| # |
| # (C) Copyright 2000 - 2013 |
| # Wolfgang Denk, DENX Software Engineering, wd@denx.de. |
| # |
| # SPDX-License-Identifier: GPL-2.0+ |
| # |
| |
| Summary: |
| ======== |
| |
| This directory contains the source code for U-Boot, a boot loader for |
| Embedded boards based on PowerPC, ARM, MIPS and several other |
| processors, which can be installed in a boot ROM and used to |
| initialize and test the hardware or to download and run application |
| code. |
| |
| The development of U-Boot is closely related to Linux: some parts of |
| the source code originate in the Linux source tree, we have some |
| header files in common, and special provision has been made to |
| support booting of Linux images. |
| |
| Some attention has been paid to make this software easily |
| configurable and extendable. For instance, all monitor commands are |
| implemented with the same call interface, so that it's very easy to |
| add new commands. Also, instead of permanently adding rarely used |
| code (for instance hardware test utilities) to the monitor, you can |
| load and run it dynamically. |
| |
| |
| Status: |
| ======= |
| |
| In general, all boards for which a configuration option exists in the |
| Makefile have been tested to some extent and can be considered |
| "working". In fact, many of them are used in production systems. |
| |
| In case of problems see the CHANGELOG file to find out who contributed |
| the specific port. In addition, there are various MAINTAINERS files |
| scattered throughout the U-Boot source identifying the people or |
| companies responsible for various boards and subsystems. |
| |
| Note: As of August, 2010, there is no longer a CHANGELOG file in the |
| actual U-Boot source tree; however, it can be created dynamically |
| from the Git log using: |
| |
| make CHANGELOG |
| |
| |
| Where to get help: |
| ================== |
| |
| In case you have questions about, problems with or contributions for |
| U-Boot, you should send a message to the U-Boot mailing list at |
| <u-boot@lists.denx.de>. There is also an archive of previous traffic |
| on the mailing list - please search the archive before asking FAQ's. |
| Please see http://lists.denx.de/pipermail/u-boot and |
| http://dir.gmane.org/gmane.comp.boot-loaders.u-boot |
| |
| |
| Where to get source code: |
| ========================= |
| |
| The U-Boot source code is maintained in the Git repository at |
| git://www.denx.de/git/u-boot.git ; you can browse it online at |
| http://www.denx.de/cgi-bin/gitweb.cgi?p=u-boot.git;a=summary |
| |
| The "snapshot" links on this page allow you to download tarballs of |
| any version you might be interested in. Official releases are also |
| available for FTP download from the ftp://ftp.denx.de/pub/u-boot/ |
| directory. |
| |
| Pre-built (and tested) images are available from |
| ftp://ftp.denx.de/pub/u-boot/images/ |
| |
| |
| Where we come from: |
| =================== |
| |
| - start from 8xxrom sources |
| - create PPCBoot project (http://sourceforge.net/projects/ppcboot) |
| - clean up code |
| - make it easier to add custom boards |
| - make it possible to add other [PowerPC] CPUs |
| - extend functions, especially: |
| * Provide extended interface to Linux boot loader |
| * S-Record download |
| * network boot |
| * PCMCIA / CompactFlash / ATA disk / SCSI ... boot |
| - create ARMBoot project (http://sourceforge.net/projects/armboot) |
| - add other CPU families (starting with ARM) |
| - create U-Boot project (http://sourceforge.net/projects/u-boot) |
| - current project page: see http://www.denx.de/wiki/U-Boot |
| |
| |
| Names and Spelling: |
| =================== |
| |
| The "official" name of this project is "Das U-Boot". The spelling |
| "U-Boot" shall be used in all written text (documentation, comments |
| in source files etc.). Example: |
| |
| This is the README file for the U-Boot project. |
| |
| File names etc. shall be based on the string "u-boot". Examples: |
| |
| include/asm-ppc/u-boot.h |
| |
| #include <asm/u-boot.h> |
| |
| Variable names, preprocessor constants etc. shall be either based on |
| the string "u_boot" or on "U_BOOT". Example: |
| |
| U_BOOT_VERSION u_boot_logo |
| IH_OS_U_BOOT u_boot_hush_start |
| |
| |
| Versioning: |
| =========== |
| |
| Starting with the release in October 2008, the names of the releases |
| were changed from numerical release numbers without deeper meaning |
| into a time stamp based numbering. Regular releases are identified by |
| names consisting of the calendar year and month of the release date. |
| Additional fields (if present) indicate release candidates or bug fix |
| releases in "stable" maintenance trees. |
| |
| Examples: |
| U-Boot v2009.11 - Release November 2009 |
| U-Boot v2009.11.1 - Release 1 in version November 2009 stable tree |
| U-Boot v2010.09-rc1 - Release candidate 1 for September 2010 release |
| |
| |
| Directory Hierarchy: |
| ==================== |
| |
| /arch Architecture specific files |
| /arc Files generic to ARC architecture |
| /arm Files generic to ARM architecture |
| /m68k Files generic to m68k architecture |
| /microblaze Files generic to microblaze architecture |
| /mips Files generic to MIPS architecture |
| /nds32 Files generic to NDS32 architecture |
| /nios2 Files generic to Altera NIOS2 architecture |
| /openrisc Files generic to OpenRISC architecture |
| /powerpc Files generic to PowerPC architecture |
| /riscv Files generic to RISC-V architecture |
| /sandbox Files generic to HW-independent "sandbox" |
| /sh Files generic to SH architecture |
| /x86 Files generic to x86 architecture |
| /api Machine/arch independent API for external apps |
| /board Board dependent files |
| /cmd U-Boot commands functions |
| /common Misc architecture independent functions |
| /configs Board default configuration files |
| /disk Code for disk drive partition handling |
| /doc Documentation (don't expect too much) |
| /drivers Commonly used device drivers |
| /dts Contains Makefile for building internal U-Boot fdt. |
| /examples Example code for standalone applications, etc. |
| /fs Filesystem code (cramfs, ext2, jffs2, etc.) |
| /include Header Files |
| /lib Library routines generic to all architectures |
| /Licenses Various license files |
| /net Networking code |
| /post Power On Self Test |
| /scripts Various build scripts and Makefiles |
| /test Various unit test files |
| /tools Tools to build S-Record or U-Boot images, etc. |
| |
| Software Configuration: |
| ======================= |
| |
| Configuration is usually done using C preprocessor defines; the |
| rationale behind that is to avoid dead code whenever possible. |
| |
| There are two classes of configuration variables: |
| |
| * Configuration _OPTIONS_: |
| These are selectable by the user and have names beginning with |
| "CONFIG_". |
| |
| * Configuration _SETTINGS_: |
| These depend on the hardware etc. and should not be meddled with if |
| you don't know what you're doing; they have names beginning with |
| "CONFIG_SYS_". |
| |
| Previously, all configuration was done by hand, which involved creating |
| symbolic links and editing configuration files manually. More recently, |
| U-Boot has added the Kbuild infrastructure used by the Linux kernel, |
| allowing you to use the "make menuconfig" command to configure your |
| build. |
| |
| |
| Selection of Processor Architecture and Board Type: |
| --------------------------------------------------- |
| |
| For all supported boards there are ready-to-use default |
| configurations available; just type "make <board_name>_defconfig". |
| |
| Example: For a TQM823L module type: |
| |
| cd u-boot |
| make TQM823L_defconfig |
| |
| Note: If you're looking for the default configuration file for a board |
| you're sure used to be there but is now missing, check the file |
| doc/README.scrapyard for a list of no longer supported boards. |
| |
| Sandbox Environment: |
| -------------------- |
| |
| U-Boot can be built natively to run on a Linux host using the 'sandbox' |
| board. This allows feature development which is not board- or architecture- |
| specific to be undertaken on a native platform. The sandbox is also used to |
| run some of U-Boot's tests. |
| |
| See board/sandbox/README.sandbox for more details. |
| |
| |
| Board Initialisation Flow: |
| -------------------------- |
| |
| This is the intended start-up flow for boards. This should apply for both |
| SPL and U-Boot proper (i.e. they both follow the same rules). |
| |
| Note: "SPL" stands for "Secondary Program Loader," which is explained in |
| more detail later in this file. |
| |
| At present, SPL mostly uses a separate code path, but the function names |
| and roles of each function are the same. Some boards or architectures |
| may not conform to this. At least most ARM boards which use |
| CONFIG_SPL_FRAMEWORK conform to this. |
| |
| Execution typically starts with an architecture-specific (and possibly |
| CPU-specific) start.S file, such as: |
| |
| - arch/arm/cpu/armv7/start.S |
| - arch/powerpc/cpu/mpc83xx/start.S |
| - arch/mips/cpu/start.S |
| |
| and so on. From there, three functions are called; the purpose and |
| limitations of each of these functions are described below. |
| |
| lowlevel_init(): |
| - purpose: essential init to permit execution to reach board_init_f() |
| - no global_data or BSS |
| - there is no stack (ARMv7 may have one but it will soon be removed) |
| - must not set up SDRAM or use console |
| - must only do the bare minimum to allow execution to continue to |
| board_init_f() |
| - this is almost never needed |
| - return normally from this function |
| |
| board_init_f(): |
| - purpose: set up the machine ready for running board_init_r(): |
| i.e. SDRAM and serial UART |
| - global_data is available |
| - stack is in SRAM |
| - BSS is not available, so you cannot use global/static variables, |
| only stack variables and global_data |
| |
| Non-SPL-specific notes: |
| - dram_init() is called to set up DRAM. If already done in SPL this |
| can do nothing |
| |
| SPL-specific notes: |
| - you can override the entire board_init_f() function with your own |
| version as needed. |
| - preloader_console_init() can be called here in extremis |
| - should set up SDRAM, and anything needed to make the UART work |
| - these is no need to clear BSS, it will be done by crt0.S |
| - must return normally from this function (don't call board_init_r() |
| directly) |
| |
| Here the BSS is cleared. For SPL, if CONFIG_SPL_STACK_R is defined, then at |
| this point the stack and global_data are relocated to below |
| CONFIG_SPL_STACK_R_ADDR. For non-SPL, U-Boot is relocated to run at the top of |
| memory. |
| |
| board_init_r(): |
| - purpose: main execution, common code |
| - global_data is available |
| - SDRAM is available |
| - BSS is available, all static/global variables can be used |
| - execution eventually continues to main_loop() |
| |
| Non-SPL-specific notes: |
| - U-Boot is relocated to the top of memory and is now running from |
| there. |
| |
| SPL-specific notes: |
| - stack is optionally in SDRAM, if CONFIG_SPL_STACK_R is defined and |
| CONFIG_SPL_STACK_R_ADDR points into SDRAM |
| - preloader_console_init() can be called here - typically this is |
| done by selecting CONFIG_SPL_BOARD_INIT and then supplying a |
| spl_board_init() function containing this call |
| - loads U-Boot or (in falcon mode) Linux |
| |
| |
| |
| Configuration Options: |
| ---------------------- |
| |
| Configuration depends on the combination of board and CPU type; all |
| such information is kept in a configuration file |
| "include/configs/<board_name>.h". |
| |
| Example: For a TQM823L module, all configuration settings are in |
| "include/configs/TQM823L.h". |
| |
| |
| Many of the options are named exactly as the corresponding Linux |
| kernel configuration options. The intention is to make it easier to |
| build a config tool - later. |
| |
| - ARM Platform Bus Type(CCI): |
| CoreLink Cache Coherent Interconnect (CCI) is ARM BUS which |
| provides full cache coherency between two clusters of multi-core |
| CPUs and I/O coherency for devices and I/O masters |
| |
| CONFIG_SYS_FSL_HAS_CCI400 |
| |
| Defined For SoC that has cache coherent interconnect |
| CCN-400 |
| |
| CONFIG_SYS_FSL_HAS_CCN504 |
| |
| Defined for SoC that has cache coherent interconnect CCN-504 |
| |
| The following options need to be configured: |
| |
| - CPU Type: Define exactly one, e.g. CONFIG_MPC85XX. |
| |
| - Board Type: Define exactly one, e.g. CONFIG_MPC8540ADS. |
| |
| - Marvell Family Member |
| CONFIG_SYS_MVFS - define it if you want to enable |
| multiple fs option at one time |
| for marvell soc family |
| |
| - 85xx CPU Options: |
| CONFIG_SYS_PPC64 |
| |
| Specifies that the core is a 64-bit PowerPC implementation (implements |
| the "64" category of the Power ISA). This is necessary for ePAPR |
| compliance, among other possible reasons. |
| |
| CONFIG_SYS_FSL_TBCLK_DIV |
| |
| Defines the core time base clock divider ratio compared to the |
| system clock. On most PQ3 devices this is 8, on newer QorIQ |
| devices it can be 16 or 32. The ratio varies from SoC to Soc. |
| |
| CONFIG_SYS_FSL_PCIE_COMPAT |
| |
| Defines the string to utilize when trying to match PCIe device |
| tree nodes for the given platform. |
| |
| CONFIG_SYS_FSL_ERRATUM_A004510 |
| |
| Enables a workaround for erratum A004510. If set, |
| then CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV and |
| CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY must be set. |
| |
| CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV |
| CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV2 (optional) |
| |
| Defines one or two SoC revisions (low 8 bits of SVR) |
| for which the A004510 workaround should be applied. |
| |
| The rest of SVR is either not relevant to the decision |
| of whether the erratum is present (e.g. p2040 versus |
| p2041) or is implied by the build target, which controls |
| whether CONFIG_SYS_FSL_ERRATUM_A004510 is set. |
| |
| See Freescale App Note 4493 for more information about |
| this erratum. |
| |
| CONFIG_A003399_NOR_WORKAROUND |
| Enables a workaround for IFC erratum A003399. It is only |
| required during NOR boot. |
| |
| CONFIG_A008044_WORKAROUND |
| Enables a workaround for T1040/T1042 erratum A008044. It is only |
| required during NAND boot and valid for Rev 1.0 SoC revision |
| |
| CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY |
| |
| This is the value to write into CCSR offset 0x18600 |
| according to the A004510 workaround. |
| |
| CONFIG_SYS_FSL_DSP_DDR_ADDR |
| This value denotes start offset of DDR memory which is |
| connected exclusively to the DSP cores. |
| |
| CONFIG_SYS_FSL_DSP_M2_RAM_ADDR |
| This value denotes start offset of M2 memory |
| which is directly connected to the DSP core. |
| |
| CONFIG_SYS_FSL_DSP_M3_RAM_ADDR |
| This value denotes start offset of M3 memory which is directly |
| connected to the DSP core. |
| |
| CONFIG_SYS_FSL_DSP_CCSRBAR_DEFAULT |
| This value denotes start offset of DSP CCSR space. |
| |
| CONFIG_SYS_FSL_SINGLE_SOURCE_CLK |
| Single Source Clock is clocking mode present in some of FSL SoC's. |
| In this mode, a single differential clock is used to supply |
| clocks to the sysclock, ddrclock and usbclock. |
| |
| CONFIG_SYS_CPC_REINIT_F |
| This CONFIG is defined when the CPC is configured as SRAM at the |
| time of U-Boot entry and is required to be re-initialized. |
| |
| CONFIG_DEEP_SLEEP |
| Indicates this SoC supports deep sleep feature. If deep sleep is |
| supported, core will start to execute uboot when wakes up. |
| |
| - Generic CPU options: |
| CONFIG_SYS_BIG_ENDIAN, CONFIG_SYS_LITTLE_ENDIAN |
| |
| Defines the endianess of the CPU. Implementation of those |
| values is arch specific. |
| |
| CONFIG_SYS_FSL_DDR |
| Freescale DDR driver in use. This type of DDR controller is |
| found in mpc83xx, mpc85xx, mpc86xx as well as some ARM core |
| SoCs. |
| |
| CONFIG_SYS_FSL_DDR_ADDR |
| Freescale DDR memory-mapped register base. |
| |
| CONFIG_SYS_FSL_DDR_EMU |
| Specify emulator support for DDR. Some DDR features such as |
| deskew training are not available. |
| |
| CONFIG_SYS_FSL_DDRC_GEN1 |
| Freescale DDR1 controller. |
| |
| CONFIG_SYS_FSL_DDRC_GEN2 |
| Freescale DDR2 controller. |
| |
| CONFIG_SYS_FSL_DDRC_GEN3 |
| Freescale DDR3 controller. |
| |
| CONFIG_SYS_FSL_DDRC_GEN4 |
| Freescale DDR4 controller. |
| |
| CONFIG_SYS_FSL_DDRC_ARM_GEN3 |
| Freescale DDR3 controller for ARM-based SoCs. |
| |
| CONFIG_SYS_FSL_DDR1 |
| Board config to use DDR1. It can be enabled for SoCs with |
| Freescale DDR1 or DDR2 controllers, depending on the board |
| implemetation. |
| |
| CONFIG_SYS_FSL_DDR2 |
| Board config to use DDR2. It can be enabled for SoCs with |
| Freescale DDR2 or DDR3 controllers, depending on the board |
| implementation. |
| |
| CONFIG_SYS_FSL_DDR3 |
| Board config to use DDR3. It can be enabled for SoCs with |
| Freescale DDR3 or DDR3L controllers. |
| |
| CONFIG_SYS_FSL_DDR3L |
| Board config to use DDR3L. It can be enabled for SoCs with |
| DDR3L controllers. |
| |
| CONFIG_SYS_FSL_DDR4 |
| Board config to use DDR4. It can be enabled for SoCs with |
| DDR4 controllers. |
| |
| CONFIG_SYS_FSL_IFC_BE |
| Defines the IFC controller register space as Big Endian |
| |
| CONFIG_SYS_FSL_IFC_LE |
| Defines the IFC controller register space as Little Endian |
| |
| CONFIG_SYS_FSL_IFC_CLK_DIV |
| Defines divider of platform clock(clock input to IFC controller). |
| |
| CONFIG_SYS_FSL_LBC_CLK_DIV |
| Defines divider of platform clock(clock input to eLBC controller). |
| |
| CONFIG_SYS_FSL_PBL_PBI |
| It enables addition of RCW (Power on reset configuration) in built image. |
| Please refer doc/README.pblimage for more details |
| |
| CONFIG_SYS_FSL_PBL_RCW |
| It adds PBI(pre-boot instructions) commands in u-boot build image. |
| PBI commands can be used to configure SoC before it starts the execution. |
| Please refer doc/README.pblimage for more details |
| |
| CONFIG_SPL_FSL_PBL |
| It adds a target to create boot binary having SPL binary in PBI format |
| concatenated with u-boot binary. |
| |
| CONFIG_SYS_FSL_DDR_BE |
| Defines the DDR controller register space as Big Endian |
| |
| CONFIG_SYS_FSL_DDR_LE |
| Defines the DDR controller register space as Little Endian |
| |
| CONFIG_SYS_FSL_DDR_SDRAM_BASE_PHY |
| Physical address from the view of DDR controllers. It is the |
| same as CONFIG_SYS_DDR_SDRAM_BASE for all Power SoCs. But |
| it could be different for ARM SoCs. |
| |
| CONFIG_SYS_FSL_DDR_INTLV_256B |
| DDR controller interleaving on 256-byte. This is a special |
| interleaving mode, handled by Dickens for Freescale layerscape |
| SoCs with ARM core. |
| |
| CONFIG_SYS_FSL_DDR_MAIN_NUM_CTRLS |
| Number of controllers used as main memory. |
| |
| CONFIG_SYS_FSL_OTHER_DDR_NUM_CTRLS |
| Number of controllers used for other than main memory. |
| |
| CONFIG_SYS_FSL_HAS_DP_DDR |
| Defines the SoC has DP-DDR used for DPAA. |
| |
| CONFIG_SYS_FSL_SEC_BE |
| Defines the SEC controller register space as Big Endian |
| |
| CONFIG_SYS_FSL_SEC_LE |
| Defines the SEC controller register space as Little Endian |
| |
| - MIPS CPU options: |
| CONFIG_SYS_INIT_SP_OFFSET |
| |
| Offset relative to CONFIG_SYS_SDRAM_BASE for initial stack |
| pointer. This is needed for the temporary stack before |
| relocation. |
| |
| CONFIG_SYS_MIPS_CACHE_MODE |
| |
| Cache operation mode for the MIPS CPU. |
| See also arch/mips/include/asm/mipsregs.h. |
| Possible values are: |
| CONF_CM_CACHABLE_NO_WA |
| CONF_CM_CACHABLE_WA |
| CONF_CM_UNCACHED |
| CONF_CM_CACHABLE_NONCOHERENT |
| CONF_CM_CACHABLE_CE |
| CONF_CM_CACHABLE_COW |
| CONF_CM_CACHABLE_CUW |
| CONF_CM_CACHABLE_ACCELERATED |
| |
| CONFIG_SYS_XWAY_EBU_BOOTCFG |
| |
| Special option for Lantiq XWAY SoCs for booting from NOR flash. |
| See also arch/mips/cpu/mips32/start.S. |
| |
| CONFIG_XWAY_SWAP_BYTES |
| |
| Enable compilation of tools/xway-swap-bytes needed for Lantiq |
| XWAY SoCs for booting from NOR flash. The U-Boot image needs to |
| be swapped if a flash programmer is used. |
| |
| - ARM options: |
| CONFIG_SYS_EXCEPTION_VECTORS_HIGH |
| |
| Select high exception vectors of the ARM core, e.g., do not |
| clear the V bit of the c1 register of CP15. |
| |
| COUNTER_FREQUENCY |
| Generic timer clock source frequency. |
| |
| COUNTER_FREQUENCY_REAL |
| Generic timer clock source frequency if the real clock is |
| different from COUNTER_FREQUENCY, and can only be determined |
| at run time. |
| |
| - Tegra SoC options: |
| CONFIG_TEGRA_SUPPORT_NON_SECURE |
| |
| Support executing U-Boot in non-secure (NS) mode. Certain |
| impossible actions will be skipped if the CPU is in NS mode, |
| such as ARM architectural timer initialization. |
| |
| - Linux Kernel Interface: |
| CONFIG_CLOCKS_IN_MHZ |
| |
| U-Boot stores all clock information in Hz |
| internally. For binary compatibility with older Linux |
| kernels (which expect the clocks passed in the |
| bd_info data to be in MHz) the environment variable |
| "clocks_in_mhz" can be defined so that U-Boot |
| converts clock data to MHZ before passing it to the |
| Linux kernel. |
| When CONFIG_CLOCKS_IN_MHZ is defined, a definition of |
| "clocks_in_mhz=1" is automatically included in the |
| default environment. |
| |
| CONFIG_MEMSIZE_IN_BYTES [relevant for MIPS only] |
| |
| When transferring memsize parameter to Linux, some versions |
| expect it to be in bytes, others in MB. |
| Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes. |
| |
| CONFIG_OF_LIBFDT |
| |
| New kernel versions are expecting firmware settings to be |
| passed using flattened device trees (based on open firmware |
| concepts). |
| |
| CONFIG_OF_LIBFDT |
| * New libfdt-based support |
| * Adds the "fdt" command |
| * The bootm command automatically updates the fdt |
| |
| OF_TBCLK - The timebase frequency. |
| OF_STDOUT_PATH - The path to the console device |
| |
| boards with QUICC Engines require OF_QE to set UCC MAC |
| addresses |
| |
| CONFIG_OF_BOARD_SETUP |
| |
| Board code has addition modification that it wants to make |
| to the flat device tree before handing it off to the kernel |
| |
| CONFIG_OF_SYSTEM_SETUP |
| |
| Other code has addition modification that it wants to make |
| to the flat device tree before handing it off to the kernel. |
| This causes ft_system_setup() to be called before booting |
| the kernel. |
| |
| CONFIG_OF_IDE_FIXUP |
| |
| U-Boot can detect if an IDE device is present or not. |
| If not, and this new config option is activated, U-Boot |
| removes the ATA node from the DTS before booting Linux, |
| so the Linux IDE driver does not probe the device and |
| crash. This is needed for buggy hardware (uc101) where |
| no pull down resistor is connected to the signal IDE5V_DD7. |
| |
| CONFIG_MACH_TYPE [relevant for ARM only][mandatory] |
| |
| This setting is mandatory for all boards that have only one |
| machine type and must be used to specify the machine type |
| number as it appears in the ARM machine registry |
| (see http://www.arm.linux.org.uk/developer/machines/). |
| Only boards that have multiple machine types supported |
| in a single configuration file and the machine type is |
| runtime discoverable, do not have to use this setting. |
| |
| - vxWorks boot parameters: |
| |
| bootvx constructs a valid bootline using the following |
| environments variables: bootdev, bootfile, ipaddr, netmask, |
| serverip, gatewayip, hostname, othbootargs. |
| It loads the vxWorks image pointed bootfile. |
| |
| Note: If a "bootargs" environment is defined, it will overwride |
| the defaults discussed just above. |
| |
| - Cache Configuration: |
| CONFIG_SYS_ICACHE_OFF - Do not enable instruction cache in U-Boot |
| CONFIG_SYS_DCACHE_OFF - Do not enable data cache in U-Boot |
| CONFIG_SYS_L2CACHE_OFF- Do not enable L2 cache in U-Boot |
| |
| - Cache Configuration for ARM: |
| CONFIG_SYS_L2_PL310 - Enable support for ARM PL310 L2 cache |
| controller |
| CONFIG_SYS_PL310_BASE - Physical base address of PL310 |
| controller register space |
| |
| - Serial Ports: |
| CONFIG_PL010_SERIAL |
| |
| Define this if you want support for Amba PrimeCell PL010 UARTs. |
| |
| CONFIG_PL011_SERIAL |
| |
| Define this if you want support for Amba PrimeCell PL011 UARTs. |
| |
| CONFIG_PL011_CLOCK |
| |
| If you have Amba PrimeCell PL011 UARTs, set this variable to |
| the clock speed of the UARTs. |
| |
| CONFIG_PL01x_PORTS |
| |
| If you have Amba PrimeCell PL010 or PL011 UARTs on your board, |
| define this to a list of base addresses for each (supported) |
| port. See e.g. include/configs/versatile.h |
| |
| CONFIG_SERIAL_HW_FLOW_CONTROL |
| |
| Define this variable to enable hw flow control in serial driver. |
| Current user of this option is drivers/serial/nsl16550.c driver |
| |
| - Console Baudrate: |
| CONFIG_BAUDRATE - in bps |
| Select one of the baudrates listed in |
| CONFIG_SYS_BAUDRATE_TABLE, see below. |
| |
| - Autoboot Command: |
| CONFIG_BOOTCOMMAND |
| Only needed when CONFIG_BOOTDELAY is enabled; |
| define a command string that is automatically executed |
| when no character is read on the console interface |
| within "Boot Delay" after reset. |
| |
| CONFIG_RAMBOOT and CONFIG_NFSBOOT |
| The value of these goes into the environment as |
| "ramboot" and "nfsboot" respectively, and can be used |
| as a convenience, when switching between booting from |
| RAM and NFS. |
| |
| - Pre-Boot Commands: |
| CONFIG_PREBOOT |
| |
| When this option is #defined, the existence of the |
| environment variable "preboot" will be checked |
| immediately before starting the CONFIG_BOOTDELAY |
| countdown and/or running the auto-boot command resp. |
| entering interactive mode. |
| |
| This feature is especially useful when "preboot" is |
| automatically generated or modified. For an example |
| see the LWMON board specific code: here "preboot" is |
| modified when the user holds down a certain |
| combination of keys on the (special) keyboard when |
| booting the systems |
| |
| - Serial Download Echo Mode: |
| CONFIG_LOADS_ECHO |
| If defined to 1, all characters received during a |
| serial download (using the "loads" command) are |
| echoed back. This might be needed by some terminal |
| emulations (like "cu"), but may as well just take |
| time on others. This setting #define's the initial |
| value of the "loads_echo" environment variable. |
| |
| - Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined) |
| CONFIG_KGDB_BAUDRATE |
| Select one of the baudrates listed in |
| CONFIG_SYS_BAUDRATE_TABLE, see below. |
| |
| - Removal of commands |
| If no commands are needed to boot, you can disable |
| CONFIG_CMDLINE to remove them. In this case, the command line |
| will not be available, and when U-Boot wants to execute the |
| boot command (on start-up) it will call board_run_command() |
| instead. This can reduce image size significantly for very |
| simple boot procedures. |
| |
| - Regular expression support: |
| CONFIG_REGEX |
| If this variable is defined, U-Boot is linked against |
| the SLRE (Super Light Regular Expression) library, |
| which adds regex support to some commands, as for |
| example "env grep" and "setexpr". |
| |
| - Device tree: |
| CONFIG_OF_CONTROL |
| If this variable is defined, U-Boot will use a device tree |
| to configure its devices, instead of relying on statically |
| compiled #defines in the board file. This option is |
| experimental and only available on a few boards. The device |
| tree is available in the global data as gd->fdt_blob. |
| |
| U-Boot needs to get its device tree from somewhere. This can |
| be done using one of the three options below: |
| |
| CONFIG_OF_EMBED |
| If this variable is defined, U-Boot will embed a device tree |
| binary in its image. This device tree file should be in the |
| board directory and called <soc>-<board>.dts. The binary file |
| is then picked up in board_init_f() and made available through |
| the global data structure as gd->fdt_blob. |
| |
| CONFIG_OF_SEPARATE |
| If this variable is defined, U-Boot will build a device tree |
| binary. It will be called u-boot.dtb. Architecture-specific |
| code will locate it at run-time. Generally this works by: |
| |
| cat u-boot.bin u-boot.dtb >image.bin |
| |
| and in fact, U-Boot does this for you, creating a file called |
| u-boot-dtb.bin which is useful in the common case. You can |
| still use the individual files if you need something more |
| exotic. |
| |
| CONFIG_OF_BOARD |
| If this variable is defined, U-Boot will use the device tree |
| provided by the board at runtime instead of embedding one with |
| the image. Only boards defining board_fdt_blob_setup() support |
| this option (see include/fdtdec.h file). |
| |
| - Watchdog: |
| CONFIG_WATCHDOG |
| If this variable is defined, it enables watchdog |
| support for the SoC. There must be support in the SoC |
| specific code for a watchdog. For the 8xx |
| CPUs, the SIU Watchdog feature is enabled in the SYPCR |
| register. When supported for a specific SoC is |
| available, then no further board specific code should |
| be needed to use it. |
| |
| CONFIG_HW_WATCHDOG |
| When using a watchdog circuitry external to the used |
| SoC, then define this variable and provide board |
| specific code for the "hw_watchdog_reset" function. |
| |
| CONFIG_AT91_HW_WDT_TIMEOUT |
| specify the timeout in seconds. default 2 seconds. |
| |
| - U-Boot Version: |
| CONFIG_VERSION_VARIABLE |
| If this variable is defined, an environment variable |
| named "ver" is created by U-Boot showing the U-Boot |
| version as printed by the "version" command. |
| Any change to this variable will be reverted at the |
| next reset. |
| |
| - Real-Time Clock: |
| |
| When CONFIG_CMD_DATE is selected, the type of the RTC |
| has to be selected, too. Define exactly one of the |
| following options: |
| |
| CONFIG_RTC_PCF8563 - use Philips PCF8563 RTC |
| CONFIG_RTC_MC13XXX - use MC13783 or MC13892 RTC |
| CONFIG_RTC_MC146818 - use MC146818 RTC |
| CONFIG_RTC_DS1307 - use Maxim, Inc. DS1307 RTC |
| CONFIG_RTC_DS1337 - use Maxim, Inc. DS1337 RTC |
| CONFIG_RTC_DS1338 - use Maxim, Inc. DS1338 RTC |
| CONFIG_RTC_DS1339 - use Maxim, Inc. DS1339 RTC |
| CONFIG_RTC_DS164x - use Dallas DS164x RTC |
| CONFIG_RTC_ISL1208 - use Intersil ISL1208 RTC |
| CONFIG_RTC_MAX6900 - use Maxim, Inc. MAX6900 RTC |
| CONFIG_RTC_DS1337_NOOSC - Turn off the OSC output for DS1337 |
| CONFIG_SYS_RV3029_TCR - enable trickle charger on |
| RV3029 RTC. |
| |
| Note that if the RTC uses I2C, then the I2C interface |
| must also be configured. See I2C Support, below. |
| |
| - GPIO Support: |
| CONFIG_PCA953X - use NXP's PCA953X series I2C GPIO |
| |
| The CONFIG_SYS_I2C_PCA953X_WIDTH option specifies a list of |
| chip-ngpio pairs that tell the PCA953X driver the number of |
| pins supported by a particular chip. |
| |
| Note that if the GPIO device uses I2C, then the I2C interface |
| must also be configured. See I2C Support, below. |
| |
| - I/O tracing: |
| When CONFIG_IO_TRACE is selected, U-Boot intercepts all I/O |
| accesses and can checksum them or write a list of them out |
| to memory. See the 'iotrace' command for details. This is |
| useful for testing device drivers since it can confirm that |
| the driver behaves the same way before and after a code |
| change. Currently this is supported on sandbox and arm. To |
| add support for your architecture, add '#include <iotrace.h>' |
| to the bottom of arch/<arch>/include/asm/io.h and test. |
| |
| Example output from the 'iotrace stats' command is below. |
| Note that if the trace buffer is exhausted, the checksum will |
| still continue to operate. |
| |
| iotrace is enabled |
| Start: 10000000 (buffer start address) |
| Size: 00010000 (buffer size) |
| Offset: 00000120 (current buffer offset) |
| Output: 10000120 (start + offset) |
| Count: 00000018 (number of trace records) |
| CRC32: 9526fb66 (CRC32 of all trace records) |
| |
| - Timestamp Support: |
| |
| When CONFIG_TIMESTAMP is selected, the timestamp |
| (date and time) of an image is printed by image |
| commands like bootm or iminfo. This option is |
| automatically enabled when you select CONFIG_CMD_DATE . |
| |
| - Partition Labels (disklabels) Supported: |
| Zero or more of the following: |
| CONFIG_MAC_PARTITION Apple's MacOS partition table. |
| CONFIG_ISO_PARTITION ISO partition table, used on CDROM etc. |
| CONFIG_EFI_PARTITION GPT partition table, common when EFI is the |
| bootloader. Note 2TB partition limit; see |
| disk/part_efi.c |
| CONFIG_MTD_PARTITIONS Memory Technology Device partition table. |
| |
| If IDE or SCSI support is enabled (CONFIG_IDE or |
| CONFIG_SCSI) you must configure support for at |
| least one non-MTD partition type as well. |
| |
| - IDE Reset method: |
| CONFIG_IDE_RESET_ROUTINE - this is defined in several |
| board configurations files but used nowhere! |
| |
| CONFIG_IDE_RESET - is this is defined, IDE Reset will |
| be performed by calling the function |
| ide_set_reset(int reset) |
| which has to be defined in a board specific file |
| |
| - ATAPI Support: |
| CONFIG_ATAPI |
| |
| Set this to enable ATAPI support. |
| |
| - LBA48 Support |
| CONFIG_LBA48 |
| |
| Set this to enable support for disks larger than 137GB |
| Also look at CONFIG_SYS_64BIT_LBA. |
| Whithout these , LBA48 support uses 32bit variables and will 'only' |
| support disks up to 2.1TB. |
| |
| CONFIG_SYS_64BIT_LBA: |
| When enabled, makes the IDE subsystem use 64bit sector addresses. |
| Default is 32bit. |
| |
| - SCSI Support: |
| CONFIG_SYS_SCSI_MAX_LUN [8], CONFIG_SYS_SCSI_MAX_SCSI_ID [7] and |
| CONFIG_SYS_SCSI_MAX_DEVICE [CONFIG_SYS_SCSI_MAX_SCSI_ID * |
| CONFIG_SYS_SCSI_MAX_LUN] can be adjusted to define the |
| maximum numbers of LUNs, SCSI ID's and target |
| devices. |
| |
| The environment variable 'scsidevs' is set to the number of |
| SCSI devices found during the last scan. |
| |
| - NETWORK Support (PCI): |
| CONFIG_E1000 |
| Support for Intel 8254x/8257x gigabit chips. |
| |
| CONFIG_E1000_SPI |
| Utility code for direct access to the SPI bus on Intel 8257x. |
| This does not do anything useful unless you set at least one |
| of CONFIG_CMD_E1000 or CONFIG_E1000_SPI_GENERIC. |
| |
| CONFIG_E1000_SPI_GENERIC |
| Allow generic access to the SPI bus on the Intel 8257x, for |
| example with the "sspi" command. |
| |
| CONFIG_EEPRO100 |
| Support for Intel 82557/82559/82559ER chips. |
| Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM |
| write routine for first time initialisation. |
| |
| CONFIG_TULIP |
| Support for Digital 2114x chips. |
| Optional CONFIG_TULIP_SELECT_MEDIA for board specific |
| modem chip initialisation (KS8761/QS6611). |
| |
| CONFIG_NATSEMI |
| Support for National dp83815 chips. |
| |
| CONFIG_NS8382X |
| Support for National dp8382[01] gigabit chips. |
| |
| - NETWORK Support (other): |
| |
| CONFIG_DRIVER_AT91EMAC |
| Support for AT91RM9200 EMAC. |
| |
| CONFIG_RMII |
| Define this to use reduced MII inteface |
| |
| CONFIG_DRIVER_AT91EMAC_QUIET |
| If this defined, the driver is quiet. |
| The driver doen't show link status messages. |
| |
| CONFIG_CALXEDA_XGMAC |
| Support for the Calxeda XGMAC device |
| |
| CONFIG_LAN91C96 |
| Support for SMSC's LAN91C96 chips. |
| |
| CONFIG_LAN91C96_USE_32_BIT |
| Define this to enable 32 bit addressing |
| |
| CONFIG_SMC91111 |
| Support for SMSC's LAN91C111 chip |
| |
| CONFIG_SMC91111_BASE |
| Define this to hold the physical address |
| of the device (I/O space) |
| |
| CONFIG_SMC_USE_32_BIT |
| Define this if data bus is 32 bits |
| |
| CONFIG_SMC_USE_IOFUNCS |
| Define this to use i/o functions instead of macros |
| (some hardware wont work with macros) |
| |
| CONFIG_DRIVER_TI_EMAC |
| Support for davinci emac |
| |
| CONFIG_SYS_DAVINCI_EMAC_PHY_COUNT |
| Define this if you have more then 3 PHYs. |
| |
| CONFIG_FTGMAC100 |
| Support for Faraday's FTGMAC100 Gigabit SoC Ethernet |
| |
| CONFIG_FTGMAC100_EGIGA |
| Define this to use GE link update with gigabit PHY. |
| Define this if FTGMAC100 is connected to gigabit PHY. |
| If your system has 10/100 PHY only, it might not occur |
| wrong behavior. Because PHY usually return timeout or |
| useless data when polling gigabit status and gigabit |
| control registers. This behavior won't affect the |
| correctnessof 10/100 link speed update. |
| |
| CONFIG_SH_ETHER |
| Support for Renesas on-chip Ethernet controller |
| |
| CONFIG_SH_ETHER_USE_PORT |
| Define the number of ports to be used |
| |
| CONFIG_SH_ETHER_PHY_ADDR |
| Define the ETH PHY's address |
| |
| CONFIG_SH_ETHER_CACHE_WRITEBACK |
| If this option is set, the driver enables cache flush. |
| |
| - PWM Support: |
| CONFIG_PWM_IMX |
| Support for PWM module on the imx6. |
| |
| - TPM Support: |
| CONFIG_TPM |
| Support TPM devices. |
| |
| CONFIG_TPM_TIS_INFINEON |
| Support for Infineon i2c bus TPM devices. Only one device |
| per system is supported at this time. |
| |
| CONFIG_TPM_TIS_I2C_BURST_LIMITATION |
| Define the burst count bytes upper limit |
| |
| CONFIG_TPM_ST33ZP24 |
| Support for STMicroelectronics TPM devices. Requires DM_TPM support. |
| |
| CONFIG_TPM_ST33ZP24_I2C |
| Support for STMicroelectronics ST33ZP24 I2C devices. |
| Requires TPM_ST33ZP24 and I2C. |
| |
| CONFIG_TPM_ST33ZP24_SPI |
| Support for STMicroelectronics ST33ZP24 SPI devices. |
| Requires TPM_ST33ZP24 and SPI. |
| |
| CONFIG_TPM_ATMEL_TWI |
| Support for Atmel TWI TPM device. Requires I2C support. |
| |
| CONFIG_TPM_TIS_LPC |
| Support for generic parallel port TPM devices. Only one device |
| per system is supported at this time. |
| |
| CONFIG_TPM_TIS_BASE_ADDRESS |
| Base address where the generic TPM device is mapped |
| to. Contemporary x86 systems usually map it at |
| 0xfed40000. |
| |
| CONFIG_TPM |
| Define this to enable the TPM support library which provides |
| functional interfaces to some TPM commands. |
| Requires support for a TPM device. |
| |
| CONFIG_TPM_AUTH_SESSIONS |
| Define this to enable authorized functions in the TPM library. |
| Requires CONFIG_TPM and CONFIG_SHA1. |
| |
| - USB Support: |
| At the moment only the UHCI host controller is |
| supported (PIP405, MIP405); define |
| CONFIG_USB_UHCI to enable it. |
| define CONFIG_USB_KEYBOARD to enable the USB Keyboard |
| and define CONFIG_USB_STORAGE to enable the USB |
| storage devices. |
| Note: |
| Supported are USB Keyboards and USB Floppy drives |
| (TEAC FD-05PUB). |
| |
| CONFIG_USB_EHCI_TXFIFO_THRESH enables setting of the |
| txfilltuning field in the EHCI controller on reset. |
| |
| CONFIG_USB_DWC2_REG_ADDR the physical CPU address of the DWC2 |
| HW module registers. |
| |
| - USB Device: |
| Define the below if you wish to use the USB console. |
| Once firmware is rebuilt from a serial console issue the |
| command "setenv stdin usbtty; setenv stdout usbtty" and |
| attach your USB cable. The Unix command "dmesg" should print |
| it has found a new device. The environment variable usbtty |
| can be set to gserial or cdc_acm to enable your device to |
| appear to a USB host as a Linux gserial device or a |
| Common Device Class Abstract Control Model serial device. |
| If you select usbtty = gserial you should be able to enumerate |
| a Linux host by |
| # modprobe usbserial vendor=0xVendorID product=0xProductID |
| else if using cdc_acm, simply setting the environment |
| variable usbtty to be cdc_acm should suffice. The following |
| might be defined in YourBoardName.h |
| |
| CONFIG_USB_DEVICE |
| Define this to build a UDC device |
| |
| CONFIG_USB_TTY |
| Define this to have a tty type of device available to |
| talk to the UDC device |
| |
| CONFIG_USBD_HS |
| Define this to enable the high speed support for usb |
| device and usbtty. If this feature is enabled, a routine |
| int is_usbd_high_speed(void) |
| also needs to be defined by the driver to dynamically poll |
| whether the enumeration has succeded at high speed or full |
| speed. |
| |
| CONFIG_SYS_CONSOLE_IS_IN_ENV |
| Define this if you want stdin, stdout &/or stderr to |
| be set to usbtty. |
| |
| If you have a USB-IF assigned VendorID then you may wish to |
| define your own vendor specific values either in BoardName.h |
| or directly in usbd_vendor_info.h. If you don't define |
| CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME, |
| CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot |
| should pretend to be a Linux device to it's target host. |
| |
| CONFIG_USBD_MANUFACTURER |
| Define this string as the name of your company for |
| - CONFIG_USBD_MANUFACTURER "my company" |
| |
| CONFIG_USBD_PRODUCT_NAME |
| Define this string as the name of your product |
| - CONFIG_USBD_PRODUCT_NAME "acme usb device" |
| |
| CONFIG_USBD_VENDORID |
| Define this as your assigned Vendor ID from the USB |
| Implementors Forum. This *must* be a genuine Vendor ID |
| to avoid polluting the USB namespace. |
| - CONFIG_USBD_VENDORID 0xFFFF |
| |
| CONFIG_USBD_PRODUCTID |
| Define this as the unique Product ID |
| for your device |
| - CONFIG_USBD_PRODUCTID 0xFFFF |
| |
| - ULPI Layer Support: |
| The ULPI (UTMI Low Pin (count) Interface) PHYs are supported via |
| the generic ULPI layer. The generic layer accesses the ULPI PHY |
| via the platform viewport, so you need both the genric layer and |
| the viewport enabled. Currently only Chipidea/ARC based |
| viewport is supported. |
| To enable the ULPI layer support, define CONFIG_USB_ULPI and |
| CONFIG_USB_ULPI_VIEWPORT in your board configuration file. |
| If your ULPI phy needs a different reference clock than the |
| standard 24 MHz then you have to define CONFIG_ULPI_REF_CLK to |
| the appropriate value in Hz. |
| |
| - MMC Support: |
| The MMC controller on the Intel PXA is supported. To |
| enable this define CONFIG_MMC. The MMC can be |
| accessed from the boot prompt by mapping the device |
| to physical memory similar to flash. Command line is |
| enabled with CONFIG_CMD_MMC. The MMC driver also works with |
| the FAT fs. This is enabled with CONFIG_CMD_FAT. |
| |
| CONFIG_SH_MMCIF |
| Support for Renesas on-chip MMCIF controller |
| |
| CONFIG_SH_MMCIF_ADDR |
| Define the base address of MMCIF registers |
| |
| CONFIG_SH_MMCIF_CLK |
| Define the clock frequency for MMCIF |
| |
| CONFIG_SUPPORT_EMMC_BOOT |
| Enable some additional features of the eMMC boot partitions. |
| |
| CONFIG_SUPPORT_EMMC_RPMB |
| Enable the commands for reading, writing and programming the |
| key for the Replay Protection Memory Block partition in eMMC. |
| |
| - USB Device Firmware Update (DFU) class support: |
| CONFIG_DFU_OVER_USB |
| This enables the USB portion of the DFU USB class |
| |
| CONFIG_DFU_MMC |
| This enables support for exposing (e)MMC devices via DFU. |
| |
| CONFIG_DFU_NAND |
| This enables support for exposing NAND devices via DFU. |
| |
| CONFIG_DFU_RAM |
| This enables support for exposing RAM via DFU. |
| Note: DFU spec refer to non-volatile memory usage, but |
| allow usages beyond the scope of spec - here RAM usage, |
| one that would help mostly the developer. |
| |
| CONFIG_SYS_DFU_DATA_BUF_SIZE |
| Dfu transfer uses a buffer before writing data to the |
| raw storage device. Make the size (in bytes) of this buffer |
| configurable. The size of this buffer is also configurable |
| through the "dfu_bufsiz" environment variable. |
| |
| CONFIG_SYS_DFU_MAX_FILE_SIZE |
| When updating files rather than the raw storage device, |
| we use a static buffer to copy the file into and then write |
| the buffer once we've been given the whole file. Define |
| this to the maximum filesize (in bytes) for the buffer. |
| Default is 4 MiB if undefined. |
| |
| DFU_DEFAULT_POLL_TIMEOUT |
| Poll timeout [ms], is the timeout a device can send to the |
| host. The host must wait for this timeout before sending |
| a subsequent DFU_GET_STATUS request to the device. |
| |
| DFU_MANIFEST_POLL_TIMEOUT |
| Poll timeout [ms], which the device sends to the host when |
| entering dfuMANIFEST state. Host waits this timeout, before |
| sending again an USB request to the device. |
| |
| - Journaling Flash filesystem support: |
| CONFIG_JFFS2_NAND |
| Define these for a default partition on a NAND device |
| |
| CONFIG_SYS_JFFS2_FIRST_SECTOR, |
| CONFIG_SYS_JFFS2_FIRST_BANK, CONFIG_SYS_JFFS2_NUM_BANKS |
| Define these for a default partition on a NOR device |
| |
| - Keyboard Support: |
| See Kconfig help for available keyboard drivers. |
| |
| CONFIG_KEYBOARD |
| |
| Define this to enable a custom keyboard support. |
| This simply calls drv_keyboard_init() which must be |
| defined in your board-specific files. This option is deprecated |
| and is only used by novena. For new boards, use driver model |
| instead. |
| |
| - Video support: |
| CONFIG_FSL_DIU_FB |
| Enable the Freescale DIU video driver. Reference boards for |
| SOCs that have a DIU should define this macro to enable DIU |
| support, and should also define these other macros: |
| |
| CONFIG_SYS_DIU_ADDR |
| CONFIG_VIDEO |
| CONFIG_CFB_CONSOLE |
| CONFIG_VIDEO_SW_CURSOR |
| CONFIG_VGA_AS_SINGLE_DEVICE |
| CONFIG_VIDEO_LOGO |
| CONFIG_VIDEO_BMP_LOGO |
| |
| The DIU driver will look for the 'video-mode' environment |
| variable, and if defined, enable the DIU as a console during |
| boot. See the documentation file doc/README.video for a |
| description of this variable. |
| |
| - LCD Support: CONFIG_LCD |
| |
| Define this to enable LCD support (for output to LCD |
| display); also select one of the supported displays |
| by defining one of these: |
| |
| CONFIG_ATMEL_LCD: |
| |
| HITACHI TX09D70VM1CCA, 3.5", 240x320. |
| |
| CONFIG_NEC_NL6448AC33: |
| |
| NEC NL6448AC33-18. Active, color, single scan. |
| |
| CONFIG_NEC_NL6448BC20 |
| |
| NEC NL6448BC20-08. 6.5", 640x480. |
| Active, color, single scan. |
| |
| CONFIG_NEC_NL6448BC33_54 |
| |
| NEC NL6448BC33-54. 10.4", 640x480. |
| Active, color, single scan. |
| |
| CONFIG_SHARP_16x9 |
| |
| Sharp 320x240. Active, color, single scan. |
| It isn't 16x9, and I am not sure what it is. |
| |
| CONFIG_SHARP_LQ64D341 |
| |
| Sharp LQ64D341 display, 640x480. |
| Active, color, single scan. |
| |
| CONFIG_HLD1045 |
| |
| HLD1045 display, 640x480. |
| Active, color, single scan. |
| |
| CONFIG_OPTREX_BW |
| |
| Optrex CBL50840-2 NF-FW 99 22 M5 |
| or |
| Hitachi LMG6912RPFC-00T |
| or |
| Hitachi SP14Q002 |
| |
| 320x240. Black & white. |
| |
| CONFIG_LCD_ALIGNMENT |
| |
| Normally the LCD is page-aligned (typically 4KB). If this is |
| defined then the LCD will be aligned to this value instead. |
| For ARM it is sometimes useful to use MMU_SECTION_SIZE |
| here, since it is cheaper to change data cache settings on |
| a per-section basis. |
| |
| |
| CONFIG_LCD_ROTATION |
| |
| Sometimes, for example if the display is mounted in portrait |
| mode or even if it's mounted landscape but rotated by 180degree, |
| we need to rotate our content of the display relative to the |
| framebuffer, so that user can read the messages which are |
| printed out. |
| Once CONFIG_LCD_ROTATION is defined, the lcd_console will be |
| initialized with a given rotation from "vl_rot" out of |
| "vidinfo_t" which is provided by the board specific code. |
| The value for vl_rot is coded as following (matching to |
| fbcon=rotate:<n> linux-kernel commandline): |
| 0 = no rotation respectively 0 degree |
| 1 = 90 degree rotation |
| 2 = 180 degree rotation |
| 3 = 270 degree rotation |
| |
| If CONFIG_LCD_ROTATION is not defined, the console will be |
| initialized with 0degree rotation. |
| |
| CONFIG_LCD_BMP_RLE8 |
| |
| Support drawing of RLE8-compressed bitmaps on the LCD. |
| |
| CONFIG_I2C_EDID |
| |
| Enables an 'i2c edid' command which can read EDID |
| information over I2C from an attached LCD display. |
| |
| - Splash Screen Support: CONFIG_SPLASH_SCREEN |
| |
| If this option is set, the environment is checked for |
| a variable "splashimage". If found, the usual display |
| of logo, copyright and system information on the LCD |
| is suppressed and the BMP image at the address |
| specified in "splashimage" is loaded instead. The |
| console is redirected to the "nulldev", too. This |
| allows for a "silent" boot where a splash screen is |
| loaded very quickly after power-on. |
| |
| CONFIG_SPLASHIMAGE_GUARD |
| |
| If this option is set, then U-Boot will prevent the environment |
| variable "splashimage" from being set to a problematic address |
| (see doc/README.displaying-bmps). |
| This option is useful for targets where, due to alignment |
| restrictions, an improperly aligned BMP image will cause a data |
| abort. If you think you will not have problems with unaligned |
| accesses (for example because your toolchain prevents them) |
| there is no need to set this option. |
| |
| CONFIG_SPLASH_SCREEN_ALIGN |
| |
| If this option is set the splash image can be freely positioned |
| on the screen. Environment variable "splashpos" specifies the |
| position as "x,y". If a positive number is given it is used as |
| number of pixel from left/top. If a negative number is given it |
| is used as number of pixel from right/bottom. You can also |
| specify 'm' for centering the image. |
| |
| Example: |
| setenv splashpos m,m |
| => image at center of screen |
| |
| setenv splashpos 30,20 |
| => image at x = 30 and y = 20 |
| |
| setenv splashpos -10,m |
| => vertically centered image |
| at x = dspWidth - bmpWidth - 9 |
| |
| - Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP |
| |
| If this option is set, additionally to standard BMP |
| images, gzipped BMP images can be displayed via the |
| splashscreen support or the bmp command. |
| |
| - Run length encoded BMP image (RLE8) support: CONFIG_VIDEO_BMP_RLE8 |
| |
| If this option is set, 8-bit RLE compressed BMP images |
| can be displayed via the splashscreen support or the |
| bmp command. |
| |
| - Compression support: |
| CONFIG_GZIP |
| |
| Enabled by default to support gzip compressed images. |
| |
| CONFIG_BZIP2 |
| |
| If this option is set, support for bzip2 compressed |
| images is included. If not, only uncompressed and gzip |
| compressed images are supported. |
| |
| NOTE: the bzip2 algorithm requires a lot of RAM, so |
| the malloc area (as defined by CONFIG_SYS_MALLOC_LEN) should |
| be at least 4MB. |
| |
| - MII/PHY support: |
| CONFIG_PHY_ADDR |
| |
| The address of PHY on MII bus. |
| |
| CONFIG_PHY_CLOCK_FREQ (ppc4xx) |
| |
| The clock frequency of the MII bus |
| |
| CONFIG_PHY_RESET_DELAY |
| |
| Some PHY like Intel LXT971A need extra delay after |
| reset before any MII register access is possible. |
| For such PHY, set this option to the usec delay |
| required. (minimum 300usec for LXT971A) |
| |
| CONFIG_PHY_CMD_DELAY (ppc4xx) |
| |
| Some PHY like Intel LXT971A need extra delay after |
| command issued before MII status register can be read |
| |
| - IP address: |
| CONFIG_IPADDR |
| |
| Define a default value for the IP address to use for |
| the default Ethernet interface, in case this is not |
| determined through e.g. bootp. |
| (Environment variable "ipaddr") |
| |
| - Server IP address: |
| CONFIG_SERVERIP |
| |
| Defines a default value for the IP address of a TFTP |
| server to contact when using the "tftboot" command. |
| (Environment variable "serverip") |
| |
| CONFIG_KEEP_SERVERADDR |
| |
| Keeps the server's MAC address, in the env 'serveraddr' |
| for passing to bootargs (like Linux's netconsole option) |
| |
| - Gateway IP address: |
| CONFIG_GATEWAYIP |
| |
| Defines a default value for the IP address of the |
| default router where packets to other networks are |
| sent to. |
| (Environment variable "gatewayip") |
| |
| - Subnet mask: |
| CONFIG_NETMASK |
| |
| Defines a default value for the subnet mask (or |
| routing prefix) which is used to determine if an IP |
| address belongs to the local subnet or needs to be |
| forwarded through a router. |
| (Environment variable "netmask") |
| |
| - Multicast TFTP Mode: |
| CONFIG_MCAST_TFTP |
| |
| Defines whether you want to support multicast TFTP as per |
| rfc-2090; for example to work with atftp. Lets lots of targets |
| tftp down the same boot image concurrently. Note: the Ethernet |
| driver in use must provide a function: mcast() to join/leave a |
| multicast group. |
| |
| - BOOTP Recovery Mode: |
| CONFIG_BOOTP_RANDOM_DELAY |
| |
| If you have many targets in a network that try to |
| boot using BOOTP, you may want to avoid that all |
| systems send out BOOTP requests at precisely the same |
| moment (which would happen for instance at recovery |
| from a power failure, when all systems will try to |
| boot, thus flooding the BOOTP server. Defining |
| CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be |
| inserted before sending out BOOTP requests. The |
| following delays are inserted then: |
| |
| 1st BOOTP request: delay 0 ... 1 sec |
| 2nd BOOTP request: delay 0 ... 2 sec |
| 3rd BOOTP request: delay 0 ... 4 sec |
| 4th and following |
| BOOTP requests: delay 0 ... 8 sec |
| |
| CONFIG_BOOTP_ID_CACHE_SIZE |
| |
| BOOTP packets are uniquely identified using a 32-bit ID. The |
| server will copy the ID from client requests to responses and |
| U-Boot will use this to determine if it is the destination of |
| an incoming response. Some servers will check that addresses |
| aren't in use before handing them out (usually using an ARP |
| ping) and therefore take up to a few hundred milliseconds to |
| respond. Network congestion may also influence the time it |
| takes for a response to make it back to the client. If that |
| time is too long, U-Boot will retransmit requests. In order |
| to allow earlier responses to still be accepted after these |
| retransmissions, U-Boot's BOOTP client keeps a small cache of |
| IDs. The CONFIG_BOOTP_ID_CACHE_SIZE controls the size of this |
| cache. The default is to keep IDs for up to four outstanding |
| requests. Increasing this will allow U-Boot to accept offers |
| from a BOOTP client in networks with unusually high latency. |
| |
| - DHCP Advanced Options: |
| You can fine tune the DHCP functionality by defining |
| CONFIG_BOOTP_* symbols: |
| |
| CONFIG_BOOTP_NISDOMAIN |
| CONFIG_BOOTP_BOOTFILESIZE |
| CONFIG_BOOTP_SEND_HOSTNAME |
| CONFIG_BOOTP_NTPSERVER |
| CONFIG_BOOTP_TIMEOFFSET |
| CONFIG_BOOTP_VENDOREX |
| CONFIG_BOOTP_MAY_FAIL |
| |
| CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip |
| environment variable, not the BOOTP server. |
| |
| CONFIG_BOOTP_MAY_FAIL - If the DHCP server is not found |
| after the configured retry count, the call will fail |
| instead of starting over. This can be used to fail over |
| to Link-local IP address configuration if the DHCP server |
| is not available. |
| |
| CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable |
| to do a dynamic update of a DNS server. To do this, they |
| need the hostname of the DHCP requester. |
| If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content |
| of the "hostname" environment variable is passed as |
| option 12 to the DHCP server. |
| |
| CONFIG_BOOTP_DHCP_REQUEST_DELAY |
| |
| A 32bit value in microseconds for a delay between |
| receiving a "DHCP Offer" and sending the "DHCP Request". |
| This fixes a problem with certain DHCP servers that don't |
| respond 100% of the time to a "DHCP request". E.g. On an |
| AT91RM9200 processor running at 180MHz, this delay needed |
| to be *at least* 15,000 usec before a Windows Server 2003 |
| DHCP server would reply 100% of the time. I recommend at |
| least 50,000 usec to be safe. The alternative is to hope |
| that one of the retries will be successful but note that |
| the DHCP timeout and retry process takes a longer than |
| this delay. |
| |
| - Link-local IP address negotiation: |
| Negotiate with other link-local clients on the local network |
| for an address that doesn't require explicit configuration. |
| This is especially useful if a DHCP server cannot be guaranteed |
| to exist in all environments that the device must operate. |
| |
| See doc/README.link-local for more information. |
| |
| - MAC address from environment variables |
| |
| FDT_SEQ_MACADDR_FROM_ENV |
| |
| Fix-up device tree with MAC addresses fetched sequentially from |
| environment variables. This config work on assumption that |
| non-usable ethernet node of device-tree are either not present |
| or their status has been marked as "disabled". |
| |
| - CDP Options: |
| CONFIG_CDP_DEVICE_ID |
| |
| The device id used in CDP trigger frames. |
| |
| CONFIG_CDP_DEVICE_ID_PREFIX |
| |
| A two character string which is prefixed to the MAC address |
| of the device. |
| |
| CONFIG_CDP_PORT_ID |
| |
| A printf format string which contains the ascii name of |
| the port. Normally is set to "eth%d" which sets |
| eth0 for the first Ethernet, eth1 for the second etc. |
| |
| CONFIG_CDP_CAPABILITIES |
| |
| A 32bit integer which indicates the device capabilities; |
| 0x00000010 for a normal host which does not forwards. |
| |
| CONFIG_CDP_VERSION |
| |
| An ascii string containing the version of the software. |
| |
| CONFIG_CDP_PLATFORM |
| |
| An ascii string containing the name of the platform. |
| |
| CONFIG_CDP_TRIGGER |
| |
| A 32bit integer sent on the trigger. |
| |
| CONFIG_CDP_POWER_CONSUMPTION |
| |
| A 16bit integer containing the power consumption of the |
| device in .1 of milliwatts. |
| |
| CONFIG_CDP_APPLIANCE_VLAN_TYPE |
| |
| A byte containing the id of the VLAN. |
| |
| - Status LED: CONFIG_LED_STATUS |
| |
| Several configurations allow to display the current |
| status using a LED. For instance, the LED will blink |
| fast while running U-Boot code, stop blinking as |
| soon as a reply to a BOOTP request was received, and |
| start blinking slow once the Linux kernel is running |
| (supported by a status LED driver in the Linux |
| kernel). Defining CONFIG_LED_STATUS enables this |
| feature in U-Boot. |
| |
| Additional options: |
| |
| CONFIG_LED_STATUS_GPIO |
| The status LED can be connected to a GPIO pin. |
| In such cases, the gpio_led driver can be used as a |
| status LED backend implementation. Define CONFIG_LED_STATUS_GPIO |
| to include the gpio_led driver in the U-Boot binary. |
| |
| CONFIG_GPIO_LED_INVERTED_TABLE |
| Some GPIO connected LEDs may have inverted polarity in which |
| case the GPIO high value corresponds to LED off state and |
| GPIO low value corresponds to LED on state. |
| In such cases CONFIG_GPIO_LED_INVERTED_TABLE may be defined |
| with a list of GPIO LEDs that have inverted polarity. |
| |
| - I2C Support: CONFIG_SYS_I2C |
| |
| This enable the NEW i2c subsystem, and will allow you to use |
| i2c commands at the u-boot command line (as long as you set |
| CONFIG_CMD_I2C in CONFIG_COMMANDS) and communicate with i2c |
| based realtime clock chips or other i2c devices. See |
| common/cmd_i2c.c for a description of the command line |
| interface. |
| |
| ported i2c driver to the new framework: |
| - drivers/i2c/soft_i2c.c: |
| - activate first bus with CONFIG_SYS_I2C_SOFT define |
| CONFIG_SYS_I2C_SOFT_SPEED and CONFIG_SYS_I2C_SOFT_SLAVE |
| for defining speed and slave address |
| - activate second bus with I2C_SOFT_DECLARATIONS2 define |
| CONFIG_SYS_I2C_SOFT_SPEED_2 and CONFIG_SYS_I2C_SOFT_SLAVE_2 |
| for defining speed and slave address |
| - activate third bus with I2C_SOFT_DECLARATIONS3 define |
| CONFIG_SYS_I2C_SOFT_SPEED_3 and CONFIG_SYS_I2C_SOFT_SLAVE_3 |
| for defining speed and slave address |
| - activate fourth bus with I2C_SOFT_DECLARATIONS4 define |
| CONFIG_SYS_I2C_SOFT_SPEED_4 and CONFIG_SYS_I2C_SOFT_SLAVE_4 |
| for defining speed and slave address |
| |
| - drivers/i2c/fsl_i2c.c: |
| - activate i2c driver with CONFIG_SYS_I2C_FSL |
| define CONFIG_SYS_FSL_I2C_OFFSET for setting the register |
| offset CONFIG_SYS_FSL_I2C_SPEED for the i2c speed and |
| CONFIG_SYS_FSL_I2C_SLAVE for the slave addr of the first |
| bus. |
| - If your board supports a second fsl i2c bus, define |
| CONFIG_SYS_FSL_I2C2_OFFSET for the register offset |
| CONFIG_SYS_FSL_I2C2_SPEED for the speed and |
| CONFIG_SYS_FSL_I2C2_SLAVE for the slave address of the |
| second bus. |
| |
| - drivers/i2c/tegra_i2c.c: |
| - activate this driver with CONFIG_SYS_I2C_TEGRA |
| - This driver adds 4 i2c buses with a fix speed from |
| 100000 and the slave addr 0! |
| |
| - drivers/i2c/ppc4xx_i2c.c |
| - activate this driver with CONFIG_SYS_I2C_PPC4XX |
| - CONFIG_SYS_I2C_PPC4XX_CH0 activate hardware channel 0 |
| - CONFIG_SYS_I2C_PPC4XX_CH1 activate hardware channel 1 |
| |
| - drivers/i2c/i2c_mxc.c |
| - activate this driver with CONFIG_SYS_I2C_MXC |
| - enable bus 1 with CONFIG_SYS_I2C_MXC_I2C1 |
| - enable bus 2 with CONFIG_SYS_I2C_MXC_I2C2 |
| - enable bus 3 with CONFIG_SYS_I2C_MXC_I2C3 |
| - enable bus 4 with CONFIG_SYS_I2C_MXC_I2C4 |
| - define speed for bus 1 with CONFIG_SYS_MXC_I2C1_SPEED |
| - define slave for bus 1 with CONFIG_SYS_MXC_I2C1_SLAVE |
| - define speed for bus 2 with CONFIG_SYS_MXC_I2C2_SPEED |
| - define slave for bus 2 with CONFIG_SYS_MXC_I2C2_SLAVE |
| - define speed for bus 3 with CONFIG_SYS_MXC_I2C3_SPEED |
| - define slave for bus 3 with CONFIG_SYS_MXC_I2C3_SLAVE |
| - define speed for bus 4 with CONFIG_SYS_MXC_I2C4_SPEED |
| - define slave for bus 4 with CONFIG_SYS_MXC_I2C4_SLAVE |
| If those defines are not set, default value is 100000 |
| for speed, and 0 for slave. |
| |
| - drivers/i2c/rcar_i2c.c: |
| - activate this driver with CONFIG_SYS_I2C_RCAR |
| - This driver adds 4 i2c buses |
| |
| - CONFIG_SYS_RCAR_I2C0_BASE for setting the register channel 0 |
| - CONFIG_SYS_RCAR_I2C0_SPEED for for the speed channel 0 |
| - CONFIG_SYS_RCAR_I2C1_BASE for setting the register channel 1 |
| - CONFIG_SYS_RCAR_I2C1_SPEED for for the speed channel 1 |
| - CONFIG_SYS_RCAR_I2C2_BASE for setting the register channel 2 |
| - CONFIG_SYS_RCAR_I2C2_SPEED for for the speed channel 2 |
| - CONFIG_SYS_RCAR_I2C3_BASE for setting the register channel 3 |
| - CONFIG_SYS_RCAR_I2C3_SPEED for for the speed channel 3 |
| - CONFIF_SYS_RCAR_I2C_NUM_CONTROLLERS for number of i2c buses |
| |
| - drivers/i2c/sh_i2c.c: |
| - activate this driver with CONFIG_SYS_I2C_SH |
| - This driver adds from 2 to 5 i2c buses |
| |
| - CONFIG_SYS_I2C_SH_BASE0 for setting the register channel 0 |
| - CONFIG_SYS_I2C_SH_SPEED0 for for the speed channel 0 |
| - CONFIG_SYS_I2C_SH_BASE1 for setting the register channel 1 |
| - CONFIG_SYS_I2C_SH_SPEED1 for for the speed channel 1 |
| - CONFIG_SYS_I2C_SH_BASE2 for setting the register channel 2 |
| - CONFIG_SYS_I2C_SH_SPEED2 for for the speed channel 2 |
| - CONFIG_SYS_I2C_SH_BASE3 for setting the register channel 3 |
| - CONFIG_SYS_I2C_SH_SPEED3 for for the speed channel 3 |
| - CONFIG_SYS_I2C_SH_BASE4 for setting the register channel 4 |
| - CONFIG_SYS_I2C_SH_SPEED4 for for the speed channel 4 |
| - CONFIG_SYS_I2C_SH_NUM_CONTROLLERS for number of i2c buses |
| |
| - drivers/i2c/omap24xx_i2c.c |
| - activate this driver with CONFIG_SYS_I2C_OMAP24XX |
| - CONFIG_SYS_OMAP24_I2C_SPEED speed channel 0 |
| - CONFIG_SYS_OMAP24_I2C_SLAVE slave addr channel 0 |
| - CONFIG_SYS_OMAP24_I2C_SPEED1 speed channel 1 |
| - CONFIG_SYS_OMAP24_I2C_SLAVE1 slave addr channel 1 |
| - CONFIG_SYS_OMAP24_I2C_SPEED2 speed channel 2 |
| - CONFIG_SYS_OMAP24_I2C_SLAVE2 slave addr channel 2 |
| - CONFIG_SYS_OMAP24_I2C_SPEED3 speed channel 3 |
| - CONFIG_SYS_OMAP24_I2C_SLAVE3 slave addr channel 3 |
| - CONFIG_SYS_OMAP24_I2C_SPEED4 speed channel 4 |
| - CONFIG_SYS_OMAP24_I2C_SLAVE4 slave addr channel 4 |
| |
| - drivers/i2c/zynq_i2c.c |
| - activate this driver with CONFIG_SYS_I2C_ZYNQ |
| - set CONFIG_SYS_I2C_ZYNQ_SPEED for speed setting |
| - set CONFIG_SYS_I2C_ZYNQ_SLAVE for slave addr |
| |
| - drivers/i2c/s3c24x0_i2c.c: |
| - activate this driver with CONFIG_SYS_I2C_S3C24X0 |
| - This driver adds i2c buses (11 for Exynos5250, Exynos5420 |
| 9 i2c buses for Exynos4 and 1 for S3C24X0 SoCs from Samsung) |
| with a fix speed from 100000 and the slave addr 0! |
| |
| - drivers/i2c/ihs_i2c.c |
| - activate this driver with CONFIG_SYS_I2C_IHS |
| - CONFIG_SYS_I2C_IHS_CH0 activate hardware channel 0 |
| - CONFIG_SYS_I2C_IHS_SPEED_0 speed channel 0 |
| - CONFIG_SYS_I2C_IHS_SLAVE_0 slave addr channel 0 |
| - CONFIG_SYS_I2C_IHS_CH1 activate hardware channel 1 |
| - CONFIG_SYS_I2C_IHS_SPEED_1 speed channel 1 |
| - CONFIG_SYS_I2C_IHS_SLAVE_1 slave addr channel 1 |
| - CONFIG_SYS_I2C_IHS_CH2 activate hardware channel 2 |
| - CONFIG_SYS_I2C_IHS_SPEED_2 speed channel 2 |
| - CONFIG_SYS_I2C_IHS_SLAVE_2 slave addr channel 2 |
| - CONFIG_SYS_I2C_IHS_CH3 activate hardware channel 3 |
| - CONFIG_SYS_I2C_IHS_SPEED_3 speed channel 3 |
| - CONFIG_SYS_I2C_IHS_SLAVE_3 slave addr channel 3 |
| - activate dual channel with CONFIG_SYS_I2C_IHS_DUAL |
| - CONFIG_SYS_I2C_IHS_SPEED_0_1 speed channel 0_1 |
| - CONFIG_SYS_I2C_IHS_SLAVE_0_1 slave addr channel 0_1 |
| - CONFIG_SYS_I2C_IHS_SPEED_1_1 speed channel 1_1 |
| - CONFIG_SYS_I2C_IHS_SLAVE_1_1 slave addr channel 1_1 |
| - CONFIG_SYS_I2C_IHS_SPEED_2_1 speed channel 2_1 |
| - CONFIG_SYS_I2C_IHS_SLAVE_2_1 slave addr channel 2_1 |
| - CONFIG_SYS_I2C_IHS_SPEED_3_1 speed channel 3_1 |
| - CONFIG_SYS_I2C_IHS_SLAVE_3_1 slave addr channel 3_1 |
| |
| additional defines: |
| |
| CONFIG_SYS_NUM_I2C_BUSES |
| Hold the number of i2c buses you want to use. |
| |
| CONFIG_SYS_I2C_DIRECT_BUS |
| define this, if you don't use i2c muxes on your hardware. |
| if CONFIG_SYS_I2C_MAX_HOPS is not defined or == 0 you can |
| omit this define. |
| |
| CONFIG_SYS_I2C_MAX_HOPS |
| define how many muxes are maximal consecutively connected |
| on one i2c bus. If you not use i2c muxes, omit this |
| define. |
| |
| CONFIG_SYS_I2C_BUSES |
| hold a list of buses you want to use, only used if |
| CONFIG_SYS_I2C_DIRECT_BUS is not defined, for example |
| a board with CONFIG_SYS_I2C_MAX_HOPS = 1 and |
| CONFIG_SYS_NUM_I2C_BUSES = 9: |
| |
| CONFIG_SYS_I2C_BUSES {{0, {I2C_NULL_HOP}}, \ |
| {0, {{I2C_MUX_PCA9547, 0x70, 1}}}, \ |
| {0, {{I2C_MUX_PCA9547, 0x70, 2}}}, \ |
| {0, {{I2C_MUX_PCA9547, 0x70, 3}}}, \ |
| {0, {{I2C_MUX_PCA9547, 0x70, 4}}}, \ |
| {0, {{I2C_MUX_PCA9547, 0x70, 5}}}, \ |
| {1, {I2C_NULL_HOP}}, \ |
| {1, {{I2C_MUX_PCA9544, 0x72, 1}}}, \ |
| {1, {{I2C_MUX_PCA9544, 0x72, 2}}}, \ |
| } |
| |
| which defines |
| bus 0 on adapter 0 without a mux |
| bus 1 on adapter 0 with a PCA9547 on address 0x70 port 1 |
| bus 2 on adapter 0 with a PCA9547 on address 0x70 port 2 |
| bus 3 on adapter 0 with a PCA9547 on address 0x70 port 3 |
| bus 4 on adapter 0 with a PCA9547 on address 0x70 port 4 |
| bus 5 on adapter 0 with a PCA9547 on address 0x70 port 5 |
| bus 6 on adapter 1 without a mux |
| bus 7 on adapter 1 with a PCA9544 on address 0x72 port 1 |
| bus 8 on adapter 1 with a PCA9544 on address 0x72 port 2 |
| |
| If you do not have i2c muxes on your board, omit this define. |
| |
| - Legacy I2C Support: |
| If you use the software i2c interface (CONFIG_SYS_I2C_SOFT) |
| then the following macros need to be defined (examples are |
| from include/configs/lwmon.h): |
| |
| I2C_INIT |
| |
| (Optional). Any commands necessary to enable the I2C |
| controller or configure ports. |
| |
| eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |= PB_SCL) |
| |
| I2C_ACTIVE |
| |
| The code necessary to make the I2C data line active |
| (driven). If the data line is open collector, this |
| define can be null. |
| |
| eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |= PB_SDA) |
| |
| I2C_TRISTATE |
| |
| The code necessary to make the I2C data line tri-stated |
| (inactive). If the data line is open collector, this |
| define can be null. |
| |
| eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA) |
| |
| I2C_READ |
| |
| Code that returns true if the I2C data line is high, |
| false if it is low. |
| |
| eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0) |
| |
| I2C_SDA(bit) |
| |
| If <bit> is true, sets the I2C data line high. If it |
| is false, it clears it (low). |
| |
| eg: #define I2C_SDA(bit) \ |
| if(bit) immr->im_cpm.cp_pbdat |= PB_SDA; \ |
| else immr->im_cpm.cp_pbdat &= ~PB_SDA |
| |
| I2C_SCL(bit) |
| |
| If <bit> is true, sets the I2C clock line high. If it |
| is false, it clears it (low). |
| |
| eg: #define I2C_SCL(bit) \ |
| if(bit) immr->im_cpm.cp_pbdat |= PB_SCL; \ |
| else immr->im_cpm.cp_pbdat &= ~PB_SCL |
| |
| I2C_DELAY |
| |
| This delay is invoked four times per clock cycle so this |
| controls the rate of data transfer. The data rate thus |
| is 1 / (I2C_DELAY * 4). Often defined to be something |
| like: |
| |
| #define I2C_DELAY udelay(2) |
| |
| CONFIG_SOFT_I2C_GPIO_SCL / CONFIG_SOFT_I2C_GPIO_SDA |
| |
| If your arch supports the generic GPIO framework (asm/gpio.h), |
| then you may alternatively define the two GPIOs that are to be |
| used as SCL / SDA. Any of the previous I2C_xxx macros will |
| have GPIO-based defaults assigned to them as appropriate. |
| |
| You should define these to the GPIO value as given directly to |
| the generic GPIO functions. |
| |
| CONFIG_SYS_I2C_INIT_BOARD |
| |
| When a board is reset during an i2c bus transfer |
| chips might think that the current transfer is still |
| in progress. On some boards it is possible to access |
| the i2c SCLK line directly, either by using the |
| processor pin as a GPIO or by having a second pin |
| connected to the bus. If this option is defined a |
| custom i2c_init_board() routine in boards/xxx/board.c |
| is run early in the boot sequence. |
| |
| CONFIG_I2C_MULTI_BUS |
| |
| This option allows the use of multiple I2C buses, each of which |
| must have a controller. At any point in time, only one bus is |
| active. To switch to a different bus, use the 'i2c dev' command. |
| Note that bus numbering is zero-based. |
| |
| CONFIG_SYS_I2C_NOPROBES |
| |
| This option specifies a list of I2C devices that will be skipped |
| when the 'i2c probe' command is issued. If CONFIG_I2C_MULTI_BUS |
| is set, specify a list of bus-device pairs. Otherwise, specify |
| a 1D array of device addresses |
| |
| e.g. |
| #undef CONFIG_I2C_MULTI_BUS |
| #define CONFIG_SYS_I2C_NOPROBES {0x50,0x68} |
| |
| will skip addresses 0x50 and 0x68 on a board with one I2C bus |
| |
| #define CONFIG_I2C_MULTI_BUS |
| #define CONFIG_SYS_I2C_NOPROBES {{0,0x50},{0,0x68},{1,0x54}} |
| |
| will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1 |
| |
| CONFIG_SYS_SPD_BUS_NUM |
| |
| If defined, then this indicates the I2C bus number for DDR SPD. |
| If not defined, then U-Boot assumes that SPD is on I2C bus 0. |
| |
| CONFIG_SYS_RTC_BUS_NUM |
| |
| If defined, then this indicates the I2C bus number for the RTC. |
| If not defined, then U-Boot assumes that RTC is on I2C bus 0. |
| |
| CONFIG_SOFT_I2C_READ_REPEATED_START |
| |
| defining this will force the i2c_read() function in |
| the soft_i2c driver to perform an I2C repeated start |
| between writing the address pointer and reading the |
| data. If this define is omitted the default behaviour |
| of doing a stop-start sequence will be used. Most I2C |
| devices can use either method, but some require one or |
| the other. |
| |
| - SPI Support: CONFIG_SPI |
| |
| Enables SPI driver (so far only tested with |
| SPI EEPROM, also an instance works with Crystal A/D and |
| D/As on the SACSng board) |
| |
| CONFIG_SOFT_SPI |
| |
| Enables a software (bit-bang) SPI driver rather than |
| using hardware support. This is a general purpose |
| driver that only requires three general I/O port pins |
| (two outputs, one input) to function. If this is |
| defined, the board configuration must define several |
| SPI configuration items (port pins to use, etc). For |
| an example, see include/configs/sacsng.h. |
| |
| CONFIG_HARD_SPI |
| |
| Enables a hardware SPI driver for general-purpose reads |
| and writes. As with CONFIG_SOFT_SPI, the board configuration |
| must define a list of chip-select function pointers. |
| Currently supported on some MPC8xxx processors. For an |
| example, see include/configs/mpc8349emds.h. |
| |
| CONFIG_SYS_SPI_MXC_WAIT |
| Timeout for waiting until spi transfer completed. |
| default: (CONFIG_SYS_HZ/100) /* 10 ms */ |
| |
| - FPGA Support: CONFIG_FPGA |
| |
| Enables FPGA subsystem. |
| |
| CONFIG_FPGA_<vendor> |
| |
| Enables support for specific chip vendors. |
| (ALTERA, XILINX) |
| |
| CONFIG_FPGA_<family> |
| |
| Enables support for FPGA family. |
| (SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX) |
| |
| CONFIG_FPGA_COUNT |
| |
| Specify the number of FPGA devices to support. |
| |
| CONFIG_SYS_FPGA_PROG_FEEDBACK |
| |
| Enable printing of hash marks during FPGA configuration. |
| |
| CONFIG_SYS_FPGA_CHECK_BUSY |
| |
| Enable checks on FPGA configuration interface busy |
| status by the configuration function. This option |
| will require a board or device specific function to |
| be written. |
| |
| CONFIG_FPGA_DELAY |
| |
| If defined, a function that provides delays in the FPGA |
| configuration driver. |
| |
| CONFIG_SYS_FPGA_CHECK_CTRLC |
| Allow Control-C to interrupt FPGA configuration |
| |
| CONFIG_SYS_FPGA_CHECK_ERROR |
| |
| Check for configuration errors during FPGA bitfile |
| loading. For example, abort during Virtex II |
| configuration if the INIT_B line goes low (which |
| indicated a CRC error). |
| |
| CONFIG_SYS_FPGA_WAIT_INIT |
| |
| Maximum time to wait for the INIT_B line to de-assert |
| after PROB_B has been de-asserted during a Virtex II |
| FPGA configuration sequence. The default time is 500 |
| ms. |
| |
| CONFIG_SYS_FPGA_WAIT_BUSY |
| |
| Maximum time to wait for BUSY to de-assert during |
| Virtex II FPGA configuration. The default is 5 ms. |
| |
| CONFIG_SYS_FPGA_WAIT_CONFIG |
| |
| Time to wait after FPGA configuration. The default is |
| 200 ms. |
| |
| - Configuration Management: |
| CONFIG_BUILD_TARGET |
| |
| Some SoCs need special image types (e.g. U-Boot binary |
| with a special header) as build targets. By defining |
| CONFIG_BUILD_TARGET in the SoC / board header, this |
| special image will be automatically built upon calling |
| make / buildman. |
| |
| CONFIG_IDENT_STRING |
| |
| If defined, this string will be added to the U-Boot |
| version information (U_BOOT_VERSION) |
| |
| - Vendor Parameter Protection: |
| |
| U-Boot considers the values of the environment |
| variables "serial#" (Board Serial Number) and |
| "ethaddr" (Ethernet Address) to be parameters that |
| are set once by the board vendor / manufacturer, and |
| protects these variables from casual modification by |
| the user. Once set, these variables are read-only, |
| and write or delete attempts are rejected. You can |
| change this behaviour: |
| |
| If CONFIG_ENV_OVERWRITE is #defined in your config |
| file, the write protection for vendor parameters is |
| completely disabled. Anybody can change or delete |
| these parameters. |
| |
| Alternatively, if you define _both_ an ethaddr in the |
| default env _and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default |
| Ethernet address is installed in the environment, |
| which can be changed exactly ONCE by the user. [The |
| serial# is unaffected by this, i. e. it remains |
| read-only.] |
| |
| The same can be accomplished in a more flexible way |
| for any variable by configuring the type of access |
| to allow for those variables in the ".flags" variable |
| or define CONFIG_ENV_FLAGS_LIST_STATIC. |
| |
| - Protected RAM: |
| CONFIG_PRAM |
| |
| Define this variable to enable the reservation of |
| "protected RAM", i. e. RAM which is not overwritten |
| by U-Boot. Define CONFIG_PRAM to hold the number of |
| kB you want to reserve for pRAM. You can overwrite |
| this default value by defining an environment |
| variable "pram" to the number of kB you want to |
| reserve. Note that the board info structure will |
| still show the full amount of RAM. If pRAM is |
| reserved, a new environment variable "mem" will |
| automatically be defined to hold the amount of |
| remaining RAM in a form that can be passed as boot |
| argument to Linux, for instance like that: |
| |
| setenv bootargs ... mem=\${mem} |
| saveenv |
| |
| This way you can tell Linux not to use this memory, |
| either, which results in a memory region that will |
| not be affected by reboots. |
| |
| *WARNING* If your board configuration uses automatic |
| detection of the RAM size, you must make sure that |
| this memory test is non-destructive. So far, the |
| following board configurations are known to be |
| "pRAM-clean": |
| |
| IVMS8, IVML24, SPD8xx, |
| HERMES, IP860, RPXlite, LWMON, |
| FLAGADM |
| |
| - Access to physical memory region (> 4GB) |
| Some basic support is provided for operations on memory not |
| normally accessible to U-Boot - e.g. some architectures |
| support access to more than 4GB of memory on 32-bit |
| machines using physical address extension or similar. |
| Define CONFIG_PHYSMEM to access this basic support, which |
| currently only supports clearing the memory. |
| |
| - Error Recovery: |
| CONFIG_NET_RETRY_COUNT |
| |
| This variable defines the number of retries for |
| network operations like ARP, RARP, TFTP, or BOOTP |
| before giving up the operation. If not defined, a |
| default value of 5 is used. |
| |
| CONFIG_ARP_TIMEOUT |
| |
| Timeout waiting for an ARP reply in milliseconds. |
| |
| CONFIG_NFS_TIMEOUT |
| |
| Timeout in milliseconds used in NFS protocol. |
| If you encounter "ERROR: Cannot umount" in nfs command, |
| try longer timeout such as |
| #define CONFIG_NFS_TIMEOUT 10000UL |
| |
| - Command Interpreter: |
| CONFIG_SYS_PROMPT_HUSH_PS2 |
| |
| This defines the secondary prompt string, which is |
| printed when the command interpreter needs more input |
| to complete a command. Usually "> ". |
| |
| Note: |
| |
| In the current implementation, the local variables |
| space and global environment variables space are |
| separated. Local variables are those you define by |
| simply typing `name=value'. To access a local |
| variable later on, you have write `$name' or |
| `${name}'; to execute the contents of a variable |
| directly type `$name' at the command prompt. |
| |
| Global environment variables are those you use |
| setenv/printenv to work with. To run a command stored |
| in such a variable, you need to use the run command, |
| and you must not use the '$' sign to access them. |
| |
| To store commands and special characters in a |
| variable, please use double quotation marks |
| surrounding the whole text of the variable, instead |
| of the backslashes before semicolons and special |
| symbols. |
| |
| - Command Line Editing and History: |
| CONFIG_CMDLINE_PS_SUPPORT |
| |
| Enable support for changing the command prompt string |
| at run-time. Only static string is supported so far. |
| The string is obtained from environment variables PS1 |
| and PS2. |
| |
| - Default Environment: |
| CONFIG_EXTRA_ENV_SETTINGS |
| |
| Define this to contain any number of null terminated |
| strings (variable = value pairs) that will be part of |
| the default environment compiled into the boot image. |
| |
| For example, place something like this in your |
| board's config file: |
| |
| #define CONFIG_EXTRA_ENV_SETTINGS \ |
| "myvar1=value1\0" \ |
| "myvar2=value2\0" |
| |
| Warning: This method is based on knowledge about the |
| internal format how the environment is stored by the |
| U-Boot code. This is NOT an official, exported |
| interface! Although it is unlikely that this format |
| will change soon, there is no guarantee either. |
| You better know what you are doing here. |
| |
| Note: overly (ab)use of the default environment is |
| discouraged. Make sure to check other ways to preset |
| the environment like the "source" command or the |
| boot command first. |
| |
| CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG |
| |
| Define this in order to add variables describing certain |
| run-time determined information about the hardware to the |
| environment. These will be named board_name, board_rev. |
| |
| CONFIG_DELAY_ENVIRONMENT |
| |
| Normally the environment is loaded when the board is |
| initialised so that it is available to U-Boot. This inhibits |
| that so that the environment is not available until |
| explicitly loaded later by U-Boot code. With CONFIG_OF_CONTROL |
| this is instead controlled by the value of |
| /config/load-environment. |
| |
| - Serial Flash support |
| Usage requires an initial 'sf probe' to define the serial |
| flash parameters, followed by read/write/erase/update |
| commands. |
| |
| The following defaults may be provided by the platform |
| to handle the common case when only a single serial |
| flash is present on the system. |
| |
| CONFIG_SF_DEFAULT_BUS Bus identifier |
| CONFIG_SF_DEFAULT_CS Chip-select |
| CONFIG_SF_DEFAULT_MODE (see include/spi.h) |
| CONFIG_SF_DEFAULT_SPEED in Hz |
| |
| |
| - TFTP Fixed UDP Port: |
| CONFIG_TFTP_PORT |
| |
| If this is defined, the environment variable tftpsrcp |
| is used to supply the TFTP UDP source port value. |
| If tftpsrcp isn't defined, the normal pseudo-random port |
| number generator is used. |
| |
| Also, the environment variable tftpdstp is used to supply |
| the TFTP UDP destination port value. If tftpdstp isn't |
| defined, the normal port 69 is used. |
| |
| The purpose for tftpsrcp is to allow a TFTP server to |
| blindly start the TFTP transfer using the pre-configured |
| target IP address and UDP port. This has the effect of |
| "punching through" the (Windows XP) firewall, allowing |
| the remainder of the TFTP transfer to proceed normally. |
| A better solution is to properly configure the firewall, |
| but sometimes that is not allowed. |
| |
| - Show boot progress: |
| CONFIG_SHOW_BOOT_PROGRESS |
| |
| Defining this option allows to add some board- |
| specific code (calling a user-provided function |
| "show_boot_progress(int)") that enables you to show |
| the system's boot progress on some display (for |
| example, some LED's) on your board. At the moment, |
| the following checkpoints are implemented: |
| |
| |
| Legacy uImage format: |
| |
| Arg Where When |
| 1 common/cmd_bootm.c before attempting to boot an image |
| -1 common/cmd_bootm.c Image header has bad magic number |
| 2 common/cmd_bootm.c Image header has correct magic number |
| -2 common/cmd_bootm.c Image header has bad checksum |
| 3 common/cmd_bootm.c Image header has correct checksum |
| -3 common/cmd_bootm.c Image data has bad checksum |
| 4 common/cmd_bootm.c Image data has correct checksum |
| -4 common/cmd_bootm.c Image is for unsupported architecture |
| 5 common/cmd_bootm.c Architecture check OK |
| -5 common/cmd_bootm.c Wrong Image Type (not kernel, multi) |
| 6 common/cmd_bootm.c Image Type check OK |
| -6 common/cmd_bootm.c gunzip uncompression error |
| -7 common/cmd_bootm.c Unimplemented compression type |
| 7 common/cmd_bootm.c Uncompression OK |
| 8 common/cmd_bootm.c No uncompress/copy overwrite error |
| -9 common/cmd_bootm.c Unsupported OS (not Linux, BSD, VxWorks, QNX) |
| |
| 9 common/image.c Start initial ramdisk verification |
| -10 common/image.c Ramdisk header has bad magic number |
| -11 common/image.c Ramdisk header has bad checksum |
| 10 common/image.c Ramdisk header is OK |
| -12 common/image.c Ramdisk data has bad checksum |
| 11 common/image.c Ramdisk data has correct checksum |
| 12 common/image.c Ramdisk verification complete, start loading |
| -13 common/image.c Wrong Image Type (not PPC Linux ramdisk) |
| 13 common/image.c Start multifile image verification |
| 14 common/image.c No initial ramdisk, no multifile, continue. |
| |
| 15 arch/<arch>/lib/bootm.c All preparation done, transferring control to OS |
| |
| -30 arch/powerpc/lib/board.c Fatal error, hang the system |
| -31 post/post.c POST test failed, detected by post_output_backlog() |
| -32 post/post.c POST test failed, detected by post_run_single() |
| |
| 34 common/cmd_doc.c before loading a Image from a DOC device |
| -35 common/cmd_doc.c Bad usage of "doc" command |
| 35 common/cmd_doc.c correct usage of "doc" command |
| -36 common/cmd_doc.c No boot device |
| 36 common/cmd_doc.c correct boot device |
| -37 common/cmd_doc.c Unknown Chip ID on boot device |
| 37 common/cmd_doc.c correct chip ID found, device available |
| -38 common/cmd_doc.c Read Error on boot device |
| 38 common/cmd_doc.c reading Image header from DOC device OK |
| -39 common/cmd_doc.c Image header has bad magic number |
| 39 common/cmd_doc.c Image header has correct magic number |
| -40 common/cmd_doc.c Error reading Image from DOC device |
| 40 common/cmd_doc.c Image header has correct magic number |
| 41 common/cmd_ide.c before loading a Image from a IDE device |
| -42 common/cmd_ide.c Bad usage of "ide" command |
| 42 common/cmd_ide.c correct usage of "ide" command |
| -43 common/cmd_ide.c No boot device |
| 43 common/cmd_ide.c boot device found |
| -44 common/cmd_ide.c Device not available |
| 44 common/cmd_ide.c Device available |
| -45 common/cmd_ide.c wrong partition selected |
| 45 common/cmd_ide.c partition selected |
| -46 common/cmd_ide.c Unknown partition table |
| 46 common/cmd_ide.c valid partition table found |
| -47 common/cmd_ide.c Invalid partition type |
| 47 common/cmd_ide.c correct partition type |
| -48 common/cmd_ide.c Error reading Image Header on boot device |
| 48 common/cmd_ide.c reading Image Header from IDE device OK |
| -49 common/cmd_ide.c Image header has bad magic number |
| 49 common/cmd_ide.c Image header has correct magic number |
| -50 common/cmd_ide.c Image header has bad checksum |
| 50 common/cmd_ide.c Image header has correct checksum |
| -51 common/cmd_ide.c Error reading Image from IDE device |
| 51 common/cmd_ide.c reading Image from IDE device OK |
| 52 common/cmd_nand.c before loading a Image from a NAND device |
| -53 common/cmd_nand.c Bad usage of "nand" command |
| 53 common/cmd_nand.c correct usage of "nand" command |
| -54 common/cmd_nand.c No boot device |
| 54 common/cmd_nand.c boot device found |
| -55 common/cmd_nand.c Unknown Chip ID on boot device |
| 55 common/cmd_nand.c correct chip ID found, device available |
| -56 common/cmd_nand.c Error reading Image Header on boot device |
| 56 common/cmd_nand.c reading Image Header from NAND device OK |
| -57 common/cmd_nand.c Image header has bad magic number |
| 57 common/cmd_nand.c Image header has correct magic number |
| -58 common/cmd_nand.c Error reading Image from NAND device |
| 58 common/cmd_nand.c reading Image from NAND device OK |
| |
| -60 common/env_common.c Environment has a bad CRC, using default |
| |
| 64 net/eth.c starting with Ethernet configuration. |
| -64 net/eth.c no Ethernet found. |
| 65 net/eth.c Ethernet found. |
| |
| -80 common/cmd_net.c usage wrong |
| 80 common/cmd_net.c before calling net_loop() |
| -81 common/cmd_net.c some error in net_loop() occurred |
| 81 common/cmd_net.c net_loop() back without error |
| -82 common/cmd_net.c size == 0 (File with size 0 loaded) |
| 82 common/cmd_net.c trying automatic boot |
| 83 common/cmd_net.c running "source" command |
| -83 common/cmd_net.c some error in automatic boot or "source" command |
| 84 common/cmd_net.c end without errors |
| |
| FIT uImage format: |
| |
| Arg Where When |
| 100 common/cmd_bootm.c Kernel FIT Image has correct format |
| -100 common/cmd_bootm.c Kernel FIT Image has incorrect format |
| 101 common/cmd_bootm.c No Kernel subimage unit name, using configuration |
| -101 common/cmd_bootm.c Can't get configuration for kernel subimage |
| 102 common/cmd_bootm.c Kernel unit name specified |
| -103 common/cmd_bootm.c Can't get kernel subimage node offset |
| 103 common/cmd_bootm.c Found configuration node |
| 104 common/cmd_bootm.c Got kernel subimage node offset |
| -104 common/cmd_bootm.c Kernel subimage hash verification failed |
| 105 common/cmd_bootm.c Kernel subimage hash verification OK |
| -105 common/cmd_bootm.c Kernel subimage is for unsupported architecture |
| 106 common/cmd_bootm.c Architecture check OK |
| -106 common/cmd_bootm.c Kernel subimage has wrong type |
| 107 common/cmd_bootm.c Kernel subimage type OK |
| -107 common/cmd_bootm.c Can't get kernel subimage data/size |
| 108 common/cmd_bootm.c Got kernel subimage data/size |
| -108 common/cmd_bootm.c Wrong image type (not legacy, FIT) |
| -109 common/cmd_bootm.c Can't get kernel subimage type |
| -110 common/cmd_bootm.c Can't get kernel subimage comp |
| -111 common/cmd_bootm.c Can't get kernel subimage os |
| -112 common/cmd_bootm.c Can't get kernel subimage load address |
| -113 common/cmd_bootm.c Image uncompress/copy overwrite error |
| |
| 120 common/image.c Start initial ramdisk verification |
| -120 common/image.c Ramdisk FIT image has incorrect format |
| 121 common/image.c Ramdisk FIT image has correct format |
| 122 common/image.c No ramdisk subimage unit name, using configuration |
| -122 common/image.c Can't get configuration for ramdisk subimage |
| 123 common/image.c Ramdisk unit name specified |
| -124 common/image.c Can't get ramdisk subimage node offset |
| 125 common/image.c Got ramdisk subimage node offset |
| -125 common/image.c Ramdisk subimage hash verification failed |
| 126 common/image.c Ramdisk subimage hash verification OK |
| -126 common/image.c Ramdisk subimage for unsupported architecture |
| 127 common/image.c Architecture check OK |
| -127 common/image.c Can't get ramdisk subimage data/size |
| 128 common/image.c Got ramdisk subimage data/size |
| 129 common/image.c Can't get ramdisk load address |
| -129 common/image.c Got ramdisk load address |
| |
| -130 common/cmd_doc.c Incorrect FIT image format |
| 131 common/cmd_doc.c FIT image format OK |
| |
| -140 common/cmd_ide.c Incorrect FIT image format |
| 141 common/cmd_ide.c FIT image format OK |
| |
| -150 common/cmd_nand.c Incorrect FIT image format |
| 151 common/cmd_nand.c FIT image format OK |
| |
| - legacy image format: |
| CONFIG_IMAGE_FORMAT_LEGACY |
| enables the legacy image format support in U-Boot. |
| |
| Default: |
| enabled if CONFIG_FIT_SIGNATURE is not defined. |
| |
| CONFIG_DISABLE_IMAGE_LEGACY |
| disable the legacy image format |
| |
| This define is introduced, as the legacy image format is |
| enabled per default for backward compatibility. |
| |
| - Standalone program support: |
| CONFIG_STANDALONE_LOAD_ADDR |
| |
| This option defines a board specific value for the |
| address where standalone program gets loaded, thus |
| overwriting the architecture dependent default |
| settings. |
| |
| - Frame Buffer Address: |
| CONFIG_FB_ADDR |
| |
| Define CONFIG_FB_ADDR if you want to use specific |
| address for frame buffer. This is typically the case |
| when using a graphics controller has separate video |
| memory. U-Boot will then place the frame buffer at |
| the given address instead of dynamically reserving it |
| in system RAM by calling lcd_setmem(), which grabs |
| the memory for the frame buffer depending on the |
| configured panel size. |
| |
| Please see board_init_f function. |
| |
| - Automatic software updates via TFTP server |
| CONFIG_UPDATE_TFTP |
| CONFIG_UPDATE_TFTP_CNT_MAX |
| CONFIG_UPDATE_TFTP_MSEC_MAX |
| |
| These options enable and control the auto-update feature; |
| for a more detailed description refer to doc/README.update. |
| |
| - MTD Support (mtdparts command, UBI support) |
| CONFIG_MTD_DEVICE |
| |
| Adds the MTD device infrastructure from the Linux kernel. |
| Needed for mtdparts command support. |
| |
| CONFIG_MTD_PARTITIONS |
| |
| Adds the MTD partitioning infrastructure from the Linux |
| kernel. Needed for UBI support. |
| |
| - UBI support |
| CONFIG_UBI_SILENCE_MSG |
| |
| Make the verbose messages from UBI stop printing. This leaves |
| warnings and errors enabled. |
| |
| |
| CONFIG_MTD_UBI_WL_THRESHOLD |
| This parameter defines the maximum difference between the highest |
| erase counter value and the lowest erase counter value of eraseblocks |
| of UBI devices. When this threshold is exceeded, UBI starts performing |
| wear leveling by means of moving data from eraseblock with low erase |
| counter to eraseblocks with high erase counter. |
| |
| The default value should be OK for SLC NAND flashes, NOR flashes and |
| other flashes which have eraseblock life-cycle 100000 or more. |
| However, in case of MLC NAND flashes which typically have eraseblock |
| life-cycle less than 10000, the threshold should be lessened (e.g., |
| to 128 or 256, although it does not have to be power of 2). |
| |
| default: 4096 |
| |
| CONFIG_MTD_UBI_BEB_LIMIT |
| This option specifies the maximum bad physical eraseblocks UBI |
| expects on the MTD device (per 1024 eraseblocks). If the |
| underlying flash does not admit of bad eraseblocks (e.g. NOR |
| flash), this value is ignored. |
| |
| NAND datasheets often specify the minimum and maximum NVM |
| (Number of Valid Blocks) for the flashes' endurance lifetime. |
| The maximum expected bad eraseblocks per 1024 eraseblocks |
| then can be calculated as "1024 * (1 - MinNVB / MaxNVB)", |
| which gives 20 for most NANDs (MaxNVB is basically the total |
| count of eraseblocks on the chip). |
| |
| To put it differently, if this value is 20, UBI will try to |
| reserve about 1.9% of physical eraseblocks for bad blocks |
| handling. And that will be 1.9% of eraseblocks on the entire |
| NAND chip, not just the MTD partition UBI attaches. This means |
| that if you have, say, a NAND flash chip admits maximum 40 bad |
| eraseblocks, and it is split on two MTD partitions of the same |
| size, UBI will reserve 40 eraseblocks when attaching a |
| partition. |
| |
| default: 20 |
| |
| CONFIG_MTD_UBI_FASTMAP |
| Fastmap is a mechanism which allows attaching an UBI device |
| in nearly constant time. Instead of scanning the whole MTD device it |
| only has to locate a checkpoint (called fastmap) on the device. |
| The on-flash fastmap contains all information needed to attach |
| the device. Using fastmap makes only sense on large devices where |
| attaching by scanning takes long. UBI will not automatically install |
| a fastmap on old images, but you can set the UBI parameter |
| CONFIG_MTD_UBI_FASTMAP_AUTOCONVERT to 1 if you want so. Please note |
| that fastmap-enabled images are still usable with UBI implementations |
| without fastmap support. On typical flash devices the whole fastmap |
| fits into one PEB. UBI will reserve PEBs to hold two fastmaps. |
| |
| CONFIG_MTD_UBI_FASTMAP_AUTOCONVERT |
| Set this parameter to enable fastmap automatically on images |
| without a fastmap. |
| default: 0 |
| |
| CONFIG_MTD_UBI_FM_DEBUG |
| Enable UBI fastmap debug |
| default: 0 |
| |
| - UBIFS support |
| CONFIG_UBIFS_SILENCE_MSG |
| |
| Make the verbose messages from UBIFS stop printing. This leaves |
| warnings and errors enabled. |
| |
| - SPL framework |
| CONFIG_SPL |
| Enable building of SPL globally. |
| |
| CONFIG_SPL_LDSCRIPT |
| LDSCRIPT for linking the SPL binary. |
| |
| CONFIG_SPL_MAX_FOOTPRINT |
| Maximum size in memory allocated to the SPL, BSS included. |
| When defined, the linker checks that the actual memory |
| used by SPL from _start to __bss_end does not exceed it. |
| CONFIG_SPL_MAX_FOOTPRINT and CONFIG_SPL_BSS_MAX_SIZE |
| must not be both defined at the same time. |
| |
| CONFIG_SPL_MAX_SIZE |
| Maximum size of the SPL image (text, data, rodata, and |
| linker lists sections), BSS excluded. |
| When defined, the linker checks that the actual size does |
| not exceed it. |
| |
| CONFIG_SPL_TEXT_BASE |
| TEXT_BASE for linking the SPL binary. |
| |
| CONFIG_SPL_RELOC_TEXT_BASE |
| Address to relocate to. If unspecified, this is equal to |
| CONFIG_SPL_TEXT_BASE (i.e. no relocation is done). |
| |
| CONFIG_SPL_BSS_START_ADDR |
| Link address for the BSS within the SPL binary. |
| |
| CONFIG_SPL_BSS_MAX_SIZE |
| Maximum size in memory allocated to the SPL BSS. |
| When defined, the linker checks that the actual memory used |
| by SPL from __bss_start to __bss_end does not exceed it. |
| CONFIG_SPL_MAX_FOOTPRINT and CONFIG_SPL_BSS_MAX_SIZE |
| must not be both defined at the same time. |
| |
| CONFIG_SPL_STACK |
| Adress of the start of the stack SPL will use |
| |
| CONFIG_SPL_PANIC_ON_RAW_IMAGE |
| When defined, SPL will panic() if the image it has |
| loaded does not have a signature. |
| Defining this is useful when code which loads images |
| in SPL cannot guarantee that absolutely all read errors |
| will be caught. |
| An example is the LPC32XX MLC NAND driver, which will |
| consider that a completely unreadable NAND block is bad, |
| and thus should be skipped silently. |
| |
| CONFIG_SPL_RELOC_STACK |
| Adress of the start of the stack SPL will use after |
| relocation. If unspecified, this is equal to |
| CONFIG_SPL_STACK. |
| |
| CONFIG_SYS_SPL_MALLOC_START |
| Starting address of the malloc pool used in SPL. |
| When this option is set the full malloc is used in SPL and |
| it is set up by spl_init() and before that, the simple malloc() |
| can be used if CONFIG_SYS_MALLOC_F is defined. |
| |
| CONFIG_SYS_SPL_MALLOC_SIZE |
| The size of the malloc pool used in SPL. |
| |
| CONFIG_SPL_OS_BOOT |
| Enable booting directly to an OS from SPL. |
| See also: doc/README.falcon |
| |
| CONFIG_SPL_DISPLAY_PRINT |
| For ARM, enable an optional function to print more information |
| about the running system. |
| |
| CONFIG_SPL_INIT_MINIMAL |
| Arch init code should be built for a very small image |
| |
| CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_PARTITION |
| Partition on the MMC to load U-Boot from when the MMC is being |
| used in raw mode |
| |
| CONFIG_SYS_MMCSD_RAW_MODE_KERNEL_SECTOR |
| Sector to load kernel uImage from when MMC is being |
| used in raw mode (for Falcon mode) |
| |
| CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTOR, |
| CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTORS |
| Sector and number of sectors to load kernel argument |
| parameters from when MMC is being used in raw mode |
| (for falcon mode) |
| |
| CONFIG_SYS_MMCSD_FS_BOOT_PARTITION |
| Partition on the MMC to load U-Boot from when the MMC is being |
| used in fs mode |
| |
| CONFIG_SPL_FS_LOAD_PAYLOAD_NAME |
| Filename to read to load U-Boot when reading from filesystem |
| |
| CONFIG_SPL_FS_LOAD_KERNEL_NAME |
| Filename to read to load kernel uImage when reading |
| from filesystem (for Falcon mode) |
| |
| CONFIG_SPL_FS_LOAD_ARGS_NAME |
| Filename to read to load kernel argument parameters |
| when reading from filesystem (for Falcon mode) |
| |
| CONFIG_SPL_MPC83XX_WAIT_FOR_NAND |
| Set this for NAND SPL on PPC mpc83xx targets, so that |
| start.S waits for the rest of the SPL to load before |
| continuing (the hardware starts execution after just |
| loading the first page rather than the full 4K). |
| |
| CONFIG_SPL_SKIP_RELOCATE |
| Avoid SPL relocation |
| |
| CONFIG_SPL_NAND_BASE |
| Include nand_base.c in the SPL. Requires |
| CONFIG_SPL_NAND_DRIVERS. |
| |
| CONFIG_SPL_NAND_DRIVERS |
| SPL uses normal NAND drivers, not minimal drivers. |
| |
| CONFIG_SPL_NAND_ECC |
| Include standard software ECC in the SPL |
| |
| CONFIG_SPL_NAND_SIMPLE |
| Support for NAND boot using simple NAND drivers that |
| expose the cmd_ctrl() interface. |
| |
| CONFIG_SPL_UBI |
| Support for a lightweight UBI (fastmap) scanner and |
| loader |
| |
| CONFIG_SPL_NAND_RAW_ONLY |
| Support to boot only raw u-boot.bin images. Use this only |
| if you need to save space. |
| |
| CONFIG_SPL_COMMON_INIT_DDR |
| Set for common ddr init with serial presence detect in |
| SPL binary. |
| |
| CONFIG_SYS_NAND_5_ADDR_CYCLE, CONFIG_SYS_NAND_PAGE_COUNT, |
| CONFIG_SYS_NAND_PAGE_SIZE, CONFIG_SYS_NAND_OOBSIZE, |
| CONFIG_SYS_NAND_BLOCK_SIZE, CONFIG_SYS_NAND_BAD_BLOCK_POS, |
| CONFIG_SYS_NAND_ECCPOS, CONFIG_SYS_NAND_ECCSIZE, |
| CONFIG_SYS_NAND_ECCBYTES |
| Defines the size and behavior of the NAND that SPL uses |
| to read U-Boot |
| |
| CONFIG_SPL_NAND_BOOT |
| Add support NAND boot |
| |
| CONFIG_SYS_NAND_U_BOOT_OFFS |
| Location in NAND to read U-Boot from |
| |
| CONFIG_SYS_NAND_U_BOOT_DST |
| Location in memory to load U-Boot to |
| |
| CONFIG_SYS_NAND_U_BOOT_SIZE |
| Size of image to load |
| |
| CONFIG_SYS_NAND_U_BOOT_START |
| Entry point in loaded image to jump to |
| |
| CONFIG_SYS_NAND_HW_ECC_OOBFIRST |
| Define this if you need to first read the OOB and then the |
| data. This is used, for example, on davinci platforms. |
| |
| CONFIG_SPL_RAM_DEVICE |
| Support for running image already present in ram, in SPL binary |
| |
| CONFIG_SPL_PAD_TO |
| Image offset to which the SPL should be padded before appending |
| the SPL payload. By default, this is defined as |
| CONFIG_SPL_MAX_SIZE, or 0 if CONFIG_SPL_MAX_SIZE is undefined. |
| CONFIG_SPL_PAD_TO must be either 0, meaning to append the SPL |
| payload without any padding, or >= CONFIG_SPL_MAX_SIZE. |
| |
| CONFIG_SPL_TARGET |
| Final target image containing SPL and payload. Some SPLs |
| use an arch-specific makefile fragment instead, for |
| example if more than one image needs to be produced. |
| |
| CONFIG_FIT_SPL_PRINT |
| Printing information about a FIT image adds quite a bit of |
| code to SPL. So this is normally disabled in SPL. Use this |
| option to re-enable it. This will affect the output of the |
| bootm command when booting a FIT image. |
| |
| - TPL framework |
| CONFIG_TPL |
| Enable building of TPL globally. |
| |
| CONFIG_TPL_PAD_TO |
| Image offset to which the TPL should be padded before appending |
| the TPL payload. By default, this is defined as |
| CONFIG_SPL_MAX_SIZE, or 0 if CONFIG_SPL_MAX_SIZE is undefined. |
| CONFIG_SPL_PAD_TO must be either 0, meaning to append the SPL |
| payload without any padding, or >= CONFIG_SPL_MAX_SIZE. |
| |
| - Interrupt support (PPC): |
| |
| There are common interrupt_init() and timer_interrupt() |
| for all PPC archs. interrupt_init() calls interrupt_init_cpu() |
| for CPU specific initialization. interrupt_init_cpu() |
| should set decrementer_count to appropriate value. If |
| CPU resets decrementer automatically after interrupt |
| (ppc4xx) it should set decrementer_count to zero. |
| timer_interrupt() calls timer_interrupt_cpu() for CPU |
| specific handling. If board has watchdog / status_led |
| / other_activity_monitor it works automatically from |
| general timer_interrupt(). |
| |
| |
| Board initialization settings: |
| ------------------------------ |
| |
| During Initialization u-boot calls a number of board specific functions |
| to allow the preparation of board specific prerequisites, e.g. pin setup |
| before drivers are initialized. To enable these callbacks the |
| following configuration macros have to be defined. Currently this is |
| architecture specific, so please check arch/your_architecture/lib/board.c |
| typically in board_init_f() and board_init_r(). |
| |
| - CONFIG_BOARD_EARLY_INIT_F: Call board_early_init_f() |
| - CONFIG_BOARD_EARLY_INIT_R: Call board_early_init_r() |
| - CONFIG_BOARD_LATE_INIT: Call board_late_init() |
| - CONFIG_BOARD_POSTCLK_INIT: Call board_postclk_init() |
| |
| Configuration Settings: |
| ----------------------- |
| |
| - CONFIG_SYS_SUPPORT_64BIT_DATA: Defined automatically if compiled as 64-bit. |
| Optionally it can be defined to support 64-bit memory commands. |
| |
| - CONFIG_SYS_LONGHELP: Defined when you want long help messages included; |
| undefine this when you're short of memory. |
| |
| - CONFIG_SYS_HELP_CMD_WIDTH: Defined when you want to override the default |
| width of the commands listed in the 'help' command output. |
| |
| - CONFIG_SYS_PROMPT: This is what U-Boot prints on the console to |
| prompt for user input. |
| |
| - CONFIG_SYS_CBSIZE: Buffer size for input from the Console |
| |
| - CONFIG_SYS_PBSIZE: Buffer size for Console output |
| |
| - CONFIG_SYS_MAXARGS: max. Number of arguments accepted for monitor commands |
| |
| - CONFIG_SYS_BARGSIZE: Buffer size for Boot Arguments which are passed to |
| the application (usually a Linux kernel) when it is |
| booted |
| |
| - CONFIG_SYS_BAUDRATE_TABLE: |
| List of legal baudrate settings for this board. |
| |
| - CONFIG_SYS_MEMTEST_START, CONFIG_SYS_MEMTEST_END: |
| Begin and End addresses of the area used by the |
| simple memory test. |
| |
| - CONFIG_SYS_ALT_MEMTEST: |
| Enable an alternate, more extensive memory test. |
| |
| - CONFIG_SYS_MEMTEST_SCRATCH: |
| Scratch address used by the alternate memory test |
| You only need to set this if address zero isn't writeable |
| |
| - CONFIG_SYS_MEM_RESERVE_SECURE |
| Only implemented for ARMv8 for now. |
| If defined, the size of CONFIG_SYS_MEM_RESERVE_SECURE memory |
| is substracted from total RAM and won't be reported to OS. |
| This memory can be used as secure memory. A variable |
| gd->arch.secure_ram is used to track the location. In systems |
| the RAM base is not zero, or RAM is divided into banks, |
| this variable needs to be recalcuated to get the address. |
| |
| - CONFIG_SYS_MEM_TOP_HIDE: |
| If CONFIG_SYS_MEM_TOP_HIDE is defined in the board config header, |
| this specified memory area will get subtracted from the top |
| (end) of RAM and won't get "touched" at all by U-Boot. By |
| fixing up gd->ram_size the Linux kernel should gets passed |
| the now "corrected" memory size and won't touch it either. |
| This should work for arch/ppc and arch/powerpc. Only Linux |
| board ports in arch/powerpc with bootwrapper support that |
| recalculate the memory size from the SDRAM controller setup |
| will have to get fixed in Linux additionally. |
| |
| This option can be used as a workaround for the 440EPx/GRx |
| CHIP 11 errata where the last 256 bytes in SDRAM shouldn't |
| be touched. |
| |
| WARNING: Please make sure that this value is a multiple of |
| the Linux page size (normally 4k). If this is not the case, |
| then the end address of the Linux memory will be located at a |
| non page size aligned address and this could cause major |
| problems. |
| |
| - CONFIG_SYS_LOADS_BAUD_CHANGE: |
| Enable temporary baudrate change while serial download |
| |
| - CONFIG_SYS_SDRAM_BASE: |
| Physical start address of SDRAM. _Must_ be 0 here. |
| |
| - CONFIG_SYS_FLASH_BASE: |
| Physical start address of Flash memory. |
| |
| - CONFIG_SYS_MONITOR_BASE: |
| Physical start address of boot monitor code (set by |
| make config files to be same as the text base address |
| (CONFIG_SYS_TEXT_BASE) used when linking) - same as |
| CONFIG_SYS_FLASH_BASE when booting from flash. |
| |
| - CONFIG_SYS_MONITOR_LEN: |
| Size of memory reserved for monitor code, used to |
| determine _at_compile_time_ (!) if the environment is |
| embedded within the U-Boot image, or in a separate |
| flash sector. |
| |
| - CONFIG_SYS_MALLOC_LEN: |
| Size of DRAM reserved for malloc() use. |
| |
| - CONFIG_SYS_MALLOC_F_LEN |
| Size of the malloc() pool for use before relocation. If |
| this is defined, then a very simple malloc() implementation |
| will become available before relocation. The address is just |
| below the global data, and the stack is moved down to make |
| space. |
| |
| This feature allocates regions with increasing addresses |
| within the region. calloc() is supported, but realloc() |
| is not available. free() is supported but does nothing. |
| The memory will be freed (or in fact just forgotten) when |
| U-Boot relocates itself. |
| |
| - CONFIG_SYS_MALLOC_SIMPLE |
| Provides a simple and small malloc() and calloc() for those |
| boards which do not use the full malloc in SPL (which is |
| enabled with CONFIG_SYS_SPL_MALLOC_START). |
| |
| - CONFIG_SYS_NONCACHED_MEMORY: |
| Size of non-cached memory area. This area of memory will be |
| typically located right below the malloc() area and mapped |
| uncached in the MMU. This is useful for drivers that would |
| otherwise require a lot of explicit cache maintenance. For |
| some drivers it's also impossible to properly maintain the |
| cache. For example if the regions that need to be flushed |
| are not a multiple of the cache-line size, *and* padding |
| cannot be allocated between the regions to align them (i.e. |
| if the HW requires a contiguous array of regions, and the |
| size of each region is not cache-aligned), then a flush of |
| one region may result in overwriting data that hardware has |
| written to another region in the same cache-line. This can |
| happen for example in network drivers where descriptors for |
| buffers are typically smaller than the CPU cache-line (e.g. |
| 16 bytes vs. 32 or 64 bytes). |
| |
| Non-cached memory is only supported on 32-bit ARM at present. |
| |
| - CONFIG_SYS_BOOTM_LEN: |
| Normally compressed uImages are limited to an |
| uncompressed size of 8 MBytes. If this is not enough, |
| you can define CONFIG_SYS_BOOTM_LEN in your board config file |
| to adjust this setting to your needs. |
| |
| - CONFIG_SYS_BOOTMAPSZ: |
| Maximum size of memory mapped by the startup code of |
| the Linux kernel; all data that must be processed by |
| the Linux kernel (bd_info, boot arguments, FDT blob if |
| used) must be put below this limit, unless "bootm_low" |
| environment variable is defined and non-zero. In such case |
| all data for the Linux kernel must be between "bootm_low" |
| and "bootm_low" + CONFIG_SYS_BOOTMAPSZ. The environment |
| variable "bootm_mapsize" will override the value of |
| CONFIG_SYS_BOOTMAPSZ. If CONFIG_SYS_BOOTMAPSZ is undefined, |
| then the value in "bootm_size" will be used instead. |
| |
| - CONFIG_SYS_BOOT_RAMDISK_HIGH: |
| Enable initrd_high functionality. If defined then the |
| initrd_high feature is enabled and the bootm ramdisk subcommand |
| is enabled. |
| |
| - CONFIG_SYS_BOOT_GET_CMDLINE: |
| Enables allocating and saving kernel cmdline in space between |
| "bootm_low" and "bootm_low" + BOOTMAPSZ. |
| |
| - CONFIG_SYS_BOOT_GET_KBD: |
| Enables allocating and saving a kernel copy of the bd_info in |
| space between "bootm_low" and "bootm_low" + BOOTMAPSZ. |
| |
| - CONFIG_SYS_MAX_FLASH_BANKS: |
| Max number of Flash memory banks |
| |
| - CONFIG_SYS_MAX_FLASH_SECT: |
| Max number of sectors on a Flash chip |
| |
| - CONFIG_SYS_FLASH_ERASE_TOUT: |
| Timeout for Flash erase operations (in ms) |
| |
| - CONFIG_SYS_FLASH_WRITE_TOUT: |
| Timeout for Flash write operations (in ms) |
| |
| - CONFIG_SYS_FLASH_LOCK_TOUT |
| Timeout for Flash set sector lock bit operation (in ms) |
| |
| - CONFIG_SYS_FLASH_UNLOCK_TOUT |
| Timeout for Flash clear lock bits operation (in ms) |
| |
| - CONFIG_SYS_FLASH_PROTECTION |
| If defined, hardware flash sectors protection is used |
| instead of U-Boot software protection. |
| |
| - CONFIG_SYS_DIRECT_FLASH_TFTP: |
| |
| Enable TFTP transfers directly to flash memory; |
| without this option such a download has to be |
| performed in two steps: (1) download to RAM, and (2) |
| copy from RAM to flash. |
| |
| The two-step approach is usually more reliable, since |
| you can check if the download worked before you erase |
| the flash, but in some situations (when system RAM is |
| too limited to allow for a temporary copy of the |
| downloaded image) this option may be very useful. |
| |
| - CONFIG_SYS_FLASH_CFI: |
| Define if the flash driver uses extra elements in the |
| common flash structure for storing flash geometry. |
| |
| - CONFIG_FLASH_CFI_DRIVER |
| This option also enables the building of the cfi_flash driver |
| in the drivers directory |
| |
| - CONFIG_FLASH_CFI_MTD |
| This option enables the building of the cfi_mtd driver |
| in the drivers directory. The driver exports CFI flash |
| to the MTD layer. |
| |
| - CONFIG_SYS_FLASH_USE_BUFFER_WRITE |
| Use buffered writes to flash. |
| |
| - CONFIG_FLASH_SPANSION_S29WS_N |
| s29ws-n MirrorBit flash has non-standard addresses for buffered |
| write commands. |
| |
| - CONFIG_SYS_FLASH_QUIET_TEST |
| If this option is defined, the common CFI flash doesn't |
| print it's warning upon not recognized FLASH banks. This |
| is useful, if some of the configured banks are only |
| optionally available. |
| |
| - CONFIG_FLASH_SHOW_PROGRESS |
| If defined (must be an integer), print out countdown |
| digits and dots. Recommended value: 45 (9..1) for 80 |
| column displays, 15 (3..1) for 40 column displays. |
| |
| - CONFIG_FLASH_VERIFY |
| If defined, the content of the flash (destination) is compared |
| against the source after the write operation. An error message |
| will be printed when the contents are not identical. |
| Please note that this option is useless in nearly all cases, |
| since such flash programming errors usually are detected earlier |
| while unprotecting/erasing/programming. Please only enable |
| this option if you really know what you are doing. |
| |
| - CONFIG_SYS_RX_ETH_BUFFER: |
| Defines the number of Ethernet receive buffers. On some |
| Ethernet controllers it is recommended to set this value |
| to 8 or even higher (EEPRO100 or 405 EMAC), since all |
| buffers can be full shortly after enabling the interface |
| on high Ethernet traffic. |
| Defaults to 4 if not defined. |
| |
| - CONFIG_ENV_MAX_ENTRIES |
| |
| Maximum number of entries in the hash table that is used |
| internally to store the environment settings. The default |
| setting is supposed to be generous and should work in most |
| cases. This setting can be used to tune behaviour; see |
| lib/hashtable.c for details. |
| |
| - CONFIG_ENV_FLAGS_LIST_DEFAULT |
| - CONFIG_ENV_FLAGS_LIST_STATIC |
| Enable validation of the values given to environment variables when |
| calling env set. Variables can be restricted to only decimal, |
| hexadecimal, or boolean. If CONFIG_CMD_NET is also defined, |
| the variables can also be restricted to IP address or MAC address. |
| |
| The format of the list is: |
| type_attribute = [s|d|x|b|i|m] |
| access_attribute = [a|r|o|c] |
| attributes = type_attribute[access_attribute] |
| entry = variable_name[:attributes] |
| list = entry[,list] |
| |
| The type attributes are: |
| s - String (default) |
| d - Decimal |
| x - Hexadecimal |
| b - Boolean ([1yYtT|0nNfF]) |
| i - IP address |
| m - MAC address |
| |
| The access attributes are: |
| a - Any (default) |
| r - Read-only |
| o - Write-once |
| c - Change-default |
| |
| - CONFIG_ENV_FLAGS_LIST_DEFAULT |
| Define this to a list (string) to define the ".flags" |
| environment variable in the default or embedded environment. |
| |
| - CONFIG_ENV_FLAGS_LIST_STATIC |
| Define this to a list (string) to define validation that |
| should be done if an entry is not found in the ".flags" |
| environment variable. To override a setting in the static |
| list, simply add an entry for the same variable name to the |
| ".flags" variable. |
| |
| If CONFIG_REGEX is defined, the variable_name above is evaluated as a |
| regular expression. This allows multiple variables to define the same |
| flags without explicitly listing them for each variable. |
| |
| - CONFIG_ENV_ACCESS_IGNORE_FORCE |
| If defined, don't allow the -f switch to env set override variable |
| access flags. |
| |
| - CONFIG_USE_STDINT |
| If stdint.h is available with your toolchain you can define this |
| option to enable it. You can provide option 'USE_STDINT=1' when |
| building U-Boot to enable this. |
| |
| The following definitions that deal with the placement and management |
| of environment data (variable area); in general, we support the |
| following configurations: |
| |
| - CONFIG_BUILD_ENVCRC: |
| |
| Builds up envcrc with the target environment so that external utils |
| may easily extract it and embed it in final U-Boot images. |
| |
| BE CAREFUL! The first access to the environment happens quite early |
| in U-Boot initialization (when we try to get the setting of for the |
| console baudrate). You *MUST* have mapped your NVRAM area then, or |
| U-Boot will hang. |
| |
| Please note that even with NVRAM we still use a copy of the |
| environment in RAM: we could work on NVRAM directly, but we want to |
| keep settings there always unmodified except somebody uses "saveenv" |
| to save the current settings. |
| |
| BE CAREFUL! For some special cases, the local device can not use |
| "saveenv" command. For example, the local device will get the |
| environment stored in a remote NOR flash by SRIO or PCIE link, |
| but it can not erase, write this NOR flash by SRIO or PCIE interface. |
| |
| - CONFIG_NAND_ENV_DST |
| |
| Defines address in RAM to which the nand_spl code should copy the |
| environment. If redundant environment is used, it will be copied to |
| CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE. |
| |
| Please note that the environment is read-only until the monitor |
| has been relocated to RAM and a RAM copy of the environment has been |
| created; also, when using EEPROM you will have to use env_get_f() |
| until then to read environment variables. |
| |
| The environment is protected by a CRC32 checksum. Before the monitor |
| is relocated into RAM, as a result of a bad CRC you will be working |
| with the compiled-in default environment - *silently*!!! [This is |
| necessary, because the first environment variable we need is the |
| "baudrate" setting for the console - if we have a bad CRC, we don't |
| have any device yet where we could complain.] |
| |
| Note: once the monitor has been relocated, then it will complain if |
| the default environment is used; a new CRC is computed as soon as you |
| use the "saveenv" command to store a valid environment. |
| |
| - CONFIG_SYS_FAULT_ECHO_LINK_DOWN: |
| Echo the inverted Ethernet link state to the fault LED. |
| |
| Note: If this option is active, then CONFIG_SYS_FAULT_MII_ADDR |
| also needs to be defined. |
| |
| - CONFIG_SYS_FAULT_MII_ADDR: |
| MII address of the PHY to check for the Ethernet link state. |
| |
| - CONFIG_NS16550_MIN_FUNCTIONS: |
| Define this if you desire to only have use of the NS16550_init |
| and NS16550_putc functions for the serial driver located at |
| drivers/serial/ns16550.c. This option is useful for saving |
| space for already greatly restricted images, including but not |
| limited to NAND_SPL configurations. |
| |
| - CONFIG_DISPLAY_BOARDINFO |
| Display information about the board that U-Boot is running on |
| when U-Boot starts up. The board function checkboard() is called |
| to do this. |
| |
| - CONFIG_DISPLAY_BOARDINFO_LATE |
| Similar to the previous option, but display this information |
| later, once stdio is running and output goes to the LCD, if |
| present. |
| |
| - CONFIG_BOARD_SIZE_LIMIT: |
| Maximum size of the U-Boot image. When defined, the |
| build system checks that the actual size does not |
| exceed it. |
| |
| Low Level (hardware related) configuration options: |
| --------------------------------------------------- |
| |
| - CONFIG_SYS_CACHELINE_SIZE: |
| Cache Line Size of the CPU. |
| |
| - CONFIG_SYS_CCSRBAR_DEFAULT: |
| Default (power-on reset) physical address of CCSR on Freescale |
| PowerPC SOCs. |
| |
| - CONFIG_SYS_CCSRBAR: |
| Virtual address of CCSR. On a 32-bit build, this is typically |
| the same value as CONFIG_SYS_CCSRBAR_DEFAULT. |
| |
| - CONFIG_SYS_CCSRBAR_PHYS: |
| Physical address of CCSR. CCSR can be relocated to a new |
| physical address, if desired. In this case, this macro should |
| be set to that address. Otherwise, it should be set to the |
| same value as CONFIG_SYS_CCSRBAR_DEFAULT. For example, CCSR |
| is typically relocated on 36-bit builds. It is recommended |
| that this macro be defined via the _HIGH and _LOW macros: |
| |
| #define CONFIG_SYS_CCSRBAR_PHYS ((CONFIG_SYS_CCSRBAR_PHYS_HIGH |
| * 1ull) << 32 | CONFIG_SYS_CCSRBAR_PHYS_LOW) |
| |
| - CONFIG_SYS_CCSRBAR_PHYS_HIGH: |
| Bits 33-36 of CONFIG_SYS_CCSRBAR_PHYS. This value is typically |
| either 0 (32-bit build) or 0xF (36-bit build). This macro is |
| used in assembly code, so it must not contain typecasts or |
| integer size suffixes (e.g. "ULL"). |
| |
| - CONFIG_SYS_CCSRBAR_PHYS_LOW: |
| Lower 32-bits of CONFIG_SYS_CCSRBAR_PHYS. This macro is |
| used in assembly code, so it must not contain typecasts or |
| integer size suffixes (e.g. "ULL"). |
| |
| - CONFIG_SYS_CCSR_DO_NOT_RELOCATE: |
| If this macro is defined, then CONFIG_SYS_CCSRBAR_PHYS will be |
| forced to a value that ensures that CCSR is not relocated. |
| |
| - Floppy Disk Support: |
| CONFIG_SYS_FDC_DRIVE_NUMBER |
| |
| the default drive number (default value 0) |
| |
| CONFIG_SYS_ISA_IO_STRIDE |
| |
| defines the spacing between FDC chipset registers |
| (default value 1) |
| |
| CONFIG_SYS_ISA_IO_OFFSET |
| |
| defines the offset of register from address. It |
| depends on which part of the data bus is connected to |
| the FDC chipset. (default value 0) |
| |
| If CONFIG_SYS_ISA_IO_STRIDE CONFIG_SYS_ISA_IO_OFFSET and |
| CONFIG_SYS_FDC_DRIVE_NUMBER are undefined, they take their |
| default value. |
| |
| if CONFIG_SYS_FDC_HW_INIT is defined, then the function |
| fdc_hw_init() is called at the beginning of the FDC |
| setup. fdc_hw_init() must be provided by the board |
| source code. It is used to make hardware-dependent |
| initializations. |
| |
| - CONFIG_IDE_AHB: |
| Most IDE controllers were designed to be connected with PCI |
| interface. Only few of them were designed for AHB interface. |
| When software is doing ATA command and data transfer to |
| IDE devices through IDE-AHB controller, some additional |
| registers accessing to these kind of IDE-AHB controller |
| is required. |
| |
| - CONFIG_SYS_IMMR: Physical address of the Internal Memory. |
| DO NOT CHANGE unless you know exactly what you're |
| doing! (11-4) [MPC8xx systems only] |
| |
| - CONFIG_SYS_INIT_RAM_ADDR: |
| |
| Start address of memory area that can be used for |
| initial data and stack; please note that this must be |
| writable memory that is working WITHOUT special |
| initialization, i. e. you CANNOT use normal RAM which |
| will become available only after programming the |
| memory controller and running certain initialization |
| sequences. |
| |
| U-Boot uses the following memory types: |
| - MPC8xx: IMMR (internal memory of the CPU) |
| |
| - CONFIG_SYS_GBL_DATA_OFFSET: |
| |
| Offset of the initial data structure in the memory |
| area defined by CONFIG_SYS_INIT_RAM_ADDR. Usually |
| CONFIG_SYS_GBL_DATA_OFFSET is chosen such that the initial |
| data is located at the end of the available space |
| (sometimes written as (CONFIG_SYS_INIT_RAM_SIZE - |
| GENERATED_GBL_DATA_SIZE), and the initial stack is just |
| below that area (growing from (CONFIG_SYS_INIT_RAM_ADDR + |
| CONFIG_SYS_GBL_DATA_OFFSET) downward. |
| |
| Note: |
| On the MPC824X (or other systems that use the data |
| cache for initial memory) the address chosen for |
| CONFIG_SYS_INIT_RAM_ADDR is basically arbitrary - it must |
| point to an otherwise UNUSED address space between |
| the top of RAM and the start of the PCI space. |
| |
| - CONFIG_SYS_SCCR: System Clock and reset Control Register (15-27) |
| |
| - CONFIG_SYS_OR_TIMING_SDRAM: |
| SDRAM timing |
| |
| - CONFIG_SYS_MAMR_PTA: |
| periodic timer for refresh |
| |
| - FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CONFIG_SYS_REMAP_OR_AM, |
| CONFIG_SYS_PRELIM_OR_AM, CONFIG_SYS_OR_TIMING_FLASH, CONFIG_SYS_OR0_REMAP, |
| CONFIG_SYS_OR0_PRELIM, CONFIG_SYS_BR0_PRELIM, CONFIG_SYS_OR1_REMAP, CONFIG_SYS_OR1_PRELIM, |
| CONFIG_SYS_BR1_PRELIM: |
| Memory Controller Definitions: BR0/1 and OR0/1 (FLASH) |
| |
| - SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE, |
| CONFIG_SYS_OR_TIMING_SDRAM, CONFIG_SYS_OR2_PRELIM, CONFIG_SYS_BR2_PRELIM, |
| CONFIG_SYS_OR3_PRELIM, CONFIG_SYS_BR3_PRELIM: |
| Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM) |
| |
| - CONFIG_PCI_ENUM_ONLY |
| Only scan through and get the devices on the buses. |
| Don't do any setup work, presumably because someone or |
| something has already done it, and we don't need to do it |
| a second time. Useful for platforms that are pre-booted |
| by coreboot or similar. |
| |
| - CONFIG_PCI_INDIRECT_BRIDGE: |
| Enable support for indirect PCI bridges. |
| |
| - CONFIG_SYS_SRIO: |
| Chip has SRIO or not |
| |
| - CONFIG_SRIO1: |
| Board has SRIO 1 port available |
| |
| - CONFIG_SRIO2: |
| Board has SRIO 2 port available |
| |
| - CONFIG_SRIO_PCIE_BOOT_MASTER |
| Board can support master function for Boot from SRIO and PCIE |
| |
| - CONFIG_SYS_SRIOn_MEM_VIRT: |
| Virtual Address of SRIO port 'n' memory region |
| |
| - CONFIG_SYS_SRIOn_MEM_PHYS: |
| Physical Address of SRIO port 'n' memory region |
| |
| - CONFIG_SYS_SRIOn_MEM_SIZE: |
| Size of SRIO port 'n' memory region |
| |
| - CONFIG_SYS_NAND_BUSWIDTH_16BIT |
| Defined to tell the NAND controller that the NAND chip is using |
| a 16 bit bus. |
| Not all NAND drivers use this symbol. |
| Example of drivers that use it: |
| - drivers/mtd/nand/ndfc.c |
| - drivers/mtd/nand/mxc_nand.c |
| |
| - CONFIG_SYS_NDFC_EBC0_CFG |
| Sets the EBC0_CFG register for the NDFC. If not defined |
| a default value will be used. |
| |
| - CONFIG_SPD_EEPROM |
| Get DDR timing information from an I2C EEPROM. Common |
| with pluggable memory modules such as SODIMMs |
| |
| SPD_EEPROM_ADDRESS |
| I2C address of the SPD EEPROM |
| |
| - CONFIG_SYS_SPD_BUS_NUM |
| If SPD EEPROM is on an I2C bus other than the first |
| one, specify here. Note that the value must resolve |
| to something your driver can deal with. |
| |
| - CONFIG_SYS_DDR_RAW_TIMING |
| Get DDR timing information from other than SPD. Common with |
| soldered DDR chips onboard without SPD. DDR raw timing |
| parameters are extracted from datasheet and hard-coded into |
| header files or board specific files. |
| |
| - CONFIG_FSL_DDR_INTERACTIVE |
| Enable interactive DDR debugging. See doc/README.fsl-ddr. |
| |
| - CONFIG_FSL_DDR_SYNC_REFRESH |
| Enable sync of refresh for multiple controllers. |
| |
| - CONFIG_FSL_DDR_BIST |
| Enable built-in memory test for Freescale DDR controllers. |
| |
| - CONFIG_SYS_83XX_DDR_USES_CS0 |
| Only for 83xx systems. If specified, then DDR should |
| be configured using CS0 and CS1 instead of CS2 and CS3. |
| |
| - CONFIG_RMII |
| Enable RMII mode for all FECs. |
| Note that this is a global option, we can't |
| have one FEC in standard MII mode and another in RMII mode. |
| |
| - CONFIG_CRC32_VERIFY |
| Add a verify option to the crc32 command. |
| The syntax is: |
| |
| => crc32 -v <address> <count> <crc32> |
| |
| Where address/count indicate a memory area |
| and crc32 is the correct crc32 which the |
| area should have. |
| |
| - CONFIG_LOOPW |
| Add the "loopw" memory command. This only takes effect if |
| the memory commands are activated globally (CONFIG_CMD_MEMORY). |
| |
| - CONFIG_MX_CYCLIC |
| Add the "mdc" and "mwc" memory commands. These are cyclic |
| "md/mw" commands. |
| Examples: |
| |
| => mdc.b 10 4 500 |
| This command will print 4 bytes (10,11,12,13) each 500 ms. |
| |
| => mwc.l 100 12345678 10 |
| This command will write 12345678 to address 100 all 10 ms. |
| |
| This only takes effect if the memory commands are activated |
| globally (CONFIG_CMD_MEMORY). |
| |
| - CONFIG_SKIP_LOWLEVEL_INIT |
| [ARM, NDS32, MIPS, RISC-V only] If this variable is defined, then certain |
| low level initializations (like setting up the memory |
| controller) are omitted and/or U-Boot does not |
| relocate itself into RAM. |
| |
| Normally this variable MUST NOT be defined. The only |
| exception is when U-Boot is loaded (to RAM) by some |
| other boot loader or by a debugger which performs |
| these initializations itself. |
| |
| - CONFIG_SKIP_LOWLEVEL_INIT_ONLY |
| [ARM926EJ-S only] This allows just the call to lowlevel_init() |
| to be skipped. The normal CP15 init (such as enabling the |
| instruction cache) is still performed. |
| |
| - CONFIG_SPL_BUILD |
| Modifies the behaviour of start.S when compiling a loader |
| that is executed before the actual U-Boot. E.g. when |
| compiling a NAND SPL. |
| |
| - CONFIG_TPL_BUILD |
| Modifies the behaviour of start.S when compiling a loader |
| that is executed after the SPL and before the actual U-Boot. |
| It is loaded by the SPL. |
| |
| - CONFIG_SYS_MPC85XX_NO_RESETVEC |
| Only for 85xx systems. If this variable is specified, the section |
| .resetvec is not kept and the section .bootpg is placed in the |
| previous 4k of the .text section. |
| |
| - CONFIG_ARCH_MAP_SYSMEM |
| Generally U-Boot (and in particular the md command) uses |
| effective address. It is therefore not necessary to regard |
| U-Boot address as virtual addresses that need to be translated |
| to physical addresses. However, sandbox requires this, since |
| it maintains its own little RAM buffer which contains all |
| addressable memory. This option causes some memory accesses |
| to be mapped through map_sysmem() / unmap_sysmem(). |
| |
| - CONFIG_X86_RESET_VECTOR |
| If defined, the x86 reset vector code is included. This is not |
| needed when U-Boot is running from Coreboot. |
| |
| - CONFIG_SPL_AM33XX_ENABLE_RTC32K_OSC: |
| Enables the RTC32K OSC on AM33xx based plattforms |
| |
| - CONFIG_SYS_NAND_NO_SUBPAGE_WRITE |
| Option to disable subpage write in NAND driver |
| driver that uses this: |
| drivers/mtd/nand/davinci_nand.c |
| |
| Freescale QE/FMAN Firmware Support: |
| ----------------------------------- |
| |
| The Freescale QUICCEngine (QE) and Frame Manager (FMAN) both support the |
| loading of "firmware", which is encoded in the QE firmware binary format. |
| This firmware often needs to be loaded during U-Boot booting, so macros |
| are used to identify the storage device (NOR flash, SPI, etc) and the address |
| within that device. |
| |
| - CONFIG_SYS_FMAN_FW_ADDR |
| The address in the storage device where the FMAN microcode is located. The |
| meaning of this address depends on which CONFIG_SYS_QE_FW_IN_xxx macro |
| is also specified. |
| |
| - CONFIG_SYS_QE_FW_ADDR |
| The address in the storage device where the QE microcode is located. The |
| meaning of this address depends on which CONFIG_SYS_QE_FW_IN_xxx macro |
| is also specified. |
| |
| - CONFIG_SYS_QE_FMAN_FW_LENGTH |
| The maximum possible size of the firmware. The firmware binary format |
| has a field that specifies the actual size of the firmware, but it |
| might not be possible to read any part of the firmware unless some |
| local storage is allocated to hold the entire firmware first. |
| |
| - CONFIG_SYS_QE_FMAN_FW_IN_NOR |
| Specifies that QE/FMAN firmware is located in NOR flash, mapped as |
| normal addressable memory via the LBC. CONFIG_SYS_FMAN_FW_ADDR is the |
| virtual address in NOR flash. |
| |
| - CONFIG_SYS_QE_FMAN_FW_IN_NAND |
| Specifies that QE/FMAN firmware is located in NAND flash. |
| CONFIG_SYS_FMAN_FW_ADDR is the offset within NAND flash. |
| |
| - CONFIG_SYS_QE_FMAN_FW_IN_MMC |
| Specifies that QE/FMAN firmware is located on the primary SD/MMC |
| device. CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device. |
| |
| - CONFIG_SYS_QE_FMAN_FW_IN_REMOTE |
| Specifies that QE/FMAN firmware is located in the remote (master) |
| memory space. CONFIG_SYS_FMAN_FW_ADDR is a virtual address which |
| can be mapped from slave TLB->slave LAW->slave SRIO or PCIE outbound |
| window->master inbound window->master LAW->the ucode address in |
| master's memory space. |
| |
| Freescale Layerscape Management Complex Firmware Support: |
| --------------------------------------------------------- |
| The Freescale Layerscape Management Complex (MC) supports the loading of |
| "firmware". |
| This firmware often needs to be loaded during U-Boot booting, so macros |
| are used to identify the storage device (NOR flash, SPI, etc) and the address |
| within that device. |
| |
| - CONFIG_FSL_MC_ENET |
| Enable the MC driver for Layerscape SoCs. |
| |
| Freescale Layerscape Debug Server Support: |
| ------------------------------------------- |
| The Freescale Layerscape Debug Server Support supports the loading of |
| "Debug Server firmware" and triggering SP boot-rom. |
| This firmware often needs to be loaded during U-Boot booting. |
| |
| - CONFIG_SYS_MC_RSV_MEM_ALIGN |
| Define alignment of reserved memory MC requires |
| |
| Reproducible builds |
| ------------------- |
| |
| In order to achieve reproducible builds, timestamps used in the U-Boot build |
| process have to be set to a fixed value. |
| |
| This is done using the SOURCE_DATE_EPOCH environment variable. |
| SOURCE_DATE_EPOCH is to be set on the build host's shell, not as a configuration |
| option for U-Boot or an environment variable in U-Boot. |
| |
| SOURCE_DATE_EPOCH should be set to a number of seconds since the epoch, in UTC. |
| |
| Building the Software: |
| ====================== |
| |
| Building U-Boot has been tested in several native build environments |
| and in many different cross environments. Of course we cannot support |
| all possibly existing versions of cross development tools in all |
| (potentially obsolete) versions. In case of tool chain problems we |
| recommend to use the ELDK (see http://www.denx.de/wiki/DULG/ELDK) |
| which is extensively used to build and test U-Boot. |
| |
| If you are not using a native environment, it is assumed that you |
| have GNU cross compiling tools available in your path. In this case, |
| you must set the environment variable CROSS_COMPILE in your shell. |
| Note that no changes to the Makefile or any other source files are |
| necessary. For example using the ELDK on a 4xx CPU, please enter: |
| |
| $ CROSS_COMPILE=ppc_4xx- |
| $ export CROSS_COMPILE |
| |
| Note: If you wish to generate Windows versions of the utilities in |
| the tools directory you can use the MinGW toolchain |
| (http://www.mingw.org). Set your HOST tools to the MinGW |
| toolchain and execute 'make tools'. For example: |
| |
| $ make HOSTCC=i586-mingw32msvc-gcc HOSTSTRIP=i586-mingw32msvc-strip tools |
| |
| Binaries such as tools/mkimage.exe will be created which can |
| be executed on computers running Windows. |
| |
| U-Boot is intended to be simple to build. After installing the |
| sources you must configure U-Boot for one specific board type. This |
| is done by typing: |
| |
| make NAME_defconfig |
| |
| where "NAME_defconfig" is the name of one of the existing configu- |
| rations; see boards.cfg for supported names. |
| |
| Note: for some board special configuration names may exist; check if |
| additional information is available from the board vendor; for |
| instance, the TQM823L systems are available without (standard) |
| or with LCD support. You can select such additional "features" |
| when choosing the configuration, i. e. |
| |
| make TQM823L_defconfig |
| - will configure for a plain TQM823L, i. e. no LCD support |
| |
| make TQM823L_LCD_defconfig |
| - will configure for a TQM823L with U-Boot console on LCD |
| |
| etc. |
| |
| |
| Finally, type "make all", and you should get some working U-Boot |
| images ready for download to / installation on your system: |
| |
| - "u-boot.bin" is a raw binary image |
| - "u-boot" is an image in ELF binary format |
| - "u-boot.srec" is in Motorola S-Record format |
| |
| By default the build is performed locally and the objects are saved |
| in the source directory. One of the two methods can be used to change |
| this behavior and build U-Boot to some external directory: |
| |
| 1. Add O= to the make command line invocations: |
| |
| make O=/tmp/build distclean |
| make O=/tmp/build NAME_defconfig |
| make O=/tmp/build all |
| |
| 2. Set environment variable KBUILD_OUTPUT to point to the desired location: |
| |
| export KBUILD_OUTPUT=/tmp/build |
| make distclean |
| make NAME_defconfig |
| make all |
| |
| Note that the command line "O=" setting overrides the KBUILD_OUTPUT environment |
| variable. |
| |
| User specific CPPFLAGS, AFLAGS and CFLAGS can be passed to the compiler by |
| setting the according environment variables KCPPFLAGS, KAFLAGS and KCFLAGS. |
| For example to treat all compiler warnings as errors: |
| |
| make KCFLAGS=-Werror |
| |
| Please be aware that the Makefiles assume you are using GNU make, so |
| for instance on NetBSD you might need to use "gmake" instead of |
| native "make". |
| |
| |
| If the system board that you have is not listed, then you will need |
| to port U-Boot to your hardware platform. To do this, follow these |
| steps: |
| |
| 1. Create a new directory to hold your board specific code. Add any |
| files you need. In your board directory, you will need at least |
| the "Makefile" and a "<board>.c". |
| 2. Create a new configuration file "include/configs/<board>.h" for |
| your board. |
| 3. If you're porting U-Boot to a new CPU, then also create a new |
| directory to hold your CPU specific code. Add any files you need. |
| 4. Run "make <board>_defconfig" with your new name. |
| 5. Type "make", and you should get a working "u-boot.srec" file |
| to be installed on your target system. |
| 6. Debug and solve any problems that might arise. |
| [Of course, this last step is much harder than it sounds.] |
| |
| |
| Testing of U-Boot Modifications, Ports to New Hardware, etc.: |
| ============================================================== |
| |
| If you have modified U-Boot sources (for instance added a new board |
| or support for new devices, a new CPU, etc.) you are expected to |
| provide feedback to the other developers. The feedback normally takes |
| the form of a "patch", i. e. a context diff against a certain (latest |
| official or latest in the git repository) version of U-Boot sources. |
| |
| But before you submit such a patch, please verify that your modifi- |
| cation did not break existing code. At least make sure that *ALL* of |
| the supported boards compile WITHOUT ANY compiler warnings. To do so, |
| just run the buildman script (tools/buildman/buildman), which will |
| configure and build U-Boot for ALL supported system. Be warned, this |
| will take a while. Please see the buildman README, or run 'buildman -H' |
| for documentation. |
| |
| |
| See also "U-Boot Porting Guide" below. |
| |
| |
| Monitor Commands - Overview: |
| ============================ |
| |
| go - start application at address 'addr' |
| run - run commands in an environment variable |
| bootm - boot application image from memory |
| bootp - boot image via network using BootP/TFTP protocol |
| bootz - boot zImage from memory |
| tftpboot- boot image via network using TFTP protocol |
| and env variables "ipaddr" and "serverip" |
| (and eventually "gatewayip") |
| tftpput - upload a file via network using TFTP protocol |
| rarpboot- boot image via network using RARP/TFTP protocol |
| diskboot- boot from IDE devicebootd - boot default, i.e., run 'bootcmd' |
| loads - load S-Record file over serial line |
| loadb - load binary file over serial line (kermit mode) |
| md - memory display |
| mm - memory modify (auto-incrementing) |
| nm - memory modify (constant address) |
| mw - memory write (fill) |
| cp - memory copy |
| cmp - memory compare |
| crc32 - checksum calculation |
| i2c - I2C sub-system |
| sspi - SPI utility commands |
| base - print or set address offset |
| printenv- print environment variables |
| setenv - set environment variables |
| saveenv - save environment variables to persistent storage |
| protect - enable or disable FLASH write protection |
| erase - erase FLASH memory |
| flinfo - print FLASH memory information |
| nand - NAND memory operations (see doc/README.nand) |
| bdinfo - print Board Info structure |
| iminfo - print header information for application image |
| coninfo - print console devices and informations |
| ide - IDE sub-system |
| loop - infinite loop on address range |
| loopw - infinite write loop on address range |
| mtest - simple RAM test |
| icache - enable or disable instruction cache |
| dcache - enable or disable data cache |
| reset - Perform RESET of the CPU |
| echo - echo args to console |
| version - print monitor version |
| help - print online help |
| ? - alias for 'help' |
| |
| |
| Monitor Commands - Detailed Description: |
| ======================================== |
| |
| TODO. |
| |
| For now: just type "help <command>". |
| |
| |
| Environment Variables: |
| ====================== |
| |
| U-Boot supports user configuration using Environment Variables which |
| can be made persistent by saving to Flash memory. |
| |
| Environment Variables are set using "setenv", printed using |
| "printenv", and saved to Flash using "saveenv". Using "setenv" |
| without a value can be used to delete a variable from the |
| environment. As long as you don't save the environment you are |
| working with an in-memory copy. In case the Flash area containing the |
| environment is erased by accident, a default environment is provided. |
| |
| Some configuration options can be set using Environment Variables. |
| |
| List of environment variables (most likely not complete): |
| |
| baudrate - see CONFIG_BAUDRATE |
| |
| bootdelay - see CONFIG_BOOTDELAY |
| |
| bootcmd - see CONFIG_BOOTCOMMAND |
| |
| bootargs - Boot arguments when booting an RTOS image |
| |
| bootfile - Name of the image to load with TFTP |
| |
| bootm_low - Memory range available for image processing in the bootm |
| command can be restricted. This variable is given as |
| a hexadecimal number and defines lowest address allowed |
| for use by the bootm command. See also "bootm_size" |
| environment variable. Address defined by "bootm_low" is |
| also the base of the initial memory mapping for the Linux |
| kernel -- see the description of CONFIG_SYS_BOOTMAPSZ and |
| bootm_mapsize. |
| |
| bootm_mapsize - Size of the initial memory mapping for the Linux kernel. |
| This variable is given as a hexadecimal number and it |
| defines the size of the memory region starting at base |
| address bootm_low that is accessible by the Linux kernel |
| during early boot. If unset, CONFIG_SYS_BOOTMAPSZ is used |
| as the default value if it is defined, and bootm_size is |
| used otherwise. |
| |
| bootm_size - Memory range available for image processing in the bootm |
| command can be restricted. This variable is given as |
| a hexadecimal number and defines the size of the region |
| allowed for use by the bootm command. See also "bootm_low" |
| environment variable. |
| |
| updatefile - Location of the software update file on a TFTP server, used |
| by the automatic software update feature. Please refer to |
| documentation in doc/README.update for more details. |
| |
| autoload - if set to "no" (any string beginning with 'n'), |
| "bootp" will just load perform a lookup of the |
| configuration from the BOOTP server, but not try to |
| load any image using TFTP |
| |
| autostart - if set to "yes", an image loaded using the "bootp", |
| "rarpboot", "tftpboot" or "diskboot" commands will |
| be automatically started (by internally calling |
| "bootm") |
| |
| If set to "no", a standalone image passed to the |
| "bootm" command will be copied to the load address |
| (and eventually uncompressed), but NOT be started. |
| This can be used to load and uncompress arbitrary |
| data. |
| |
| fdt_high - if set this restricts the maximum address that the |
| flattened device tree will be copied into upon boot. |
| For example, if you have a system with 1 GB memory |
| at physical address 0x10000000, while Linux kernel |
| only recognizes the first 704 MB as low memory, you |
| may need to set fdt_high as 0x3C000000 to have the |
| device tree blob be copied to the maximum address |
| of the 704 MB low memory, so that Linux kernel can |
| access it during the boot procedure. |
| |
| If this is set to the special value 0xFFFFFFFF then |
| the fdt will not be copied at all on boot. For this |
| to work it must reside in writable memory, have |
| sufficient padding on the end of it for u-boot to |
| add the information it needs into it, and the memory |
| must be accessible by the kernel. |
| |
| fdtcontroladdr- if set this is the address of the control flattened |
| device tree used by U-Boot when CONFIG_OF_CONTROL is |
| defined. |
| |
| i2cfast - (PPC405GP|PPC405EP only) |
| if set to 'y' configures Linux I2C driver for fast |
| mode (400kHZ). This environment variable is used in |
| initialization code. So, for changes to be effective |
| it must be saved and board must be reset. |
| |
| initrd_high - restrict positioning of initrd images: |
| If this variable is not set, initrd images will be |
| copied to the highest possible address in RAM; this |
| is usually what you want since it allows for |
| maximum initrd size. If for some reason you want to |
| make sure that the initrd image is loaded below the |
| CONFIG_SYS_BOOTMAPSZ limit, you can set this environment |
| variable to a value of "no" or "off" or "0". |
| Alternatively, you can set it to a maximum upper |
| address to use (U-Boot will still check that it |
| does not overwrite the U-Boot stack and data). |
| |
| For instance, when you have a system with 16 MB |
| RAM, and want to reserve 4 MB from use by Linux, |
| you can do this by adding "mem=12M" to the value of |
| the "bootargs" variable. However, now you must make |
| sure that the initrd image is placed in the first |
| 12 MB as well - this can be done with |
| |
| setenv initrd_high 00c00000 |
| |
| If you set initrd_high to 0xFFFFFFFF, this is an |
| indication to U-Boot that all addresses are legal |
| for the Linux kernel, including addresses in flash |
| memory. In this case U-Boot will NOT COPY the |
| ramdisk at all. This may be useful to reduce the |
| boot time on your system, but requires that this |
| feature is supported by your Linux kernel. |
| |
| ipaddr - IP address; needed for tftpboot command |
| |
| loadaddr - Default load address for commands like "bootp", |
| "rarpboot", "tftpboot", "loadb" or "diskboot" |
| |
| loads_echo - see CONFIG_LOADS_ECHO |
| |
| serverip - TFTP server IP address; needed for tftpboot command |
| |
| bootretry - see CONFIG_BOOT_RETRY_TIME |
| |
| bootdelaykey - see CONFIG_AUTOBOOT_DELAY_STR |
| |
| bootstopkey - see CONFIG_AUTOBOOT_STOP_STR |
| |
| ethprime - controls which interface is used first. |
| |
| ethact - controls which interface is currently active. |
| For example you can do the following |
| |
| => setenv ethact FEC |
| => ping 192.168.0.1 # traffic sent on FEC |
| => setenv ethact SCC |
| => ping 10.0.0.1 # traffic sent on SCC |
| |
| ethrotate - When set to "no" U-Boot does not go through all |
| available network interfaces. |
| It just stays at the currently selected interface. |
| |
| netretry - When set to "no" each network operation will |
| either succeed or fail without retrying. |
| When set to "once" the network operation will |
| fail when all the available network interfaces |
| are tried once without success. |
| Useful on scripts which control the retry operation |
| themselves. |
| |
| npe_ucode - set load address for the NPE microcode |
| |
| silent_linux - If set then Linux will be told to boot silently, by |
| changing the console to be empty. If "yes" it will be |
| made silent. If "no" it will not be made silent. If |
| unset, then it will be made silent if the U-Boot console |
| is silent. |
| |
| tftpsrcp - If this is set, the value is used for TFTP's |
| UDP source port. |
| |
| tftpdstp - If this is set, the value is used for TFTP's UDP |
| destination port instead of the Well Know Port 69. |
| |
| tftpblocksize - Block size to use for TFTP transfers; if not set, |
| we use the TFTP server's default block size |
| |
| tftptimeout - Retransmission timeout for TFTP packets (in milli- |
| seconds, minimum value is 1000 = 1 second). Defines |
| when a packet is considered to be lost so it has to |
| be retransmitted. The default is 5000 = 5 seconds. |
| Lowering this value may make downloads succeed |
| faster in networks with high packet loss rates or |
| with unreliable TFTP servers. |
| |
| tftptimeoutcountmax - maximum count of TFTP timeouts (no |
| unit, minimum value = 0). Defines how many timeouts |
| can happen during a single file transfer before that |
| transfer is aborted. The default is 10, and 0 means |
| 'no timeouts allowed'. Increasing this value may help |
| downloads succeed with high packet loss rates, or with |
| unreliable TFTP servers or client hardware. |
| |
| vlan - When set to a value < 4095 the traffic over |
| Ethernet is encapsulated/received over 802.1q |
| VLAN tagged frames. |
| |
| bootpretryperiod - Period during which BOOTP/DHCP sends retries. |
| Unsigned value, in milliseconds. If not set, the period will |
| be either the default (28000), or a value based on |
| CONFIG_NET_RETRY_COUNT, if defined. This value has |
| precedence over the valu based on CONFIG_NET_RETRY_COUNT. |
| |
| The following image location variables contain the location of images |
| used in booting. The "Image" column gives the role of the image and is |
| not an environment variable name. The other columns are environment |
| variable names. "File Name" gives the name of the file on a TFTP |
| server, "RAM Address" gives the location in RAM the image will be |
| loaded to, and "Flash Location" gives the image's address in NOR |
| flash or offset in NAND flash. |
| |
| *Note* - these variables don't have to be defined for all boards, some |
| boards currently use other variables for these purposes, and some |
| boards use these variables for other purposes. |
| |
| Image File Name RAM Address Flash Location |
| ----- --------- ----------- -------------- |
| u-boot u-boot u-boot_addr_r u-boot_addr |
| Linux kernel bootfile kernel_addr_r kernel_addr |
| device tree blob fdtfile fdt_addr_r fdt_addr |
| ramdisk ramdiskfile ramdisk_addr_r ramdisk_addr |
| |
| The following environment variables may be used and automatically |
| updated by the network boot commands ("bootp" and "rarpboot"), |
| depending the information provided by your boot server: |
| |
| bootfile - see above |
| dnsip - IP address of your Domain Name Server |
| dnsip2 - IP address of your secondary Domain Name Server |
| gatewayip - IP address of the Gateway (Router) to use |
| hostname - Target hostname |
| ipaddr - see above |
| netmask - Subnet Mask |
| rootpath - Pathname of the root filesystem on the NFS server |
| serverip - see above |
| |
| |
| There are two special Environment Variables: |
| |
| serial# - contains hardware identification information such |
| as type string and/or serial number |
| ethaddr - Ethernet address |
| |
| These variables can be set only once (usually during manufacturing of |
| the board). U-Boot refuses to delete or overwrite these variables |
| once they have been set once. |
| |
| |
| Further special Environment Variables: |
| |
| ver - Contains the U-Boot version string as printed |
| with the "version" command. This variable is |
| readonly (see CONFIG_VERSION_VARIABLE). |
| |
| |
| Please note that changes to some configuration parameters may take |
| only effect after the next boot (yes, that's just like Windoze :-). |
| |
| |
| Callback functions for environment variables: |
| --------------------------------------------- |
| |
| For some environment variables, the behavior of u-boot needs to change |
| when their values are changed. This functionality allows functions to |
| be associated with arbitrary variables. On creation, overwrite, or |
| deletion, the callback will provide the opportunity for some side |
| effect to happen or for the change to be rejected. |
| |
| The callbacks are named and associated with a function using the |
| U_BOOT_ENV_CALLBACK macro in your board or driver code. |
| |
| These callbacks are associated with variables in one of two ways. The |
| static list can be added to by defining CONFIG_ENV_CALLBACK_LIST_STATIC |
| in the board configuration to a string that defines a list of |
| associations. The list must be in the following format: |
| |
| entry = variable_name[:callback_name] |
| list = entry[,list] |
| |
| If the callback name is not specified, then the callback is deleted. |
| Spaces are also allowed anywhere in the list. |
| |
| Callbacks can also be associated by defining the ".callbacks" variable |
| with the same list format above. Any association in ".callbacks" will |
| override any association in the static list. You can define |
| CONFIG_ENV_CALLBACK_LIST_DEFAULT to a list (string) to define the |
| ".callbacks" environment variable in the default or embedded environment. |
| |
| If CONFIG_REGEX is defined, the variable_name above is evaluated as a |
| regular expression. This allows multiple variables to be connected to |
| the same callback without explicitly listing them all out. |
| |
| |
| Command Line Parsing: |
| ===================== |
| |
| There are two different command line parsers available with U-Boot: |
| the old "simple" one, and the much more powerful "hush" shell: |
| |
| Old, simple command line parser: |
| -------------------------------- |
| |
| - supports environment variables (through setenv / saveenv commands) |
| - several commands on one line, separated by ';' |
| - variable substitution using "... ${name} ..." syntax |
| - special characters ('$', ';') can be escaped by prefixing with '\', |
| for example: |
| setenv bootcmd bootm \${address} |
| - You can also escape text by enclosing in single apostrophes, for example: |
| setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off' |
| |
| Hush shell: |
| ----------- |
| |
| - similar to Bourne shell, with control structures like |
| if...then...else...fi, for...do...done; while...do...done, |
| until...do...done, ... |
| - supports environment ("global") variables (through setenv / saveenv |
| commands) and local shell variables (through standard shell syntax |
| "name=value"); only environment variables can be used with "run" |
| command |
| |
| General rules: |
| -------------- |
| |
| (1) If a command line (or an environment variable executed by a "run" |
| command) contains several commands separated by semicolon, and |
| one of these commands fails, then the remaining commands will be |
| executed anyway. |
| |
| (2) If you execute several variables with one call to run (i. e. |
| calling run with a list of variables as arguments), any failing |
| command will cause "run" to terminate, i. e. the remaining |
| variables are not executed. |
| |
| Note for Redundant Ethernet Interfaces: |
| ======================================= |
| |
| Some boards come with redundant Ethernet interfaces; U-Boot supports |
| such configurations and is capable of automatic selection of a |
| "working" interface when needed. MAC assignment works as follows: |
| |
| Network interfaces are numbered eth0, eth1, eth2, ... Corresponding |
| MAC addresses can be stored in the environment as "ethaddr" (=>eth0), |
| "eth1addr" (=>eth1), "eth2addr", ... |
| |
| If the network interface stores some valid MAC address (for instance |
| in SROM), this is used as default address if there is NO correspon- |
| ding setting in the environment; if the corresponding environment |
| variable is set, this overrides the settings in the card; that means: |
| |
| o If the SROM has a valid MAC address, and there is no address in the |
| environment, the SROM's address is used. |
| |
| o If there is no valid address in the SROM, and a definition in the |
| environment exists, then the value from the environment variable is |
| used. |
| |
| o If both the SROM and the environment contain a MAC address, and |
| both addresses are the same, this MAC address is used. |
| |
| o If both the SROM and the environment contain a MAC address, and the |
| addresses differ, the value from the environment is used and a |
| warning is printed. |
| |
| o If neither SROM nor the environment contain a MAC address, an error |
| is raised. If CONFIG_NET_RANDOM_ETHADDR is defined, then in this case |
| a random, locally-assigned MAC is used. |
| |
| If Ethernet drivers implement the 'write_hwaddr' function, valid MAC addresses |
| will be programmed into hardware as part of the initialization process. This |
| may be skipped by setting the appropriate 'ethmacskip' environment variable. |
| The naming convention is as follows: |
| "ethmacskip" (=>eth0), "eth1macskip" (=>eth1) etc. |
| |
| Image Formats: |
| ============== |
| |
| U-Boot is capable of booting (and performing other auxiliary operations on) |
| images in two formats: |
| |
| New uImage format (FIT) |
| ----------------------- |
| |
| Flexible and powerful format based on Flattened Image Tree -- FIT (similar |
| to Flattened Device Tree). It allows the use of images with multiple |
| components (several kernels, ramdisks, etc.), with contents protected by |
| SHA1, MD5 or CRC32. More details are found in the doc/uImage.FIT directory. |
| |
| |
| Old uImage format |
| ----------------- |
| |
| Old image format is based on binary files which can be basically anything, |
| preceded by a special header; see the definitions in include/image.h for |
| details; basically, the header defines the following image properties: |
| |
| * Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD, |
| 4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks, |
| LynxOS, pSOS, QNX, RTEMS, INTEGRITY; |
| Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, LynxOS, |
| INTEGRITY). |
| * Target CPU Architecture (Provisions for Alpha, ARM, Intel x86, |
| IA64, MIPS, NDS32, Nios II, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit; |
| Currently supported: ARM, Intel x86, MIPS, NDS32, Nios II, PowerPC). |
| * Compression Type (uncompressed, gzip, bzip2) |
| * Load Address |
| * Entry Point |
| * Image Name |
| * Image Timestamp |
| |
| The header is marked by a special Magic Number, and both the header |
| and the data portions of the image are secured against corruption by |
| CRC32 checksums. |
| |
| |
| Linux Support: |
| ============== |
| |
| Although U-Boot should support any OS or standalone application |
| easily, the main focus has always been on Linux during the design of |
| U-Boot. |
| |
| U-Boot includes many features that so far have been part of some |
| special "boot loader" code within the Linux kernel. Also, any |
| "initrd" images to be used are no longer part of one big Linux image; |
| instead, kernel and "initrd" are separate images. This implementation |
| serves several purposes: |
| |
| - the same features can be used for other OS or standalone |
| applications (for instance: using compressed images to reduce the |
| Flash memory footprint) |
| |
| - it becomes much easier to port new Linux kernel versions because |
| lots of low-level, hardware dependent stuff are done by U-Boot |
| |
| - the same Linux kernel image can now be used with different "initrd" |
| images; of course this also means that different kernel images can |
| be run with the same "initrd". This makes testing easier (you don't |
| have to build a new "zImage.initrd" Linux image when you just |
| change a file in your "initrd"). Also, a field-upgrade of the |
| software is easier now. |
| |
| |
| Linux HOWTO: |
| ============ |
| |
| Porting Linux to U-Boot based systems: |
| --------------------------------------- |
| |
| U-Boot cannot save you from doing all the necessary modifications to |
| configure the Linux device drivers for use with your target hardware |
| (no, we don't intend to provide a full virtual machine interface to |
| Linux :-). |
| |
| But now you can ignore ALL boot loader code (in arch/powerpc/mbxboot). |
| |
| Just make sure your machine specific header file (for instance |
| include/asm-ppc/tqm8xx.h) includes the same definition of the Board |
| Information structure as we define in include/asm-<arch>/u-boot.h, |
| and make sure that your definition of IMAP_ADDR uses the same value |
| as your U-Boot configuration in CONFIG_SYS_IMMR. |
| |
| Note that U-Boot now has a driver model, a unified model for drivers. |
| If you are adding a new driver, plumb it into driver model. If there |
| is no uclass available, you are encouraged to create one. See |
| doc/driver-model. |
| |
| |
| Configuring the Linux kernel: |
| ----------------------------- |
| |
| No specific requirements for U-Boot. Make sure you have some root |
| device (initial ramdisk, NFS) for your target system. |
| |
| |
| Building a Linux Image: |
| ----------------------- |
| |
| With U-Boot, "normal" build targets like "zImage" or "bzImage" are |
| not used. If you use recent kernel source, a new build target |
| "uImage" will exist which automatically builds an image usable by |
| U-Boot. Most older kernels also have support for a "pImage" target, |
| which was introduced for our predecessor project PPCBoot and uses a |
| 100% compatible format. |
| |
| Example: |
| |
| make TQM850L_defconfig |
| make oldconfig |
| make dep |
| make uImage |
| |
| The "uImage" build target uses a special tool (in 'tools/mkimage') to |
| encapsulate a compressed Linux kernel image with header information, |
| CRC32 checksum etc. for use with U-Boot. This is what we are doing: |
| |
| * build a standard "vmlinux" kernel image (in ELF binary format): |
| |
| * convert the kernel into a raw binary image: |
| |
| ${CROSS_COMPILE}-objcopy -O binary \ |
| -R .note -R .comment \ |
| -S vmlinux linux.bin |
| |
| * compress the binary image: |
| |
| gzip -9 linux.bin |
| |
| * package compressed binary image for U-Boot: |
| |
| mkimage -A ppc -O linux -T kernel -C gzip \ |
| -a 0 -e 0 -n "Linux Kernel Image" \ |
| -d linux.bin.gz uImage |
| |
| |
| The "mkimage" tool can also be used to create ramdisk images for use |
| with U-Boot, either separated from the Linux kernel image, or |
| combined into one file. "mkimage" encapsulates the images with a 64 |
| byte header containing information about target architecture, |
| operating system, image type, compression method, entry points, time |
| stamp, CRC32 checksums, etc. |
| |
| "mkimage" can be called in two ways: to verify existing images and |
| print the header information, or to build new images. |
| |
| In the first form (with "-l" option) mkimage lists the information |
| contained in the header of an existing U-Boot image; this includes |
| checksum verification: |
| |
| tools/mkimage -l image |
| -l ==> list image header information |
| |
| The second form (with "-d" option) is used to build a U-Boot image |
| from a "data file" which is used as image payload: |
| |
| tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \ |
| -n name -d data_file image |
| -A ==> set architecture to 'arch' |
| -O ==> set operating system to 'os' |
| -T ==> set image type to 'type' |
| -C ==> set compression type 'comp' |
| -a ==> set load address to 'addr' (hex) |
| -e ==> set entry point to 'ep' (hex) |
| -n ==> set image name to 'name' |
| -d ==> use image data from 'datafile' |
| |
| Right now, all Linux kernels for PowerPC systems use the same load |
| address (0x00000000), but the entry point address depends on the |
| kernel version: |
| |
| - 2.2.x kernels have the entry point at 0x0000000C, |
| - 2.3.x and later kernels have the entry point at 0x00000000. |
| |
| So a typical call to build a U-Boot image would read: |
| |
| -> tools/mkimage -n '2.4.4 kernel for TQM850L' \ |
| > -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \ |
| > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz \ |
| > examples/uImage.TQM850L |
| Image Name: 2.4.4 kernel for TQM850L |
| Created: Wed Jul 19 02:34:59 2000 |
| Image Type: PowerPC Linux Kernel Image (gzip compressed) |
| Data Size: 335725 Bytes = 327.86 kB = 0.32 MB |
| Load Address: 0x00000000 |
| Entry Point: 0x00000000 |
| |
| To verify the contents of the image (or check for corruption): |
| |
| -> tools/mkimage -l examples/uImage.TQM850L |
| Image Name: 2.4.4 kernel for TQM850L |
| Created: Wed Jul 19 02:34:59 2000 |
| Image Type: PowerPC Linux Kernel Image (gzip compressed) |
| Data Size: 335725 Bytes = 327.86 kB = 0.32 MB |
| Load Address: 0x00000000 |
| Entry Point: 0x00000000 |
| |
| NOTE: for embedded systems where boot time is critical you can trade |
| speed for memory and install an UNCOMPRESSED image instead: this |
| needs more space in Flash, but boots much faster since it does not |
|