-12 06:05:51 +0200 | [diff] [blame] | 733 | CONFIG_SYS_DFU_DATA_BUF_SIZE |
| 734 | Dfu transfer uses a buffer before writing data to the |
| 735 | raw storage device. Make the size (in bytes) of this buffer |
| 736 | configurable. The size of this buffer is also configurable |
| 737 | through the "dfu_bufsiz" environment variable. |
| 738 | |
Pantelis Antoniou | ea2453d | 2013-03-14 05:32:48 +0000 | [diff] [blame] | 739 | CONFIG_SYS_DFU_MAX_FILE_SIZE |
| 740 | When updating files rather than the raw storage device, |
| 741 | we use a static buffer to copy the file into and then write |
| 742 | the buffer once we've been given the whole file. Define |
| 743 | this to the maximum filesize (in bytes) for the buffer. |
| 744 | Default is 4 MiB if undefined. |
| 745 | |
Heiko Schocher | 001a831 | 2014-03-18 08:09:56 +0100 | [diff] [blame] | 746 | DFU_DEFAULT_POLL_TIMEOUT |
| 747 | Poll timeout [ms], is the timeout a device can send to the |
| 748 | host. The host must wait for this timeout before sending |
| 749 | a subsequent DFU_GET_STATUS request to the device. |
| 750 | |
| 751 | DFU_MANIFEST_POLL_TIMEOUT |
| 752 | Poll timeout [ms], which the device sends to the host when |
| 753 | entering dfuMANIFEST state. Host waits this timeout, before |
| 754 | sending again an USB request to the device. |
| 755 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 756 | - Keyboard Support: |
Simon Glass | 39f615e | 2015-11-11 10:05:47 -0700 | [diff] [blame] | 757 | See Kconfig help for available keyboard drivers. |
| 758 | |
wdenk | 17ea117 | 2004-06-06 21:51:03 +0000 | [diff] [blame] | 759 | - MII/PHY support: |
wdenk | 17ea117 | 2004-06-06 21:51:03 +0000 | [diff] [blame] | 760 | CONFIG_PHY_CLOCK_FREQ (ppc4xx) |
| 761 | |
| 762 | The clock frequency of the MII bus |
| 763 | |
wdenk | 17ea117 | 2004-06-06 21:51:03 +0000 | [diff] [blame] | 764 | CONFIG_PHY_CMD_DELAY (ppc4xx) |
| 765 | |
| 766 | Some PHY like Intel LXT971A need extra delay after |
| 767 | command issued before MII status register can be read |
| 768 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 769 | - IP address: |
| 770 | CONFIG_IPADDR |
| 771 | |
| 772 | Define a default value for the IP address to use for |
Marcel Ziswiler | 11ccc33 | 2008-07-09 08:17:15 +0200 | [diff] [blame] | 773 | the default Ethernet interface, in case this is not |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 774 | determined through e.g. bootp. |
Wolfgang Denk | 1ebcd65 | 2011-10-26 10:21:22 +0000 | [diff] [blame] | 775 | (Environment variable "ipaddr") |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 776 | |
| 777 | - Server IP address: |
| 778 | CONFIG_SERVERIP |
| 779 | |
Marcel Ziswiler | 11ccc33 | 2008-07-09 08:17:15 +0200 | [diff] [blame] | 780 | Defines a default value for the IP address of a TFTP |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 781 | server to contact when using the "tftboot" command. |
Wolfgang Denk | 1ebcd65 | 2011-10-26 10:21:22 +0000 | [diff] [blame] | 782 | (Environment variable "serverip") |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 783 | |
Wolfgang Denk | 1ebcd65 | 2011-10-26 10:21:22 +0000 | [diff] [blame] | 784 | - Gateway IP address: |
| 785 | CONFIG_GATEWAYIP |
| 786 | |
| 787 | Defines a default value for the IP address of the |
| 788 | default router where packets to other networks are |
| 789 | sent to. |
| 790 | (Environment variable "gatewayip") |
| 791 | |
| 792 | - Subnet mask: |
| 793 | CONFIG_NETMASK |
| 794 | |
| 795 | Defines a default value for the subnet mask (or |
| 796 | routing prefix) which is used to determine if an IP |
| 797 | address belongs to the local subnet or needs to be |
| 798 | forwarded through a router. |
| 799 | (Environment variable "netmask") |
| 800 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 801 | - BOOTP Recovery Mode: |
| 802 | CONFIG_BOOTP_RANDOM_DELAY |
| 803 | |
| 804 | If you have many targets in a network that try to |
| 805 | boot using BOOTP, you may want to avoid that all |
| 806 | systems send out BOOTP requests at precisely the same |
| 807 | moment (which would happen for instance at recovery |
| 808 | from a power failure, when all systems will try to |
| 809 | boot, thus flooding the BOOTP server. Defining |
| 810 | CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be |
| 811 | inserted before sending out BOOTP requests. The |
Wolfgang Denk | 6c33c78 | 2007-08-06 23:21:05 +0200 | [diff] [blame] | 812 | following delays are inserted then: |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 813 | |
| 814 | 1st BOOTP request: delay 0 ... 1 sec |
| 815 | 2nd BOOTP request: delay 0 ... 2 sec |
| 816 | 3rd BOOTP request: delay 0 ... 4 sec |
| 817 | 4th and following |
| 818 | BOOTP requests: delay 0 ... 8 sec |
| 819 | |
Thierry Reding | 92ac8ac | 2014-08-19 10:21:24 +0200 | [diff] [blame] | 820 | CONFIG_BOOTP_ID_CACHE_SIZE |
| 821 | |
| 822 | BOOTP packets are uniquely identified using a 32-bit ID. The |
| 823 | server will copy the ID from client requests to responses and |
| 824 | U-Boot will use this to determine if it is the destination of |
| 825 | an incoming response. Some servers will check that addresses |
| 826 | aren't in use before handing them out (usually using an ARP |
| 827 | ping) and therefore take up to a few hundred milliseconds to |
| 828 | respond. Network congestion may also influence the time it |
| 829 | takes for a response to make it back to the client. If that |
| 830 | time is too long, U-Boot will retransmit requests. In order |
| 831 | to allow earlier responses to still be accepted after these |
| 832 | retransmissions, U-Boot's BOOTP client keeps a small cache of |
| 833 | IDs. The CONFIG_BOOTP_ID_CACHE_SIZE controls the size of this |
| 834 | cache. The default is to keep IDs for up to four outstanding |
| 835 | requests. Increasing this will allow U-Boot to accept offers |
| 836 | from a BOOTP client in networks with unusually high latency. |
| 837 | |
stroese | fe389a8 | 2003-08-28 14:17:32 +0000 | [diff] [blame] | 838 | - DHCP Advanced Options: |
Joe Hershberger | 2c00e09 | 2012-05-23 07:59:19 +0000 | [diff] [blame] | 839 | |
Joe Hershberger | d22c338 | 2012-05-23 08:00:12 +0000 | [diff] [blame] | 840 | - Link-local IP address negotiation: |
| 841 | Negotiate with other link-local clients on the local network |
| 842 | for an address that doesn't require explicit configuration. |
| 843 | This is especially useful if a DHCP server cannot be guaranteed |
| 844 | to exist in all environments that the device must operate. |
| 845 | |
| 846 | See doc/README.link-local for more information. |
| 847 | |
Prabhakar Kushwaha | 24acb83 | 2017-11-23 16:51:32 +0530 | [diff] [blame] | 848 | - MAC address from environment variables |
| 849 | |
| 850 | FDT_SEQ_MACADDR_FROM_ENV |
| 851 | |
| 852 | Fix-up device tree with MAC addresses fetched sequentially from |
| 853 | environment variables. This config work on assumption that |
| 854 | non-usable ethernet node of device-tree are either not present |
| 855 | or their status has been marked as "disabled". |
| 856 | |
wdenk | a3d991b | 2004-04-15 21:48:45 +0000 | [diff] [blame] | 857 | - CDP Options: |
wdenk | 6e59238 | 2004-04-18 17:39:38 +0000 | [diff] [blame] | 858 | CONFIG_CDP_DEVICE_ID |
wdenk | a3d991b | 2004-04-15 21:48:45 +0000 | [diff] [blame] | 859 | |
| 860 | The device id used in CDP trigger frames. |
| 861 | |
| 862 | CONFIG_CDP_DEVICE_ID_PREFIX |
| 863 | |
| 864 | A two character string which is prefixed to the MAC address |
| 865 | of the device. |
| 866 | |
| 867 | CONFIG_CDP_PORT_ID |
| 868 | |
| 869 | A printf format string which contains the ascii name of |
| 870 | the port. Normally is set to "eth%d" which sets |
Marcel Ziswiler | 11ccc33 | 2008-07-09 08:17:15 +0200 | [diff] [blame] | 871 | eth0 for the first Ethernet, eth1 for the second etc. |
wdenk | a3d991b | 2004-04-15 21:48:45 +0000 | [diff] [blame] | 872 | |
| 873 | CONFIG_CDP_CAPABILITIES |
| 874 | |
| 875 | A 32bit integer which indicates the device capabilities; |
| 876 | 0x00000010 for a normal host which does not forwards. |
| 877 | |
| 878 | CONFIG_CDP_VERSION |
| 879 | |
| 880 | An ascii string containing the version of the software. |
| 881 | |
| 882 | CONFIG_CDP_PLATFORM |
| 883 | |
| 884 | An ascii string containing the name of the platform. |
| 885 | |
| 886 | CONFIG_CDP_TRIGGER |
| 887 | |
| 888 | A 32bit integer sent on the trigger. |
| 889 | |
| 890 | CONFIG_CDP_POWER_CONSUMPTION |
| 891 | |
| 892 | A 16bit integer containing the power consumption of the |
| 893 | device in .1 of milliwatts. |
| 894 | |
| 895 | CONFIG_CDP_APPLIANCE_VLAN_TYPE |
| 896 | |
| 897 | A byte containing the id of the VLAN. |
| 898 | |
Uri Mashiach | 79267ed | 2017-01-19 10:51:05 +0200 | [diff] [blame] | 899 | - Status LED: CONFIG_LED_STATUS |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 900 | |
| 901 | Several configurations allow to display the current |
| 902 | status using a LED. For instance, the LED will blink |
| 903 | fast while running U-Boot code, stop blinking as |
| 904 | soon as a reply to a BOOTP request was received, and |
| 905 | start blinking slow once the Linux kernel is running |
| 906 | (supported by a status LED driver in the Linux |
Uri Mashiach | 79267ed | 2017-01-19 10:51:05 +0200 | [diff] [blame] | 907 | kernel). Defining CONFIG_LED_STATUS enables this |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 908 | feature in U-Boot. |
| 909 | |
Igor Grinberg | 1df7bbb | 2013-11-08 01:03:50 +0200 | [diff] [blame] | 910 | Additional options: |
| 911 | |
Uri Mashiach | 79267ed | 2017-01-19 10:51:05 +0200 | [diff] [blame] | 912 | CONFIG_LED_STATUS_GPIO |
Igor Grinberg | 1df7bbb | 2013-11-08 01:03:50 +0200 | [diff] [blame] | 913 | The status LED can be connected to a GPIO pin. |
| 914 | In such cases, the gpio_led driver can be used as a |
Uri Mashiach | 79267ed | 2017-01-19 10:51:05 +0200 | [diff] [blame] | 915 | status LED backend implementation. Define CONFIG_LED_STATUS_GPIO |
Igor Grinberg | 1df7bbb | 2013-11-08 01:03:50 +0200 | [diff] [blame] | 916 | to include the gpio_led driver in the U-Boot binary. |
| 917 | |
Igor Grinberg | 9dfdcdf | 2013-11-08 01:03:52 +0200 | [diff] [blame] | 918 | CONFIG_GPIO_LED_INVERTED_TABLE |
| 919 | Some GPIO connected LEDs may have inverted polarity in which |
| 920 | case the GPIO high value corresponds to LED off state and |
| 921 | GPIO low value corresponds to LED on state. |
| 922 | In such cases CONFIG_GPIO_LED_INVERTED_TABLE may be defined |
| 923 | with a list of GPIO LEDs that have inverted polarity. |
| 924 | |
Tom Rini | 55dabcc | 2021-08-18 23:12:24 -0400 | [diff] [blame] | 925 | - I2C Support: |
Tom Rini | cdc5ed8 | 2022-11-16 13:10:29 -0500 | [diff] [blame^] | 926 | CFG_SYS_NUM_I2C_BUSES |
Simon Glass | 945a18e | 2016-10-02 18:01:05 -0600 | [diff] [blame] | 927 | Hold the number of i2c buses you want to use. |
Heiko Schocher | 3f4978c | 2012-01-16 21:12:24 +0000 | [diff] [blame] | 928 | |
| 929 | CONFIG_SYS_I2C_DIRECT_BUS |
| 930 | define this, if you don't use i2c muxes on your hardware. |
| 931 | if CONFIG_SYS_I2C_MAX_HOPS is not defined or == 0 you can |
| 932 | omit this define. |
| 933 | |
| 934 | CONFIG_SYS_I2C_MAX_HOPS |
| 935 | define how many muxes are maximal consecutively connected |
| 936 | on one i2c bus. If you not use i2c muxes, omit this |
| 937 | define. |
| 938 | |
| 939 | CONFIG_SYS_I2C_BUSES |
Jeremiah Mahler | b445bbb | 2015-01-04 18:56:50 -0800 | [diff] [blame] | 940 | hold a list of buses you want to use, only used if |
Heiko Schocher | 3f4978c | 2012-01-16 21:12:24 +0000 | [diff] [blame] | 941 | CONFIG_SYS_I2C_DIRECT_BUS is not defined, for example |
| 942 | a board with CONFIG_SYS_I2C_MAX_HOPS = 1 and |
Tom Rini | cdc5ed8 | 2022-11-16 13:10:29 -0500 | [diff] [blame^] | 943 | CFG_SYS_NUM_I2C_BUSES = 9: |
Heiko Schocher | 3f4978c | 2012-01-16 21:12:24 +0000 | [diff] [blame] | 944 | |
| 945 | CONFIG_SYS_I2C_BUSES {{0, {I2C_NULL_HOP}}, \ |
| 946 | {0, {{I2C_MUX_PCA9547, 0x70, 1}}}, \ |
| 947 | {0, {{I2C_MUX_PCA9547, 0x70, 2}}}, \ |
| 948 | {0, {{I2C_MUX_PCA9547, 0x70, 3}}}, \ |
| 949 | {0, {{I2C_MUX_PCA9547, 0x70, 4}}}, \ |
| 950 | {0, {{I2C_MUX_PCA9547, 0x70, 5}}}, \ |
| 951 | {1, {I2C_NULL_HOP}}, \ |
| 952 | {1, {{I2C_MUX_PCA9544, 0x72, 1}}}, \ |
| 953 | {1, {{I2C_MUX_PCA9544, 0x72, 2}}}, \ |
| 954 | } |
| 955 | |
| 956 | which defines |
| 957 | bus 0 on adapter 0 without a mux |
Heiko Schocher | ea818db | 2013-01-29 08:53:15 +0100 | [diff] [blame] | 958 | bus 1 on adapter 0 with a PCA9547 on address 0x70 port 1 |
| 959 | bus 2 on adapter 0 with a PCA9547 on address 0x70 port 2 |
| 960 | bus 3 on adapter 0 with a PCA9547 on address 0x70 port 3 |
| 961 | bus 4 on adapter 0 with a PCA9547 on address 0x70 port 4 |
| 962 | bus 5 on adapter 0 with a PCA9547 on address 0x70 port 5 |
Heiko Schocher | 3f4978c | 2012-01-16 21:12:24 +0000 | [diff] [blame] | 963 | bus 6 on adapter 1 without a mux |
Heiko Schocher | ea818db | 2013-01-29 08:53:15 +0100 | [diff] [blame] | 964 | bus 7 on adapter 1 with a PCA9544 on address 0x72 port 1 |
| 965 | bus 8 on adapter 1 with a PCA9544 on address 0x72 port 2 |
Heiko Schocher | 3f4978c | 2012-01-16 21:12:24 +0000 | [diff] [blame] | 966 | |
| 967 | If you do not have i2c muxes on your board, omit this define. |
| 968 | |
Simon Glass | ce3b5d6 | 2017-05-12 21:10:00 -0600 | [diff] [blame] | 969 | - Legacy I2C Support: |
Heiko Schocher | ea818db | 2013-01-29 08:53:15 +0100 | [diff] [blame] | 970 | If you use the software i2c interface (CONFIG_SYS_I2C_SOFT) |
wdenk | b37c7e5 | 2003-06-30 16:24:52 +0000 | [diff] [blame] | 971 | then the following macros need to be defined (examples are |
| 972 | from include/configs/lwmon.h): |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 973 | |
| 974 | I2C_INIT |
| 975 | |
wdenk | b37c7e5 | 2003-06-30 16:24:52 +0000 | [diff] [blame] | 976 | (Optional). Any commands necessary to enable the I2C |
wdenk | 43d9616 | 2003-03-06 00:02:04 +0000 | [diff] [blame] | 977 | controller or configure ports. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 978 | |
wdenk | ba56f62 | 2004-02-06 23:19:44 +0000 | [diff] [blame] | 979 | eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |= PB_SCL) |
wdenk | b37c7e5 | 2003-06-30 16:24:52 +0000 | [diff] [blame] | 980 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 981 | I2C_ACTIVE |
| 982 | |
| 983 | The code necessary to make the I2C data line active |
| 984 | (driven). If the data line is open collector, this |
| 985 | define can be null. |
| 986 | |
wdenk | b37c7e5 | 2003-06-30 16:24:52 +0000 | [diff] [blame] | 987 | eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |= PB_SDA) |
| 988 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 989 | I2C_TRISTATE |
| 990 | |
| 991 | The code necessary to make the I2C data line tri-stated |
| 992 | (inactive). If the data line is open collector, this |
| 993 | define can be null. |
| 994 | |
wdenk | b37c7e5 | 2003-06-30 16:24:52 +0000 | [diff] [blame] | 995 | eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA) |
| 996 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 997 | I2C_READ |
| 998 | |
York Sun | 472d546 | 2013-04-01 11:29:11 -0700 | [diff] [blame] | 999 | Code that returns true if the I2C data line is high, |
| 1000 | false if it is low. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1001 | |
wdenk | b37c7e5 | 2003-06-30 16:24:52 +0000 | [diff] [blame] | 1002 | eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0) |
| 1003 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1004 | I2C_SDA(bit) |
| 1005 | |
York Sun | 472d546 | 2013-04-01 11:29:11 -0700 | [diff] [blame] | 1006 | If <bit> is true, sets the I2C data line high. If it |
| 1007 | is false, it clears it (low). |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1008 | |
wdenk | b37c7e5 | 2003-06-30 16:24:52 +0000 | [diff] [blame] | 1009 | eg: #define I2C_SDA(bit) \ |
wdenk | 2535d60 | 2003-07-17 23:16:40 +0000 | [diff] [blame] | 1010 | if(bit) immr->im_cpm.cp_pbdat |= PB_SDA; \ |
wdenk | ba56f62 | 2004-02-06 23:19:44 +0000 | [diff] [blame] | 1011 | else immr->im_cpm.cp_pbdat &= ~PB_SDA |
wdenk | b37c7e5 | 2003-06-30 16:24:52 +0000 | [diff] [blame] | 1012 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1013 | I2C_SCL(bit) |
| 1014 | |
York Sun | 472d546 | 2013-04-01 11:29:11 -0700 | [diff] [blame] | 1015 | If <bit> is true, sets the I2C clock line high. If it |
| 1016 | is false, it clears it (low). |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1017 | |
wdenk | b37c7e5 | 2003-06-30 16:24:52 +0000 | [diff] [blame] | 1018 | eg: #define I2C_SCL(bit) \ |
wdenk | 2535d60 | 2003-07-17 23:16:40 +0000 | [diff] [blame] | 1019 | if(bit) immr->im_cpm.cp_pbdat |= PB_SCL; \ |
wdenk | ba56f62 | 2004-02-06 23:19:44 +0000 | [diff] [blame] | 1020 | else immr->im_cpm.cp_pbdat &= ~PB_SCL |
wdenk | b37c7e5 | 2003-06-30 16:24:52 +0000 | [diff] [blame] | 1021 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1022 | I2C_DELAY |
| 1023 | |
| 1024 | This delay is invoked four times per clock cycle so this |
| 1025 | controls the rate of data transfer. The data rate thus |
wdenk | b37c7e5 | 2003-06-30 16:24:52 +0000 | [diff] [blame] | 1026 | is 1 / (I2C_DELAY * 4). Often defined to be something |
wdenk | 945af8d | 2003-07-16 21:53:01 +0000 | [diff] [blame] | 1027 | like: |
| 1028 | |
wdenk | b37c7e5 | 2003-06-30 16:24:52 +0000 | [diff] [blame] | 1029 | #define I2C_DELAY udelay(2) |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1030 | |
Mike Frysinger | 793b572 | 2010-07-21 13:38:02 -0400 | [diff] [blame] | 1031 | CONFIG_SOFT_I2C_GPIO_SCL / CONFIG_SOFT_I2C_GPIO_SDA |
| 1032 | |
| 1033 | If your arch supports the generic GPIO framework (asm/gpio.h), |
| 1034 | then you may alternatively define the two GPIOs that are to be |
| 1035 | used as SCL / SDA. Any of the previous I2C_xxx macros will |
| 1036 | have GPIO-based defaults assigned to them as appropriate. |
| 1037 | |
| 1038 | You should define these to the GPIO value as given directly to |
| 1039 | the generic GPIO functions. |
| 1040 | |
Ben Warren | bb99ad6 | 2006-09-07 16:50:54 -0400 | [diff] [blame] | 1041 | CONFIG_I2C_MULTI_BUS |
| 1042 | |
| 1043 | This option allows the use of multiple I2C buses, each of which |
Wolfgang Denk | c0f4085 | 2011-10-26 10:21:21 +0000 | [diff] [blame] | 1044 | must have a controller. At any point in time, only one bus is |
| 1045 | active. To switch to a different bus, use the 'i2c dev' command. |
Ben Warren | bb99ad6 | 2006-09-07 16:50:54 -0400 | [diff] [blame] | 1046 | Note that bus numbering is zero-based. |
| 1047 | |
Jean-Christophe PLAGNIOL-VILLARD | 6d0f6bc | 2008-10-16 15:01:15 +0200 | [diff] [blame] | 1048 | CONFIG_SYS_I2C_NOPROBES |
Ben Warren | bb99ad6 | 2006-09-07 16:50:54 -0400 | [diff] [blame] | 1049 | |
| 1050 | This option specifies a list of I2C devices that will be skipped |
Wolfgang Denk | c0f4085 | 2011-10-26 10:21:21 +0000 | [diff] [blame] | 1051 | when the 'i2c probe' command is issued. If CONFIG_I2C_MULTI_BUS |
Peter Tyser | 0f89c54 | 2009-04-18 22:34:03 -0500 | [diff] [blame] | 1052 | is set, specify a list of bus-device pairs. Otherwise, specify |
| 1053 | a 1D array of device addresses |
Ben Warren | bb99ad6 | 2006-09-07 16:50:54 -0400 | [diff] [blame] | 1054 | |
| 1055 | e.g. |
| 1056 | #undef CONFIG_I2C_MULTI_BUS |
Wolfgang Denk | c0f4085 | 2011-10-26 10:21:21 +0000 | [diff] [blame] | 1057 | #define CONFIG_SYS_I2C_NOPROBES {0x50,0x68} |
Ben Warren | bb99ad6 | 2006-09-07 16:50:54 -0400 | [diff] [blame] | 1058 | |
| 1059 | will skip addresses 0x50 and 0x68 on a board with one I2C bus |
| 1060 | |
Wolfgang Denk | c0f4085 | 2011-10-26 10:21:21 +0000 | [diff] [blame] | 1061 | #define CONFIG_I2C_MULTI_BUS |
Simon Glass | 945a18e | 2016-10-02 18:01:05 -0600 | [diff] [blame] | 1062 | #define CONFIG_SYS_I2C_NOPROBES {{0,0x50},{0,0x68},{1,0x54}} |
Ben Warren | bb99ad6 | 2006-09-07 16:50:54 -0400 | [diff] [blame] | 1063 | |
| 1064 | will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1 |
| 1065 | |
Jean-Christophe PLAGNIOL-VILLARD | 6d0f6bc | 2008-10-16 15:01:15 +0200 | [diff] [blame] | 1066 | CONFIG_SYS_RTC_BUS_NUM |
Stefan Roese | 0dc018e | 2007-02-20 10:51:26 +0100 | [diff] [blame] | 1067 | |
| 1068 | If defined, then this indicates the I2C bus number for the RTC. |
| 1069 | If not defined, then U-Boot assumes that RTC is on I2C bus 0. |
| 1070 | |
Andrew Dyer | 2ac6985 | 2008-12-29 17:36:01 -0600 | [diff] [blame] | 1071 | CONFIG_SOFT_I2C_READ_REPEATED_START |
| 1072 | |
| 1073 | defining this will force the i2c_read() function in |
| 1074 | the soft_i2c driver to perform an I2C repeated start |
| 1075 | between writing the address pointer and reading the |
| 1076 | data. If this define is omitted the default behaviour |
| 1077 | of doing a stop-start sequence will be used. Most I2C |
| 1078 | devices can use either method, but some require one or |
| 1079 | the other. |
Timur Tabi | be5e618 | 2006-11-03 19:15:00 -0600 | [diff] [blame] | 1080 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1081 | - SPI Support: CONFIG_SPI |
| 1082 | |
| 1083 | Enables SPI driver (so far only tested with |
| 1084 | SPI EEPROM, also an instance works with Crystal A/D and |
| 1085 | D/As on the SACSng board) |
| 1086 | |
Heiko Schocher | f659b57 | 2014-07-14 10:22:11 +0200 | [diff] [blame] | 1087 | CONFIG_SYS_SPI_MXC_WAIT |
| 1088 | Timeout for waiting until spi transfer completed. |
| 1089 | default: (CONFIG_SYS_HZ/100) /* 10 ms */ |
| 1090 | |
Matthias Fuchs | 0133502 | 2007-12-27 17:12:34 +0100 | [diff] [blame] | 1091 | - FPGA Support: CONFIG_FPGA |
| 1092 | |
| 1093 | Enables FPGA subsystem. |
| 1094 | |
| 1095 | CONFIG_FPGA_<vendor> |
| 1096 | |
| 1097 | Enables support for specific chip vendors. |
| 1098 | (ALTERA, XILINX) |
| 1099 | |
| 1100 | CONFIG_FPGA_<family> |
| 1101 | |
| 1102 | Enables support for FPGA family. |
| 1103 | (SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX) |
| 1104 | |
Jean-Christophe PLAGNIOL-VILLARD | 6d0f6bc | 2008-10-16 15:01:15 +0200 | [diff] [blame] | 1105 | CONFIG_SYS_FPGA_CHECK_BUSY |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1106 | |
wdenk | 43d9616 | 2003-03-06 00:02:04 +0000 | [diff] [blame] | 1107 | Enable checks on FPGA configuration interface busy |
| 1108 | status by the configuration function. This option |
| 1109 | will require a board or device specific function to |
| 1110 | be written. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1111 | |
| 1112 | CONFIG_FPGA_DELAY |
| 1113 | |
| 1114 | If defined, a function that provides delays in the FPGA |
| 1115 | configuration driver. |
| 1116 | |
Jean-Christophe PLAGNIOL-VILLARD | 6d0f6bc | 2008-10-16 15:01:15 +0200 | [diff] [blame] | 1117 | CONFIG_SYS_FPGA_CHECK_ERROR |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1118 | |
wdenk | 43d9616 | 2003-03-06 00:02:04 +0000 | [diff] [blame] | 1119 | Check for configuration errors during FPGA bitfile |
| 1120 | loading. For example, abort during Virtex II |
| 1121 | configuration if the INIT_B line goes low (which |
| 1122 | indicated a CRC error). |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1123 | |
Jean-Christophe PLAGNIOL-VILLARD | 6d0f6bc | 2008-10-16 15:01:15 +0200 | [diff] [blame] | 1124 | CONFIG_SYS_FPGA_WAIT_INIT |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1125 | |
Jeremiah Mahler | b445bbb | 2015-01-04 18:56:50 -0800 | [diff] [blame] | 1126 | Maximum time to wait for the INIT_B line to de-assert |
| 1127 | after PROB_B has been de-asserted during a Virtex II |
wdenk | 43d9616 | 2003-03-06 00:02:04 +0000 | [diff] [blame] | 1128 | FPGA configuration sequence. The default time is 500 |
Marcel Ziswiler | 11ccc33 | 2008-07-09 08:17:15 +0200 | [diff] [blame] | 1129 | ms. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1130 | |
Jean-Christophe PLAGNIOL-VILLARD | 6d0f6bc | 2008-10-16 15:01:15 +0200 | [diff] [blame] | 1131 | CONFIG_SYS_FPGA_WAIT_BUSY |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1132 | |
Jeremiah Mahler | b445bbb | 2015-01-04 18:56:50 -0800 | [diff] [blame] | 1133 | Maximum time to wait for BUSY to de-assert during |
Marcel Ziswiler | 11ccc33 | 2008-07-09 08:17:15 +0200 | [diff] [blame] | 1134 | Virtex II FPGA configuration. The default is 5 ms. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1135 | |
Jean-Christophe PLAGNIOL-VILLARD | 6d0f6bc | 2008-10-16 15:01:15 +0200 | [diff] [blame] | 1136 | CONFIG_SYS_FPGA_WAIT_CONFIG |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1137 | |
wdenk | 43d9616 | 2003-03-06 00:02:04 +0000 | [diff] [blame] | 1138 | Time to wait after FPGA configuration. The default is |
Marcel Ziswiler | 11ccc33 | 2008-07-09 08:17:15 +0200 | [diff] [blame] | 1139 | 200 ms. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1140 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1141 | - Vendor Parameter Protection: |
| 1142 | |
wdenk | 43d9616 | 2003-03-06 00:02:04 +0000 | [diff] [blame] | 1143 | U-Boot considers the values of the environment |
| 1144 | variables "serial#" (Board Serial Number) and |
wdenk | 7152b1d | 2003-09-05 23:19:14 +0000 | [diff] [blame] | 1145 | "ethaddr" (Ethernet Address) to be parameters that |
wdenk | 43d9616 | 2003-03-06 00:02:04 +0000 | [diff] [blame] | 1146 | are set once by the board vendor / manufacturer, and |
| 1147 | protects these variables from casual modification by |
| 1148 | the user. Once set, these variables are read-only, |
| 1149 | and write or delete attempts are rejected. You can |
Marcel Ziswiler | 11ccc33 | 2008-07-09 08:17:15 +0200 | [diff] [blame] | 1150 | change this behaviour: |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1151 | |
| 1152 | If CONFIG_ENV_OVERWRITE is #defined in your config |
| 1153 | file, the write protection for vendor parameters is |
wdenk | 47cd00f | 2003-03-06 13:39:27 +0000 | [diff] [blame] | 1154 | completely disabled. Anybody can change or delete |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1155 | these parameters. |
| 1156 | |
Joe Hershberger | 92ac520 | 2015-05-04 14:55:14 -0500 | [diff] [blame] | 1157 | Alternatively, if you define _both_ an ethaddr in the |
| 1158 | default env _and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default |
Marcel Ziswiler | 11ccc33 | 2008-07-09 08:17:15 +0200 | [diff] [blame] | 1159 | Ethernet address is installed in the environment, |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1160 | which can be changed exactly ONCE by the user. [The |
| 1161 | serial# is unaffected by this, i. e. it remains |
| 1162 | read-only.] |
| 1163 | |
Joe Hershberger | 2598090 | 2012-12-11 22:16:31 -0600 | [diff] [blame] | 1164 | The same can be accomplished in a more flexible way |
| 1165 | for any variable by configuring the type of access |
| 1166 | to allow for those variables in the ".flags" variable |
| 1167 | or define CONFIG_ENV_FLAGS_LIST_STATIC. |
| 1168 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1169 | - Protected RAM: |
| 1170 | CONFIG_PRAM |
| 1171 | |
| 1172 | Define this variable to enable the reservation of |
| 1173 | "protected RAM", i. e. RAM which is not overwritten |
| 1174 | by U-Boot. Define CONFIG_PRAM to hold the number of |
| 1175 | kB you want to reserve for pRAM. You can overwrite |
| 1176 | this default value by defining an environment |
| 1177 | variable "pram" to the number of kB you want to |
| 1178 | reserve. Note that the board info structure will |
| 1179 | still show the full amount of RAM. If pRAM is |
| 1180 | reserved, a new environment variable "mem" will |
| 1181 | automatically be defined to hold the amount of |
| 1182 | remaining RAM in a form that can be passed as boot |
| 1183 | argument to Linux, for instance like that: |
| 1184 | |
Wolfgang Denk | fe126d8 | 2005-11-20 21:40:11 +0100 | [diff] [blame] | 1185 | setenv bootargs ... mem=\${mem} |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1186 | saveenv |
| 1187 | |
| 1188 | This way you can tell Linux not to use this memory, |
| 1189 | either, which results in a memory region that will |
| 1190 | not be affected by reboots. |
| 1191 | |
| 1192 | *WARNING* If your board configuration uses automatic |
| 1193 | detection of the RAM size, you must make sure that |
| 1194 | this memory test is non-destructive. So far, the |
| 1195 | following board configurations are known to be |
| 1196 | "pRAM-clean": |
| 1197 | |
Heiko Schocher | 5b8e76c | 2017-06-07 17:33:09 +0200 | [diff] [blame] | 1198 | IVMS8, IVML24, SPD8xx, |
Wolfgang Denk | 1b0757e | 2012-10-24 02:36:15 +0000 | [diff] [blame] | 1199 | HERMES, IP860, RPXlite, LWMON, |
Heiko Schocher | 2eb48ff | 2017-06-07 17:33:10 +0200 | [diff] [blame] | 1200 | FLAGADM |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1201 | |
| 1202 | - Error Recovery: |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1203 | Note: |
| 1204 | |
wdenk | 8bde7f7 | 2003-06-27 21:31:46 +0000 | [diff] [blame] | 1205 | In the current implementation, the local variables |
| 1206 | space and global environment variables space are |
| 1207 | separated. Local variables are those you define by |
| 1208 | simply typing `name=value'. To access a local |
| 1209 | variable later on, you have write `$name' or |
| 1210 | `${name}'; to execute the contents of a variable |
| 1211 | directly type `$name' at the command prompt. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1212 | |
wdenk | 43d9616 | 2003-03-06 00:02:04 +0000 | [diff] [blame] | 1213 | Global environment variables are those you use |
| 1214 | setenv/printenv to work with. To run a command stored |
| 1215 | in such a variable, you need to use the run command, |
| 1216 | and you must not use the '$' sign to access them. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1217 | |
| 1218 | To store commands and special characters in a |
| 1219 | variable, please use double quotation marks |
| 1220 | surrounding the whole text of the variable, instead |
| 1221 | of the backslashes before semicolons and special |
| 1222 | symbols. |
| 1223 | |
wdenk | a8c7c70 | 2003-12-06 19:49:23 +0000 | [diff] [blame] | 1224 | - Default Environment: |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1225 | CONFIG_EXTRA_ENV_SETTINGS |
| 1226 | |
wdenk | 43d9616 | 2003-03-06 00:02:04 +0000 | [diff] [blame] | 1227 | Define this to contain any number of null terminated |
| 1228 | strings (variable = value pairs) that will be part of |
wdenk | 7152b1d | 2003-09-05 23:19:14 +0000 | [diff] [blame] | 1229 | the default environment compiled into the boot image. |
wdenk | 2262cfe | 2002-11-18 00:14:45 +0000 | [diff] [blame] | 1230 | |
wdenk | 43d9616 | 2003-03-06 00:02:04 +0000 | [diff] [blame] | 1231 | For example, place something like this in your |
| 1232 | board's config file: |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1233 | |
| 1234 | #define CONFIG_EXTRA_ENV_SETTINGS \ |
| 1235 | "myvar1=value1\0" \ |
| 1236 | "myvar2=value2\0" |
| 1237 | |
wdenk | 43d9616 | 2003-03-06 00:02:04 +0000 | [diff] [blame] | 1238 | Warning: This method is based on knowledge about the |
| 1239 | internal format how the environment is stored by the |
| 1240 | U-Boot code. This is NOT an official, exported |
| 1241 | interface! Although it is unlikely that this format |
wdenk | 7152b1d | 2003-09-05 23:19:14 +0000 | [diff] [blame] | 1242 | will change soon, there is no guarantee either. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1243 | You better know what you are doing here. |
| 1244 | |
wdenk | 43d9616 | 2003-03-06 00:02:04 +0000 | [diff] [blame] | 1245 | Note: overly (ab)use of the default environment is |
| 1246 | discouraged. Make sure to check other ways to preset |
Wolfgang Denk | 74de7ae | 2009-04-01 23:34:12 +0200 | [diff] [blame] | 1247 | the environment like the "source" command or the |
wdenk | 43d9616 | 2003-03-06 00:02:04 +0000 | [diff] [blame] | 1248 | boot command first. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1249 | |
Simon Glass | 06fd853 | 2012-11-30 13:01:17 +0000 | [diff] [blame] | 1250 | CONFIG_DELAY_ENVIRONMENT |
| 1251 | |
| 1252 | Normally the environment is loaded when the board is |
Jeremiah Mahler | b445bbb | 2015-01-04 18:56:50 -0800 | [diff] [blame] | 1253 | initialised so that it is available to U-Boot. This inhibits |
Simon Glass | 06fd853 | 2012-11-30 13:01:17 +0000 | [diff] [blame] | 1254 | that so that the environment is not available until |
| 1255 | explicitly loaded later by U-Boot code. With CONFIG_OF_CONTROL |
| 1256 | this is instead controlled by the value of |
| 1257 | /config/load-environment. |
| 1258 | |
Wolfgang Denk | 4cf2609 | 2011-10-07 09:58:21 +0200 | [diff] [blame] | 1259 | CONFIG_STANDALONE_LOAD_ADDR |
| 1260 | |
Wolfgang Denk | 6feff89 | 2011-10-09 21:06:34 +0200 | [diff] [blame] | 1261 | This option defines a board specific value for the |
| 1262 | address where standalone program gets loaded, thus |
| 1263 | overwriting the architecture dependent default |
Wolfgang Denk | 4cf2609 | 2011-10-07 09:58:21 +0200 | [diff] [blame] | 1264 | settings. |
| 1265 | |
Detlev Zundel | cccfc2a | 2009-12-01 17:16:19 +0100 | [diff] [blame] | 1266 | - Automatic software updates via TFTP server |
| 1267 | CONFIG_UPDATE_TFTP |
| 1268 | CONFIG_UPDATE_TFTP_CNT_MAX |
| 1269 | CONFIG_UPDATE_TFTP_MSEC_MAX |
| 1270 | |
| 1271 | These options enable and control the auto-update feature; |
| 1272 | for a more detailed description refer to doc/README.update. |
| 1273 | |
| 1274 | - MTD Support (mtdparts command, UBI support) |
Heiko Schocher | ff94bc4 | 2014-06-24 10:10:04 +0200 | [diff] [blame] | 1275 | CONFIG_MTD_UBI_WL_THRESHOLD |
| 1276 | This parameter defines the maximum difference between the highest |
| 1277 | erase counter value and the lowest erase counter value of eraseblocks |
| 1278 | of UBI devices. When this threshold is exceeded, UBI starts performing |
| 1279 | wear leveling by means of moving data from eraseblock with low erase |
| 1280 | counter to eraseblocks with high erase counter. |
| 1281 | |
| 1282 | The default value should be OK for SLC NAND flashes, NOR flashes and |
| 1283 | other flashes which have eraseblock life-cycle 100000 or more. |
| 1284 | However, in case of MLC NAND flashes which typically have eraseblock |
| 1285 | life-cycle less than 10000, the threshold should be lessened (e.g., |
| 1286 | to 128 or 256, although it does not have to be power of 2). |
| 1287 | |
| 1288 | default: 4096 |
Simon Glass | c654b51 | 2014-10-23 18:58:54 -0600 | [diff] [blame] | 1289 | |
Heiko Schocher | ff94bc4 | 2014-06-24 10:10:04 +0200 | [diff] [blame] | 1290 | CONFIG_MTD_UBI_BEB_LIMIT |
| 1291 | This option specifies the maximum bad physical eraseblocks UBI |
| 1292 | expects on the MTD device (per 1024 eraseblocks). If the |
| 1293 | underlying flash does not admit of bad eraseblocks (e.g. NOR |
| 1294 | flash), this value is ignored. |
| 1295 | |
| 1296 | NAND datasheets often specify the minimum and maximum NVM |
| 1297 | (Number of Valid Blocks) for the flashes' endurance lifetime. |
| 1298 | The maximum expected bad eraseblocks per 1024 eraseblocks |
| 1299 | then can be calculated as "1024 * (1 - MinNVB / MaxNVB)", |
| 1300 | which gives 20 for most NANDs (MaxNVB is basically the total |
| 1301 | count of eraseblocks on the chip). |
| 1302 | |
| 1303 | To put it differently, if this value is 20, UBI will try to |
| 1304 | reserve about 1.9% of physical eraseblocks for bad blocks |
| 1305 | handling. And that will be 1.9% of eraseblocks on the entire |
| 1306 | NAND chip, not just the MTD partition UBI attaches. This means |
| 1307 | that if you have, say, a NAND flash chip admits maximum 40 bad |
| 1308 | eraseblocks, and it is split on two MTD partitions of the same |
| 1309 | size, UBI will reserve 40 eraseblocks when attaching a |
| 1310 | partition. |
| 1311 | |
| 1312 | default: 20 |
| 1313 | |
| 1314 | CONFIG_MTD_UBI_FASTMAP |
| 1315 | Fastmap is a mechanism which allows attaching an UBI device |
| 1316 | in nearly constant time. Instead of scanning the whole MTD device it |
| 1317 | only has to locate a checkpoint (called fastmap) on the device. |
| 1318 | The on-flash fastmap contains all information needed to attach |
| 1319 | the device. Using fastmap makes only sense on large devices where |
| 1320 | attaching by scanning takes long. UBI will not automatically install |
| 1321 | a fastmap on old images, but you can set the UBI parameter |
| 1322 | CONFIG_MTD_UBI_FASTMAP_AUTOCONVERT to 1 if you want so. Please note |
| 1323 | that fastmap-enabled images are still usable with UBI implementations |
| 1324 | without fastmap support. On typical flash devices the whole fastmap |
| 1325 | fits into one PEB. UBI will reserve PEBs to hold two fastmaps. |
| 1326 | |
| 1327 | CONFIG_MTD_UBI_FASTMAP_AUTOCONVERT |
| 1328 | Set this parameter to enable fastmap automatically on images |
| 1329 | without a fastmap. |
| 1330 | default: 0 |
| 1331 | |
Heiko Schocher | 0195a7b | 2015-10-22 06:19:21 +0200 | [diff] [blame] | 1332 | CONFIG_MTD_UBI_FM_DEBUG |
| 1333 | Enable UBI fastmap debug |
| 1334 | default: 0 |
| 1335 | |
Daniel Schwierzeck | 6a11cf4 | 2011-07-18 07:48:07 +0000 | [diff] [blame] | 1336 | - SPL framework |
Wolfgang Denk | 04e5ae7 | 2011-09-11 21:24:09 +0200 | [diff] [blame] | 1337 | CONFIG_SPL |
| 1338 | Enable building of SPL globally. |
Daniel Schwierzeck | 6a11cf4 | 2011-07-18 07:48:07 +0000 | [diff] [blame] | 1339 | |
Albert ARIBAUD \(3ADEV\) | 8c80eb3 | 2015-03-31 11:40:50 +0200 | [diff] [blame] | 1340 | CONFIG_SPL_PANIC_ON_RAW_IMAGE |
| 1341 | When defined, SPL will panic() if the image it has |
| 1342 | loaded does not have a signature. |
| 1343 | Defining this is useful when code which loads images |
| 1344 | in SPL cannot guarantee that absolutely all read errors |
| 1345 | will be caught. |
| 1346 | An example is the LPC32XX MLC NAND driver, which will |
| 1347 | consider that a completely unreadable NAND block is bad, |
| 1348 | and thus should be skipped silently. |
| 1349 | |
Tom Rini | 861a86f | 2012-08-13 11:37:56 -0700 | [diff] [blame] | 1350 | CONFIG_SPL_DISPLAY_PRINT |
| 1351 | For ARM, enable an optional function to print more information |
| 1352 | about the running system. |
| 1353 | |
Scott Wood | 06f60ae | 2012-12-06 13:33:17 +0000 | [diff] [blame] | 1354 | CONFIG_SPL_MPC83XX_WAIT_FOR_NAND |
| 1355 | Set this for NAND SPL on PPC mpc83xx targets, so that |
| 1356 | start.S waits for the rest of the SPL to load before |
| 1357 | continuing (the hardware starts execution after just |
| 1358 | loading the first page rather than the full 4K). |
| 1359 | |
Thomas Gleixner | 6f4e7d3 | 2016-07-12 20:28:12 +0200 | [diff] [blame] | 1360 | CONFIG_SPL_UBI |
| 1361 | Support for a lightweight UBI (fastmap) scanner and |
| 1362 | loader |
| 1363 | |
Tom Rini | 9557979 | 2012-02-14 07:29:40 +0000 | [diff] [blame] | 1364 | CONFIG_SYS_NAND_5_ADDR_CYCLE, CONFIG_SYS_NAND_PAGE_COUNT, |
| 1365 | CONFIG_SYS_NAND_PAGE_SIZE, CONFIG_SYS_NAND_OOBSIZE, |
| 1366 | CONFIG_SYS_NAND_BLOCK_SIZE, CONFIG_SYS_NAND_BAD_BLOCK_POS, |
Tom Rini | 4e59094 | 2022-11-12 17:36:51 -0500 | [diff] [blame] | 1367 | CFG_SYS_NAND_ECCPOS, CFG_SYS_NAND_ECCSIZE, |
| 1368 | CFG_SYS_NAND_ECCBYTES |
Tom Rini | 9557979 | 2012-02-14 07:29:40 +0000 | [diff] [blame] | 1369 | Defines the size and behavior of the NAND that SPL uses |
Scott Wood | 7d4b795 | 2012-09-21 18:35:27 -0500 | [diff] [blame] | 1370 | to read U-Boot |
Tom Rini | 9557979 | 2012-02-14 07:29:40 +0000 | [diff] [blame] | 1371 | |
Tom Rini | 4e59094 | 2022-11-12 17:36:51 -0500 | [diff] [blame] | 1372 | CFG_SYS_NAND_U_BOOT_DST |
Scott Wood | 7d4b795 | 2012-09-21 18:35:27 -0500 | [diff] [blame] | 1373 | Location in memory to load U-Boot to |
| 1374 | |
Tom Rini | 4e59094 | 2022-11-12 17:36:51 -0500 | [diff] [blame] | 1375 | CFG_SYS_NAND_U_BOOT_SIZE |
Scott Wood | 7d4b795 | 2012-09-21 18:35:27 -0500 | [diff] [blame] | 1376 | Size of image to load |
Tom Rini | 9557979 | 2012-02-14 07:29:40 +0000 | [diff] [blame] | 1377 | |
Tom Rini | 4e59094 | 2022-11-12 17:36:51 -0500 | [diff] [blame] | 1378 | CFG_SYS_NAND_U_BOOT_START |
Scott Wood | 7d4b795 | 2012-09-21 18:35:27 -0500 | [diff] [blame] | 1379 | Entry point in loaded image to jump to |
Tom Rini | 9557979 | 2012-02-14 07:29:40 +0000 | [diff] [blame] | 1380 | |
Pavel Machek | c57b953 | 2012-08-30 22:42:11 +0200 | [diff] [blame] | 1381 | CONFIG_SPL_RAM_DEVICE |
| 1382 | Support for running image already present in ram, in SPL binary |
| 1383 | |
Marek Vasut | b527b9c | 2018-05-13 00:22:52 +0200 | [diff] [blame] | 1384 | CONFIG_SPL_FIT_PRINT |
Simon Glass | 87ebee3 | 2013-05-08 08:05:59 +0000 | [diff] [blame] | 1385 | Printing information about a FIT image adds quite a bit of |
| 1386 | code to SPL. So this is normally disabled in SPL. Use this |
| 1387 | option to re-enable it. This will affect the output of the |
| 1388 | bootm command when booting a FIT image. |
| 1389 | |
wdenk | a8c7c70 | 2003-12-06 19:49:23 +0000 | [diff] [blame] | 1390 | - Interrupt support (PPC): |
| 1391 | |
wdenk | d4ca31c | 2004-01-02 14:00:00 +0000 | [diff] [blame] | 1392 | There are common interrupt_init() and timer_interrupt() |
| 1393 | for all PPC archs. interrupt_init() calls interrupt_init_cpu() |
Marcel Ziswiler | 11ccc33 | 2008-07-09 08:17:15 +0200 | [diff] [blame] | 1394 | for CPU specific initialization. interrupt_init_cpu() |
wdenk | d4ca31c | 2004-01-02 14:00:00 +0000 | [diff] [blame] | 1395 | should set decrementer_count to appropriate value. If |
Marcel Ziswiler | 11ccc33 | 2008-07-09 08:17:15 +0200 | [diff] [blame] | 1396 | CPU resets decrementer automatically after interrupt |
wdenk | d4ca31c | 2004-01-02 14:00:00 +0000 | [diff] [blame] | 1397 | (ppc4xx) it should set decrementer_count to zero. |
Marcel Ziswiler | 11ccc33 | 2008-07-09 08:17:15 +0200 | [diff] [blame] | 1398 | timer_interrupt() calls timer_interrupt_cpu() for CPU |
wdenk | d4ca31c | 2004-01-02 14:00:00 +0000 | [diff] [blame] | 1399 | specific handling. If board has watchdog / status_led |
| 1400 | / other_activity_monitor it works automatically from |
| 1401 | general timer_interrupt(). |
wdenk | a8c7c70 | 2003-12-06 19:49:23 +0000 | [diff] [blame] | 1402 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1403 | |
Helmut Raiger | 9660e44 | 2011-10-20 04:19:47 +0000 | [diff] [blame] | 1404 | Board initialization settings: |
| 1405 | ------------------------------ |
| 1406 | |
| 1407 | During Initialization u-boot calls a number of board specific functions |
| 1408 | to allow the preparation of board specific prerequisites, e.g. pin setup |
| 1409 | before drivers are initialized. To enable these callbacks the |
| 1410 | following configuration macros have to be defined. Currently this is |
| 1411 | architecture specific, so please check arch/your_architecture/lib/board.c |
| 1412 | typically in board_init_f() and board_init_r(). |
| 1413 | |
| 1414 | - CONFIG_BOARD_EARLY_INIT_F: Call board_early_init_f() |
| 1415 | - CONFIG_BOARD_EARLY_INIT_R: Call board_early_init_r() |
| 1416 | - CONFIG_BOARD_LATE_INIT: Call board_late_init() |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1417 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1418 | Configuration Settings: |
| 1419 | ----------------------- |
| 1420 | |
Simon Glass | 4d979bf | 2019-12-28 10:45:10 -0700 | [diff] [blame] | 1421 | - MEM_SUPPORT_64BIT_DATA: Defined automatically if compiled as 64-bit. |
York Sun | 4d1fd7f | 2014-02-26 17:03:19 -0800 | [diff] [blame] | 1422 | Optionally it can be defined to support 64-bit memory commands. |
| 1423 | |
Jean-Christophe PLAGNIOL-VILLARD | 6d0f6bc | 2008-10-16 15:01:15 +0200 | [diff] [blame] | 1424 | - CONFIG_SYS_LONGHELP: Defined when you want long help messages included; |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1425 | undefine this when you're short of memory. |
| 1426 | |
Peter Tyser | 2fb2604 | 2009-01-27 18:03:12 -0600 | [diff] [blame] | 1427 | - CONFIG_SYS_HELP_CMD_WIDTH: Defined when you want to override the default |
| 1428 | width of the commands listed in the 'help' command output. |
| 1429 | |
Jean-Christophe PLAGNIOL-VILLARD | 6d0f6bc | 2008-10-16 15:01:15 +0200 | [diff] [blame] | 1430 | - CONFIG_SYS_PROMPT: This is what U-Boot prints on the console to |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1431 | prompt for user input. |
| 1432 | |
Jean-Christophe PLAGNIOL-VILLARD | 6d0f6bc | 2008-10-16 15:01:15 +0200 | [diff] [blame] | 1433 | - CONFIG_SYS_BAUDRATE_TABLE: |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1434 | List of legal baudrate settings for this board. |
| 1435 | |
York Sun | e814952 | 2015-12-04 11:57:07 -0800 | [diff] [blame] | 1436 | - CONFIG_SYS_MEM_RESERVE_SECURE |
York Sun | e61a753 | 2016-06-24 16:46:18 -0700 | [diff] [blame] | 1437 | Only implemented for ARMv8 for now. |
York Sun | e814952 | 2015-12-04 11:57:07 -0800 | [diff] [blame] | 1438 | If defined, the size of CONFIG_SYS_MEM_RESERVE_SECURE memory |
| 1439 | is substracted from total RAM and won't be reported to OS. |
| 1440 | This memory can be used as secure memory. A variable |
York Sun | e61a753 | 2016-06-24 16:46:18 -0700 | [diff] [blame] | 1441 | gd->arch.secure_ram is used to track the location. In systems |
York Sun | e814952 | 2015-12-04 11:57:07 -0800 | [diff] [blame] | 1442 | the RAM base is not zero, or RAM is divided into banks, |
| 1443 | this variable needs to be recalcuated to get the address. |
| 1444 | |
Jean-Christophe PLAGNIOL-VILLARD | 6d0f6bc | 2008-10-16 15:01:15 +0200 | [diff] [blame] | 1445 | - CONFIG_SYS_SDRAM_BASE: |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1446 | Physical start address of SDRAM. _Must_ be 0 here. |
| 1447 | |
Jean-Christophe PLAGNIOL-VILLARD | 6d0f6bc | 2008-10-16 15:01:15 +0200 | [diff] [blame] | 1448 | - CONFIG_SYS_FLASH_BASE: |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1449 | Physical start address of Flash memory. |
| 1450 | |
Jean-Christophe PLAGNIOL-VILLARD | 6d0f6bc | 2008-10-16 15:01:15 +0200 | [diff] [blame] | 1451 | - CONFIG_SYS_MALLOC_LEN: |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1452 | Size of DRAM reserved for malloc() use. |
| 1453 | |
Simon Glass | d59476b | 2014-07-10 22:23:28 -0600 | [diff] [blame] | 1454 | - CONFIG_SYS_MALLOC_F_LEN |
| 1455 | Size of the malloc() pool for use before relocation. If |
| 1456 | this is defined, then a very simple malloc() implementation |
| 1457 | will become available before relocation. The address is just |
| 1458 | below the global data, and the stack is moved down to make |
| 1459 | space. |
| 1460 | |
| 1461 | This feature allocates regions with increasing addresses |
| 1462 | within the region. calloc() is supported, but realloc() |
| 1463 | is not available. free() is supported but does nothing. |
Jeremiah Mahler | b445bbb | 2015-01-04 18:56:50 -0800 | [diff] [blame] | 1464 | The memory will be freed (or in fact just forgotten) when |
Simon Glass | d59476b | 2014-07-10 22:23:28 -0600 | [diff] [blame] | 1465 | U-Boot relocates itself. |
| 1466 | |
Simon Glass | 38687ae | 2014-11-10 17:16:54 -0700 | [diff] [blame] | 1467 | - CONFIG_SYS_MALLOC_SIMPLE |
| 1468 | Provides a simple and small malloc() and calloc() for those |
| 1469 | boards which do not use the full malloc in SPL (which is |
Tom Rini | 10f6e4d | 2022-05-27 12:48:32 -0400 | [diff] [blame] | 1470 | enabled with CONFIG_SYS_SPL_MALLOC). |
Simon Glass | 38687ae | 2014-11-10 17:16:54 -0700 | [diff] [blame] | 1471 | |
Jean-Christophe PLAGNIOL-VILLARD | 6d0f6bc | 2008-10-16 15:01:15 +0200 | [diff] [blame] | 1472 | - CONFIG_SYS_BOOTMAPSZ: |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1473 | Maximum size of memory mapped by the startup code of |
| 1474 | the Linux kernel; all data that must be processed by |
Bartlomiej Sieka | 7d721e3 | 2008-04-14 15:44:16 +0200 | [diff] [blame] | 1475 | the Linux kernel (bd_info, boot arguments, FDT blob if |
| 1476 | used) must be put below this limit, unless "bootm_low" |
Robert P. J. Day | 1bce2ae | 2013-09-16 07:15:45 -0400 | [diff] [blame] | 1477 | environment variable is defined and non-zero. In such case |
Bartlomiej Sieka | 7d721e3 | 2008-04-14 15:44:16 +0200 | [diff] [blame] | 1478 | all data for the Linux kernel must be between "bootm_low" |
Wolfgang Denk | c0f4085 | 2011-10-26 10:21:21 +0000 | [diff] [blame] | 1479 | and "bootm_low" + CONFIG_SYS_BOOTMAPSZ. The environment |
Grant Likely | c3624e6 | 2011-03-28 09:58:43 +0000 | [diff] [blame] | 1480 | variable "bootm_mapsize" will override the value of |
| 1481 | CONFIG_SYS_BOOTMAPSZ. If CONFIG_SYS_BOOTMAPSZ is undefined, |
| 1482 | then the value in "bootm_size" will be used instead. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1483 | |
John Rigby | fca43cc | 2010-10-13 13:57:35 -0600 | [diff] [blame] | 1484 | - CONFIG_SYS_BOOT_GET_CMDLINE: |
| 1485 | Enables allocating and saving kernel cmdline in space between |
| 1486 | "bootm_low" and "bootm_low" + BOOTMAPSZ. |
| 1487 | |
| 1488 | - CONFIG_SYS_BOOT_GET_KBD: |
| 1489 | Enables allocating and saving a kernel copy of the bd_info in |
| 1490 | space between "bootm_low" and "bootm_low" + BOOTMAPSZ. |
| 1491 | |
Jean-Christophe PLAGNIOL-VILLARD | 6d0f6bc | 2008-10-16 15:01:15 +0200 | [diff] [blame] | 1492 | - CONFIG_SYS_FLASH_PROTECTION |
wdenk | 8564acf | 2003-07-14 22:13:32 +0000 | [diff] [blame] | 1493 | If defined, hardware flash sectors protection is used |
| 1494 | instead of U-Boot software protection. |
| 1495 | |
Jean-Christophe PLAGNIOL-VILLARD | 6d0f6bc | 2008-10-16 15:01:15 +0200 | [diff] [blame] | 1496 | - CONFIG_SYS_FLASH_CFI: |
wdenk | 43d9616 | 2003-03-06 00:02:04 +0000 | [diff] [blame] | 1497 | Define if the flash driver uses extra elements in the |
wdenk | 5653fc3 | 2004-02-08 22:55:38 +0000 | [diff] [blame] | 1498 | common flash structure for storing flash geometry. |
| 1499 | |
Jean-Christophe PLAGNIOL-VILLARD | 00b1883 | 2008-08-13 01:40:42 +0200 | [diff] [blame] | 1500 | - CONFIG_FLASH_CFI_DRIVER |
wdenk | 5653fc3 | 2004-02-08 22:55:38 +0000 | [diff] [blame] | 1501 | This option also enables the building of the cfi_flash driver |
| 1502 | in the drivers directory |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1503 | |
Piotr Ziecik | 91809ed | 2008-11-17 15:57:58 +0100 | [diff] [blame] | 1504 | - CONFIG_FLASH_CFI_MTD |
| 1505 | This option enables the building of the cfi_mtd driver |
| 1506 | in the drivers directory. The driver exports CFI flash |
| 1507 | to the MTD layer. |
| 1508 | |
Jean-Christophe PLAGNIOL-VILLARD | 6d0f6bc | 2008-10-16 15:01:15 +0200 | [diff] [blame] | 1509 | - CONFIG_SYS_FLASH_USE_BUFFER_WRITE |
Guennadi Liakhovetski | 96ef831 | 2008-04-03 13:36:02 +0200 | [diff] [blame] | 1510 | Use buffered writes to flash. |
| 1511 | |
| 1512 | - CONFIG_FLASH_SPANSION_S29WS_N |
| 1513 | s29ws-n MirrorBit flash has non-standard addresses for buffered |
| 1514 | write commands. |
| 1515 | |
Jerry Van Baren | 9a042e9 | 2008-03-08 13:48:01 -0500 | [diff] [blame] | 1516 | - CONFIG_FLASH_SHOW_PROGRESS |
| 1517 | If defined (must be an integer), print out countdown |
| 1518 | digits and dots. Recommended value: 45 (9..1) for 80 |
| 1519 | column displays, 15 (3..1) for 40 column displays. |
| 1520 | |
Stefan Roese | 352ef3f | 2013-04-04 15:53:14 +0200 | [diff] [blame] | 1521 | - CONFIG_FLASH_VERIFY |
| 1522 | If defined, the content of the flash (destination) is compared |
| 1523 | against the source after the write operation. An error message |
| 1524 | will be printed when the contents are not identical. |
| 1525 | Please note that this option is useless in nearly all cases, |
| 1526 | since such flash programming errors usually are detected earlier |
| 1527 | while unprotecting/erasing/programming. Please only enable |
| 1528 | this option if you really know what you are doing. |
| 1529 | |
Joe Hershberger | 2598090 | 2012-12-11 22:16:31 -0600 | [diff] [blame] | 1530 | - CONFIG_ENV_FLAGS_LIST_DEFAULT |
| 1531 | - CONFIG_ENV_FLAGS_LIST_STATIC |
Robert P. J. Day | 1bce2ae | 2013-09-16 07:15:45 -0400 | [diff] [blame] | 1532 | Enable validation of the values given to environment variables when |
Joe Hershberger | 2598090 | 2012-12-11 22:16:31 -0600 | [diff] [blame] | 1533 | calling env set. Variables can be restricted to only decimal, |
| 1534 | hexadecimal, or boolean. If CONFIG_CMD_NET is also defined, |
| 1535 | the variables can also be restricted to IP address or MAC address. |
| 1536 | |
| 1537 | The format of the list is: |
| 1538 | type_attribute = [s|d|x|b|i|m] |
Jeremiah Mahler | b445bbb | 2015-01-04 18:56:50 -0800 | [diff] [blame] | 1539 | access_attribute = [a|r|o|c] |
| 1540 | attributes = type_attribute[access_attribute] |
Joe Hershberger | 2598090 | 2012-12-11 22:16:31 -0600 | [diff] [blame] | 1541 | entry = variable_name[:attributes] |
| 1542 | list = entry[,list] |
| 1543 | |
| 1544 | The type attributes are: |
| 1545 | s - String (default) |
| 1546 | d - Decimal |
| 1547 | x - Hexadecimal |
| 1548 | b - Boolean ([1yYtT|0nNfF]) |
| 1549 | i - IP address |
| 1550 | m - MAC address |
| 1551 | |
Joe Hershberger | 267541f | 2012-12-11 22:16:34 -0600 | [diff] [blame] | 1552 | The access attributes are: |
| 1553 | a - Any (default) |
| 1554 | r - Read-only |
| 1555 | o - Write-once |
| 1556 | c - Change-default |
| 1557 | |
Joe Hershberger | 2598090 | 2012-12-11 22:16:31 -0600 | [diff] [blame] | 1558 | - CONFIG_ENV_FLAGS_LIST_DEFAULT |
| 1559 | Define this to a list (string) to define the ".flags" |
Jeremiah Mahler | b445bbb | 2015-01-04 18:56:50 -0800 | [diff] [blame] | 1560 | environment variable in the default or embedded environment. |
Joe Hershberger | 2598090 | 2012-12-11 22:16:31 -0600 | [diff] [blame] | 1561 | |
| 1562 | - CONFIG_ENV_FLAGS_LIST_STATIC |
| 1563 | Define this to a list (string) to define validation that |
| 1564 | should be done if an entry is not found in the ".flags" |
| 1565 | environment variable. To override a setting in the static |
| 1566 | list, simply add an entry for the same variable name to the |
| 1567 | ".flags" variable. |
| 1568 | |
Joe Hershberger | bdf1fe4 | 2015-05-20 14:27:20 -0500 | [diff] [blame] | 1569 | If CONFIG_REGEX is defined, the variable_name above is evaluated as a |
| 1570 | regular expression. This allows multiple variables to define the same |
| 1571 | flags without explicitly listing them for each variable. |
| 1572 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1573 | The following definitions that deal with the placement and management |
| 1574 | of environment data (variable area); in general, we support the |
| 1575 | following configurations: |
| 1576 | |
Mike Frysinger | c3eb3fe | 2011-07-08 10:44:25 +0000 | [diff] [blame] | 1577 | - CONFIG_BUILD_ENVCRC: |
| 1578 | |
| 1579 | Builds up envcrc with the target environment so that external utils |
| 1580 | may easily extract it and embed it in final U-Boot images. |
| 1581 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1582 | BE CAREFUL! The first access to the environment happens quite early |
Jeremiah Mahler | b445bbb | 2015-01-04 18:56:50 -0800 | [diff] [blame] | 1583 | in U-Boot initialization (when we try to get the setting of for the |
Marcel Ziswiler | 11ccc33 | 2008-07-09 08:17:15 +0200 | [diff] [blame] | 1584 | console baudrate). You *MUST* have mapped your NVRAM area then, or |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1585 | U-Boot will hang. |
| 1586 | |
| 1587 | Please note that even with NVRAM we still use a copy of the |
| 1588 | environment in RAM: we could work on NVRAM directly, but we want to |
| 1589 | keep settings there always unmodified except somebody uses "saveenv" |
| 1590 | to save the current settings. |
| 1591 | |
Liu Gang | 0a85a9e | 2012-03-08 00:33:20 +0000 | [diff] [blame] | 1592 | BE CAREFUL! For some special cases, the local device can not use |
| 1593 | "saveenv" command. For example, the local device will get the |
Liu Gang | fc54c7f | 2012-08-09 05:10:01 +0000 | [diff] [blame] | 1594 | environment stored in a remote NOR flash by SRIO or PCIE link, |
| 1595 | but it can not erase, write this NOR flash by SRIO or PCIE interface. |
Liu Gang | 0a85a9e | 2012-03-08 00:33:20 +0000 | [diff] [blame] | 1596 | |
Guennadi Liakhovetski | b74ab73 | 2009-05-18 16:07:22 +0200 | [diff] [blame] | 1597 | - CONFIG_NAND_ENV_DST |
| 1598 | |
| 1599 | Defines address in RAM to which the nand_spl code should copy the |
| 1600 | environment. If redundant environment is used, it will be copied to |
| 1601 | CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE. |
| 1602 | |
Bruce Adler | e881cb5 | 2007-11-02 13:15:42 -0700 | [diff] [blame] | 1603 | Please note that the environment is read-only until the monitor |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1604 | has been relocated to RAM and a RAM copy of the environment has been |
Simon Glass | 00caae6 | 2017-08-03 12:22:12 -0600 | [diff] [blame] | 1605 | created; also, when using EEPROM you will have to use env_get_f() |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1606 | until then to read environment variables. |
| 1607 | |
wdenk | 85ec0bc | 2003-03-31 16:34:49 +0000 | [diff] [blame] | 1608 | The environment is protected by a CRC32 checksum. Before the monitor |
| 1609 | is relocated into RAM, as a result of a bad CRC you will be working |
| 1610 | with the compiled-in default environment - *silently*!!! [This is |
| 1611 | necessary, because the first environment variable we need is the |
| 1612 | "baudrate" setting for the console - if we have a bad CRC, we don't |
| 1613 | have any device yet where we could complain.] |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1614 | |
| 1615 | Note: once the monitor has been relocated, then it will complain if |
| 1616 | the default environment is used; a new CRC is computed as soon as you |
wdenk | 85ec0bc | 2003-03-31 16:34:49 +0000 | [diff] [blame] | 1617 | use the "saveenv" command to store a valid environment. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1618 | |
Jean-Christophe PLAGNIOL-VILLARD | 6d0f6bc | 2008-10-16 15:01:15 +0200 | [diff] [blame] | 1619 | - CONFIG_SYS_FAULT_MII_ADDR: |
wdenk | 42d1f03 | 2003-10-15 23:53:47 +0000 | [diff] [blame] | 1620 | MII address of the PHY to check for the Ethernet link state. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1621 | |
Simon Glass | b2b92f5 | 2012-11-30 13:01:18 +0000 | [diff] [blame] | 1622 | - CONFIG_DISPLAY_BOARDINFO |
| 1623 | Display information about the board that U-Boot is running on |
| 1624 | when U-Boot starts up. The board function checkboard() is called |
| 1625 | to do this. |
| 1626 | |
Simon Glass | e2e3e2b | 2012-11-30 13:01:19 +0000 | [diff] [blame] | 1627 | - CONFIG_DISPLAY_BOARDINFO_LATE |
| 1628 | Similar to the previous option, but display this information |
| 1629 | later, once stdio is running and output goes to the LCD, if |
| 1630 | present. |
| 1631 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1632 | Low Level (hardware related) configuration options: |
wdenk | dc7c9a1 | 2003-03-26 06:55:25 +0000 | [diff] [blame] | 1633 | --------------------------------------------------- |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1634 | |
Jean-Christophe PLAGNIOL-VILLARD | 6d0f6bc | 2008-10-16 15:01:15 +0200 | [diff] [blame] | 1635 | - CONFIG_SYS_CACHELINE_SIZE: |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1636 | Cache Line Size of the CPU. |
| 1637 | |
Timur Tabi | e46fedf | 2011-08-04 18:03:41 -0500 | [diff] [blame] | 1638 | - CONFIG_SYS_CCSRBAR_DEFAULT: |
| 1639 | Default (power-on reset) physical address of CCSR on Freescale |
| 1640 | PowerPC SOCs. |
| 1641 | |
| 1642 | - CONFIG_SYS_CCSRBAR: |
| 1643 | Virtual address of CCSR. On a 32-bit build, this is typically |
| 1644 | the same value as CONFIG_SYS_CCSRBAR_DEFAULT. |
| 1645 | |
Timur Tabi | e46fedf | 2011-08-04 18:03:41 -0500 | [diff] [blame] | 1646 | - CONFIG_SYS_CCSRBAR_PHYS: |
| 1647 | Physical address of CCSR. CCSR can be relocated to a new |
| 1648 | physical address, if desired. In this case, this macro should |
Wolfgang Denk | c0f4085 | 2011-10-26 10:21:21 +0000 | [diff] [blame] | 1649 | be set to that address. Otherwise, it should be set to the |
Timur Tabi | e46fedf | 2011-08-04 18:03:41 -0500 | [diff] [blame] | 1650 | same value as CONFIG_SYS_CCSRBAR_DEFAULT. For example, CCSR |
| 1651 | is typically relocated on 36-bit builds. It is recommended |
| 1652 | that this macro be defined via the _HIGH and _LOW macros: |
| 1653 | |
| 1654 | #define CONFIG_SYS_CCSRBAR_PHYS ((CONFIG_SYS_CCSRBAR_PHYS_HIGH |
| 1655 | * 1ull) << 32 | CONFIG_SYS_CCSRBAR_PHYS_LOW) |
| 1656 | |
| 1657 | - CONFIG_SYS_CCSRBAR_PHYS_HIGH: |
Wolfgang Denk | 4cf2609 | 2011-10-07 09:58:21 +0200 | [diff] [blame] | 1658 | Bits 33-36 of CONFIG_SYS_CCSRBAR_PHYS. This value is typically |
| 1659 | either 0 (32-bit build) or 0xF (36-bit build). This macro is |
Timur Tabi | e46fedf | 2011-08-04 18:03:41 -0500 | [diff] [blame] | 1660 | used in assembly code, so it must not contain typecasts or |
| 1661 | integer size suffixes (e.g. "ULL"). |
| 1662 | |
| 1663 | - CONFIG_SYS_CCSRBAR_PHYS_LOW: |
| 1664 | Lower 32-bits of CONFIG_SYS_CCSRBAR_PHYS. This macro is |
| 1665 | used in assembly code, so it must not contain typecasts or |
| 1666 | integer size suffixes (e.g. "ULL"). |
| 1667 | |
Jean-Christophe PLAGNIOL-VILLARD | 6d0f6bc | 2008-10-16 15:01:15 +0200 | [diff] [blame] | 1668 | - CONFIG_SYS_IMMR: Physical address of the Internal Memory. |
wdenk | efe2a4d | 2004-12-16 21:44:03 +0000 | [diff] [blame] | 1669 | DO NOT CHANGE unless you know exactly what you're |
Christophe Leroy | 907208c | 2017-07-06 10:23:22 +0200 | [diff] [blame] | 1670 | doing! (11-4) [MPC8xx systems only] |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1671 | |
Jean-Christophe PLAGNIOL-VILLARD | 6d0f6bc | 2008-10-16 15:01:15 +0200 | [diff] [blame] | 1672 | - CONFIG_SYS_INIT_RAM_ADDR: |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1673 | |
wdenk | 7152b1d | 2003-09-05 23:19:14 +0000 | [diff] [blame] | 1674 | Start address of memory area that can be used for |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1675 | initial data and stack; please note that this must be |
| 1676 | writable memory that is working WITHOUT special |
| 1677 | initialization, i. e. you CANNOT use normal RAM which |
| 1678 | will become available only after programming the |
| 1679 | memory controller and running certain initialization |
| 1680 | sequences. |
| 1681 | |
| 1682 | U-Boot uses the following memory types: |
Christophe Leroy | 907208c | 2017-07-06 10:23:22 +0200 | [diff] [blame] | 1683 | - MPC8xx: IMMR (internal memory of the CPU) |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1684 | |
Jean-Christophe PLAGNIOL-VILLARD | 6d0f6bc | 2008-10-16 15:01:15 +0200 | [diff] [blame] | 1685 | - CONFIG_SYS_SCCR: System Clock and reset Control Register (15-27) |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1686 | |
Jean-Christophe PLAGNIOL-VILLARD | 6d0f6bc | 2008-10-16 15:01:15 +0200 | [diff] [blame] | 1687 | - CONFIG_SYS_OR_TIMING_SDRAM: |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1688 | SDRAM timing |
| 1689 | |
Kumar Gala | a09b9b6 | 2010-12-30 12:09:53 -0600 | [diff] [blame] | 1690 | - CONFIG_SYS_SRIO: |
| 1691 | Chip has SRIO or not |
| 1692 | |
| 1693 | - CONFIG_SRIO1: |
| 1694 | Board has SRIO 1 port available |
| 1695 | |
| 1696 | - CONFIG_SRIO2: |
| 1697 | Board has SRIO 2 port available |
| 1698 | |
Liu Gang | c8b2815 | 2013-05-07 16:30:46 +0800 | [diff] [blame] | 1699 | - CONFIG_SRIO_PCIE_BOOT_MASTER |
| 1700 | Board can support master function for Boot from SRIO and PCIE |
| 1701 | |
Kumar Gala | a09b9b6 | 2010-12-30 12:09:53 -0600 | [diff] [blame] | 1702 | - CONFIG_SYS_SRIOn_MEM_VIRT: |
| 1703 | Virtual Address of SRIO port 'n' memory region |
| 1704 | |
Simon Glass | 62f9b65 | 2019-11-14 12:57:09 -0700 | [diff] [blame] | 1705 | - CONFIG_SYS_SRIOn_MEM_PHYxS: |
Kumar Gala | a09b9b6 | 2010-12-30 12:09:53 -0600 | [diff] [blame] | 1706 | Physical Address of SRIO port 'n' memory region |
| 1707 | |
| 1708 | - CONFIG_SYS_SRIOn_MEM_SIZE: |
| 1709 | Size of SRIO port 'n' memory region |
| 1710 | |
Fabio Estevam | 66bd184 | 2013-04-11 09:35:34 +0000 | [diff] [blame] | 1711 | - CONFIG_SYS_NAND_BUSWIDTH_16BIT |
| 1712 | Defined to tell the NAND controller that the NAND chip is using |
| 1713 | a 16 bit bus. |
| 1714 | Not all NAND drivers use this symbol. |
Fabio Estevam | a430e91 | 2013-04-11 09:35:35 +0000 | [diff] [blame] | 1715 | Example of drivers that use it: |
Miquel Raynal | a430fa0 | 2018-08-16 17:30:07 +0200 | [diff] [blame] | 1716 | - drivers/mtd/nand/raw/ndfc.c |
| 1717 | - drivers/mtd/nand/raw/mxc_nand.c |
Alex Waterman | eced462 | 2011-05-19 15:08:36 -0400 | [diff] [blame] | 1718 | |
| 1719 | - CONFIG_SYS_NDFC_EBC0_CFG |
| 1720 | Sets the EBC0_CFG register for the NDFC. If not defined |
| 1721 | a default value will be used. |
| 1722 | |
Ben Warren | bb99ad6 | 2006-09-07 16:50:54 -0400 | [diff] [blame] | 1723 | - CONFIG_SPD_EEPROM |
Wolfgang Denk | 218ca72 | 2008-03-26 10:40:12 +0100 | [diff] [blame] | 1724 | Get DDR timing information from an I2C EEPROM. Common |
| 1725 | with pluggable memory modules such as SODIMMs |
| 1726 | |
Ben Warren | bb99ad6 | 2006-09-07 16:50:54 -0400 | [diff] [blame] | 1727 | SPD_EEPROM_ADDRESS |
| 1728 | I2C address of the SPD EEPROM |
| 1729 | |
Jean-Christophe PLAGNIOL-VILLARD | 6d0f6bc | 2008-10-16 15:01:15 +0200 | [diff] [blame] | 1730 | - CONFIG_SYS_SPD_BUS_NUM |
Wolfgang Denk | 218ca72 | 2008-03-26 10:40:12 +0100 | [diff] [blame] | 1731 | If SPD EEPROM is on an I2C bus other than the first |
| 1732 | one, specify here. Note that the value must resolve |
| 1733 | to something your driver can deal with. |
Ben Warren | bb99ad6 | 2006-09-07 16:50:54 -0400 | [diff] [blame] | 1734 | |
York Sun | 6f5e1dc | 2011-09-16 13:21:35 -0700 | [diff] [blame] | 1735 | - CONFIG_FSL_DDR_INTERACTIVE |
| 1736 | Enable interactive DDR debugging. See doc/README.fsl-ddr. |
| 1737 | |
York Sun | e32d59a | 2015-01-06 13:18:55 -0800 | [diff] [blame] | 1738 | - CONFIG_FSL_DDR_SYNC_REFRESH |
| 1739 | Enable sync of refresh for multiple controllers. |
| 1740 | |
York Sun | 4516ff8 | 2015-03-19 09:30:28 -0700 | [diff] [blame] | 1741 | - CONFIG_FSL_DDR_BIST |
| 1742 | Enable built-in memory test for Freescale DDR controllers. |
| 1743 | |
wdenk | c26e454 | 2004-04-18 10:13:26 +0000 | [diff] [blame] | 1744 | - CONFIG_RMII |
| 1745 | Enable RMII mode for all FECs. |
| 1746 | Note that this is a global option, we can't |
| 1747 | have one FEC in standard MII mode and another in RMII mode. |
| 1748 | |
wdenk | 5cf91d6 | 2004-04-23 20:32:05 +0000 | [diff] [blame] | 1749 | - CONFIG_CRC32_VERIFY |
| 1750 | Add a verify option to the crc32 command. |
| 1751 | The syntax is: |
| 1752 | |
| 1753 | => crc32 -v <address> <count> <crc32> |
| 1754 | |
| 1755 | Where address/count indicate a memory area |
| 1756 | and crc32 is the correct crc32 which the |
| 1757 | area should have. |
| 1758 | |
wdenk | 56523f1 | 2004-07-11 17:40:54 +0000 | [diff] [blame] | 1759 | - CONFIG_LOOPW |
| 1760 | Add the "loopw" memory command. This only takes effect if |
Simon Glass | 493f420 | 2017-08-04 16:34:27 -0600 | [diff] [blame] | 1761 | the memory commands are activated globally (CONFIG_CMD_MEMORY). |
wdenk | 56523f1 | 2004-07-11 17:40:54 +0000 | [diff] [blame] | 1762 | |
Joel Johnson | 7273231 | 2020-01-29 09:17:18 -0700 | [diff] [blame] | 1763 | - CONFIG_CMD_MX_CYCLIC |
stroese | 7b46664 | 2004-12-16 18:46:55 +0000 | [diff] [blame] | 1764 | Add the "mdc" and "mwc" memory commands. These are cyclic |
| 1765 | "md/mw" commands. |
| 1766 | Examples: |
| 1767 | |
wdenk | efe2a4d | 2004-12-16 21:44:03 +0000 | [diff] [blame] | 1768 | => mdc.b 10 4 500 |
stroese | 7b46664 | 2004-12-16 18:46:55 +0000 | [diff] [blame] | 1769 | This command will print 4 bytes (10,11,12,13) each 500 ms. |
| 1770 | |
wdenk | efe2a4d | 2004-12-16 21:44:03 +0000 | [diff] [blame] | 1771 | => mwc.l 100 12345678 10 |
stroese | 7b46664 | 2004-12-16 18:46:55 +0000 | [diff] [blame] | 1772 | This command will write 12345678 to address 100 all 10 ms. |
| 1773 | |
wdenk | efe2a4d | 2004-12-16 21:44:03 +0000 | [diff] [blame] | 1774 | This only takes effect if the memory commands are activated |
Simon Glass | 493f420 | 2017-08-04 16:34:27 -0600 | [diff] [blame] | 1775 | globally (CONFIG_CMD_MEMORY). |
stroese | 7b46664 | 2004-12-16 18:46:55 +0000 | [diff] [blame] | 1776 | |
Aneesh V | 401bb30 | 2011-07-13 05:11:07 +0000 | [diff] [blame] | 1777 | - CONFIG_SPL_BUILD |
Thomas Hebb | 32f2ca2 | 2019-11-13 18:18:03 -0800 | [diff] [blame] | 1778 | Set when the currently-running compilation is for an artifact |
| 1779 | that will end up in the SPL (as opposed to the TPL or U-Boot |
| 1780 | proper). Code that needs stage-specific behavior should check |
| 1781 | this. |
wdenk | 400558b | 2005-04-02 23:52:25 +0000 | [diff] [blame] | 1782 | |
Ying Zhang | 3aa29de | 2013-08-16 15:16:15 +0800 | [diff] [blame] | 1783 | - CONFIG_TPL_BUILD |
Thomas Hebb | 32f2ca2 | 2019-11-13 18:18:03 -0800 | [diff] [blame] | 1784 | Set when the currently-running compilation is for an artifact |
| 1785 | that will end up in the TPL (as opposed to the SPL or U-Boot |
| 1786 | proper). Code that needs stage-specific behavior should check |
| 1787 | this. |
Ying Zhang | 3aa29de | 2013-08-16 15:16:15 +0800 | [diff] [blame] | 1788 | |
Simon Glass | 4213fc2 | 2013-02-24 17:33:14 +0000 | [diff] [blame] | 1789 | - CONFIG_ARCH_MAP_SYSMEM |
| 1790 | Generally U-Boot (and in particular the md command) uses |
| 1791 | effective address. It is therefore not necessary to regard |
| 1792 | U-Boot address as virtual addresses that need to be translated |
| 1793 | to physical addresses. However, sandbox requires this, since |
| 1794 | it maintains its own little RAM buffer which contains all |
| 1795 | addressable memory. This option causes some memory accesses |
| 1796 | to be mapped through map_sysmem() / unmap_sysmem(). |
| 1797 | |
Simon Glass | 588a13f | 2013-02-14 04:18:54 +0000 | [diff] [blame] | 1798 | - CONFIG_X86_RESET_VECTOR |
| 1799 | If defined, the x86 reset vector code is included. This is not |
| 1800 | needed when U-Boot is running from Coreboot. |
Gabe Black | b16f521 | 2012-11-27 21:08:06 +0000 | [diff] [blame] | 1801 | |
Timur Tabi | f2717b4 | 2011-11-22 09:21:25 -0600 | [diff] [blame] | 1802 | Freescale QE/FMAN Firmware Support: |
| 1803 | ----------------------------------- |
| 1804 | |
| 1805 | The Freescale QUICCEngine (QE) and Frame Manager (FMAN) both support the |
| 1806 | loading of "firmware", which is encoded in the QE firmware binary format. |
| 1807 | This firmware often needs to be loaded during U-Boot booting, so macros |
| 1808 | are used to identify the storage device (NOR flash, SPI, etc) and the address |
| 1809 | within that device. |
| 1810 | |
Zhao Qiang | dcf1d77 | 2014-03-21 16:21:44 +0800 | [diff] [blame] | 1811 | - CONFIG_SYS_FMAN_FW_ADDR |
| 1812 | The address in the storage device where the FMAN microcode is located. The |
Tom Rini | cc1e98b | 2019-05-12 07:59:12 -0400 | [diff] [blame] | 1813 | meaning of this address depends on which CONFIG_SYS_QE_FMAN_FW_IN_xxx macro |
Zhao Qiang | dcf1d77 | 2014-03-21 16:21:44 +0800 | [diff] [blame] | 1814 | is also specified. |
| 1815 | |
| 1816 | - CONFIG_SYS_QE_FW_ADDR |
| 1817 | The address in the storage device where the QE microcode is located. The |
Tom Rini | cc1e98b | 2019-05-12 07:59:12 -0400 | [diff] [blame] | 1818 | meaning of this address depends on which CONFIG_SYS_QE_FMAN_FW_IN_xxx macro |
Timur Tabi | f2717b4 | 2011-11-22 09:21:25 -0600 | [diff] [blame] | 1819 | is also specified. |
| 1820 | |
| 1821 | - CONFIG_SYS_QE_FMAN_FW_LENGTH |
| 1822 | The maximum possible size of the firmware. The firmware binary format |
| 1823 | has a field that specifies the actual size of the firmware, but it |
| 1824 | might not be possible to read any part of the firmware unless some |
| 1825 | local storage is allocated to hold the entire firmware first. |
| 1826 | |
| 1827 | - CONFIG_SYS_QE_FMAN_FW_IN_NOR |
| 1828 | Specifies that QE/FMAN firmware is located in NOR flash, mapped as |
| 1829 | normal addressable memory via the LBC. CONFIG_SYS_FMAN_FW_ADDR is the |
| 1830 | virtual address in NOR flash. |
| 1831 | |
| 1832 | - CONFIG_SYS_QE_FMAN_FW_IN_NAND |
| 1833 | Specifies that QE/FMAN firmware is located in NAND flash. |
| 1834 | CONFIG_SYS_FMAN_FW_ADDR is the offset within NAND flash. |
| 1835 | |
| 1836 | - CONFIG_SYS_QE_FMAN_FW_IN_MMC |
| 1837 | Specifies that QE/FMAN firmware is located on the primary SD/MMC |
| 1838 | device. CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device. |
| 1839 | |
Liu Gang | 292dc6c | 2012-03-08 00:33:18 +0000 | [diff] [blame] | 1840 | - CONFIG_SYS_QE_FMAN_FW_IN_REMOTE |
| 1841 | Specifies that QE/FMAN firmware is located in the remote (master) |
| 1842 | memory space. CONFIG_SYS_FMAN_FW_ADDR is a virtual address which |
Liu Gang | fc54c7f | 2012-08-09 05:10:01 +0000 | [diff] [blame] | 1843 | can be mapped from slave TLB->slave LAW->slave SRIO or PCIE outbound |
| 1844 | window->master inbound window->master LAW->the ucode address in |
| 1845 | master's memory space. |
Timur Tabi | f2717b4 | 2011-11-22 09:21:25 -0600 | [diff] [blame] | 1846 | |
J. German Rivera | b940ca6 | 2014-06-23 15:15:55 -0700 | [diff] [blame] | 1847 | Freescale Layerscape Management Complex Firmware Support: |
| 1848 | --------------------------------------------------------- |
| 1849 | The Freescale Layerscape Management Complex (MC) supports the loading of |
| 1850 | "firmware". |
| 1851 | This firmware often needs to be loaded during U-Boot booting, so macros |
| 1852 | are used to identify the storage device (NOR flash, SPI, etc) and the address |
| 1853 | within that device. |
| 1854 | |
| 1855 | - CONFIG_FSL_MC_ENET |
| 1856 | Enable the MC driver for Layerscape SoCs. |
| 1857 | |
Prabhakar Kushwaha | 5c05508 | 2015-06-02 10:55:52 +0530 | [diff] [blame] | 1858 | Freescale Layerscape Debug Server Support: |
| 1859 | ------------------------------------------- |
| 1860 | The Freescale Layerscape Debug Server Support supports the loading of |
| 1861 | "Debug Server firmware" and triggering SP boot-rom. |
| 1862 | This firmware often needs to be loaded during U-Boot booting. |
| 1863 | |
York Sun | c049214 | 2015-12-07 11:08:58 -0800 | [diff] [blame] | 1864 | - CONFIG_SYS_MC_RSV_MEM_ALIGN |
| 1865 | Define alignment of reserved memory MC requires |
Prabhakar Kushwaha | 5c05508 | 2015-06-02 10:55:52 +0530 | [diff] [blame] | 1866 | |
Paul Kocialkowski | f3f431a | 2015-07-26 18:48:15 +0200 | [diff] [blame] | 1867 | Reproducible builds |
| 1868 | ------------------- |
| 1869 | |
| 1870 | In order to achieve reproducible builds, timestamps used in the U-Boot build |
| 1871 | process have to be set to a fixed value. |
| 1872 | |
| 1873 | This is done using the SOURCE_DATE_EPOCH environment variable. |
| 1874 | SOURCE_DATE_EPOCH is to be set on the build host's shell, not as a configuration |
| 1875 | option for U-Boot or an environment variable in U-Boot. |
| 1876 | |
| 1877 | SOURCE_DATE_EPOCH should be set to a number of seconds since the epoch, in UTC. |
| 1878 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1879 | Building the Software: |
| 1880 | ====================== |
| 1881 | |
Wolfgang Denk | 218ca72 | 2008-03-26 10:40:12 +0100 | [diff] [blame] | 1882 | Building U-Boot has been tested in several native build environments |
| 1883 | and in many different cross environments. Of course we cannot support |
| 1884 | all possibly existing versions of cross development tools in all |
| 1885 | (potentially obsolete) versions. In case of tool chain problems we |
Naoki Hayama | 047f6ec | 2020-10-08 13:17:16 +0900 | [diff] [blame] | 1886 | recommend to use the ELDK (see https://www.denx.de/wiki/DULG/ELDK) |
Wolfgang Denk | 218ca72 | 2008-03-26 10:40:12 +0100 | [diff] [blame] | 1887 | which is extensively used to build and test U-Boot. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1888 | |
Wolfgang Denk | 218ca72 | 2008-03-26 10:40:12 +0100 | [diff] [blame] | 1889 | If you are not using a native environment, it is assumed that you |
| 1890 | have GNU cross compiling tools available in your path. In this case, |
| 1891 | you must set the environment variable CROSS_COMPILE in your shell. |
| 1892 | Note that no changes to the Makefile or any other source files are |
| 1893 | necessary. For example using the ELDK on a 4xx CPU, please enter: |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1894 | |
Wolfgang Denk | 218ca72 | 2008-03-26 10:40:12 +0100 | [diff] [blame] | 1895 | $ CROSS_COMPILE=ppc_4xx- |
| 1896 | $ export CROSS_COMPILE |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1897 | |
Wolfgang Denk | 218ca72 | 2008-03-26 10:40:12 +0100 | [diff] [blame] | 1898 | U-Boot is intended to be simple to build. After installing the |
| 1899 | sources you must configure U-Boot for one specific board type. This |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1900 | is done by typing: |
| 1901 | |
Holger Freyther | ab584d6 | 2014-08-04 09:26:05 +0200 | [diff] [blame] | 1902 | make NAME_defconfig |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1903 | |
Holger Freyther | ab584d6 | 2014-08-04 09:26:05 +0200 | [diff] [blame] | 1904 | where "NAME_defconfig" is the name of one of the existing configu- |
Heinrich Schuchardt | ecb3a0a | 2020-02-24 18:36:30 +0100 | [diff] [blame] | 1905 | rations; see configs/*_defconfig for supported names. |
wdenk | 54387ac | 2003-10-08 22:45:44 +0000 | [diff] [blame] | 1906 | |
Heinrich Schuchardt | ecb3a0a | 2020-02-24 18:36:30 +0100 | [diff] [blame] | 1907 | Note: for some boards special configuration names may exist; check if |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 1908 | additional information is available from the board vendor; for |
| 1909 | instance, the TQM823L systems are available without (standard) |
| 1910 | or with LCD support. You can select such additional "features" |
Marcel Ziswiler | 11ccc33 | 2008-07-09 08:17:15 +0200 | [diff] [blame] | 1911 | when choosing the configuration, i. e. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1912 | |
Holger Freyther | ab584d6 | 2014-08-04 09:26:05 +0200 | [diff] [blame] | 1913 | make TQM823L_defconfig |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 1914 | - will configure for a plain TQM823L, i. e. no LCD support |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1915 | |
Holger Freyther | ab584d6 | 2014-08-04 09:26:05 +0200 | [diff] [blame] | 1916 | make TQM823L_LCD_defconfig |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 1917 | - will configure for a TQM823L with U-Boot console on LCD |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1918 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 1919 | etc. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1920 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1921 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 1922 | Finally, type "make all", and you should get some working U-Boot |
| 1923 | images ready for download to / installation on your system: |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1924 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 1925 | - "u-boot.bin" is a raw binary image |
| 1926 | - "u-boot" is an image in ELF binary format |
| 1927 | - "u-boot.srec" is in Motorola S-Record format |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1928 | |
Marian Balakowicz | baf3124 | 2006-09-07 17:25:40 +0200 | [diff] [blame] | 1929 | By default the build is performed locally and the objects are saved |
| 1930 | in the source directory. One of the two methods can be used to change |
| 1931 | this behavior and build U-Boot to some external directory: |
| 1932 | |
| 1933 | 1. Add O= to the make command line invocations: |
| 1934 | |
| 1935 | make O=/tmp/build distclean |
Holger Freyther | ab584d6 | 2014-08-04 09:26:05 +0200 | [diff] [blame] | 1936 | make O=/tmp/build NAME_defconfig |
Marian Balakowicz | baf3124 | 2006-09-07 17:25:40 +0200 | [diff] [blame] | 1937 | make O=/tmp/build all |
| 1938 | |
Timo Ketola | adbba99 | 2014-11-06 14:39:05 +0200 | [diff] [blame] | 1939 | 2. Set environment variable KBUILD_OUTPUT to point to the desired location: |
Marian Balakowicz | baf3124 | 2006-09-07 17:25:40 +0200 | [diff] [blame] | 1940 | |
Timo Ketola | adbba99 | 2014-11-06 14:39:05 +0200 | [diff] [blame] | 1941 | export KBUILD_OUTPUT=/tmp/build |
Marian Balakowicz | baf3124 | 2006-09-07 17:25:40 +0200 | [diff] [blame] | 1942 | make distclean |
Holger Freyther | ab584d6 | 2014-08-04 09:26:05 +0200 | [diff] [blame] | 1943 | make NAME_defconfig |
Marian Balakowicz | baf3124 | 2006-09-07 17:25:40 +0200 | [diff] [blame] | 1944 | make all |
| 1945 | |
Timo Ketola | adbba99 | 2014-11-06 14:39:05 +0200 | [diff] [blame] | 1946 | Note that the command line "O=" setting overrides the KBUILD_OUTPUT environment |
Marian Balakowicz | baf3124 | 2006-09-07 17:25:40 +0200 | [diff] [blame] | 1947 | variable. |
| 1948 | |
Daniel Schwierzeck | 215bb1c | 2018-01-26 16:31:04 +0100 | [diff] [blame] | 1949 | User specific CPPFLAGS, AFLAGS and CFLAGS can be passed to the compiler by |
| 1950 | setting the according environment variables KCPPFLAGS, KAFLAGS and KCFLAGS. |
| 1951 | For example to treat all compiler warnings as errors: |
| 1952 | |
| 1953 | make KCFLAGS=-Werror |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1954 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 1955 | Please be aware that the Makefiles assume you are using GNU make, so |
| 1956 | for instance on NetBSD you might need to use "gmake" instead of |
| 1957 | native "make". |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1958 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1959 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 1960 | If the system board that you have is not listed, then you will need |
| 1961 | to port U-Boot to your hardware platform. To do this, follow these |
| 1962 | steps: |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1963 | |
Phil Sutter | 3c1496c | 2015-12-25 14:41:18 +0100 | [diff] [blame] | 1964 | 1. Create a new directory to hold your board specific code. Add any |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 1965 | files you need. In your board directory, you will need at least |
Phil Sutter | 3c1496c | 2015-12-25 14:41:18 +0100 | [diff] [blame] | 1966 | the "Makefile" and a "<board>.c". |
| 1967 | 2. Create a new configuration file "include/configs/<board>.h" for |
| 1968 | your board. |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 1969 | 3. If you're porting U-Boot to a new CPU, then also create a new |
| 1970 | directory to hold your CPU specific code. Add any files you need. |
Holger Freyther | ab584d6 | 2014-08-04 09:26:05 +0200 | [diff] [blame] | 1971 | 4. Run "make <board>_defconfig" with your new name. |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 1972 | 5. Type "make", and you should get a working "u-boot.srec" file |
| 1973 | to be installed on your target system. |
| 1974 | 6. Debug and solve any problems that might arise. |
| 1975 | [Of course, this last step is much harder than it sounds.] |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1976 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1977 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 1978 | Testing of U-Boot Modifications, Ports to New Hardware, etc.: |
| 1979 | ============================================================== |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1980 | |
Wolfgang Denk | 218ca72 | 2008-03-26 10:40:12 +0100 | [diff] [blame] | 1981 | If you have modified U-Boot sources (for instance added a new board |
| 1982 | or support for new devices, a new CPU, etc.) you are expected to |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 1983 | provide feedback to the other developers. The feedback normally takes |
Thomas Hebb | 32f2ca2 | 2019-11-13 18:18:03 -0800 | [diff] [blame] | 1984 | the form of a "patch", i.e. a context diff against a certain (latest |
Wolfgang Denk | 218ca72 | 2008-03-26 10:40:12 +0100 | [diff] [blame] | 1985 | official or latest in the git repository) version of U-Boot sources. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1986 | |
Wolfgang Denk | 218ca72 | 2008-03-26 10:40:12 +0100 | [diff] [blame] | 1987 | But before you submit such a patch, please verify that your modifi- |
| 1988 | cation did not break existing code. At least make sure that *ALL* of |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 1989 | the supported boards compile WITHOUT ANY compiler warnings. To do so, |
Simon Glass | 6de80f2 | 2016-07-27 20:33:08 -0600 | [diff] [blame] | 1990 | just run the buildman script (tools/buildman/buildman), which will |
| 1991 | configure and build U-Boot for ALL supported system. Be warned, this |
| 1992 | will take a while. Please see the buildman README, or run 'buildman -H' |
| 1993 | for documentation. |
Marian Balakowicz | baf3124 | 2006-09-07 17:25:40 +0200 | [diff] [blame] | 1994 | |
| 1995 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 1996 | See also "U-Boot Porting Guide" below. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1997 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 1998 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 1999 | Monitor Commands - Overview: |
| 2000 | ============================ |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2001 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2002 | go - start application at address 'addr' |
| 2003 | run - run commands in an environment variable |
| 2004 | bootm - boot application image from memory |
| 2005 | bootp - boot image via network using BootP/TFTP protocol |
Marek Vasut | 44f074c | 2012-03-14 21:52:45 +0000 | [diff] [blame] | 2006 | bootz - boot zImage from memory |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2007 | tftpboot- boot image via network using TFTP protocol |
| 2008 | and env variables "ipaddr" and "serverip" |
| 2009 | (and eventually "gatewayip") |
Simon Glass | 1fb7cd4 | 2011-10-24 18:00:07 +0000 | [diff] [blame] | 2010 | tftpput - upload a file via network using TFTP protocol |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2011 | rarpboot- boot image via network using RARP/TFTP protocol |
| 2012 | diskboot- boot from IDE devicebootd - boot default, i.e., run 'bootcmd' |
| 2013 | loads - load S-Record file over serial line |
| 2014 | loadb - load binary file over serial line (kermit mode) |
Rui Miguel Silva | bfef72e | 2022-05-11 10:55:40 +0100 | [diff] [blame] | 2015 | loadm - load binary blob from source address to destination address |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2016 | md - memory display |
| 2017 | mm - memory modify (auto-incrementing) |
| 2018 | nm - memory modify (constant address) |
| 2019 | mw - memory write (fill) |
Simon Glass | bdded20 | 2020-06-02 19:26:49 -0600 | [diff] [blame] | 2020 | ms - memory search |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2021 | cp - memory copy |
| 2022 | cmp - memory compare |
| 2023 | crc32 - checksum calculation |
Peter Tyser | 0f89c54 | 2009-04-18 22:34:03 -0500 | [diff] [blame] | 2024 | i2c - I2C sub-system |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2025 | sspi - SPI utility commands |
| 2026 | base - print or set address offset |
| 2027 | printenv- print environment variables |
Pragnesh Patel | 9e9a530 | 2020-12-22 11:30:05 +0530 | [diff] [blame] | 2028 | pwm - control pwm channels |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2029 | setenv - set environment variables |
| 2030 | saveenv - save environment variables to persistent storage |
| 2031 | protect - enable or disable FLASH write protection |
| 2032 | erase - erase FLASH memory |
| 2033 | flinfo - print FLASH memory information |
Karl O. Pinc | 10635af | 2012-08-03 05:57:21 +0000 | [diff] [blame] | 2034 | nand - NAND memory operations (see doc/README.nand) |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2035 | bdinfo - print Board Info structure |
| 2036 | iminfo - print header information for application image |
| 2037 | coninfo - print console devices and informations |
| 2038 | ide - IDE sub-system |
| 2039 | loop - infinite loop on address range |
wdenk | 56523f1 | 2004-07-11 17:40:54 +0000 | [diff] [blame] | 2040 | loopw - infinite write loop on address range |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2041 | mtest - simple RAM test |
| 2042 | icache - enable or disable instruction cache |
| 2043 | dcache - enable or disable data cache |
| 2044 | reset - Perform RESET of the CPU |
| 2045 | echo - echo args to console |
| 2046 | version - print monitor version |
| 2047 | help - print online help |
| 2048 | ? - alias for 'help' |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2049 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2050 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2051 | Monitor Commands - Detailed Description: |
| 2052 | ======================================== |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2053 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2054 | TODO. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2055 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2056 | For now: just type "help <command>". |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2057 | |
| 2058 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2059 | Note for Redundant Ethernet Interfaces: |
| 2060 | ======================================= |
wdenk | f07771c | 2003-05-28 08:06:31 +0000 | [diff] [blame] | 2061 | |
Marcel Ziswiler | 11ccc33 | 2008-07-09 08:17:15 +0200 | [diff] [blame] | 2062 | Some boards come with redundant Ethernet interfaces; U-Boot supports |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2063 | such configurations and is capable of automatic selection of a |
| 2064 | "working" interface when needed. MAC assignment works as follows: |
wdenk | f07771c | 2003-05-28 08:06:31 +0000 | [diff] [blame] | 2065 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2066 | Network interfaces are numbered eth0, eth1, eth2, ... Corresponding |
| 2067 | MAC addresses can be stored in the environment as "ethaddr" (=>eth0), |
| 2068 | "eth1addr" (=>eth1), "eth2addr", ... |
wdenk | f07771c | 2003-05-28 08:06:31 +0000 | [diff] [blame] | 2069 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2070 | If the network interface stores some valid MAC address (for instance |
| 2071 | in SROM), this is used as default address if there is NO correspon- |
| 2072 | ding setting in the environment; if the corresponding environment |
| 2073 | variable is set, this overrides the settings in the card; that means: |
wdenk | f07771c | 2003-05-28 08:06:31 +0000 | [diff] [blame] | 2074 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2075 | o If the SROM has a valid MAC address, and there is no address in the |
| 2076 | environment, the SROM's address is used. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2077 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2078 | o If there is no valid address in the SROM, and a definition in the |
| 2079 | environment exists, then the value from the environment variable is |
| 2080 | used. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2081 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2082 | o If both the SROM and the environment contain a MAC address, and |
| 2083 | both addresses are the same, this MAC address is used. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2084 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2085 | o If both the SROM and the environment contain a MAC address, and the |
| 2086 | addresses differ, the value from the environment is used and a |
| 2087 | warning is printed. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2088 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2089 | o If neither SROM nor the environment contain a MAC address, an error |
Joe Hershberger | bef1014 | 2015-05-04 14:55:13 -0500 | [diff] [blame] | 2090 | is raised. If CONFIG_NET_RANDOM_ETHADDR is defined, then in this case |
| 2091 | a random, locally-assigned MAC is used. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2092 | |
Ben Warren | ecee932 | 2010-04-26 11:11:46 -0700 | [diff] [blame] | 2093 | If Ethernet drivers implement the 'write_hwaddr' function, valid MAC addresses |
Wolfgang Denk | c0f4085 | 2011-10-26 10:21:21 +0000 | [diff] [blame] | 2094 | will be programmed into hardware as part of the initialization process. This |
Ben Warren | ecee932 | 2010-04-26 11:11:46 -0700 | [diff] [blame] | 2095 | may be skipped by setting the appropriate 'ethmacskip' environment variable. |
| 2096 | The naming convention is as follows: |
| 2097 | "ethmacskip" (=>eth0), "eth1macskip" (=>eth1) etc. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2098 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2099 | Image Formats: |
| 2100 | ============== |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2101 | |
Marian Balakowicz | 3310c54 | 2008-03-12 12:13:13 +0100 | [diff] [blame] | 2102 | U-Boot is capable of booting (and performing other auxiliary operations on) |
| 2103 | images in two formats: |
| 2104 | |
| 2105 | New uImage format (FIT) |
| 2106 | ----------------------- |
| 2107 | |
| 2108 | Flexible and powerful format based on Flattened Image Tree -- FIT (similar |
| 2109 | to Flattened Device Tree). It allows the use of images with multiple |
| 2110 | components (several kernels, ramdisks, etc.), with contents protected by |
| 2111 | SHA1, MD5 or CRC32. More details are found in the doc/uImage.FIT directory. |
| 2112 | |
| 2113 | |
| 2114 | Old uImage format |
| 2115 | ----------------- |
| 2116 | |
| 2117 | Old image format is based on binary files which can be basically anything, |
| 2118 | preceded by a special header; see the definitions in include/image.h for |
| 2119 | details; basically, the header defines the following image properties: |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2120 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2121 | * Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD, |
| 2122 | 4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks, |
Peter Tyser | f5ed9e3 | 2008-09-08 14:56:49 -0500 | [diff] [blame] | 2123 | LynxOS, pSOS, QNX, RTEMS, INTEGRITY; |
Thomas Huth | 0797e73 | 2021-11-13 18:13:50 +0100 | [diff] [blame] | 2124 | Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, INTEGRITY). |
Andy Shevchenko | daab59a | 2017-07-05 16:25:22 +0300 | [diff] [blame] | 2125 | * Target CPU Architecture (Provisions for Alpha, ARM, Intel x86, |
Tom Rini | 1123213 | 2022-04-06 09:21:25 -0400 | [diff] [blame] | 2126 | IA64, MIPS, Nios II, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit; |
| 2127 | Currently supported: ARM, Intel x86, MIPS, Nios II, PowerPC). |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2128 | * Compression Type (uncompressed, gzip, bzip2) |
| 2129 | * Load Address |
| 2130 | * Entry Point |
| 2131 | * Image Name |
| 2132 | * Image Timestamp |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2133 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2134 | The header is marked by a special Magic Number, and both the header |
| 2135 | and the data portions of the image are secured against corruption by |
| 2136 | CRC32 checksums. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2137 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2138 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2139 | Linux Support: |
| 2140 | ============== |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2141 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2142 | Although U-Boot should support any OS or standalone application |
| 2143 | easily, the main focus has always been on Linux during the design of |
| 2144 | U-Boot. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2145 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2146 | U-Boot includes many features that so far have been part of some |
| 2147 | special "boot loader" code within the Linux kernel. Also, any |
| 2148 | "initrd" images to be used are no longer part of one big Linux image; |
| 2149 | instead, kernel and "initrd" are separate images. This implementation |
| 2150 | serves several purposes: |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2151 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2152 | - the same features can be used for other OS or standalone |
| 2153 | applications (for instance: using compressed images to reduce the |
| 2154 | Flash memory footprint) |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2155 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2156 | - it becomes much easier to port new Linux kernel versions because |
| 2157 | lots of low-level, hardware dependent stuff are done by U-Boot |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2158 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2159 | - the same Linux kernel image can now be used with different "initrd" |
| 2160 | images; of course this also means that different kernel images can |
| 2161 | be run with the same "initrd". This makes testing easier (you don't |
| 2162 | have to build a new "zImage.initrd" Linux image when you just |
| 2163 | change a file in your "initrd"). Also, a field-upgrade of the |
| 2164 | software is easier now. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2165 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2166 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2167 | Linux HOWTO: |
| 2168 | ============ |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2169 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2170 | Porting Linux to U-Boot based systems: |
| 2171 | --------------------------------------- |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2172 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2173 | U-Boot cannot save you from doing all the necessary modifications to |
| 2174 | configure the Linux device drivers for use with your target hardware |
| 2175 | (no, we don't intend to provide a full virtual machine interface to |
| 2176 | Linux :-). |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2177 | |
Stefan Roese | a47a12b | 2010-04-15 16:07:28 +0200 | [diff] [blame] | 2178 | But now you can ignore ALL boot loader code (in arch/powerpc/mbxboot). |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2179 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2180 | Just make sure your machine specific header file (for instance |
| 2181 | include/asm-ppc/tqm8xx.h) includes the same definition of the Board |
Markus Heidelberg | 1dc3069 | 2008-09-07 20:18:27 +0200 | [diff] [blame] | 2182 | Information structure as we define in include/asm-<arch>/u-boot.h, |
| 2183 | and make sure that your definition of IMAP_ADDR uses the same value |
Jean-Christophe PLAGNIOL-VILLARD | 6d0f6bc | 2008-10-16 15:01:15 +0200 | [diff] [blame] | 2184 | as your U-Boot configuration in CONFIG_SYS_IMMR. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2185 | |
Simon Glass | 2eb31b1 | 2014-06-11 23:29:46 -0600 | [diff] [blame] | 2186 | Note that U-Boot now has a driver model, a unified model for drivers. |
| 2187 | If you are adding a new driver, plumb it into driver model. If there |
| 2188 | is no uclass available, you are encouraged to create one. See |
| 2189 | doc/driver-model. |
| 2190 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2191 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2192 | Configuring the Linux kernel: |
| 2193 | ----------------------------- |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2194 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2195 | No specific requirements for U-Boot. Make sure you have some root |
| 2196 | device (initial ramdisk, NFS) for your target system. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2197 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2198 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2199 | Building a Linux Image: |
| 2200 | ----------------------- |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2201 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2202 | With U-Boot, "normal" build targets like "zImage" or "bzImage" are |
| 2203 | not used. If you use recent kernel source, a new build target |
| 2204 | "uImage" will exist which automatically builds an image usable by |
| 2205 | U-Boot. Most older kernels also have support for a "pImage" target, |
| 2206 | which was introduced for our predecessor project PPCBoot and uses a |
| 2207 | 100% compatible format. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2208 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2209 | Example: |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2210 | |
Holger Freyther | ab584d6 | 2014-08-04 09:26:05 +0200 | [diff] [blame] | 2211 | make TQM850L_defconfig |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2212 | make oldconfig |
| 2213 | make dep |
| 2214 | make uImage |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2215 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2216 | The "uImage" build target uses a special tool (in 'tools/mkimage') to |
| 2217 | encapsulate a compressed Linux kernel image with header information, |
| 2218 | CRC32 checksum etc. for use with U-Boot. This is what we are doing: |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2219 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2220 | * build a standard "vmlinux" kernel image (in ELF binary format): |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2221 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2222 | * convert the kernel into a raw binary image: |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2223 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2224 | ${CROSS_COMPILE}-objcopy -O binary \ |
| 2225 | -R .note -R .comment \ |
| 2226 | -S vmlinux linux.bin |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2227 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2228 | * compress the binary image: |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2229 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2230 | gzip -9 linux.bin |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2231 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2232 | * package compressed binary image for U-Boot: |
wdenk | 24ee89b | 2002-11-03 17:56:27 +0000 | [diff] [blame] | 2233 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2234 | mkimage -A ppc -O linux -T kernel -C gzip \ |
| 2235 | -a 0 -e 0 -n "Linux Kernel Image" \ |
| 2236 | -d linux.bin.gz uImage |
wdenk | 24ee89b | 2002-11-03 17:56:27 +0000 | [diff] [blame] | 2237 | |
wdenk | 24ee89b | 2002-11-03 17:56:27 +0000 | [diff] [blame] | 2238 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2239 | The "mkimage" tool can also be used to create ramdisk images for use |
| 2240 | with U-Boot, either separated from the Linux kernel image, or |
| 2241 | combined into one file. "mkimage" encapsulates the images with a 64 |
| 2242 | byte header containing information about target architecture, |
| 2243 | operating system, image type, compression method, entry points, time |
| 2244 | stamp, CRC32 checksums, etc. |
wdenk | 24ee89b | 2002-11-03 17:56:27 +0000 | [diff] [blame] | 2245 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2246 | "mkimage" can be called in two ways: to verify existing images and |
| 2247 | print the header information, or to build new images. |
wdenk | 24ee89b | 2002-11-03 17:56:27 +0000 | [diff] [blame] | 2248 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2249 | In the first form (with "-l" option) mkimage lists the information |
| 2250 | contained in the header of an existing U-Boot image; this includes |
| 2251 | checksum verification: |
wdenk | 24ee89b | 2002-11-03 17:56:27 +0000 | [diff] [blame] | 2252 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2253 | tools/mkimage -l image |
| 2254 | -l ==> list image header information |
wdenk | 24ee89b | 2002-11-03 17:56:27 +0000 | [diff] [blame] | 2255 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2256 | The second form (with "-d" option) is used to build a U-Boot image |
| 2257 | from a "data file" which is used as image payload: |
wdenk | 24ee89b | 2002-11-03 17:56:27 +0000 | [diff] [blame] | 2258 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2259 | tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \ |
| 2260 | -n name -d data_file image |
| 2261 | -A ==> set architecture to 'arch' |
| 2262 | -O ==> set operating system to 'os' |
| 2263 | -T ==> set image type to 'type' |
| 2264 | -C ==> set compression type 'comp' |
| 2265 | -a ==> set load address to 'addr' (hex) |
| 2266 | -e ==> set entry point to 'ep' (hex) |
| 2267 | -n ==> set image name to 'name' |
| 2268 | -d ==> use image data from 'datafile' |
wdenk | 24ee89b | 2002-11-03 17:56:27 +0000 | [diff] [blame] | 2269 | |
wdenk | 6945979 | 2004-05-29 16:53:29 +0000 | [diff] [blame] | 2270 | Right now, all Linux kernels for PowerPC systems use the same load |
| 2271 | address (0x00000000), but the entry point address depends on the |
| 2272 | kernel version: |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2273 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2274 | - 2.2.x kernels have the entry point at 0x0000000C, |
| 2275 | - 2.3.x and later kernels have the entry point at 0x00000000. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2276 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2277 | So a typical call to build a U-Boot image would read: |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2278 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2279 | -> tools/mkimage -n '2.4.4 kernel for TQM850L' \ |
| 2280 | > -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \ |
Stefan Roese | a47a12b | 2010-04-15 16:07:28 +0200 | [diff] [blame] | 2281 | > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz \ |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2282 | > examples/uImage.TQM850L |
| 2283 | Image Name: 2.4.4 kernel for TQM850L |
| 2284 | Created: Wed Jul 19 02:34:59 2000 |
| 2285 | Image Type: PowerPC Linux Kernel Image (gzip compressed) |
| 2286 | Data Size: 335725 Bytes = 327.86 kB = 0.32 MB |
| 2287 | Load Address: 0x00000000 |
| 2288 | Entry Point: 0x00000000 |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2289 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2290 | To verify the contents of the image (or check for corruption): |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2291 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2292 | -> tools/mkimage -l examples/uImage.TQM850L |
| 2293 | Image Name: 2.4.4 kernel for TQM850L |
| 2294 | Created: Wed Jul 19 02:34:59 2000 |
| 2295 | Image Type: PowerPC Linux Kernel Image (gzip compressed) |
| 2296 | Data Size: 335725 Bytes = 327.86 kB = 0.32 MB |
| 2297 | Load Address: 0x00000000 |
| 2298 | Entry Point: 0x00000000 |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2299 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2300 | NOTE: for embedded systems where boot time is critical you can trade |
| 2301 | speed for memory and install an UNCOMPRESSED image instead: this |
| 2302 | needs more space in Flash, but boots much faster since it does not |
| 2303 | need to be uncompressed: |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2304 | |
Stefan Roese | a47a12b | 2010-04-15 16:07:28 +0200 | [diff] [blame] | 2305 | -> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2306 | -> tools/mkimage -n '2.4.4 kernel for TQM850L' \ |
| 2307 | > -A ppc -O linux -T kernel -C none -a 0 -e 0 \ |
Stefan Roese | a47a12b | 2010-04-15 16:07:28 +0200 | [diff] [blame] | 2308 | > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux \ |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2309 | > examples/uImage.TQM850L-uncompressed |
| 2310 | Image Name: 2.4.4 kernel for TQM850L |
| 2311 | Created: Wed Jul 19 02:34:59 2000 |
| 2312 | Image Type: PowerPC Linux Kernel Image (uncompressed) |
| 2313 | Data Size: 792160 Bytes = 773.59 kB = 0.76 MB |
| 2314 | Load Address: 0x00000000 |
| 2315 | Entry Point: 0x00000000 |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2316 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2317 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2318 | Similar you can build U-Boot images from a 'ramdisk.image.gz' file |
| 2319 | when your kernel is intended to use an initial ramdisk: |
wdenk | db01a2e | 2004-04-15 23:14:49 +0000 | [diff] [blame] | 2320 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2321 | -> tools/mkimage -n 'Simple Ramdisk Image' \ |
| 2322 | > -A ppc -O linux -T ramdisk -C gzip \ |
| 2323 | > -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd |
| 2324 | Image Name: Simple Ramdisk Image |
| 2325 | Created: Wed Jan 12 14:01:50 2000 |
| 2326 | Image Type: PowerPC Linux RAMDisk Image (gzip compressed) |
| 2327 | Data Size: 566530 Bytes = 553.25 kB = 0.54 MB |
| 2328 | Load Address: 0x00000000 |
| 2329 | Entry Point: 0x00000000 |
wdenk | db01a2e | 2004-04-15 23:14:49 +0000 | [diff] [blame] | 2330 | |
Tyler Hicks | e157a11 | 2020-10-26 10:40:24 -0500 | [diff] [blame] | 2331 | The "dumpimage" tool can be used to disassemble or list the contents of images |
| 2332 | built by mkimage. See dumpimage's help output (-h) for details. |
wdenk | db01a2e | 2004-04-15 23:14:49 +0000 | [diff] [blame] | 2333 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2334 | Installing a Linux Image: |
| 2335 | ------------------------- |
wdenk | db01a2e | 2004-04-15 23:14:49 +0000 | [diff] [blame] | 2336 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2337 | To downloading a U-Boot image over the serial (console) interface, |
| 2338 | you must convert the image to S-Record format: |
wdenk | db01a2e | 2004-04-15 23:14:49 +0000 | [diff] [blame] | 2339 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2340 | objcopy -I binary -O srec examples/image examples/image.srec |
wdenk | db01a2e | 2004-04-15 23:14:49 +0000 | [diff] [blame] | 2341 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2342 | The 'objcopy' does not understand the information in the U-Boot |
| 2343 | image header, so the resulting S-Record file will be relative to |
| 2344 | address 0x00000000. To load it to a given address, you need to |
| 2345 | specify the target address as 'offset' parameter with the 'loads' |
| 2346 | command. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2347 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2348 | Example: install the image to address 0x40100000 (which on the |
| 2349 | TQM8xxL is in the first Flash bank): |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2350 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2351 | => erase 40100000 401FFFFF |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2352 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2353 | .......... done |
| 2354 | Erased 8 sectors |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2355 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2356 | => loads 40100000 |
| 2357 | ## Ready for S-Record download ... |
| 2358 | ~>examples/image.srec |
| 2359 | 1 2 3 4 5 6 7 8 9 10 11 12 13 ... |
| 2360 | ... |
| 2361 | 15989 15990 15991 15992 |
| 2362 | [file transfer complete] |
| 2363 | [connected] |
| 2364 | ## Start Addr = 0x00000000 |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2365 | |
| 2366 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2367 | You can check the success of the download using the 'iminfo' command; |
Wolfgang Denk | 218ca72 | 2008-03-26 10:40:12 +0100 | [diff] [blame] | 2368 | this includes a checksum verification so you can be sure no data |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2369 | corruption happened: |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2370 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2371 | => imi 40100000 |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2372 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2373 | ## Checking Image at 40100000 ... |
| 2374 | Image Name: 2.2.13 for initrd on TQM850L |
| 2375 | Image Type: PowerPC Linux Kernel Image (gzip compressed) |
| 2376 | Data Size: 335725 Bytes = 327 kB = 0 MB |
| 2377 | Load Address: 00000000 |
| 2378 | Entry Point: 0000000c |
| 2379 | Verifying Checksum ... OK |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2380 | |
| 2381 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2382 | Boot Linux: |
| 2383 | ----------- |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2384 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2385 | The "bootm" command is used to boot an application that is stored in |
| 2386 | memory (RAM or Flash). In case of a Linux kernel image, the contents |
| 2387 | of the "bootargs" environment variable is passed to the kernel as |
| 2388 | parameters. You can check and modify this variable using the |
| 2389 | "printenv" and "setenv" commands: |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2390 | |
| 2391 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2392 | => printenv bootargs |
| 2393 | bootargs=root=/dev/ram |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2394 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2395 | => setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2 |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2396 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2397 | => printenv bootargs |
| 2398 | bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2 |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2399 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2400 | => bootm 40020000 |
| 2401 | ## Booting Linux kernel at 40020000 ... |
| 2402 | Image Name: 2.2.13 for NFS on TQM850L |
| 2403 | Image Type: PowerPC Linux Kernel Image (gzip compressed) |
| 2404 | Data Size: 381681 Bytes = 372 kB = 0 MB |
| 2405 | Load Address: 00000000 |
| 2406 | Entry Point: 0000000c |
| 2407 | Verifying Checksum ... OK |
| 2408 | Uncompressing Kernel Image ... OK |
| 2409 | Linux version 2.2.13 (wd@denx.local.net) (gcc version 2.95.2 19991024 (release)) #1 Wed Jul 19 02:35:17 MEST 2000 |
| 2410 | Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2 |
| 2411 | time_init: decrementer frequency = 187500000/60 |
| 2412 | Calibrating delay loop... 49.77 BogoMIPS |
| 2413 | Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000] |
| 2414 | ... |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2415 | |
Marcel Ziswiler | 11ccc33 | 2008-07-09 08:17:15 +0200 | [diff] [blame] | 2416 | If you want to boot a Linux kernel with initial RAM disk, you pass |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2417 | the memory addresses of both the kernel and the initrd image (PPBCOOT |
| 2418 | format!) to the "bootm" command: |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2419 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2420 | => imi 40100000 40200000 |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2421 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2422 | ## Checking Image at 40100000 ... |
| 2423 | Image Name: 2.2.13 for initrd on TQM850L |
| 2424 | Image Type: PowerPC Linux Kernel Image (gzip compressed) |
| 2425 | Data Size: 335725 Bytes = 327 kB = 0 MB |
| 2426 | Load Address: 00000000 |
| 2427 | Entry Point: 0000000c |
| 2428 | Verifying Checksum ... OK |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2429 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2430 | ## Checking Image at 40200000 ... |
| 2431 | Image Name: Simple Ramdisk Image |
| 2432 | Image Type: PowerPC Linux RAMDisk Image (gzip compressed) |
| 2433 | Data Size: 566530 Bytes = 553 kB = 0 MB |
| 2434 | Load Address: 00000000 |
| 2435 | Entry Point: 00000000 |
| 2436 | Verifying Checksum ... OK |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2437 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2438 | => bootm 40100000 40200000 |
| 2439 | ## Booting Linux kernel at 40100000 ... |
| 2440 | Image Name: 2.2.13 for initrd on TQM850L |
| 2441 | Image Type: PowerPC Linux Kernel Image (gzip compressed) |
| 2442 | Data Size: 335725 Bytes = 327 kB = 0 MB |
| 2443 | Load Address: 00000000 |
| 2444 | Entry Point: 0000000c |
| 2445 | Verifying Checksum ... OK |
| 2446 | Uncompressing Kernel Image ... OK |
| 2447 | ## Loading RAMDisk Image at 40200000 ... |
| 2448 | Image Name: Simple Ramdisk Image |
| 2449 | Image Type: PowerPC Linux RAMDisk Image (gzip compressed) |
| 2450 | Data Size: 566530 Bytes = 553 kB = 0 MB |
| 2451 | Load Address: 00000000 |
| 2452 | Entry Point: 00000000 |
| 2453 | Verifying Checksum ... OK |
| 2454 | Loading Ramdisk ... OK |
| 2455 | Linux version 2.2.13 (wd@denx.local.net) (gcc version 2.95.2 19991024 (release)) #1 Wed Jul 19 02:32:08 MEST 2000 |
| 2456 | Boot arguments: root=/dev/ram |
| 2457 | time_init: decrementer frequency = 187500000/60 |
| 2458 | Calibrating delay loop... 49.77 BogoMIPS |
| 2459 | ... |
| 2460 | RAMDISK: Compressed image found at block 0 |
| 2461 | VFS: Mounted root (ext2 filesystem). |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2462 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2463 | bash# |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2464 | |
Matthew McClintock | 0267768 | 2006-06-28 10:41:37 -0500 | [diff] [blame] | 2465 | Boot Linux and pass a flat device tree: |
| 2466 | ----------- |
| 2467 | |
| 2468 | First, U-Boot must be compiled with the appropriate defines. See the section |
| 2469 | titled "Linux Kernel Interface" above for a more in depth explanation. The |
| 2470 | following is an example of how to start a kernel and pass an updated |
| 2471 | flat device tree: |
| 2472 | |
| 2473 | => print oftaddr |
| 2474 | oftaddr=0x300000 |
| 2475 | => print oft |
| 2476 | oft=oftrees/mpc8540ads.dtb |
| 2477 | => tftp $oftaddr $oft |
| 2478 | Speed: 1000, full duplex |
| 2479 | Using TSEC0 device |
| 2480 | TFTP from server 192.168.1.1; our IP address is 192.168.1.101 |
| 2481 | Filename 'oftrees/mpc8540ads.dtb'. |
| 2482 | Load address: 0x300000 |
| 2483 | Loading: # |
| 2484 | done |
| 2485 | Bytes transferred = 4106 (100a hex) |
| 2486 | => tftp $loadaddr $bootfile |
| 2487 | Speed: 1000, full duplex |
| 2488 | Using TSEC0 device |
| 2489 | TFTP from server 192.168.1.1; our IP address is 192.168.1.2 |
| 2490 | Filename 'uImage'. |
| 2491 | Load address: 0x200000 |
| 2492 | Loading:############ |
| 2493 | done |
| 2494 | Bytes transferred = 1029407 (fb51f hex) |
| 2495 | => print loadaddr |
| 2496 | loadaddr=200000 |
| 2497 | => print oftaddr |
| 2498 | oftaddr=0x300000 |
| 2499 | => bootm $loadaddr - $oftaddr |
| 2500 | ## Booting image at 00200000 ... |
Wolfgang Denk | a9398e0 | 2006-11-27 15:32:42 +0100 | [diff] [blame] | 2501 | Image Name: Linux-2.6.17-dirty |
| 2502 | Image Type: PowerPC Linux Kernel Image (gzip compressed) |
| 2503 | Data Size: 1029343 Bytes = 1005.2 kB |
Matthew McClintock | 0267768 | 2006-06-28 10:41:37 -0500 | [diff] [blame] | 2504 | Load Address: 00000000 |
Wolfgang Denk | a9398e0 | 2006-11-27 15:32:42 +0100 | [diff] [blame] | 2505 | Entry Point: 00000000 |
Matthew McClintock | 0267768 | 2006-06-28 10:41:37 -0500 | [diff] [blame] | 2506 | Verifying Checksum ... OK |
| 2507 | Uncompressing Kernel Image ... OK |
| 2508 | Booting using flat device tree at 0x300000 |
| 2509 | Using MPC85xx ADS machine description |
| 2510 | Memory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb |
| 2511 | [snip] |
| 2512 | |
| 2513 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2514 | More About U-Boot Image Types: |
| 2515 | ------------------------------ |
wdenk | 6069ff2 | 2003-02-28 00:49:47 +0000 | [diff] [blame] | 2516 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2517 | U-Boot supports the following image types: |
wdenk | 6069ff2 | 2003-02-28 00:49:47 +0000 | [diff] [blame] | 2518 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2519 | "Standalone Programs" are directly runnable in the environment |
| 2520 | provided by U-Boot; it is expected that (if they behave |
| 2521 | well) you can continue to work in U-Boot after return from |
| 2522 | the Standalone Program. |
| 2523 | "OS Kernel Images" are usually images of some Embedded OS which |
| 2524 | will take over control completely. Usually these programs |
| 2525 | will install their own set of exception handlers, device |
| 2526 | drivers, set up the MMU, etc. - this means, that you cannot |
| 2527 | expect to re-enter U-Boot except by resetting the CPU. |
| 2528 | "RAMDisk Images" are more or less just data blocks, and their |
| 2529 | parameters (address, size) are passed to an OS kernel that is |
| 2530 | being started. |
| 2531 | "Multi-File Images" contain several images, typically an OS |
| 2532 | (Linux) kernel image and one or more data images like |
| 2533 | RAMDisks. This construct is useful for instance when you want |
| 2534 | to boot over the network using BOOTP etc., where the boot |
| 2535 | server provides just a single image file, but you want to get |
| 2536 | for instance an OS kernel and a RAMDisk image. |
stroese | c1551ea | 2003-04-04 15:53:41 +0000 | [diff] [blame] | 2537 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2538 | "Multi-File Images" start with a list of image sizes, each |
| 2539 | image size (in bytes) specified by an "uint32_t" in network |
| 2540 | byte order. This list is terminated by an "(uint32_t)0". |
| 2541 | Immediately after the terminating 0 follow the images, one by |
| 2542 | one, all aligned on "uint32_t" boundaries (size rounded up to |
| 2543 | a multiple of 4 bytes). |
stroese | c1551ea | 2003-04-04 15:53:41 +0000 | [diff] [blame] | 2544 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2545 | "Firmware Images" are binary images containing firmware (like |
| 2546 | U-Boot or FPGA images) which usually will be programmed to |
| 2547 | flash memory. |
stroese | c1551ea | 2003-04-04 15:53:41 +0000 | [diff] [blame] | 2548 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2549 | "Script files" are command sequences that will be executed by |
| 2550 | U-Boot's command interpreter; this feature is especially |
| 2551 | useful when you configure U-Boot to use a real shell (hush) |
| 2552 | as command interpreter. |
wdenk | 6069ff2 | 2003-02-28 00:49:47 +0000 | [diff] [blame] | 2553 | |
Marek Vasut | 44f074c | 2012-03-14 21:52:45 +0000 | [diff] [blame] | 2554 | Booting the Linux zImage: |
| 2555 | ------------------------- |
| 2556 | |
| 2557 | On some platforms, it's possible to boot Linux zImage. This is done |
| 2558 | using the "bootz" command. The syntax of "bootz" command is the same |
| 2559 | as the syntax of "bootm" command. |
| 2560 | |
Tom Rini | 8ac2856 | 2013-05-16 11:40:11 -0400 | [diff] [blame] | 2561 | Note, defining the CONFIG_SUPPORT_RAW_INITRD allows user to supply |
Marek Vasut | 017e1f3 | 2012-03-18 11:47:58 +0000 | [diff] [blame] | 2562 | kernel with raw initrd images. The syntax is slightly different, the |
| 2563 | address of the initrd must be augmented by it's size, in the following |
| 2564 | format: "<initrd addres>:<initrd size>". |
| 2565 | |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2566 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2567 | Standalone HOWTO: |
| 2568 | ================= |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2569 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2570 | One of the features of U-Boot is that you can dynamically load and |
| 2571 | run "standalone" applications, which can use some resources of |
| 2572 | U-Boot like console I/O functions or interrupt services. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2573 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2574 | Two simple examples are included with the sources: |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2575 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2576 | "Hello World" Demo: |
| 2577 | ------------------- |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2578 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2579 | 'examples/hello_world.c' contains a small "Hello World" Demo |
| 2580 | application; it is automatically compiled when you build U-Boot. |
| 2581 | It's configured to run at address 0x00040004, so you can play with it |
| 2582 | like that: |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2583 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2584 | => loads |
| 2585 | ## Ready for S-Record download ... |
| 2586 | ~>examples/hello_world.srec |
| 2587 | 1 2 3 4 5 6 7 8 9 10 11 ... |
| 2588 | [file transfer complete] |
| 2589 | [connected] |
| 2590 | ## Start Addr = 0x00040004 |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2591 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2592 | => go 40004 Hello World! This is a test. |
| 2593 | ## Starting application at 0x00040004 ... |
| 2594 | Hello World |
| 2595 | argc = 7 |
| 2596 | argv[0] = "40004" |
| 2597 | argv[1] = "Hello" |
| 2598 | argv[2] = "World!" |
| 2599 | argv[3] = "This" |
| 2600 | argv[4] = "is" |
| 2601 | argv[5] = "a" |
| 2602 | argv[6] = "test." |
| 2603 | argv[7] = "<NULL>" |
| 2604 | Hit any key to exit ... |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2605 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2606 | ## Application terminated, rc = 0x0 |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2607 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2608 | Another example, which demonstrates how to register a CPM interrupt |
| 2609 | handler with the U-Boot code, can be found in 'examples/timer.c'. |
| 2610 | Here, a CPM timer is set up to generate an interrupt every second. |
| 2611 | The interrupt service routine is trivial, just printing a '.' |
| 2612 | character, but this is just a demo program. The application can be |
| 2613 | controlled by the following keys: |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2614 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2615 | ? - print current values og the CPM Timer registers |
| 2616 | b - enable interrupts and start timer |
| 2617 | e - stop timer and disable interrupts |
| 2618 | q - quit application |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2619 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2620 | => loads |
| 2621 | ## Ready for S-Record download ... |
| 2622 | ~>examples/timer.srec |
| 2623 | 1 2 3 4 5 6 7 8 9 10 11 ... |
| 2624 | [file transfer complete] |
| 2625 | [connected] |
| 2626 | ## Start Addr = 0x00040004 |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2627 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2628 | => go 40004 |
| 2629 | ## Starting application at 0x00040004 ... |
| 2630 | TIMERS=0xfff00980 |
| 2631 | Using timer 1 |
| 2632 | tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0 |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2633 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2634 | Hit 'b': |
| 2635 | [q, b, e, ?] Set interval 1000000 us |
| 2636 | Enabling timer |
| 2637 | Hit '?': |
| 2638 | [q, b, e, ?] ........ |
| 2639 | tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0 |
| 2640 | Hit '?': |
| 2641 | [q, b, e, ?] . |
| 2642 | tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0 |
| 2643 | Hit '?': |
| 2644 | [q, b, e, ?] . |
| 2645 | tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0 |
| 2646 | Hit '?': |
| 2647 | [q, b, e, ?] . |
| 2648 | tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0 |
| 2649 | Hit 'e': |
| 2650 | [q, b, e, ?] ...Stopping timer |
| 2651 | Hit 'q': |
| 2652 | [q, b, e, ?] ## Application terminated, rc = 0x0 |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2653 | |
| 2654 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2655 | Minicom warning: |
| 2656 | ================ |
wdenk | 85ec0bc | 2003-03-31 16:34:49 +0000 | [diff] [blame] | 2657 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2658 | Over time, many people have reported problems when trying to use the |
| 2659 | "minicom" terminal emulation program for serial download. I (wd) |
| 2660 | consider minicom to be broken, and recommend not to use it. Under |
| 2661 | Unix, I recommend to use C-Kermit for general purpose use (and |
| 2662 | especially for kermit binary protocol download ("loadb" command), and |
Karl O. Pinc | e53515a | 2012-10-01 05:11:56 +0000 | [diff] [blame] | 2663 | use "cu" for S-Record download ("loads" command). See |
Naoki Hayama | 047f6ec | 2020-10-08 13:17:16 +0900 | [diff] [blame] | 2664 | https://www.denx.de/wiki/view/DULG/SystemSetup#Section_4.3. |
Karl O. Pinc | e53515a | 2012-10-01 05:11:56 +0000 | [diff] [blame] | 2665 | for help with kermit. |
| 2666 | |
wdenk | 85ec0bc | 2003-03-31 16:34:49 +0000 | [diff] [blame] | 2667 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2668 | Nevertheless, if you absolutely want to use it try adding this |
| 2669 | configuration to your "File transfer protocols" section: |
wdenk | 52f52c1 | 2003-06-19 23:04:19 +0000 | [diff] [blame] | 2670 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2671 | Name Program Name U/D FullScr IO-Red. Multi |
| 2672 | X kermit /usr/bin/kermit -i -l %l -s Y U Y N N |
| 2673 | Y kermit /usr/bin/kermit -i -l %l -r N D Y N N |
wdenk | 52f52c1 | 2003-06-19 23:04:19 +0000 | [diff] [blame] | 2674 | |
| 2675 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2676 | NetBSD Notes: |
| 2677 | ============= |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2678 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2679 | Starting at version 0.9.2, U-Boot supports NetBSD both as host |
| 2680 | (build U-Boot) and target system (boots NetBSD/mpc8xx). |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2681 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2682 | Building requires a cross environment; it is known to work on |
| 2683 | NetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also |
| 2684 | need gmake since the Makefiles are not compatible with BSD make). |
| 2685 | Note that the cross-powerpc package does not install include files; |
| 2686 | attempting to build U-Boot will fail because <machine/ansi.h> is |
| 2687 | missing. This file has to be installed and patched manually: |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2688 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2689 | # cd /usr/pkg/cross/powerpc-netbsd/include |
| 2690 | # mkdir powerpc |
| 2691 | # ln -s powerpc machine |
| 2692 | # cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h |
| 2693 | # ${EDIT} powerpc/ansi.h ## must remove __va_list, _BSD_VA_LIST |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2694 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2695 | Native builds *don't* work due to incompatibilities between native |
| 2696 | and U-Boot include files. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2697 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2698 | Booting assumes that (the first part of) the image booted is a |
| 2699 | stage-2 loader which in turn loads and then invokes the kernel |
| 2700 | proper. Loader sources will eventually appear in the NetBSD source |
| 2701 | tree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the |
wdenk | 2a8af18 | 2005-04-13 10:02:42 +0000 | [diff] [blame] | 2702 | meantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2703 | |
| 2704 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2705 | Implementation Internals: |
| 2706 | ========================= |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2707 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2708 | The following is not intended to be a complete description of every |
| 2709 | implementation detail. However, it should help to understand the |
| 2710 | inner workings of U-Boot and make it easier to port it to custom |
| 2711 | hardware. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2712 | |
| 2713 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2714 | Initial Stack, Global Data: |
| 2715 | --------------------------- |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2716 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2717 | The implementation of U-Boot is complicated by the fact that U-Boot |
| 2718 | starts running out of ROM (flash memory), usually without access to |
| 2719 | system RAM (because the memory controller is not initialized yet). |
| 2720 | This means that we don't have writable Data or BSS segments, and BSS |
| 2721 | is not initialized as zero. To be able to get a C environment working |
| 2722 | at all, we have to allocate at least a minimal stack. Implementation |
| 2723 | options for this are defined and restricted by the CPU used: Some CPU |
| 2724 | models provide on-chip memory (like the IMMR area on MPC8xx and |
| 2725 | MPC826x processors), on others (parts of) the data cache can be |
| 2726 | locked as (mis-) used as memory, etc. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2727 | |
Wolfgang Denk | 218ca72 | 2008-03-26 10:40:12 +0100 | [diff] [blame] | 2728 | Chris Hallinan posted a good summary of these issues to the |
Wolfgang Denk | 0668236 | 2008-12-30 22:56:11 +0100 | [diff] [blame] | 2729 | U-Boot mailing list: |
wdenk | 43d9616 | 2003-03-06 00:02:04 +0000 | [diff] [blame] | 2730 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2731 | Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)? |
| 2732 | From: "Chris Hallinan" <clh@net1plus.com> |
| 2733 | Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET) |
| 2734 | ... |
wdenk | 43d9616 | 2003-03-06 00:02:04 +0000 | [diff] [blame] | 2735 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2736 | Correct me if I'm wrong, folks, but the way I understand it |
| 2737 | is this: Using DCACHE as initial RAM for Stack, etc, does not |
| 2738 | require any physical RAM backing up the cache. The cleverness |
| 2739 | is that the cache is being used as a temporary supply of |
| 2740 | necessary storage before the SDRAM controller is setup. It's |
Marcel Ziswiler | 11ccc33 | 2008-07-09 08:17:15 +0200 | [diff] [blame] | 2741 | beyond the scope of this list to explain the details, but you |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2742 | can see how this works by studying the cache architecture and |
| 2743 | operation in the architecture and processor-specific manuals. |
wdenk | 43d9616 | 2003-03-06 00:02:04 +0000 | [diff] [blame] | 2744 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2745 | OCM is On Chip Memory, which I believe the 405GP has 4K. It |
| 2746 | is another option for the system designer to use as an |
Marcel Ziswiler | 11ccc33 | 2008-07-09 08:17:15 +0200 | [diff] [blame] | 2747 | initial stack/RAM area prior to SDRAM being available. Either |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2748 | option should work for you. Using CS 4 should be fine if your |
| 2749 | board designers haven't used it for something that would |
| 2750 | cause you grief during the initial boot! It is frequently not |
| 2751 | used. |
wdenk | 43d9616 | 2003-03-06 00:02:04 +0000 | [diff] [blame] | 2752 | |
Jean-Christophe PLAGNIOL-VILLARD | 6d0f6bc | 2008-10-16 15:01:15 +0200 | [diff] [blame] | 2753 | CONFIG_SYS_INIT_RAM_ADDR should be somewhere that won't interfere |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2754 | with your processor/board/system design. The default value |
| 2755 | you will find in any recent u-boot distribution in |
Stefan Roese | 8a316c9 | 2005-08-01 16:49:12 +0200 | [diff] [blame] | 2756 | walnut.h should work for you. I'd set it to a value larger |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2757 | than your SDRAM module. If you have a 64MB SDRAM module, set |
| 2758 | it above 400_0000. Just make sure your board has no resources |
| 2759 | that are supposed to respond to that address! That code in |
| 2760 | start.S has been around a while and should work as is when |
| 2761 | you get the config right. |
wdenk | 43d9616 | 2003-03-06 00:02:04 +0000 | [diff] [blame] | 2762 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2763 | -Chris Hallinan |
| 2764 | DS4.COM, Inc. |
wdenk | 43d9616 | 2003-03-06 00:02:04 +0000 | [diff] [blame] | 2765 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2766 | It is essential to remember this, since it has some impact on the C |
| 2767 | code for the initialization procedures: |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2768 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2769 | * Initialized global data (data segment) is read-only. Do not attempt |
| 2770 | to write it. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2771 | |
Jeremiah Mahler | b445bbb | 2015-01-04 18:56:50 -0800 | [diff] [blame] | 2772 | * Do not use any uninitialized global data (or implicitly initialized |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2773 | as zero data - BSS segment) at all - this is undefined, initiali- |
| 2774 | zation is performed later (when relocating to RAM). |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2775 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2776 | * Stack space is very limited. Avoid big data buffers or things like |
| 2777 | that. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2778 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2779 | Having only the stack as writable memory limits means we cannot use |
Jeremiah Mahler | b445bbb | 2015-01-04 18:56:50 -0800 | [diff] [blame] | 2780 | normal global data to share information between the code. But it |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2781 | turned out that the implementation of U-Boot can be greatly |
| 2782 | simplified by making a global data structure (gd_t) available to all |
| 2783 | functions. We could pass a pointer to this data as argument to _all_ |
| 2784 | functions, but this would bloat the code. Instead we use a feature of |
| 2785 | the GCC compiler (Global Register Variables) to share the data: we |
| 2786 | place a pointer (gd) to the global data into a register which we |
| 2787 | reserve for this purpose. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2788 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2789 | When choosing a register for such a purpose we are restricted by the |
| 2790 | relevant (E)ABI specifications for the current architecture, and by |
| 2791 | GCC's implementation. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2792 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2793 | For PowerPC, the following registers have specific use: |
| 2794 | R1: stack pointer |
Wolfgang Denk | e7670f6 | 2008-02-14 22:43:22 +0100 | [diff] [blame] | 2795 | R2: reserved for system use |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2796 | R3-R4: parameter passing and return values |
| 2797 | R5-R10: parameter passing |
| 2798 | R13: small data area pointer |
| 2799 | R30: GOT pointer |
| 2800 | R31: frame pointer |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2801 | |
Joakim Tjernlund | e6bee80 | 2010-01-19 14:41:58 +0100 | [diff] [blame] | 2802 | (U-Boot also uses R12 as internal GOT pointer. r12 |
| 2803 | is a volatile register so r12 needs to be reset when |
| 2804 | going back and forth between asm and C) |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2805 | |
Wolfgang Denk | e7670f6 | 2008-02-14 22:43:22 +0100 | [diff] [blame] | 2806 | ==> U-Boot will use R2 to hold a pointer to the global data |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2807 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2808 | Note: on PPC, we could use a static initializer (since the |
| 2809 | address of the global data structure is known at compile time), |
| 2810 | but it turned out that reserving a register results in somewhat |
| 2811 | smaller code - although the code savings are not that big (on |
| 2812 | average for all boards 752 bytes for the whole U-Boot image, |
| 2813 | 624 text + 127 data). |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2814 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2815 | On ARM, the following registers are used: |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2816 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2817 | R0: function argument word/integer result |
| 2818 | R1-R3: function argument word |
Jeroen Hofstee | 12eba1b | 2013-09-21 14:04:42 +0200 | [diff] [blame] | 2819 | R9: platform specific |
| 2820 | R10: stack limit (used only if stack checking is enabled) |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2821 | R11: argument (frame) pointer |
| 2822 | R12: temporary workspace |
| 2823 | R13: stack pointer |
| 2824 | R14: link register |
| 2825 | R15: program counter |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2826 | |
Jeroen Hofstee | 12eba1b | 2013-09-21 14:04:42 +0200 | [diff] [blame] | 2827 | ==> U-Boot will use R9 to hold a pointer to the global data |
| 2828 | |
| 2829 | Note: on ARM, only R_ARM_RELATIVE relocations are supported. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2830 | |
Thomas Chou | 0df01fd | 2010-05-21 11:08:03 +0800 | [diff] [blame] | 2831 | On Nios II, the ABI is documented here: |
Naoki Hayama | 047f6ec | 2020-10-08 13:17:16 +0900 | [diff] [blame] | 2832 | https://www.altera.com/literature/hb/nios2/n2cpu_nii51016.pdf |
Thomas Chou | 0df01fd | 2010-05-21 11:08:03 +0800 | [diff] [blame] | 2833 | |
| 2834 | ==> U-Boot will use gp to hold a pointer to the global data |
| 2835 | |
| 2836 | Note: on Nios II, we give "-G0" option to gcc and don't use gp |
| 2837 | to access small data sections, so gp is free. |
| 2838 | |
Rick Chen | 3fafced | 2017-12-26 13:55:59 +0800 | [diff] [blame] | 2839 | On RISC-V, the following registers are used: |
| 2840 | |
| 2841 | x0: hard-wired zero (zero) |
| 2842 | x1: return address (ra) |
| 2843 | x2: stack pointer (sp) |
| 2844 | x3: global pointer (gp) |
| 2845 | x4: thread pointer (tp) |
| 2846 | x5: link register (t0) |
| 2847 | x8: frame pointer (fp) |
| 2848 | x10-x11: arguments/return values (a0-1) |
| 2849 | x12-x17: arguments (a2-7) |
| 2850 | x28-31: temporaries (t3-6) |
| 2851 | pc: program counter (pc) |
| 2852 | |
| 2853 | ==> U-Boot will use gp to hold a pointer to the global data |
| 2854 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2855 | Memory Management: |
| 2856 | ------------------ |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2857 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2858 | U-Boot runs in system state and uses physical addresses, i.e. the |
| 2859 | MMU is not used either for address mapping nor for memory protection. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2860 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2861 | The available memory is mapped to fixed addresses using the memory |
| 2862 | controller. In this process, a contiguous block is formed for each |
| 2863 | memory type (Flash, SDRAM, SRAM), even when it consists of several |
| 2864 | physical memory banks. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2865 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2866 | U-Boot is installed in the first 128 kB of the first Flash bank (on |
| 2867 | TQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After |
| 2868 | booting and sizing and initializing DRAM, the code relocates itself |
| 2869 | to the upper end of DRAM. Immediately below the U-Boot code some |
Jean-Christophe PLAGNIOL-VILLARD | 6d0f6bc | 2008-10-16 15:01:15 +0200 | [diff] [blame] | 2870 | memory is reserved for use by malloc() [see CONFIG_SYS_MALLOC_LEN |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2871 | configuration setting]. Below that, a structure with global Board |
| 2872 | Info data is placed, followed by the stack (growing downward). |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2873 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2874 | Additionally, some exception handler code is copied to the low 8 kB |
| 2875 | of DRAM (0x00000000 ... 0x00001FFF). |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2876 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2877 | So a typical memory configuration with 16 MB of DRAM could look like |
| 2878 | this: |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2879 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2880 | 0x0000 0000 Exception Vector code |
| 2881 | : |
| 2882 | 0x0000 1FFF |
| 2883 | 0x0000 2000 Free for Application Use |
| 2884 | : |
| 2885 | : |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2886 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2887 | : |
| 2888 | : |
| 2889 | 0x00FB FF20 Monitor Stack (Growing downward) |
| 2890 | 0x00FB FFAC Board Info Data and permanent copy of global data |
| 2891 | 0x00FC 0000 Malloc Arena |
| 2892 | : |
| 2893 | 0x00FD FFFF |
| 2894 | 0x00FE 0000 RAM Copy of Monitor Code |
| 2895 | ... eventually: LCD or video framebuffer |
| 2896 | ... eventually: pRAM (Protected RAM - unchanged by reset) |
| 2897 | 0x00FF FFFF [End of RAM] |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2898 | |
| 2899 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2900 | System Initialization: |
| 2901 | ---------------------- |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2902 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2903 | In the reset configuration, U-Boot starts at the reset entry point |
Marcel Ziswiler | 11ccc33 | 2008-07-09 08:17:15 +0200 | [diff] [blame] | 2904 | (on most PowerPC systems at address 0x00000100). Because of the reset |
Jeremiah Mahler | b445bbb | 2015-01-04 18:56:50 -0800 | [diff] [blame] | 2905 | configuration for CS0# this is a mirror of the on board Flash memory. |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2906 | To be able to re-map memory U-Boot then jumps to its link address. |
| 2907 | To be able to implement the initialization code in C, a (small!) |
| 2908 | initial stack is set up in the internal Dual Ported RAM (in case CPUs |
Heiko Schocher | 2eb48ff | 2017-06-07 17:33:10 +0200 | [diff] [blame] | 2909 | which provide such a feature like), or in a locked part of the data |
| 2910 | cache. After that, U-Boot initializes the CPU core, the caches and |
| 2911 | the SIU. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2912 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2913 | Next, all (potentially) available memory banks are mapped using a |
| 2914 | preliminary mapping. For example, we put them on 512 MB boundaries |
| 2915 | (multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash |
| 2916 | on 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is |
| 2917 | programmed for SDRAM access. Using the temporary configuration, a |
| 2918 | simple memory test is run that determines the size of the SDRAM |
| 2919 | banks. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2920 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2921 | When there is more than one SDRAM bank, and the banks are of |
| 2922 | different size, the largest is mapped first. For equal size, the first |
| 2923 | bank (CS2#) is mapped first. The first mapping is always for address |
| 2924 | 0x00000000, with any additional banks following immediately to create |
| 2925 | contiguous memory starting from 0. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2926 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2927 | Then, the monitor installs itself at the upper end of the SDRAM area |
| 2928 | and allocates memory for use by malloc() and for the global Board |
| 2929 | Info data; also, the exception vector code is copied to the low RAM |
| 2930 | pages, and the final stack is set up. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2931 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2932 | Only after this relocation will you have a "normal" C environment; |
| 2933 | until that you are restricted in several ways, mostly because you are |
| 2934 | running from ROM, and because the code will have to be relocated to a |
| 2935 | new address in RAM. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2936 | |
| 2937 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2938 | U-Boot Porting Guide: |
| 2939 | ---------------------- |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2940 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2941 | [Based on messages by Jerry Van Baren in the U-Boot-Users mailing |
| 2942 | list, October 2002] |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2943 | |
| 2944 | |
Jerry Van Baren | 6c3fef2 | 2009-07-15 20:42:59 -0400 | [diff] [blame] | 2945 | int main(int argc, char *argv[]) |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2946 | { |
| 2947 | sighandler_t no_more_time; |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2948 | |
Jerry Van Baren | 6c3fef2 | 2009-07-15 20:42:59 -0400 | [diff] [blame] | 2949 | signal(SIGALRM, no_more_time); |
| 2950 | alarm(PROJECT_DEADLINE - toSec (3 * WEEK)); |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2951 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2952 | if (available_money > available_manpower) { |
Jerry Van Baren | 6c3fef2 | 2009-07-15 20:42:59 -0400 | [diff] [blame] | 2953 | Pay consultant to port U-Boot; |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2954 | return 0; |
| 2955 | } |
| 2956 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2957 | Download latest U-Boot source; |
| 2958 | |
Wolfgang Denk | 0668236 | 2008-12-30 22:56:11 +0100 | [diff] [blame] | 2959 | Subscribe to u-boot mailing list; |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2960 | |
Jerry Van Baren | 6c3fef2 | 2009-07-15 20:42:59 -0400 | [diff] [blame] | 2961 | if (clueless) |
| 2962 | email("Hi, I am new to U-Boot, how do I get started?"); |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2963 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2964 | while (learning) { |
| 2965 | Read the README file in the top level directory; |
Naoki Hayama | 047f6ec | 2020-10-08 13:17:16 +0900 | [diff] [blame] | 2966 | Read https://www.denx.de/wiki/bin/view/DULG/Manual; |
Patrick Delaunay | 24bcaec | 2020-02-28 15:18:10 +0100 | [diff] [blame] | 2967 | Read applicable doc/README.*; |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2968 | Read the source, Luke; |
Jerry Van Baren | 6c3fef2 | 2009-07-15 20:42:59 -0400 | [diff] [blame] | 2969 | /* find . -name "*.[chS]" | xargs grep -i <keyword> */ |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2970 | } |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2971 | |
Jerry Van Baren | 6c3fef2 | 2009-07-15 20:42:59 -0400 | [diff] [blame] | 2972 | if (available_money > toLocalCurrency ($2500)) |
| 2973 | Buy a BDI3000; |
| 2974 | else |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2975 | Add a lot of aggravation and time; |
Jerry Van Baren | 6c3fef2 | 2009-07-15 20:42:59 -0400 | [diff] [blame] | 2976 | |
| 2977 | if (a similar board exists) { /* hopefully... */ |
| 2978 | cp -a board/<similar> board/<myboard> |
| 2979 | cp include/configs/<similar>.h include/configs/<myboard>.h |
| 2980 | } else { |
| 2981 | Create your own board support subdirectory; |
| 2982 | Create your own board include/configs/<myboard>.h file; |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 2983 | } |
Jerry Van Baren | 6c3fef2 | 2009-07-15 20:42:59 -0400 | [diff] [blame] | 2984 | Edit new board/<myboard> files |
| 2985 | Edit new include/configs/<myboard>.h |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 2986 | |
Jerry Van Baren | 6c3fef2 | 2009-07-15 20:42:59 -0400 | [diff] [blame] | 2987 | while (!accepted) { |
| 2988 | while (!running) { |
| 2989 | do { |
| 2990 | Add / modify source code; |
| 2991 | } until (compiles); |
| 2992 | Debug; |
| 2993 | if (clueless) |
| 2994 | email("Hi, I am having problems..."); |
| 2995 | } |
| 2996 | Send patch file to the U-Boot email list; |
| 2997 | if (reasonable critiques) |
| 2998 | Incorporate improvements from email list code review; |
| 2999 | else |
| 3000 | Defend code as written; |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 3001 | } |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 3002 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 3003 | return 0; |
| 3004 | } |
| 3005 | |
| 3006 | void no_more_time (int sig) |
| 3007 | { |
| 3008 | hire_a_guru(); |
| 3009 | } |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 3010 | |
| 3011 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 3012 | Coding Standards: |
| 3013 | ----------------- |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 3014 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 3015 | All contributions to U-Boot should conform to the Linux kernel |
Baruch Siach | 659208d | 2017-12-10 17:34:35 +0200 | [diff] [blame] | 3016 | coding style; see the kernel coding style guide at |
| 3017 | https://www.kernel.org/doc/html/latest/process/coding-style.html, and the |
| 3018 | script "scripts/Lindent" in your Linux kernel source directory. |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 3019 | |
Detlev Zundel | 2c05165 | 2006-09-01 15:39:02 +0200 | [diff] [blame] | 3020 | Source files originating from a different project (for example the |
| 3021 | MTD subsystem) are generally exempt from these guidelines and are not |
Jeremiah Mahler | b445bbb | 2015-01-04 18:56:50 -0800 | [diff] [blame] | 3022 | reformatted to ease subsequent migration to newer versions of those |
Detlev Zundel | 2c05165 | 2006-09-01 15:39:02 +0200 | [diff] [blame] | 3023 | sources. |
| 3024 | |
| 3025 | Please note that U-Boot is implemented in C (and to some small parts in |
| 3026 | Assembler); no C++ is used, so please do not use C++ style comments (//) |
| 3027 | in your code. |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 3028 | |
| 3029 | Please also stick to the following formatting rules: |
| 3030 | - remove any trailing white space |
Wolfgang Denk | 7ca9296 | 2011-07-27 10:59:55 +0000 | [diff] [blame] | 3031 | - use TAB characters for indentation and vertical alignment, not spaces |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 3032 | - make sure NOT to use DOS '\r\n' line feeds |
Wolfgang Denk | 7ca9296 | 2011-07-27 10:59:55 +0000 | [diff] [blame] | 3033 | - do not add more than 2 consecutive empty lines to source files |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 3034 | - do not add trailing empty lines to source files |
| 3035 | |
| 3036 | Submissions which do not conform to the standards may be returned |
| 3037 | with a request to reformat the changes. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 3038 | |
| 3039 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 3040 | Submitting Patches: |
| 3041 | ------------------- |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 3042 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 3043 | Since the number of patches for U-Boot is growing, we need to |
| 3044 | establish some rules. Submissions which do not conform to these rules |
| 3045 | may be rejected, even when they contain important and valuable stuff. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 3046 | |
Naoki Hayama | 047f6ec | 2020-10-08 13:17:16 +0900 | [diff] [blame] | 3047 | Please see https://www.denx.de/wiki/U-Boot/Patches for details. |
Wolfgang Denk | 218ca72 | 2008-03-26 10:40:12 +0100 | [diff] [blame] | 3048 | |
Wolfgang Denk | 0668236 | 2008-12-30 22:56:11 +0100 | [diff] [blame] | 3049 | Patches shall be sent to the u-boot mailing list <u-boot@lists.denx.de>; |
S. Lockwood-Childs | 1dade18 | 2017-11-14 22:56:42 -0800 | [diff] [blame] | 3050 | see https://lists.denx.de/listinfo/u-boot |
Wolfgang Denk | 0668236 | 2008-12-30 22:56:11 +0100 | [diff] [blame] | 3051 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 3052 | When you send a patch, please include the following information with |
| 3053 | it: |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 3054 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 3055 | * For bug fixes: a description of the bug and how your patch fixes |
| 3056 | this bug. Please try to include a way of demonstrating that the |
| 3057 | patch actually fixes something. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 3058 | |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 3059 | * For new features: a description of the feature and your |
| 3060 | implementation. |
wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 3061 | |
Robert P. J. Day | 7207b36 | 2015-12-19 07:16:10 -0500 | [diff] [blame] | 3062 | * For major contributions, add a MAINTAINERS file with your |
| 3063 | information and associated file and directory references. |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 3064 | |
Albert ARIBAUD | 27af930 | 2013-09-11 15:52:51 +0200 | [diff] [blame] | 3065 | * When you add support for a new board, don't forget to add a |
| 3066 | maintainer e-mail address to the boards.cfg file, too. |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 3067 | |
| 3068 | * If your patch adds new configuration options, don't forget to |
| 3069 | document these in the README file. |
| 3070 | |
Wolfgang Denk | 218ca72 | 2008-03-26 10:40:12 +0100 | [diff] [blame] | 3071 | * The patch itself. If you are using git (which is *strongly* |
| 3072 | recommended) you can easily generate the patch using the |
Wolfgang Denk | 7ca9296 | 2011-07-27 10:59:55 +0000 | [diff] [blame] | 3073 | "git format-patch". If you then use "git send-email" to send it to |
Wolfgang Denk | 218ca72 | 2008-03-26 10:40:12 +0100 | [diff] [blame] | 3074 | the U-Boot mailing list, you will avoid most of the common problems |
| 3075 | with some other mail clients. |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 3076 | |
Wolfgang Denk | 218ca72 | 2008-03-26 10:40:12 +0100 | [diff] [blame] | 3077 | If you cannot use git, use "diff -purN OLD NEW". If your version of |
| 3078 | diff does not support these options, then get the latest version of |
| 3079 | GNU diff. |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 3080 | |
Wolfgang Denk | 218ca72 | 2008-03-26 10:40:12 +0100 | [diff] [blame] | 3081 | The current directory when running this command shall be the parent |
| 3082 | directory of the U-Boot source tree (i. e. please make sure that |
| 3083 | your patch includes sufficient directory information for the |
| 3084 | affected files). |
| 3085 | |
| 3086 | We prefer patches as plain text. MIME attachments are discouraged, |
| 3087 | and compressed attachments must not be used. |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 3088 | |
| 3089 | * If one logical set of modifications affects or creates several |
| 3090 | files, all these changes shall be submitted in a SINGLE patch file. |
| 3091 | |
| 3092 | * Changesets that contain different, unrelated modifications shall be |
| 3093 | submitted as SEPARATE patches, one patch per changeset. |
| 3094 | |
| 3095 | |
| 3096 | Notes: |
| 3097 | |
Simon Glass | 6de80f2 | 2016-07-27 20:33:08 -0600 | [diff] [blame] | 3098 | * Before sending the patch, run the buildman script on your patched |
wdenk | 2729af9 | 2004-05-03 20:45:30 +0000 | [diff] [blame] | 3099 | source tree and make sure that no errors or warnings are reported |
| 3100 | for any of the boards. |
| 3101 | |
| 3102 | * Keep your modifications to the necessary minimum: A patch |
| 3103 | containing several unrelated changes or arbitrary reformats will be |
| 3104 | returned with a request to re-formatting / split it. |
| 3105 | |
| 3106 | * If you modify existing code, make sure that your new code does not |
| 3107 | add to the memory footprint of the code ;-) Small is beautiful! |
| 3108 | When adding new features, these should compile conditionally only |
| 3109 | (using #ifdef), and the resulting code with the new feature |
| 3110 | disabled must not need more memory than the old code without your |
| 3111 | modification. |
wdenk | 90dc670 | 2005-05-03 14:12:25 +0000 | [diff] [blame] | 3112 | |
Wolfgang Denk | 0668236 | 2008-12-30 22:56:11 +0100 | [diff] [blame] | 3113 | * Remember that there is a size limit of 100 kB per message on the |
| 3114 | u-boot mailing list. Bigger patches will be moderated. If they are |
| 3115 | reasonable and not too big, they will be acknowledged. But patches |
| 3116 | bigger than the size limit should be avoided. |