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wdenkc6097192002-11-03 00:24:07 +00001#
wdenk151ab832005-02-24 22:44:16 +00002# (C) Copyright 2000 - 2005
wdenkc6097192002-11-03 00:24:07 +00003# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4#
5# See file CREDITS for list of people who contributed to this
6# project.
7#
8# This program is free software; you can redistribute it and/or
9# modify it under the terms of the GNU General Public License as
10# published by the Free Software Foundation; either version 2 of
11# the License, or (at your option) any later version.
12#
13# This program is distributed in the hope that it will be useful,
14# but WITHOUT ANY WARRANTY; without even the implied warranty of
15# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16# GNU General Public License for more details.
17#
18# You should have received a copy of the GNU General Public License
19# along with this program; if not, write to the Free Software
20# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21# MA 02111-1307 USA
22#
23
24Summary:
25========
26
wdenk24ee89b2002-11-03 17:56:27 +000027This directory contains the source code for U-Boot, a boot loader for
wdenke86e5a02004-10-17 21:12:06 +000028Embedded boards based on PowerPC, ARM, MIPS and several other
29processors, which can be installed in a boot ROM and used to
30initialize and test the hardware or to download and run application
31code.
wdenkc6097192002-11-03 00:24:07 +000032
33The development of U-Boot is closely related to Linux: some parts of
wdenk24ee89b2002-11-03 17:56:27 +000034the source code originate in the Linux source tree, we have some
35header files in common, and special provision has been made to
wdenkc6097192002-11-03 00:24:07 +000036support booting of Linux images.
37
38Some attention has been paid to make this software easily
39configurable and extendable. For instance, all monitor commands are
40implemented with the same call interface, so that it's very easy to
41add new commands. Also, instead of permanently adding rarely used
42code (for instance hardware test utilities) to the monitor, you can
43load and run it dynamically.
44
45
46Status:
47=======
48
49In general, all boards for which a configuration option exists in the
wdenk24ee89b2002-11-03 17:56:27 +000050Makefile have been tested to some extent and can be considered
wdenkc6097192002-11-03 00:24:07 +000051"working". In fact, many of them are used in production systems.
52
wdenk24ee89b2002-11-03 17:56:27 +000053In case of problems see the CHANGELOG and CREDITS files to find out
wdenkc6097192002-11-03 00:24:07 +000054who contributed the specific port.
55
wdenkc6097192002-11-03 00:24:07 +000056
57Where to get help:
58==================
59
wdenk24ee89b2002-11-03 17:56:27 +000060In case you have questions about, problems with or contributions for
61U-Boot you should send a message to the U-Boot mailing list at
62<u-boot-users@lists.sourceforge.net>. There is also an archive of
63previous traffic on the mailing list - please search the archive
wdenkc6097192002-11-03 00:24:07 +000064before asking FAQ's. Please see
65http://lists.sourceforge.net/lists/listinfo/u-boot-users/
66
67
68Where we come from:
69===================
70
71- start from 8xxrom sources
wdenk24ee89b2002-11-03 17:56:27 +000072- create PPCBoot project (http://sourceforge.net/projects/ppcboot)
wdenkc6097192002-11-03 00:24:07 +000073- clean up code
74- make it easier to add custom boards
75- make it possible to add other [PowerPC] CPUs
76- extend functions, especially:
77 * Provide extended interface to Linux boot loader
78 * S-Record download
79 * network boot
80 * PCMCIA / CompactFLash / ATA disk / SCSI ... boot
wdenk24ee89b2002-11-03 17:56:27 +000081- create ARMBoot project (http://sourceforge.net/projects/armboot)
wdenkc6097192002-11-03 00:24:07 +000082- add other CPU families (starting with ARM)
wdenk24ee89b2002-11-03 17:56:27 +000083- create U-Boot project (http://sourceforge.net/projects/u-boot)
84
85
86Names and Spelling:
87===================
88
89The "official" name of this project is "Das U-Boot". The spelling
90"U-Boot" shall be used in all written text (documentation, comments
91in source files etc.). Example:
92
93 This is the README file for the U-Boot project.
94
95File names etc. shall be based on the string "u-boot". Examples:
96
97 include/asm-ppc/u-boot.h
98
99 #include <asm/u-boot.h>
100
101Variable names, preprocessor constants etc. shall be either based on
102the string "u_boot" or on "U_BOOT". Example:
103
104 U_BOOT_VERSION u_boot_logo
105 IH_OS_U_BOOT u_boot_hush_start
wdenkc6097192002-11-03 00:24:07 +0000106
107
wdenk93f19cc2002-12-17 17:55:09 +0000108Versioning:
109===========
110
111U-Boot uses a 3 level version number containing a version, a
112sub-version, and a patchlevel: "U-Boot-2.34.5" means version "2",
113sub-version "34", and patchlevel "4".
114
115The patchlevel is used to indicate certain stages of development
116between released versions, i. e. officially released versions of
117U-Boot will always have a patchlevel of "0".
118
119
wdenkc6097192002-11-03 00:24:07 +0000120Directory Hierarchy:
121====================
122
wdenk7152b1d2003-09-05 23:19:14 +0000123- board Board dependent files
124- common Misc architecture independent functions
wdenkc6097192002-11-03 00:24:07 +0000125- cpu CPU specific files
wdenk983fda82004-10-28 00:09:35 +0000126 - 74xx_7xx Files specific to Freescale MPC74xx and 7xx CPUs
wdenk11dadd52004-02-27 00:07:27 +0000127 - arm720t Files specific to ARM 720 CPUs
128 - arm920t Files specific to ARM 920 CPUs
wdenka85f9f22005-04-06 13:52:31 +0000129 - at91rm9200 Files specific to Atmel AT91RM9200 CPU
wdenk983fda82004-10-28 00:09:35 +0000130 - imx Files specific to Freescale MC9328 i.MX CPUs
wdenk1d9f4102004-10-09 22:21:29 +0000131 - s3c24x0 Files specific to Samsung S3C24X0 CPUs
wdenk11dadd52004-02-27 00:07:27 +0000132 - arm925t Files specific to ARM 925 CPUs
133 - arm926ejs Files specific to ARM 926 CPUs
wdenk8ed96042005-01-09 23:16:25 +0000134 - arm1136 Files specific to ARM 1136 CPUs
Wolfgang Denk72a087e2006-10-24 14:27:35 +0200135 - at32ap Files specific to Atmel AVR32 AP CPUs
wdenk11dadd52004-02-27 00:07:27 +0000136 - i386 Files specific to i386 CPUs
137 - ixp Files specific to Intel XScale IXP CPUs
wdenk983fda82004-10-28 00:09:35 +0000138 - mcf52x2 Files specific to Freescale ColdFire MCF52x2 CPUs
TsiChung Liew8e585f02007-06-18 13:50:13 -0500139 - mcf532x Files specific to Freescale ColdFire MCF5329 CPUs
TsiChungLiew8ae158c2007-08-16 15:05:11 -0500140 - mcf5445x Files specific to Freescale ColdFire MCF5445x CPUs
wdenk11dadd52004-02-27 00:07:27 +0000141 - mips Files specific to MIPS CPUs
wdenk983fda82004-10-28 00:09:35 +0000142 - mpc5xx Files specific to Freescale MPC5xx CPUs
143 - mpc5xxx Files specific to Freescale MPC5xxx CPUs
144 - mpc8xx Files specific to Freescale MPC8xx CPUs
145 - mpc8220 Files specific to Freescale MPC8220 CPUs
146 - mpc824x Files specific to Freescale MPC824x CPUs
147 - mpc8260 Files specific to Freescale MPC8260 CPUs
148 - mpc85xx Files specific to Freescale MPC85xx CPUs
wdenk11dadd52004-02-27 00:07:27 +0000149 - nios Files specific to Altera NIOS CPUs
wdenk5c952cf2004-10-10 21:27:30 +0000150 - nios2 Files specific to Altera Nios-II CPUs
Wolfgang Denk0c8721a2005-09-23 11:05:55 +0200151 - ppc4xx Files specific to AMCC PowerPC 4xx CPUs
wdenk11dadd52004-02-27 00:07:27 +0000152 - pxa Files specific to Intel XScale PXA CPUs
153 - s3c44b0 Files specific to Samsung S3C44B0 CPUs
154 - sa1100 Files specific to Intel StrongARM SA1100 CPUs
wdenkc6097192002-11-03 00:24:07 +0000155- disk Code for disk drive partition handling
156- doc Documentation (don't expect too much)
wdenk7152b1d2003-09-05 23:19:14 +0000157- drivers Commonly used device drivers
wdenkc6097192002-11-03 00:24:07 +0000158- dtt Digital Thermometer and Thermostat drivers
159- examples Example code for standalone applications, etc.
160- include Header Files
wdenk11dadd52004-02-27 00:07:27 +0000161- lib_arm Files generic to ARM architecture
Wolfgang Denk7b64fef2006-10-24 14:21:16 +0200162- lib_avr32 Files generic to AVR32 architecture
wdenk11dadd52004-02-27 00:07:27 +0000163- lib_generic Files generic to all architectures
164- lib_i386 Files generic to i386 architecture
165- lib_m68k Files generic to m68k architecture
166- lib_mips Files generic to MIPS architecture
167- lib_nios Files generic to NIOS architecture
168- lib_ppc Files generic to PowerPC architecture
Gerald Van Baren213bf8c2007-03-31 12:23:51 -0400169- libfdt Library files to support flattened device trees
wdenkc6097192002-11-03 00:24:07 +0000170- net Networking code
wdenkc6097192002-11-03 00:24:07 +0000171- post Power On Self Test
wdenkc6097192002-11-03 00:24:07 +0000172- rtc Real Time Clock drivers
173- tools Tools to build S-Record or U-Boot images, etc.
174
wdenkc6097192002-11-03 00:24:07 +0000175Software Configuration:
176=======================
177
178Configuration is usually done using C preprocessor defines; the
179rationale behind that is to avoid dead code whenever possible.
180
181There are two classes of configuration variables:
182
183* Configuration _OPTIONS_:
184 These are selectable by the user and have names beginning with
185 "CONFIG_".
186
187* Configuration _SETTINGS_:
188 These depend on the hardware etc. and should not be meddled with if
189 you don't know what you're doing; they have names beginning with
190 "CFG_".
191
192Later we will add a configuration tool - probably similar to or even
193identical to what's used for the Linux kernel. Right now, we have to
194do the configuration by hand, which means creating some symbolic
195links and editing some configuration files. We use the TQM8xxL boards
196as an example here.
197
198
199Selection of Processor Architecture and Board Type:
200---------------------------------------------------
201
202For all supported boards there are ready-to-use default
203configurations available; just type "make <board_name>_config".
204
205Example: For a TQM823L module type:
206
207 cd u-boot
208 make TQM823L_config
209
210For the Cogent platform, you need to specify the cpu type as well;
211e.g. "make cogent_mpc8xx_config". And also configure the cogent
212directory according to the instructions in cogent/README.
213
214
215Configuration Options:
216----------------------
217
218Configuration depends on the combination of board and CPU type; all
219such information is kept in a configuration file
220"include/configs/<board_name>.h".
221
222Example: For a TQM823L module, all configuration settings are in
223"include/configs/TQM823L.h".
224
225
wdenk7f6c2cb2002-11-10 22:06:23 +0000226Many of the options are named exactly as the corresponding Linux
227kernel configuration options. The intention is to make it easier to
228build a config tool - later.
229
230
wdenkc6097192002-11-03 00:24:07 +0000231The following options need to be configured:
232
Kim Phillips26281142007-08-10 13:28:25 -0500233- CPU Type: Define exactly one, e.g. CONFIG_MPC85XX.
wdenkc6097192002-11-03 00:24:07 +0000234
Kim Phillips26281142007-08-10 13:28:25 -0500235- Board Type: Define exactly one, e.g. CONFIG_MPC8540ADS.
Wolfgang Denk6ccec442006-10-24 14:42:37 +0200236
237- CPU Daughterboard Type: (if CONFIG_ATSTK1000 is defined)
Haavard Skinnemoen09ea0de2007-11-01 12:44:20 +0100238 Define exactly one, e.g. CONFIG_ATSTK1002
wdenkc6097192002-11-03 00:24:07 +0000239
240- CPU Module Type: (if CONFIG_COGENT is defined)
241 Define exactly one of
242 CONFIG_CMA286_60_OLD
243--- FIXME --- not tested yet:
244 CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P,
245 CONFIG_CMA287_23, CONFIG_CMA287_50
246
247- Motherboard Type: (if CONFIG_COGENT is defined)
248 Define exactly one of
249 CONFIG_CMA101, CONFIG_CMA102
250
251- Motherboard I/O Modules: (if CONFIG_COGENT is defined)
252 Define one or more of
253 CONFIG_CMA302
254
255- Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined)
256 Define one or more of
257 CONFIG_LCD_HEARTBEAT - update a character position on
258 the lcd display every second with
259 a "rotator" |\-/|\-/
260
wdenk2535d602003-07-17 23:16:40 +0000261- Board flavour: (if CONFIG_MPC8260ADS is defined)
262 CONFIG_ADSTYPE
263 Possible values are:
264 CFG_8260ADS - original MPC8260ADS
wdenk180d3f72004-01-04 16:28:35 +0000265 CFG_8266ADS - MPC8266ADS
wdenk54387ac2003-10-08 22:45:44 +0000266 CFG_PQ2FADS - PQ2FADS-ZU or PQ2FADS-VR
wdenk04a85b32004-04-15 18:22:41 +0000267 CFG_8272ADS - MPC8272ADS
wdenk2535d602003-07-17 23:16:40 +0000268
wdenkc6097192002-11-03 00:24:07 +0000269- MPC824X Family Member (if CONFIG_MPC824X is defined)
wdenk5da627a2003-10-09 20:09:04 +0000270 Define exactly one of
271 CONFIG_MPC8240, CONFIG_MPC8245
wdenkc6097192002-11-03 00:24:07 +0000272
wdenk75d1ea72004-01-31 20:06:54 +0000273- 8xx CPU Options: (if using an MPC8xx cpu)
wdenk66ca92a2004-09-28 17:59:53 +0000274 CONFIG_8xx_GCLK_FREQ - deprecated: CPU clock if
275 get_gclk_freq() cannot work
wdenk5da627a2003-10-09 20:09:04 +0000276 e.g. if there is no 32KHz
277 reference PIT/RTC clock
wdenk66ca92a2004-09-28 17:59:53 +0000278 CONFIG_8xx_OSCLK - PLL input clock (either EXTCLK
279 or XTAL/EXTAL)
wdenkc6097192002-11-03 00:24:07 +0000280
wdenk66ca92a2004-09-28 17:59:53 +0000281- 859/866/885 CPU options: (if using a MPC859 or MPC866 or MPC885 CPU):
282 CFG_8xx_CPUCLK_MIN
283 CFG_8xx_CPUCLK_MAX
284 CONFIG_8xx_CPUCLK_DEFAULT
wdenk75d1ea72004-01-31 20:06:54 +0000285 See doc/README.MPC866
286
287 CFG_MEASURE_CPUCLK
288
wdenkba56f622004-02-06 23:19:44 +0000289 Define this to measure the actual CPU clock instead
290 of relying on the correctness of the configured
291 values. Mostly useful for board bringup to make sure
292 the PLL is locked at the intended frequency. Note
293 that this requires a (stable) reference clock (32 kHz
wdenk66ca92a2004-09-28 17:59:53 +0000294 RTC clock or CFG_8XX_XIN)
wdenk75d1ea72004-01-31 20:06:54 +0000295
Markus Klotzbuecher0b953ff2006-03-24 15:28:02 +0100296- Intel Monahans options:
297 CFG_MONAHANS_RUN_MODE_OSC_RATIO
298
299 Defines the Monahans run mode to oscillator
300 ratio. Valid values are 8, 16, 24, 31. The core
301 frequency is this value multiplied by 13 MHz.
302
303 CFG_MONAHANS_TURBO_RUN_MODE_RATIO
Wolfgang Denkcf48eb92006-04-16 10:51:58 +0200304
Markus Klotzbuecher0b953ff2006-03-24 15:28:02 +0100305 Defines the Monahans turbo mode to oscillator
306 ratio. Valid values are 1 (default if undefined) and
Wolfgang Denkcf48eb92006-04-16 10:51:58 +0200307 2. The core frequency as calculated above is multiplied
Markus Klotzbuecher0b953ff2006-03-24 15:28:02 +0100308 by this value.
Wolfgang Denkcf48eb92006-04-16 10:51:58 +0200309
wdenk5da627a2003-10-09 20:09:04 +0000310- Linux Kernel Interface:
wdenkc6097192002-11-03 00:24:07 +0000311 CONFIG_CLOCKS_IN_MHZ
312
313 U-Boot stores all clock information in Hz
314 internally. For binary compatibility with older Linux
315 kernels (which expect the clocks passed in the
316 bd_info data to be in MHz) the environment variable
317 "clocks_in_mhz" can be defined so that U-Boot
318 converts clock data to MHZ before passing it to the
319 Linux kernel.
wdenkc6097192002-11-03 00:24:07 +0000320 When CONFIG_CLOCKS_IN_MHZ is defined, a definition of
321 "clocks_in_mhz=1" is automatically included in the
322 default environment.
323
wdenk5da627a2003-10-09 20:09:04 +0000324 CONFIG_MEMSIZE_IN_BYTES [relevant for MIPS only]
325
326 When transfering memsize parameter to linux, some versions
327 expect it to be in bytes, others in MB.
328 Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes.
329
Gerald Van Baren213bf8c2007-03-31 12:23:51 -0400330 CONFIG_OF_LIBFDT / CONFIG_OF_FLAT_TREE
Wolfgang Denkf57f70a2005-10-13 01:45:54 +0200331
332 New kernel versions are expecting firmware settings to be
Gerald Van Baren213bf8c2007-03-31 12:23:51 -0400333 passed using flattened device trees (based on open firmware
334 concepts).
335
336 CONFIG_OF_LIBFDT
337 * New libfdt-based support
338 * Adds the "fdt" command
Kim Phillips3bb342f2007-08-10 14:34:14 -0500339 * The bootm command automatically updates the fdt
Gerald Van Baren213bf8c2007-03-31 12:23:51 -0400340
341 CONFIG_OF_FLAT_TREE
342 * Deprecated, see CONFIG_OF_LIBFDT
343 * Original ft_build.c-based support
344 * Automatically modifies the dft as part of the bootm command
345 * The environment variable "disable_of", when set,
346 disables this functionality.
Wolfgang Denkf57f70a2005-10-13 01:45:54 +0200347
Wolfgang Denkf57f70a2005-10-13 01:45:54 +0200348 OF_CPU - The proper name of the cpus node.
Kumar Galac2871f02006-01-11 13:59:02 -0600349 OF_SOC - The proper name of the soc node.
Wolfgang Denkf57f70a2005-10-13 01:45:54 +0200350 OF_TBCLK - The timebase frequency.
Kumar Galac2871f02006-01-11 13:59:02 -0600351 OF_STDOUT_PATH - The path to the console device
Wolfgang Denkf57f70a2005-10-13 01:45:54 +0200352
Kim Phillips3bb342f2007-08-10 14:34:14 -0500353 boards with QUICC Engines require OF_QE to set UCC mac addresses
354
Kumar Galae4f880e2006-01-11 13:49:31 -0600355 CONFIG_OF_HAS_BD_T
356
Gerald Van Baren213bf8c2007-03-31 12:23:51 -0400357 * CONFIG_OF_LIBFDT - enables the "fdt bd_t" command
358 * CONFIG_OF_FLAT_TREE - The resulting flat device tree
359 will have a copy of the bd_t. Space should be
360 pre-allocated in the dts for the bd_t.
Kumar Galae4f880e2006-01-11 13:49:31 -0600361
362 CONFIG_OF_HAS_UBOOT_ENV
Stefan Roese15940c92006-03-13 11:16:36 +0100363
Kim Phillips3bb342f2007-08-10 14:34:14 -0500364 * CONFIG_OF_LIBFDT - enables the "fdt env" command
Gerald Van Baren213bf8c2007-03-31 12:23:51 -0400365 * CONFIG_OF_FLAT_TREE - The resulting flat device tree
366 will have a copy of u-boot's environment variables
Kumar Galae4f880e2006-01-11 13:49:31 -0600367
Kumar Gala4e253132006-01-11 13:54:17 -0600368 CONFIG_OF_BOARD_SETUP
369
370 Board code has addition modification that it wants to make
371 to the flat device tree before handing it off to the kernel
wdenk6705d812004-08-02 23:22:59 +0000372
Matthew McClintock02677682006-06-28 10:41:37 -0500373 CONFIG_OF_BOOT_CPU
374
375 This define fills in the correct boot cpu in the boot
376 param header, the default value is zero if undefined.
377
wdenk6705d812004-08-02 23:22:59 +0000378- Serial Ports:
379 CFG_PL010_SERIAL
380
381 Define this if you want support for Amba PrimeCell PL010 UARTs.
382
383 CFG_PL011_SERIAL
384
385 Define this if you want support for Amba PrimeCell PL011 UARTs.
386
387 CONFIG_PL011_CLOCK
388
389 If you have Amba PrimeCell PL011 UARTs, set this variable to
390 the clock speed of the UARTs.
391
392 CONFIG_PL01x_PORTS
393
394 If you have Amba PrimeCell PL010 or PL011 UARTs on your board,
395 define this to a list of base addresses for each (supported)
396 port. See e.g. include/configs/versatile.h
397
398
wdenkc6097192002-11-03 00:24:07 +0000399- Console Interface:
wdenk43d96162003-03-06 00:02:04 +0000400 Depending on board, define exactly one serial port
401 (like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2,
402 CONFIG_8xx_CONS_SCC1, ...), or switch off the serial
403 console by defining CONFIG_8xx_CONS_NONE
wdenkc6097192002-11-03 00:24:07 +0000404
405 Note: if CONFIG_8xx_CONS_NONE is defined, the serial
406 port routines must be defined elsewhere
407 (i.e. serial_init(), serial_getc(), ...)
408
409 CONFIG_CFB_CONSOLE
410 Enables console device for a color framebuffer. Needs following
411 defines (cf. smiLynxEM, i8042, board/eltec/bab7xx)
412 VIDEO_FB_LITTLE_ENDIAN graphic memory organisation
413 (default big endian)
414 VIDEO_HW_RECTFILL graphic chip supports
415 rectangle fill
416 (cf. smiLynxEM)
417 VIDEO_HW_BITBLT graphic chip supports
418 bit-blit (cf. smiLynxEM)
419 VIDEO_VISIBLE_COLS visible pixel columns
420 (cols=pitch)
wdenkba56f622004-02-06 23:19:44 +0000421 VIDEO_VISIBLE_ROWS visible pixel rows
422 VIDEO_PIXEL_SIZE bytes per pixel
wdenkc6097192002-11-03 00:24:07 +0000423 VIDEO_DATA_FORMAT graphic data format
424 (0-5, cf. cfb_console.c)
wdenkba56f622004-02-06 23:19:44 +0000425 VIDEO_FB_ADRS framebuffer address
wdenkc6097192002-11-03 00:24:07 +0000426 VIDEO_KBD_INIT_FCT keyboard int fct
427 (i.e. i8042_kbd_init())
428 VIDEO_TSTC_FCT test char fct
429 (i.e. i8042_tstc)
430 VIDEO_GETC_FCT get char fct
431 (i.e. i8042_getc)
432 CONFIG_CONSOLE_CURSOR cursor drawing on/off
433 (requires blink timer
434 cf. i8042.c)
435 CFG_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c)
436 CONFIG_CONSOLE_TIME display time/date info in
437 upper right corner
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500438 (requires CONFIG_CMD_DATE)
wdenkc6097192002-11-03 00:24:07 +0000439 CONFIG_VIDEO_LOGO display Linux logo in
440 upper left corner
wdenka6c7ad22002-12-03 21:28:10 +0000441 CONFIG_VIDEO_BMP_LOGO use bmp_logo.h instead of
442 linux_logo.h for logo.
443 Requires CONFIG_VIDEO_LOGO
wdenkc6097192002-11-03 00:24:07 +0000444 CONFIG_CONSOLE_EXTRA_INFO
445 addional board info beside
446 the logo
447
wdenk43d96162003-03-06 00:02:04 +0000448 When CONFIG_CFB_CONSOLE is defined, video console is
449 default i/o. Serial console can be forced with
450 environment 'console=serial'.
wdenkc6097192002-11-03 00:24:07 +0000451
wdenkd4ca31c2004-01-02 14:00:00 +0000452 When CONFIG_SILENT_CONSOLE is defined, all console
453 messages (by U-Boot and Linux!) can be silenced with
454 the "silent" environment variable. See
455 doc/README.silent for more information.
wdenka3ad8e22003-10-19 23:22:11 +0000456
wdenkc6097192002-11-03 00:24:07 +0000457- Console Baudrate:
458 CONFIG_BAUDRATE - in bps
459 Select one of the baudrates listed in
460 CFG_BAUDRATE_TABLE, see below.
wdenk3bbc8992003-12-07 22:27:15 +0000461 CFG_BRGCLK_PRESCALE, baudrate prescale
wdenkc6097192002-11-03 00:24:07 +0000462
463- Interrupt driven serial port input:
464 CONFIG_SERIAL_SOFTWARE_FIFO
465
466 PPC405GP only.
467 Use an interrupt handler for receiving data on the
468 serial port. It also enables using hardware handshake
469 (RTS/CTS) and UART's built-in FIFO. Set the number of
470 bytes the interrupt driven input buffer should have.
471
wdenk109c0e32004-03-23 21:43:07 +0000472 Leave undefined to disable this feature, including
473 disable the buffer and hardware handshake.
wdenkc6097192002-11-03 00:24:07 +0000474
stroese1d49b1f2003-05-23 11:39:05 +0000475- Console UART Number:
476 CONFIG_UART1_CONSOLE
477
Wolfgang Denk0c8721a2005-09-23 11:05:55 +0200478 AMCC PPC4xx only.
stroese1d49b1f2003-05-23 11:39:05 +0000479 If defined internal UART1 (and not UART0) is used
480 as default U-Boot console.
481
wdenkc6097192002-11-03 00:24:07 +0000482- Boot Delay: CONFIG_BOOTDELAY - in seconds
483 Delay before automatically booting the default image;
484 set to -1 to disable autoboot.
485
486 See doc/README.autoboot for these options that
487 work with CONFIG_BOOTDELAY. None are required.
488 CONFIG_BOOT_RETRY_TIME
489 CONFIG_BOOT_RETRY_MIN
490 CONFIG_AUTOBOOT_KEYED
491 CONFIG_AUTOBOOT_PROMPT
492 CONFIG_AUTOBOOT_DELAY_STR
493 CONFIG_AUTOBOOT_STOP_STR
494 CONFIG_AUTOBOOT_DELAY_STR2
495 CONFIG_AUTOBOOT_STOP_STR2
496 CONFIG_ZERO_BOOTDELAY_CHECK
497 CONFIG_RESET_TO_RETRY
498
499- Autoboot Command:
500 CONFIG_BOOTCOMMAND
501 Only needed when CONFIG_BOOTDELAY is enabled;
502 define a command string that is automatically executed
503 when no character is read on the console interface
504 within "Boot Delay" after reset.
505
506 CONFIG_BOOTARGS
wdenk43d96162003-03-06 00:02:04 +0000507 This can be used to pass arguments to the bootm
508 command. The value of CONFIG_BOOTARGS goes into the
509 environment value "bootargs".
wdenkc6097192002-11-03 00:24:07 +0000510
511 CONFIG_RAMBOOT and CONFIG_NFSBOOT
wdenk43d96162003-03-06 00:02:04 +0000512 The value of these goes into the environment as
513 "ramboot" and "nfsboot" respectively, and can be used
514 as a convenience, when switching between booting from
515 ram and nfs.
wdenkc6097192002-11-03 00:24:07 +0000516
517- Pre-Boot Commands:
518 CONFIG_PREBOOT
519
520 When this option is #defined, the existence of the
521 environment variable "preboot" will be checked
522 immediately before starting the CONFIG_BOOTDELAY
523 countdown and/or running the auto-boot command resp.
524 entering interactive mode.
525
526 This feature is especially useful when "preboot" is
527 automatically generated or modified. For an example
528 see the LWMON board specific code: here "preboot" is
529 modified when the user holds down a certain
530 combination of keys on the (special) keyboard when
531 booting the systems
532
533- Serial Download Echo Mode:
534 CONFIG_LOADS_ECHO
535 If defined to 1, all characters received during a
536 serial download (using the "loads" command) are
537 echoed back. This might be needed by some terminal
538 emulations (like "cu"), but may as well just take
539 time on others. This setting #define's the initial
540 value of the "loads_echo" environment variable.
541
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500542- Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined)
wdenkc6097192002-11-03 00:24:07 +0000543 CONFIG_KGDB_BAUDRATE
544 Select one of the baudrates listed in
545 CFG_BAUDRATE_TABLE, see below.
546
547- Monitor Functions:
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500548 Monitor commands can be included or excluded
549 from the build by using the #include files
550 "config_cmd_all.h" and #undef'ing unwanted
551 commands, or using "config_cmd_default.h"
552 and augmenting with additional #define's
553 for wanted commands.
wdenkc6097192002-11-03 00:24:07 +0000554
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500555 The default command configuration includes all commands
556 except those marked below with a "*".
wdenkc6097192002-11-03 00:24:07 +0000557
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500558 CONFIG_CMD_ASKENV * ask for env variable
559 CONFIG_CMD_AUTOSCRIPT Autoscript Support
560 CONFIG_CMD_BDI bdinfo
561 CONFIG_CMD_BEDBUG * Include BedBug Debugger
562 CONFIG_CMD_BMP * BMP support
563 CONFIG_CMD_BSP * Board specific commands
564 CONFIG_CMD_BOOTD bootd
565 CONFIG_CMD_CACHE * icache, dcache
566 CONFIG_CMD_CONSOLE coninfo
567 CONFIG_CMD_DATE * support for RTC, date/time...
568 CONFIG_CMD_DHCP * DHCP support
569 CONFIG_CMD_DIAG * Diagnostics
570 CONFIG_CMD_DOC * Disk-On-Chip Support
571 CONFIG_CMD_DTT * Digital Therm and Thermostat
572 CONFIG_CMD_ECHO echo arguments
573 CONFIG_CMD_EEPROM * EEPROM read/write support
574 CONFIG_CMD_ELF * bootelf, bootvx
575 CONFIG_CMD_ENV saveenv
576 CONFIG_CMD_FDC * Floppy Disk Support
577 CONFIG_CMD_FAT * FAT partition support
578 CONFIG_CMD_FDOS * Dos diskette Support
579 CONFIG_CMD_FLASH flinfo, erase, protect
580 CONFIG_CMD_FPGA FPGA device initialization support
581 CONFIG_CMD_HWFLOW * RTS/CTS hw flow control
582 CONFIG_CMD_I2C * I2C serial bus support
583 CONFIG_CMD_IDE * IDE harddisk support
584 CONFIG_CMD_IMI iminfo
585 CONFIG_CMD_IMLS List all found images
586 CONFIG_CMD_IMMAP * IMMR dump support
587 CONFIG_CMD_IRQ * irqinfo
588 CONFIG_CMD_ITEST Integer/string test of 2 values
589 CONFIG_CMD_JFFS2 * JFFS2 Support
590 CONFIG_CMD_KGDB * kgdb
591 CONFIG_CMD_LOADB loadb
592 CONFIG_CMD_LOADS loads
593 CONFIG_CMD_MEMORY md, mm, nm, mw, cp, cmp, crc, base,
594 loop, loopw, mtest
595 CONFIG_CMD_MISC Misc functions like sleep etc
596 CONFIG_CMD_MMC * MMC memory mapped support
597 CONFIG_CMD_MII * MII utility commands
598 CONFIG_CMD_NAND * NAND support
599 CONFIG_CMD_NET bootp, tftpboot, rarpboot
600 CONFIG_CMD_PCI * pciinfo
601 CONFIG_CMD_PCMCIA * PCMCIA support
602 CONFIG_CMD_PING * send ICMP ECHO_REQUEST to network
603 host
604 CONFIG_CMD_PORTIO * Port I/O
605 CONFIG_CMD_REGINFO * Register dump
606 CONFIG_CMD_RUN run command in env variable
607 CONFIG_CMD_SAVES * save S record dump
608 CONFIG_CMD_SCSI * SCSI Support
609 CONFIG_CMD_SDRAM * print SDRAM configuration information
610 (requires CONFIG_CMD_I2C)
611 CONFIG_CMD_SETGETDCR Support for DCR Register access
612 (4xx only)
613 CONFIG_CMD_SPI * SPI serial bus support
614 CONFIG_CMD_USB * USB support
615 CONFIG_CMD_VFD * VFD support (TRAB)
616 CONFIG_CMD_BSP * Board SPecific functions
617 CONFIG_CMD_CDP * Cisco Discover Protocol support
618 CONFIG_CMD_FSL * Microblaze FSL support
wdenkc6097192002-11-03 00:24:07 +0000619
wdenkc6097192002-11-03 00:24:07 +0000620
621 EXAMPLE: If you want all functions except of network
622 support you can write:
623
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500624 #include "config_cmd_all.h"
625 #undef CONFIG_CMD_NET
wdenkc6097192002-11-03 00:24:07 +0000626
Gerald Van Baren213bf8c2007-03-31 12:23:51 -0400627 Other Commands:
628 fdt (flattened device tree) command: CONFIG_OF_LIBFDT
wdenkc6097192002-11-03 00:24:07 +0000629
630 Note: Don't enable the "icache" and "dcache" commands
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500631 (configuration option CONFIG_CMD_CACHE) unless you know
wdenk43d96162003-03-06 00:02:04 +0000632 what you (and your U-Boot users) are doing. Data
633 cache cannot be enabled on systems like the 8xx or
634 8260 (where accesses to the IMMR region must be
635 uncached), and it cannot be disabled on all other
636 systems where we (mis-) use the data cache to hold an
637 initial stack and some data.
wdenkc6097192002-11-03 00:24:07 +0000638
639
640 XXX - this list needs to get updated!
641
642- Watchdog:
643 CONFIG_WATCHDOG
644 If this variable is defined, it enables watchdog
wdenk7152b1d2003-09-05 23:19:14 +0000645 support. There must be support in the platform specific
wdenkc6097192002-11-03 00:24:07 +0000646 code for a watchdog. For the 8xx and 8260 CPUs, the
647 SIU Watchdog feature is enabled in the SYPCR
648 register.
649
stroesec1551ea2003-04-04 15:53:41 +0000650- U-Boot Version:
651 CONFIG_VERSION_VARIABLE
652 If this variable is defined, an environment variable
653 named "ver" is created by U-Boot showing the U-Boot
654 version as printed by the "version" command.
655 This variable is readonly.
656
wdenkc6097192002-11-03 00:24:07 +0000657- Real-Time Clock:
658
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500659 When CONFIG_CMD_DATE is selected, the type of the RTC
wdenkc6097192002-11-03 00:24:07 +0000660 has to be selected, too. Define exactly one of the
661 following options:
662
663 CONFIG_RTC_MPC8xx - use internal RTC of MPC8xx
664 CONFIG_RTC_PCF8563 - use Philips PCF8563 RTC
665 CONFIG_RTC_MC146818 - use MC146818 RTC
wdenk1cb8e982003-03-06 21:55:29 +0000666 CONFIG_RTC_DS1307 - use Maxim, Inc. DS1307 RTC
wdenkc6097192002-11-03 00:24:07 +0000667 CONFIG_RTC_DS1337 - use Maxim, Inc. DS1337 RTC
wdenk7f70e852003-05-20 14:25:27 +0000668 CONFIG_RTC_DS1338 - use Maxim, Inc. DS1338 RTC
wdenk3bac3512003-03-12 10:41:04 +0000669 CONFIG_RTC_DS164x - use Dallas DS164x RTC
wdenk4c0d4c32004-06-09 17:34:58 +0000670 CONFIG_RTC_MAX6900 - use Maxim, Inc. MAX6900 RTC
wdenkc6097192002-11-03 00:24:07 +0000671
wdenkb37c7e52003-06-30 16:24:52 +0000672 Note that if the RTC uses I2C, then the I2C interface
673 must also be configured. See I2C Support, below.
674
wdenkc6097192002-11-03 00:24:07 +0000675- Timestamp Support:
676
wdenk43d96162003-03-06 00:02:04 +0000677 When CONFIG_TIMESTAMP is selected, the timestamp
678 (date and time) of an image is printed by image
679 commands like bootm or iminfo. This option is
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500680 automatically enabled when you select CONFIG_CMD_DATE .
wdenkc6097192002-11-03 00:24:07 +0000681
682- Partition Support:
683 CONFIG_MAC_PARTITION and/or CONFIG_DOS_PARTITION
684 and/or CONFIG_ISO_PARTITION
685
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500686 If IDE or SCSI support is enabled (CONFIG_CMD_IDE or
687 CONFIG_CMD_SCSI) you must configure support for at least
wdenkc6097192002-11-03 00:24:07 +0000688 one partition type as well.
689
690- IDE Reset method:
wdenk4d13cba2004-03-14 14:09:05 +0000691 CONFIG_IDE_RESET_ROUTINE - this is defined in several
692 board configurations files but used nowhere!
wdenkc6097192002-11-03 00:24:07 +0000693
wdenk4d13cba2004-03-14 14:09:05 +0000694 CONFIG_IDE_RESET - is this is defined, IDE Reset will
695 be performed by calling the function
696 ide_set_reset(int reset)
697 which has to be defined in a board specific file
wdenkc6097192002-11-03 00:24:07 +0000698
699- ATAPI Support:
700 CONFIG_ATAPI
701
702 Set this to enable ATAPI support.
703
wdenkc40b2952004-03-13 23:29:43 +0000704- LBA48 Support
705 CONFIG_LBA48
706
707 Set this to enable support for disks larger than 137GB
708 Also look at CFG_64BIT_LBA ,CFG_64BIT_VSPRINTF and CFG_64BIT_STRTOUL
709 Whithout these , LBA48 support uses 32bit variables and will 'only'
710 support disks up to 2.1TB.
711
712 CFG_64BIT_LBA:
713 When enabled, makes the IDE subsystem use 64bit sector addresses.
714 Default is 32bit.
715
wdenkc6097192002-11-03 00:24:07 +0000716- SCSI Support:
717 At the moment only there is only support for the
718 SYM53C8XX SCSI controller; define
719 CONFIG_SCSI_SYM53C8XX to enable it.
720
721 CFG_SCSI_MAX_LUN [8], CFG_SCSI_MAX_SCSI_ID [7] and
722 CFG_SCSI_MAX_DEVICE [CFG_SCSI_MAX_SCSI_ID *
723 CFG_SCSI_MAX_LUN] can be adjusted to define the
724 maximum numbers of LUNs, SCSI ID's and target
725 devices.
726 CFG_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz)
727
728- NETWORK Support (PCI):
wdenk682011f2003-06-03 23:54:09 +0000729 CONFIG_E1000
730 Support for Intel 8254x gigabit chips.
stroese53cf9432003-06-05 15:39:44 +0000731
wdenkc6097192002-11-03 00:24:07 +0000732 CONFIG_EEPRO100
733 Support for Intel 82557/82559/82559ER chips.
734 Optional CONFIG_EEPRO100_SROM_WRITE enables eeprom
735 write routine for first time initialisation.
736
737 CONFIG_TULIP
738 Support for Digital 2114x chips.
739 Optional CONFIG_TULIP_SELECT_MEDIA for board specific
740 modem chip initialisation (KS8761/QS6611).
741
742 CONFIG_NATSEMI
743 Support for National dp83815 chips.
744
745 CONFIG_NS8382X
746 Support for National dp8382[01] gigabit chips.
747
wdenk45219c42003-05-12 21:50:16 +0000748- NETWORK Support (other):
749
750 CONFIG_DRIVER_LAN91C96
751 Support for SMSC's LAN91C96 chips.
752
753 CONFIG_LAN91C96_BASE
754 Define this to hold the physical address
755 of the LAN91C96's I/O space
756
757 CONFIG_LAN91C96_USE_32_BIT
758 Define this to enable 32 bit addressing
759
wdenkf39748a2004-06-09 13:37:52 +0000760 CONFIG_DRIVER_SMC91111
761 Support for SMSC's LAN91C111 chip
762
763 CONFIG_SMC91111_BASE
764 Define this to hold the physical address
765 of the device (I/O space)
766
767 CONFIG_SMC_USE_32_BIT
768 Define this if data bus is 32 bits
769
770 CONFIG_SMC_USE_IOFUNCS
771 Define this to use i/o functions instead of macros
772 (some hardware wont work with macros)
773
wdenkc6097192002-11-03 00:24:07 +0000774- USB Support:
775 At the moment only the UHCI host controller is
wdenk4d13cba2004-03-14 14:09:05 +0000776 supported (PIP405, MIP405, MPC5200); define
wdenkc6097192002-11-03 00:24:07 +0000777 CONFIG_USB_UHCI to enable it.
778 define CONFIG_USB_KEYBOARD to enable the USB Keyboard
wdenk30d56fa2004-10-09 22:44:59 +0000779 and define CONFIG_USB_STORAGE to enable the USB
wdenkc6097192002-11-03 00:24:07 +0000780 storage devices.
781 Note:
782 Supported are USB Keyboards and USB Floppy drives
783 (TEAC FD-05PUB).
wdenk4d13cba2004-03-14 14:09:05 +0000784 MPC5200 USB requires additional defines:
785 CONFIG_USB_CLOCK
786 for 528 MHz Clock: 0x0001bbbb
787 CONFIG_USB_CONFIG
788 for differential drivers: 0x00001000
789 for single ended drivers: 0x00005000
Zhang Weifdcfaa12007-06-06 10:08:13 +0200790 CFG_USB_EVENT_POLL
791 May be defined to allow interrupt polling
792 instead of using asynchronous interrupts
wdenk4d13cba2004-03-14 14:09:05 +0000793
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200794- USB Device:
795 Define the below if you wish to use the USB console.
796 Once firmware is rebuilt from a serial console issue the
797 command "setenv stdin usbtty; setenv stdout usbtty" and
798 attach your usb cable. The Unix command "dmesg" should print
799 it has found a new device. The environment variable usbtty
800 can be set to gserial or cdc_acm to enable your device to
Wolfgang Denk386eda02006-06-14 18:14:56 +0200801 appear to a USB host as a Linux gserial device or a
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200802 Common Device Class Abstract Control Model serial device.
803 If you select usbtty = gserial you should be able to enumerate
804 a Linux host by
805 # modprobe usbserial vendor=0xVendorID product=0xProductID
806 else if using cdc_acm, simply setting the environment
807 variable usbtty to be cdc_acm should suffice. The following
808 might be defined in YourBoardName.h
Wolfgang Denk386eda02006-06-14 18:14:56 +0200809
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200810 CONFIG_USB_DEVICE
811 Define this to build a UDC device
wdenkc6097192002-11-03 00:24:07 +0000812
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200813 CONFIG_USB_TTY
814 Define this to have a tty type of device available to
815 talk to the UDC device
Wolfgang Denk386eda02006-06-14 18:14:56 +0200816
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200817 CFG_CONSOLE_IS_IN_ENV
818 Define this if you want stdin, stdout &/or stderr to
819 be set to usbtty.
820
821 mpc8xx:
822 CFG_USB_EXTC_CLK 0xBLAH
823 Derive USB clock from external clock "blah"
Wolfgang Denk386eda02006-06-14 18:14:56 +0200824 - CFG_USB_EXTC_CLK 0x02
825
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200826 CFG_USB_BRG_CLK 0xBLAH
827 Derive USB clock from brgclk
828 - CFG_USB_BRG_CLK 0x04
829
Wolfgang Denk386eda02006-06-14 18:14:56 +0200830 If you have a USB-IF assigned VendorID then you may wish to
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200831 define your own vendor specific values either in BoardName.h
Wolfgang Denk386eda02006-06-14 18:14:56 +0200832 or directly in usbd_vendor_info.h. If you don't define
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200833 CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME,
834 CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot
835 should pretend to be a Linux device to it's target host.
836
837 CONFIG_USBD_MANUFACTURER
838 Define this string as the name of your company for
839 - CONFIG_USBD_MANUFACTURER "my company"
Wolfgang Denk386eda02006-06-14 18:14:56 +0200840
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200841 CONFIG_USBD_PRODUCT_NAME
842 Define this string as the name of your product
843 - CONFIG_USBD_PRODUCT_NAME "acme usb device"
844
845 CONFIG_USBD_VENDORID
846 Define this as your assigned Vendor ID from the USB
847 Implementors Forum. This *must* be a genuine Vendor ID
848 to avoid polluting the USB namespace.
849 - CONFIG_USBD_VENDORID 0xFFFF
Wolfgang Denk386eda02006-06-14 18:14:56 +0200850
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200851 CONFIG_USBD_PRODUCTID
852 Define this as the unique Product ID
853 for your device
854 - CONFIG_USBD_PRODUCTID 0xFFFF
wdenkc6097192002-11-03 00:24:07 +0000855
856
857- MMC Support:
858 The MMC controller on the Intel PXA is supported. To
859 enable this define CONFIG_MMC. The MMC can be
860 accessed from the boot prompt by mapping the device
861 to physical memory similar to flash. Command line is
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500862 enabled with CONFIG_CMD_MMC. The MMC driver also works with
863 the FAT fs. This is enabled with CONFIG_CMD_FAT.
wdenkc6097192002-11-03 00:24:07 +0000864
wdenk6705d812004-08-02 23:22:59 +0000865- Journaling Flash filesystem support:
866 CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE,
867 CONFIG_JFFS2_NAND_DEV
868 Define these for a default partition on a NAND device
869
870 CFG_JFFS2_FIRST_SECTOR,
871 CFG_JFFS2_FIRST_BANK, CFG_JFFS2_NUM_BANKS
872 Define these for a default partition on a NOR device
873
874 CFG_JFFS_CUSTOM_PART
875 Define this to create an own partition. You have to provide a
876 function struct part_info* jffs2_part_info(int part_num)
877
878 If you define only one JFFS2 partition you may also want to
wdenkefe2a4d2004-12-16 21:44:03 +0000879 #define CFG_JFFS_SINGLE_PART 1
wdenk6705d812004-08-02 23:22:59 +0000880 to disable the command chpart. This is the default when you
881 have not defined a custom partition
882
wdenkc6097192002-11-03 00:24:07 +0000883- Keyboard Support:
884 CONFIG_ISA_KEYBOARD
885
886 Define this to enable standard (PC-Style) keyboard
887 support
888
889 CONFIG_I8042_KBD
890 Standard PC keyboard driver with US (is default) and
891 GERMAN key layout (switch via environment 'keymap=de') support.
892 Export function i8042_kbd_init, i8042_tstc and i8042_getc
893 for cfb_console. Supports cursor blinking.
894
895- Video support:
896 CONFIG_VIDEO
897
898 Define this to enable video support (for output to
899 video).
900
901 CONFIG_VIDEO_CT69000
902
903 Enable Chips & Technologies 69000 Video chip
904
905 CONFIG_VIDEO_SMI_LYNXEM
wdenkb79a11c2004-03-25 15:14:43 +0000906 Enable Silicon Motion SMI 712/710/810 Video chip. The
wdenkeeb1b772004-03-23 22:53:55 +0000907 video output is selected via environment 'videoout'
908 (1 = LCD and 2 = CRT). If videoout is undefined, CRT is
909 assumed.
wdenkc6097192002-11-03 00:24:07 +0000910
wdenkb79a11c2004-03-25 15:14:43 +0000911 For the CT69000 and SMI_LYNXEM drivers, videomode is
912 selected via environment 'videomode'. Two diferent ways
wdenkeeb1b772004-03-23 22:53:55 +0000913 are possible:
914 - "videomode=num" 'num' is a standard LiLo mode numbers.
wdenk6e592382004-04-18 17:39:38 +0000915 Following standard modes are supported (* is default):
wdenkeeb1b772004-03-23 22:53:55 +0000916
917 Colors 640x480 800x600 1024x768 1152x864 1280x1024
918 -------------+---------------------------------------------
919 8 bits | 0x301* 0x303 0x305 0x161 0x307
920 15 bits | 0x310 0x313 0x316 0x162 0x319
921 16 bits | 0x311 0x314 0x317 0x163 0x31A
922 24 bits | 0x312 0x315 0x318 ? 0x31B
923 -------------+---------------------------------------------
wdenkc6097192002-11-03 00:24:07 +0000924 (i.e. setenv videomode 317; saveenv; reset;)
925
wdenkb79a11c2004-03-25 15:14:43 +0000926 - "videomode=bootargs" all the video parameters are parsed
Marcel Ziswiler7817cb22007-12-30 03:30:46 +0100927 from the bootargs. (See drivers/video/videomodes.c)
wdenkeeb1b772004-03-23 22:53:55 +0000928
929
stroesec1551ea2003-04-04 15:53:41 +0000930 CONFIG_VIDEO_SED13806
wdenk43d96162003-03-06 00:02:04 +0000931 Enable Epson SED13806 driver. This driver supports 8bpp
wdenka6c7ad22002-12-03 21:28:10 +0000932 and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP
933 or CONFIG_VIDEO_SED13806_16BPP
934
wdenk682011f2003-06-03 23:54:09 +0000935- Keyboard Support:
wdenk8bde7f72003-06-27 21:31:46 +0000936 CONFIG_KEYBOARD
wdenk682011f2003-06-03 23:54:09 +0000937
wdenk8bde7f72003-06-27 21:31:46 +0000938 Define this to enable a custom keyboard support.
939 This simply calls drv_keyboard_init() which must be
940 defined in your board-specific files.
941 The only board using this so far is RBC823.
wdenka6c7ad22002-12-03 21:28:10 +0000942
wdenkc6097192002-11-03 00:24:07 +0000943- LCD Support: CONFIG_LCD
944
945 Define this to enable LCD support (for output to LCD
946 display); also select one of the supported displays
947 by defining one of these:
948
wdenkfd3103b2003-11-25 16:55:19 +0000949 CONFIG_NEC_NL6448AC33:
wdenkc6097192002-11-03 00:24:07 +0000950
wdenkfd3103b2003-11-25 16:55:19 +0000951 NEC NL6448AC33-18. Active, color, single scan.
wdenkc6097192002-11-03 00:24:07 +0000952
wdenkfd3103b2003-11-25 16:55:19 +0000953 CONFIG_NEC_NL6448BC20
wdenkc6097192002-11-03 00:24:07 +0000954
wdenkfd3103b2003-11-25 16:55:19 +0000955 NEC NL6448BC20-08. 6.5", 640x480.
956 Active, color, single scan.
957
958 CONFIG_NEC_NL6448BC33_54
959
960 NEC NL6448BC33-54. 10.4", 640x480.
wdenkc6097192002-11-03 00:24:07 +0000961 Active, color, single scan.
962
963 CONFIG_SHARP_16x9
964
965 Sharp 320x240. Active, color, single scan.
966 It isn't 16x9, and I am not sure what it is.
967
968 CONFIG_SHARP_LQ64D341
969
970 Sharp LQ64D341 display, 640x480.
971 Active, color, single scan.
972
973 CONFIG_HLD1045
974
975 HLD1045 display, 640x480.
976 Active, color, single scan.
977
978 CONFIG_OPTREX_BW
979
980 Optrex CBL50840-2 NF-FW 99 22 M5
981 or
982 Hitachi LMG6912RPFC-00T
983 or
984 Hitachi SP14Q002
985
986 320x240. Black & white.
987
988 Normally display is black on white background; define
989 CFG_WHITE_ON_BLACK to get it inverted.
990
wdenk7152b1d2003-09-05 23:19:14 +0000991- Splash Screen Support: CONFIG_SPLASH_SCREEN
wdenkd791b1d2003-04-20 14:04:18 +0000992
wdenk8bde7f72003-06-27 21:31:46 +0000993 If this option is set, the environment is checked for
994 a variable "splashimage". If found, the usual display
995 of logo, copyright and system information on the LCD
wdenke94d2cd2004-06-30 22:59:18 +0000996 is suppressed and the BMP image at the address
wdenk8bde7f72003-06-27 21:31:46 +0000997 specified in "splashimage" is loaded instead. The
998 console is redirected to the "nulldev", too. This
999 allows for a "silent" boot where a splash screen is
1000 loaded very quickly after power-on.
wdenkd791b1d2003-04-20 14:04:18 +00001001
Stefan Roese98f4a3d2005-09-22 09:04:17 +02001002- Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP
1003
1004 If this option is set, additionally to standard BMP
1005 images, gzipped BMP images can be displayed via the
1006 splashscreen support or the bmp command.
1007
wdenkc29fdfc2003-08-29 20:57:53 +00001008- Compression support:
1009 CONFIG_BZIP2
1010
1011 If this option is set, support for bzip2 compressed
1012 images is included. If not, only uncompressed and gzip
1013 compressed images are supported.
1014
wdenk42d1f032003-10-15 23:53:47 +00001015 NOTE: the bzip2 algorithm requires a lot of RAM, so
1016 the malloc area (as defined by CFG_MALLOC_LEN) should
1017 be at least 4MB.
wdenkd791b1d2003-04-20 14:04:18 +00001018
wdenk17ea1172004-06-06 21:51:03 +00001019- MII/PHY support:
1020 CONFIG_PHY_ADDR
1021
1022 The address of PHY on MII bus.
1023
1024 CONFIG_PHY_CLOCK_FREQ (ppc4xx)
1025
1026 The clock frequency of the MII bus
1027
1028 CONFIG_PHY_GIGE
1029
1030 If this option is set, support for speed/duplex
1031 detection of Gigabit PHY is included.
1032
1033 CONFIG_PHY_RESET_DELAY
1034
1035 Some PHY like Intel LXT971A need extra delay after
1036 reset before any MII register access is possible.
1037 For such PHY, set this option to the usec delay
1038 required. (minimum 300usec for LXT971A)
1039
1040 CONFIG_PHY_CMD_DELAY (ppc4xx)
1041
1042 Some PHY like Intel LXT971A need extra delay after
1043 command issued before MII status register can be read
1044
wdenkc6097192002-11-03 00:24:07 +00001045- Ethernet address:
1046 CONFIG_ETHADDR
1047 CONFIG_ETH2ADDR
1048 CONFIG_ETH3ADDR
1049
1050 Define a default value for ethernet address to use
1051 for the respective ethernet interface, in case this
1052 is not determined automatically.
1053
1054- IP address:
1055 CONFIG_IPADDR
1056
1057 Define a default value for the IP address to use for
1058 the default ethernet interface, in case this is not
1059 determined through e.g. bootp.
1060
1061- Server IP address:
1062 CONFIG_SERVERIP
1063
1064 Defines a default value for theIP address of a TFTP
1065 server to contact when using the "tftboot" command.
1066
David Updegraff53a5c422007-06-11 10:41:07 -05001067- Multicast TFTP Mode:
1068 CONFIG_MCAST_TFTP
1069
1070 Defines whether you want to support multicast TFTP as per
1071 rfc-2090; for example to work with atftp. Lets lots of targets
1072 tftp down the same boot image concurrently. Note: the ethernet
1073 driver in use must provide a function: mcast() to join/leave a
1074 multicast group.
1075
1076 CONFIG_BOOTP_RANDOM_DELAY
wdenkc6097192002-11-03 00:24:07 +00001077- BOOTP Recovery Mode:
1078 CONFIG_BOOTP_RANDOM_DELAY
1079
1080 If you have many targets in a network that try to
1081 boot using BOOTP, you may want to avoid that all
1082 systems send out BOOTP requests at precisely the same
1083 moment (which would happen for instance at recovery
1084 from a power failure, when all systems will try to
1085 boot, thus flooding the BOOTP server. Defining
1086 CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be
1087 inserted before sending out BOOTP requests. The
Wolfgang Denk6c33c782007-08-06 23:21:05 +02001088 following delays are inserted then:
wdenkc6097192002-11-03 00:24:07 +00001089
1090 1st BOOTP request: delay 0 ... 1 sec
1091 2nd BOOTP request: delay 0 ... 2 sec
1092 3rd BOOTP request: delay 0 ... 4 sec
1093 4th and following
1094 BOOTP requests: delay 0 ... 8 sec
1095
stroesefe389a82003-08-28 14:17:32 +00001096- DHCP Advanced Options:
Jon Loeliger1fe80d72007-07-09 22:08:34 -05001097 You can fine tune the DHCP functionality by defining
1098 CONFIG_BOOTP_* symbols:
stroesefe389a82003-08-28 14:17:32 +00001099
Jon Loeliger1fe80d72007-07-09 22:08:34 -05001100 CONFIG_BOOTP_SUBNETMASK
1101 CONFIG_BOOTP_GATEWAY
1102 CONFIG_BOOTP_HOSTNAME
1103 CONFIG_BOOTP_NISDOMAIN
1104 CONFIG_BOOTP_BOOTPATH
1105 CONFIG_BOOTP_BOOTFILESIZE
1106 CONFIG_BOOTP_DNS
1107 CONFIG_BOOTP_DNS2
1108 CONFIG_BOOTP_SEND_HOSTNAME
1109 CONFIG_BOOTP_NTPSERVER
1110 CONFIG_BOOTP_TIMEOFFSET
1111 CONFIG_BOOTP_VENDOREX
stroesefe389a82003-08-28 14:17:32 +00001112
Wilson Callan5d110f02007-07-28 10:56:13 -04001113 CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip
1114 environment variable, not the BOOTP server.
stroesefe389a82003-08-28 14:17:32 +00001115
1116 CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS
1117 serverip from a DHCP server, it is possible that more
1118 than one DNS serverip is offered to the client.
1119 If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS
1120 serverip will be stored in the additional environment
1121 variable "dnsip2". The first DNS serverip is always
1122 stored in the variable "dnsip", when CONFIG_BOOTP_DNS
Jon Loeliger1fe80d72007-07-09 22:08:34 -05001123 is defined.
stroesefe389a82003-08-28 14:17:32 +00001124
1125 CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable
1126 to do a dynamic update of a DNS server. To do this, they
1127 need the hostname of the DHCP requester.
Wilson Callan5d110f02007-07-28 10:56:13 -04001128 If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content
Jon Loeliger1fe80d72007-07-09 22:08:34 -05001129 of the "hostname" environment variable is passed as
1130 option 12 to the DHCP server.
stroesefe389a82003-08-28 14:17:32 +00001131
wdenka3d991b2004-04-15 21:48:45 +00001132 - CDP Options:
wdenk6e592382004-04-18 17:39:38 +00001133 CONFIG_CDP_DEVICE_ID
wdenka3d991b2004-04-15 21:48:45 +00001134
1135 The device id used in CDP trigger frames.
1136
1137 CONFIG_CDP_DEVICE_ID_PREFIX
1138
1139 A two character string which is prefixed to the MAC address
1140 of the device.
1141
1142 CONFIG_CDP_PORT_ID
1143
1144 A printf format string which contains the ascii name of
1145 the port. Normally is set to "eth%d" which sets
1146 eth0 for the first ethernet, eth1 for the second etc.
1147
1148 CONFIG_CDP_CAPABILITIES
1149
1150 A 32bit integer which indicates the device capabilities;
1151 0x00000010 for a normal host which does not forwards.
1152
1153 CONFIG_CDP_VERSION
1154
1155 An ascii string containing the version of the software.
1156
1157 CONFIG_CDP_PLATFORM
1158
1159 An ascii string containing the name of the platform.
1160
1161 CONFIG_CDP_TRIGGER
1162
1163 A 32bit integer sent on the trigger.
1164
1165 CONFIG_CDP_POWER_CONSUMPTION
1166
1167 A 16bit integer containing the power consumption of the
1168 device in .1 of milliwatts.
1169
1170 CONFIG_CDP_APPLIANCE_VLAN_TYPE
1171
1172 A byte containing the id of the VLAN.
1173
wdenkc6097192002-11-03 00:24:07 +00001174- Status LED: CONFIG_STATUS_LED
1175
1176 Several configurations allow to display the current
1177 status using a LED. For instance, the LED will blink
1178 fast while running U-Boot code, stop blinking as
1179 soon as a reply to a BOOTP request was received, and
1180 start blinking slow once the Linux kernel is running
1181 (supported by a status LED driver in the Linux
1182 kernel). Defining CONFIG_STATUS_LED enables this
1183 feature in U-Boot.
1184
1185- CAN Support: CONFIG_CAN_DRIVER
1186
1187 Defining CONFIG_CAN_DRIVER enables CAN driver support
1188 on those systems that support this (optional)
1189 feature, like the TQM8xxL modules.
1190
1191- I2C Support: CONFIG_HARD_I2C | CONFIG_SOFT_I2C
1192
wdenkb37c7e52003-06-30 16:24:52 +00001193 These enable I2C serial bus commands. Defining either of
wdenk945af8d2003-07-16 21:53:01 +00001194 (but not both of) CONFIG_HARD_I2C or CONFIG_SOFT_I2C will
1195 include the appropriate I2C driver for the selected cpu.
wdenkc6097192002-11-03 00:24:07 +00001196
wdenk945af8d2003-07-16 21:53:01 +00001197 This will allow you to use i2c commands at the u-boot
Jon Loeliger602ad3b2007-06-11 19:03:39 -05001198 command line (as long as you set CONFIG_CMD_I2C in
wdenkb37c7e52003-06-30 16:24:52 +00001199 CONFIG_COMMANDS) and communicate with i2c based realtime
1200 clock chips. See common/cmd_i2c.c for a description of the
wdenk43d96162003-03-06 00:02:04 +00001201 command line interface.
wdenkc6097192002-11-03 00:24:07 +00001202
Ben Warrenbb99ad62006-09-07 16:50:54 -04001203 CONFIG_I2C_CMD_TREE is a recommended option that places
1204 all I2C commands under a single 'i2c' root command. The
1205 older 'imm', 'imd', 'iprobe' etc. commands are considered
1206 deprecated and may disappear in the future.
1207
1208 CONFIG_HARD_I2C selects a hardware I2C controller.
wdenkc6097192002-11-03 00:24:07 +00001209
wdenk945af8d2003-07-16 21:53:01 +00001210 CONFIG_SOFT_I2C configures u-boot to use a software (aka
wdenkb37c7e52003-06-30 16:24:52 +00001211 bit-banging) driver instead of CPM or similar hardware
1212 support for I2C.
wdenkc6097192002-11-03 00:24:07 +00001213
wdenk945af8d2003-07-16 21:53:01 +00001214 There are several other quantities that must also be
wdenkb37c7e52003-06-30 16:24:52 +00001215 defined when you define CONFIG_HARD_I2C or CONFIG_SOFT_I2C.
wdenkc6097192002-11-03 00:24:07 +00001216
wdenkb37c7e52003-06-30 16:24:52 +00001217 In both cases you will need to define CFG_I2C_SPEED
wdenk945af8d2003-07-16 21:53:01 +00001218 to be the frequency (in Hz) at which you wish your i2c bus
1219 to run and CFG_I2C_SLAVE to be the address of this node (ie
1220 the cpu's i2c node address).
1221
wdenkb37c7e52003-06-30 16:24:52 +00001222 Now, the u-boot i2c code for the mpc8xx (cpu/mpc8xx/i2c.c)
1223 sets the cpu up as a master node and so its address should
1224 therefore be cleared to 0 (See, eg, MPC823e User's Manual
wdenk945af8d2003-07-16 21:53:01 +00001225 p.16-473). So, set CFG_I2C_SLAVE to 0.
wdenkc6097192002-11-03 00:24:07 +00001226
wdenk945af8d2003-07-16 21:53:01 +00001227 That's all that's required for CONFIG_HARD_I2C.
wdenkb37c7e52003-06-30 16:24:52 +00001228
1229 If you use the software i2c interface (CONFIG_SOFT_I2C)
1230 then the following macros need to be defined (examples are
1231 from include/configs/lwmon.h):
wdenkc6097192002-11-03 00:24:07 +00001232
1233 I2C_INIT
1234
wdenkb37c7e52003-06-30 16:24:52 +00001235 (Optional). Any commands necessary to enable the I2C
wdenk43d96162003-03-06 00:02:04 +00001236 controller or configure ports.
wdenkc6097192002-11-03 00:24:07 +00001237
wdenkba56f622004-02-06 23:19:44 +00001238 eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |= PB_SCL)
wdenkb37c7e52003-06-30 16:24:52 +00001239
wdenkc6097192002-11-03 00:24:07 +00001240 I2C_PORT
1241
wdenk43d96162003-03-06 00:02:04 +00001242 (Only for MPC8260 CPU). The I/O port to use (the code
1243 assumes both bits are on the same port). Valid values
1244 are 0..3 for ports A..D.
wdenkc6097192002-11-03 00:24:07 +00001245
1246 I2C_ACTIVE
1247
1248 The code necessary to make the I2C data line active
1249 (driven). If the data line is open collector, this
1250 define can be null.
1251
wdenkb37c7e52003-06-30 16:24:52 +00001252 eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |= PB_SDA)
1253
wdenkc6097192002-11-03 00:24:07 +00001254 I2C_TRISTATE
1255
1256 The code necessary to make the I2C data line tri-stated
1257 (inactive). If the data line is open collector, this
1258 define can be null.
1259
wdenkb37c7e52003-06-30 16:24:52 +00001260 eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA)
1261
wdenkc6097192002-11-03 00:24:07 +00001262 I2C_READ
1263
1264 Code that returns TRUE if the I2C data line is high,
1265 FALSE if it is low.
1266
wdenkb37c7e52003-06-30 16:24:52 +00001267 eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0)
1268
wdenkc6097192002-11-03 00:24:07 +00001269 I2C_SDA(bit)
1270
1271 If <bit> is TRUE, sets the I2C data line high. If it
1272 is FALSE, it clears it (low).
1273
wdenkb37c7e52003-06-30 16:24:52 +00001274 eg: #define I2C_SDA(bit) \
wdenk2535d602003-07-17 23:16:40 +00001275 if(bit) immr->im_cpm.cp_pbdat |= PB_SDA; \
wdenkba56f622004-02-06 23:19:44 +00001276 else immr->im_cpm.cp_pbdat &= ~PB_SDA
wdenkb37c7e52003-06-30 16:24:52 +00001277
wdenkc6097192002-11-03 00:24:07 +00001278 I2C_SCL(bit)
1279
1280 If <bit> is TRUE, sets the I2C clock line high. If it
1281 is FALSE, it clears it (low).
1282
wdenkb37c7e52003-06-30 16:24:52 +00001283 eg: #define I2C_SCL(bit) \
wdenk2535d602003-07-17 23:16:40 +00001284 if(bit) immr->im_cpm.cp_pbdat |= PB_SCL; \
wdenkba56f622004-02-06 23:19:44 +00001285 else immr->im_cpm.cp_pbdat &= ~PB_SCL
wdenkb37c7e52003-06-30 16:24:52 +00001286
wdenkc6097192002-11-03 00:24:07 +00001287 I2C_DELAY
1288
1289 This delay is invoked four times per clock cycle so this
1290 controls the rate of data transfer. The data rate thus
wdenkb37c7e52003-06-30 16:24:52 +00001291 is 1 / (I2C_DELAY * 4). Often defined to be something
wdenk945af8d2003-07-16 21:53:01 +00001292 like:
1293
wdenkb37c7e52003-06-30 16:24:52 +00001294 #define I2C_DELAY udelay(2)
wdenkc6097192002-11-03 00:24:07 +00001295
wdenk47cd00f2003-03-06 13:39:27 +00001296 CFG_I2C_INIT_BOARD
1297
wdenk8bde7f72003-06-27 21:31:46 +00001298 When a board is reset during an i2c bus transfer
1299 chips might think that the current transfer is still
1300 in progress. On some boards it is possible to access
1301 the i2c SCLK line directly, either by using the
1302 processor pin as a GPIO or by having a second pin
1303 connected to the bus. If this option is defined a
1304 custom i2c_init_board() routine in boards/xxx/board.c
1305 is run early in the boot sequence.
wdenk47cd00f2003-03-06 13:39:27 +00001306
wdenk17ea1172004-06-06 21:51:03 +00001307 CONFIG_I2CFAST (PPC405GP|PPC405EP only)
1308
1309 This option enables configuration of bi_iic_fast[] flags
1310 in u-boot bd_info structure based on u-boot environment
1311 variable "i2cfast". (see also i2cfast)
1312
Ben Warrenbb99ad62006-09-07 16:50:54 -04001313 CONFIG_I2C_MULTI_BUS
1314
1315 This option allows the use of multiple I2C buses, each of which
1316 must have a controller. At any point in time, only one bus is
1317 active. To switch to a different bus, use the 'i2c dev' command.
1318 Note that bus numbering is zero-based.
1319
1320 CFG_I2C_NOPROBES
1321
1322 This option specifies a list of I2C devices that will be skipped
1323 when the 'i2c probe' command is issued (or 'iprobe' using the legacy
1324 command). If CONFIG_I2C_MULTI_BUS is set, specify a list of bus-device
1325 pairs. Otherwise, specify a 1D array of device addresses
1326
1327 e.g.
1328 #undef CONFIG_I2C_MULTI_BUS
1329 #define CFG_I2C_NOPROBES {0x50,0x68}
1330
1331 will skip addresses 0x50 and 0x68 on a board with one I2C bus
1332
1333 #define CONFIG_I2C_MULTI_BUS
1334 #define CFG_I2C_MULTI_NOPROBES {{0,0x50},{0,0x68},{1,0x54}}
1335
1336 will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1
1337
Timur Tabibe5e6182006-11-03 19:15:00 -06001338 CFG_SPD_BUS_NUM
1339
1340 If defined, then this indicates the I2C bus number for DDR SPD.
1341 If not defined, then U-Boot assumes that SPD is on I2C bus 0.
1342
Stefan Roese0dc018e2007-02-20 10:51:26 +01001343 CFG_RTC_BUS_NUM
1344
1345 If defined, then this indicates the I2C bus number for the RTC.
1346 If not defined, then U-Boot assumes that RTC is on I2C bus 0.
1347
1348 CFG_DTT_BUS_NUM
1349
1350 If defined, then this indicates the I2C bus number for the DTT.
1351 If not defined, then U-Boot assumes that DTT is on I2C bus 0.
1352
Timur Tabibe5e6182006-11-03 19:15:00 -06001353 CONFIG_FSL_I2C
1354
1355 Define this option if you want to use Freescale's I2C driver in
Marcel Ziswiler7817cb22007-12-30 03:30:46 +01001356 drivers/i2c/fsl_i2c.c.
Timur Tabibe5e6182006-11-03 19:15:00 -06001357
1358
wdenkc6097192002-11-03 00:24:07 +00001359- SPI Support: CONFIG_SPI
1360
1361 Enables SPI driver (so far only tested with
1362 SPI EEPROM, also an instance works with Crystal A/D and
1363 D/As on the SACSng board)
1364
1365 CONFIG_SPI_X
1366
1367 Enables extended (16-bit) SPI EEPROM addressing.
1368 (symmetrical to CONFIG_I2C_X)
1369
1370 CONFIG_SOFT_SPI
1371
wdenk43d96162003-03-06 00:02:04 +00001372 Enables a software (bit-bang) SPI driver rather than
1373 using hardware support. This is a general purpose
1374 driver that only requires three general I/O port pins
1375 (two outputs, one input) to function. If this is
1376 defined, the board configuration must define several
1377 SPI configuration items (port pins to use, etc). For
1378 an example, see include/configs/sacsng.h.
wdenkc6097192002-11-03 00:24:07 +00001379
Matthias Fuchs01335022007-12-27 17:12:34 +01001380- FPGA Support: CONFIG_FPGA
1381
1382 Enables FPGA subsystem.
1383
1384 CONFIG_FPGA_<vendor>
1385
1386 Enables support for specific chip vendors.
1387 (ALTERA, XILINX)
1388
1389 CONFIG_FPGA_<family>
1390
1391 Enables support for FPGA family.
1392 (SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX)
1393
1394 CONFIG_FPGA_COUNT
wdenkc6097192002-11-03 00:24:07 +00001395
wdenk43d96162003-03-06 00:02:04 +00001396 Specify the number of FPGA devices to support.
wdenkc6097192002-11-03 00:24:07 +00001397
wdenk8bde7f72003-06-27 21:31:46 +00001398 CFG_FPGA_PROG_FEEDBACK
wdenkc6097192002-11-03 00:24:07 +00001399
wdenk8bde7f72003-06-27 21:31:46 +00001400 Enable printing of hash marks during FPGA configuration.
wdenkc6097192002-11-03 00:24:07 +00001401
1402 CFG_FPGA_CHECK_BUSY
1403
wdenk43d96162003-03-06 00:02:04 +00001404 Enable checks on FPGA configuration interface busy
1405 status by the configuration function. This option
1406 will require a board or device specific function to
1407 be written.
wdenkc6097192002-11-03 00:24:07 +00001408
1409 CONFIG_FPGA_DELAY
1410
1411 If defined, a function that provides delays in the FPGA
1412 configuration driver.
1413
1414 CFG_FPGA_CHECK_CTRLC
1415 Allow Control-C to interrupt FPGA configuration
1416
1417 CFG_FPGA_CHECK_ERROR
1418
wdenk43d96162003-03-06 00:02:04 +00001419 Check for configuration errors during FPGA bitfile
1420 loading. For example, abort during Virtex II
1421 configuration if the INIT_B line goes low (which
1422 indicated a CRC error).
wdenkc6097192002-11-03 00:24:07 +00001423
1424 CFG_FPGA_WAIT_INIT
1425
wdenk43d96162003-03-06 00:02:04 +00001426 Maximum time to wait for the INIT_B line to deassert
1427 after PROB_B has been deasserted during a Virtex II
1428 FPGA configuration sequence. The default time is 500
1429 mS.
wdenkc6097192002-11-03 00:24:07 +00001430
1431 CFG_FPGA_WAIT_BUSY
1432
wdenk43d96162003-03-06 00:02:04 +00001433 Maximum time to wait for BUSY to deassert during
1434 Virtex II FPGA configuration. The default is 5 mS.
wdenkc6097192002-11-03 00:24:07 +00001435
1436 CFG_FPGA_WAIT_CONFIG
1437
wdenk43d96162003-03-06 00:02:04 +00001438 Time to wait after FPGA configuration. The default is
1439 200 mS.
wdenkc6097192002-11-03 00:24:07 +00001440
1441- Configuration Management:
1442 CONFIG_IDENT_STRING
1443
wdenk43d96162003-03-06 00:02:04 +00001444 If defined, this string will be added to the U-Boot
1445 version information (U_BOOT_VERSION)
wdenkc6097192002-11-03 00:24:07 +00001446
1447- Vendor Parameter Protection:
1448
wdenk43d96162003-03-06 00:02:04 +00001449 U-Boot considers the values of the environment
1450 variables "serial#" (Board Serial Number) and
wdenk7152b1d2003-09-05 23:19:14 +00001451 "ethaddr" (Ethernet Address) to be parameters that
wdenk43d96162003-03-06 00:02:04 +00001452 are set once by the board vendor / manufacturer, and
1453 protects these variables from casual modification by
1454 the user. Once set, these variables are read-only,
1455 and write or delete attempts are rejected. You can
1456 change this behviour:
wdenkc6097192002-11-03 00:24:07 +00001457
1458 If CONFIG_ENV_OVERWRITE is #defined in your config
1459 file, the write protection for vendor parameters is
wdenk47cd00f2003-03-06 13:39:27 +00001460 completely disabled. Anybody can change or delete
wdenkc6097192002-11-03 00:24:07 +00001461 these parameters.
1462
1463 Alternatively, if you #define _both_ CONFIG_ETHADDR
1464 _and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default
1465 ethernet address is installed in the environment,
1466 which can be changed exactly ONCE by the user. [The
1467 serial# is unaffected by this, i. e. it remains
1468 read-only.]
1469
1470- Protected RAM:
1471 CONFIG_PRAM
1472
1473 Define this variable to enable the reservation of
1474 "protected RAM", i. e. RAM which is not overwritten
1475 by U-Boot. Define CONFIG_PRAM to hold the number of
1476 kB you want to reserve for pRAM. You can overwrite
1477 this default value by defining an environment
1478 variable "pram" to the number of kB you want to
1479 reserve. Note that the board info structure will
1480 still show the full amount of RAM. If pRAM is
1481 reserved, a new environment variable "mem" will
1482 automatically be defined to hold the amount of
1483 remaining RAM in a form that can be passed as boot
1484 argument to Linux, for instance like that:
1485
Wolfgang Denkfe126d82005-11-20 21:40:11 +01001486 setenv bootargs ... mem=\${mem}
wdenkc6097192002-11-03 00:24:07 +00001487 saveenv
1488
1489 This way you can tell Linux not to use this memory,
1490 either, which results in a memory region that will
1491 not be affected by reboots.
1492
1493 *WARNING* If your board configuration uses automatic
1494 detection of the RAM size, you must make sure that
1495 this memory test is non-destructive. So far, the
1496 following board configurations are known to be
1497 "pRAM-clean":
1498
1499 ETX094, IVMS8, IVML24, SPD8xx, TQM8xxL,
1500 HERMES, IP860, RPXlite, LWMON, LANTEC,
1501 PCU_E, FLAGADM, TQM8260
1502
1503- Error Recovery:
1504 CONFIG_PANIC_HANG
1505
1506 Define this variable to stop the system in case of a
1507 fatal error, so that you have to reset it manually.
1508 This is probably NOT a good idea for an embedded
1509 system where you want to system to reboot
1510 automatically as fast as possible, but it may be
1511 useful during development since you can try to debug
1512 the conditions that lead to the situation.
1513
1514 CONFIG_NET_RETRY_COUNT
1515
wdenk43d96162003-03-06 00:02:04 +00001516 This variable defines the number of retries for
1517 network operations like ARP, RARP, TFTP, or BOOTP
1518 before giving up the operation. If not defined, a
1519 default value of 5 is used.
wdenkc6097192002-11-03 00:24:07 +00001520
1521- Command Interpreter:
Wolfgang Denk8078f1a2006-10-28 02:28:02 +02001522 CONFIG_AUTO_COMPLETE
wdenk04a85b32004-04-15 18:22:41 +00001523
1524 Enable auto completion of commands using TAB.
1525
Wolfgang Denka9398e02006-11-27 15:32:42 +01001526 Note that this feature has NOT been implemented yet
1527 for the "hush" shell.
Wolfgang Denk8078f1a2006-10-28 02:28:02 +02001528
1529
wdenkc6097192002-11-03 00:24:07 +00001530 CFG_HUSH_PARSER
1531
1532 Define this variable to enable the "hush" shell (from
1533 Busybox) as command line interpreter, thus enabling
1534 powerful command line syntax like
1535 if...then...else...fi conditionals or `&&' and '||'
1536 constructs ("shell scripts").
1537
1538 If undefined, you get the old, much simpler behaviour
1539 with a somewhat smaller memory footprint.
1540
1541
1542 CFG_PROMPT_HUSH_PS2
1543
1544 This defines the secondary prompt string, which is
1545 printed when the command interpreter needs more input
1546 to complete a command. Usually "> ".
1547
1548 Note:
1549
wdenk8bde7f72003-06-27 21:31:46 +00001550 In the current implementation, the local variables
1551 space and global environment variables space are
1552 separated. Local variables are those you define by
1553 simply typing `name=value'. To access a local
1554 variable later on, you have write `$name' or
1555 `${name}'; to execute the contents of a variable
1556 directly type `$name' at the command prompt.
wdenkc6097192002-11-03 00:24:07 +00001557
wdenk43d96162003-03-06 00:02:04 +00001558 Global environment variables are those you use
1559 setenv/printenv to work with. To run a command stored
1560 in such a variable, you need to use the run command,
1561 and you must not use the '$' sign to access them.
wdenkc6097192002-11-03 00:24:07 +00001562
1563 To store commands and special characters in a
1564 variable, please use double quotation marks
1565 surrounding the whole text of the variable, instead
1566 of the backslashes before semicolons and special
1567 symbols.
1568
Wolfgang Denkaa0c71a2006-07-21 11:35:21 +02001569- Commandline Editing and History:
1570 CONFIG_CMDLINE_EDITING
1571
Wolfgang Denkb9365a22006-07-21 11:56:05 +02001572 Enable editiong and History functions for interactive
1573 commandline input operations
Wolfgang Denkaa0c71a2006-07-21 11:35:21 +02001574
wdenka8c7c702003-12-06 19:49:23 +00001575- Default Environment:
wdenkc6097192002-11-03 00:24:07 +00001576 CONFIG_EXTRA_ENV_SETTINGS
1577
wdenk43d96162003-03-06 00:02:04 +00001578 Define this to contain any number of null terminated
1579 strings (variable = value pairs) that will be part of
wdenk7152b1d2003-09-05 23:19:14 +00001580 the default environment compiled into the boot image.
wdenk2262cfe2002-11-18 00:14:45 +00001581
wdenk43d96162003-03-06 00:02:04 +00001582 For example, place something like this in your
1583 board's config file:
wdenkc6097192002-11-03 00:24:07 +00001584
1585 #define CONFIG_EXTRA_ENV_SETTINGS \
1586 "myvar1=value1\0" \
1587 "myvar2=value2\0"
1588
wdenk43d96162003-03-06 00:02:04 +00001589 Warning: This method is based on knowledge about the
1590 internal format how the environment is stored by the
1591 U-Boot code. This is NOT an official, exported
1592 interface! Although it is unlikely that this format
wdenk7152b1d2003-09-05 23:19:14 +00001593 will change soon, there is no guarantee either.
wdenkc6097192002-11-03 00:24:07 +00001594 You better know what you are doing here.
1595
wdenk43d96162003-03-06 00:02:04 +00001596 Note: overly (ab)use of the default environment is
1597 discouraged. Make sure to check other ways to preset
1598 the environment like the autoscript function or the
1599 boot command first.
wdenkc6097192002-11-03 00:24:07 +00001600
wdenka8c7c702003-12-06 19:49:23 +00001601- DataFlash Support:
wdenk2abbe072003-06-16 23:50:08 +00001602 CONFIG_HAS_DATAFLASH
1603
wdenk8bde7f72003-06-27 21:31:46 +00001604 Defining this option enables DataFlash features and
1605 allows to read/write in Dataflash via the standard
1606 commands cp, md...
wdenk2abbe072003-06-16 23:50:08 +00001607
wdenk3f85ce22004-02-23 16:11:30 +00001608- SystemACE Support:
1609 CONFIG_SYSTEMACE
1610
1611 Adding this option adds support for Xilinx SystemACE
1612 chips attached via some sort of local bus. The address
1613 of the chip must alsh be defined in the
1614 CFG_SYSTEMACE_BASE macro. For example:
1615
1616 #define CONFIG_SYSTEMACE
1617 #define CFG_SYSTEMACE_BASE 0xf0000000
1618
1619 When SystemACE support is added, the "ace" device type
1620 becomes available to the fat commands, i.e. fatls.
1621
Wolfgang Denkecb0ccd2005-09-24 22:37:32 +02001622- TFTP Fixed UDP Port:
1623 CONFIG_TFTP_PORT
1624
Wolfgang Denk28cb9372005-09-24 23:25:46 +02001625 If this is defined, the environment variable tftpsrcp
Wolfgang Denkecb0ccd2005-09-24 22:37:32 +02001626 is used to supply the TFTP UDP source port value.
Wolfgang Denk28cb9372005-09-24 23:25:46 +02001627 If tftpsrcp isn't defined, the normal pseudo-random port
Wolfgang Denkecb0ccd2005-09-24 22:37:32 +02001628 number generator is used.
1629
Wolfgang Denk28cb9372005-09-24 23:25:46 +02001630 Also, the environment variable tftpdstp is used to supply
1631 the TFTP UDP destination port value. If tftpdstp isn't
1632 defined, the normal port 69 is used.
1633
1634 The purpose for tftpsrcp is to allow a TFTP server to
Wolfgang Denkecb0ccd2005-09-24 22:37:32 +02001635 blindly start the TFTP transfer using the pre-configured
1636 target IP address and UDP port. This has the effect of
1637 "punching through" the (Windows XP) firewall, allowing
1638 the remainder of the TFTP transfer to proceed normally.
1639 A better solution is to properly configure the firewall,
1640 but sometimes that is not allowed.
1641
wdenka8c7c702003-12-06 19:49:23 +00001642- Show boot progress:
wdenkc6097192002-11-03 00:24:07 +00001643 CONFIG_SHOW_BOOT_PROGRESS
1644
wdenk43d96162003-03-06 00:02:04 +00001645 Defining this option allows to add some board-
1646 specific code (calling a user-provided function
1647 "show_boot_progress(int)") that enables you to show
1648 the system's boot progress on some display (for
1649 example, some LED's) on your board. At the moment,
1650 the following checkpoints are implemented:
wdenkc6097192002-11-03 00:24:07 +00001651
1652 Arg Where When
1653 1 common/cmd_bootm.c before attempting to boot an image
wdenkba56f622004-02-06 23:19:44 +00001654 -1 common/cmd_bootm.c Image header has bad magic number
wdenkc6097192002-11-03 00:24:07 +00001655 2 common/cmd_bootm.c Image header has correct magic number
wdenkba56f622004-02-06 23:19:44 +00001656 -2 common/cmd_bootm.c Image header has bad checksum
wdenkc6097192002-11-03 00:24:07 +00001657 3 common/cmd_bootm.c Image header has correct checksum
wdenkba56f622004-02-06 23:19:44 +00001658 -3 common/cmd_bootm.c Image data has bad checksum
wdenkc6097192002-11-03 00:24:07 +00001659 4 common/cmd_bootm.c Image data has correct checksum
1660 -4 common/cmd_bootm.c Image is for unsupported architecture
1661 5 common/cmd_bootm.c Architecture check OK
1662 -5 common/cmd_bootm.c Wrong Image Type (not kernel, multi, standalone)
1663 6 common/cmd_bootm.c Image Type check OK
1664 -6 common/cmd_bootm.c gunzip uncompression error
1665 -7 common/cmd_bootm.c Unimplemented compression type
1666 7 common/cmd_bootm.c Uncompression OK
1667 -8 common/cmd_bootm.c Wrong Image Type (not kernel, multi, standalone)
1668 8 common/cmd_bootm.c Image Type check OK
1669 -9 common/cmd_bootm.c Unsupported OS (not Linux, BSD, VxWorks, QNX)
1670 9 common/cmd_bootm.c Start initial ramdisk verification
wdenkba56f622004-02-06 23:19:44 +00001671 -10 common/cmd_bootm.c Ramdisk header has bad magic number
1672 -11 common/cmd_bootm.c Ramdisk header has bad checksum
wdenkc6097192002-11-03 00:24:07 +00001673 10 common/cmd_bootm.c Ramdisk header is OK
wdenkba56f622004-02-06 23:19:44 +00001674 -12 common/cmd_bootm.c Ramdisk data has bad checksum
wdenkc6097192002-11-03 00:24:07 +00001675 11 common/cmd_bootm.c Ramdisk data has correct checksum
1676 12 common/cmd_bootm.c Ramdisk verification complete, start loading
1677 -13 common/cmd_bootm.c Wrong Image Type (not PPC Linux Ramdisk)
1678 13 common/cmd_bootm.c Start multifile image verification
1679 14 common/cmd_bootm.c No initial ramdisk, no multifile, continue.
1680 15 common/cmd_bootm.c All preparation done, transferring control to OS
1681
wdenk11dadd52004-02-27 00:07:27 +00001682 -30 lib_ppc/board.c Fatal error, hang the system
1683 -31 post/post.c POST test failed, detected by post_output_backlog()
1684 -32 post/post.c POST test failed, detected by post_run_single()
wdenk63e73c92004-02-23 22:22:28 +00001685
Heiko Schocher566a4942007-06-22 19:11:54 +02001686 34 common/cmd_doc.c before loading a Image from a DOC device
1687 -35 common/cmd_doc.c Bad usage of "doc" command
1688 35 common/cmd_doc.c correct usage of "doc" command
1689 -36 common/cmd_doc.c No boot device
1690 36 common/cmd_doc.c correct boot device
1691 -37 common/cmd_doc.c Unknown Chip ID on boot device
1692 37 common/cmd_doc.c correct chip ID found, device available
1693 -38 common/cmd_doc.c Read Error on boot device
1694 38 common/cmd_doc.c reading Image header from DOC device OK
1695 -39 common/cmd_doc.c Image header has bad magic number
1696 39 common/cmd_doc.c Image header has correct magic number
1697 -40 common/cmd_doc.c Error reading Image from DOC device
1698 40 common/cmd_doc.c Image header has correct magic number
1699 41 common/cmd_ide.c before loading a Image from a IDE device
1700 -42 common/cmd_ide.c Bad usage of "ide" command
1701 42 common/cmd_ide.c correct usage of "ide" command
1702 -43 common/cmd_ide.c No boot device
1703 43 common/cmd_ide.c boot device found
1704 -44 common/cmd_ide.c Device not available
1705 44 common/cmd_ide.c Device available
1706 -45 common/cmd_ide.c wrong partition selected
1707 45 common/cmd_ide.c partition selected
1708 -46 common/cmd_ide.c Unknown partition table
1709 46 common/cmd_ide.c valid partition table found
1710 -47 common/cmd_ide.c Invalid partition type
1711 47 common/cmd_ide.c correct partition type
1712 -48 common/cmd_ide.c Error reading Image Header on boot device
1713 48 common/cmd_ide.c reading Image Header from IDE device OK
1714 -49 common/cmd_ide.c Image header has bad magic number
1715 49 common/cmd_ide.c Image header has correct magic number
1716 -50 common/cmd_ide.c Image header has bad checksum
1717 50 common/cmd_ide.c Image header has correct checksum
1718 -51 common/cmd_ide.c Error reading Image from IDE device
1719 51 common/cmd_ide.c reading Image from IDE device OK
1720 52 common/cmd_nand.c before loading a Image from a NAND device
1721 -53 common/cmd_nand.c Bad usage of "nand" command
1722 53 common/cmd_nand.c correct usage of "nand" command
1723 -54 common/cmd_nand.c No boot device
1724 54 common/cmd_nand.c boot device found
1725 -55 common/cmd_nand.c Unknown Chip ID on boot device
1726 55 common/cmd_nand.c correct chip ID found, device available
1727 -56 common/cmd_nand.c Error reading Image Header on boot device
1728 56 common/cmd_nand.c reading Image Header from NAND device OK
1729 -57 common/cmd_nand.c Image header has bad magic number
1730 57 common/cmd_nand.c Image header has correct magic number
1731 -58 common/cmd_nand.c Error reading Image from NAND device
1732 58 common/cmd_nand.c reading Image from NAND device OK
wdenkc6097192002-11-03 00:24:07 +00001733
Heiko Schocher566a4942007-06-22 19:11:54 +02001734 -60 common/env_common.c Environment has a bad CRC, using default
wdenkc6097192002-11-03 00:24:07 +00001735
Heiko Schocher566a4942007-06-22 19:11:54 +02001736 64 net/eth.c starting with Ethernetconfiguration.
1737 -64 net/eth.c no Ethernet found.
1738 65 net/eth.c Ethernet found.
wdenk206c60c2003-09-18 10:02:25 +00001739
Heiko Schocher566a4942007-06-22 19:11:54 +02001740 -80 common/cmd_net.c usage wrong
1741 80 common/cmd_net.c before calling NetLoop()
1742 -81 common/cmd_net.c some error in NetLoop() occured
1743 81 common/cmd_net.c NetLoop() back without error
1744 -82 common/cmd_net.c size == 0 (File with size 0 loaded)
1745 82 common/cmd_net.c trying automatic boot
1746 83 common/cmd_net.c running autoscript
1747 -83 common/cmd_net.c some error in automatic boot or autoscript
1748 84 common/cmd_net.c end without errors
wdenkc6097192002-11-03 00:24:07 +00001749
1750Modem Support:
1751--------------
1752
wdenk85ec0bc2003-03-31 16:34:49 +00001753[so far only for SMDK2400 and TRAB boards]
wdenkc6097192002-11-03 00:24:07 +00001754
1755- Modem support endable:
1756 CONFIG_MODEM_SUPPORT
1757
1758- RTS/CTS Flow control enable:
1759 CONFIG_HWFLOW
1760
1761- Modem debug support:
1762 CONFIG_MODEM_SUPPORT_DEBUG
1763
wdenk43d96162003-03-06 00:02:04 +00001764 Enables debugging stuff (char screen[1024], dbg())
1765 for modem support. Useful only with BDI2000.
wdenkc6097192002-11-03 00:24:07 +00001766
wdenka8c7c702003-12-06 19:49:23 +00001767- Interrupt support (PPC):
1768
wdenkd4ca31c2004-01-02 14:00:00 +00001769 There are common interrupt_init() and timer_interrupt()
1770 for all PPC archs. interrupt_init() calls interrupt_init_cpu()
1771 for cpu specific initialization. interrupt_init_cpu()
1772 should set decrementer_count to appropriate value. If
1773 cpu resets decrementer automatically after interrupt
1774 (ppc4xx) it should set decrementer_count to zero.
1775 timer_interrupt() calls timer_interrupt_cpu() for cpu
1776 specific handling. If board has watchdog / status_led
1777 / other_activity_monitor it works automatically from
1778 general timer_interrupt().
wdenka8c7c702003-12-06 19:49:23 +00001779
wdenkc6097192002-11-03 00:24:07 +00001780- General:
1781
wdenk43d96162003-03-06 00:02:04 +00001782 In the target system modem support is enabled when a
1783 specific key (key combination) is pressed during
1784 power-on. Otherwise U-Boot will boot normally
1785 (autoboot). The key_pressed() fuction is called from
1786 board_init(). Currently key_pressed() is a dummy
1787 function, returning 1 and thus enabling modem
1788 initialization.
wdenkc6097192002-11-03 00:24:07 +00001789
wdenk43d96162003-03-06 00:02:04 +00001790 If there are no modem init strings in the
1791 environment, U-Boot proceed to autoboot; the
1792 previous output (banner, info printfs) will be
1793 supressed, though.
wdenkc6097192002-11-03 00:24:07 +00001794
1795 See also: doc/README.Modem
1796
1797
wdenkc6097192002-11-03 00:24:07 +00001798Configuration Settings:
1799-----------------------
1800
1801- CFG_LONGHELP: Defined when you want long help messages included;
1802 undefine this when you're short of memory.
1803
1804- CFG_PROMPT: This is what U-Boot prints on the console to
1805 prompt for user input.
1806
1807- CFG_CBSIZE: Buffer size for input from the Console
1808
1809- CFG_PBSIZE: Buffer size for Console output
1810
1811- CFG_MAXARGS: max. Number of arguments accepted for monitor commands
1812
1813- CFG_BARGSIZE: Buffer size for Boot Arguments which are passed to
1814 the application (usually a Linux kernel) when it is
1815 booted
1816
1817- CFG_BAUDRATE_TABLE:
1818 List of legal baudrate settings for this board.
1819
1820- CFG_CONSOLE_INFO_QUIET
wdenk8bde7f72003-06-27 21:31:46 +00001821 Suppress display of console information at boot.
wdenkc6097192002-11-03 00:24:07 +00001822
1823- CFG_CONSOLE_IS_IN_ENV
wdenk8bde7f72003-06-27 21:31:46 +00001824 If the board specific function
1825 extern int overwrite_console (void);
1826 returns 1, the stdin, stderr and stdout are switched to the
wdenkc6097192002-11-03 00:24:07 +00001827 serial port, else the settings in the environment are used.
1828
1829- CFG_CONSOLE_OVERWRITE_ROUTINE
wdenk8bde7f72003-06-27 21:31:46 +00001830 Enable the call to overwrite_console().
wdenkc6097192002-11-03 00:24:07 +00001831
1832- CFG_CONSOLE_ENV_OVERWRITE
1833 Enable overwrite of previous console environment settings.
1834
1835- CFG_MEMTEST_START, CFG_MEMTEST_END:
1836 Begin and End addresses of the area used by the
1837 simple memory test.
1838
1839- CFG_ALT_MEMTEST:
wdenk8bde7f72003-06-27 21:31:46 +00001840 Enable an alternate, more extensive memory test.
wdenkc6097192002-11-03 00:24:07 +00001841
wdenk5f535fe2003-09-18 09:21:33 +00001842- CFG_MEMTEST_SCRATCH:
1843 Scratch address used by the alternate memory test
1844 You only need to set this if address zero isn't writeable
1845
wdenkc6097192002-11-03 00:24:07 +00001846- CFG_TFTP_LOADADDR:
1847 Default load address for network file downloads
1848
1849- CFG_LOADS_BAUD_CHANGE:
1850 Enable temporary baudrate change while serial download
1851
1852- CFG_SDRAM_BASE:
1853 Physical start address of SDRAM. _Must_ be 0 here.
1854
1855- CFG_MBIO_BASE:
1856 Physical start address of Motherboard I/O (if using a
1857 Cogent motherboard)
1858
1859- CFG_FLASH_BASE:
1860 Physical start address of Flash memory.
1861
1862- CFG_MONITOR_BASE:
1863 Physical start address of boot monitor code (set by
1864 make config files to be same as the text base address
1865 (TEXT_BASE) used when linking) - same as
1866 CFG_FLASH_BASE when booting from flash.
1867
1868- CFG_MONITOR_LEN:
wdenk8bde7f72003-06-27 21:31:46 +00001869 Size of memory reserved for monitor code, used to
1870 determine _at_compile_time_ (!) if the environment is
1871 embedded within the U-Boot image, or in a separate
1872 flash sector.
wdenkc6097192002-11-03 00:24:07 +00001873
1874- CFG_MALLOC_LEN:
1875 Size of DRAM reserved for malloc() use.
1876
Stefan Roese15940c92006-03-13 11:16:36 +01001877- CFG_BOOTM_LEN:
1878 Normally compressed uImages are limited to an
1879 uncompressed size of 8 MBytes. If this is not enough,
1880 you can define CFG_BOOTM_LEN in your board config file
1881 to adjust this setting to your needs.
1882
wdenkc6097192002-11-03 00:24:07 +00001883- CFG_BOOTMAPSZ:
1884 Maximum size of memory mapped by the startup code of
1885 the Linux kernel; all data that must be processed by
1886 the Linux kernel (bd_info, boot arguments, eventually
1887 initrd image) must be put below this limit.
1888
1889- CFG_MAX_FLASH_BANKS:
1890 Max number of Flash memory banks
1891
1892- CFG_MAX_FLASH_SECT:
1893 Max number of sectors on a Flash chip
1894
1895- CFG_FLASH_ERASE_TOUT:
1896 Timeout for Flash erase operations (in ms)
1897
1898- CFG_FLASH_WRITE_TOUT:
1899 Timeout for Flash write operations (in ms)
1900
wdenk8564acf2003-07-14 22:13:32 +00001901- CFG_FLASH_LOCK_TOUT
1902 Timeout for Flash set sector lock bit operation (in ms)
1903
1904- CFG_FLASH_UNLOCK_TOUT
1905 Timeout for Flash clear lock bits operation (in ms)
1906
1907- CFG_FLASH_PROTECTION
1908 If defined, hardware flash sectors protection is used
1909 instead of U-Boot software protection.
1910
wdenkc6097192002-11-03 00:24:07 +00001911- CFG_DIRECT_FLASH_TFTP:
1912
1913 Enable TFTP transfers directly to flash memory;
1914 without this option such a download has to be
1915 performed in two steps: (1) download to RAM, and (2)
1916 copy from RAM to flash.
1917
1918 The two-step approach is usually more reliable, since
1919 you can check if the download worked before you erase
1920 the flash, but in some situations (when sytem RAM is
1921 too limited to allow for a tempory copy of the
1922 downloaded image) this option may be very useful.
1923
1924- CFG_FLASH_CFI:
wdenk43d96162003-03-06 00:02:04 +00001925 Define if the flash driver uses extra elements in the
wdenk5653fc32004-02-08 22:55:38 +00001926 common flash structure for storing flash geometry.
1927
1928- CFG_FLASH_CFI_DRIVER
1929 This option also enables the building of the cfi_flash driver
1930 in the drivers directory
wdenkc6097192002-11-03 00:24:07 +00001931
Stefan Roese5568e612005-11-22 13:20:42 +01001932- CFG_FLASH_QUIET_TEST
1933 If this option is defined, the common CFI flash doesn't
1934 print it's warning upon not recognized FLASH banks. This
1935 is useful, if some of the configured banks are only
1936 optionally available.
1937
stroese53cf9432003-06-05 15:39:44 +00001938- CFG_RX_ETH_BUFFER:
1939 Defines the number of ethernet receive buffers. On some
1940 ethernet controllers it is recommended to set this value
1941 to 8 or even higher (EEPRO100 or 405 EMAC), since all
1942 buffers can be full shortly after enabling the interface
1943 on high ethernet traffic.
1944 Defaults to 4 if not defined.
1945
wdenkc6097192002-11-03 00:24:07 +00001946The following definitions that deal with the placement and management
1947of environment data (variable area); in general, we support the
1948following configurations:
1949
1950- CFG_ENV_IS_IN_FLASH:
1951
1952 Define this if the environment is in flash memory.
1953
1954 a) The environment occupies one whole flash sector, which is
1955 "embedded" in the text segment with the U-Boot code. This
1956 happens usually with "bottom boot sector" or "top boot
1957 sector" type flash chips, which have several smaller
1958 sectors at the start or the end. For instance, such a
1959 layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In
1960 such a case you would place the environment in one of the
1961 4 kB sectors - with U-Boot code before and after it. With
1962 "top boot sector" type flash chips, you would put the
1963 environment in one of the last sectors, leaving a gap
1964 between U-Boot and the environment.
1965
1966 - CFG_ENV_OFFSET:
1967
1968 Offset of environment data (variable area) to the
1969 beginning of flash memory; for instance, with bottom boot
1970 type flash chips the second sector can be used: the offset
1971 for this sector is given here.
1972
1973 CFG_ENV_OFFSET is used relative to CFG_FLASH_BASE.
1974
1975 - CFG_ENV_ADDR:
1976
1977 This is just another way to specify the start address of
1978 the flash sector containing the environment (instead of
1979 CFG_ENV_OFFSET).
1980
1981 - CFG_ENV_SECT_SIZE:
1982
1983 Size of the sector containing the environment.
1984
1985
1986 b) Sometimes flash chips have few, equal sized, BIG sectors.
1987 In such a case you don't want to spend a whole sector for
1988 the environment.
1989
1990 - CFG_ENV_SIZE:
1991
1992 If you use this in combination with CFG_ENV_IS_IN_FLASH
1993 and CFG_ENV_SECT_SIZE, you can specify to use only a part
1994 of this flash sector for the environment. This saves
1995 memory for the RAM copy of the environment.
1996
1997 It may also save flash memory if you decide to use this
1998 when your environment is "embedded" within U-Boot code,
1999 since then the remainder of the flash sector could be used
2000 for U-Boot code. It should be pointed out that this is
2001 STRONGLY DISCOURAGED from a robustness point of view:
2002 updating the environment in flash makes it always
2003 necessary to erase the WHOLE sector. If something goes
2004 wrong before the contents has been restored from a copy in
2005 RAM, your target system will be dead.
2006
2007 - CFG_ENV_ADDR_REDUND
2008 CFG_ENV_SIZE_REDUND
2009
wdenk43d96162003-03-06 00:02:04 +00002010 These settings describe a second storage area used to hold
2011 a redundand copy of the environment data, so that there is
wdenk3e386912003-04-05 00:53:31 +00002012 a valid backup copy in case there is a power failure during
wdenk43d96162003-03-06 00:02:04 +00002013 a "saveenv" operation.
wdenkc6097192002-11-03 00:24:07 +00002014
2015BE CAREFUL! Any changes to the flash layout, and some changes to the
2016source code will make it necessary to adapt <board>/u-boot.lds*
2017accordingly!
2018
2019
2020- CFG_ENV_IS_IN_NVRAM:
2021
2022 Define this if you have some non-volatile memory device
2023 (NVRAM, battery buffered SRAM) which you want to use for the
2024 environment.
2025
2026 - CFG_ENV_ADDR:
2027 - CFG_ENV_SIZE:
2028
2029 These two #defines are used to determin the memory area you
2030 want to use for environment. It is assumed that this memory
2031 can just be read and written to, without any special
2032 provision.
2033
2034BE CAREFUL! The first access to the environment happens quite early
2035in U-Boot initalization (when we try to get the setting of for the
2036console baudrate). You *MUST* have mappend your NVRAM area then, or
2037U-Boot will hang.
2038
2039Please note that even with NVRAM we still use a copy of the
2040environment in RAM: we could work on NVRAM directly, but we want to
2041keep settings there always unmodified except somebody uses "saveenv"
2042to save the current settings.
2043
2044
2045- CFG_ENV_IS_IN_EEPROM:
2046
2047 Use this if you have an EEPROM or similar serial access
2048 device and a driver for it.
2049
2050 - CFG_ENV_OFFSET:
2051 - CFG_ENV_SIZE:
2052
2053 These two #defines specify the offset and size of the
2054 environment area within the total memory of your EEPROM.
2055
2056 - CFG_I2C_EEPROM_ADDR:
2057 If defined, specified the chip address of the EEPROM device.
2058 The default address is zero.
2059
2060 - CFG_EEPROM_PAGE_WRITE_BITS:
2061 If defined, the number of bits used to address bytes in a
2062 single page in the EEPROM device. A 64 byte page, for example
2063 would require six bits.
2064
2065 - CFG_EEPROM_PAGE_WRITE_DELAY_MS:
2066 If defined, the number of milliseconds to delay between
wdenkba56f622004-02-06 23:19:44 +00002067 page writes. The default is zero milliseconds.
wdenkc6097192002-11-03 00:24:07 +00002068
2069 - CFG_I2C_EEPROM_ADDR_LEN:
2070 The length in bytes of the EEPROM memory array address. Note
2071 that this is NOT the chip address length!
2072
wdenk5cf91d62004-04-23 20:32:05 +00002073 - CFG_I2C_EEPROM_ADDR_OVERFLOW:
2074 EEPROM chips that implement "address overflow" are ones
2075 like Catalyst 24WC04/08/16 which has 9/10/11 bits of
2076 address and the extra bits end up in the "chip address" bit
2077 slots. This makes a 24WC08 (1Kbyte) chip look like four 256
2078 byte chips.
2079
2080 Note that we consider the length of the address field to
2081 still be one byte because the extra address bits are hidden
2082 in the chip address.
2083
wdenkc6097192002-11-03 00:24:07 +00002084 - CFG_EEPROM_SIZE:
2085 The size in bytes of the EEPROM device.
2086
wdenkc6097192002-11-03 00:24:07 +00002087
wdenk5779d8d2003-12-06 23:55:10 +00002088- CFG_ENV_IS_IN_DATAFLASH:
2089
wdenkd4ca31c2004-01-02 14:00:00 +00002090 Define this if you have a DataFlash memory device which you
wdenk5779d8d2003-12-06 23:55:10 +00002091 want to use for the environment.
2092
2093 - CFG_ENV_OFFSET:
2094 - CFG_ENV_ADDR:
2095 - CFG_ENV_SIZE:
2096
2097 These three #defines specify the offset and size of the
2098 environment area within the total memory of your DataFlash placed
2099 at the specified address.
2100
wdenk13a56952004-06-09 14:58:14 +00002101- CFG_ENV_IS_IN_NAND:
2102
2103 Define this if you have a NAND device which you want to use
2104 for the environment.
2105
2106 - CFG_ENV_OFFSET:
2107 - CFG_ENV_SIZE:
2108
2109 These two #defines specify the offset and size of the environment
2110 area within the first NAND device.
wdenk5779d8d2003-12-06 23:55:10 +00002111
Markus Klotzbuechere443c942006-03-20 18:02:44 +01002112 - CFG_ENV_OFFSET_REDUND
2113
2114 This setting describes a second storage area of CFG_ENV_SIZE
2115 size used to hold a redundant copy of the environment data,
2116 so that there is a valid backup copy in case there is a
2117 power failure during a "saveenv" operation.
2118
2119 Note: CFG_ENV_OFFSET and CFG_ENV_OFFSET_REDUND must be aligned
2120 to a block boundary, and CFG_ENV_SIZE must be a multiple of
2121 the NAND devices block size.
2122
wdenkc6097192002-11-03 00:24:07 +00002123- CFG_SPI_INIT_OFFSET
2124
2125 Defines offset to the initial SPI buffer area in DPRAM. The
2126 area is used at an early stage (ROM part) if the environment
2127 is configured to reside in the SPI EEPROM: We need a 520 byte
2128 scratch DPRAM area. It is used between the two initialization
2129 calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems
2130 to be a good choice since it makes it far enough from the
2131 start of the data area as well as from the stack pointer.
2132
Bruce Adlere881cb52007-11-02 13:15:42 -07002133Please note that the environment is read-only until the monitor
wdenkc6097192002-11-03 00:24:07 +00002134has been relocated to RAM and a RAM copy of the environment has been
2135created; also, when using EEPROM you will have to use getenv_r()
2136until then to read environment variables.
2137
wdenk85ec0bc2003-03-31 16:34:49 +00002138The environment is protected by a CRC32 checksum. Before the monitor
2139is relocated into RAM, as a result of a bad CRC you will be working
2140with the compiled-in default environment - *silently*!!! [This is
2141necessary, because the first environment variable we need is the
2142"baudrate" setting for the console - if we have a bad CRC, we don't
2143have any device yet where we could complain.]
wdenkc6097192002-11-03 00:24:07 +00002144
2145Note: once the monitor has been relocated, then it will complain if
2146the default environment is used; a new CRC is computed as soon as you
wdenk85ec0bc2003-03-31 16:34:49 +00002147use the "saveenv" command to store a valid environment.
wdenkc6097192002-11-03 00:24:07 +00002148
wdenkfc3e2162003-10-08 22:33:00 +00002149- CFG_FAULT_ECHO_LINK_DOWN:
wdenk42d1f032003-10-15 23:53:47 +00002150 Echo the inverted Ethernet link state to the fault LED.
wdenkfc3e2162003-10-08 22:33:00 +00002151
2152 Note: If this option is active, then CFG_FAULT_MII_ADDR
2153 also needs to be defined.
2154
2155- CFG_FAULT_MII_ADDR:
wdenk42d1f032003-10-15 23:53:47 +00002156 MII address of the PHY to check for the Ethernet link state.
wdenkc6097192002-11-03 00:24:07 +00002157
wdenkc40b2952004-03-13 23:29:43 +00002158- CFG_64BIT_VSPRINTF:
2159 Makes vsprintf (and all *printf functions) support printing
2160 of 64bit values by using the L quantifier
2161
2162- CFG_64BIT_STRTOUL:
2163 Adds simple_strtoull that returns a 64bit value
2164
wdenkc6097192002-11-03 00:24:07 +00002165Low Level (hardware related) configuration options:
wdenkdc7c9a12003-03-26 06:55:25 +00002166---------------------------------------------------
wdenkc6097192002-11-03 00:24:07 +00002167
2168- CFG_CACHELINE_SIZE:
2169 Cache Line Size of the CPU.
2170
2171- CFG_DEFAULT_IMMR:
2172 Default address of the IMMR after system reset.
wdenk2535d602003-07-17 23:16:40 +00002173
wdenk42d1f032003-10-15 23:53:47 +00002174 Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU,
2175 and RPXsuper) to be able to adjust the position of
2176 the IMMR register after a reset.
wdenkc6097192002-11-03 00:24:07 +00002177
wdenk7f6c2cb2002-11-10 22:06:23 +00002178- Floppy Disk Support:
2179 CFG_FDC_DRIVE_NUMBER
2180
2181 the default drive number (default value 0)
2182
2183 CFG_ISA_IO_STRIDE
2184
2185 defines the spacing between fdc chipset registers
2186 (default value 1)
2187
2188 CFG_ISA_IO_OFFSET
2189
wdenk43d96162003-03-06 00:02:04 +00002190 defines the offset of register from address. It
2191 depends on which part of the data bus is connected to
2192 the fdc chipset. (default value 0)
wdenk7f6c2cb2002-11-10 22:06:23 +00002193
wdenk43d96162003-03-06 00:02:04 +00002194 If CFG_ISA_IO_STRIDE CFG_ISA_IO_OFFSET and
2195 CFG_FDC_DRIVE_NUMBER are undefined, they take their
2196 default value.
wdenk7f6c2cb2002-11-10 22:06:23 +00002197
wdenk43d96162003-03-06 00:02:04 +00002198 if CFG_FDC_HW_INIT is defined, then the function
2199 fdc_hw_init() is called at the beginning of the FDC
2200 setup. fdc_hw_init() must be provided by the board
2201 source code. It is used to make hardware dependant
2202 initializations.
wdenk7f6c2cb2002-11-10 22:06:23 +00002203
wdenk25d67122004-12-10 11:40:40 +00002204- CFG_IMMR: Physical address of the Internal Memory.
wdenkefe2a4d2004-12-16 21:44:03 +00002205 DO NOT CHANGE unless you know exactly what you're
wdenk25d67122004-12-10 11:40:40 +00002206 doing! (11-4) [MPC8xx/82xx systems only]
wdenkc6097192002-11-03 00:24:07 +00002207
2208- CFG_INIT_RAM_ADDR:
2209
wdenk7152b1d2003-09-05 23:19:14 +00002210 Start address of memory area that can be used for
wdenkc6097192002-11-03 00:24:07 +00002211 initial data and stack; please note that this must be
2212 writable memory that is working WITHOUT special
2213 initialization, i. e. you CANNOT use normal RAM which
2214 will become available only after programming the
2215 memory controller and running certain initialization
2216 sequences.
2217
2218 U-Boot uses the following memory types:
2219 - MPC8xx and MPC8260: IMMR (internal memory of the CPU)
2220 - MPC824X: data cache
2221 - PPC4xx: data cache
2222
wdenk85ec0bc2003-03-31 16:34:49 +00002223- CFG_GBL_DATA_OFFSET:
wdenkc6097192002-11-03 00:24:07 +00002224
2225 Offset of the initial data structure in the memory
2226 area defined by CFG_INIT_RAM_ADDR. Usually
wdenk85ec0bc2003-03-31 16:34:49 +00002227 CFG_GBL_DATA_OFFSET is chosen such that the initial
wdenkc6097192002-11-03 00:24:07 +00002228 data is located at the end of the available space
2229 (sometimes written as (CFG_INIT_RAM_END -
2230 CFG_INIT_DATA_SIZE), and the initial stack is just
2231 below that area (growing from (CFG_INIT_RAM_ADDR +
wdenk85ec0bc2003-03-31 16:34:49 +00002232 CFG_GBL_DATA_OFFSET) downward.
wdenkc6097192002-11-03 00:24:07 +00002233
2234 Note:
2235 On the MPC824X (or other systems that use the data
2236 cache for initial memory) the address chosen for
2237 CFG_INIT_RAM_ADDR is basically arbitrary - it must
2238 point to an otherwise UNUSED address space between
2239 the top of RAM and the start of the PCI space.
2240
2241- CFG_SIUMCR: SIU Module Configuration (11-6)
2242
2243- CFG_SYPCR: System Protection Control (11-9)
2244
2245- CFG_TBSCR: Time Base Status and Control (11-26)
2246
2247- CFG_PISCR: Periodic Interrupt Status and Control (11-31)
2248
2249- CFG_PLPRCR: PLL, Low-Power, and Reset Control Register (15-30)
2250
2251- CFG_SCCR: System Clock and reset Control Register (15-27)
2252
2253- CFG_OR_TIMING_SDRAM:
2254 SDRAM timing
2255
2256- CFG_MAMR_PTA:
2257 periodic timer for refresh
2258
2259- CFG_DER: Debug Event Register (37-47)
2260
2261- FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CFG_REMAP_OR_AM,
2262 CFG_PRELIM_OR_AM, CFG_OR_TIMING_FLASH, CFG_OR0_REMAP,
2263 CFG_OR0_PRELIM, CFG_BR0_PRELIM, CFG_OR1_REMAP, CFG_OR1_PRELIM,
2264 CFG_BR1_PRELIM:
2265 Memory Controller Definitions: BR0/1 and OR0/1 (FLASH)
2266
2267- SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE,
2268 CFG_OR_TIMING_SDRAM, CFG_OR2_PRELIM, CFG_BR2_PRELIM,
2269 CFG_OR3_PRELIM, CFG_BR3_PRELIM:
2270 Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM)
2271
2272- CFG_MAMR_PTA, CFG_MPTPR_2BK_4K, CFG_MPTPR_1BK_4K, CFG_MPTPR_2BK_8K,
2273 CFG_MPTPR_1BK_8K, CFG_MAMR_8COL, CFG_MAMR_9COL:
2274 Machine Mode Register and Memory Periodic Timer
2275 Prescaler definitions (SDRAM timing)
2276
2277- CFG_I2C_UCODE_PATCH, CFG_I2C_DPMEM_OFFSET [0x1FC0]:
2278 enable I2C microcode relocation patch (MPC8xx);
2279 define relocation offset in DPRAM [DSP2]
2280
Heiko Schocherb423d052008-01-11 01:12:07 +01002281- CFG_SMC_UCODE_PATCH, CFG_SMC_DPMEM_OFFSET [0x1FC0]:
2282 enable SMC microcode relocation patch (MPC8xx);
2283 define relocation offset in DPRAM [SMC1]
2284
wdenkc6097192002-11-03 00:24:07 +00002285- CFG_SPI_UCODE_PATCH, CFG_SPI_DPMEM_OFFSET [0x1FC0]:
2286 enable SPI microcode relocation patch (MPC8xx);
2287 define relocation offset in DPRAM [SCC4]
2288
2289- CFG_USE_OSCCLK:
2290 Use OSCM clock mode on MBX8xx board. Be careful,
2291 wrong setting might damage your board. Read
2292 doc/README.MBX before setting this variable!
2293
wdenkea909b72002-11-21 23:11:29 +00002294- CFG_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only)
wdenk43d96162003-03-06 00:02:04 +00002295 Offset of the bootmode word in DPRAM used by post
2296 (Power On Self Tests). This definition overrides
2297 #define'd default value in commproc.h resp.
2298 cpm_8260.h.
wdenkea909b72002-11-21 23:11:29 +00002299
stroese1d49b1f2003-05-23 11:39:05 +00002300- CFG_PCI_SLV_MEM_LOCAL, CFG_PCI_SLV_MEM_BUS, CFG_PICMR0_MASK_ATTRIB,
2301 CFG_PCI_MSTR0_LOCAL, CFG_PCIMSK0_MASK, CFG_PCI_MSTR1_LOCAL,
2302 CFG_PCIMSK1_MASK, CFG_PCI_MSTR_MEM_LOCAL, CFG_PCI_MSTR_MEM_BUS,
2303 CFG_CPU_PCI_MEM_START, CFG_PCI_MSTR_MEM_SIZE, CFG_POCMR0_MASK_ATTRIB,
2304 CFG_PCI_MSTR_MEMIO_LOCAL, CFG_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START,
2305 CFG_PCI_MSTR_MEMIO_SIZE, CFG_POCMR1_MASK_ATTRIB, CFG_PCI_MSTR_IO_LOCAL,
2306 CFG_PCI_MSTR_IO_BUS, CFG_CPU_PCI_IO_START, CFG_PCI_MSTR_IO_SIZE,
wdenk5d232d02003-05-22 22:52:13 +00002307 CFG_POCMR2_MASK_ATTRIB: (MPC826x only)
2308 Overrides the default PCI memory map in cpu/mpc8260/pci.c if set.
2309
Ben Warrenbb99ad62006-09-07 16:50:54 -04002310- CONFIG_SPD_EEPROM
2311 Get DDR timing information from an I2C EEPROM. Common with pluggable
2312 memory modules such as SODIMMs
2313 SPD_EEPROM_ADDRESS
2314 I2C address of the SPD EEPROM
2315
2316- CFG_SPD_BUS_NUM
2317 If SPD EEPROM is on an I2C bus other than the first one, specify here.
2318 Note that the value must resolve to something your driver can deal with.
2319
Timur Tabi2ad6b512006-10-31 18:44:42 -06002320- CFG_83XX_DDR_USES_CS0
2321 Only for 83xx systems. If specified, then DDR should be configured
2322 using CS0 and CS1 instead of CS2 and CS3.
2323
2324- CFG_83XX_DDR_USES_CS0
2325 Only for 83xx systems. If specified, then DDR should be configured
2326 using CS0 and CS1 instead of CS2 and CS3.
2327
wdenkc26e4542004-04-18 10:13:26 +00002328- CONFIG_ETHER_ON_FEC[12]
2329 Define to enable FEC[12] on a 8xx series processor.
2330
2331- CONFIG_FEC[12]_PHY
2332 Define to the hardcoded PHY address which corresponds
wdenk6e592382004-04-18 17:39:38 +00002333 to the given FEC; i. e.
2334 #define CONFIG_FEC1_PHY 4
wdenkc26e4542004-04-18 10:13:26 +00002335 means that the PHY with address 4 is connected to FEC1
2336
2337 When set to -1, means to probe for first available.
2338
2339- CONFIG_FEC[12]_PHY_NORXERR
2340 The PHY does not have a RXERR line (RMII only).
2341 (so program the FEC to ignore it).
2342
2343- CONFIG_RMII
2344 Enable RMII mode for all FECs.
2345 Note that this is a global option, we can't
2346 have one FEC in standard MII mode and another in RMII mode.
2347
wdenk5cf91d62004-04-23 20:32:05 +00002348- CONFIG_CRC32_VERIFY
2349 Add a verify option to the crc32 command.
2350 The syntax is:
2351
2352 => crc32 -v <address> <count> <crc32>
2353
2354 Where address/count indicate a memory area
2355 and crc32 is the correct crc32 which the
2356 area should have.
2357
wdenk56523f12004-07-11 17:40:54 +00002358- CONFIG_LOOPW
2359 Add the "loopw" memory command. This only takes effect if
Jon Loeliger602ad3b2007-06-11 19:03:39 -05002360 the memory commands are activated globally (CONFIG_CMD_MEM).
wdenk56523f12004-07-11 17:40:54 +00002361
stroese7b466642004-12-16 18:46:55 +00002362- CONFIG_MX_CYCLIC
2363 Add the "mdc" and "mwc" memory commands. These are cyclic
2364 "md/mw" commands.
2365 Examples:
2366
wdenkefe2a4d2004-12-16 21:44:03 +00002367 => mdc.b 10 4 500
stroese7b466642004-12-16 18:46:55 +00002368 This command will print 4 bytes (10,11,12,13) each 500 ms.
2369
wdenkefe2a4d2004-12-16 21:44:03 +00002370 => mwc.l 100 12345678 10
stroese7b466642004-12-16 18:46:55 +00002371 This command will write 12345678 to address 100 all 10 ms.
2372
wdenkefe2a4d2004-12-16 21:44:03 +00002373 This only takes effect if the memory commands are activated
Jon Loeliger602ad3b2007-06-11 19:03:39 -05002374 globally (CONFIG_CMD_MEM).
stroese7b466642004-12-16 18:46:55 +00002375
wdenk8aa1a2d2005-04-04 12:44:11 +00002376- CONFIG_SKIP_LOWLEVEL_INIT
2377- CONFIG_SKIP_RELOCATE_UBOOT
2378
wdenk3c2b3d42005-04-05 23:32:21 +00002379 [ARM only] If these variables are defined, then
2380 certain low level initializations (like setting up
2381 the memory controller) are omitted and/or U-Boot does
2382 not relocate itself into RAM.
2383 Normally these variables MUST NOT be defined. The
2384 only exception is when U-Boot is loaded (to RAM) by
2385 some other boot loader or by a debugger which
2386 performs these intializations itself.
wdenk8aa1a2d2005-04-04 12:44:11 +00002387
wdenk400558b2005-04-02 23:52:25 +00002388
wdenkc6097192002-11-03 00:24:07 +00002389Building the Software:
2390======================
2391
2392Building U-Boot has been tested in native PPC environments (on a
2393PowerBook G3 running LinuxPPC 2000) and in cross environments
2394(running RedHat 6.x and 7.x Linux on x86, Solaris 2.6 on a SPARC, and
2395NetBSD 1.5 on x86).
2396
2397If you are not using a native PPC environment, it is assumed that you
2398have the GNU cross compiling tools available in your path and named
2399with a prefix of "powerpc-linux-". If this is not the case, (e.g. if
2400you are using Monta Vista's Hard Hat Linux CDK 1.2) you must change
2401the definition of CROSS_COMPILE in Makefile. For HHL on a 4xx CPU,
2402change it to:
2403
2404 CROSS_COMPILE = ppc_4xx-
2405
2406
wdenkba56f622004-02-06 23:19:44 +00002407U-Boot is intended to be simple to build. After installing the
wdenkc6097192002-11-03 00:24:07 +00002408sources you must configure U-Boot for one specific board type. This
2409is done by typing:
2410
2411 make NAME_config
2412
2413where "NAME_config" is the name of one of the existing
Kim Phillips26281142007-08-10 13:28:25 -05002414configurations; see the main Makefile for supported names.
wdenk54387ac2003-10-08 22:45:44 +00002415
wdenk2729af92004-05-03 20:45:30 +00002416Note: for some board special configuration names may exist; check if
2417 additional information is available from the board vendor; for
2418 instance, the TQM823L systems are available without (standard)
2419 or with LCD support. You can select such additional "features"
2420 when chosing the configuration, i. e.
wdenkc6097192002-11-03 00:24:07 +00002421
wdenk2729af92004-05-03 20:45:30 +00002422 make TQM823L_config
2423 - will configure for a plain TQM823L, i. e. no LCD support
wdenkc6097192002-11-03 00:24:07 +00002424
wdenk2729af92004-05-03 20:45:30 +00002425 make TQM823L_LCD_config
2426 - will configure for a TQM823L with U-Boot console on LCD
wdenkc6097192002-11-03 00:24:07 +00002427
wdenk2729af92004-05-03 20:45:30 +00002428 etc.
wdenkc6097192002-11-03 00:24:07 +00002429
wdenkc6097192002-11-03 00:24:07 +00002430
wdenk2729af92004-05-03 20:45:30 +00002431Finally, type "make all", and you should get some working U-Boot
2432images ready for download to / installation on your system:
wdenkc6097192002-11-03 00:24:07 +00002433
wdenk2729af92004-05-03 20:45:30 +00002434- "u-boot.bin" is a raw binary image
2435- "u-boot" is an image in ELF binary format
2436- "u-boot.srec" is in Motorola S-Record format
wdenkc6097192002-11-03 00:24:07 +00002437
Marian Balakowiczbaf31242006-09-07 17:25:40 +02002438By default the build is performed locally and the objects are saved
2439in the source directory. One of the two methods can be used to change
2440this behavior and build U-Boot to some external directory:
2441
24421. Add O= to the make command line invocations:
2443
2444 make O=/tmp/build distclean
2445 make O=/tmp/build NAME_config
2446 make O=/tmp/build all
2447
24482. Set environment variable BUILD_DIR to point to the desired location:
2449
2450 export BUILD_DIR=/tmp/build
2451 make distclean
2452 make NAME_config
2453 make all
2454
2455Note that the command line "O=" setting overrides the BUILD_DIR environment
2456variable.
2457
wdenkc6097192002-11-03 00:24:07 +00002458
wdenk2729af92004-05-03 20:45:30 +00002459Please be aware that the Makefiles assume you are using GNU make, so
2460for instance on NetBSD you might need to use "gmake" instead of
2461native "make".
wdenkc6097192002-11-03 00:24:07 +00002462
wdenkc6097192002-11-03 00:24:07 +00002463
wdenk2729af92004-05-03 20:45:30 +00002464If the system board that you have is not listed, then you will need
2465to port U-Boot to your hardware platform. To do this, follow these
2466steps:
wdenkc6097192002-11-03 00:24:07 +00002467
wdenk2729af92004-05-03 20:45:30 +000024681. Add a new configuration option for your board to the toplevel
2469 "Makefile" and to the "MAKEALL" script, using the existing
2470 entries as examples. Note that here and at many other places
2471 boards and other names are listed in alphabetical sort order. Please
2472 keep this order.
24732. Create a new directory to hold your board specific code. Add any
2474 files you need. In your board directory, you will need at least
2475 the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds".
24763. Create a new configuration file "include/configs/<board>.h" for
2477 your board
24783. If you're porting U-Boot to a new CPU, then also create a new
2479 directory to hold your CPU specific code. Add any files you need.
24804. Run "make <board>_config" with your new name.
24815. Type "make", and you should get a working "u-boot.srec" file
2482 to be installed on your target system.
24836. Debug and solve any problems that might arise.
2484 [Of course, this last step is much harder than it sounds.]
wdenkc6097192002-11-03 00:24:07 +00002485
wdenkc6097192002-11-03 00:24:07 +00002486
wdenk2729af92004-05-03 20:45:30 +00002487Testing of U-Boot Modifications, Ports to New Hardware, etc.:
2488==============================================================
wdenkc6097192002-11-03 00:24:07 +00002489
wdenk2729af92004-05-03 20:45:30 +00002490If you have modified U-Boot sources (for instance added a new board
2491or support for new devices, a new CPU, etc.) you are expected to
2492provide feedback to the other developers. The feedback normally takes
2493the form of a "patch", i. e. a context diff against a certain (latest
2494official or latest in CVS) version of U-Boot sources.
wdenkc6097192002-11-03 00:24:07 +00002495
wdenk2729af92004-05-03 20:45:30 +00002496But before you submit such a patch, please verify that your modifi-
2497cation did not break existing code. At least make sure that *ALL* of
2498the supported boards compile WITHOUT ANY compiler warnings. To do so,
2499just run the "MAKEALL" script, which will configure and build U-Boot
2500for ALL supported system. Be warned, this will take a while. You can
2501select which (cross) compiler to use by passing a `CROSS_COMPILE'
2502environment variable to the script, i. e. to use the cross tools from
2503MontaVista's Hard Hat Linux you can type
wdenkc6097192002-11-03 00:24:07 +00002504
wdenk2729af92004-05-03 20:45:30 +00002505 CROSS_COMPILE=ppc_8xx- MAKEALL
wdenkc6097192002-11-03 00:24:07 +00002506
wdenk2729af92004-05-03 20:45:30 +00002507or to build on a native PowerPC system you can type
wdenkc6097192002-11-03 00:24:07 +00002508
wdenk2729af92004-05-03 20:45:30 +00002509 CROSS_COMPILE=' ' MAKEALL
wdenkc6097192002-11-03 00:24:07 +00002510
Marian Balakowiczbaf31242006-09-07 17:25:40 +02002511When using the MAKEALL script, the default behaviour is to build U-Boot
2512in the source directory. This location can be changed by setting the
2513BUILD_DIR environment variable. Also, for each target built, the MAKEALL
2514script saves two log files (<target>.ERR and <target>.MAKEALL) in the
2515<source dir>/LOG directory. This default location can be changed by
2516setting the MAKEALL_LOGDIR environment variable. For example:
2517
2518 export BUILD_DIR=/tmp/build
2519 export MAKEALL_LOGDIR=/tmp/log
2520 CROSS_COMPILE=ppc_8xx- MAKEALL
2521
2522With the above settings build objects are saved in the /tmp/build, log
2523files are saved in the /tmp/log and the source tree remains clean during
2524the whole build process.
2525
2526
wdenk2729af92004-05-03 20:45:30 +00002527See also "U-Boot Porting Guide" below.
wdenkc6097192002-11-03 00:24:07 +00002528
wdenkc6097192002-11-03 00:24:07 +00002529
wdenk2729af92004-05-03 20:45:30 +00002530Monitor Commands - Overview:
2531============================
wdenkc6097192002-11-03 00:24:07 +00002532
wdenk2729af92004-05-03 20:45:30 +00002533go - start application at address 'addr'
2534run - run commands in an environment variable
2535bootm - boot application image from memory
2536bootp - boot image via network using BootP/TFTP protocol
2537tftpboot- boot image via network using TFTP protocol
2538 and env variables "ipaddr" and "serverip"
2539 (and eventually "gatewayip")
2540rarpboot- boot image via network using RARP/TFTP protocol
2541diskboot- boot from IDE devicebootd - boot default, i.e., run 'bootcmd'
2542loads - load S-Record file over serial line
2543loadb - load binary file over serial line (kermit mode)
2544md - memory display
2545mm - memory modify (auto-incrementing)
2546nm - memory modify (constant address)
2547mw - memory write (fill)
2548cp - memory copy
2549cmp - memory compare
2550crc32 - checksum calculation
2551imd - i2c memory display
2552imm - i2c memory modify (auto-incrementing)
2553inm - i2c memory modify (constant address)
2554imw - i2c memory write (fill)
2555icrc32 - i2c checksum calculation
2556iprobe - probe to discover valid I2C chip addresses
2557iloop - infinite loop on address range
2558isdram - print SDRAM configuration information
2559sspi - SPI utility commands
2560base - print or set address offset
2561printenv- print environment variables
2562setenv - set environment variables
2563saveenv - save environment variables to persistent storage
2564protect - enable or disable FLASH write protection
2565erase - erase FLASH memory
2566flinfo - print FLASH memory information
2567bdinfo - print Board Info structure
2568iminfo - print header information for application image
2569coninfo - print console devices and informations
2570ide - IDE sub-system
2571loop - infinite loop on address range
wdenk56523f12004-07-11 17:40:54 +00002572loopw - infinite write loop on address range
wdenk2729af92004-05-03 20:45:30 +00002573mtest - simple RAM test
2574icache - enable or disable instruction cache
2575dcache - enable or disable data cache
2576reset - Perform RESET of the CPU
2577echo - echo args to console
2578version - print monitor version
2579help - print online help
2580? - alias for 'help'
wdenkc6097192002-11-03 00:24:07 +00002581
wdenkc6097192002-11-03 00:24:07 +00002582
wdenk2729af92004-05-03 20:45:30 +00002583Monitor Commands - Detailed Description:
2584========================================
wdenkc6097192002-11-03 00:24:07 +00002585
wdenk2729af92004-05-03 20:45:30 +00002586TODO.
wdenkc6097192002-11-03 00:24:07 +00002587
wdenk2729af92004-05-03 20:45:30 +00002588For now: just type "help <command>".
wdenkc6097192002-11-03 00:24:07 +00002589
2590
wdenk2729af92004-05-03 20:45:30 +00002591Environment Variables:
2592======================
wdenkc6097192002-11-03 00:24:07 +00002593
wdenk2729af92004-05-03 20:45:30 +00002594U-Boot supports user configuration using Environment Variables which
2595can be made persistent by saving to Flash memory.
wdenkc6097192002-11-03 00:24:07 +00002596
wdenk2729af92004-05-03 20:45:30 +00002597Environment Variables are set using "setenv", printed using
2598"printenv", and saved to Flash using "saveenv". Using "setenv"
2599without a value can be used to delete a variable from the
2600environment. As long as you don't save the environment you are
2601working with an in-memory copy. In case the Flash area containing the
2602environment is erased by accident, a default environment is provided.
wdenkc6097192002-11-03 00:24:07 +00002603
wdenk2729af92004-05-03 20:45:30 +00002604Some configuration options can be set using Environment Variables:
wdenkc6097192002-11-03 00:24:07 +00002605
wdenk2729af92004-05-03 20:45:30 +00002606 baudrate - see CONFIG_BAUDRATE
wdenkc6097192002-11-03 00:24:07 +00002607
wdenk2729af92004-05-03 20:45:30 +00002608 bootdelay - see CONFIG_BOOTDELAY
wdenkc6097192002-11-03 00:24:07 +00002609
wdenk2729af92004-05-03 20:45:30 +00002610 bootcmd - see CONFIG_BOOTCOMMAND
wdenkc6097192002-11-03 00:24:07 +00002611
wdenk2729af92004-05-03 20:45:30 +00002612 bootargs - Boot arguments when booting an RTOS image
wdenkc6097192002-11-03 00:24:07 +00002613
wdenk2729af92004-05-03 20:45:30 +00002614 bootfile - Name of the image to load with TFTP
wdenkc6097192002-11-03 00:24:07 +00002615
wdenk2729af92004-05-03 20:45:30 +00002616 autoload - if set to "no" (any string beginning with 'n'),
2617 "bootp" will just load perform a lookup of the
2618 configuration from the BOOTP server, but not try to
2619 load any image using TFTP
wdenkc6097192002-11-03 00:24:07 +00002620
wdenk2729af92004-05-03 20:45:30 +00002621 autostart - if set to "yes", an image loaded using the "bootp",
2622 "rarpboot", "tftpboot" or "diskboot" commands will
2623 be automatically started (by internally calling
2624 "bootm")
wdenkc6097192002-11-03 00:24:07 +00002625
wdenk2729af92004-05-03 20:45:30 +00002626 If set to "no", a standalone image passed to the
2627 "bootm" command will be copied to the load address
2628 (and eventually uncompressed), but NOT be started.
2629 This can be used to load and uncompress arbitrary
2630 data.
wdenkc6097192002-11-03 00:24:07 +00002631
wdenk17ea1172004-06-06 21:51:03 +00002632 i2cfast - (PPC405GP|PPC405EP only)
2633 if set to 'y' configures Linux I2C driver for fast
2634 mode (400kHZ). This environment variable is used in
2635 initialization code. So, for changes to be effective
2636 it must be saved and board must be reset.
2637
wdenk2729af92004-05-03 20:45:30 +00002638 initrd_high - restrict positioning of initrd images:
2639 If this variable is not set, initrd images will be
2640 copied to the highest possible address in RAM; this
2641 is usually what you want since it allows for
2642 maximum initrd size. If for some reason you want to
2643 make sure that the initrd image is loaded below the
2644 CFG_BOOTMAPSZ limit, you can set this environment
2645 variable to a value of "no" or "off" or "0".
2646 Alternatively, you can set it to a maximum upper
2647 address to use (U-Boot will still check that it
2648 does not overwrite the U-Boot stack and data).
wdenkc6097192002-11-03 00:24:07 +00002649
wdenk2729af92004-05-03 20:45:30 +00002650 For instance, when you have a system with 16 MB
2651 RAM, and want to reserve 4 MB from use by Linux,
2652 you can do this by adding "mem=12M" to the value of
2653 the "bootargs" variable. However, now you must make
2654 sure that the initrd image is placed in the first
2655 12 MB as well - this can be done with
wdenkc6097192002-11-03 00:24:07 +00002656
wdenk2729af92004-05-03 20:45:30 +00002657 setenv initrd_high 00c00000
wdenkc6097192002-11-03 00:24:07 +00002658
wdenk2729af92004-05-03 20:45:30 +00002659 If you set initrd_high to 0xFFFFFFFF, this is an
2660 indication to U-Boot that all addresses are legal
2661 for the Linux kernel, including addresses in flash
2662 memory. In this case U-Boot will NOT COPY the
2663 ramdisk at all. This may be useful to reduce the
2664 boot time on your system, but requires that this
2665 feature is supported by your Linux kernel.
wdenk4a6fd342003-04-12 23:38:12 +00002666
wdenk2729af92004-05-03 20:45:30 +00002667 ipaddr - IP address; needed for tftpboot command
wdenkc6097192002-11-03 00:24:07 +00002668
wdenk2729af92004-05-03 20:45:30 +00002669 loadaddr - Default load address for commands like "bootp",
2670 "rarpboot", "tftpboot", "loadb" or "diskboot"
wdenkc6097192002-11-03 00:24:07 +00002671
wdenk2729af92004-05-03 20:45:30 +00002672 loads_echo - see CONFIG_LOADS_ECHO
wdenkc6097192002-11-03 00:24:07 +00002673
wdenk2729af92004-05-03 20:45:30 +00002674 serverip - TFTP server IP address; needed for tftpboot command
wdenk38b99262003-05-23 23:18:21 +00002675
wdenk2729af92004-05-03 20:45:30 +00002676 bootretry - see CONFIG_BOOT_RETRY_TIME
wdenkc6097192002-11-03 00:24:07 +00002677
wdenk2729af92004-05-03 20:45:30 +00002678 bootdelaykey - see CONFIG_AUTOBOOT_DELAY_STR
wdenkc6097192002-11-03 00:24:07 +00002679
wdenk2729af92004-05-03 20:45:30 +00002680 bootstopkey - see CONFIG_AUTOBOOT_STOP_STR
wdenkc6097192002-11-03 00:24:07 +00002681
wdenk2729af92004-05-03 20:45:30 +00002682 ethprime - When CONFIG_NET_MULTI is enabled controls which
2683 interface is used first.
wdenkc6097192002-11-03 00:24:07 +00002684
wdenk2729af92004-05-03 20:45:30 +00002685 ethact - When CONFIG_NET_MULTI is enabled controls which
2686 interface is currently active. For example you
2687 can do the following
wdenkc6097192002-11-03 00:24:07 +00002688
wdenk2729af92004-05-03 20:45:30 +00002689 => setenv ethact FEC ETHERNET
2690 => ping 192.168.0.1 # traffic sent on FEC ETHERNET
2691 => setenv ethact SCC ETHERNET
2692 => ping 10.0.0.1 # traffic sent on SCC ETHERNET
wdenkc6097192002-11-03 00:24:07 +00002693
wdenk2729af92004-05-03 20:45:30 +00002694 netretry - When set to "no" each network operation will
2695 either succeed or fail without retrying.
2696 When set to "once" the network operation will
2697 fail when all the available network interfaces
2698 are tried once without success.
2699 Useful on scripts which control the retry operation
2700 themselves.
wdenkc6097192002-11-03 00:24:07 +00002701
Wolfgang Denk28cb9372005-09-24 23:25:46 +02002702 tftpsrcport - If this is set, the value is used for TFTP's
Wolfgang Denkecb0ccd2005-09-24 22:37:32 +02002703 UDP source port.
2704
Wolfgang Denk28cb9372005-09-24 23:25:46 +02002705 tftpdstport - If this is set, the value is used for TFTP's UDP
2706 destination port instead of the Well Know Port 69.
2707
wdenk2729af92004-05-03 20:45:30 +00002708 vlan - When set to a value < 4095 the traffic over
2709 ethernet is encapsulated/received over 802.1q
2710 VLAN tagged frames.
wdenka3d991b2004-04-15 21:48:45 +00002711
wdenk2729af92004-05-03 20:45:30 +00002712The following environment variables may be used and automatically
2713updated by the network boot commands ("bootp" and "rarpboot"),
2714depending the information provided by your boot server:
wdenka3d991b2004-04-15 21:48:45 +00002715
wdenk2729af92004-05-03 20:45:30 +00002716 bootfile - see above
2717 dnsip - IP address of your Domain Name Server
2718 dnsip2 - IP address of your secondary Domain Name Server
2719 gatewayip - IP address of the Gateway (Router) to use
2720 hostname - Target hostname
2721 ipaddr - see above
2722 netmask - Subnet Mask
2723 rootpath - Pathname of the root filesystem on the NFS server
2724 serverip - see above
wdenka3d991b2004-04-15 21:48:45 +00002725
wdenka3d991b2004-04-15 21:48:45 +00002726
wdenk2729af92004-05-03 20:45:30 +00002727There are two special Environment Variables:
wdenkc6097192002-11-03 00:24:07 +00002728
wdenk2729af92004-05-03 20:45:30 +00002729 serial# - contains hardware identification information such
2730 as type string and/or serial number
2731 ethaddr - Ethernet address
wdenkc6097192002-11-03 00:24:07 +00002732
wdenk2729af92004-05-03 20:45:30 +00002733These variables can be set only once (usually during manufacturing of
2734the board). U-Boot refuses to delete or overwrite these variables
2735once they have been set once.
wdenkc6097192002-11-03 00:24:07 +00002736
2737
wdenk2729af92004-05-03 20:45:30 +00002738Further special Environment Variables:
wdenkc6097192002-11-03 00:24:07 +00002739
wdenk2729af92004-05-03 20:45:30 +00002740 ver - Contains the U-Boot version string as printed
2741 with the "version" command. This variable is
2742 readonly (see CONFIG_VERSION_VARIABLE).
wdenkc6097192002-11-03 00:24:07 +00002743
wdenkc6097192002-11-03 00:24:07 +00002744
wdenk2729af92004-05-03 20:45:30 +00002745Please note that changes to some configuration parameters may take
2746only effect after the next boot (yes, that's just like Windoze :-).
wdenkc6097192002-11-03 00:24:07 +00002747
stroesec1551ea2003-04-04 15:53:41 +00002748
wdenk2729af92004-05-03 20:45:30 +00002749Command Line Parsing:
2750=====================
stroesec1551ea2003-04-04 15:53:41 +00002751
wdenk2729af92004-05-03 20:45:30 +00002752There are two different command line parsers available with U-Boot:
2753the old "simple" one, and the much more powerful "hush" shell:
stroesec1551ea2003-04-04 15:53:41 +00002754
wdenk2729af92004-05-03 20:45:30 +00002755Old, simple command line parser:
2756--------------------------------
wdenkc6097192002-11-03 00:24:07 +00002757
wdenk2729af92004-05-03 20:45:30 +00002758- supports environment variables (through setenv / saveenv commands)
2759- several commands on one line, separated by ';'
Wolfgang Denkfe126d82005-11-20 21:40:11 +01002760- variable substitution using "... ${name} ..." syntax
wdenk2729af92004-05-03 20:45:30 +00002761- special characters ('$', ';') can be escaped by prefixing with '\',
2762 for example:
Wolfgang Denkfe126d82005-11-20 21:40:11 +01002763 setenv bootcmd bootm \${address}
wdenk2729af92004-05-03 20:45:30 +00002764- You can also escape text by enclosing in single apostrophes, for example:
2765 setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off'
wdenkc6097192002-11-03 00:24:07 +00002766
wdenk2729af92004-05-03 20:45:30 +00002767Hush shell:
2768-----------
wdenkf07771c2003-05-28 08:06:31 +00002769
wdenk2729af92004-05-03 20:45:30 +00002770- similar to Bourne shell, with control structures like
2771 if...then...else...fi, for...do...done; while...do...done,
2772 until...do...done, ...
2773- supports environment ("global") variables (through setenv / saveenv
2774 commands) and local shell variables (through standard shell syntax
2775 "name=value"); only environment variables can be used with "run"
2776 command
wdenkf07771c2003-05-28 08:06:31 +00002777
wdenk2729af92004-05-03 20:45:30 +00002778General rules:
2779--------------
wdenkf07771c2003-05-28 08:06:31 +00002780
wdenk2729af92004-05-03 20:45:30 +00002781(1) If a command line (or an environment variable executed by a "run"
2782 command) contains several commands separated by semicolon, and
2783 one of these commands fails, then the remaining commands will be
2784 executed anyway.
wdenkf07771c2003-05-28 08:06:31 +00002785
wdenk2729af92004-05-03 20:45:30 +00002786(2) If you execute several variables with one call to run (i. e.
2787 calling run with a list af variables as arguments), any failing
2788 command will cause "run" to terminate, i. e. the remaining
2789 variables are not executed.
wdenkf07771c2003-05-28 08:06:31 +00002790
wdenk2729af92004-05-03 20:45:30 +00002791Note for Redundant Ethernet Interfaces:
2792=======================================
wdenkf07771c2003-05-28 08:06:31 +00002793
wdenk2729af92004-05-03 20:45:30 +00002794Some boards come with redundant ethernet interfaces; U-Boot supports
2795such configurations and is capable of automatic selection of a
2796"working" interface when needed. MAC assignment works as follows:
wdenkf07771c2003-05-28 08:06:31 +00002797
wdenk2729af92004-05-03 20:45:30 +00002798Network interfaces are numbered eth0, eth1, eth2, ... Corresponding
2799MAC addresses can be stored in the environment as "ethaddr" (=>eth0),
2800"eth1addr" (=>eth1), "eth2addr", ...
wdenkf07771c2003-05-28 08:06:31 +00002801
wdenk2729af92004-05-03 20:45:30 +00002802If the network interface stores some valid MAC address (for instance
2803in SROM), this is used as default address if there is NO correspon-
2804ding setting in the environment; if the corresponding environment
2805variable is set, this overrides the settings in the card; that means:
wdenkf07771c2003-05-28 08:06:31 +00002806
wdenk2729af92004-05-03 20:45:30 +00002807o If the SROM has a valid MAC address, and there is no address in the
2808 environment, the SROM's address is used.
wdenkc6097192002-11-03 00:24:07 +00002809
wdenk2729af92004-05-03 20:45:30 +00002810o If there is no valid address in the SROM, and a definition in the
2811 environment exists, then the value from the environment variable is
2812 used.
wdenkc6097192002-11-03 00:24:07 +00002813
wdenk2729af92004-05-03 20:45:30 +00002814o If both the SROM and the environment contain a MAC address, and
2815 both addresses are the same, this MAC address is used.
wdenkc6097192002-11-03 00:24:07 +00002816
wdenk2729af92004-05-03 20:45:30 +00002817o If both the SROM and the environment contain a MAC address, and the
2818 addresses differ, the value from the environment is used and a
2819 warning is printed.
wdenkc6097192002-11-03 00:24:07 +00002820
wdenk2729af92004-05-03 20:45:30 +00002821o If neither SROM nor the environment contain a MAC address, an error
2822 is raised.
wdenkc6097192002-11-03 00:24:07 +00002823
wdenkc6097192002-11-03 00:24:07 +00002824
wdenk2729af92004-05-03 20:45:30 +00002825Image Formats:
2826==============
wdenkc6097192002-11-03 00:24:07 +00002827
wdenk2729af92004-05-03 20:45:30 +00002828The "boot" commands of this monitor operate on "image" files which
2829can be basicly anything, preceeded by a special header; see the
2830definitions in include/image.h for details; basicly, the header
2831defines the following image properties:
wdenkc6097192002-11-03 00:24:07 +00002832
wdenk2729af92004-05-03 20:45:30 +00002833* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD,
2834 4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks,
2835 LynxOS, pSOS, QNX, RTEMS, ARTOS;
2836 Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, ARTOS, LynxOS).
Wolfgang Denk7b64fef2006-10-24 14:21:16 +02002837* Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86,
wdenk2729af92004-05-03 20:45:30 +00002838 IA64, MIPS, NIOS, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit;
Wolfgang Denk7b64fef2006-10-24 14:21:16 +02002839 Currently supported: ARM, AVR32, Intel x86, MIPS, NIOS, PowerPC).
wdenk2729af92004-05-03 20:45:30 +00002840* Compression Type (uncompressed, gzip, bzip2)
2841* Load Address
2842* Entry Point
2843* Image Name
2844* Image Timestamp
wdenkc6097192002-11-03 00:24:07 +00002845
wdenk2729af92004-05-03 20:45:30 +00002846The header is marked by a special Magic Number, and both the header
2847and the data portions of the image are secured against corruption by
2848CRC32 checksums.
wdenkc6097192002-11-03 00:24:07 +00002849
wdenkc6097192002-11-03 00:24:07 +00002850
wdenk2729af92004-05-03 20:45:30 +00002851Linux Support:
2852==============
wdenkc6097192002-11-03 00:24:07 +00002853
wdenk2729af92004-05-03 20:45:30 +00002854Although U-Boot should support any OS or standalone application
2855easily, the main focus has always been on Linux during the design of
2856U-Boot.
wdenkc6097192002-11-03 00:24:07 +00002857
wdenk2729af92004-05-03 20:45:30 +00002858U-Boot includes many features that so far have been part of some
2859special "boot loader" code within the Linux kernel. Also, any
2860"initrd" images to be used are no longer part of one big Linux image;
2861instead, kernel and "initrd" are separate images. This implementation
2862serves several purposes:
wdenkc6097192002-11-03 00:24:07 +00002863
wdenk2729af92004-05-03 20:45:30 +00002864- the same features can be used for other OS or standalone
2865 applications (for instance: using compressed images to reduce the
2866 Flash memory footprint)
wdenkc6097192002-11-03 00:24:07 +00002867
wdenk2729af92004-05-03 20:45:30 +00002868- it becomes much easier to port new Linux kernel versions because
2869 lots of low-level, hardware dependent stuff are done by U-Boot
wdenkc6097192002-11-03 00:24:07 +00002870
wdenk2729af92004-05-03 20:45:30 +00002871- the same Linux kernel image can now be used with different "initrd"
2872 images; of course this also means that different kernel images can
2873 be run with the same "initrd". This makes testing easier (you don't
2874 have to build a new "zImage.initrd" Linux image when you just
2875 change a file in your "initrd"). Also, a field-upgrade of the
2876 software is easier now.
wdenkc6097192002-11-03 00:24:07 +00002877
wdenkc6097192002-11-03 00:24:07 +00002878
wdenk2729af92004-05-03 20:45:30 +00002879Linux HOWTO:
2880============
wdenkc6097192002-11-03 00:24:07 +00002881
wdenk2729af92004-05-03 20:45:30 +00002882Porting Linux to U-Boot based systems:
2883---------------------------------------
wdenkc6097192002-11-03 00:24:07 +00002884
wdenk2729af92004-05-03 20:45:30 +00002885U-Boot cannot save you from doing all the necessary modifications to
2886configure the Linux device drivers for use with your target hardware
2887(no, we don't intend to provide a full virtual machine interface to
2888Linux :-).
wdenkc6097192002-11-03 00:24:07 +00002889
wdenk2729af92004-05-03 20:45:30 +00002890But now you can ignore ALL boot loader code (in arch/ppc/mbxboot).
wdenkc6097192002-11-03 00:24:07 +00002891
wdenk2729af92004-05-03 20:45:30 +00002892Just make sure your machine specific header file (for instance
2893include/asm-ppc/tqm8xx.h) includes the same definition of the Board
2894Information structure as we define in include/u-boot.h, and make
2895sure that your definition of IMAP_ADDR uses the same value as your
2896U-Boot configuration in CFG_IMMR.
wdenkc6097192002-11-03 00:24:07 +00002897
wdenkc6097192002-11-03 00:24:07 +00002898
wdenk2729af92004-05-03 20:45:30 +00002899Configuring the Linux kernel:
2900-----------------------------
wdenkc6097192002-11-03 00:24:07 +00002901
wdenk2729af92004-05-03 20:45:30 +00002902No specific requirements for U-Boot. Make sure you have some root
2903device (initial ramdisk, NFS) for your target system.
wdenkc6097192002-11-03 00:24:07 +00002904
wdenkc6097192002-11-03 00:24:07 +00002905
wdenk2729af92004-05-03 20:45:30 +00002906Building a Linux Image:
2907-----------------------
wdenkc6097192002-11-03 00:24:07 +00002908
wdenk2729af92004-05-03 20:45:30 +00002909With U-Boot, "normal" build targets like "zImage" or "bzImage" are
2910not used. If you use recent kernel source, a new build target
2911"uImage" will exist which automatically builds an image usable by
2912U-Boot. Most older kernels also have support for a "pImage" target,
2913which was introduced for our predecessor project PPCBoot and uses a
2914100% compatible format.
wdenkc6097192002-11-03 00:24:07 +00002915
wdenk2729af92004-05-03 20:45:30 +00002916Example:
wdenkc6097192002-11-03 00:24:07 +00002917
wdenk2729af92004-05-03 20:45:30 +00002918 make TQM850L_config
2919 make oldconfig
2920 make dep
2921 make uImage
wdenkc6097192002-11-03 00:24:07 +00002922
wdenk2729af92004-05-03 20:45:30 +00002923The "uImage" build target uses a special tool (in 'tools/mkimage') to
2924encapsulate a compressed Linux kernel image with header information,
2925CRC32 checksum etc. for use with U-Boot. This is what we are doing:
wdenkc6097192002-11-03 00:24:07 +00002926
wdenk2729af92004-05-03 20:45:30 +00002927* build a standard "vmlinux" kernel image (in ELF binary format):
wdenkc6097192002-11-03 00:24:07 +00002928
wdenk2729af92004-05-03 20:45:30 +00002929* convert the kernel into a raw binary image:
wdenkc6097192002-11-03 00:24:07 +00002930
wdenk2729af92004-05-03 20:45:30 +00002931 ${CROSS_COMPILE}-objcopy -O binary \
2932 -R .note -R .comment \
2933 -S vmlinux linux.bin
wdenkc6097192002-11-03 00:24:07 +00002934
wdenk2729af92004-05-03 20:45:30 +00002935* compress the binary image:
wdenkc6097192002-11-03 00:24:07 +00002936
wdenk2729af92004-05-03 20:45:30 +00002937 gzip -9 linux.bin
wdenkc6097192002-11-03 00:24:07 +00002938
wdenk2729af92004-05-03 20:45:30 +00002939* package compressed binary image for U-Boot:
wdenk24ee89b2002-11-03 17:56:27 +00002940
wdenk2729af92004-05-03 20:45:30 +00002941 mkimage -A ppc -O linux -T kernel -C gzip \
2942 -a 0 -e 0 -n "Linux Kernel Image" \
2943 -d linux.bin.gz uImage
wdenk24ee89b2002-11-03 17:56:27 +00002944
wdenk24ee89b2002-11-03 17:56:27 +00002945
wdenk2729af92004-05-03 20:45:30 +00002946The "mkimage" tool can also be used to create ramdisk images for use
2947with U-Boot, either separated from the Linux kernel image, or
2948combined into one file. "mkimage" encapsulates the images with a 64
2949byte header containing information about target architecture,
2950operating system, image type, compression method, entry points, time
2951stamp, CRC32 checksums, etc.
wdenk24ee89b2002-11-03 17:56:27 +00002952
wdenk2729af92004-05-03 20:45:30 +00002953"mkimage" can be called in two ways: to verify existing images and
2954print the header information, or to build new images.
wdenk24ee89b2002-11-03 17:56:27 +00002955
wdenk2729af92004-05-03 20:45:30 +00002956In the first form (with "-l" option) mkimage lists the information
2957contained in the header of an existing U-Boot image; this includes
2958checksum verification:
wdenk24ee89b2002-11-03 17:56:27 +00002959
wdenk2729af92004-05-03 20:45:30 +00002960 tools/mkimage -l image
2961 -l ==> list image header information
wdenk24ee89b2002-11-03 17:56:27 +00002962
wdenk2729af92004-05-03 20:45:30 +00002963The second form (with "-d" option) is used to build a U-Boot image
2964from a "data file" which is used as image payload:
wdenk24ee89b2002-11-03 17:56:27 +00002965
wdenk2729af92004-05-03 20:45:30 +00002966 tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \
2967 -n name -d data_file image
2968 -A ==> set architecture to 'arch'
2969 -O ==> set operating system to 'os'
2970 -T ==> set image type to 'type'
2971 -C ==> set compression type 'comp'
2972 -a ==> set load address to 'addr' (hex)
2973 -e ==> set entry point to 'ep' (hex)
2974 -n ==> set image name to 'name'
2975 -d ==> use image data from 'datafile'
wdenk24ee89b2002-11-03 17:56:27 +00002976
wdenk69459792004-05-29 16:53:29 +00002977Right now, all Linux kernels for PowerPC systems use the same load
2978address (0x00000000), but the entry point address depends on the
2979kernel version:
wdenkc6097192002-11-03 00:24:07 +00002980
wdenk2729af92004-05-03 20:45:30 +00002981- 2.2.x kernels have the entry point at 0x0000000C,
2982- 2.3.x and later kernels have the entry point at 0x00000000.
wdenkc6097192002-11-03 00:24:07 +00002983
wdenk2729af92004-05-03 20:45:30 +00002984So a typical call to build a U-Boot image would read:
wdenkc6097192002-11-03 00:24:07 +00002985
wdenk2729af92004-05-03 20:45:30 +00002986 -> tools/mkimage -n '2.4.4 kernel for TQM850L' \
2987 > -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \
2988 > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux.gz \
2989 > examples/uImage.TQM850L
2990 Image Name: 2.4.4 kernel for TQM850L
2991 Created: Wed Jul 19 02:34:59 2000
2992 Image Type: PowerPC Linux Kernel Image (gzip compressed)
2993 Data Size: 335725 Bytes = 327.86 kB = 0.32 MB
2994 Load Address: 0x00000000
2995 Entry Point: 0x00000000
wdenkc6097192002-11-03 00:24:07 +00002996
wdenk2729af92004-05-03 20:45:30 +00002997To verify the contents of the image (or check for corruption):
wdenkc6097192002-11-03 00:24:07 +00002998
wdenk2729af92004-05-03 20:45:30 +00002999 -> tools/mkimage -l examples/uImage.TQM850L
3000 Image Name: 2.4.4 kernel for TQM850L
3001 Created: Wed Jul 19 02:34:59 2000
3002 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3003 Data Size: 335725 Bytes = 327.86 kB = 0.32 MB
3004 Load Address: 0x00000000
3005 Entry Point: 0x00000000
wdenkc6097192002-11-03 00:24:07 +00003006
wdenk2729af92004-05-03 20:45:30 +00003007NOTE: for embedded systems where boot time is critical you can trade
3008speed for memory and install an UNCOMPRESSED image instead: this
3009needs more space in Flash, but boots much faster since it does not
3010need to be uncompressed:
wdenkc6097192002-11-03 00:24:07 +00003011
wdenk2729af92004-05-03 20:45:30 +00003012 -> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux.gz
3013 -> tools/mkimage -n '2.4.4 kernel for TQM850L' \
3014 > -A ppc -O linux -T kernel -C none -a 0 -e 0 \
3015 > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux \
3016 > examples/uImage.TQM850L-uncompressed
3017 Image Name: 2.4.4 kernel for TQM850L
3018 Created: Wed Jul 19 02:34:59 2000
3019 Image Type: PowerPC Linux Kernel Image (uncompressed)
3020 Data Size: 792160 Bytes = 773.59 kB = 0.76 MB
3021 Load Address: 0x00000000
3022 Entry Point: 0x00000000
wdenkc6097192002-11-03 00:24:07 +00003023
wdenkc6097192002-11-03 00:24:07 +00003024
wdenk2729af92004-05-03 20:45:30 +00003025Similar you can build U-Boot images from a 'ramdisk.image.gz' file
3026when your kernel is intended to use an initial ramdisk:
wdenkdb01a2e2004-04-15 23:14:49 +00003027
wdenk2729af92004-05-03 20:45:30 +00003028 -> tools/mkimage -n 'Simple Ramdisk Image' \
3029 > -A ppc -O linux -T ramdisk -C gzip \
3030 > -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd
3031 Image Name: Simple Ramdisk Image
3032 Created: Wed Jan 12 14:01:50 2000
3033 Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
3034 Data Size: 566530 Bytes = 553.25 kB = 0.54 MB
3035 Load Address: 0x00000000
3036 Entry Point: 0x00000000
wdenkdb01a2e2004-04-15 23:14:49 +00003037
wdenkdb01a2e2004-04-15 23:14:49 +00003038
wdenk2729af92004-05-03 20:45:30 +00003039Installing a Linux Image:
3040-------------------------
wdenkdb01a2e2004-04-15 23:14:49 +00003041
wdenk2729af92004-05-03 20:45:30 +00003042To downloading a U-Boot image over the serial (console) interface,
3043you must convert the image to S-Record format:
wdenkdb01a2e2004-04-15 23:14:49 +00003044
wdenk2729af92004-05-03 20:45:30 +00003045 objcopy -I binary -O srec examples/image examples/image.srec
wdenkdb01a2e2004-04-15 23:14:49 +00003046
wdenk2729af92004-05-03 20:45:30 +00003047The 'objcopy' does not understand the information in the U-Boot
3048image header, so the resulting S-Record file will be relative to
3049address 0x00000000. To load it to a given address, you need to
3050specify the target address as 'offset' parameter with the 'loads'
3051command.
wdenkc6097192002-11-03 00:24:07 +00003052
wdenk2729af92004-05-03 20:45:30 +00003053Example: install the image to address 0x40100000 (which on the
3054TQM8xxL is in the first Flash bank):
wdenkc6097192002-11-03 00:24:07 +00003055
wdenk2729af92004-05-03 20:45:30 +00003056 => erase 40100000 401FFFFF
wdenkc6097192002-11-03 00:24:07 +00003057
wdenk2729af92004-05-03 20:45:30 +00003058 .......... done
3059 Erased 8 sectors
wdenkc6097192002-11-03 00:24:07 +00003060
wdenk2729af92004-05-03 20:45:30 +00003061 => loads 40100000
3062 ## Ready for S-Record download ...
3063 ~>examples/image.srec
3064 1 2 3 4 5 6 7 8 9 10 11 12 13 ...
3065 ...
3066 15989 15990 15991 15992
3067 [file transfer complete]
3068 [connected]
3069 ## Start Addr = 0x00000000
wdenkc6097192002-11-03 00:24:07 +00003070
3071
wdenk2729af92004-05-03 20:45:30 +00003072You can check the success of the download using the 'iminfo' command;
3073this includes a checksum verification so you can be sure no data
3074corruption happened:
wdenkc6097192002-11-03 00:24:07 +00003075
wdenk2729af92004-05-03 20:45:30 +00003076 => imi 40100000
wdenkc6097192002-11-03 00:24:07 +00003077
wdenk2729af92004-05-03 20:45:30 +00003078 ## Checking Image at 40100000 ...
3079 Image Name: 2.2.13 for initrd on TQM850L
3080 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3081 Data Size: 335725 Bytes = 327 kB = 0 MB
3082 Load Address: 00000000
3083 Entry Point: 0000000c
3084 Verifying Checksum ... OK
wdenkc6097192002-11-03 00:24:07 +00003085
3086
wdenk2729af92004-05-03 20:45:30 +00003087Boot Linux:
3088-----------
wdenkc6097192002-11-03 00:24:07 +00003089
wdenk2729af92004-05-03 20:45:30 +00003090The "bootm" command is used to boot an application that is stored in
3091memory (RAM or Flash). In case of a Linux kernel image, the contents
3092of the "bootargs" environment variable is passed to the kernel as
3093parameters. You can check and modify this variable using the
3094"printenv" and "setenv" commands:
wdenkc6097192002-11-03 00:24:07 +00003095
3096
wdenk2729af92004-05-03 20:45:30 +00003097 => printenv bootargs
3098 bootargs=root=/dev/ram
wdenkc6097192002-11-03 00:24:07 +00003099
wdenk2729af92004-05-03 20:45:30 +00003100 => setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
wdenkc6097192002-11-03 00:24:07 +00003101
wdenk2729af92004-05-03 20:45:30 +00003102 => printenv bootargs
3103 bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
wdenkc6097192002-11-03 00:24:07 +00003104
wdenk2729af92004-05-03 20:45:30 +00003105 => bootm 40020000
3106 ## Booting Linux kernel at 40020000 ...
3107 Image Name: 2.2.13 for NFS on TQM850L
3108 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3109 Data Size: 381681 Bytes = 372 kB = 0 MB
3110 Load Address: 00000000
3111 Entry Point: 0000000c
3112 Verifying Checksum ... OK
3113 Uncompressing Kernel Image ... OK
3114 Linux version 2.2.13 (wd@denx.local.net) (gcc version 2.95.2 19991024 (release)) #1 Wed Jul 19 02:35:17 MEST 2000
3115 Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
3116 time_init: decrementer frequency = 187500000/60
3117 Calibrating delay loop... 49.77 BogoMIPS
3118 Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000]
3119 ...
wdenkc6097192002-11-03 00:24:07 +00003120
wdenk2729af92004-05-03 20:45:30 +00003121If you want to boot a Linux kernel with initial ram disk, you pass
3122the memory addresses of both the kernel and the initrd image (PPBCOOT
3123format!) to the "bootm" command:
wdenkc6097192002-11-03 00:24:07 +00003124
wdenk2729af92004-05-03 20:45:30 +00003125 => imi 40100000 40200000
wdenkc6097192002-11-03 00:24:07 +00003126
wdenk2729af92004-05-03 20:45:30 +00003127 ## Checking Image at 40100000 ...
3128 Image Name: 2.2.13 for initrd on TQM850L
3129 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3130 Data Size: 335725 Bytes = 327 kB = 0 MB
3131 Load Address: 00000000
3132 Entry Point: 0000000c
3133 Verifying Checksum ... OK
wdenkc6097192002-11-03 00:24:07 +00003134
wdenk2729af92004-05-03 20:45:30 +00003135 ## Checking Image at 40200000 ...
3136 Image Name: Simple Ramdisk Image
3137 Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
3138 Data Size: 566530 Bytes = 553 kB = 0 MB
3139 Load Address: 00000000
3140 Entry Point: 00000000
3141 Verifying Checksum ... OK
wdenkc6097192002-11-03 00:24:07 +00003142
wdenk2729af92004-05-03 20:45:30 +00003143 => bootm 40100000 40200000
3144 ## Booting Linux kernel at 40100000 ...
3145 Image Name: 2.2.13 for initrd on TQM850L
3146 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3147 Data Size: 335725 Bytes = 327 kB = 0 MB
3148 Load Address: 00000000
3149 Entry Point: 0000000c
3150 Verifying Checksum ... OK
3151 Uncompressing Kernel Image ... OK
3152 ## Loading RAMDisk Image at 40200000 ...
3153 Image Name: Simple Ramdisk Image
3154 Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
3155 Data Size: 566530 Bytes = 553 kB = 0 MB
3156 Load Address: 00000000
3157 Entry Point: 00000000
3158 Verifying Checksum ... OK
3159 Loading Ramdisk ... OK
3160 Linux version 2.2.13 (wd@denx.local.net) (gcc version 2.95.2 19991024 (release)) #1 Wed Jul 19 02:32:08 MEST 2000
3161 Boot arguments: root=/dev/ram
3162 time_init: decrementer frequency = 187500000/60
3163 Calibrating delay loop... 49.77 BogoMIPS
3164 ...
3165 RAMDISK: Compressed image found at block 0
3166 VFS: Mounted root (ext2 filesystem).
wdenkc6097192002-11-03 00:24:07 +00003167
wdenk2729af92004-05-03 20:45:30 +00003168 bash#
wdenkc6097192002-11-03 00:24:07 +00003169
Matthew McClintock02677682006-06-28 10:41:37 -05003170Boot Linux and pass a flat device tree:
3171-----------
3172
3173First, U-Boot must be compiled with the appropriate defines. See the section
3174titled "Linux Kernel Interface" above for a more in depth explanation. The
3175following is an example of how to start a kernel and pass an updated
3176flat device tree:
3177
3178=> print oftaddr
3179oftaddr=0x300000
3180=> print oft
3181oft=oftrees/mpc8540ads.dtb
3182=> tftp $oftaddr $oft
3183Speed: 1000, full duplex
3184Using TSEC0 device
3185TFTP from server 192.168.1.1; our IP address is 192.168.1.101
3186Filename 'oftrees/mpc8540ads.dtb'.
3187Load address: 0x300000
3188Loading: #
3189done
3190Bytes transferred = 4106 (100a hex)
3191=> tftp $loadaddr $bootfile
3192Speed: 1000, full duplex
3193Using TSEC0 device
3194TFTP from server 192.168.1.1; our IP address is 192.168.1.2
3195Filename 'uImage'.
3196Load address: 0x200000
3197Loading:############
3198done
3199Bytes transferred = 1029407 (fb51f hex)
3200=> print loadaddr
3201loadaddr=200000
3202=> print oftaddr
3203oftaddr=0x300000
3204=> bootm $loadaddr - $oftaddr
3205## Booting image at 00200000 ...
Wolfgang Denka9398e02006-11-27 15:32:42 +01003206 Image Name: Linux-2.6.17-dirty
3207 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3208 Data Size: 1029343 Bytes = 1005.2 kB
Matthew McClintock02677682006-06-28 10:41:37 -05003209 Load Address: 00000000
Wolfgang Denka9398e02006-11-27 15:32:42 +01003210 Entry Point: 00000000
Matthew McClintock02677682006-06-28 10:41:37 -05003211 Verifying Checksum ... OK
3212 Uncompressing Kernel Image ... OK
3213Booting using flat device tree at 0x300000
3214Using MPC85xx ADS machine description
3215Memory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb
3216[snip]
3217
3218
wdenk2729af92004-05-03 20:45:30 +00003219More About U-Boot Image Types:
3220------------------------------
wdenk6069ff22003-02-28 00:49:47 +00003221
wdenk2729af92004-05-03 20:45:30 +00003222U-Boot supports the following image types:
wdenk6069ff22003-02-28 00:49:47 +00003223
wdenk2729af92004-05-03 20:45:30 +00003224 "Standalone Programs" are directly runnable in the environment
3225 provided by U-Boot; it is expected that (if they behave
3226 well) you can continue to work in U-Boot after return from
3227 the Standalone Program.
3228 "OS Kernel Images" are usually images of some Embedded OS which
3229 will take over control completely. Usually these programs
3230 will install their own set of exception handlers, device
3231 drivers, set up the MMU, etc. - this means, that you cannot
3232 expect to re-enter U-Boot except by resetting the CPU.
3233 "RAMDisk Images" are more or less just data blocks, and their
3234 parameters (address, size) are passed to an OS kernel that is
3235 being started.
3236 "Multi-File Images" contain several images, typically an OS
3237 (Linux) kernel image and one or more data images like
3238 RAMDisks. This construct is useful for instance when you want
3239 to boot over the network using BOOTP etc., where the boot
3240 server provides just a single image file, but you want to get
3241 for instance an OS kernel and a RAMDisk image.
stroesec1551ea2003-04-04 15:53:41 +00003242
wdenk2729af92004-05-03 20:45:30 +00003243 "Multi-File Images" start with a list of image sizes, each
3244 image size (in bytes) specified by an "uint32_t" in network
3245 byte order. This list is terminated by an "(uint32_t)0".
3246 Immediately after the terminating 0 follow the images, one by
3247 one, all aligned on "uint32_t" boundaries (size rounded up to
3248 a multiple of 4 bytes).
stroesec1551ea2003-04-04 15:53:41 +00003249
wdenk2729af92004-05-03 20:45:30 +00003250 "Firmware Images" are binary images containing firmware (like
3251 U-Boot or FPGA images) which usually will be programmed to
3252 flash memory.
stroesec1551ea2003-04-04 15:53:41 +00003253
wdenk2729af92004-05-03 20:45:30 +00003254 "Script files" are command sequences that will be executed by
3255 U-Boot's command interpreter; this feature is especially
3256 useful when you configure U-Boot to use a real shell (hush)
3257 as command interpreter.
wdenk6069ff22003-02-28 00:49:47 +00003258
wdenkc6097192002-11-03 00:24:07 +00003259
wdenk2729af92004-05-03 20:45:30 +00003260Standalone HOWTO:
3261=================
wdenkc6097192002-11-03 00:24:07 +00003262
wdenk2729af92004-05-03 20:45:30 +00003263One of the features of U-Boot is that you can dynamically load and
3264run "standalone" applications, which can use some resources of
3265U-Boot like console I/O functions or interrupt services.
wdenkc6097192002-11-03 00:24:07 +00003266
wdenk2729af92004-05-03 20:45:30 +00003267Two simple examples are included with the sources:
wdenkc6097192002-11-03 00:24:07 +00003268
wdenk2729af92004-05-03 20:45:30 +00003269"Hello World" Demo:
3270-------------------
wdenkc6097192002-11-03 00:24:07 +00003271
wdenk2729af92004-05-03 20:45:30 +00003272'examples/hello_world.c' contains a small "Hello World" Demo
3273application; it is automatically compiled when you build U-Boot.
3274It's configured to run at address 0x00040004, so you can play with it
3275like that:
wdenkc6097192002-11-03 00:24:07 +00003276
wdenk2729af92004-05-03 20:45:30 +00003277 => loads
3278 ## Ready for S-Record download ...
3279 ~>examples/hello_world.srec
3280 1 2 3 4 5 6 7 8 9 10 11 ...
3281 [file transfer complete]
3282 [connected]
3283 ## Start Addr = 0x00040004
wdenkc6097192002-11-03 00:24:07 +00003284
wdenk2729af92004-05-03 20:45:30 +00003285 => go 40004 Hello World! This is a test.
3286 ## Starting application at 0x00040004 ...
3287 Hello World
3288 argc = 7
3289 argv[0] = "40004"
3290 argv[1] = "Hello"
3291 argv[2] = "World!"
3292 argv[3] = "This"
3293 argv[4] = "is"
3294 argv[5] = "a"
3295 argv[6] = "test."
3296 argv[7] = "<NULL>"
3297 Hit any key to exit ...
wdenkc6097192002-11-03 00:24:07 +00003298
wdenk2729af92004-05-03 20:45:30 +00003299 ## Application terminated, rc = 0x0
wdenkc6097192002-11-03 00:24:07 +00003300
wdenk2729af92004-05-03 20:45:30 +00003301Another example, which demonstrates how to register a CPM interrupt
3302handler with the U-Boot code, can be found in 'examples/timer.c'.
3303Here, a CPM timer is set up to generate an interrupt every second.
3304The interrupt service routine is trivial, just printing a '.'
3305character, but this is just a demo program. The application can be
3306controlled by the following keys:
wdenkc6097192002-11-03 00:24:07 +00003307
wdenk2729af92004-05-03 20:45:30 +00003308 ? - print current values og the CPM Timer registers
3309 b - enable interrupts and start timer
3310 e - stop timer and disable interrupts
3311 q - quit application
wdenkc6097192002-11-03 00:24:07 +00003312
wdenk2729af92004-05-03 20:45:30 +00003313 => loads
3314 ## Ready for S-Record download ...
3315 ~>examples/timer.srec
3316 1 2 3 4 5 6 7 8 9 10 11 ...
3317 [file transfer complete]
3318 [connected]
3319 ## Start Addr = 0x00040004
wdenkc6097192002-11-03 00:24:07 +00003320
wdenk2729af92004-05-03 20:45:30 +00003321 => go 40004
3322 ## Starting application at 0x00040004 ...
3323 TIMERS=0xfff00980
3324 Using timer 1
3325 tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0
wdenkc6097192002-11-03 00:24:07 +00003326
wdenk2729af92004-05-03 20:45:30 +00003327Hit 'b':
3328 [q, b, e, ?] Set interval 1000000 us
3329 Enabling timer
3330Hit '?':
3331 [q, b, e, ?] ........
3332 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0
3333Hit '?':
3334 [q, b, e, ?] .
3335 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0
3336Hit '?':
3337 [q, b, e, ?] .
3338 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0
3339Hit '?':
3340 [q, b, e, ?] .
3341 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0
3342Hit 'e':
3343 [q, b, e, ?] ...Stopping timer
3344Hit 'q':
3345 [q, b, e, ?] ## Application terminated, rc = 0x0
wdenkc6097192002-11-03 00:24:07 +00003346
3347
wdenk2729af92004-05-03 20:45:30 +00003348Minicom warning:
3349================
wdenk85ec0bc2003-03-31 16:34:49 +00003350
wdenk2729af92004-05-03 20:45:30 +00003351Over time, many people have reported problems when trying to use the
3352"minicom" terminal emulation program for serial download. I (wd)
3353consider minicom to be broken, and recommend not to use it. Under
3354Unix, I recommend to use C-Kermit for general purpose use (and
3355especially for kermit binary protocol download ("loadb" command), and
3356use "cu" for S-Record download ("loads" command).
wdenk85ec0bc2003-03-31 16:34:49 +00003357
wdenk2729af92004-05-03 20:45:30 +00003358Nevertheless, if you absolutely want to use it try adding this
3359configuration to your "File transfer protocols" section:
wdenk52f52c12003-06-19 23:04:19 +00003360
wdenk2729af92004-05-03 20:45:30 +00003361 Name Program Name U/D FullScr IO-Red. Multi
3362 X kermit /usr/bin/kermit -i -l %l -s Y U Y N N
3363 Y kermit /usr/bin/kermit -i -l %l -r N D Y N N
wdenk52f52c12003-06-19 23:04:19 +00003364
3365
wdenk2729af92004-05-03 20:45:30 +00003366NetBSD Notes:
3367=============
wdenkc6097192002-11-03 00:24:07 +00003368
wdenk2729af92004-05-03 20:45:30 +00003369Starting at version 0.9.2, U-Boot supports NetBSD both as host
3370(build U-Boot) and target system (boots NetBSD/mpc8xx).
wdenkc6097192002-11-03 00:24:07 +00003371
wdenk2729af92004-05-03 20:45:30 +00003372Building requires a cross environment; it is known to work on
3373NetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also
3374need gmake since the Makefiles are not compatible with BSD make).
3375Note that the cross-powerpc package does not install include files;
3376attempting to build U-Boot will fail because <machine/ansi.h> is
3377missing. This file has to be installed and patched manually:
wdenkc6097192002-11-03 00:24:07 +00003378
wdenk2729af92004-05-03 20:45:30 +00003379 # cd /usr/pkg/cross/powerpc-netbsd/include
3380 # mkdir powerpc
3381 # ln -s powerpc machine
3382 # cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h
3383 # ${EDIT} powerpc/ansi.h ## must remove __va_list, _BSD_VA_LIST
wdenkc6097192002-11-03 00:24:07 +00003384
wdenk2729af92004-05-03 20:45:30 +00003385Native builds *don't* work due to incompatibilities between native
3386and U-Boot include files.
wdenkc6097192002-11-03 00:24:07 +00003387
wdenk2729af92004-05-03 20:45:30 +00003388Booting assumes that (the first part of) the image booted is a
3389stage-2 loader which in turn loads and then invokes the kernel
3390proper. Loader sources will eventually appear in the NetBSD source
3391tree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the
wdenk2a8af182005-04-13 10:02:42 +00003392meantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz
wdenkc6097192002-11-03 00:24:07 +00003393
3394
wdenk2729af92004-05-03 20:45:30 +00003395Implementation Internals:
3396=========================
wdenkc6097192002-11-03 00:24:07 +00003397
wdenk2729af92004-05-03 20:45:30 +00003398The following is not intended to be a complete description of every
3399implementation detail. However, it should help to understand the
3400inner workings of U-Boot and make it easier to port it to custom
3401hardware.
wdenkc6097192002-11-03 00:24:07 +00003402
3403
wdenk2729af92004-05-03 20:45:30 +00003404Initial Stack, Global Data:
3405---------------------------
wdenkc6097192002-11-03 00:24:07 +00003406
wdenk2729af92004-05-03 20:45:30 +00003407The implementation of U-Boot is complicated by the fact that U-Boot
3408starts running out of ROM (flash memory), usually without access to
3409system RAM (because the memory controller is not initialized yet).
3410This means that we don't have writable Data or BSS segments, and BSS
3411is not initialized as zero. To be able to get a C environment working
3412at all, we have to allocate at least a minimal stack. Implementation
3413options for this are defined and restricted by the CPU used: Some CPU
3414models provide on-chip memory (like the IMMR area on MPC8xx and
3415MPC826x processors), on others (parts of) the data cache can be
3416locked as (mis-) used as memory, etc.
wdenkc6097192002-11-03 00:24:07 +00003417
wdenk2729af92004-05-03 20:45:30 +00003418 Chris Hallinan posted a good summary of these issues to the
3419 u-boot-users mailing list:
wdenk43d96162003-03-06 00:02:04 +00003420
wdenk2729af92004-05-03 20:45:30 +00003421 Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)?
3422 From: "Chris Hallinan" <clh@net1plus.com>
3423 Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET)
3424 ...
wdenk43d96162003-03-06 00:02:04 +00003425
wdenk2729af92004-05-03 20:45:30 +00003426 Correct me if I'm wrong, folks, but the way I understand it
3427 is this: Using DCACHE as initial RAM for Stack, etc, does not
3428 require any physical RAM backing up the cache. The cleverness
3429 is that the cache is being used as a temporary supply of
3430 necessary storage before the SDRAM controller is setup. It's
3431 beyond the scope of this list to expain the details, but you
3432 can see how this works by studying the cache architecture and
3433 operation in the architecture and processor-specific manuals.
wdenk43d96162003-03-06 00:02:04 +00003434
wdenk2729af92004-05-03 20:45:30 +00003435 OCM is On Chip Memory, which I believe the 405GP has 4K. It
3436 is another option for the system designer to use as an
3437 initial stack/ram area prior to SDRAM being available. Either
3438 option should work for you. Using CS 4 should be fine if your
3439 board designers haven't used it for something that would
3440 cause you grief during the initial boot! It is frequently not
3441 used.
wdenk43d96162003-03-06 00:02:04 +00003442
wdenk2729af92004-05-03 20:45:30 +00003443 CFG_INIT_RAM_ADDR should be somewhere that won't interfere
3444 with your processor/board/system design. The default value
3445 you will find in any recent u-boot distribution in
Stefan Roese8a316c92005-08-01 16:49:12 +02003446 walnut.h should work for you. I'd set it to a value larger
wdenk2729af92004-05-03 20:45:30 +00003447 than your SDRAM module. If you have a 64MB SDRAM module, set
3448 it above 400_0000. Just make sure your board has no resources
3449 that are supposed to respond to that address! That code in
3450 start.S has been around a while and should work as is when
3451 you get the config right.
wdenk43d96162003-03-06 00:02:04 +00003452
wdenk2729af92004-05-03 20:45:30 +00003453 -Chris Hallinan
3454 DS4.COM, Inc.
wdenk43d96162003-03-06 00:02:04 +00003455
wdenk2729af92004-05-03 20:45:30 +00003456It is essential to remember this, since it has some impact on the C
3457code for the initialization procedures:
wdenkc6097192002-11-03 00:24:07 +00003458
wdenk2729af92004-05-03 20:45:30 +00003459* Initialized global data (data segment) is read-only. Do not attempt
3460 to write it.
wdenkc6097192002-11-03 00:24:07 +00003461
wdenk2729af92004-05-03 20:45:30 +00003462* Do not use any unitialized global data (or implicitely initialized
3463 as zero data - BSS segment) at all - this is undefined, initiali-
3464 zation is performed later (when relocating to RAM).
wdenkc6097192002-11-03 00:24:07 +00003465
wdenk2729af92004-05-03 20:45:30 +00003466* Stack space is very limited. Avoid big data buffers or things like
3467 that.
wdenkc6097192002-11-03 00:24:07 +00003468
wdenk2729af92004-05-03 20:45:30 +00003469Having only the stack as writable memory limits means we cannot use
3470normal global data to share information beween the code. But it
3471turned out that the implementation of U-Boot can be greatly
3472simplified by making a global data structure (gd_t) available to all
3473functions. We could pass a pointer to this data as argument to _all_
3474functions, but this would bloat the code. Instead we use a feature of
3475the GCC compiler (Global Register Variables) to share the data: we
3476place a pointer (gd) to the global data into a register which we
3477reserve for this purpose.
wdenkc6097192002-11-03 00:24:07 +00003478
wdenk2729af92004-05-03 20:45:30 +00003479When choosing a register for such a purpose we are restricted by the
3480relevant (E)ABI specifications for the current architecture, and by
3481GCC's implementation.
wdenkc6097192002-11-03 00:24:07 +00003482
wdenk2729af92004-05-03 20:45:30 +00003483For PowerPC, the following registers have specific use:
3484 R1: stack pointer
3485 R2: TOC pointer
3486 R3-R4: parameter passing and return values
3487 R5-R10: parameter passing
3488 R13: small data area pointer
3489 R30: GOT pointer
3490 R31: frame pointer
wdenkc6097192002-11-03 00:24:07 +00003491
wdenk2729af92004-05-03 20:45:30 +00003492 (U-Boot also uses R14 as internal GOT pointer.)
wdenkc6097192002-11-03 00:24:07 +00003493
wdenk2729af92004-05-03 20:45:30 +00003494 ==> U-Boot will use R29 to hold a pointer to the global data
wdenkc6097192002-11-03 00:24:07 +00003495
wdenk2729af92004-05-03 20:45:30 +00003496 Note: on PPC, we could use a static initializer (since the
3497 address of the global data structure is known at compile time),
3498 but it turned out that reserving a register results in somewhat
3499 smaller code - although the code savings are not that big (on
3500 average for all boards 752 bytes for the whole U-Boot image,
3501 624 text + 127 data).
wdenkc6097192002-11-03 00:24:07 +00003502
wdenk2729af92004-05-03 20:45:30 +00003503On ARM, the following registers are used:
wdenkc6097192002-11-03 00:24:07 +00003504
wdenk2729af92004-05-03 20:45:30 +00003505 R0: function argument word/integer result
3506 R1-R3: function argument word
3507 R9: GOT pointer
3508 R10: stack limit (used only if stack checking if enabled)
3509 R11: argument (frame) pointer
3510 R12: temporary workspace
3511 R13: stack pointer
3512 R14: link register
3513 R15: program counter
wdenkc6097192002-11-03 00:24:07 +00003514
wdenk2729af92004-05-03 20:45:30 +00003515 ==> U-Boot will use R8 to hold a pointer to the global data
wdenkc6097192002-11-03 00:24:07 +00003516
Wolfgang Denkd87080b2006-03-31 18:32:53 +02003517NOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope,
3518or current versions of GCC may "optimize" the code too much.
wdenkc6097192002-11-03 00:24:07 +00003519
wdenk2729af92004-05-03 20:45:30 +00003520Memory Management:
3521------------------
wdenkc6097192002-11-03 00:24:07 +00003522
wdenk2729af92004-05-03 20:45:30 +00003523U-Boot runs in system state and uses physical addresses, i.e. the
3524MMU is not used either for address mapping nor for memory protection.
wdenkc6097192002-11-03 00:24:07 +00003525
wdenk2729af92004-05-03 20:45:30 +00003526The available memory is mapped to fixed addresses using the memory
3527controller. In this process, a contiguous block is formed for each
3528memory type (Flash, SDRAM, SRAM), even when it consists of several
3529physical memory banks.
wdenkc6097192002-11-03 00:24:07 +00003530
wdenk2729af92004-05-03 20:45:30 +00003531U-Boot is installed in the first 128 kB of the first Flash bank (on
3532TQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After
3533booting and sizing and initializing DRAM, the code relocates itself
3534to the upper end of DRAM. Immediately below the U-Boot code some
3535memory is reserved for use by malloc() [see CFG_MALLOC_LEN
3536configuration setting]. Below that, a structure with global Board
3537Info data is placed, followed by the stack (growing downward).
wdenkc6097192002-11-03 00:24:07 +00003538
wdenk2729af92004-05-03 20:45:30 +00003539Additionally, some exception handler code is copied to the low 8 kB
3540of DRAM (0x00000000 ... 0x00001FFF).
wdenkc6097192002-11-03 00:24:07 +00003541
wdenk2729af92004-05-03 20:45:30 +00003542So a typical memory configuration with 16 MB of DRAM could look like
3543this:
wdenkc6097192002-11-03 00:24:07 +00003544
wdenk2729af92004-05-03 20:45:30 +00003545 0x0000 0000 Exception Vector code
3546 :
3547 0x0000 1FFF
3548 0x0000 2000 Free for Application Use
3549 :
3550 :
wdenkc6097192002-11-03 00:24:07 +00003551
wdenk2729af92004-05-03 20:45:30 +00003552 :
3553 :
3554 0x00FB FF20 Monitor Stack (Growing downward)
3555 0x00FB FFAC Board Info Data and permanent copy of global data
3556 0x00FC 0000 Malloc Arena
3557 :
3558 0x00FD FFFF
3559 0x00FE 0000 RAM Copy of Monitor Code
3560 ... eventually: LCD or video framebuffer
3561 ... eventually: pRAM (Protected RAM - unchanged by reset)
3562 0x00FF FFFF [End of RAM]
wdenkc6097192002-11-03 00:24:07 +00003563
3564
wdenk2729af92004-05-03 20:45:30 +00003565System Initialization:
3566----------------------
wdenkc6097192002-11-03 00:24:07 +00003567
wdenk2729af92004-05-03 20:45:30 +00003568In the reset configuration, U-Boot starts at the reset entry point
3569(on most PowerPC systens at address 0x00000100). Because of the reset
3570configuration for CS0# this is a mirror of the onboard Flash memory.
3571To be able to re-map memory U-Boot then jumps to its link address.
3572To be able to implement the initialization code in C, a (small!)
3573initial stack is set up in the internal Dual Ported RAM (in case CPUs
3574which provide such a feature like MPC8xx or MPC8260), or in a locked
3575part of the data cache. After that, U-Boot initializes the CPU core,
3576the caches and the SIU.
wdenkc6097192002-11-03 00:24:07 +00003577
wdenk2729af92004-05-03 20:45:30 +00003578Next, all (potentially) available memory banks are mapped using a
3579preliminary mapping. For example, we put them on 512 MB boundaries
3580(multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash
3581on 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is
3582programmed for SDRAM access. Using the temporary configuration, a
3583simple memory test is run that determines the size of the SDRAM
3584banks.
wdenkc6097192002-11-03 00:24:07 +00003585
wdenk2729af92004-05-03 20:45:30 +00003586When there is more than one SDRAM bank, and the banks are of
3587different size, the largest is mapped first. For equal size, the first
3588bank (CS2#) is mapped first. The first mapping is always for address
35890x00000000, with any additional banks following immediately to create
3590contiguous memory starting from 0.
wdenkc6097192002-11-03 00:24:07 +00003591
wdenk2729af92004-05-03 20:45:30 +00003592Then, the monitor installs itself at the upper end of the SDRAM area
3593and allocates memory for use by malloc() and for the global Board
3594Info data; also, the exception vector code is copied to the low RAM
3595pages, and the final stack is set up.
wdenkc6097192002-11-03 00:24:07 +00003596
wdenk2729af92004-05-03 20:45:30 +00003597Only after this relocation will you have a "normal" C environment;
3598until that you are restricted in several ways, mostly because you are
3599running from ROM, and because the code will have to be relocated to a
3600new address in RAM.
wdenkc6097192002-11-03 00:24:07 +00003601
3602
wdenk2729af92004-05-03 20:45:30 +00003603U-Boot Porting Guide:
3604----------------------
wdenkc6097192002-11-03 00:24:07 +00003605
wdenk2729af92004-05-03 20:45:30 +00003606[Based on messages by Jerry Van Baren in the U-Boot-Users mailing
3607list, October 2002]
wdenkc6097192002-11-03 00:24:07 +00003608
3609
wdenk2729af92004-05-03 20:45:30 +00003610int main (int argc, char *argv[])
3611{
3612 sighandler_t no_more_time;
wdenkc6097192002-11-03 00:24:07 +00003613
wdenk2729af92004-05-03 20:45:30 +00003614 signal (SIGALRM, no_more_time);
3615 alarm (PROJECT_DEADLINE - toSec (3 * WEEK));
wdenkc6097192002-11-03 00:24:07 +00003616
wdenk2729af92004-05-03 20:45:30 +00003617 if (available_money > available_manpower) {
3618 pay consultant to port U-Boot;
wdenkc6097192002-11-03 00:24:07 +00003619 return 0;
3620 }
3621
wdenk2729af92004-05-03 20:45:30 +00003622 Download latest U-Boot source;
3623
3624 Subscribe to u-boot-users mailing list;
3625
3626 if (clueless) {
3627 email ("Hi, I am new to U-Boot, how do I get started?");
wdenkc6097192002-11-03 00:24:07 +00003628 }
3629
wdenk2729af92004-05-03 20:45:30 +00003630 while (learning) {
3631 Read the README file in the top level directory;
3632 Read http://www.denx.de/twiki/bin/view/DULG/Manual ;
3633 Read the source, Luke;
3634 }
wdenkc6097192002-11-03 00:24:07 +00003635
wdenk2729af92004-05-03 20:45:30 +00003636 if (available_money > toLocalCurrency ($2500)) {
3637 Buy a BDI2000;
3638 } else {
3639 Add a lot of aggravation and time;
3640 }
wdenkc6097192002-11-03 00:24:07 +00003641
wdenk2729af92004-05-03 20:45:30 +00003642 Create your own board support subdirectory;
wdenkc6097192002-11-03 00:24:07 +00003643
wdenk2729af92004-05-03 20:45:30 +00003644 Create your own board config file;
wdenk6aff3112002-12-17 01:51:00 +00003645
wdenk2729af92004-05-03 20:45:30 +00003646 while (!running) {
3647 do {
3648 Add / modify source code;
3649 } until (compiles);
3650 Debug;
3651 if (clueless)
3652 email ("Hi, I am having problems...");
3653 }
3654 Send patch file to Wolfgang;
wdenkc6097192002-11-03 00:24:07 +00003655
wdenk2729af92004-05-03 20:45:30 +00003656 return 0;
3657}
3658
3659void no_more_time (int sig)
3660{
3661 hire_a_guru();
3662}
wdenkc6097192002-11-03 00:24:07 +00003663
3664
wdenk2729af92004-05-03 20:45:30 +00003665Coding Standards:
3666-----------------
wdenkc6097192002-11-03 00:24:07 +00003667
wdenk2729af92004-05-03 20:45:30 +00003668All contributions to U-Boot should conform to the Linux kernel
Detlev Zundel2c051652006-09-01 15:39:02 +02003669coding style; see the file "Documentation/CodingStyle" and the script
3670"scripts/Lindent" in your Linux kernel source directory. In sources
3671originating from U-Boot a style corresponding to "Lindent -pcs" (adding
3672spaces before parameters to function calls) is actually used.
wdenk2729af92004-05-03 20:45:30 +00003673
Detlev Zundel2c051652006-09-01 15:39:02 +02003674Source files originating from a different project (for example the
3675MTD subsystem) are generally exempt from these guidelines and are not
3676reformated to ease subsequent migration to newer versions of those
3677sources.
3678
3679Please note that U-Boot is implemented in C (and to some small parts in
3680Assembler); no C++ is used, so please do not use C++ style comments (//)
3681in your code.
wdenk2729af92004-05-03 20:45:30 +00003682
3683Please also stick to the following formatting rules:
3684- remove any trailing white space
3685- use TAB characters for indentation, not spaces
3686- make sure NOT to use DOS '\r\n' line feeds
3687- do not add more than 2 empty lines to source files
3688- do not add trailing empty lines to source files
3689
3690Submissions which do not conform to the standards may be returned
3691with a request to reformat the changes.
wdenkc6097192002-11-03 00:24:07 +00003692
3693
wdenk2729af92004-05-03 20:45:30 +00003694Submitting Patches:
3695-------------------
wdenkc6097192002-11-03 00:24:07 +00003696
wdenk2729af92004-05-03 20:45:30 +00003697Since the number of patches for U-Boot is growing, we need to
3698establish some rules. Submissions which do not conform to these rules
3699may be rejected, even when they contain important and valuable stuff.
wdenkc6097192002-11-03 00:24:07 +00003700
wdenk90dc6702005-05-03 14:12:25 +00003701Patches shall be sent to the u-boot-users mailing list.
wdenkc6097192002-11-03 00:24:07 +00003702
wdenk2729af92004-05-03 20:45:30 +00003703When you send a patch, please include the following information with
3704it:
wdenkc6097192002-11-03 00:24:07 +00003705
wdenk2729af92004-05-03 20:45:30 +00003706* For bug fixes: a description of the bug and how your patch fixes
3707 this bug. Please try to include a way of demonstrating that the
3708 patch actually fixes something.
wdenkc6097192002-11-03 00:24:07 +00003709
wdenk2729af92004-05-03 20:45:30 +00003710* For new features: a description of the feature and your
3711 implementation.
wdenkc6097192002-11-03 00:24:07 +00003712
wdenk2729af92004-05-03 20:45:30 +00003713* A CHANGELOG entry as plaintext (separate from the patch)
3714
3715* For major contributions, your entry to the CREDITS file
3716
3717* When you add support for a new board, don't forget to add this
3718 board to the MAKEALL script, too.
3719
3720* If your patch adds new configuration options, don't forget to
3721 document these in the README file.
3722
3723* The patch itself. If you are accessing the CVS repository use "cvs
3724 update; cvs diff -puRN"; else, use "diff -purN OLD NEW". If your
3725 version of diff does not support these options, then get the latest
3726 version of GNU diff.
3727
3728 The current directory when running this command shall be the top
3729 level directory of the U-Boot source tree, or it's parent directory
3730 (i. e. please make sure that your patch includes sufficient
3731 directory information for the affected files).
3732
3733 We accept patches as plain text, MIME attachments or as uuencoded
3734 gzipped text.
3735
3736* If one logical set of modifications affects or creates several
3737 files, all these changes shall be submitted in a SINGLE patch file.
3738
3739* Changesets that contain different, unrelated modifications shall be
3740 submitted as SEPARATE patches, one patch per changeset.
3741
3742
3743Notes:
3744
3745* Before sending the patch, run the MAKEALL script on your patched
3746 source tree and make sure that no errors or warnings are reported
3747 for any of the boards.
3748
3749* Keep your modifications to the necessary minimum: A patch
3750 containing several unrelated changes or arbitrary reformats will be
3751 returned with a request to re-formatting / split it.
3752
3753* If you modify existing code, make sure that your new code does not
3754 add to the memory footprint of the code ;-) Small is beautiful!
3755 When adding new features, these should compile conditionally only
3756 (using #ifdef), and the resulting code with the new feature
3757 disabled must not need more memory than the old code without your
3758 modification.
wdenk90dc6702005-05-03 14:12:25 +00003759
3760* Remember that there is a size limit of 40 kB per message on the
3761 u-boot-users mailing list. Compression may help.