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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
TsiChungLiew1552af72008-01-14 17:43:33 -0600139 - mcf5227x Files specific to Freescale ColdFire MCF5227x CPUs
TsiChung Liew8e585f02007-06-18 13:50:13 -0500140 - mcf532x Files specific to Freescale ColdFire MCF5329 CPUs
TsiChungLiew8ae158c2007-08-16 15:05:11 -0500141 - mcf5445x Files specific to Freescale ColdFire MCF5445x CPUs
TsiChungLiew57a12722008-01-15 14:15:46 -0600142 - mcf547x_8x Files specific to Freescale ColdFire MCF547x_8x CPUs
wdenk11dadd52004-02-27 00:07:27 +0000143 - mips Files specific to MIPS CPUs
wdenk983fda82004-10-28 00:09:35 +0000144 - mpc5xx Files specific to Freescale MPC5xx CPUs
145 - mpc5xxx Files specific to Freescale MPC5xxx CPUs
146 - mpc8xx Files specific to Freescale MPC8xx CPUs
147 - mpc8220 Files specific to Freescale MPC8220 CPUs
148 - mpc824x Files specific to Freescale MPC824x CPUs
149 - mpc8260 Files specific to Freescale MPC8260 CPUs
150 - mpc85xx Files specific to Freescale MPC85xx CPUs
wdenk11dadd52004-02-27 00:07:27 +0000151 - nios Files specific to Altera NIOS CPUs
wdenk5c952cf2004-10-10 21:27:30 +0000152 - nios2 Files specific to Altera Nios-II CPUs
Wolfgang Denk0c8721a2005-09-23 11:05:55 +0200153 - ppc4xx Files specific to AMCC PowerPC 4xx CPUs
wdenk11dadd52004-02-27 00:07:27 +0000154 - pxa Files specific to Intel XScale PXA CPUs
155 - s3c44b0 Files specific to Samsung S3C44B0 CPUs
156 - sa1100 Files specific to Intel StrongARM SA1100 CPUs
wdenkc6097192002-11-03 00:24:07 +0000157- disk Code for disk drive partition handling
158- doc Documentation (don't expect too much)
wdenk7152b1d2003-09-05 23:19:14 +0000159- drivers Commonly used device drivers
wdenkc6097192002-11-03 00:24:07 +0000160- dtt Digital Thermometer and Thermostat drivers
161- examples Example code for standalone applications, etc.
162- include Header Files
wdenk11dadd52004-02-27 00:07:27 +0000163- lib_arm Files generic to ARM architecture
Wolfgang Denk7b64fef2006-10-24 14:21:16 +0200164- lib_avr32 Files generic to AVR32 architecture
wdenk11dadd52004-02-27 00:07:27 +0000165- lib_generic Files generic to all architectures
166- lib_i386 Files generic to i386 architecture
167- lib_m68k Files generic to m68k architecture
168- lib_mips Files generic to MIPS architecture
169- lib_nios Files generic to NIOS architecture
170- lib_ppc Files generic to PowerPC architecture
Gerald Van Baren213bf8c2007-03-31 12:23:51 -0400171- libfdt Library files to support flattened device trees
wdenkc6097192002-11-03 00:24:07 +0000172- net Networking code
wdenkc6097192002-11-03 00:24:07 +0000173- post Power On Self Test
wdenkc6097192002-11-03 00:24:07 +0000174- rtc Real Time Clock drivers
175- tools Tools to build S-Record or U-Boot images, etc.
176
wdenkc6097192002-11-03 00:24:07 +0000177Software Configuration:
178=======================
179
180Configuration is usually done using C preprocessor defines; the
181rationale behind that is to avoid dead code whenever possible.
182
183There are two classes of configuration variables:
184
185* Configuration _OPTIONS_:
186 These are selectable by the user and have names beginning with
187 "CONFIG_".
188
189* Configuration _SETTINGS_:
190 These depend on the hardware etc. and should not be meddled with if
191 you don't know what you're doing; they have names beginning with
192 "CFG_".
193
194Later we will add a configuration tool - probably similar to or even
195identical to what's used for the Linux kernel. Right now, we have to
196do the configuration by hand, which means creating some symbolic
197links and editing some configuration files. We use the TQM8xxL boards
198as an example here.
199
200
201Selection of Processor Architecture and Board Type:
202---------------------------------------------------
203
204For all supported boards there are ready-to-use default
205configurations available; just type "make <board_name>_config".
206
207Example: For a TQM823L module type:
208
209 cd u-boot
210 make TQM823L_config
211
212For the Cogent platform, you need to specify the cpu type as well;
213e.g. "make cogent_mpc8xx_config". And also configure the cogent
214directory according to the instructions in cogent/README.
215
216
217Configuration Options:
218----------------------
219
220Configuration depends on the combination of board and CPU type; all
221such information is kept in a configuration file
222"include/configs/<board_name>.h".
223
224Example: For a TQM823L module, all configuration settings are in
225"include/configs/TQM823L.h".
226
227
wdenk7f6c2cb2002-11-10 22:06:23 +0000228Many of the options are named exactly as the corresponding Linux
229kernel configuration options. The intention is to make it easier to
230build a config tool - later.
231
232
wdenkc6097192002-11-03 00:24:07 +0000233The following options need to be configured:
234
Kim Phillips26281142007-08-10 13:28:25 -0500235- CPU Type: Define exactly one, e.g. CONFIG_MPC85XX.
wdenkc6097192002-11-03 00:24:07 +0000236
Kim Phillips26281142007-08-10 13:28:25 -0500237- Board Type: Define exactly one, e.g. CONFIG_MPC8540ADS.
Wolfgang Denk6ccec442006-10-24 14:42:37 +0200238
239- CPU Daughterboard Type: (if CONFIG_ATSTK1000 is defined)
Haavard Skinnemoen09ea0de2007-11-01 12:44:20 +0100240 Define exactly one, e.g. CONFIG_ATSTK1002
wdenkc6097192002-11-03 00:24:07 +0000241
242- CPU Module Type: (if CONFIG_COGENT is defined)
243 Define exactly one of
244 CONFIG_CMA286_60_OLD
245--- FIXME --- not tested yet:
246 CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P,
247 CONFIG_CMA287_23, CONFIG_CMA287_50
248
249- Motherboard Type: (if CONFIG_COGENT is defined)
250 Define exactly one of
251 CONFIG_CMA101, CONFIG_CMA102
252
253- Motherboard I/O Modules: (if CONFIG_COGENT is defined)
254 Define one or more of
255 CONFIG_CMA302
256
257- Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined)
258 Define one or more of
259 CONFIG_LCD_HEARTBEAT - update a character position on
260 the lcd display every second with
261 a "rotator" |\-/|\-/
262
wdenk2535d602003-07-17 23:16:40 +0000263- Board flavour: (if CONFIG_MPC8260ADS is defined)
264 CONFIG_ADSTYPE
265 Possible values are:
266 CFG_8260ADS - original MPC8260ADS
wdenk180d3f72004-01-04 16:28:35 +0000267 CFG_8266ADS - MPC8266ADS
wdenk54387ac2003-10-08 22:45:44 +0000268 CFG_PQ2FADS - PQ2FADS-ZU or PQ2FADS-VR
wdenk04a85b32004-04-15 18:22:41 +0000269 CFG_8272ADS - MPC8272ADS
wdenk2535d602003-07-17 23:16:40 +0000270
wdenkc6097192002-11-03 00:24:07 +0000271- MPC824X Family Member (if CONFIG_MPC824X is defined)
wdenk5da627a2003-10-09 20:09:04 +0000272 Define exactly one of
273 CONFIG_MPC8240, CONFIG_MPC8245
wdenkc6097192002-11-03 00:24:07 +0000274
wdenk75d1ea72004-01-31 20:06:54 +0000275- 8xx CPU Options: (if using an MPC8xx cpu)
wdenk66ca92a2004-09-28 17:59:53 +0000276 CONFIG_8xx_GCLK_FREQ - deprecated: CPU clock if
277 get_gclk_freq() cannot work
wdenk5da627a2003-10-09 20:09:04 +0000278 e.g. if there is no 32KHz
279 reference PIT/RTC clock
wdenk66ca92a2004-09-28 17:59:53 +0000280 CONFIG_8xx_OSCLK - PLL input clock (either EXTCLK
281 or XTAL/EXTAL)
wdenkc6097192002-11-03 00:24:07 +0000282
wdenk66ca92a2004-09-28 17:59:53 +0000283- 859/866/885 CPU options: (if using a MPC859 or MPC866 or MPC885 CPU):
284 CFG_8xx_CPUCLK_MIN
285 CFG_8xx_CPUCLK_MAX
286 CONFIG_8xx_CPUCLK_DEFAULT
wdenk75d1ea72004-01-31 20:06:54 +0000287 See doc/README.MPC866
288
289 CFG_MEASURE_CPUCLK
290
wdenkba56f622004-02-06 23:19:44 +0000291 Define this to measure the actual CPU clock instead
292 of relying on the correctness of the configured
293 values. Mostly useful for board bringup to make sure
294 the PLL is locked at the intended frequency. Note
295 that this requires a (stable) reference clock (32 kHz
wdenk66ca92a2004-09-28 17:59:53 +0000296 RTC clock or CFG_8XX_XIN)
wdenk75d1ea72004-01-31 20:06:54 +0000297
Markus Klotzbuecher0b953ff2006-03-24 15:28:02 +0100298- Intel Monahans options:
299 CFG_MONAHANS_RUN_MODE_OSC_RATIO
300
301 Defines the Monahans run mode to oscillator
302 ratio. Valid values are 8, 16, 24, 31. The core
303 frequency is this value multiplied by 13 MHz.
304
305 CFG_MONAHANS_TURBO_RUN_MODE_RATIO
Wolfgang Denkcf48eb92006-04-16 10:51:58 +0200306
Markus Klotzbuecher0b953ff2006-03-24 15:28:02 +0100307 Defines the Monahans turbo mode to oscillator
308 ratio. Valid values are 1 (default if undefined) and
Wolfgang Denkcf48eb92006-04-16 10:51:58 +0200309 2. The core frequency as calculated above is multiplied
Markus Klotzbuecher0b953ff2006-03-24 15:28:02 +0100310 by this value.
Wolfgang Denkcf48eb92006-04-16 10:51:58 +0200311
wdenk5da627a2003-10-09 20:09:04 +0000312- Linux Kernel Interface:
wdenkc6097192002-11-03 00:24:07 +0000313 CONFIG_CLOCKS_IN_MHZ
314
315 U-Boot stores all clock information in Hz
316 internally. For binary compatibility with older Linux
317 kernels (which expect the clocks passed in the
318 bd_info data to be in MHz) the environment variable
319 "clocks_in_mhz" can be defined so that U-Boot
320 converts clock data to MHZ before passing it to the
321 Linux kernel.
wdenkc6097192002-11-03 00:24:07 +0000322 When CONFIG_CLOCKS_IN_MHZ is defined, a definition of
323 "clocks_in_mhz=1" is automatically included in the
324 default environment.
325
wdenk5da627a2003-10-09 20:09:04 +0000326 CONFIG_MEMSIZE_IN_BYTES [relevant for MIPS only]
327
328 When transfering memsize parameter to linux, some versions
329 expect it to be in bytes, others in MB.
330 Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes.
331
Gerald Van Baren213bf8c2007-03-31 12:23:51 -0400332 CONFIG_OF_LIBFDT / CONFIG_OF_FLAT_TREE
Wolfgang Denkf57f70a2005-10-13 01:45:54 +0200333
334 New kernel versions are expecting firmware settings to be
Gerald Van Baren213bf8c2007-03-31 12:23:51 -0400335 passed using flattened device trees (based on open firmware
336 concepts).
337
338 CONFIG_OF_LIBFDT
339 * New libfdt-based support
340 * Adds the "fdt" command
Kim Phillips3bb342f2007-08-10 14:34:14 -0500341 * The bootm command automatically updates the fdt
Gerald Van Baren213bf8c2007-03-31 12:23:51 -0400342
343 CONFIG_OF_FLAT_TREE
344 * Deprecated, see CONFIG_OF_LIBFDT
345 * Original ft_build.c-based support
346 * Automatically modifies the dft as part of the bootm command
347 * The environment variable "disable_of", when set,
348 disables this functionality.
Wolfgang Denkf57f70a2005-10-13 01:45:54 +0200349
Wolfgang Denkf57f70a2005-10-13 01:45:54 +0200350 OF_CPU - The proper name of the cpus node.
Kumar Galac2871f02006-01-11 13:59:02 -0600351 OF_SOC - The proper name of the soc node.
Wolfgang Denkf57f70a2005-10-13 01:45:54 +0200352 OF_TBCLK - The timebase frequency.
Kumar Galac2871f02006-01-11 13:59:02 -0600353 OF_STDOUT_PATH - The path to the console device
Wolfgang Denkf57f70a2005-10-13 01:45:54 +0200354
Kim Phillips3bb342f2007-08-10 14:34:14 -0500355 boards with QUICC Engines require OF_QE to set UCC mac addresses
356
Kumar Galae4f880e2006-01-11 13:49:31 -0600357 CONFIG_OF_HAS_BD_T
358
Gerald Van Baren213bf8c2007-03-31 12:23:51 -0400359 * CONFIG_OF_LIBFDT - enables the "fdt bd_t" command
360 * CONFIG_OF_FLAT_TREE - The resulting flat device tree
361 will have a copy of the bd_t. Space should be
362 pre-allocated in the dts for the bd_t.
Kumar Galae4f880e2006-01-11 13:49:31 -0600363
364 CONFIG_OF_HAS_UBOOT_ENV
Stefan Roese15940c92006-03-13 11:16:36 +0100365
Kim Phillips3bb342f2007-08-10 14:34:14 -0500366 * CONFIG_OF_LIBFDT - enables the "fdt env" command
Gerald Van Baren213bf8c2007-03-31 12:23:51 -0400367 * CONFIG_OF_FLAT_TREE - The resulting flat device tree
368 will have a copy of u-boot's environment variables
Kumar Galae4f880e2006-01-11 13:49:31 -0600369
Kumar Gala4e253132006-01-11 13:54:17 -0600370 CONFIG_OF_BOARD_SETUP
371
372 Board code has addition modification that it wants to make
373 to the flat device tree before handing it off to the kernel
wdenk6705d812004-08-02 23:22:59 +0000374
Matthew McClintock02677682006-06-28 10:41:37 -0500375 CONFIG_OF_BOOT_CPU
376
377 This define fills in the correct boot cpu in the boot
378 param header, the default value is zero if undefined.
379
wdenk6705d812004-08-02 23:22:59 +0000380- Serial Ports:
381 CFG_PL010_SERIAL
382
383 Define this if you want support for Amba PrimeCell PL010 UARTs.
384
385 CFG_PL011_SERIAL
386
387 Define this if you want support for Amba PrimeCell PL011 UARTs.
388
389 CONFIG_PL011_CLOCK
390
391 If you have Amba PrimeCell PL011 UARTs, set this variable to
392 the clock speed of the UARTs.
393
394 CONFIG_PL01x_PORTS
395
396 If you have Amba PrimeCell PL010 or PL011 UARTs on your board,
397 define this to a list of base addresses for each (supported)
398 port. See e.g. include/configs/versatile.h
399
400
wdenkc6097192002-11-03 00:24:07 +0000401- Console Interface:
wdenk43d96162003-03-06 00:02:04 +0000402 Depending on board, define exactly one serial port
403 (like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2,
404 CONFIG_8xx_CONS_SCC1, ...), or switch off the serial
405 console by defining CONFIG_8xx_CONS_NONE
wdenkc6097192002-11-03 00:24:07 +0000406
407 Note: if CONFIG_8xx_CONS_NONE is defined, the serial
408 port routines must be defined elsewhere
409 (i.e. serial_init(), serial_getc(), ...)
410
411 CONFIG_CFB_CONSOLE
412 Enables console device for a color framebuffer. Needs following
413 defines (cf. smiLynxEM, i8042, board/eltec/bab7xx)
414 VIDEO_FB_LITTLE_ENDIAN graphic memory organisation
415 (default big endian)
416 VIDEO_HW_RECTFILL graphic chip supports
417 rectangle fill
418 (cf. smiLynxEM)
419 VIDEO_HW_BITBLT graphic chip supports
420 bit-blit (cf. smiLynxEM)
421 VIDEO_VISIBLE_COLS visible pixel columns
422 (cols=pitch)
wdenkba56f622004-02-06 23:19:44 +0000423 VIDEO_VISIBLE_ROWS visible pixel rows
424 VIDEO_PIXEL_SIZE bytes per pixel
wdenkc6097192002-11-03 00:24:07 +0000425 VIDEO_DATA_FORMAT graphic data format
426 (0-5, cf. cfb_console.c)
wdenkba56f622004-02-06 23:19:44 +0000427 VIDEO_FB_ADRS framebuffer address
wdenkc6097192002-11-03 00:24:07 +0000428 VIDEO_KBD_INIT_FCT keyboard int fct
429 (i.e. i8042_kbd_init())
430 VIDEO_TSTC_FCT test char fct
431 (i.e. i8042_tstc)
432 VIDEO_GETC_FCT get char fct
433 (i.e. i8042_getc)
434 CONFIG_CONSOLE_CURSOR cursor drawing on/off
435 (requires blink timer
436 cf. i8042.c)
437 CFG_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c)
438 CONFIG_CONSOLE_TIME display time/date info in
439 upper right corner
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500440 (requires CONFIG_CMD_DATE)
wdenkc6097192002-11-03 00:24:07 +0000441 CONFIG_VIDEO_LOGO display Linux logo in
442 upper left corner
wdenka6c7ad22002-12-03 21:28:10 +0000443 CONFIG_VIDEO_BMP_LOGO use bmp_logo.h instead of
444 linux_logo.h for logo.
445 Requires CONFIG_VIDEO_LOGO
wdenkc6097192002-11-03 00:24:07 +0000446 CONFIG_CONSOLE_EXTRA_INFO
447 addional board info beside
448 the logo
449
wdenk43d96162003-03-06 00:02:04 +0000450 When CONFIG_CFB_CONSOLE is defined, video console is
451 default i/o. Serial console can be forced with
452 environment 'console=serial'.
wdenkc6097192002-11-03 00:24:07 +0000453
wdenkd4ca31c2004-01-02 14:00:00 +0000454 When CONFIG_SILENT_CONSOLE is defined, all console
455 messages (by U-Boot and Linux!) can be silenced with
456 the "silent" environment variable. See
457 doc/README.silent for more information.
wdenka3ad8e22003-10-19 23:22:11 +0000458
wdenkc6097192002-11-03 00:24:07 +0000459- Console Baudrate:
460 CONFIG_BAUDRATE - in bps
461 Select one of the baudrates listed in
462 CFG_BAUDRATE_TABLE, see below.
wdenk3bbc8992003-12-07 22:27:15 +0000463 CFG_BRGCLK_PRESCALE, baudrate prescale
wdenkc6097192002-11-03 00:24:07 +0000464
465- Interrupt driven serial port input:
466 CONFIG_SERIAL_SOFTWARE_FIFO
467
468 PPC405GP only.
469 Use an interrupt handler for receiving data on the
470 serial port. It also enables using hardware handshake
471 (RTS/CTS) and UART's built-in FIFO. Set the number of
472 bytes the interrupt driven input buffer should have.
473
wdenk109c0e32004-03-23 21:43:07 +0000474 Leave undefined to disable this feature, including
475 disable the buffer and hardware handshake.
wdenkc6097192002-11-03 00:24:07 +0000476
stroese1d49b1f2003-05-23 11:39:05 +0000477- Console UART Number:
478 CONFIG_UART1_CONSOLE
479
Wolfgang Denk0c8721a2005-09-23 11:05:55 +0200480 AMCC PPC4xx only.
stroese1d49b1f2003-05-23 11:39:05 +0000481 If defined internal UART1 (and not UART0) is used
482 as default U-Boot console.
483
wdenkc6097192002-11-03 00:24:07 +0000484- Boot Delay: CONFIG_BOOTDELAY - in seconds
485 Delay before automatically booting the default image;
486 set to -1 to disable autoboot.
487
488 See doc/README.autoboot for these options that
489 work with CONFIG_BOOTDELAY. None are required.
490 CONFIG_BOOT_RETRY_TIME
491 CONFIG_BOOT_RETRY_MIN
492 CONFIG_AUTOBOOT_KEYED
493 CONFIG_AUTOBOOT_PROMPT
494 CONFIG_AUTOBOOT_DELAY_STR
495 CONFIG_AUTOBOOT_STOP_STR
496 CONFIG_AUTOBOOT_DELAY_STR2
497 CONFIG_AUTOBOOT_STOP_STR2
498 CONFIG_ZERO_BOOTDELAY_CHECK
499 CONFIG_RESET_TO_RETRY
500
501- Autoboot Command:
502 CONFIG_BOOTCOMMAND
503 Only needed when CONFIG_BOOTDELAY is enabled;
504 define a command string that is automatically executed
505 when no character is read on the console interface
506 within "Boot Delay" after reset.
507
508 CONFIG_BOOTARGS
wdenk43d96162003-03-06 00:02:04 +0000509 This can be used to pass arguments to the bootm
510 command. The value of CONFIG_BOOTARGS goes into the
511 environment value "bootargs".
wdenkc6097192002-11-03 00:24:07 +0000512
513 CONFIG_RAMBOOT and CONFIG_NFSBOOT
wdenk43d96162003-03-06 00:02:04 +0000514 The value of these goes into the environment as
515 "ramboot" and "nfsboot" respectively, and can be used
516 as a convenience, when switching between booting from
517 ram and nfs.
wdenkc6097192002-11-03 00:24:07 +0000518
519- Pre-Boot Commands:
520 CONFIG_PREBOOT
521
522 When this option is #defined, the existence of the
523 environment variable "preboot" will be checked
524 immediately before starting the CONFIG_BOOTDELAY
525 countdown and/or running the auto-boot command resp.
526 entering interactive mode.
527
528 This feature is especially useful when "preboot" is
529 automatically generated or modified. For an example
530 see the LWMON board specific code: here "preboot" is
531 modified when the user holds down a certain
532 combination of keys on the (special) keyboard when
533 booting the systems
534
535- Serial Download Echo Mode:
536 CONFIG_LOADS_ECHO
537 If defined to 1, all characters received during a
538 serial download (using the "loads" command) are
539 echoed back. This might be needed by some terminal
540 emulations (like "cu"), but may as well just take
541 time on others. This setting #define's the initial
542 value of the "loads_echo" environment variable.
543
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500544- Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined)
wdenkc6097192002-11-03 00:24:07 +0000545 CONFIG_KGDB_BAUDRATE
546 Select one of the baudrates listed in
547 CFG_BAUDRATE_TABLE, see below.
548
549- Monitor Functions:
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500550 Monitor commands can be included or excluded
551 from the build by using the #include files
552 "config_cmd_all.h" and #undef'ing unwanted
553 commands, or using "config_cmd_default.h"
554 and augmenting with additional #define's
555 for wanted commands.
wdenkc6097192002-11-03 00:24:07 +0000556
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500557 The default command configuration includes all commands
558 except those marked below with a "*".
wdenkc6097192002-11-03 00:24:07 +0000559
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500560 CONFIG_CMD_ASKENV * ask for env variable
561 CONFIG_CMD_AUTOSCRIPT Autoscript Support
562 CONFIG_CMD_BDI bdinfo
563 CONFIG_CMD_BEDBUG * Include BedBug Debugger
564 CONFIG_CMD_BMP * BMP support
565 CONFIG_CMD_BSP * Board specific commands
566 CONFIG_CMD_BOOTD bootd
567 CONFIG_CMD_CACHE * icache, dcache
568 CONFIG_CMD_CONSOLE coninfo
569 CONFIG_CMD_DATE * support for RTC, date/time...
570 CONFIG_CMD_DHCP * DHCP support
571 CONFIG_CMD_DIAG * Diagnostics
572 CONFIG_CMD_DOC * Disk-On-Chip Support
573 CONFIG_CMD_DTT * Digital Therm and Thermostat
574 CONFIG_CMD_ECHO echo arguments
575 CONFIG_CMD_EEPROM * EEPROM read/write support
576 CONFIG_CMD_ELF * bootelf, bootvx
577 CONFIG_CMD_ENV saveenv
578 CONFIG_CMD_FDC * Floppy Disk Support
579 CONFIG_CMD_FAT * FAT partition support
580 CONFIG_CMD_FDOS * Dos diskette Support
581 CONFIG_CMD_FLASH flinfo, erase, protect
582 CONFIG_CMD_FPGA FPGA device initialization support
583 CONFIG_CMD_HWFLOW * RTS/CTS hw flow control
584 CONFIG_CMD_I2C * I2C serial bus support
585 CONFIG_CMD_IDE * IDE harddisk support
586 CONFIG_CMD_IMI iminfo
587 CONFIG_CMD_IMLS List all found images
588 CONFIG_CMD_IMMAP * IMMR dump support
589 CONFIG_CMD_IRQ * irqinfo
590 CONFIG_CMD_ITEST Integer/string test of 2 values
591 CONFIG_CMD_JFFS2 * JFFS2 Support
592 CONFIG_CMD_KGDB * kgdb
593 CONFIG_CMD_LOADB loadb
594 CONFIG_CMD_LOADS loads
595 CONFIG_CMD_MEMORY md, mm, nm, mw, cp, cmp, crc, base,
596 loop, loopw, mtest
597 CONFIG_CMD_MISC Misc functions like sleep etc
598 CONFIG_CMD_MMC * MMC memory mapped support
599 CONFIG_CMD_MII * MII utility commands
600 CONFIG_CMD_NAND * NAND support
601 CONFIG_CMD_NET bootp, tftpboot, rarpboot
602 CONFIG_CMD_PCI * pciinfo
603 CONFIG_CMD_PCMCIA * PCMCIA support
604 CONFIG_CMD_PING * send ICMP ECHO_REQUEST to network
605 host
606 CONFIG_CMD_PORTIO * Port I/O
607 CONFIG_CMD_REGINFO * Register dump
608 CONFIG_CMD_RUN run command in env variable
609 CONFIG_CMD_SAVES * save S record dump
610 CONFIG_CMD_SCSI * SCSI Support
611 CONFIG_CMD_SDRAM * print SDRAM configuration information
612 (requires CONFIG_CMD_I2C)
613 CONFIG_CMD_SETGETDCR Support for DCR Register access
614 (4xx only)
615 CONFIG_CMD_SPI * SPI serial bus support
616 CONFIG_CMD_USB * USB support
617 CONFIG_CMD_VFD * VFD support (TRAB)
618 CONFIG_CMD_BSP * Board SPecific functions
619 CONFIG_CMD_CDP * Cisco Discover Protocol support
620 CONFIG_CMD_FSL * Microblaze FSL support
wdenkc6097192002-11-03 00:24:07 +0000621
wdenkc6097192002-11-03 00:24:07 +0000622
623 EXAMPLE: If you want all functions except of network
624 support you can write:
625
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500626 #include "config_cmd_all.h"
627 #undef CONFIG_CMD_NET
wdenkc6097192002-11-03 00:24:07 +0000628
Gerald Van Baren213bf8c2007-03-31 12:23:51 -0400629 Other Commands:
630 fdt (flattened device tree) command: CONFIG_OF_LIBFDT
wdenkc6097192002-11-03 00:24:07 +0000631
632 Note: Don't enable the "icache" and "dcache" commands
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500633 (configuration option CONFIG_CMD_CACHE) unless you know
wdenk43d96162003-03-06 00:02:04 +0000634 what you (and your U-Boot users) are doing. Data
635 cache cannot be enabled on systems like the 8xx or
636 8260 (where accesses to the IMMR region must be
637 uncached), and it cannot be disabled on all other
638 systems where we (mis-) use the data cache to hold an
639 initial stack and some data.
wdenkc6097192002-11-03 00:24:07 +0000640
641
642 XXX - this list needs to get updated!
643
644- Watchdog:
645 CONFIG_WATCHDOG
646 If this variable is defined, it enables watchdog
wdenk7152b1d2003-09-05 23:19:14 +0000647 support. There must be support in the platform specific
wdenkc6097192002-11-03 00:24:07 +0000648 code for a watchdog. For the 8xx and 8260 CPUs, the
649 SIU Watchdog feature is enabled in the SYPCR
650 register.
651
stroesec1551ea2003-04-04 15:53:41 +0000652- U-Boot Version:
653 CONFIG_VERSION_VARIABLE
654 If this variable is defined, an environment variable
655 named "ver" is created by U-Boot showing the U-Boot
656 version as printed by the "version" command.
657 This variable is readonly.
658
wdenkc6097192002-11-03 00:24:07 +0000659- Real-Time Clock:
660
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500661 When CONFIG_CMD_DATE is selected, the type of the RTC
wdenkc6097192002-11-03 00:24:07 +0000662 has to be selected, too. Define exactly one of the
663 following options:
664
665 CONFIG_RTC_MPC8xx - use internal RTC of MPC8xx
666 CONFIG_RTC_PCF8563 - use Philips PCF8563 RTC
667 CONFIG_RTC_MC146818 - use MC146818 RTC
wdenk1cb8e982003-03-06 21:55:29 +0000668 CONFIG_RTC_DS1307 - use Maxim, Inc. DS1307 RTC
wdenkc6097192002-11-03 00:24:07 +0000669 CONFIG_RTC_DS1337 - use Maxim, Inc. DS1337 RTC
wdenk7f70e852003-05-20 14:25:27 +0000670 CONFIG_RTC_DS1338 - use Maxim, Inc. DS1338 RTC
wdenk3bac3512003-03-12 10:41:04 +0000671 CONFIG_RTC_DS164x - use Dallas DS164x RTC
wdenk4c0d4c32004-06-09 17:34:58 +0000672 CONFIG_RTC_MAX6900 - use Maxim, Inc. MAX6900 RTC
wdenkc6097192002-11-03 00:24:07 +0000673
wdenkb37c7e52003-06-30 16:24:52 +0000674 Note that if the RTC uses I2C, then the I2C interface
675 must also be configured. See I2C Support, below.
676
wdenkc6097192002-11-03 00:24:07 +0000677- Timestamp Support:
678
wdenk43d96162003-03-06 00:02:04 +0000679 When CONFIG_TIMESTAMP is selected, the timestamp
680 (date and time) of an image is printed by image
681 commands like bootm or iminfo. This option is
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500682 automatically enabled when you select CONFIG_CMD_DATE .
wdenkc6097192002-11-03 00:24:07 +0000683
684- Partition Support:
685 CONFIG_MAC_PARTITION and/or CONFIG_DOS_PARTITION
686 and/or CONFIG_ISO_PARTITION
687
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500688 If IDE or SCSI support is enabled (CONFIG_CMD_IDE or
689 CONFIG_CMD_SCSI) you must configure support for at least
wdenkc6097192002-11-03 00:24:07 +0000690 one partition type as well.
691
692- IDE Reset method:
wdenk4d13cba2004-03-14 14:09:05 +0000693 CONFIG_IDE_RESET_ROUTINE - this is defined in several
694 board configurations files but used nowhere!
wdenkc6097192002-11-03 00:24:07 +0000695
wdenk4d13cba2004-03-14 14:09:05 +0000696 CONFIG_IDE_RESET - is this is defined, IDE Reset will
697 be performed by calling the function
698 ide_set_reset(int reset)
699 which has to be defined in a board specific file
wdenkc6097192002-11-03 00:24:07 +0000700
701- ATAPI Support:
702 CONFIG_ATAPI
703
704 Set this to enable ATAPI support.
705
wdenkc40b2952004-03-13 23:29:43 +0000706- LBA48 Support
707 CONFIG_LBA48
708
709 Set this to enable support for disks larger than 137GB
710 Also look at CFG_64BIT_LBA ,CFG_64BIT_VSPRINTF and CFG_64BIT_STRTOUL
711 Whithout these , LBA48 support uses 32bit variables and will 'only'
712 support disks up to 2.1TB.
713
714 CFG_64BIT_LBA:
715 When enabled, makes the IDE subsystem use 64bit sector addresses.
716 Default is 32bit.
717
wdenkc6097192002-11-03 00:24:07 +0000718- SCSI Support:
719 At the moment only there is only support for the
720 SYM53C8XX SCSI controller; define
721 CONFIG_SCSI_SYM53C8XX to enable it.
722
723 CFG_SCSI_MAX_LUN [8], CFG_SCSI_MAX_SCSI_ID [7] and
724 CFG_SCSI_MAX_DEVICE [CFG_SCSI_MAX_SCSI_ID *
725 CFG_SCSI_MAX_LUN] can be adjusted to define the
726 maximum numbers of LUNs, SCSI ID's and target
727 devices.
728 CFG_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz)
729
730- NETWORK Support (PCI):
wdenk682011f2003-06-03 23:54:09 +0000731 CONFIG_E1000
732 Support for Intel 8254x gigabit chips.
stroese53cf9432003-06-05 15:39:44 +0000733
wdenkc6097192002-11-03 00:24:07 +0000734 CONFIG_EEPRO100
735 Support for Intel 82557/82559/82559ER chips.
736 Optional CONFIG_EEPRO100_SROM_WRITE enables eeprom
737 write routine for first time initialisation.
738
739 CONFIG_TULIP
740 Support for Digital 2114x chips.
741 Optional CONFIG_TULIP_SELECT_MEDIA for board specific
742 modem chip initialisation (KS8761/QS6611).
743
744 CONFIG_NATSEMI
745 Support for National dp83815 chips.
746
747 CONFIG_NS8382X
748 Support for National dp8382[01] gigabit chips.
749
wdenk45219c42003-05-12 21:50:16 +0000750- NETWORK Support (other):
751
752 CONFIG_DRIVER_LAN91C96
753 Support for SMSC's LAN91C96 chips.
754
755 CONFIG_LAN91C96_BASE
756 Define this to hold the physical address
757 of the LAN91C96's I/O space
758
759 CONFIG_LAN91C96_USE_32_BIT
760 Define this to enable 32 bit addressing
761
wdenkf39748a2004-06-09 13:37:52 +0000762 CONFIG_DRIVER_SMC91111
763 Support for SMSC's LAN91C111 chip
764
765 CONFIG_SMC91111_BASE
766 Define this to hold the physical address
767 of the device (I/O space)
768
769 CONFIG_SMC_USE_32_BIT
770 Define this if data bus is 32 bits
771
772 CONFIG_SMC_USE_IOFUNCS
773 Define this to use i/o functions instead of macros
774 (some hardware wont work with macros)
775
wdenkc6097192002-11-03 00:24:07 +0000776- USB Support:
777 At the moment only the UHCI host controller is
wdenk4d13cba2004-03-14 14:09:05 +0000778 supported (PIP405, MIP405, MPC5200); define
wdenkc6097192002-11-03 00:24:07 +0000779 CONFIG_USB_UHCI to enable it.
780 define CONFIG_USB_KEYBOARD to enable the USB Keyboard
wdenk30d56fa2004-10-09 22:44:59 +0000781 and define CONFIG_USB_STORAGE to enable the USB
wdenkc6097192002-11-03 00:24:07 +0000782 storage devices.
783 Note:
784 Supported are USB Keyboards and USB Floppy drives
785 (TEAC FD-05PUB).
wdenk4d13cba2004-03-14 14:09:05 +0000786 MPC5200 USB requires additional defines:
787 CONFIG_USB_CLOCK
788 for 528 MHz Clock: 0x0001bbbb
789 CONFIG_USB_CONFIG
790 for differential drivers: 0x00001000
791 for single ended drivers: 0x00005000
Zhang Weifdcfaa12007-06-06 10:08:13 +0200792 CFG_USB_EVENT_POLL
793 May be defined to allow interrupt polling
794 instead of using asynchronous interrupts
wdenk4d13cba2004-03-14 14:09:05 +0000795
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200796- USB Device:
797 Define the below if you wish to use the USB console.
798 Once firmware is rebuilt from a serial console issue the
799 command "setenv stdin usbtty; setenv stdout usbtty" and
800 attach your usb cable. The Unix command "dmesg" should print
801 it has found a new device. The environment variable usbtty
802 can be set to gserial or cdc_acm to enable your device to
Wolfgang Denk386eda02006-06-14 18:14:56 +0200803 appear to a USB host as a Linux gserial device or a
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200804 Common Device Class Abstract Control Model serial device.
805 If you select usbtty = gserial you should be able to enumerate
806 a Linux host by
807 # modprobe usbserial vendor=0xVendorID product=0xProductID
808 else if using cdc_acm, simply setting the environment
809 variable usbtty to be cdc_acm should suffice. The following
810 might be defined in YourBoardName.h
Wolfgang Denk386eda02006-06-14 18:14:56 +0200811
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200812 CONFIG_USB_DEVICE
813 Define this to build a UDC device
wdenkc6097192002-11-03 00:24:07 +0000814
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200815 CONFIG_USB_TTY
816 Define this to have a tty type of device available to
817 talk to the UDC device
Wolfgang Denk386eda02006-06-14 18:14:56 +0200818
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200819 CFG_CONSOLE_IS_IN_ENV
820 Define this if you want stdin, stdout &/or stderr to
821 be set to usbtty.
822
823 mpc8xx:
824 CFG_USB_EXTC_CLK 0xBLAH
825 Derive USB clock from external clock "blah"
Wolfgang Denk386eda02006-06-14 18:14:56 +0200826 - CFG_USB_EXTC_CLK 0x02
827
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200828 CFG_USB_BRG_CLK 0xBLAH
829 Derive USB clock from brgclk
830 - CFG_USB_BRG_CLK 0x04
831
Wolfgang Denk386eda02006-06-14 18:14:56 +0200832 If you have a USB-IF assigned VendorID then you may wish to
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200833 define your own vendor specific values either in BoardName.h
Wolfgang Denk386eda02006-06-14 18:14:56 +0200834 or directly in usbd_vendor_info.h. If you don't define
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200835 CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME,
836 CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot
837 should pretend to be a Linux device to it's target host.
838
839 CONFIG_USBD_MANUFACTURER
840 Define this string as the name of your company for
841 - CONFIG_USBD_MANUFACTURER "my company"
Wolfgang Denk386eda02006-06-14 18:14:56 +0200842
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200843 CONFIG_USBD_PRODUCT_NAME
844 Define this string as the name of your product
845 - CONFIG_USBD_PRODUCT_NAME "acme usb device"
846
847 CONFIG_USBD_VENDORID
848 Define this as your assigned Vendor ID from the USB
849 Implementors Forum. This *must* be a genuine Vendor ID
850 to avoid polluting the USB namespace.
851 - CONFIG_USBD_VENDORID 0xFFFF
Wolfgang Denk386eda02006-06-14 18:14:56 +0200852
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200853 CONFIG_USBD_PRODUCTID
854 Define this as the unique Product ID
855 for your device
856 - CONFIG_USBD_PRODUCTID 0xFFFF
wdenkc6097192002-11-03 00:24:07 +0000857
858
859- MMC Support:
860 The MMC controller on the Intel PXA is supported. To
861 enable this define CONFIG_MMC. The MMC can be
862 accessed from the boot prompt by mapping the device
863 to physical memory similar to flash. Command line is
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500864 enabled with CONFIG_CMD_MMC. The MMC driver also works with
865 the FAT fs. This is enabled with CONFIG_CMD_FAT.
wdenkc6097192002-11-03 00:24:07 +0000866
wdenk6705d812004-08-02 23:22:59 +0000867- Journaling Flash filesystem support:
868 CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE,
869 CONFIG_JFFS2_NAND_DEV
870 Define these for a default partition on a NAND device
871
872 CFG_JFFS2_FIRST_SECTOR,
873 CFG_JFFS2_FIRST_BANK, CFG_JFFS2_NUM_BANKS
874 Define these for a default partition on a NOR device
875
876 CFG_JFFS_CUSTOM_PART
877 Define this to create an own partition. You have to provide a
878 function struct part_info* jffs2_part_info(int part_num)
879
880 If you define only one JFFS2 partition you may also want to
wdenkefe2a4d2004-12-16 21:44:03 +0000881 #define CFG_JFFS_SINGLE_PART 1
wdenk6705d812004-08-02 23:22:59 +0000882 to disable the command chpart. This is the default when you
883 have not defined a custom partition
884
wdenkc6097192002-11-03 00:24:07 +0000885- Keyboard Support:
886 CONFIG_ISA_KEYBOARD
887
888 Define this to enable standard (PC-Style) keyboard
889 support
890
891 CONFIG_I8042_KBD
892 Standard PC keyboard driver with US (is default) and
893 GERMAN key layout (switch via environment 'keymap=de') support.
894 Export function i8042_kbd_init, i8042_tstc and i8042_getc
895 for cfb_console. Supports cursor blinking.
896
897- Video support:
898 CONFIG_VIDEO
899
900 Define this to enable video support (for output to
901 video).
902
903 CONFIG_VIDEO_CT69000
904
905 Enable Chips & Technologies 69000 Video chip
906
907 CONFIG_VIDEO_SMI_LYNXEM
wdenkb79a11c2004-03-25 15:14:43 +0000908 Enable Silicon Motion SMI 712/710/810 Video chip. The
wdenkeeb1b772004-03-23 22:53:55 +0000909 video output is selected via environment 'videoout'
910 (1 = LCD and 2 = CRT). If videoout is undefined, CRT is
911 assumed.
wdenkc6097192002-11-03 00:24:07 +0000912
wdenkb79a11c2004-03-25 15:14:43 +0000913 For the CT69000 and SMI_LYNXEM drivers, videomode is
914 selected via environment 'videomode'. Two diferent ways
wdenkeeb1b772004-03-23 22:53:55 +0000915 are possible:
916 - "videomode=num" 'num' is a standard LiLo mode numbers.
wdenk6e592382004-04-18 17:39:38 +0000917 Following standard modes are supported (* is default):
wdenkeeb1b772004-03-23 22:53:55 +0000918
919 Colors 640x480 800x600 1024x768 1152x864 1280x1024
920 -------------+---------------------------------------------
921 8 bits | 0x301* 0x303 0x305 0x161 0x307
922 15 bits | 0x310 0x313 0x316 0x162 0x319
923 16 bits | 0x311 0x314 0x317 0x163 0x31A
924 24 bits | 0x312 0x315 0x318 ? 0x31B
925 -------------+---------------------------------------------
wdenkc6097192002-11-03 00:24:07 +0000926 (i.e. setenv videomode 317; saveenv; reset;)
927
wdenkb79a11c2004-03-25 15:14:43 +0000928 - "videomode=bootargs" all the video parameters are parsed
Marcel Ziswiler7817cb22007-12-30 03:30:46 +0100929 from the bootargs. (See drivers/video/videomodes.c)
wdenkeeb1b772004-03-23 22:53:55 +0000930
931
stroesec1551ea2003-04-04 15:53:41 +0000932 CONFIG_VIDEO_SED13806
wdenk43d96162003-03-06 00:02:04 +0000933 Enable Epson SED13806 driver. This driver supports 8bpp
wdenka6c7ad22002-12-03 21:28:10 +0000934 and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP
935 or CONFIG_VIDEO_SED13806_16BPP
936
wdenk682011f2003-06-03 23:54:09 +0000937- Keyboard Support:
wdenk8bde7f72003-06-27 21:31:46 +0000938 CONFIG_KEYBOARD
wdenk682011f2003-06-03 23:54:09 +0000939
wdenk8bde7f72003-06-27 21:31:46 +0000940 Define this to enable a custom keyboard support.
941 This simply calls drv_keyboard_init() which must be
942 defined in your board-specific files.
943 The only board using this so far is RBC823.
wdenka6c7ad22002-12-03 21:28:10 +0000944
wdenkc6097192002-11-03 00:24:07 +0000945- LCD Support: CONFIG_LCD
946
947 Define this to enable LCD support (for output to LCD
948 display); also select one of the supported displays
949 by defining one of these:
950
wdenkfd3103b2003-11-25 16:55:19 +0000951 CONFIG_NEC_NL6448AC33:
wdenkc6097192002-11-03 00:24:07 +0000952
wdenkfd3103b2003-11-25 16:55:19 +0000953 NEC NL6448AC33-18. Active, color, single scan.
wdenkc6097192002-11-03 00:24:07 +0000954
wdenkfd3103b2003-11-25 16:55:19 +0000955 CONFIG_NEC_NL6448BC20
wdenkc6097192002-11-03 00:24:07 +0000956
wdenkfd3103b2003-11-25 16:55:19 +0000957 NEC NL6448BC20-08. 6.5", 640x480.
958 Active, color, single scan.
959
960 CONFIG_NEC_NL6448BC33_54
961
962 NEC NL6448BC33-54. 10.4", 640x480.
wdenkc6097192002-11-03 00:24:07 +0000963 Active, color, single scan.
964
965 CONFIG_SHARP_16x9
966
967 Sharp 320x240. Active, color, single scan.
968 It isn't 16x9, and I am not sure what it is.
969
970 CONFIG_SHARP_LQ64D341
971
972 Sharp LQ64D341 display, 640x480.
973 Active, color, single scan.
974
975 CONFIG_HLD1045
976
977 HLD1045 display, 640x480.
978 Active, color, single scan.
979
980 CONFIG_OPTREX_BW
981
982 Optrex CBL50840-2 NF-FW 99 22 M5
983 or
984 Hitachi LMG6912RPFC-00T
985 or
986 Hitachi SP14Q002
987
988 320x240. Black & white.
989
990 Normally display is black on white background; define
991 CFG_WHITE_ON_BLACK to get it inverted.
992
wdenk7152b1d2003-09-05 23:19:14 +0000993- Splash Screen Support: CONFIG_SPLASH_SCREEN
wdenkd791b1d2003-04-20 14:04:18 +0000994
wdenk8bde7f72003-06-27 21:31:46 +0000995 If this option is set, the environment is checked for
996 a variable "splashimage". If found, the usual display
997 of logo, copyright and system information on the LCD
wdenke94d2cd2004-06-30 22:59:18 +0000998 is suppressed and the BMP image at the address
wdenk8bde7f72003-06-27 21:31:46 +0000999 specified in "splashimage" is loaded instead. The
1000 console is redirected to the "nulldev", too. This
1001 allows for a "silent" boot where a splash screen is
1002 loaded very quickly after power-on.
wdenkd791b1d2003-04-20 14:04:18 +00001003
Stefan Roese98f4a3d2005-09-22 09:04:17 +02001004- Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP
1005
1006 If this option is set, additionally to standard BMP
1007 images, gzipped BMP images can be displayed via the
1008 splashscreen support or the bmp command.
1009
wdenkc29fdfc2003-08-29 20:57:53 +00001010- Compression support:
1011 CONFIG_BZIP2
1012
1013 If this option is set, support for bzip2 compressed
1014 images is included. If not, only uncompressed and gzip
1015 compressed images are supported.
1016
wdenk42d1f032003-10-15 23:53:47 +00001017 NOTE: the bzip2 algorithm requires a lot of RAM, so
1018 the malloc area (as defined by CFG_MALLOC_LEN) should
1019 be at least 4MB.
wdenkd791b1d2003-04-20 14:04:18 +00001020
wdenk17ea1172004-06-06 21:51:03 +00001021- MII/PHY support:
1022 CONFIG_PHY_ADDR
1023
1024 The address of PHY on MII bus.
1025
1026 CONFIG_PHY_CLOCK_FREQ (ppc4xx)
1027
1028 The clock frequency of the MII bus
1029
1030 CONFIG_PHY_GIGE
1031
1032 If this option is set, support for speed/duplex
1033 detection of Gigabit PHY is included.
1034
1035 CONFIG_PHY_RESET_DELAY
1036
1037 Some PHY like Intel LXT971A need extra delay after
1038 reset before any MII register access is possible.
1039 For such PHY, set this option to the usec delay
1040 required. (minimum 300usec for LXT971A)
1041
1042 CONFIG_PHY_CMD_DELAY (ppc4xx)
1043
1044 Some PHY like Intel LXT971A need extra delay after
1045 command issued before MII status register can be read
1046
wdenkc6097192002-11-03 00:24:07 +00001047- Ethernet address:
1048 CONFIG_ETHADDR
1049 CONFIG_ETH2ADDR
1050 CONFIG_ETH3ADDR
1051
1052 Define a default value for ethernet address to use
1053 for the respective ethernet interface, in case this
1054 is not determined automatically.
1055
1056- IP address:
1057 CONFIG_IPADDR
1058
1059 Define a default value for the IP address to use for
1060 the default ethernet interface, in case this is not
1061 determined through e.g. bootp.
1062
1063- Server IP address:
1064 CONFIG_SERVERIP
1065
1066 Defines a default value for theIP address of a TFTP
1067 server to contact when using the "tftboot" command.
1068
David Updegraff53a5c422007-06-11 10:41:07 -05001069- Multicast TFTP Mode:
1070 CONFIG_MCAST_TFTP
1071
1072 Defines whether you want to support multicast TFTP as per
1073 rfc-2090; for example to work with atftp. Lets lots of targets
1074 tftp down the same boot image concurrently. Note: the ethernet
1075 driver in use must provide a function: mcast() to join/leave a
1076 multicast group.
1077
1078 CONFIG_BOOTP_RANDOM_DELAY
wdenkc6097192002-11-03 00:24:07 +00001079- BOOTP Recovery Mode:
1080 CONFIG_BOOTP_RANDOM_DELAY
1081
1082 If you have many targets in a network that try to
1083 boot using BOOTP, you may want to avoid that all
1084 systems send out BOOTP requests at precisely the same
1085 moment (which would happen for instance at recovery
1086 from a power failure, when all systems will try to
1087 boot, thus flooding the BOOTP server. Defining
1088 CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be
1089 inserted before sending out BOOTP requests. The
Wolfgang Denk6c33c782007-08-06 23:21:05 +02001090 following delays are inserted then:
wdenkc6097192002-11-03 00:24:07 +00001091
1092 1st BOOTP request: delay 0 ... 1 sec
1093 2nd BOOTP request: delay 0 ... 2 sec
1094 3rd BOOTP request: delay 0 ... 4 sec
1095 4th and following
1096 BOOTP requests: delay 0 ... 8 sec
1097
stroesefe389a82003-08-28 14:17:32 +00001098- DHCP Advanced Options:
Jon Loeliger1fe80d72007-07-09 22:08:34 -05001099 You can fine tune the DHCP functionality by defining
1100 CONFIG_BOOTP_* symbols:
stroesefe389a82003-08-28 14:17:32 +00001101
Jon Loeliger1fe80d72007-07-09 22:08:34 -05001102 CONFIG_BOOTP_SUBNETMASK
1103 CONFIG_BOOTP_GATEWAY
1104 CONFIG_BOOTP_HOSTNAME
1105 CONFIG_BOOTP_NISDOMAIN
1106 CONFIG_BOOTP_BOOTPATH
1107 CONFIG_BOOTP_BOOTFILESIZE
1108 CONFIG_BOOTP_DNS
1109 CONFIG_BOOTP_DNS2
1110 CONFIG_BOOTP_SEND_HOSTNAME
1111 CONFIG_BOOTP_NTPSERVER
1112 CONFIG_BOOTP_TIMEOFFSET
1113 CONFIG_BOOTP_VENDOREX
stroesefe389a82003-08-28 14:17:32 +00001114
Wilson Callan5d110f02007-07-28 10:56:13 -04001115 CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip
1116 environment variable, not the BOOTP server.
stroesefe389a82003-08-28 14:17:32 +00001117
1118 CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS
1119 serverip from a DHCP server, it is possible that more
1120 than one DNS serverip is offered to the client.
1121 If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS
1122 serverip will be stored in the additional environment
1123 variable "dnsip2". The first DNS serverip is always
1124 stored in the variable "dnsip", when CONFIG_BOOTP_DNS
Jon Loeliger1fe80d72007-07-09 22:08:34 -05001125 is defined.
stroesefe389a82003-08-28 14:17:32 +00001126
1127 CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable
1128 to do a dynamic update of a DNS server. To do this, they
1129 need the hostname of the DHCP requester.
Wilson Callan5d110f02007-07-28 10:56:13 -04001130 If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content
Jon Loeliger1fe80d72007-07-09 22:08:34 -05001131 of the "hostname" environment variable is passed as
1132 option 12 to the DHCP server.
stroesefe389a82003-08-28 14:17:32 +00001133
wdenka3d991b2004-04-15 21:48:45 +00001134 - CDP Options:
wdenk6e592382004-04-18 17:39:38 +00001135 CONFIG_CDP_DEVICE_ID
wdenka3d991b2004-04-15 21:48:45 +00001136
1137 The device id used in CDP trigger frames.
1138
1139 CONFIG_CDP_DEVICE_ID_PREFIX
1140
1141 A two character string which is prefixed to the MAC address
1142 of the device.
1143
1144 CONFIG_CDP_PORT_ID
1145
1146 A printf format string which contains the ascii name of
1147 the port. Normally is set to "eth%d" which sets
1148 eth0 for the first ethernet, eth1 for the second etc.
1149
1150 CONFIG_CDP_CAPABILITIES
1151
1152 A 32bit integer which indicates the device capabilities;
1153 0x00000010 for a normal host which does not forwards.
1154
1155 CONFIG_CDP_VERSION
1156
1157 An ascii string containing the version of the software.
1158
1159 CONFIG_CDP_PLATFORM
1160
1161 An ascii string containing the name of the platform.
1162
1163 CONFIG_CDP_TRIGGER
1164
1165 A 32bit integer sent on the trigger.
1166
1167 CONFIG_CDP_POWER_CONSUMPTION
1168
1169 A 16bit integer containing the power consumption of the
1170 device in .1 of milliwatts.
1171
1172 CONFIG_CDP_APPLIANCE_VLAN_TYPE
1173
1174 A byte containing the id of the VLAN.
1175
wdenkc6097192002-11-03 00:24:07 +00001176- Status LED: CONFIG_STATUS_LED
1177
1178 Several configurations allow to display the current
1179 status using a LED. For instance, the LED will blink
1180 fast while running U-Boot code, stop blinking as
1181 soon as a reply to a BOOTP request was received, and
1182 start blinking slow once the Linux kernel is running
1183 (supported by a status LED driver in the Linux
1184 kernel). Defining CONFIG_STATUS_LED enables this
1185 feature in U-Boot.
1186
1187- CAN Support: CONFIG_CAN_DRIVER
1188
1189 Defining CONFIG_CAN_DRIVER enables CAN driver support
1190 on those systems that support this (optional)
1191 feature, like the TQM8xxL modules.
1192
1193- I2C Support: CONFIG_HARD_I2C | CONFIG_SOFT_I2C
1194
wdenkb37c7e52003-06-30 16:24:52 +00001195 These enable I2C serial bus commands. Defining either of
wdenk945af8d2003-07-16 21:53:01 +00001196 (but not both of) CONFIG_HARD_I2C or CONFIG_SOFT_I2C will
1197 include the appropriate I2C driver for the selected cpu.
wdenkc6097192002-11-03 00:24:07 +00001198
wdenk945af8d2003-07-16 21:53:01 +00001199 This will allow you to use i2c commands at the u-boot
Jon Loeliger602ad3b2007-06-11 19:03:39 -05001200 command line (as long as you set CONFIG_CMD_I2C in
wdenkb37c7e52003-06-30 16:24:52 +00001201 CONFIG_COMMANDS) and communicate with i2c based realtime
1202 clock chips. See common/cmd_i2c.c for a description of the
wdenk43d96162003-03-06 00:02:04 +00001203 command line interface.
wdenkc6097192002-11-03 00:24:07 +00001204
Ben Warrenbb99ad62006-09-07 16:50:54 -04001205 CONFIG_I2C_CMD_TREE is a recommended option that places
1206 all I2C commands under a single 'i2c' root command. The
1207 older 'imm', 'imd', 'iprobe' etc. commands are considered
1208 deprecated and may disappear in the future.
1209
1210 CONFIG_HARD_I2C selects a hardware I2C controller.
wdenkc6097192002-11-03 00:24:07 +00001211
wdenk945af8d2003-07-16 21:53:01 +00001212 CONFIG_SOFT_I2C configures u-boot to use a software (aka
wdenkb37c7e52003-06-30 16:24:52 +00001213 bit-banging) driver instead of CPM or similar hardware
1214 support for I2C.
wdenkc6097192002-11-03 00:24:07 +00001215
wdenk945af8d2003-07-16 21:53:01 +00001216 There are several other quantities that must also be
wdenkb37c7e52003-06-30 16:24:52 +00001217 defined when you define CONFIG_HARD_I2C or CONFIG_SOFT_I2C.
wdenkc6097192002-11-03 00:24:07 +00001218
wdenkb37c7e52003-06-30 16:24:52 +00001219 In both cases you will need to define CFG_I2C_SPEED
wdenk945af8d2003-07-16 21:53:01 +00001220 to be the frequency (in Hz) at which you wish your i2c bus
1221 to run and CFG_I2C_SLAVE to be the address of this node (ie
1222 the cpu's i2c node address).
1223
wdenkb37c7e52003-06-30 16:24:52 +00001224 Now, the u-boot i2c code for the mpc8xx (cpu/mpc8xx/i2c.c)
1225 sets the cpu up as a master node and so its address should
1226 therefore be cleared to 0 (See, eg, MPC823e User's Manual
wdenk945af8d2003-07-16 21:53:01 +00001227 p.16-473). So, set CFG_I2C_SLAVE to 0.
wdenkc6097192002-11-03 00:24:07 +00001228
wdenk945af8d2003-07-16 21:53:01 +00001229 That's all that's required for CONFIG_HARD_I2C.
wdenkb37c7e52003-06-30 16:24:52 +00001230
1231 If you use the software i2c interface (CONFIG_SOFT_I2C)
1232 then the following macros need to be defined (examples are
1233 from include/configs/lwmon.h):
wdenkc6097192002-11-03 00:24:07 +00001234
1235 I2C_INIT
1236
wdenkb37c7e52003-06-30 16:24:52 +00001237 (Optional). Any commands necessary to enable the I2C
wdenk43d96162003-03-06 00:02:04 +00001238 controller or configure ports.
wdenkc6097192002-11-03 00:24:07 +00001239
wdenkba56f622004-02-06 23:19:44 +00001240 eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |= PB_SCL)
wdenkb37c7e52003-06-30 16:24:52 +00001241
wdenkc6097192002-11-03 00:24:07 +00001242 I2C_PORT
1243
wdenk43d96162003-03-06 00:02:04 +00001244 (Only for MPC8260 CPU). The I/O port to use (the code
1245 assumes both bits are on the same port). Valid values
1246 are 0..3 for ports A..D.
wdenkc6097192002-11-03 00:24:07 +00001247
1248 I2C_ACTIVE
1249
1250 The code necessary to make the I2C data line active
1251 (driven). If the data line is open collector, this
1252 define can be null.
1253
wdenkb37c7e52003-06-30 16:24:52 +00001254 eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |= PB_SDA)
1255
wdenkc6097192002-11-03 00:24:07 +00001256 I2C_TRISTATE
1257
1258 The code necessary to make the I2C data line tri-stated
1259 (inactive). If the data line is open collector, this
1260 define can be null.
1261
wdenkb37c7e52003-06-30 16:24:52 +00001262 eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA)
1263
wdenkc6097192002-11-03 00:24:07 +00001264 I2C_READ
1265
1266 Code that returns TRUE if the I2C data line is high,
1267 FALSE if it is low.
1268
wdenkb37c7e52003-06-30 16:24:52 +00001269 eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0)
1270
wdenkc6097192002-11-03 00:24:07 +00001271 I2C_SDA(bit)
1272
1273 If <bit> is TRUE, sets the I2C data line high. If it
1274 is FALSE, it clears it (low).
1275
wdenkb37c7e52003-06-30 16:24:52 +00001276 eg: #define I2C_SDA(bit) \
wdenk2535d602003-07-17 23:16:40 +00001277 if(bit) immr->im_cpm.cp_pbdat |= PB_SDA; \
wdenkba56f622004-02-06 23:19:44 +00001278 else immr->im_cpm.cp_pbdat &= ~PB_SDA
wdenkb37c7e52003-06-30 16:24:52 +00001279
wdenkc6097192002-11-03 00:24:07 +00001280 I2C_SCL(bit)
1281
1282 If <bit> is TRUE, sets the I2C clock line high. If it
1283 is FALSE, it clears it (low).
1284
wdenkb37c7e52003-06-30 16:24:52 +00001285 eg: #define I2C_SCL(bit) \
wdenk2535d602003-07-17 23:16:40 +00001286 if(bit) immr->im_cpm.cp_pbdat |= PB_SCL; \
wdenkba56f622004-02-06 23:19:44 +00001287 else immr->im_cpm.cp_pbdat &= ~PB_SCL
wdenkb37c7e52003-06-30 16:24:52 +00001288
wdenkc6097192002-11-03 00:24:07 +00001289 I2C_DELAY
1290
1291 This delay is invoked four times per clock cycle so this
1292 controls the rate of data transfer. The data rate thus
wdenkb37c7e52003-06-30 16:24:52 +00001293 is 1 / (I2C_DELAY * 4). Often defined to be something
wdenk945af8d2003-07-16 21:53:01 +00001294 like:
1295
wdenkb37c7e52003-06-30 16:24:52 +00001296 #define I2C_DELAY udelay(2)
wdenkc6097192002-11-03 00:24:07 +00001297
wdenk47cd00f2003-03-06 13:39:27 +00001298 CFG_I2C_INIT_BOARD
1299
wdenk8bde7f72003-06-27 21:31:46 +00001300 When a board is reset during an i2c bus transfer
1301 chips might think that the current transfer is still
1302 in progress. On some boards it is possible to access
1303 the i2c SCLK line directly, either by using the
1304 processor pin as a GPIO or by having a second pin
1305 connected to the bus. If this option is defined a
1306 custom i2c_init_board() routine in boards/xxx/board.c
1307 is run early in the boot sequence.
wdenk47cd00f2003-03-06 13:39:27 +00001308
wdenk17ea1172004-06-06 21:51:03 +00001309 CONFIG_I2CFAST (PPC405GP|PPC405EP only)
1310
1311 This option enables configuration of bi_iic_fast[] flags
1312 in u-boot bd_info structure based on u-boot environment
1313 variable "i2cfast". (see also i2cfast)
1314
Ben Warrenbb99ad62006-09-07 16:50:54 -04001315 CONFIG_I2C_MULTI_BUS
1316
1317 This option allows the use of multiple I2C buses, each of which
1318 must have a controller. At any point in time, only one bus is
1319 active. To switch to a different bus, use the 'i2c dev' command.
1320 Note that bus numbering is zero-based.
1321
1322 CFG_I2C_NOPROBES
1323
1324 This option specifies a list of I2C devices that will be skipped
1325 when the 'i2c probe' command is issued (or 'iprobe' using the legacy
1326 command). If CONFIG_I2C_MULTI_BUS is set, specify a list of bus-device
1327 pairs. Otherwise, specify a 1D array of device addresses
1328
1329 e.g.
1330 #undef CONFIG_I2C_MULTI_BUS
1331 #define CFG_I2C_NOPROBES {0x50,0x68}
1332
1333 will skip addresses 0x50 and 0x68 on a board with one I2C bus
1334
1335 #define CONFIG_I2C_MULTI_BUS
1336 #define CFG_I2C_MULTI_NOPROBES {{0,0x50},{0,0x68},{1,0x54}}
1337
1338 will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1
1339
Timur Tabibe5e6182006-11-03 19:15:00 -06001340 CFG_SPD_BUS_NUM
1341
1342 If defined, then this indicates the I2C bus number for DDR SPD.
1343 If not defined, then U-Boot assumes that SPD is on I2C bus 0.
1344
Stefan Roese0dc018e2007-02-20 10:51:26 +01001345 CFG_RTC_BUS_NUM
1346
1347 If defined, then this indicates the I2C bus number for the RTC.
1348 If not defined, then U-Boot assumes that RTC is on I2C bus 0.
1349
1350 CFG_DTT_BUS_NUM
1351
1352 If defined, then this indicates the I2C bus number for the DTT.
1353 If not defined, then U-Boot assumes that DTT is on I2C bus 0.
1354
Timur Tabibe5e6182006-11-03 19:15:00 -06001355 CONFIG_FSL_I2C
1356
1357 Define this option if you want to use Freescale's I2C driver in
Marcel Ziswiler7817cb22007-12-30 03:30:46 +01001358 drivers/i2c/fsl_i2c.c.
Timur Tabibe5e6182006-11-03 19:15:00 -06001359
1360
wdenkc6097192002-11-03 00:24:07 +00001361- SPI Support: CONFIG_SPI
1362
1363 Enables SPI driver (so far only tested with
1364 SPI EEPROM, also an instance works with Crystal A/D and
1365 D/As on the SACSng board)
1366
1367 CONFIG_SPI_X
1368
1369 Enables extended (16-bit) SPI EEPROM addressing.
1370 (symmetrical to CONFIG_I2C_X)
1371
1372 CONFIG_SOFT_SPI
1373
wdenk43d96162003-03-06 00:02:04 +00001374 Enables a software (bit-bang) SPI driver rather than
1375 using hardware support. This is a general purpose
1376 driver that only requires three general I/O port pins
1377 (two outputs, one input) to function. If this is
1378 defined, the board configuration must define several
1379 SPI configuration items (port pins to use, etc). For
1380 an example, see include/configs/sacsng.h.
wdenkc6097192002-11-03 00:24:07 +00001381
Ben Warren04a9e112008-01-16 22:37:35 -05001382 CONFIG_HARD_SPI
1383
1384 Enables a hardware SPI driver for general-purpose reads
1385 and writes. As with CONFIG_SOFT_SPI, the board configuration
1386 must define a list of chip-select function pointers.
1387 Currently supported on some MPC8xxx processors. For an
1388 example, see include/configs/mpc8349emds.h.
1389
Matthias Fuchs01335022007-12-27 17:12:34 +01001390- FPGA Support: CONFIG_FPGA
1391
1392 Enables FPGA subsystem.
1393
1394 CONFIG_FPGA_<vendor>
1395
1396 Enables support for specific chip vendors.
1397 (ALTERA, XILINX)
1398
1399 CONFIG_FPGA_<family>
1400
1401 Enables support for FPGA family.
1402 (SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX)
1403
1404 CONFIG_FPGA_COUNT
wdenkc6097192002-11-03 00:24:07 +00001405
wdenk43d96162003-03-06 00:02:04 +00001406 Specify the number of FPGA devices to support.
wdenkc6097192002-11-03 00:24:07 +00001407
wdenk8bde7f72003-06-27 21:31:46 +00001408 CFG_FPGA_PROG_FEEDBACK
wdenkc6097192002-11-03 00:24:07 +00001409
wdenk8bde7f72003-06-27 21:31:46 +00001410 Enable printing of hash marks during FPGA configuration.
wdenkc6097192002-11-03 00:24:07 +00001411
1412 CFG_FPGA_CHECK_BUSY
1413
wdenk43d96162003-03-06 00:02:04 +00001414 Enable checks on FPGA configuration interface busy
1415 status by the configuration function. This option
1416 will require a board or device specific function to
1417 be written.
wdenkc6097192002-11-03 00:24:07 +00001418
1419 CONFIG_FPGA_DELAY
1420
1421 If defined, a function that provides delays in the FPGA
1422 configuration driver.
1423
1424 CFG_FPGA_CHECK_CTRLC
1425 Allow Control-C to interrupt FPGA configuration
1426
1427 CFG_FPGA_CHECK_ERROR
1428
wdenk43d96162003-03-06 00:02:04 +00001429 Check for configuration errors during FPGA bitfile
1430 loading. For example, abort during Virtex II
1431 configuration if the INIT_B line goes low (which
1432 indicated a CRC error).
wdenkc6097192002-11-03 00:24:07 +00001433
1434 CFG_FPGA_WAIT_INIT
1435
wdenk43d96162003-03-06 00:02:04 +00001436 Maximum time to wait for the INIT_B line to deassert
1437 after PROB_B has been deasserted during a Virtex II
1438 FPGA configuration sequence. The default time is 500
1439 mS.
wdenkc6097192002-11-03 00:24:07 +00001440
1441 CFG_FPGA_WAIT_BUSY
1442
wdenk43d96162003-03-06 00:02:04 +00001443 Maximum time to wait for BUSY to deassert during
1444 Virtex II FPGA configuration. The default is 5 mS.
wdenkc6097192002-11-03 00:24:07 +00001445
1446 CFG_FPGA_WAIT_CONFIG
1447
wdenk43d96162003-03-06 00:02:04 +00001448 Time to wait after FPGA configuration. The default is
1449 200 mS.
wdenkc6097192002-11-03 00:24:07 +00001450
1451- Configuration Management:
1452 CONFIG_IDENT_STRING
1453
wdenk43d96162003-03-06 00:02:04 +00001454 If defined, this string will be added to the U-Boot
1455 version information (U_BOOT_VERSION)
wdenkc6097192002-11-03 00:24:07 +00001456
1457- Vendor Parameter Protection:
1458
wdenk43d96162003-03-06 00:02:04 +00001459 U-Boot considers the values of the environment
1460 variables "serial#" (Board Serial Number) and
wdenk7152b1d2003-09-05 23:19:14 +00001461 "ethaddr" (Ethernet Address) to be parameters that
wdenk43d96162003-03-06 00:02:04 +00001462 are set once by the board vendor / manufacturer, and
1463 protects these variables from casual modification by
1464 the user. Once set, these variables are read-only,
1465 and write or delete attempts are rejected. You can
1466 change this behviour:
wdenkc6097192002-11-03 00:24:07 +00001467
1468 If CONFIG_ENV_OVERWRITE is #defined in your config
1469 file, the write protection for vendor parameters is
wdenk47cd00f2003-03-06 13:39:27 +00001470 completely disabled. Anybody can change or delete
wdenkc6097192002-11-03 00:24:07 +00001471 these parameters.
1472
1473 Alternatively, if you #define _both_ CONFIG_ETHADDR
1474 _and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default
1475 ethernet address is installed in the environment,
1476 which can be changed exactly ONCE by the user. [The
1477 serial# is unaffected by this, i. e. it remains
1478 read-only.]
1479
1480- Protected RAM:
1481 CONFIG_PRAM
1482
1483 Define this variable to enable the reservation of
1484 "protected RAM", i. e. RAM which is not overwritten
1485 by U-Boot. Define CONFIG_PRAM to hold the number of
1486 kB you want to reserve for pRAM. You can overwrite
1487 this default value by defining an environment
1488 variable "pram" to the number of kB you want to
1489 reserve. Note that the board info structure will
1490 still show the full amount of RAM. If pRAM is
1491 reserved, a new environment variable "mem" will
1492 automatically be defined to hold the amount of
1493 remaining RAM in a form that can be passed as boot
1494 argument to Linux, for instance like that:
1495
Wolfgang Denkfe126d82005-11-20 21:40:11 +01001496 setenv bootargs ... mem=\${mem}
wdenkc6097192002-11-03 00:24:07 +00001497 saveenv
1498
1499 This way you can tell Linux not to use this memory,
1500 either, which results in a memory region that will
1501 not be affected by reboots.
1502
1503 *WARNING* If your board configuration uses automatic
1504 detection of the RAM size, you must make sure that
1505 this memory test is non-destructive. So far, the
1506 following board configurations are known to be
1507 "pRAM-clean":
1508
1509 ETX094, IVMS8, IVML24, SPD8xx, TQM8xxL,
1510 HERMES, IP860, RPXlite, LWMON, LANTEC,
1511 PCU_E, FLAGADM, TQM8260
1512
1513- Error Recovery:
1514 CONFIG_PANIC_HANG
1515
1516 Define this variable to stop the system in case of a
1517 fatal error, so that you have to reset it manually.
1518 This is probably NOT a good idea for an embedded
1519 system where you want to system to reboot
1520 automatically as fast as possible, but it may be
1521 useful during development since you can try to debug
1522 the conditions that lead to the situation.
1523
1524 CONFIG_NET_RETRY_COUNT
1525
wdenk43d96162003-03-06 00:02:04 +00001526 This variable defines the number of retries for
1527 network operations like ARP, RARP, TFTP, or BOOTP
1528 before giving up the operation. If not defined, a
1529 default value of 5 is used.
wdenkc6097192002-11-03 00:24:07 +00001530
1531- Command Interpreter:
Wolfgang Denk8078f1a2006-10-28 02:28:02 +02001532 CONFIG_AUTO_COMPLETE
wdenk04a85b32004-04-15 18:22:41 +00001533
1534 Enable auto completion of commands using TAB.
1535
Wolfgang Denka9398e02006-11-27 15:32:42 +01001536 Note that this feature has NOT been implemented yet
1537 for the "hush" shell.
Wolfgang Denk8078f1a2006-10-28 02:28:02 +02001538
1539
wdenkc6097192002-11-03 00:24:07 +00001540 CFG_HUSH_PARSER
1541
1542 Define this variable to enable the "hush" shell (from
1543 Busybox) as command line interpreter, thus enabling
1544 powerful command line syntax like
1545 if...then...else...fi conditionals or `&&' and '||'
1546 constructs ("shell scripts").
1547
1548 If undefined, you get the old, much simpler behaviour
1549 with a somewhat smaller memory footprint.
1550
1551
1552 CFG_PROMPT_HUSH_PS2
1553
1554 This defines the secondary prompt string, which is
1555 printed when the command interpreter needs more input
1556 to complete a command. Usually "> ".
1557
1558 Note:
1559
wdenk8bde7f72003-06-27 21:31:46 +00001560 In the current implementation, the local variables
1561 space and global environment variables space are
1562 separated. Local variables are those you define by
1563 simply typing `name=value'. To access a local
1564 variable later on, you have write `$name' or
1565 `${name}'; to execute the contents of a variable
1566 directly type `$name' at the command prompt.
wdenkc6097192002-11-03 00:24:07 +00001567
wdenk43d96162003-03-06 00:02:04 +00001568 Global environment variables are those you use
1569 setenv/printenv to work with. To run a command stored
1570 in such a variable, you need to use the run command,
1571 and you must not use the '$' sign to access them.
wdenkc6097192002-11-03 00:24:07 +00001572
1573 To store commands and special characters in a
1574 variable, please use double quotation marks
1575 surrounding the whole text of the variable, instead
1576 of the backslashes before semicolons and special
1577 symbols.
1578
Wolfgang Denkaa0c71a2006-07-21 11:35:21 +02001579- Commandline Editing and History:
1580 CONFIG_CMDLINE_EDITING
1581
Wolfgang Denkb9365a22006-07-21 11:56:05 +02001582 Enable editiong and History functions for interactive
1583 commandline input operations
Wolfgang Denkaa0c71a2006-07-21 11:35:21 +02001584
wdenka8c7c702003-12-06 19:49:23 +00001585- Default Environment:
wdenkc6097192002-11-03 00:24:07 +00001586 CONFIG_EXTRA_ENV_SETTINGS
1587
wdenk43d96162003-03-06 00:02:04 +00001588 Define this to contain any number of null terminated
1589 strings (variable = value pairs) that will be part of
wdenk7152b1d2003-09-05 23:19:14 +00001590 the default environment compiled into the boot image.
wdenk2262cfe2002-11-18 00:14:45 +00001591
wdenk43d96162003-03-06 00:02:04 +00001592 For example, place something like this in your
1593 board's config file:
wdenkc6097192002-11-03 00:24:07 +00001594
1595 #define CONFIG_EXTRA_ENV_SETTINGS \
1596 "myvar1=value1\0" \
1597 "myvar2=value2\0"
1598
wdenk43d96162003-03-06 00:02:04 +00001599 Warning: This method is based on knowledge about the
1600 internal format how the environment is stored by the
1601 U-Boot code. This is NOT an official, exported
1602 interface! Although it is unlikely that this format
wdenk7152b1d2003-09-05 23:19:14 +00001603 will change soon, there is no guarantee either.
wdenkc6097192002-11-03 00:24:07 +00001604 You better know what you are doing here.
1605
wdenk43d96162003-03-06 00:02:04 +00001606 Note: overly (ab)use of the default environment is
1607 discouraged. Make sure to check other ways to preset
1608 the environment like the autoscript function or the
1609 boot command first.
wdenkc6097192002-11-03 00:24:07 +00001610
wdenka8c7c702003-12-06 19:49:23 +00001611- DataFlash Support:
wdenk2abbe072003-06-16 23:50:08 +00001612 CONFIG_HAS_DATAFLASH
1613
wdenk8bde7f72003-06-27 21:31:46 +00001614 Defining this option enables DataFlash features and
1615 allows to read/write in Dataflash via the standard
1616 commands cp, md...
wdenk2abbe072003-06-16 23:50:08 +00001617
wdenk3f85ce22004-02-23 16:11:30 +00001618- SystemACE Support:
1619 CONFIG_SYSTEMACE
1620
1621 Adding this option adds support for Xilinx SystemACE
1622 chips attached via some sort of local bus. The address
1623 of the chip must alsh be defined in the
1624 CFG_SYSTEMACE_BASE macro. For example:
1625
1626 #define CONFIG_SYSTEMACE
1627 #define CFG_SYSTEMACE_BASE 0xf0000000
1628
1629 When SystemACE support is added, the "ace" device type
1630 becomes available to the fat commands, i.e. fatls.
1631
Wolfgang Denkecb0ccd2005-09-24 22:37:32 +02001632- TFTP Fixed UDP Port:
1633 CONFIG_TFTP_PORT
1634
Wolfgang Denk28cb9372005-09-24 23:25:46 +02001635 If this is defined, the environment variable tftpsrcp
Wolfgang Denkecb0ccd2005-09-24 22:37:32 +02001636 is used to supply the TFTP UDP source port value.
Wolfgang Denk28cb9372005-09-24 23:25:46 +02001637 If tftpsrcp isn't defined, the normal pseudo-random port
Wolfgang Denkecb0ccd2005-09-24 22:37:32 +02001638 number generator is used.
1639
Wolfgang Denk28cb9372005-09-24 23:25:46 +02001640 Also, the environment variable tftpdstp is used to supply
1641 the TFTP UDP destination port value. If tftpdstp isn't
1642 defined, the normal port 69 is used.
1643
1644 The purpose for tftpsrcp is to allow a TFTP server to
Wolfgang Denkecb0ccd2005-09-24 22:37:32 +02001645 blindly start the TFTP transfer using the pre-configured
1646 target IP address and UDP port. This has the effect of
1647 "punching through" the (Windows XP) firewall, allowing
1648 the remainder of the TFTP transfer to proceed normally.
1649 A better solution is to properly configure the firewall,
1650 but sometimes that is not allowed.
1651
wdenka8c7c702003-12-06 19:49:23 +00001652- Show boot progress:
wdenkc6097192002-11-03 00:24:07 +00001653 CONFIG_SHOW_BOOT_PROGRESS
1654
wdenk43d96162003-03-06 00:02:04 +00001655 Defining this option allows to add some board-
1656 specific code (calling a user-provided function
1657 "show_boot_progress(int)") that enables you to show
1658 the system's boot progress on some display (for
1659 example, some LED's) on your board. At the moment,
1660 the following checkpoints are implemented:
wdenkc6097192002-11-03 00:24:07 +00001661
1662 Arg Where When
1663 1 common/cmd_bootm.c before attempting to boot an image
wdenkba56f622004-02-06 23:19:44 +00001664 -1 common/cmd_bootm.c Image header has bad magic number
wdenkc6097192002-11-03 00:24:07 +00001665 2 common/cmd_bootm.c Image header has correct magic number
wdenkba56f622004-02-06 23:19:44 +00001666 -2 common/cmd_bootm.c Image header has bad checksum
wdenkc6097192002-11-03 00:24:07 +00001667 3 common/cmd_bootm.c Image header has correct checksum
wdenkba56f622004-02-06 23:19:44 +00001668 -3 common/cmd_bootm.c Image data has bad checksum
wdenkc6097192002-11-03 00:24:07 +00001669 4 common/cmd_bootm.c Image data has correct checksum
1670 -4 common/cmd_bootm.c Image is for unsupported architecture
1671 5 common/cmd_bootm.c Architecture check OK
1672 -5 common/cmd_bootm.c Wrong Image Type (not kernel, multi, standalone)
1673 6 common/cmd_bootm.c Image Type check OK
1674 -6 common/cmd_bootm.c gunzip uncompression error
1675 -7 common/cmd_bootm.c Unimplemented compression type
1676 7 common/cmd_bootm.c Uncompression OK
1677 -8 common/cmd_bootm.c Wrong Image Type (not kernel, multi, standalone)
1678 8 common/cmd_bootm.c Image Type check OK
1679 -9 common/cmd_bootm.c Unsupported OS (not Linux, BSD, VxWorks, QNX)
1680 9 common/cmd_bootm.c Start initial ramdisk verification
wdenkba56f622004-02-06 23:19:44 +00001681 -10 common/cmd_bootm.c Ramdisk header has bad magic number
1682 -11 common/cmd_bootm.c Ramdisk header has bad checksum
wdenkc6097192002-11-03 00:24:07 +00001683 10 common/cmd_bootm.c Ramdisk header is OK
wdenkba56f622004-02-06 23:19:44 +00001684 -12 common/cmd_bootm.c Ramdisk data has bad checksum
wdenkc6097192002-11-03 00:24:07 +00001685 11 common/cmd_bootm.c Ramdisk data has correct checksum
1686 12 common/cmd_bootm.c Ramdisk verification complete, start loading
1687 -13 common/cmd_bootm.c Wrong Image Type (not PPC Linux Ramdisk)
1688 13 common/cmd_bootm.c Start multifile image verification
1689 14 common/cmd_bootm.c No initial ramdisk, no multifile, continue.
1690 15 common/cmd_bootm.c All preparation done, transferring control to OS
1691
wdenk11dadd52004-02-27 00:07:27 +00001692 -30 lib_ppc/board.c Fatal error, hang the system
1693 -31 post/post.c POST test failed, detected by post_output_backlog()
1694 -32 post/post.c POST test failed, detected by post_run_single()
wdenk63e73c92004-02-23 22:22:28 +00001695
Heiko Schocher566a4942007-06-22 19:11:54 +02001696 34 common/cmd_doc.c before loading a Image from a DOC device
1697 -35 common/cmd_doc.c Bad usage of "doc" command
1698 35 common/cmd_doc.c correct usage of "doc" command
1699 -36 common/cmd_doc.c No boot device
1700 36 common/cmd_doc.c correct boot device
1701 -37 common/cmd_doc.c Unknown Chip ID on boot device
1702 37 common/cmd_doc.c correct chip ID found, device available
1703 -38 common/cmd_doc.c Read Error on boot device
1704 38 common/cmd_doc.c reading Image header from DOC device OK
1705 -39 common/cmd_doc.c Image header has bad magic number
1706 39 common/cmd_doc.c Image header has correct magic number
1707 -40 common/cmd_doc.c Error reading Image from DOC device
1708 40 common/cmd_doc.c Image header has correct magic number
1709 41 common/cmd_ide.c before loading a Image from a IDE device
1710 -42 common/cmd_ide.c Bad usage of "ide" command
1711 42 common/cmd_ide.c correct usage of "ide" command
1712 -43 common/cmd_ide.c No boot device
1713 43 common/cmd_ide.c boot device found
1714 -44 common/cmd_ide.c Device not available
1715 44 common/cmd_ide.c Device available
1716 -45 common/cmd_ide.c wrong partition selected
1717 45 common/cmd_ide.c partition selected
1718 -46 common/cmd_ide.c Unknown partition table
1719 46 common/cmd_ide.c valid partition table found
1720 -47 common/cmd_ide.c Invalid partition type
1721 47 common/cmd_ide.c correct partition type
1722 -48 common/cmd_ide.c Error reading Image Header on boot device
1723 48 common/cmd_ide.c reading Image Header from IDE device OK
1724 -49 common/cmd_ide.c Image header has bad magic number
1725 49 common/cmd_ide.c Image header has correct magic number
1726 -50 common/cmd_ide.c Image header has bad checksum
1727 50 common/cmd_ide.c Image header has correct checksum
1728 -51 common/cmd_ide.c Error reading Image from IDE device
1729 51 common/cmd_ide.c reading Image from IDE device OK
1730 52 common/cmd_nand.c before loading a Image from a NAND device
1731 -53 common/cmd_nand.c Bad usage of "nand" command
1732 53 common/cmd_nand.c correct usage of "nand" command
1733 -54 common/cmd_nand.c No boot device
1734 54 common/cmd_nand.c boot device found
1735 -55 common/cmd_nand.c Unknown Chip ID on boot device
1736 55 common/cmd_nand.c correct chip ID found, device available
1737 -56 common/cmd_nand.c Error reading Image Header on boot device
1738 56 common/cmd_nand.c reading Image Header from NAND device OK
1739 -57 common/cmd_nand.c Image header has bad magic number
1740 57 common/cmd_nand.c Image header has correct magic number
1741 -58 common/cmd_nand.c Error reading Image from NAND device
1742 58 common/cmd_nand.c reading Image from NAND device OK
wdenkc6097192002-11-03 00:24:07 +00001743
Heiko Schocher566a4942007-06-22 19:11:54 +02001744 -60 common/env_common.c Environment has a bad CRC, using default
wdenkc6097192002-11-03 00:24:07 +00001745
Heiko Schocher566a4942007-06-22 19:11:54 +02001746 64 net/eth.c starting with Ethernetconfiguration.
1747 -64 net/eth.c no Ethernet found.
1748 65 net/eth.c Ethernet found.
wdenk206c60c2003-09-18 10:02:25 +00001749
Heiko Schocher566a4942007-06-22 19:11:54 +02001750 -80 common/cmd_net.c usage wrong
1751 80 common/cmd_net.c before calling NetLoop()
1752 -81 common/cmd_net.c some error in NetLoop() occured
1753 81 common/cmd_net.c NetLoop() back without error
1754 -82 common/cmd_net.c size == 0 (File with size 0 loaded)
1755 82 common/cmd_net.c trying automatic boot
1756 83 common/cmd_net.c running autoscript
1757 -83 common/cmd_net.c some error in automatic boot or autoscript
1758 84 common/cmd_net.c end without errors
wdenkc6097192002-11-03 00:24:07 +00001759
1760Modem Support:
1761--------------
1762
wdenk85ec0bc2003-03-31 16:34:49 +00001763[so far only for SMDK2400 and TRAB boards]
wdenkc6097192002-11-03 00:24:07 +00001764
1765- Modem support endable:
1766 CONFIG_MODEM_SUPPORT
1767
1768- RTS/CTS Flow control enable:
1769 CONFIG_HWFLOW
1770
1771- Modem debug support:
1772 CONFIG_MODEM_SUPPORT_DEBUG
1773
wdenk43d96162003-03-06 00:02:04 +00001774 Enables debugging stuff (char screen[1024], dbg())
1775 for modem support. Useful only with BDI2000.
wdenkc6097192002-11-03 00:24:07 +00001776
wdenka8c7c702003-12-06 19:49:23 +00001777- Interrupt support (PPC):
1778
wdenkd4ca31c2004-01-02 14:00:00 +00001779 There are common interrupt_init() and timer_interrupt()
1780 for all PPC archs. interrupt_init() calls interrupt_init_cpu()
1781 for cpu specific initialization. interrupt_init_cpu()
1782 should set decrementer_count to appropriate value. If
1783 cpu resets decrementer automatically after interrupt
1784 (ppc4xx) it should set decrementer_count to zero.
1785 timer_interrupt() calls timer_interrupt_cpu() for cpu
1786 specific handling. If board has watchdog / status_led
1787 / other_activity_monitor it works automatically from
1788 general timer_interrupt().
wdenka8c7c702003-12-06 19:49:23 +00001789
wdenkc6097192002-11-03 00:24:07 +00001790- General:
1791
wdenk43d96162003-03-06 00:02:04 +00001792 In the target system modem support is enabled when a
1793 specific key (key combination) is pressed during
1794 power-on. Otherwise U-Boot will boot normally
1795 (autoboot). The key_pressed() fuction is called from
1796 board_init(). Currently key_pressed() is a dummy
1797 function, returning 1 and thus enabling modem
1798 initialization.
wdenkc6097192002-11-03 00:24:07 +00001799
wdenk43d96162003-03-06 00:02:04 +00001800 If there are no modem init strings in the
1801 environment, U-Boot proceed to autoboot; the
1802 previous output (banner, info printfs) will be
1803 supressed, though.
wdenkc6097192002-11-03 00:24:07 +00001804
1805 See also: doc/README.Modem
1806
1807
wdenkc6097192002-11-03 00:24:07 +00001808Configuration Settings:
1809-----------------------
1810
1811- CFG_LONGHELP: Defined when you want long help messages included;
1812 undefine this when you're short of memory.
1813
1814- CFG_PROMPT: This is what U-Boot prints on the console to
1815 prompt for user input.
1816
1817- CFG_CBSIZE: Buffer size for input from the Console
1818
1819- CFG_PBSIZE: Buffer size for Console output
1820
1821- CFG_MAXARGS: max. Number of arguments accepted for monitor commands
1822
1823- CFG_BARGSIZE: Buffer size for Boot Arguments which are passed to
1824 the application (usually a Linux kernel) when it is
1825 booted
1826
1827- CFG_BAUDRATE_TABLE:
1828 List of legal baudrate settings for this board.
1829
1830- CFG_CONSOLE_INFO_QUIET
wdenk8bde7f72003-06-27 21:31:46 +00001831 Suppress display of console information at boot.
wdenkc6097192002-11-03 00:24:07 +00001832
1833- CFG_CONSOLE_IS_IN_ENV
wdenk8bde7f72003-06-27 21:31:46 +00001834 If the board specific function
1835 extern int overwrite_console (void);
1836 returns 1, the stdin, stderr and stdout are switched to the
wdenkc6097192002-11-03 00:24:07 +00001837 serial port, else the settings in the environment are used.
1838
1839- CFG_CONSOLE_OVERWRITE_ROUTINE
wdenk8bde7f72003-06-27 21:31:46 +00001840 Enable the call to overwrite_console().
wdenkc6097192002-11-03 00:24:07 +00001841
1842- CFG_CONSOLE_ENV_OVERWRITE
1843 Enable overwrite of previous console environment settings.
1844
1845- CFG_MEMTEST_START, CFG_MEMTEST_END:
1846 Begin and End addresses of the area used by the
1847 simple memory test.
1848
1849- CFG_ALT_MEMTEST:
wdenk8bde7f72003-06-27 21:31:46 +00001850 Enable an alternate, more extensive memory test.
wdenkc6097192002-11-03 00:24:07 +00001851
wdenk5f535fe2003-09-18 09:21:33 +00001852- CFG_MEMTEST_SCRATCH:
1853 Scratch address used by the alternate memory test
1854 You only need to set this if address zero isn't writeable
1855
wdenkc6097192002-11-03 00:24:07 +00001856- CFG_TFTP_LOADADDR:
1857 Default load address for network file downloads
1858
1859- CFG_LOADS_BAUD_CHANGE:
1860 Enable temporary baudrate change while serial download
1861
1862- CFG_SDRAM_BASE:
1863 Physical start address of SDRAM. _Must_ be 0 here.
1864
1865- CFG_MBIO_BASE:
1866 Physical start address of Motherboard I/O (if using a
1867 Cogent motherboard)
1868
1869- CFG_FLASH_BASE:
1870 Physical start address of Flash memory.
1871
1872- CFG_MONITOR_BASE:
1873 Physical start address of boot monitor code (set by
1874 make config files to be same as the text base address
1875 (TEXT_BASE) used when linking) - same as
1876 CFG_FLASH_BASE when booting from flash.
1877
1878- CFG_MONITOR_LEN:
wdenk8bde7f72003-06-27 21:31:46 +00001879 Size of memory reserved for monitor code, used to
1880 determine _at_compile_time_ (!) if the environment is
1881 embedded within the U-Boot image, or in a separate
1882 flash sector.
wdenkc6097192002-11-03 00:24:07 +00001883
1884- CFG_MALLOC_LEN:
1885 Size of DRAM reserved for malloc() use.
1886
Stefan Roese15940c92006-03-13 11:16:36 +01001887- CFG_BOOTM_LEN:
1888 Normally compressed uImages are limited to an
1889 uncompressed size of 8 MBytes. If this is not enough,
1890 you can define CFG_BOOTM_LEN in your board config file
1891 to adjust this setting to your needs.
1892
wdenkc6097192002-11-03 00:24:07 +00001893- CFG_BOOTMAPSZ:
1894 Maximum size of memory mapped by the startup code of
1895 the Linux kernel; all data that must be processed by
1896 the Linux kernel (bd_info, boot arguments, eventually
1897 initrd image) must be put below this limit.
1898
1899- CFG_MAX_FLASH_BANKS:
1900 Max number of Flash memory banks
1901
1902- CFG_MAX_FLASH_SECT:
1903 Max number of sectors on a Flash chip
1904
1905- CFG_FLASH_ERASE_TOUT:
1906 Timeout for Flash erase operations (in ms)
1907
1908- CFG_FLASH_WRITE_TOUT:
1909 Timeout for Flash write operations (in ms)
1910
wdenk8564acf2003-07-14 22:13:32 +00001911- CFG_FLASH_LOCK_TOUT
1912 Timeout for Flash set sector lock bit operation (in ms)
1913
1914- CFG_FLASH_UNLOCK_TOUT
1915 Timeout for Flash clear lock bits operation (in ms)
1916
1917- CFG_FLASH_PROTECTION
1918 If defined, hardware flash sectors protection is used
1919 instead of U-Boot software protection.
1920
wdenkc6097192002-11-03 00:24:07 +00001921- CFG_DIRECT_FLASH_TFTP:
1922
1923 Enable TFTP transfers directly to flash memory;
1924 without this option such a download has to be
1925 performed in two steps: (1) download to RAM, and (2)
1926 copy from RAM to flash.
1927
1928 The two-step approach is usually more reliable, since
1929 you can check if the download worked before you erase
1930 the flash, but in some situations (when sytem RAM is
1931 too limited to allow for a tempory copy of the
1932 downloaded image) this option may be very useful.
1933
1934- CFG_FLASH_CFI:
wdenk43d96162003-03-06 00:02:04 +00001935 Define if the flash driver uses extra elements in the
wdenk5653fc32004-02-08 22:55:38 +00001936 common flash structure for storing flash geometry.
1937
1938- CFG_FLASH_CFI_DRIVER
1939 This option also enables the building of the cfi_flash driver
1940 in the drivers directory
wdenkc6097192002-11-03 00:24:07 +00001941
Stefan Roese5568e612005-11-22 13:20:42 +01001942- CFG_FLASH_QUIET_TEST
1943 If this option is defined, the common CFI flash doesn't
1944 print it's warning upon not recognized FLASH banks. This
1945 is useful, if some of the configured banks are only
1946 optionally available.
1947
stroese53cf9432003-06-05 15:39:44 +00001948- CFG_RX_ETH_BUFFER:
1949 Defines the number of ethernet receive buffers. On some
1950 ethernet controllers it is recommended to set this value
1951 to 8 or even higher (EEPRO100 or 405 EMAC), since all
1952 buffers can be full shortly after enabling the interface
1953 on high ethernet traffic.
1954 Defaults to 4 if not defined.
1955
wdenkc6097192002-11-03 00:24:07 +00001956The following definitions that deal with the placement and management
1957of environment data (variable area); in general, we support the
1958following configurations:
1959
1960- CFG_ENV_IS_IN_FLASH:
1961
1962 Define this if the environment is in flash memory.
1963
1964 a) The environment occupies one whole flash sector, which is
1965 "embedded" in the text segment with the U-Boot code. This
1966 happens usually with "bottom boot sector" or "top boot
1967 sector" type flash chips, which have several smaller
1968 sectors at the start or the end. For instance, such a
1969 layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In
1970 such a case you would place the environment in one of the
1971 4 kB sectors - with U-Boot code before and after it. With
1972 "top boot sector" type flash chips, you would put the
1973 environment in one of the last sectors, leaving a gap
1974 between U-Boot and the environment.
1975
1976 - CFG_ENV_OFFSET:
1977
1978 Offset of environment data (variable area) to the
1979 beginning of flash memory; for instance, with bottom boot
1980 type flash chips the second sector can be used: the offset
1981 for this sector is given here.
1982
1983 CFG_ENV_OFFSET is used relative to CFG_FLASH_BASE.
1984
1985 - CFG_ENV_ADDR:
1986
1987 This is just another way to specify the start address of
1988 the flash sector containing the environment (instead of
1989 CFG_ENV_OFFSET).
1990
1991 - CFG_ENV_SECT_SIZE:
1992
1993 Size of the sector containing the environment.
1994
1995
1996 b) Sometimes flash chips have few, equal sized, BIG sectors.
1997 In such a case you don't want to spend a whole sector for
1998 the environment.
1999
2000 - CFG_ENV_SIZE:
2001
2002 If you use this in combination with CFG_ENV_IS_IN_FLASH
2003 and CFG_ENV_SECT_SIZE, you can specify to use only a part
2004 of this flash sector for the environment. This saves
2005 memory for the RAM copy of the environment.
2006
2007 It may also save flash memory if you decide to use this
2008 when your environment is "embedded" within U-Boot code,
2009 since then the remainder of the flash sector could be used
2010 for U-Boot code. It should be pointed out that this is
2011 STRONGLY DISCOURAGED from a robustness point of view:
2012 updating the environment in flash makes it always
2013 necessary to erase the WHOLE sector. If something goes
2014 wrong before the contents has been restored from a copy in
2015 RAM, your target system will be dead.
2016
2017 - CFG_ENV_ADDR_REDUND
2018 CFG_ENV_SIZE_REDUND
2019
wdenk43d96162003-03-06 00:02:04 +00002020 These settings describe a second storage area used to hold
2021 a redundand copy of the environment data, so that there is
wdenk3e386912003-04-05 00:53:31 +00002022 a valid backup copy in case there is a power failure during
wdenk43d96162003-03-06 00:02:04 +00002023 a "saveenv" operation.
wdenkc6097192002-11-03 00:24:07 +00002024
2025BE CAREFUL! Any changes to the flash layout, and some changes to the
2026source code will make it necessary to adapt <board>/u-boot.lds*
2027accordingly!
2028
2029
2030- CFG_ENV_IS_IN_NVRAM:
2031
2032 Define this if you have some non-volatile memory device
2033 (NVRAM, battery buffered SRAM) which you want to use for the
2034 environment.
2035
2036 - CFG_ENV_ADDR:
2037 - CFG_ENV_SIZE:
2038
2039 These two #defines are used to determin the memory area you
2040 want to use for environment. It is assumed that this memory
2041 can just be read and written to, without any special
2042 provision.
2043
2044BE CAREFUL! The first access to the environment happens quite early
2045in U-Boot initalization (when we try to get the setting of for the
2046console baudrate). You *MUST* have mappend your NVRAM area then, or
2047U-Boot will hang.
2048
2049Please note that even with NVRAM we still use a copy of the
2050environment in RAM: we could work on NVRAM directly, but we want to
2051keep settings there always unmodified except somebody uses "saveenv"
2052to save the current settings.
2053
2054
2055- CFG_ENV_IS_IN_EEPROM:
2056
2057 Use this if you have an EEPROM or similar serial access
2058 device and a driver for it.
2059
2060 - CFG_ENV_OFFSET:
2061 - CFG_ENV_SIZE:
2062
2063 These two #defines specify the offset and size of the
2064 environment area within the total memory of your EEPROM.
2065
2066 - CFG_I2C_EEPROM_ADDR:
2067 If defined, specified the chip address of the EEPROM device.
2068 The default address is zero.
2069
2070 - CFG_EEPROM_PAGE_WRITE_BITS:
2071 If defined, the number of bits used to address bytes in a
2072 single page in the EEPROM device. A 64 byte page, for example
2073 would require six bits.
2074
2075 - CFG_EEPROM_PAGE_WRITE_DELAY_MS:
2076 If defined, the number of milliseconds to delay between
wdenkba56f622004-02-06 23:19:44 +00002077 page writes. The default is zero milliseconds.
wdenkc6097192002-11-03 00:24:07 +00002078
2079 - CFG_I2C_EEPROM_ADDR_LEN:
2080 The length in bytes of the EEPROM memory array address. Note
2081 that this is NOT the chip address length!
2082
wdenk5cf91d62004-04-23 20:32:05 +00002083 - CFG_I2C_EEPROM_ADDR_OVERFLOW:
2084 EEPROM chips that implement "address overflow" are ones
2085 like Catalyst 24WC04/08/16 which has 9/10/11 bits of
2086 address and the extra bits end up in the "chip address" bit
2087 slots. This makes a 24WC08 (1Kbyte) chip look like four 256
2088 byte chips.
2089
2090 Note that we consider the length of the address field to
2091 still be one byte because the extra address bits are hidden
2092 in the chip address.
2093
wdenkc6097192002-11-03 00:24:07 +00002094 - CFG_EEPROM_SIZE:
2095 The size in bytes of the EEPROM device.
2096
wdenkc6097192002-11-03 00:24:07 +00002097
wdenk5779d8d2003-12-06 23:55:10 +00002098- CFG_ENV_IS_IN_DATAFLASH:
2099
wdenkd4ca31c2004-01-02 14:00:00 +00002100 Define this if you have a DataFlash memory device which you
wdenk5779d8d2003-12-06 23:55:10 +00002101 want to use for the environment.
2102
2103 - CFG_ENV_OFFSET:
2104 - CFG_ENV_ADDR:
2105 - CFG_ENV_SIZE:
2106
2107 These three #defines specify the offset and size of the
2108 environment area within the total memory of your DataFlash placed
2109 at the specified address.
2110
wdenk13a56952004-06-09 14:58:14 +00002111- CFG_ENV_IS_IN_NAND:
2112
2113 Define this if you have a NAND device which you want to use
2114 for the environment.
2115
2116 - CFG_ENV_OFFSET:
2117 - CFG_ENV_SIZE:
2118
2119 These two #defines specify the offset and size of the environment
2120 area within the first NAND device.
wdenk5779d8d2003-12-06 23:55:10 +00002121
Markus Klotzbuechere443c942006-03-20 18:02:44 +01002122 - CFG_ENV_OFFSET_REDUND
2123
2124 This setting describes a second storage area of CFG_ENV_SIZE
2125 size used to hold a redundant copy of the environment data,
2126 so that there is a valid backup copy in case there is a
2127 power failure during a "saveenv" operation.
2128
2129 Note: CFG_ENV_OFFSET and CFG_ENV_OFFSET_REDUND must be aligned
2130 to a block boundary, and CFG_ENV_SIZE must be a multiple of
2131 the NAND devices block size.
2132
wdenkc6097192002-11-03 00:24:07 +00002133- CFG_SPI_INIT_OFFSET
2134
2135 Defines offset to the initial SPI buffer area in DPRAM. The
2136 area is used at an early stage (ROM part) if the environment
2137 is configured to reside in the SPI EEPROM: We need a 520 byte
2138 scratch DPRAM area. It is used between the two initialization
2139 calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems
2140 to be a good choice since it makes it far enough from the
2141 start of the data area as well as from the stack pointer.
2142
Bruce Adlere881cb52007-11-02 13:15:42 -07002143Please note that the environment is read-only until the monitor
wdenkc6097192002-11-03 00:24:07 +00002144has been relocated to RAM and a RAM copy of the environment has been
2145created; also, when using EEPROM you will have to use getenv_r()
2146until then to read environment variables.
2147
wdenk85ec0bc2003-03-31 16:34:49 +00002148The environment is protected by a CRC32 checksum. Before the monitor
2149is relocated into RAM, as a result of a bad CRC you will be working
2150with the compiled-in default environment - *silently*!!! [This is
2151necessary, because the first environment variable we need is the
2152"baudrate" setting for the console - if we have a bad CRC, we don't
2153have any device yet where we could complain.]
wdenkc6097192002-11-03 00:24:07 +00002154
2155Note: once the monitor has been relocated, then it will complain if
2156the default environment is used; a new CRC is computed as soon as you
wdenk85ec0bc2003-03-31 16:34:49 +00002157use the "saveenv" command to store a valid environment.
wdenkc6097192002-11-03 00:24:07 +00002158
wdenkfc3e2162003-10-08 22:33:00 +00002159- CFG_FAULT_ECHO_LINK_DOWN:
wdenk42d1f032003-10-15 23:53:47 +00002160 Echo the inverted Ethernet link state to the fault LED.
wdenkfc3e2162003-10-08 22:33:00 +00002161
2162 Note: If this option is active, then CFG_FAULT_MII_ADDR
2163 also needs to be defined.
2164
2165- CFG_FAULT_MII_ADDR:
wdenk42d1f032003-10-15 23:53:47 +00002166 MII address of the PHY to check for the Ethernet link state.
wdenkc6097192002-11-03 00:24:07 +00002167
wdenkc40b2952004-03-13 23:29:43 +00002168- CFG_64BIT_VSPRINTF:
2169 Makes vsprintf (and all *printf functions) support printing
2170 of 64bit values by using the L quantifier
2171
2172- CFG_64BIT_STRTOUL:
2173 Adds simple_strtoull that returns a 64bit value
2174
wdenkc6097192002-11-03 00:24:07 +00002175Low Level (hardware related) configuration options:
wdenkdc7c9a12003-03-26 06:55:25 +00002176---------------------------------------------------
wdenkc6097192002-11-03 00:24:07 +00002177
2178- CFG_CACHELINE_SIZE:
2179 Cache Line Size of the CPU.
2180
2181- CFG_DEFAULT_IMMR:
2182 Default address of the IMMR after system reset.
wdenk2535d602003-07-17 23:16:40 +00002183
wdenk42d1f032003-10-15 23:53:47 +00002184 Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU,
2185 and RPXsuper) to be able to adjust the position of
2186 the IMMR register after a reset.
wdenkc6097192002-11-03 00:24:07 +00002187
wdenk7f6c2cb2002-11-10 22:06:23 +00002188- Floppy Disk Support:
2189 CFG_FDC_DRIVE_NUMBER
2190
2191 the default drive number (default value 0)
2192
2193 CFG_ISA_IO_STRIDE
2194
2195 defines the spacing between fdc chipset registers
2196 (default value 1)
2197
2198 CFG_ISA_IO_OFFSET
2199
wdenk43d96162003-03-06 00:02:04 +00002200 defines the offset of register from address. It
2201 depends on which part of the data bus is connected to
2202 the fdc chipset. (default value 0)
wdenk7f6c2cb2002-11-10 22:06:23 +00002203
wdenk43d96162003-03-06 00:02:04 +00002204 If CFG_ISA_IO_STRIDE CFG_ISA_IO_OFFSET and
2205 CFG_FDC_DRIVE_NUMBER are undefined, they take their
2206 default value.
wdenk7f6c2cb2002-11-10 22:06:23 +00002207
wdenk43d96162003-03-06 00:02:04 +00002208 if CFG_FDC_HW_INIT is defined, then the function
2209 fdc_hw_init() is called at the beginning of the FDC
2210 setup. fdc_hw_init() must be provided by the board
2211 source code. It is used to make hardware dependant
2212 initializations.
wdenk7f6c2cb2002-11-10 22:06:23 +00002213
wdenk25d67122004-12-10 11:40:40 +00002214- CFG_IMMR: Physical address of the Internal Memory.
wdenkefe2a4d2004-12-16 21:44:03 +00002215 DO NOT CHANGE unless you know exactly what you're
wdenk25d67122004-12-10 11:40:40 +00002216 doing! (11-4) [MPC8xx/82xx systems only]
wdenkc6097192002-11-03 00:24:07 +00002217
2218- CFG_INIT_RAM_ADDR:
2219
wdenk7152b1d2003-09-05 23:19:14 +00002220 Start address of memory area that can be used for
wdenkc6097192002-11-03 00:24:07 +00002221 initial data and stack; please note that this must be
2222 writable memory that is working WITHOUT special
2223 initialization, i. e. you CANNOT use normal RAM which
2224 will become available only after programming the
2225 memory controller and running certain initialization
2226 sequences.
2227
2228 U-Boot uses the following memory types:
2229 - MPC8xx and MPC8260: IMMR (internal memory of the CPU)
2230 - MPC824X: data cache
2231 - PPC4xx: data cache
2232
wdenk85ec0bc2003-03-31 16:34:49 +00002233- CFG_GBL_DATA_OFFSET:
wdenkc6097192002-11-03 00:24:07 +00002234
2235 Offset of the initial data structure in the memory
2236 area defined by CFG_INIT_RAM_ADDR. Usually
wdenk85ec0bc2003-03-31 16:34:49 +00002237 CFG_GBL_DATA_OFFSET is chosen such that the initial
wdenkc6097192002-11-03 00:24:07 +00002238 data is located at the end of the available space
2239 (sometimes written as (CFG_INIT_RAM_END -
2240 CFG_INIT_DATA_SIZE), and the initial stack is just
2241 below that area (growing from (CFG_INIT_RAM_ADDR +
wdenk85ec0bc2003-03-31 16:34:49 +00002242 CFG_GBL_DATA_OFFSET) downward.
wdenkc6097192002-11-03 00:24:07 +00002243
2244 Note:
2245 On the MPC824X (or other systems that use the data
2246 cache for initial memory) the address chosen for
2247 CFG_INIT_RAM_ADDR is basically arbitrary - it must
2248 point to an otherwise UNUSED address space between
2249 the top of RAM and the start of the PCI space.
2250
2251- CFG_SIUMCR: SIU Module Configuration (11-6)
2252
2253- CFG_SYPCR: System Protection Control (11-9)
2254
2255- CFG_TBSCR: Time Base Status and Control (11-26)
2256
2257- CFG_PISCR: Periodic Interrupt Status and Control (11-31)
2258
2259- CFG_PLPRCR: PLL, Low-Power, and Reset Control Register (15-30)
2260
2261- CFG_SCCR: System Clock and reset Control Register (15-27)
2262
2263- CFG_OR_TIMING_SDRAM:
2264 SDRAM timing
2265
2266- CFG_MAMR_PTA:
2267 periodic timer for refresh
2268
2269- CFG_DER: Debug Event Register (37-47)
2270
2271- FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CFG_REMAP_OR_AM,
2272 CFG_PRELIM_OR_AM, CFG_OR_TIMING_FLASH, CFG_OR0_REMAP,
2273 CFG_OR0_PRELIM, CFG_BR0_PRELIM, CFG_OR1_REMAP, CFG_OR1_PRELIM,
2274 CFG_BR1_PRELIM:
2275 Memory Controller Definitions: BR0/1 and OR0/1 (FLASH)
2276
2277- SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE,
2278 CFG_OR_TIMING_SDRAM, CFG_OR2_PRELIM, CFG_BR2_PRELIM,
2279 CFG_OR3_PRELIM, CFG_BR3_PRELIM:
2280 Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM)
2281
2282- CFG_MAMR_PTA, CFG_MPTPR_2BK_4K, CFG_MPTPR_1BK_4K, CFG_MPTPR_2BK_8K,
2283 CFG_MPTPR_1BK_8K, CFG_MAMR_8COL, CFG_MAMR_9COL:
2284 Machine Mode Register and Memory Periodic Timer
2285 Prescaler definitions (SDRAM timing)
2286
2287- CFG_I2C_UCODE_PATCH, CFG_I2C_DPMEM_OFFSET [0x1FC0]:
2288 enable I2C microcode relocation patch (MPC8xx);
2289 define relocation offset in DPRAM [DSP2]
2290
Heiko Schocherb423d052008-01-11 01:12:07 +01002291- CFG_SMC_UCODE_PATCH, CFG_SMC_DPMEM_OFFSET [0x1FC0]:
2292 enable SMC microcode relocation patch (MPC8xx);
2293 define relocation offset in DPRAM [SMC1]
2294
wdenkc6097192002-11-03 00:24:07 +00002295- CFG_SPI_UCODE_PATCH, CFG_SPI_DPMEM_OFFSET [0x1FC0]:
2296 enable SPI microcode relocation patch (MPC8xx);
2297 define relocation offset in DPRAM [SCC4]
2298
2299- CFG_USE_OSCCLK:
2300 Use OSCM clock mode on MBX8xx board. Be careful,
2301 wrong setting might damage your board. Read
2302 doc/README.MBX before setting this variable!
2303
wdenkea909b72002-11-21 23:11:29 +00002304- CFG_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only)
wdenk43d96162003-03-06 00:02:04 +00002305 Offset of the bootmode word in DPRAM used by post
2306 (Power On Self Tests). This definition overrides
2307 #define'd default value in commproc.h resp.
2308 cpm_8260.h.
wdenkea909b72002-11-21 23:11:29 +00002309
stroese1d49b1f2003-05-23 11:39:05 +00002310- CFG_PCI_SLV_MEM_LOCAL, CFG_PCI_SLV_MEM_BUS, CFG_PICMR0_MASK_ATTRIB,
2311 CFG_PCI_MSTR0_LOCAL, CFG_PCIMSK0_MASK, CFG_PCI_MSTR1_LOCAL,
2312 CFG_PCIMSK1_MASK, CFG_PCI_MSTR_MEM_LOCAL, CFG_PCI_MSTR_MEM_BUS,
2313 CFG_CPU_PCI_MEM_START, CFG_PCI_MSTR_MEM_SIZE, CFG_POCMR0_MASK_ATTRIB,
2314 CFG_PCI_MSTR_MEMIO_LOCAL, CFG_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START,
2315 CFG_PCI_MSTR_MEMIO_SIZE, CFG_POCMR1_MASK_ATTRIB, CFG_PCI_MSTR_IO_LOCAL,
2316 CFG_PCI_MSTR_IO_BUS, CFG_CPU_PCI_IO_START, CFG_PCI_MSTR_IO_SIZE,
wdenk5d232d02003-05-22 22:52:13 +00002317 CFG_POCMR2_MASK_ATTRIB: (MPC826x only)
2318 Overrides the default PCI memory map in cpu/mpc8260/pci.c if set.
2319
Ben Warrenbb99ad62006-09-07 16:50:54 -04002320- CONFIG_SPD_EEPROM
2321 Get DDR timing information from an I2C EEPROM. Common with pluggable
2322 memory modules such as SODIMMs
2323 SPD_EEPROM_ADDRESS
2324 I2C address of the SPD EEPROM
2325
2326- CFG_SPD_BUS_NUM
2327 If SPD EEPROM is on an I2C bus other than the first one, specify here.
2328 Note that the value must resolve to something your driver can deal with.
2329
Timur Tabi2ad6b512006-10-31 18:44:42 -06002330- CFG_83XX_DDR_USES_CS0
2331 Only for 83xx systems. If specified, then DDR should be configured
2332 using CS0 and CS1 instead of CS2 and CS3.
2333
2334- CFG_83XX_DDR_USES_CS0
2335 Only for 83xx systems. If specified, then DDR should be configured
2336 using CS0 and CS1 instead of CS2 and CS3.
2337
wdenkc26e4542004-04-18 10:13:26 +00002338- CONFIG_ETHER_ON_FEC[12]
2339 Define to enable FEC[12] on a 8xx series processor.
2340
2341- CONFIG_FEC[12]_PHY
2342 Define to the hardcoded PHY address which corresponds
wdenk6e592382004-04-18 17:39:38 +00002343 to the given FEC; i. e.
2344 #define CONFIG_FEC1_PHY 4
wdenkc26e4542004-04-18 10:13:26 +00002345 means that the PHY with address 4 is connected to FEC1
2346
2347 When set to -1, means to probe for first available.
2348
2349- CONFIG_FEC[12]_PHY_NORXERR
2350 The PHY does not have a RXERR line (RMII only).
2351 (so program the FEC to ignore it).
2352
2353- CONFIG_RMII
2354 Enable RMII mode for all FECs.
2355 Note that this is a global option, we can't
2356 have one FEC in standard MII mode and another in RMII mode.
2357
wdenk5cf91d62004-04-23 20:32:05 +00002358- CONFIG_CRC32_VERIFY
2359 Add a verify option to the crc32 command.
2360 The syntax is:
2361
2362 => crc32 -v <address> <count> <crc32>
2363
2364 Where address/count indicate a memory area
2365 and crc32 is the correct crc32 which the
2366 area should have.
2367
wdenk56523f12004-07-11 17:40:54 +00002368- CONFIG_LOOPW
2369 Add the "loopw" memory command. This only takes effect if
Jon Loeliger602ad3b2007-06-11 19:03:39 -05002370 the memory commands are activated globally (CONFIG_CMD_MEM).
wdenk56523f12004-07-11 17:40:54 +00002371
stroese7b466642004-12-16 18:46:55 +00002372- CONFIG_MX_CYCLIC
2373 Add the "mdc" and "mwc" memory commands. These are cyclic
2374 "md/mw" commands.
2375 Examples:
2376
wdenkefe2a4d2004-12-16 21:44:03 +00002377 => mdc.b 10 4 500
stroese7b466642004-12-16 18:46:55 +00002378 This command will print 4 bytes (10,11,12,13) each 500 ms.
2379
wdenkefe2a4d2004-12-16 21:44:03 +00002380 => mwc.l 100 12345678 10
stroese7b466642004-12-16 18:46:55 +00002381 This command will write 12345678 to address 100 all 10 ms.
2382
wdenkefe2a4d2004-12-16 21:44:03 +00002383 This only takes effect if the memory commands are activated
Jon Loeliger602ad3b2007-06-11 19:03:39 -05002384 globally (CONFIG_CMD_MEM).
stroese7b466642004-12-16 18:46:55 +00002385
wdenk8aa1a2d2005-04-04 12:44:11 +00002386- CONFIG_SKIP_LOWLEVEL_INIT
2387- CONFIG_SKIP_RELOCATE_UBOOT
2388
wdenk3c2b3d42005-04-05 23:32:21 +00002389 [ARM only] If these variables are defined, then
2390 certain low level initializations (like setting up
2391 the memory controller) are omitted and/or U-Boot does
2392 not relocate itself into RAM.
2393 Normally these variables MUST NOT be defined. The
2394 only exception is when U-Boot is loaded (to RAM) by
2395 some other boot loader or by a debugger which
2396 performs these intializations itself.
wdenk8aa1a2d2005-04-04 12:44:11 +00002397
wdenk400558b2005-04-02 23:52:25 +00002398
wdenkc6097192002-11-03 00:24:07 +00002399Building the Software:
2400======================
2401
2402Building U-Boot has been tested in native PPC environments (on a
2403PowerBook G3 running LinuxPPC 2000) and in cross environments
2404(running RedHat 6.x and 7.x Linux on x86, Solaris 2.6 on a SPARC, and
2405NetBSD 1.5 on x86).
2406
2407If you are not using a native PPC environment, it is assumed that you
2408have the GNU cross compiling tools available in your path and named
2409with a prefix of "powerpc-linux-". If this is not the case, (e.g. if
2410you are using Monta Vista's Hard Hat Linux CDK 1.2) you must change
2411the definition of CROSS_COMPILE in Makefile. For HHL on a 4xx CPU,
2412change it to:
2413
2414 CROSS_COMPILE = ppc_4xx-
2415
2416
wdenkba56f622004-02-06 23:19:44 +00002417U-Boot is intended to be simple to build. After installing the
wdenkc6097192002-11-03 00:24:07 +00002418sources you must configure U-Boot for one specific board type. This
2419is done by typing:
2420
2421 make NAME_config
2422
2423where "NAME_config" is the name of one of the existing
Kim Phillips26281142007-08-10 13:28:25 -05002424configurations; see the main Makefile for supported names.
wdenk54387ac2003-10-08 22:45:44 +00002425
wdenk2729af92004-05-03 20:45:30 +00002426Note: for some board special configuration names may exist; check if
2427 additional information is available from the board vendor; for
2428 instance, the TQM823L systems are available without (standard)
2429 or with LCD support. You can select such additional "features"
2430 when chosing the configuration, i. e.
wdenkc6097192002-11-03 00:24:07 +00002431
wdenk2729af92004-05-03 20:45:30 +00002432 make TQM823L_config
2433 - will configure for a plain TQM823L, i. e. no LCD support
wdenkc6097192002-11-03 00:24:07 +00002434
wdenk2729af92004-05-03 20:45:30 +00002435 make TQM823L_LCD_config
2436 - will configure for a TQM823L with U-Boot console on LCD
wdenkc6097192002-11-03 00:24:07 +00002437
wdenk2729af92004-05-03 20:45:30 +00002438 etc.
wdenkc6097192002-11-03 00:24:07 +00002439
wdenkc6097192002-11-03 00:24:07 +00002440
wdenk2729af92004-05-03 20:45:30 +00002441Finally, type "make all", and you should get some working U-Boot
2442images ready for download to / installation on your system:
wdenkc6097192002-11-03 00:24:07 +00002443
wdenk2729af92004-05-03 20:45:30 +00002444- "u-boot.bin" is a raw binary image
2445- "u-boot" is an image in ELF binary format
2446- "u-boot.srec" is in Motorola S-Record format
wdenkc6097192002-11-03 00:24:07 +00002447
Marian Balakowiczbaf31242006-09-07 17:25:40 +02002448By default the build is performed locally and the objects are saved
2449in the source directory. One of the two methods can be used to change
2450this behavior and build U-Boot to some external directory:
2451
24521. Add O= to the make command line invocations:
2453
2454 make O=/tmp/build distclean
2455 make O=/tmp/build NAME_config
2456 make O=/tmp/build all
2457
24582. Set environment variable BUILD_DIR to point to the desired location:
2459
2460 export BUILD_DIR=/tmp/build
2461 make distclean
2462 make NAME_config
2463 make all
2464
2465Note that the command line "O=" setting overrides the BUILD_DIR environment
2466variable.
2467
wdenkc6097192002-11-03 00:24:07 +00002468
wdenk2729af92004-05-03 20:45:30 +00002469Please be aware that the Makefiles assume you are using GNU make, so
2470for instance on NetBSD you might need to use "gmake" instead of
2471native "make".
wdenkc6097192002-11-03 00:24:07 +00002472
wdenkc6097192002-11-03 00:24:07 +00002473
wdenk2729af92004-05-03 20:45:30 +00002474If the system board that you have is not listed, then you will need
2475to port U-Boot to your hardware platform. To do this, follow these
2476steps:
wdenkc6097192002-11-03 00:24:07 +00002477
wdenk2729af92004-05-03 20:45:30 +000024781. Add a new configuration option for your board to the toplevel
2479 "Makefile" and to the "MAKEALL" script, using the existing
2480 entries as examples. Note that here and at many other places
2481 boards and other names are listed in alphabetical sort order. Please
2482 keep this order.
24832. Create a new directory to hold your board specific code. Add any
2484 files you need. In your board directory, you will need at least
2485 the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds".
24863. Create a new configuration file "include/configs/<board>.h" for
2487 your board
24883. If you're porting U-Boot to a new CPU, then also create a new
2489 directory to hold your CPU specific code. Add any files you need.
24904. Run "make <board>_config" with your new name.
24915. Type "make", and you should get a working "u-boot.srec" file
2492 to be installed on your target system.
24936. Debug and solve any problems that might arise.
2494 [Of course, this last step is much harder than it sounds.]
wdenkc6097192002-11-03 00:24:07 +00002495
wdenkc6097192002-11-03 00:24:07 +00002496
wdenk2729af92004-05-03 20:45:30 +00002497Testing of U-Boot Modifications, Ports to New Hardware, etc.:
2498==============================================================
wdenkc6097192002-11-03 00:24:07 +00002499
wdenk2729af92004-05-03 20:45:30 +00002500If you have modified U-Boot sources (for instance added a new board
2501or support for new devices, a new CPU, etc.) you are expected to
2502provide feedback to the other developers. The feedback normally takes
2503the form of a "patch", i. e. a context diff against a certain (latest
2504official or latest in CVS) version of U-Boot sources.
wdenkc6097192002-11-03 00:24:07 +00002505
wdenk2729af92004-05-03 20:45:30 +00002506But before you submit such a patch, please verify that your modifi-
2507cation did not break existing code. At least make sure that *ALL* of
2508the supported boards compile WITHOUT ANY compiler warnings. To do so,
2509just run the "MAKEALL" script, which will configure and build U-Boot
2510for ALL supported system. Be warned, this will take a while. You can
2511select which (cross) compiler to use by passing a `CROSS_COMPILE'
2512environment variable to the script, i. e. to use the cross tools from
2513MontaVista's Hard Hat Linux you can type
wdenkc6097192002-11-03 00:24:07 +00002514
wdenk2729af92004-05-03 20:45:30 +00002515 CROSS_COMPILE=ppc_8xx- MAKEALL
wdenkc6097192002-11-03 00:24:07 +00002516
wdenk2729af92004-05-03 20:45:30 +00002517or to build on a native PowerPC system you can type
wdenkc6097192002-11-03 00:24:07 +00002518
wdenk2729af92004-05-03 20:45:30 +00002519 CROSS_COMPILE=' ' MAKEALL
wdenkc6097192002-11-03 00:24:07 +00002520
Marian Balakowiczbaf31242006-09-07 17:25:40 +02002521When using the MAKEALL script, the default behaviour is to build U-Boot
2522in the source directory. This location can be changed by setting the
2523BUILD_DIR environment variable. Also, for each target built, the MAKEALL
2524script saves two log files (<target>.ERR and <target>.MAKEALL) in the
2525<source dir>/LOG directory. This default location can be changed by
2526setting the MAKEALL_LOGDIR environment variable. For example:
2527
2528 export BUILD_DIR=/tmp/build
2529 export MAKEALL_LOGDIR=/tmp/log
2530 CROSS_COMPILE=ppc_8xx- MAKEALL
2531
2532With the above settings build objects are saved in the /tmp/build, log
2533files are saved in the /tmp/log and the source tree remains clean during
2534the whole build process.
2535
2536
wdenk2729af92004-05-03 20:45:30 +00002537See also "U-Boot Porting Guide" below.
wdenkc6097192002-11-03 00:24:07 +00002538
wdenkc6097192002-11-03 00:24:07 +00002539
wdenk2729af92004-05-03 20:45:30 +00002540Monitor Commands - Overview:
2541============================
wdenkc6097192002-11-03 00:24:07 +00002542
wdenk2729af92004-05-03 20:45:30 +00002543go - start application at address 'addr'
2544run - run commands in an environment variable
2545bootm - boot application image from memory
2546bootp - boot image via network using BootP/TFTP protocol
2547tftpboot- boot image via network using TFTP protocol
2548 and env variables "ipaddr" and "serverip"
2549 (and eventually "gatewayip")
2550rarpboot- boot image via network using RARP/TFTP protocol
2551diskboot- boot from IDE devicebootd - boot default, i.e., run 'bootcmd'
2552loads - load S-Record file over serial line
2553loadb - load binary file over serial line (kermit mode)
2554md - memory display
2555mm - memory modify (auto-incrementing)
2556nm - memory modify (constant address)
2557mw - memory write (fill)
2558cp - memory copy
2559cmp - memory compare
2560crc32 - checksum calculation
2561imd - i2c memory display
2562imm - i2c memory modify (auto-incrementing)
2563inm - i2c memory modify (constant address)
2564imw - i2c memory write (fill)
2565icrc32 - i2c checksum calculation
2566iprobe - probe to discover valid I2C chip addresses
2567iloop - infinite loop on address range
2568isdram - print SDRAM configuration information
2569sspi - SPI utility commands
2570base - print or set address offset
2571printenv- print environment variables
2572setenv - set environment variables
2573saveenv - save environment variables to persistent storage
2574protect - enable or disable FLASH write protection
2575erase - erase FLASH memory
2576flinfo - print FLASH memory information
2577bdinfo - print Board Info structure
2578iminfo - print header information for application image
2579coninfo - print console devices and informations
2580ide - IDE sub-system
2581loop - infinite loop on address range
wdenk56523f12004-07-11 17:40:54 +00002582loopw - infinite write loop on address range
wdenk2729af92004-05-03 20:45:30 +00002583mtest - simple RAM test
2584icache - enable or disable instruction cache
2585dcache - enable or disable data cache
2586reset - Perform RESET of the CPU
2587echo - echo args to console
2588version - print monitor version
2589help - print online help
2590? - alias for 'help'
wdenkc6097192002-11-03 00:24:07 +00002591
wdenkc6097192002-11-03 00:24:07 +00002592
wdenk2729af92004-05-03 20:45:30 +00002593Monitor Commands - Detailed Description:
2594========================================
wdenkc6097192002-11-03 00:24:07 +00002595
wdenk2729af92004-05-03 20:45:30 +00002596TODO.
wdenkc6097192002-11-03 00:24:07 +00002597
wdenk2729af92004-05-03 20:45:30 +00002598For now: just type "help <command>".
wdenkc6097192002-11-03 00:24:07 +00002599
2600
wdenk2729af92004-05-03 20:45:30 +00002601Environment Variables:
2602======================
wdenkc6097192002-11-03 00:24:07 +00002603
wdenk2729af92004-05-03 20:45:30 +00002604U-Boot supports user configuration using Environment Variables which
2605can be made persistent by saving to Flash memory.
wdenkc6097192002-11-03 00:24:07 +00002606
wdenk2729af92004-05-03 20:45:30 +00002607Environment Variables are set using "setenv", printed using
2608"printenv", and saved to Flash using "saveenv". Using "setenv"
2609without a value can be used to delete a variable from the
2610environment. As long as you don't save the environment you are
2611working with an in-memory copy. In case the Flash area containing the
2612environment is erased by accident, a default environment is provided.
wdenkc6097192002-11-03 00:24:07 +00002613
wdenk2729af92004-05-03 20:45:30 +00002614Some configuration options can be set using Environment Variables:
wdenkc6097192002-11-03 00:24:07 +00002615
wdenk2729af92004-05-03 20:45:30 +00002616 baudrate - see CONFIG_BAUDRATE
wdenkc6097192002-11-03 00:24:07 +00002617
wdenk2729af92004-05-03 20:45:30 +00002618 bootdelay - see CONFIG_BOOTDELAY
wdenkc6097192002-11-03 00:24:07 +00002619
wdenk2729af92004-05-03 20:45:30 +00002620 bootcmd - see CONFIG_BOOTCOMMAND
wdenkc6097192002-11-03 00:24:07 +00002621
wdenk2729af92004-05-03 20:45:30 +00002622 bootargs - Boot arguments when booting an RTOS image
wdenkc6097192002-11-03 00:24:07 +00002623
wdenk2729af92004-05-03 20:45:30 +00002624 bootfile - Name of the image to load with TFTP
wdenkc6097192002-11-03 00:24:07 +00002625
wdenk2729af92004-05-03 20:45:30 +00002626 autoload - if set to "no" (any string beginning with 'n'),
2627 "bootp" will just load perform a lookup of the
2628 configuration from the BOOTP server, but not try to
2629 load any image using TFTP
wdenkc6097192002-11-03 00:24:07 +00002630
wdenk2729af92004-05-03 20:45:30 +00002631 autostart - if set to "yes", an image loaded using the "bootp",
2632 "rarpboot", "tftpboot" or "diskboot" commands will
2633 be automatically started (by internally calling
2634 "bootm")
wdenkc6097192002-11-03 00:24:07 +00002635
wdenk2729af92004-05-03 20:45:30 +00002636 If set to "no", a standalone image passed to the
2637 "bootm" command will be copied to the load address
2638 (and eventually uncompressed), but NOT be started.
2639 This can be used to load and uncompress arbitrary
2640 data.
wdenkc6097192002-11-03 00:24:07 +00002641
wdenk17ea1172004-06-06 21:51:03 +00002642 i2cfast - (PPC405GP|PPC405EP only)
2643 if set to 'y' configures Linux I2C driver for fast
2644 mode (400kHZ). This environment variable is used in
2645 initialization code. So, for changes to be effective
2646 it must be saved and board must be reset.
2647
wdenk2729af92004-05-03 20:45:30 +00002648 initrd_high - restrict positioning of initrd images:
2649 If this variable is not set, initrd images will be
2650 copied to the highest possible address in RAM; this
2651 is usually what you want since it allows for
2652 maximum initrd size. If for some reason you want to
2653 make sure that the initrd image is loaded below the
2654 CFG_BOOTMAPSZ limit, you can set this environment
2655 variable to a value of "no" or "off" or "0".
2656 Alternatively, you can set it to a maximum upper
2657 address to use (U-Boot will still check that it
2658 does not overwrite the U-Boot stack and data).
wdenkc6097192002-11-03 00:24:07 +00002659
wdenk2729af92004-05-03 20:45:30 +00002660 For instance, when you have a system with 16 MB
2661 RAM, and want to reserve 4 MB from use by Linux,
2662 you can do this by adding "mem=12M" to the value of
2663 the "bootargs" variable. However, now you must make
2664 sure that the initrd image is placed in the first
2665 12 MB as well - this can be done with
wdenkc6097192002-11-03 00:24:07 +00002666
wdenk2729af92004-05-03 20:45:30 +00002667 setenv initrd_high 00c00000
wdenkc6097192002-11-03 00:24:07 +00002668
wdenk2729af92004-05-03 20:45:30 +00002669 If you set initrd_high to 0xFFFFFFFF, this is an
2670 indication to U-Boot that all addresses are legal
2671 for the Linux kernel, including addresses in flash
2672 memory. In this case U-Boot will NOT COPY the
2673 ramdisk at all. This may be useful to reduce the
2674 boot time on your system, but requires that this
2675 feature is supported by your Linux kernel.
wdenk4a6fd342003-04-12 23:38:12 +00002676
wdenk2729af92004-05-03 20:45:30 +00002677 ipaddr - IP address; needed for tftpboot command
wdenkc6097192002-11-03 00:24:07 +00002678
wdenk2729af92004-05-03 20:45:30 +00002679 loadaddr - Default load address for commands like "bootp",
2680 "rarpboot", "tftpboot", "loadb" or "diskboot"
wdenkc6097192002-11-03 00:24:07 +00002681
wdenk2729af92004-05-03 20:45:30 +00002682 loads_echo - see CONFIG_LOADS_ECHO
wdenkc6097192002-11-03 00:24:07 +00002683
wdenk2729af92004-05-03 20:45:30 +00002684 serverip - TFTP server IP address; needed for tftpboot command
wdenk38b99262003-05-23 23:18:21 +00002685
wdenk2729af92004-05-03 20:45:30 +00002686 bootretry - see CONFIG_BOOT_RETRY_TIME
wdenkc6097192002-11-03 00:24:07 +00002687
wdenk2729af92004-05-03 20:45:30 +00002688 bootdelaykey - see CONFIG_AUTOBOOT_DELAY_STR
wdenkc6097192002-11-03 00:24:07 +00002689
wdenk2729af92004-05-03 20:45:30 +00002690 bootstopkey - see CONFIG_AUTOBOOT_STOP_STR
wdenkc6097192002-11-03 00:24:07 +00002691
wdenk2729af92004-05-03 20:45:30 +00002692 ethprime - When CONFIG_NET_MULTI is enabled controls which
2693 interface is used first.
wdenkc6097192002-11-03 00:24:07 +00002694
wdenk2729af92004-05-03 20:45:30 +00002695 ethact - When CONFIG_NET_MULTI is enabled controls which
2696 interface is currently active. For example you
2697 can do the following
wdenkc6097192002-11-03 00:24:07 +00002698
wdenk2729af92004-05-03 20:45:30 +00002699 => setenv ethact FEC ETHERNET
2700 => ping 192.168.0.1 # traffic sent on FEC ETHERNET
2701 => setenv ethact SCC ETHERNET
2702 => ping 10.0.0.1 # traffic sent on SCC ETHERNET
wdenkc6097192002-11-03 00:24:07 +00002703
Matthias Fuchse1692572008-01-17 07:45:05 +01002704 ethrotate - When set to "no" U-Boot does not go through all
2705 available network interfaces.
2706 It just stays at the currently selected interface.
2707
wdenk2729af92004-05-03 20:45:30 +00002708 netretry - When set to "no" each network operation will
2709 either succeed or fail without retrying.
2710 When set to "once" the network operation will
2711 fail when all the available network interfaces
2712 are tried once without success.
2713 Useful on scripts which control the retry operation
2714 themselves.
wdenkc6097192002-11-03 00:24:07 +00002715
Jean-Christophe PLAGNIOL-VILLARDa1cf0272008-01-07 08:41:34 +01002716 npe_ucode - see CONFIG_IXP4XX_NPE_EXT_UCOD
2717 if set load address for the npe microcode
2718
Wolfgang Denk28cb9372005-09-24 23:25:46 +02002719 tftpsrcport - If this is set, the value is used for TFTP's
Wolfgang Denkecb0ccd2005-09-24 22:37:32 +02002720 UDP source port.
2721
Wolfgang Denk28cb9372005-09-24 23:25:46 +02002722 tftpdstport - If this is set, the value is used for TFTP's UDP
2723 destination port instead of the Well Know Port 69.
2724
wdenk2729af92004-05-03 20:45:30 +00002725 vlan - When set to a value < 4095 the traffic over
2726 ethernet is encapsulated/received over 802.1q
2727 VLAN tagged frames.
wdenka3d991b2004-04-15 21:48:45 +00002728
wdenk2729af92004-05-03 20:45:30 +00002729The following environment variables may be used and automatically
2730updated by the network boot commands ("bootp" and "rarpboot"),
2731depending the information provided by your boot server:
wdenka3d991b2004-04-15 21:48:45 +00002732
wdenk2729af92004-05-03 20:45:30 +00002733 bootfile - see above
2734 dnsip - IP address of your Domain Name Server
2735 dnsip2 - IP address of your secondary Domain Name Server
2736 gatewayip - IP address of the Gateway (Router) to use
2737 hostname - Target hostname
2738 ipaddr - see above
2739 netmask - Subnet Mask
2740 rootpath - Pathname of the root filesystem on the NFS server
2741 serverip - see above
wdenka3d991b2004-04-15 21:48:45 +00002742
wdenka3d991b2004-04-15 21:48:45 +00002743
wdenk2729af92004-05-03 20:45:30 +00002744There are two special Environment Variables:
wdenkc6097192002-11-03 00:24:07 +00002745
wdenk2729af92004-05-03 20:45:30 +00002746 serial# - contains hardware identification information such
2747 as type string and/or serial number
2748 ethaddr - Ethernet address
wdenkc6097192002-11-03 00:24:07 +00002749
wdenk2729af92004-05-03 20:45:30 +00002750These variables can be set only once (usually during manufacturing of
2751the board). U-Boot refuses to delete or overwrite these variables
2752once they have been set once.
wdenkc6097192002-11-03 00:24:07 +00002753
2754
wdenk2729af92004-05-03 20:45:30 +00002755Further special Environment Variables:
wdenkc6097192002-11-03 00:24:07 +00002756
wdenk2729af92004-05-03 20:45:30 +00002757 ver - Contains the U-Boot version string as printed
2758 with the "version" command. This variable is
2759 readonly (see CONFIG_VERSION_VARIABLE).
wdenkc6097192002-11-03 00:24:07 +00002760
wdenkc6097192002-11-03 00:24:07 +00002761
wdenk2729af92004-05-03 20:45:30 +00002762Please note that changes to some configuration parameters may take
2763only effect after the next boot (yes, that's just like Windoze :-).
wdenkc6097192002-11-03 00:24:07 +00002764
stroesec1551ea2003-04-04 15:53:41 +00002765
wdenk2729af92004-05-03 20:45:30 +00002766Command Line Parsing:
2767=====================
stroesec1551ea2003-04-04 15:53:41 +00002768
wdenk2729af92004-05-03 20:45:30 +00002769There are two different command line parsers available with U-Boot:
2770the old "simple" one, and the much more powerful "hush" shell:
stroesec1551ea2003-04-04 15:53:41 +00002771
wdenk2729af92004-05-03 20:45:30 +00002772Old, simple command line parser:
2773--------------------------------
wdenkc6097192002-11-03 00:24:07 +00002774
wdenk2729af92004-05-03 20:45:30 +00002775- supports environment variables (through setenv / saveenv commands)
2776- several commands on one line, separated by ';'
Wolfgang Denkfe126d82005-11-20 21:40:11 +01002777- variable substitution using "... ${name} ..." syntax
wdenk2729af92004-05-03 20:45:30 +00002778- special characters ('$', ';') can be escaped by prefixing with '\',
2779 for example:
Wolfgang Denkfe126d82005-11-20 21:40:11 +01002780 setenv bootcmd bootm \${address}
wdenk2729af92004-05-03 20:45:30 +00002781- You can also escape text by enclosing in single apostrophes, for example:
2782 setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off'
wdenkc6097192002-11-03 00:24:07 +00002783
wdenk2729af92004-05-03 20:45:30 +00002784Hush shell:
2785-----------
wdenkf07771c2003-05-28 08:06:31 +00002786
wdenk2729af92004-05-03 20:45:30 +00002787- similar to Bourne shell, with control structures like
2788 if...then...else...fi, for...do...done; while...do...done,
2789 until...do...done, ...
2790- supports environment ("global") variables (through setenv / saveenv
2791 commands) and local shell variables (through standard shell syntax
2792 "name=value"); only environment variables can be used with "run"
2793 command
wdenkf07771c2003-05-28 08:06:31 +00002794
wdenk2729af92004-05-03 20:45:30 +00002795General rules:
2796--------------
wdenkf07771c2003-05-28 08:06:31 +00002797
wdenk2729af92004-05-03 20:45:30 +00002798(1) If a command line (or an environment variable executed by a "run"
2799 command) contains several commands separated by semicolon, and
2800 one of these commands fails, then the remaining commands will be
2801 executed anyway.
wdenkf07771c2003-05-28 08:06:31 +00002802
wdenk2729af92004-05-03 20:45:30 +00002803(2) If you execute several variables with one call to run (i. e.
2804 calling run with a list af variables as arguments), any failing
2805 command will cause "run" to terminate, i. e. the remaining
2806 variables are not executed.
wdenkf07771c2003-05-28 08:06:31 +00002807
wdenk2729af92004-05-03 20:45:30 +00002808Note for Redundant Ethernet Interfaces:
2809=======================================
wdenkf07771c2003-05-28 08:06:31 +00002810
wdenk2729af92004-05-03 20:45:30 +00002811Some boards come with redundant ethernet interfaces; U-Boot supports
2812such configurations and is capable of automatic selection of a
2813"working" interface when needed. MAC assignment works as follows:
wdenkf07771c2003-05-28 08:06:31 +00002814
wdenk2729af92004-05-03 20:45:30 +00002815Network interfaces are numbered eth0, eth1, eth2, ... Corresponding
2816MAC addresses can be stored in the environment as "ethaddr" (=>eth0),
2817"eth1addr" (=>eth1), "eth2addr", ...
wdenkf07771c2003-05-28 08:06:31 +00002818
wdenk2729af92004-05-03 20:45:30 +00002819If the network interface stores some valid MAC address (for instance
2820in SROM), this is used as default address if there is NO correspon-
2821ding setting in the environment; if the corresponding environment
2822variable is set, this overrides the settings in the card; that means:
wdenkf07771c2003-05-28 08:06:31 +00002823
wdenk2729af92004-05-03 20:45:30 +00002824o If the SROM has a valid MAC address, and there is no address in the
2825 environment, the SROM's address is used.
wdenkc6097192002-11-03 00:24:07 +00002826
wdenk2729af92004-05-03 20:45:30 +00002827o If there is no valid address in the SROM, and a definition in the
2828 environment exists, then the value from the environment variable is
2829 used.
wdenkc6097192002-11-03 00:24:07 +00002830
wdenk2729af92004-05-03 20:45:30 +00002831o If both the SROM and the environment contain a MAC address, and
2832 both addresses are the same, this MAC address is used.
wdenkc6097192002-11-03 00:24:07 +00002833
wdenk2729af92004-05-03 20:45:30 +00002834o If both the SROM and the environment contain a MAC address, and the
2835 addresses differ, the value from the environment is used and a
2836 warning is printed.
wdenkc6097192002-11-03 00:24:07 +00002837
wdenk2729af92004-05-03 20:45:30 +00002838o If neither SROM nor the environment contain a MAC address, an error
2839 is raised.
wdenkc6097192002-11-03 00:24:07 +00002840
wdenkc6097192002-11-03 00:24:07 +00002841
wdenk2729af92004-05-03 20:45:30 +00002842Image Formats:
2843==============
wdenkc6097192002-11-03 00:24:07 +00002844
wdenk2729af92004-05-03 20:45:30 +00002845The "boot" commands of this monitor operate on "image" files which
2846can be basicly anything, preceeded by a special header; see the
2847definitions in include/image.h for details; basicly, the header
2848defines the following image properties:
wdenkc6097192002-11-03 00:24:07 +00002849
wdenk2729af92004-05-03 20:45:30 +00002850* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD,
2851 4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks,
2852 LynxOS, pSOS, QNX, RTEMS, ARTOS;
2853 Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, ARTOS, LynxOS).
Wolfgang Denk7b64fef2006-10-24 14:21:16 +02002854* Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86,
wdenk2729af92004-05-03 20:45:30 +00002855 IA64, MIPS, NIOS, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit;
Wolfgang Denk7b64fef2006-10-24 14:21:16 +02002856 Currently supported: ARM, AVR32, Intel x86, MIPS, NIOS, PowerPC).
wdenk2729af92004-05-03 20:45:30 +00002857* Compression Type (uncompressed, gzip, bzip2)
2858* Load Address
2859* Entry Point
2860* Image Name
2861* Image Timestamp
wdenkc6097192002-11-03 00:24:07 +00002862
wdenk2729af92004-05-03 20:45:30 +00002863The header is marked by a special Magic Number, and both the header
2864and the data portions of the image are secured against corruption by
2865CRC32 checksums.
wdenkc6097192002-11-03 00:24:07 +00002866
wdenkc6097192002-11-03 00:24:07 +00002867
wdenk2729af92004-05-03 20:45:30 +00002868Linux Support:
2869==============
wdenkc6097192002-11-03 00:24:07 +00002870
wdenk2729af92004-05-03 20:45:30 +00002871Although U-Boot should support any OS or standalone application
2872easily, the main focus has always been on Linux during the design of
2873U-Boot.
wdenkc6097192002-11-03 00:24:07 +00002874
wdenk2729af92004-05-03 20:45:30 +00002875U-Boot includes many features that so far have been part of some
2876special "boot loader" code within the Linux kernel. Also, any
2877"initrd" images to be used are no longer part of one big Linux image;
2878instead, kernel and "initrd" are separate images. This implementation
2879serves several purposes:
wdenkc6097192002-11-03 00:24:07 +00002880
wdenk2729af92004-05-03 20:45:30 +00002881- the same features can be used for other OS or standalone
2882 applications (for instance: using compressed images to reduce the
2883 Flash memory footprint)
wdenkc6097192002-11-03 00:24:07 +00002884
wdenk2729af92004-05-03 20:45:30 +00002885- it becomes much easier to port new Linux kernel versions because
2886 lots of low-level, hardware dependent stuff are done by U-Boot
wdenkc6097192002-11-03 00:24:07 +00002887
wdenk2729af92004-05-03 20:45:30 +00002888- the same Linux kernel image can now be used with different "initrd"
2889 images; of course this also means that different kernel images can
2890 be run with the same "initrd". This makes testing easier (you don't
2891 have to build a new "zImage.initrd" Linux image when you just
2892 change a file in your "initrd"). Also, a field-upgrade of the
2893 software is easier now.
wdenkc6097192002-11-03 00:24:07 +00002894
wdenkc6097192002-11-03 00:24:07 +00002895
wdenk2729af92004-05-03 20:45:30 +00002896Linux HOWTO:
2897============
wdenkc6097192002-11-03 00:24:07 +00002898
wdenk2729af92004-05-03 20:45:30 +00002899Porting Linux to U-Boot based systems:
2900---------------------------------------
wdenkc6097192002-11-03 00:24:07 +00002901
wdenk2729af92004-05-03 20:45:30 +00002902U-Boot cannot save you from doing all the necessary modifications to
2903configure the Linux device drivers for use with your target hardware
2904(no, we don't intend to provide a full virtual machine interface to
2905Linux :-).
wdenkc6097192002-11-03 00:24:07 +00002906
wdenk2729af92004-05-03 20:45:30 +00002907But now you can ignore ALL boot loader code (in arch/ppc/mbxboot).
wdenkc6097192002-11-03 00:24:07 +00002908
wdenk2729af92004-05-03 20:45:30 +00002909Just make sure your machine specific header file (for instance
2910include/asm-ppc/tqm8xx.h) includes the same definition of the Board
2911Information structure as we define in include/u-boot.h, and make
2912sure that your definition of IMAP_ADDR uses the same value as your
2913U-Boot configuration in CFG_IMMR.
wdenkc6097192002-11-03 00:24:07 +00002914
wdenkc6097192002-11-03 00:24:07 +00002915
wdenk2729af92004-05-03 20:45:30 +00002916Configuring the Linux kernel:
2917-----------------------------
wdenkc6097192002-11-03 00:24:07 +00002918
wdenk2729af92004-05-03 20:45:30 +00002919No specific requirements for U-Boot. Make sure you have some root
2920device (initial ramdisk, NFS) for your target system.
wdenkc6097192002-11-03 00:24:07 +00002921
wdenkc6097192002-11-03 00:24:07 +00002922
wdenk2729af92004-05-03 20:45:30 +00002923Building a Linux Image:
2924-----------------------
wdenkc6097192002-11-03 00:24:07 +00002925
wdenk2729af92004-05-03 20:45:30 +00002926With U-Boot, "normal" build targets like "zImage" or "bzImage" are
2927not used. If you use recent kernel source, a new build target
2928"uImage" will exist which automatically builds an image usable by
2929U-Boot. Most older kernels also have support for a "pImage" target,
2930which was introduced for our predecessor project PPCBoot and uses a
2931100% compatible format.
wdenkc6097192002-11-03 00:24:07 +00002932
wdenk2729af92004-05-03 20:45:30 +00002933Example:
wdenkc6097192002-11-03 00:24:07 +00002934
wdenk2729af92004-05-03 20:45:30 +00002935 make TQM850L_config
2936 make oldconfig
2937 make dep
2938 make uImage
wdenkc6097192002-11-03 00:24:07 +00002939
wdenk2729af92004-05-03 20:45:30 +00002940The "uImage" build target uses a special tool (in 'tools/mkimage') to
2941encapsulate a compressed Linux kernel image with header information,
2942CRC32 checksum etc. for use with U-Boot. This is what we are doing:
wdenkc6097192002-11-03 00:24:07 +00002943
wdenk2729af92004-05-03 20:45:30 +00002944* build a standard "vmlinux" kernel image (in ELF binary format):
wdenkc6097192002-11-03 00:24:07 +00002945
wdenk2729af92004-05-03 20:45:30 +00002946* convert the kernel into a raw binary image:
wdenkc6097192002-11-03 00:24:07 +00002947
wdenk2729af92004-05-03 20:45:30 +00002948 ${CROSS_COMPILE}-objcopy -O binary \
2949 -R .note -R .comment \
2950 -S vmlinux linux.bin
wdenkc6097192002-11-03 00:24:07 +00002951
wdenk2729af92004-05-03 20:45:30 +00002952* compress the binary image:
wdenkc6097192002-11-03 00:24:07 +00002953
wdenk2729af92004-05-03 20:45:30 +00002954 gzip -9 linux.bin
wdenkc6097192002-11-03 00:24:07 +00002955
wdenk2729af92004-05-03 20:45:30 +00002956* package compressed binary image for U-Boot:
wdenk24ee89b2002-11-03 17:56:27 +00002957
wdenk2729af92004-05-03 20:45:30 +00002958 mkimage -A ppc -O linux -T kernel -C gzip \
2959 -a 0 -e 0 -n "Linux Kernel Image" \
2960 -d linux.bin.gz uImage
wdenk24ee89b2002-11-03 17:56:27 +00002961
wdenk24ee89b2002-11-03 17:56:27 +00002962
wdenk2729af92004-05-03 20:45:30 +00002963The "mkimage" tool can also be used to create ramdisk images for use
2964with U-Boot, either separated from the Linux kernel image, or
2965combined into one file. "mkimage" encapsulates the images with a 64
2966byte header containing information about target architecture,
2967operating system, image type, compression method, entry points, time
2968stamp, CRC32 checksums, etc.
wdenk24ee89b2002-11-03 17:56:27 +00002969
wdenk2729af92004-05-03 20:45:30 +00002970"mkimage" can be called in two ways: to verify existing images and
2971print the header information, or to build new images.
wdenk24ee89b2002-11-03 17:56:27 +00002972
wdenk2729af92004-05-03 20:45:30 +00002973In the first form (with "-l" option) mkimage lists the information
2974contained in the header of an existing U-Boot image; this includes
2975checksum verification:
wdenk24ee89b2002-11-03 17:56:27 +00002976
wdenk2729af92004-05-03 20:45:30 +00002977 tools/mkimage -l image
2978 -l ==> list image header information
wdenk24ee89b2002-11-03 17:56:27 +00002979
wdenk2729af92004-05-03 20:45:30 +00002980The second form (with "-d" option) is used to build a U-Boot image
2981from a "data file" which is used as image payload:
wdenk24ee89b2002-11-03 17:56:27 +00002982
wdenk2729af92004-05-03 20:45:30 +00002983 tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \
2984 -n name -d data_file image
2985 -A ==> set architecture to 'arch'
2986 -O ==> set operating system to 'os'
2987 -T ==> set image type to 'type'
2988 -C ==> set compression type 'comp'
2989 -a ==> set load address to 'addr' (hex)
2990 -e ==> set entry point to 'ep' (hex)
2991 -n ==> set image name to 'name'
2992 -d ==> use image data from 'datafile'
wdenk24ee89b2002-11-03 17:56:27 +00002993
wdenk69459792004-05-29 16:53:29 +00002994Right now, all Linux kernels for PowerPC systems use the same load
2995address (0x00000000), but the entry point address depends on the
2996kernel version:
wdenkc6097192002-11-03 00:24:07 +00002997
wdenk2729af92004-05-03 20:45:30 +00002998- 2.2.x kernels have the entry point at 0x0000000C,
2999- 2.3.x and later kernels have the entry point at 0x00000000.
wdenkc6097192002-11-03 00:24:07 +00003000
wdenk2729af92004-05-03 20:45:30 +00003001So a typical call to build a U-Boot image would read:
wdenkc6097192002-11-03 00:24:07 +00003002
wdenk2729af92004-05-03 20:45:30 +00003003 -> tools/mkimage -n '2.4.4 kernel for TQM850L' \
3004 > -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \
3005 > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux.gz \
3006 > examples/uImage.TQM850L
3007 Image Name: 2.4.4 kernel for TQM850L
3008 Created: Wed Jul 19 02:34:59 2000
3009 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3010 Data Size: 335725 Bytes = 327.86 kB = 0.32 MB
3011 Load Address: 0x00000000
3012 Entry Point: 0x00000000
wdenkc6097192002-11-03 00:24:07 +00003013
wdenk2729af92004-05-03 20:45:30 +00003014To verify the contents of the image (or check for corruption):
wdenkc6097192002-11-03 00:24:07 +00003015
wdenk2729af92004-05-03 20:45:30 +00003016 -> tools/mkimage -l examples/uImage.TQM850L
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 (gzip compressed)
3020 Data Size: 335725 Bytes = 327.86 kB = 0.32 MB
3021 Load Address: 0x00000000
3022 Entry Point: 0x00000000
wdenkc6097192002-11-03 00:24:07 +00003023
wdenk2729af92004-05-03 20:45:30 +00003024NOTE: for embedded systems where boot time is critical you can trade
3025speed for memory and install an UNCOMPRESSED image instead: this
3026needs more space in Flash, but boots much faster since it does not
3027need to be uncompressed:
wdenkc6097192002-11-03 00:24:07 +00003028
wdenk2729af92004-05-03 20:45:30 +00003029 -> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux.gz
3030 -> tools/mkimage -n '2.4.4 kernel for TQM850L' \
3031 > -A ppc -O linux -T kernel -C none -a 0 -e 0 \
3032 > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux \
3033 > examples/uImage.TQM850L-uncompressed
3034 Image Name: 2.4.4 kernel for TQM850L
3035 Created: Wed Jul 19 02:34:59 2000
3036 Image Type: PowerPC Linux Kernel Image (uncompressed)
3037 Data Size: 792160 Bytes = 773.59 kB = 0.76 MB
3038 Load Address: 0x00000000
3039 Entry Point: 0x00000000
wdenkc6097192002-11-03 00:24:07 +00003040
wdenkc6097192002-11-03 00:24:07 +00003041
wdenk2729af92004-05-03 20:45:30 +00003042Similar you can build U-Boot images from a 'ramdisk.image.gz' file
3043when your kernel is intended to use an initial ramdisk:
wdenkdb01a2e2004-04-15 23:14:49 +00003044
wdenk2729af92004-05-03 20:45:30 +00003045 -> tools/mkimage -n 'Simple Ramdisk Image' \
3046 > -A ppc -O linux -T ramdisk -C gzip \
3047 > -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd
3048 Image Name: Simple Ramdisk Image
3049 Created: Wed Jan 12 14:01:50 2000
3050 Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
3051 Data Size: 566530 Bytes = 553.25 kB = 0.54 MB
3052 Load Address: 0x00000000
3053 Entry Point: 0x00000000
wdenkdb01a2e2004-04-15 23:14:49 +00003054
wdenkdb01a2e2004-04-15 23:14:49 +00003055
wdenk2729af92004-05-03 20:45:30 +00003056Installing a Linux Image:
3057-------------------------
wdenkdb01a2e2004-04-15 23:14:49 +00003058
wdenk2729af92004-05-03 20:45:30 +00003059To downloading a U-Boot image over the serial (console) interface,
3060you must convert the image to S-Record format:
wdenkdb01a2e2004-04-15 23:14:49 +00003061
wdenk2729af92004-05-03 20:45:30 +00003062 objcopy -I binary -O srec examples/image examples/image.srec
wdenkdb01a2e2004-04-15 23:14:49 +00003063
wdenk2729af92004-05-03 20:45:30 +00003064The 'objcopy' does not understand the information in the U-Boot
3065image header, so the resulting S-Record file will be relative to
3066address 0x00000000. To load it to a given address, you need to
3067specify the target address as 'offset' parameter with the 'loads'
3068command.
wdenkc6097192002-11-03 00:24:07 +00003069
wdenk2729af92004-05-03 20:45:30 +00003070Example: install the image to address 0x40100000 (which on the
3071TQM8xxL is in the first Flash bank):
wdenkc6097192002-11-03 00:24:07 +00003072
wdenk2729af92004-05-03 20:45:30 +00003073 => erase 40100000 401FFFFF
wdenkc6097192002-11-03 00:24:07 +00003074
wdenk2729af92004-05-03 20:45:30 +00003075 .......... done
3076 Erased 8 sectors
wdenkc6097192002-11-03 00:24:07 +00003077
wdenk2729af92004-05-03 20:45:30 +00003078 => loads 40100000
3079 ## Ready for S-Record download ...
3080 ~>examples/image.srec
3081 1 2 3 4 5 6 7 8 9 10 11 12 13 ...
3082 ...
3083 15989 15990 15991 15992
3084 [file transfer complete]
3085 [connected]
3086 ## Start Addr = 0x00000000
wdenkc6097192002-11-03 00:24:07 +00003087
3088
wdenk2729af92004-05-03 20:45:30 +00003089You can check the success of the download using the 'iminfo' command;
3090this includes a checksum verification so you can be sure no data
3091corruption happened:
wdenkc6097192002-11-03 00:24:07 +00003092
wdenk2729af92004-05-03 20:45:30 +00003093 => imi 40100000
wdenkc6097192002-11-03 00:24:07 +00003094
wdenk2729af92004-05-03 20:45:30 +00003095 ## Checking Image at 40100000 ...
3096 Image Name: 2.2.13 for initrd on TQM850L
3097 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3098 Data Size: 335725 Bytes = 327 kB = 0 MB
3099 Load Address: 00000000
3100 Entry Point: 0000000c
3101 Verifying Checksum ... OK
wdenkc6097192002-11-03 00:24:07 +00003102
3103
wdenk2729af92004-05-03 20:45:30 +00003104Boot Linux:
3105-----------
wdenkc6097192002-11-03 00:24:07 +00003106
wdenk2729af92004-05-03 20:45:30 +00003107The "bootm" command is used to boot an application that is stored in
3108memory (RAM or Flash). In case of a Linux kernel image, the contents
3109of the "bootargs" environment variable is passed to the kernel as
3110parameters. You can check and modify this variable using the
3111"printenv" and "setenv" commands:
wdenkc6097192002-11-03 00:24:07 +00003112
3113
wdenk2729af92004-05-03 20:45:30 +00003114 => printenv bootargs
3115 bootargs=root=/dev/ram
wdenkc6097192002-11-03 00:24:07 +00003116
wdenk2729af92004-05-03 20:45:30 +00003117 => 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 +00003118
wdenk2729af92004-05-03 20:45:30 +00003119 => printenv bootargs
3120 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 +00003121
wdenk2729af92004-05-03 20:45:30 +00003122 => bootm 40020000
3123 ## Booting Linux kernel at 40020000 ...
3124 Image Name: 2.2.13 for NFS on TQM850L
3125 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3126 Data Size: 381681 Bytes = 372 kB = 0 MB
3127 Load Address: 00000000
3128 Entry Point: 0000000c
3129 Verifying Checksum ... OK
3130 Uncompressing Kernel Image ... OK
3131 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
3132 Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
3133 time_init: decrementer frequency = 187500000/60
3134 Calibrating delay loop... 49.77 BogoMIPS
3135 Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000]
3136 ...
wdenkc6097192002-11-03 00:24:07 +00003137
wdenk2729af92004-05-03 20:45:30 +00003138If you want to boot a Linux kernel with initial ram disk, you pass
3139the memory addresses of both the kernel and the initrd image (PPBCOOT
3140format!) to the "bootm" command:
wdenkc6097192002-11-03 00:24:07 +00003141
wdenk2729af92004-05-03 20:45:30 +00003142 => imi 40100000 40200000
wdenkc6097192002-11-03 00:24:07 +00003143
wdenk2729af92004-05-03 20:45:30 +00003144 ## Checking Image 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
wdenkc6097192002-11-03 00:24:07 +00003151
wdenk2729af92004-05-03 20:45:30 +00003152 ## Checking 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
wdenkc6097192002-11-03 00:24:07 +00003159
wdenk2729af92004-05-03 20:45:30 +00003160 => bootm 40100000 40200000
3161 ## Booting Linux kernel at 40100000 ...
3162 Image Name: 2.2.13 for initrd on TQM850L
3163 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3164 Data Size: 335725 Bytes = 327 kB = 0 MB
3165 Load Address: 00000000
3166 Entry Point: 0000000c
3167 Verifying Checksum ... OK
3168 Uncompressing Kernel Image ... OK
3169 ## Loading RAMDisk Image at 40200000 ...
3170 Image Name: Simple Ramdisk Image
3171 Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
3172 Data Size: 566530 Bytes = 553 kB = 0 MB
3173 Load Address: 00000000
3174 Entry Point: 00000000
3175 Verifying Checksum ... OK
3176 Loading Ramdisk ... OK
3177 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
3178 Boot arguments: root=/dev/ram
3179 time_init: decrementer frequency = 187500000/60
3180 Calibrating delay loop... 49.77 BogoMIPS
3181 ...
3182 RAMDISK: Compressed image found at block 0
3183 VFS: Mounted root (ext2 filesystem).
wdenkc6097192002-11-03 00:24:07 +00003184
wdenk2729af92004-05-03 20:45:30 +00003185 bash#
wdenkc6097192002-11-03 00:24:07 +00003186
Matthew McClintock02677682006-06-28 10:41:37 -05003187Boot Linux and pass a flat device tree:
3188-----------
3189
3190First, U-Boot must be compiled with the appropriate defines. See the section
3191titled "Linux Kernel Interface" above for a more in depth explanation. The
3192following is an example of how to start a kernel and pass an updated
3193flat device tree:
3194
3195=> print oftaddr
3196oftaddr=0x300000
3197=> print oft
3198oft=oftrees/mpc8540ads.dtb
3199=> tftp $oftaddr $oft
3200Speed: 1000, full duplex
3201Using TSEC0 device
3202TFTP from server 192.168.1.1; our IP address is 192.168.1.101
3203Filename 'oftrees/mpc8540ads.dtb'.
3204Load address: 0x300000
3205Loading: #
3206done
3207Bytes transferred = 4106 (100a hex)
3208=> tftp $loadaddr $bootfile
3209Speed: 1000, full duplex
3210Using TSEC0 device
3211TFTP from server 192.168.1.1; our IP address is 192.168.1.2
3212Filename 'uImage'.
3213Load address: 0x200000
3214Loading:############
3215done
3216Bytes transferred = 1029407 (fb51f hex)
3217=> print loadaddr
3218loadaddr=200000
3219=> print oftaddr
3220oftaddr=0x300000
3221=> bootm $loadaddr - $oftaddr
3222## Booting image at 00200000 ...
Wolfgang Denka9398e02006-11-27 15:32:42 +01003223 Image Name: Linux-2.6.17-dirty
3224 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3225 Data Size: 1029343 Bytes = 1005.2 kB
Matthew McClintock02677682006-06-28 10:41:37 -05003226 Load Address: 00000000
Wolfgang Denka9398e02006-11-27 15:32:42 +01003227 Entry Point: 00000000
Matthew McClintock02677682006-06-28 10:41:37 -05003228 Verifying Checksum ... OK
3229 Uncompressing Kernel Image ... OK
3230Booting using flat device tree at 0x300000
3231Using MPC85xx ADS machine description
3232Memory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb
3233[snip]
3234
3235
wdenk2729af92004-05-03 20:45:30 +00003236More About U-Boot Image Types:
3237------------------------------
wdenk6069ff22003-02-28 00:49:47 +00003238
wdenk2729af92004-05-03 20:45:30 +00003239U-Boot supports the following image types:
wdenk6069ff22003-02-28 00:49:47 +00003240
wdenk2729af92004-05-03 20:45:30 +00003241 "Standalone Programs" are directly runnable in the environment
3242 provided by U-Boot; it is expected that (if they behave
3243 well) you can continue to work in U-Boot after return from
3244 the Standalone Program.
3245 "OS Kernel Images" are usually images of some Embedded OS which
3246 will take over control completely. Usually these programs
3247 will install their own set of exception handlers, device
3248 drivers, set up the MMU, etc. - this means, that you cannot
3249 expect to re-enter U-Boot except by resetting the CPU.
3250 "RAMDisk Images" are more or less just data blocks, and their
3251 parameters (address, size) are passed to an OS kernel that is
3252 being started.
3253 "Multi-File Images" contain several images, typically an OS
3254 (Linux) kernel image and one or more data images like
3255 RAMDisks. This construct is useful for instance when you want
3256 to boot over the network using BOOTP etc., where the boot
3257 server provides just a single image file, but you want to get
3258 for instance an OS kernel and a RAMDisk image.
stroesec1551ea2003-04-04 15:53:41 +00003259
wdenk2729af92004-05-03 20:45:30 +00003260 "Multi-File Images" start with a list of image sizes, each
3261 image size (in bytes) specified by an "uint32_t" in network
3262 byte order. This list is terminated by an "(uint32_t)0".
3263 Immediately after the terminating 0 follow the images, one by
3264 one, all aligned on "uint32_t" boundaries (size rounded up to
3265 a multiple of 4 bytes).
stroesec1551ea2003-04-04 15:53:41 +00003266
wdenk2729af92004-05-03 20:45:30 +00003267 "Firmware Images" are binary images containing firmware (like
3268 U-Boot or FPGA images) which usually will be programmed to
3269 flash memory.
stroesec1551ea2003-04-04 15:53:41 +00003270
wdenk2729af92004-05-03 20:45:30 +00003271 "Script files" are command sequences that will be executed by
3272 U-Boot's command interpreter; this feature is especially
3273 useful when you configure U-Boot to use a real shell (hush)
3274 as command interpreter.
wdenk6069ff22003-02-28 00:49:47 +00003275
wdenkc6097192002-11-03 00:24:07 +00003276
wdenk2729af92004-05-03 20:45:30 +00003277Standalone HOWTO:
3278=================
wdenkc6097192002-11-03 00:24:07 +00003279
wdenk2729af92004-05-03 20:45:30 +00003280One of the features of U-Boot is that you can dynamically load and
3281run "standalone" applications, which can use some resources of
3282U-Boot like console I/O functions or interrupt services.
wdenkc6097192002-11-03 00:24:07 +00003283
wdenk2729af92004-05-03 20:45:30 +00003284Two simple examples are included with the sources:
wdenkc6097192002-11-03 00:24:07 +00003285
wdenk2729af92004-05-03 20:45:30 +00003286"Hello World" Demo:
3287-------------------
wdenkc6097192002-11-03 00:24:07 +00003288
wdenk2729af92004-05-03 20:45:30 +00003289'examples/hello_world.c' contains a small "Hello World" Demo
3290application; it is automatically compiled when you build U-Boot.
3291It's configured to run at address 0x00040004, so you can play with it
3292like that:
wdenkc6097192002-11-03 00:24:07 +00003293
wdenk2729af92004-05-03 20:45:30 +00003294 => loads
3295 ## Ready for S-Record download ...
3296 ~>examples/hello_world.srec
3297 1 2 3 4 5 6 7 8 9 10 11 ...
3298 [file transfer complete]
3299 [connected]
3300 ## Start Addr = 0x00040004
wdenkc6097192002-11-03 00:24:07 +00003301
wdenk2729af92004-05-03 20:45:30 +00003302 => go 40004 Hello World! This is a test.
3303 ## Starting application at 0x00040004 ...
3304 Hello World
3305 argc = 7
3306 argv[0] = "40004"
3307 argv[1] = "Hello"
3308 argv[2] = "World!"
3309 argv[3] = "This"
3310 argv[4] = "is"
3311 argv[5] = "a"
3312 argv[6] = "test."
3313 argv[7] = "<NULL>"
3314 Hit any key to exit ...
wdenkc6097192002-11-03 00:24:07 +00003315
wdenk2729af92004-05-03 20:45:30 +00003316 ## Application terminated, rc = 0x0
wdenkc6097192002-11-03 00:24:07 +00003317
wdenk2729af92004-05-03 20:45:30 +00003318Another example, which demonstrates how to register a CPM interrupt
3319handler with the U-Boot code, can be found in 'examples/timer.c'.
3320Here, a CPM timer is set up to generate an interrupt every second.
3321The interrupt service routine is trivial, just printing a '.'
3322character, but this is just a demo program. The application can be
3323controlled by the following keys:
wdenkc6097192002-11-03 00:24:07 +00003324
wdenk2729af92004-05-03 20:45:30 +00003325 ? - print current values og the CPM Timer registers
3326 b - enable interrupts and start timer
3327 e - stop timer and disable interrupts
3328 q - quit application
wdenkc6097192002-11-03 00:24:07 +00003329
wdenk2729af92004-05-03 20:45:30 +00003330 => loads
3331 ## Ready for S-Record download ...
3332 ~>examples/timer.srec
3333 1 2 3 4 5 6 7 8 9 10 11 ...
3334 [file transfer complete]
3335 [connected]
3336 ## Start Addr = 0x00040004
wdenkc6097192002-11-03 00:24:07 +00003337
wdenk2729af92004-05-03 20:45:30 +00003338 => go 40004
3339 ## Starting application at 0x00040004 ...
3340 TIMERS=0xfff00980
3341 Using timer 1
3342 tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0
wdenkc6097192002-11-03 00:24:07 +00003343
wdenk2729af92004-05-03 20:45:30 +00003344Hit 'b':
3345 [q, b, e, ?] Set interval 1000000 us
3346 Enabling timer
3347Hit '?':
3348 [q, b, e, ?] ........
3349 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0
3350Hit '?':
3351 [q, b, e, ?] .
3352 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0
3353Hit '?':
3354 [q, b, e, ?] .
3355 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0
3356Hit '?':
3357 [q, b, e, ?] .
3358 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0
3359Hit 'e':
3360 [q, b, e, ?] ...Stopping timer
3361Hit 'q':
3362 [q, b, e, ?] ## Application terminated, rc = 0x0
wdenkc6097192002-11-03 00:24:07 +00003363
3364
wdenk2729af92004-05-03 20:45:30 +00003365Minicom warning:
3366================
wdenk85ec0bc2003-03-31 16:34:49 +00003367
wdenk2729af92004-05-03 20:45:30 +00003368Over time, many people have reported problems when trying to use the
3369"minicom" terminal emulation program for serial download. I (wd)
3370consider minicom to be broken, and recommend not to use it. Under
3371Unix, I recommend to use C-Kermit for general purpose use (and
3372especially for kermit binary protocol download ("loadb" command), and
3373use "cu" for S-Record download ("loads" command).
wdenk85ec0bc2003-03-31 16:34:49 +00003374
wdenk2729af92004-05-03 20:45:30 +00003375Nevertheless, if you absolutely want to use it try adding this
3376configuration to your "File transfer protocols" section:
wdenk52f52c12003-06-19 23:04:19 +00003377
wdenk2729af92004-05-03 20:45:30 +00003378 Name Program Name U/D FullScr IO-Red. Multi
3379 X kermit /usr/bin/kermit -i -l %l -s Y U Y N N
3380 Y kermit /usr/bin/kermit -i -l %l -r N D Y N N
wdenk52f52c12003-06-19 23:04:19 +00003381
3382
wdenk2729af92004-05-03 20:45:30 +00003383NetBSD Notes:
3384=============
wdenkc6097192002-11-03 00:24:07 +00003385
wdenk2729af92004-05-03 20:45:30 +00003386Starting at version 0.9.2, U-Boot supports NetBSD both as host
3387(build U-Boot) and target system (boots NetBSD/mpc8xx).
wdenkc6097192002-11-03 00:24:07 +00003388
wdenk2729af92004-05-03 20:45:30 +00003389Building requires a cross environment; it is known to work on
3390NetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also
3391need gmake since the Makefiles are not compatible with BSD make).
3392Note that the cross-powerpc package does not install include files;
3393attempting to build U-Boot will fail because <machine/ansi.h> is
3394missing. This file has to be installed and patched manually:
wdenkc6097192002-11-03 00:24:07 +00003395
wdenk2729af92004-05-03 20:45:30 +00003396 # cd /usr/pkg/cross/powerpc-netbsd/include
3397 # mkdir powerpc
3398 # ln -s powerpc machine
3399 # cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h
3400 # ${EDIT} powerpc/ansi.h ## must remove __va_list, _BSD_VA_LIST
wdenkc6097192002-11-03 00:24:07 +00003401
wdenk2729af92004-05-03 20:45:30 +00003402Native builds *don't* work due to incompatibilities between native
3403and U-Boot include files.
wdenkc6097192002-11-03 00:24:07 +00003404
wdenk2729af92004-05-03 20:45:30 +00003405Booting assumes that (the first part of) the image booted is a
3406stage-2 loader which in turn loads and then invokes the kernel
3407proper. Loader sources will eventually appear in the NetBSD source
3408tree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the
wdenk2a8af182005-04-13 10:02:42 +00003409meantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz
wdenkc6097192002-11-03 00:24:07 +00003410
3411
wdenk2729af92004-05-03 20:45:30 +00003412Implementation Internals:
3413=========================
wdenkc6097192002-11-03 00:24:07 +00003414
wdenk2729af92004-05-03 20:45:30 +00003415The following is not intended to be a complete description of every
3416implementation detail. However, it should help to understand the
3417inner workings of U-Boot and make it easier to port it to custom
3418hardware.
wdenkc6097192002-11-03 00:24:07 +00003419
3420
wdenk2729af92004-05-03 20:45:30 +00003421Initial Stack, Global Data:
3422---------------------------
wdenkc6097192002-11-03 00:24:07 +00003423
wdenk2729af92004-05-03 20:45:30 +00003424The implementation of U-Boot is complicated by the fact that U-Boot
3425starts running out of ROM (flash memory), usually without access to
3426system RAM (because the memory controller is not initialized yet).
3427This means that we don't have writable Data or BSS segments, and BSS
3428is not initialized as zero. To be able to get a C environment working
3429at all, we have to allocate at least a minimal stack. Implementation
3430options for this are defined and restricted by the CPU used: Some CPU
3431models provide on-chip memory (like the IMMR area on MPC8xx and
3432MPC826x processors), on others (parts of) the data cache can be
3433locked as (mis-) used as memory, etc.
wdenkc6097192002-11-03 00:24:07 +00003434
wdenk2729af92004-05-03 20:45:30 +00003435 Chris Hallinan posted a good summary of these issues to the
3436 u-boot-users mailing list:
wdenk43d96162003-03-06 00:02:04 +00003437
wdenk2729af92004-05-03 20:45:30 +00003438 Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)?
3439 From: "Chris Hallinan" <clh@net1plus.com>
3440 Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET)
3441 ...
wdenk43d96162003-03-06 00:02:04 +00003442
wdenk2729af92004-05-03 20:45:30 +00003443 Correct me if I'm wrong, folks, but the way I understand it
3444 is this: Using DCACHE as initial RAM for Stack, etc, does not
3445 require any physical RAM backing up the cache. The cleverness
3446 is that the cache is being used as a temporary supply of
3447 necessary storage before the SDRAM controller is setup. It's
3448 beyond the scope of this list to expain the details, but you
3449 can see how this works by studying the cache architecture and
3450 operation in the architecture and processor-specific manuals.
wdenk43d96162003-03-06 00:02:04 +00003451
wdenk2729af92004-05-03 20:45:30 +00003452 OCM is On Chip Memory, which I believe the 405GP has 4K. It
3453 is another option for the system designer to use as an
3454 initial stack/ram area prior to SDRAM being available. Either
3455 option should work for you. Using CS 4 should be fine if your
3456 board designers haven't used it for something that would
3457 cause you grief during the initial boot! It is frequently not
3458 used.
wdenk43d96162003-03-06 00:02:04 +00003459
wdenk2729af92004-05-03 20:45:30 +00003460 CFG_INIT_RAM_ADDR should be somewhere that won't interfere
3461 with your processor/board/system design. The default value
3462 you will find in any recent u-boot distribution in
Stefan Roese8a316c92005-08-01 16:49:12 +02003463 walnut.h should work for you. I'd set it to a value larger
wdenk2729af92004-05-03 20:45:30 +00003464 than your SDRAM module. If you have a 64MB SDRAM module, set
3465 it above 400_0000. Just make sure your board has no resources
3466 that are supposed to respond to that address! That code in
3467 start.S has been around a while and should work as is when
3468 you get the config right.
wdenk43d96162003-03-06 00:02:04 +00003469
wdenk2729af92004-05-03 20:45:30 +00003470 -Chris Hallinan
3471 DS4.COM, Inc.
wdenk43d96162003-03-06 00:02:04 +00003472
wdenk2729af92004-05-03 20:45:30 +00003473It is essential to remember this, since it has some impact on the C
3474code for the initialization procedures:
wdenkc6097192002-11-03 00:24:07 +00003475
wdenk2729af92004-05-03 20:45:30 +00003476* Initialized global data (data segment) is read-only. Do not attempt
3477 to write it.
wdenkc6097192002-11-03 00:24:07 +00003478
wdenk2729af92004-05-03 20:45:30 +00003479* Do not use any unitialized global data (or implicitely initialized
3480 as zero data - BSS segment) at all - this is undefined, initiali-
3481 zation is performed later (when relocating to RAM).
wdenkc6097192002-11-03 00:24:07 +00003482
wdenk2729af92004-05-03 20:45:30 +00003483* Stack space is very limited. Avoid big data buffers or things like
3484 that.
wdenkc6097192002-11-03 00:24:07 +00003485
wdenk2729af92004-05-03 20:45:30 +00003486Having only the stack as writable memory limits means we cannot use
3487normal global data to share information beween the code. But it
3488turned out that the implementation of U-Boot can be greatly
3489simplified by making a global data structure (gd_t) available to all
3490functions. We could pass a pointer to this data as argument to _all_
3491functions, but this would bloat the code. Instead we use a feature of
3492the GCC compiler (Global Register Variables) to share the data: we
3493place a pointer (gd) to the global data into a register which we
3494reserve for this purpose.
wdenkc6097192002-11-03 00:24:07 +00003495
wdenk2729af92004-05-03 20:45:30 +00003496When choosing a register for such a purpose we are restricted by the
3497relevant (E)ABI specifications for the current architecture, and by
3498GCC's implementation.
wdenkc6097192002-11-03 00:24:07 +00003499
wdenk2729af92004-05-03 20:45:30 +00003500For PowerPC, the following registers have specific use:
3501 R1: stack pointer
3502 R2: TOC pointer
3503 R3-R4: parameter passing and return values
3504 R5-R10: parameter passing
3505 R13: small data area pointer
3506 R30: GOT pointer
3507 R31: frame pointer
wdenkc6097192002-11-03 00:24:07 +00003508
wdenk2729af92004-05-03 20:45:30 +00003509 (U-Boot also uses R14 as internal GOT pointer.)
wdenkc6097192002-11-03 00:24:07 +00003510
wdenk2729af92004-05-03 20:45:30 +00003511 ==> U-Boot will use R29 to hold a pointer to the global data
wdenkc6097192002-11-03 00:24:07 +00003512
wdenk2729af92004-05-03 20:45:30 +00003513 Note: on PPC, we could use a static initializer (since the
3514 address of the global data structure is known at compile time),
3515 but it turned out that reserving a register results in somewhat
3516 smaller code - although the code savings are not that big (on
3517 average for all boards 752 bytes for the whole U-Boot image,
3518 624 text + 127 data).
wdenkc6097192002-11-03 00:24:07 +00003519
Mike Frysinger4c58eb52008-02-04 19:26:54 -05003520On Blackfin, the normal C ABI (except for P5) is followed as documented here:
3521 http://docs.blackfin.uclinux.org/doku.php?id=application_binary_interface
3522
3523 ==> U-Boot will use P5 to hold a pointer to the global data
3524
wdenk2729af92004-05-03 20:45:30 +00003525On ARM, the following registers are used:
wdenkc6097192002-11-03 00:24:07 +00003526
wdenk2729af92004-05-03 20:45:30 +00003527 R0: function argument word/integer result
3528 R1-R3: function argument word
3529 R9: GOT pointer
3530 R10: stack limit (used only if stack checking if enabled)
3531 R11: argument (frame) pointer
3532 R12: temporary workspace
3533 R13: stack pointer
3534 R14: link register
3535 R15: program counter
wdenkc6097192002-11-03 00:24:07 +00003536
wdenk2729af92004-05-03 20:45:30 +00003537 ==> U-Boot will use R8 to hold a pointer to the global data
wdenkc6097192002-11-03 00:24:07 +00003538
Wolfgang Denkd87080b2006-03-31 18:32:53 +02003539NOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope,
3540or current versions of GCC may "optimize" the code too much.
wdenkc6097192002-11-03 00:24:07 +00003541
wdenk2729af92004-05-03 20:45:30 +00003542Memory Management:
3543------------------
wdenkc6097192002-11-03 00:24:07 +00003544
wdenk2729af92004-05-03 20:45:30 +00003545U-Boot runs in system state and uses physical addresses, i.e. the
3546MMU is not used either for address mapping nor for memory protection.
wdenkc6097192002-11-03 00:24:07 +00003547
wdenk2729af92004-05-03 20:45:30 +00003548The available memory is mapped to fixed addresses using the memory
3549controller. In this process, a contiguous block is formed for each
3550memory type (Flash, SDRAM, SRAM), even when it consists of several
3551physical memory banks.
wdenkc6097192002-11-03 00:24:07 +00003552
wdenk2729af92004-05-03 20:45:30 +00003553U-Boot is installed in the first 128 kB of the first Flash bank (on
3554TQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After
3555booting and sizing and initializing DRAM, the code relocates itself
3556to the upper end of DRAM. Immediately below the U-Boot code some
3557memory is reserved for use by malloc() [see CFG_MALLOC_LEN
3558configuration setting]. Below that, a structure with global Board
3559Info data is placed, followed by the stack (growing downward).
wdenkc6097192002-11-03 00:24:07 +00003560
wdenk2729af92004-05-03 20:45:30 +00003561Additionally, some exception handler code is copied to the low 8 kB
3562of DRAM (0x00000000 ... 0x00001FFF).
wdenkc6097192002-11-03 00:24:07 +00003563
wdenk2729af92004-05-03 20:45:30 +00003564So a typical memory configuration with 16 MB of DRAM could look like
3565this:
wdenkc6097192002-11-03 00:24:07 +00003566
wdenk2729af92004-05-03 20:45:30 +00003567 0x0000 0000 Exception Vector code
3568 :
3569 0x0000 1FFF
3570 0x0000 2000 Free for Application Use
3571 :
3572 :
wdenkc6097192002-11-03 00:24:07 +00003573
wdenk2729af92004-05-03 20:45:30 +00003574 :
3575 :
3576 0x00FB FF20 Monitor Stack (Growing downward)
3577 0x00FB FFAC Board Info Data and permanent copy of global data
3578 0x00FC 0000 Malloc Arena
3579 :
3580 0x00FD FFFF
3581 0x00FE 0000 RAM Copy of Monitor Code
3582 ... eventually: LCD or video framebuffer
3583 ... eventually: pRAM (Protected RAM - unchanged by reset)
3584 0x00FF FFFF [End of RAM]
wdenkc6097192002-11-03 00:24:07 +00003585
3586
wdenk2729af92004-05-03 20:45:30 +00003587System Initialization:
3588----------------------
wdenkc6097192002-11-03 00:24:07 +00003589
wdenk2729af92004-05-03 20:45:30 +00003590In the reset configuration, U-Boot starts at the reset entry point
3591(on most PowerPC systens at address 0x00000100). Because of the reset
3592configuration for CS0# this is a mirror of the onboard Flash memory.
3593To be able to re-map memory U-Boot then jumps to its link address.
3594To be able to implement the initialization code in C, a (small!)
3595initial stack is set up in the internal Dual Ported RAM (in case CPUs
3596which provide such a feature like MPC8xx or MPC8260), or in a locked
3597part of the data cache. After that, U-Boot initializes the CPU core,
3598the caches and the SIU.
wdenkc6097192002-11-03 00:24:07 +00003599
wdenk2729af92004-05-03 20:45:30 +00003600Next, all (potentially) available memory banks are mapped using a
3601preliminary mapping. For example, we put them on 512 MB boundaries
3602(multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash
3603on 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is
3604programmed for SDRAM access. Using the temporary configuration, a
3605simple memory test is run that determines the size of the SDRAM
3606banks.
wdenkc6097192002-11-03 00:24:07 +00003607
wdenk2729af92004-05-03 20:45:30 +00003608When there is more than one SDRAM bank, and the banks are of
3609different size, the largest is mapped first. For equal size, the first
3610bank (CS2#) is mapped first. The first mapping is always for address
36110x00000000, with any additional banks following immediately to create
3612contiguous memory starting from 0.
wdenkc6097192002-11-03 00:24:07 +00003613
wdenk2729af92004-05-03 20:45:30 +00003614Then, the monitor installs itself at the upper end of the SDRAM area
3615and allocates memory for use by malloc() and for the global Board
3616Info data; also, the exception vector code is copied to the low RAM
3617pages, and the final stack is set up.
wdenkc6097192002-11-03 00:24:07 +00003618
wdenk2729af92004-05-03 20:45:30 +00003619Only after this relocation will you have a "normal" C environment;
3620until that you are restricted in several ways, mostly because you are
3621running from ROM, and because the code will have to be relocated to a
3622new address in RAM.
wdenkc6097192002-11-03 00:24:07 +00003623
3624
wdenk2729af92004-05-03 20:45:30 +00003625U-Boot Porting Guide:
3626----------------------
wdenkc6097192002-11-03 00:24:07 +00003627
wdenk2729af92004-05-03 20:45:30 +00003628[Based on messages by Jerry Van Baren in the U-Boot-Users mailing
3629list, October 2002]
wdenkc6097192002-11-03 00:24:07 +00003630
3631
wdenk2729af92004-05-03 20:45:30 +00003632int main (int argc, char *argv[])
3633{
3634 sighandler_t no_more_time;
wdenkc6097192002-11-03 00:24:07 +00003635
wdenk2729af92004-05-03 20:45:30 +00003636 signal (SIGALRM, no_more_time);
3637 alarm (PROJECT_DEADLINE - toSec (3 * WEEK));
wdenkc6097192002-11-03 00:24:07 +00003638
wdenk2729af92004-05-03 20:45:30 +00003639 if (available_money > available_manpower) {
3640 pay consultant to port U-Boot;
wdenkc6097192002-11-03 00:24:07 +00003641 return 0;
3642 }
3643
wdenk2729af92004-05-03 20:45:30 +00003644 Download latest U-Boot source;
3645
3646 Subscribe to u-boot-users mailing list;
3647
3648 if (clueless) {
3649 email ("Hi, I am new to U-Boot, how do I get started?");
wdenkc6097192002-11-03 00:24:07 +00003650 }
3651
wdenk2729af92004-05-03 20:45:30 +00003652 while (learning) {
3653 Read the README file in the top level directory;
3654 Read http://www.denx.de/twiki/bin/view/DULG/Manual ;
3655 Read the source, Luke;
3656 }
wdenkc6097192002-11-03 00:24:07 +00003657
wdenk2729af92004-05-03 20:45:30 +00003658 if (available_money > toLocalCurrency ($2500)) {
3659 Buy a BDI2000;
3660 } else {
3661 Add a lot of aggravation and time;
3662 }
wdenkc6097192002-11-03 00:24:07 +00003663
wdenk2729af92004-05-03 20:45:30 +00003664 Create your own board support subdirectory;
wdenkc6097192002-11-03 00:24:07 +00003665
wdenk2729af92004-05-03 20:45:30 +00003666 Create your own board config file;
wdenk6aff3112002-12-17 01:51:00 +00003667
wdenk2729af92004-05-03 20:45:30 +00003668 while (!running) {
3669 do {
3670 Add / modify source code;
3671 } until (compiles);
3672 Debug;
3673 if (clueless)
3674 email ("Hi, I am having problems...");
3675 }
3676 Send patch file to Wolfgang;
wdenkc6097192002-11-03 00:24:07 +00003677
wdenk2729af92004-05-03 20:45:30 +00003678 return 0;
3679}
3680
3681void no_more_time (int sig)
3682{
3683 hire_a_guru();
3684}
wdenkc6097192002-11-03 00:24:07 +00003685
3686
wdenk2729af92004-05-03 20:45:30 +00003687Coding Standards:
3688-----------------
wdenkc6097192002-11-03 00:24:07 +00003689
wdenk2729af92004-05-03 20:45:30 +00003690All contributions to U-Boot should conform to the Linux kernel
Detlev Zundel2c051652006-09-01 15:39:02 +02003691coding style; see the file "Documentation/CodingStyle" and the script
3692"scripts/Lindent" in your Linux kernel source directory. In sources
3693originating from U-Boot a style corresponding to "Lindent -pcs" (adding
3694spaces before parameters to function calls) is actually used.
wdenk2729af92004-05-03 20:45:30 +00003695
Detlev Zundel2c051652006-09-01 15:39:02 +02003696Source files originating from a different project (for example the
3697MTD subsystem) are generally exempt from these guidelines and are not
3698reformated to ease subsequent migration to newer versions of those
3699sources.
3700
3701Please note that U-Boot is implemented in C (and to some small parts in
3702Assembler); no C++ is used, so please do not use C++ style comments (//)
3703in your code.
wdenk2729af92004-05-03 20:45:30 +00003704
3705Please also stick to the following formatting rules:
3706- remove any trailing white space
3707- use TAB characters for indentation, not spaces
3708- make sure NOT to use DOS '\r\n' line feeds
3709- do not add more than 2 empty lines to source files
3710- do not add trailing empty lines to source files
3711
3712Submissions which do not conform to the standards may be returned
3713with a request to reformat the changes.
wdenkc6097192002-11-03 00:24:07 +00003714
3715
wdenk2729af92004-05-03 20:45:30 +00003716Submitting Patches:
3717-------------------
wdenkc6097192002-11-03 00:24:07 +00003718
wdenk2729af92004-05-03 20:45:30 +00003719Since the number of patches for U-Boot is growing, we need to
3720establish some rules. Submissions which do not conform to these rules
3721may be rejected, even when they contain important and valuable stuff.
wdenkc6097192002-11-03 00:24:07 +00003722
wdenk90dc6702005-05-03 14:12:25 +00003723Patches shall be sent to the u-boot-users mailing list.
wdenkc6097192002-11-03 00:24:07 +00003724
wdenk2729af92004-05-03 20:45:30 +00003725When you send a patch, please include the following information with
3726it:
wdenkc6097192002-11-03 00:24:07 +00003727
wdenk2729af92004-05-03 20:45:30 +00003728* For bug fixes: a description of the bug and how your patch fixes
3729 this bug. Please try to include a way of demonstrating that the
3730 patch actually fixes something.
wdenkc6097192002-11-03 00:24:07 +00003731
wdenk2729af92004-05-03 20:45:30 +00003732* For new features: a description of the feature and your
3733 implementation.
wdenkc6097192002-11-03 00:24:07 +00003734
wdenk2729af92004-05-03 20:45:30 +00003735* A CHANGELOG entry as plaintext (separate from the patch)
3736
3737* For major contributions, your entry to the CREDITS file
3738
3739* When you add support for a new board, don't forget to add this
3740 board to the MAKEALL script, too.
3741
3742* If your patch adds new configuration options, don't forget to
3743 document these in the README file.
3744
3745* The patch itself. If you are accessing the CVS repository use "cvs
3746 update; cvs diff -puRN"; else, use "diff -purN OLD NEW". If your
3747 version of diff does not support these options, then get the latest
3748 version of GNU diff.
3749
3750 The current directory when running this command shall be the top
3751 level directory of the U-Boot source tree, or it's parent directory
3752 (i. e. please make sure that your patch includes sufficient
3753 directory information for the affected files).
3754
3755 We accept patches as plain text, MIME attachments or as uuencoded
3756 gzipped text.
3757
3758* If one logical set of modifications affects or creates several
3759 files, all these changes shall be submitted in a SINGLE patch file.
3760
3761* Changesets that contain different, unrelated modifications shall be
3762 submitted as SEPARATE patches, one patch per changeset.
3763
3764
3765Notes:
3766
3767* Before sending the patch, run the MAKEALL script on your patched
3768 source tree and make sure that no errors or warnings are reported
3769 for any of the boards.
3770
3771* Keep your modifications to the necessary minimum: A patch
3772 containing several unrelated changes or arbitrary reformats will be
3773 returned with a request to re-formatting / split it.
3774
3775* If you modify existing code, make sure that your new code does not
3776 add to the memory footprint of the code ;-) Small is beautiful!
3777 When adding new features, these should compile conditionally only
3778 (using #ifdef), and the resulting code with the new feature
3779 disabled must not need more memory than the old code without your
3780 modification.
wdenk90dc6702005-05-03 14:12:25 +00003781
3782* Remember that there is a size limit of 40 kB per message on the
3783 u-boot-users mailing list. Compression may help.