README 153 KB
Newer Older
wdenk's avatar
wdenk committed
1
#
2
# (C) Copyright 2000 - 2011
wdenk's avatar
wdenk committed
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
#
# See file CREDITS for list of people who contributed to this
# project.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 2 of
# the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
# MA 02111-1307 USA
#

Summary:
========

27
This directory contains the source code for U-Boot, a boot loader for
wdenk's avatar
wdenk committed
28
29
30
31
Embedded boards based on PowerPC, ARM, MIPS and several other
processors, which can be installed in a boot ROM and used to
initialize and test the hardware or to download and run application
code.
wdenk's avatar
wdenk committed
32
33

The development of U-Boot is closely related to Linux: some parts of
34
35
the source code originate in the Linux source tree, we have some
header files in common, and special provision has been made to
wdenk's avatar
wdenk committed
36
37
38
39
40
41
42
43
44
45
46
47
48
49
support booting of Linux images.

Some attention has been paid to make this software easily
configurable and extendable. For instance, all monitor commands are
implemented with the same call interface, so that it's very easy to
add new commands. Also, instead of permanently adding rarely used
code (for instance hardware test utilities) to the monitor, you can
load and run it dynamically.


Status:
=======

In general, all boards for which a configuration option exists in the
50
Makefile have been tested to some extent and can be considered
wdenk's avatar
wdenk committed
51
52
"working". In fact, many of them are used in production systems.

53
In case of problems see the CHANGELOG and CREDITS files to find out
54
55
who contributed the specific port. The MAINTAINERS file lists board
maintainers.
wdenk's avatar
wdenk committed
56
57
58
59
60


Where to get help:
==================

61
62
In case you have questions about, problems with or contributions for
U-Boot you should send a message to the U-Boot mailing list at
63
64
65
66
<u-boot@lists.denx.de>. There is also an archive of previous traffic
on the mailing list - please search the archive before asking FAQ's.
Please see http://lists.denx.de/pipermail/u-boot and
http://dir.gmane.org/gmane.comp.boot-loaders.u-boot
wdenk's avatar
wdenk committed
67
68


69
70
71
72
73
74
75
76
Where to get source code:
=========================

The U-Boot source code is maintained in the git repository at
git://www.denx.de/git/u-boot.git ; you can browse it online at
http://www.denx.de/cgi-bin/gitweb.cgi?p=u-boot.git;a=summary

The "snapshot" links on this page allow you to download tarballs of
77
any version you might be interested in. Official releases are also
78
79
80
available for FTP download from the ftp://ftp.denx.de/pub/u-boot/
directory.

81
Pre-built (and tested) images are available from
82
83
84
ftp://ftp.denx.de/pub/u-boot/images/


wdenk's avatar
wdenk committed
85
86
87
88
Where we come from:
===================

- start from 8xxrom sources
89
- create PPCBoot project (http://sourceforge.net/projects/ppcboot)
wdenk's avatar
wdenk committed
90
91
92
93
94
95
96
- clean up code
- make it easier to add custom boards
- make it possible to add other [PowerPC] CPUs
- extend functions, especially:
  * Provide extended interface to Linux boot loader
  * S-Record download
  * network boot
97
  * PCMCIA / CompactFlash / ATA disk / SCSI ... boot
98
- create ARMBoot project (http://sourceforge.net/projects/armboot)
wdenk's avatar
wdenk committed
99
- add other CPU families (starting with ARM)
100
- create U-Boot project (http://sourceforge.net/projects/u-boot)
Magnus Lilja's avatar
Magnus Lilja committed
101
- current project page: see http://www.denx.de/wiki/U-Boot
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123


Names and Spelling:
===================

The "official" name of this project is "Das U-Boot". The spelling
"U-Boot" shall be used in all written text (documentation, comments
in source files etc.). Example:

	This is the README file for the U-Boot project.

File names etc. shall be based on the string "u-boot". Examples:

	include/asm-ppc/u-boot.h

	#include <asm/u-boot.h>

Variable names, preprocessor constants etc. shall be either based on
the string "u_boot" or on "U_BOOT". Example:

	U_BOOT_VERSION		u_boot_logo
	IH_OS_U_BOOT		u_boot_hush_start
wdenk's avatar
wdenk committed
124
125


wdenk's avatar
wdenk committed
126
127
128
Versioning:
===========

129
130
131
132
133
134
135
136
137
138
139
Starting with the release in October 2008, the names of the releases
were changed from numerical release numbers without deeper meaning
into a time stamp based numbering. Regular releases are identified by
names consisting of the calendar year and month of the release date.
Additional fields (if present) indicate release candidates or bug fix
releases in "stable" maintenance trees.

Examples:
	U-Boot v2009.11     - Release November 2009
	U-Boot v2009.11.1   - Release 1 in version November 2009 stable tree
	U-Boot v2010.09-rc1 - Release candiate 1 for September 2010 release
wdenk's avatar
wdenk committed
140
141


wdenk's avatar
wdenk committed
142
143
144
Directory Hierarchy:
====================

145
146
147
148
149
/arch			Architecture specific files
  /arm			Files generic to ARM architecture
    /cpu		CPU specific files
      /arm720t		Files specific to ARM 720 CPUs
      /arm920t		Files specific to ARM 920 CPUs
Wolfgang Denk's avatar
Wolfgang Denk committed
150
151
152
	/at91rm9200	Files specific to Atmel AT91RM9200 CPU
	/imx		Files specific to Freescale MC9328 i.MX CPUs
	/s3c24x0	Files specific to Samsung S3C24X0 CPUs
153
154
155
156
157
158
159
160
161
162
163
164
165
166
      /arm925t		Files specific to ARM 925 CPUs
      /arm926ejs	Files specific to ARM 926 CPUs
      /arm1136		Files specific to ARM 1136 CPUs
      /ixp		Files specific to Intel XScale IXP CPUs
      /pxa		Files specific to Intel XScale PXA CPUs
      /s3c44b0		Files specific to Samsung S3C44B0 CPUs
      /sa1100		Files specific to Intel StrongARM SA1100 CPUs
    /lib		Architecture specific library files
  /avr32		Files generic to AVR32 architecture
    /cpu		CPU specific files
    /lib		Architecture specific library files
  /blackfin		Files generic to Analog Devices Blackfin architecture
    /cpu		CPU specific files
    /lib		Architecture specific library files
Graeme Russ's avatar
Graeme Russ committed
167
  /x86			Files generic to x86 architecture
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
    /cpu		CPU specific files
    /lib		Architecture specific library files
  /m68k			Files generic to m68k architecture
    /cpu		CPU specific files
      /mcf52x2		Files specific to Freescale ColdFire MCF52x2 CPUs
      /mcf5227x		Files specific to Freescale ColdFire MCF5227x CPUs
      /mcf532x		Files specific to Freescale ColdFire MCF5329 CPUs
      /mcf5445x		Files specific to Freescale ColdFire MCF5445x CPUs
      /mcf547x_8x	Files specific to Freescale ColdFire MCF547x_8x CPUs
    /lib		Architecture specific library files
  /microblaze		Files generic to microblaze architecture
    /cpu		CPU specific files
    /lib		Architecture specific library files
  /mips			Files generic to MIPS architecture
    /cpu		CPU specific files
    /lib		Architecture specific library files
  /nios2		Files generic to Altera NIOS2 architecture
    /cpu		CPU specific files
    /lib		Architecture specific library files
Stefan Roese's avatar
Stefan Roese committed
187
  /powerpc		Files generic to PowerPC architecture
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
    /cpu		CPU specific files
      /74xx_7xx		Files specific to Freescale MPC74xx and 7xx CPUs
      /mpc5xx		Files specific to Freescale MPC5xx CPUs
      /mpc5xxx		Files specific to Freescale MPC5xxx CPUs
      /mpc8xx		Files specific to Freescale MPC8xx CPUs
      /mpc8220		Files specific to Freescale MPC8220 CPUs
      /mpc824x		Files specific to Freescale MPC824x CPUs
      /mpc8260		Files specific to Freescale MPC8260 CPUs
      /mpc85xx		Files specific to Freescale MPC85xx CPUs
      /ppc4xx		Files specific to AMCC PowerPC 4xx CPUs
    /lib		Architecture specific library files
  /sh			Files generic to SH architecture
    /cpu		CPU specific files
      /sh2		Files specific to sh2 CPUs
      /sh3		Files specific to sh3 CPUs
      /sh4		Files specific to sh4 CPUs
    /lib		Architecture specific library files
  /sparc		Files generic to SPARC architecture
    /cpu		CPU specific files
      /leon2		Files specific to Gaisler LEON2 SPARC CPU
      /leon3		Files specific to Gaisler LEON3 SPARC CPU
    /lib		Architecture specific library files
/api			Machine/arch independent API for external apps
/board			Board dependent files
/common			Misc architecture independent functions
/disk			Code for disk drive partition handling
/doc			Documentation (don't expect too much)
/drivers		Commonly used device drivers
/examples		Example code for standalone applications, etc.
/fs			Filesystem code (cramfs, ext2, jffs2, etc.)
/include		Header Files
/lib			Files generic to all architectures
  /libfdt		Library files to support flattened device trees
  /lzma			Library files to support LZMA decompression
  /lzo			Library files to support LZO decompression
/net			Networking code
/post			Power On Self Test
/rtc			Real Time Clock drivers
/tools			Tools to build S-Record or U-Boot images, etc.
wdenk's avatar
wdenk committed
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242

Software Configuration:
=======================

Configuration is usually done using C preprocessor defines; the
rationale behind that is to avoid dead code whenever possible.

There are two classes of configuration variables:

* Configuration _OPTIONS_:
  These are selectable by the user and have names beginning with
  "CONFIG_".

* Configuration _SETTINGS_:
  These depend on the hardware etc. and should not be meddled with if
  you don't know what you're doing; they have names beginning with
243
  "CONFIG_SYS_".
wdenk's avatar
wdenk committed
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262

Later we will add a configuration tool - probably similar to or even
identical to what's used for the Linux kernel. Right now, we have to
do the configuration by hand, which means creating some symbolic
links and editing some configuration files. We use the TQM8xxL boards
as an example here.


Selection of Processor Architecture and Board Type:
---------------------------------------------------

For all supported boards there are ready-to-use default
configurations available; just type "make <board_name>_config".

Example: For a TQM823L module type:

	cd u-boot
	make TQM823L_config

263
For the Cogent platform, you need to specify the CPU type as well;
wdenk's avatar
wdenk committed
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
e.g. "make cogent_mpc8xx_config". And also configure the cogent
directory according to the instructions in cogent/README.


Configuration Options:
----------------------

Configuration depends on the combination of board and CPU type; all
such information is kept in a configuration file
"include/configs/<board_name>.h".

Example: For a TQM823L module, all configuration settings are in
"include/configs/TQM823L.h".


wdenk's avatar
wdenk committed
279
280
281
282
283
Many of the options are named exactly as the corresponding Linux
kernel configuration options. The intention is to make it easier to
build a config tool - later.


wdenk's avatar
wdenk committed
284
285
The following options need to be configured:

286
287
288
- CPU Type:	Define exactly one, e.g. CONFIG_MPC85XX.

- Board Type:	Define exactly one, e.g. CONFIG_MPC8540ADS.
289
290

- CPU Daughterboard Type: (if CONFIG_ATSTK1000 is defined)
291
		Define exactly one, e.g. CONFIG_ATSTK1002
wdenk's avatar
wdenk committed
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310

- CPU Module Type: (if CONFIG_COGENT is defined)
		Define exactly one of
		CONFIG_CMA286_60_OLD
--- FIXME --- not tested yet:
		CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P,
		CONFIG_CMA287_23, CONFIG_CMA287_50

- Motherboard Type: (if CONFIG_COGENT is defined)
		Define exactly one of
		CONFIG_CMA101, CONFIG_CMA102

- Motherboard I/O Modules: (if CONFIG_COGENT is defined)
		Define one or more of
		CONFIG_CMA302

- Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined)
		Define one or more of
		CONFIG_LCD_HEARTBEAT	- update a character position on
311
					  the LCD display every second with
wdenk's avatar
wdenk committed
312
313
					  a "rotator" |\-/|\-/

wdenk's avatar
wdenk committed
314
315
316
- Board flavour: (if CONFIG_MPC8260ADS is defined)
		CONFIG_ADSTYPE
		Possible values are:
317
318
319
320
			CONFIG_SYS_8260ADS	- original MPC8260ADS
			CONFIG_SYS_8266ADS	- MPC8266ADS
			CONFIG_SYS_PQ2FADS	- PQ2FADS-ZU or PQ2FADS-VR
			CONFIG_SYS_8272ADS	- MPC8272ADS
wdenk's avatar
wdenk committed
321

322
323
324
325
326
- Marvell Family Member
		CONFIG_SYS_MVFS		- define it if you want to enable
					  multiple fs option at one time
					  for marvell soc family

wdenk's avatar
wdenk committed
327
- MPC824X Family Member (if CONFIG_MPC824X is defined)
wdenk's avatar
wdenk committed
328
329
		Define exactly one of
		CONFIG_MPC8240, CONFIG_MPC8245
wdenk's avatar
wdenk committed
330

331
- 8xx CPU Options: (if using an MPC8xx CPU)
wdenk's avatar
wdenk committed
332
333
		CONFIG_8xx_GCLK_FREQ	- deprecated: CPU clock if
					  get_gclk_freq() cannot work
wdenk's avatar
wdenk committed
334
335
					  e.g. if there is no 32KHz
					  reference PIT/RTC clock
wdenk's avatar
wdenk committed
336
337
		CONFIG_8xx_OSCLK	- PLL input clock (either EXTCLK
					  or XTAL/EXTAL)
wdenk's avatar
wdenk committed
338

wdenk's avatar
wdenk committed
339
- 859/866/885 CPU options: (if using a MPC859 or MPC866 or MPC885 CPU):
340
341
		CONFIG_SYS_8xx_CPUCLK_MIN
		CONFIG_SYS_8xx_CPUCLK_MAX
wdenk's avatar
wdenk committed
342
		CONFIG_8xx_CPUCLK_DEFAULT
343
344
			See doc/README.MPC866

345
		CONFIG_SYS_MEASURE_CPUCLK
346

wdenk's avatar
wdenk committed
347
348
349
350
351
		Define this to measure the actual CPU clock instead
		of relying on the correctness of the configured
		values. Mostly useful for board bringup to make sure
		the PLL is locked at the intended frequency. Note
		that this requires a (stable) reference clock (32 kHz
352
		RTC clock or CONFIG_SYS_8XX_XIN)
353

354
355
356
357
358
		CONFIG_SYS_DELAYED_ICACHE

		Define this option if you want to enable the
		ICache only when Code runs from RAM.

359
360
361
362
363
364
365
- 85xx CPU Options:
		CONFIG_SYS_FSL_TBCLK_DIV

		Defines the core time base clock divider ratio compared to the
		system clock.  On most PQ3 devices this is 8, on newer QorIQ
		devices it can be 16 or 32.  The ratio varies from SoC to Soc.

366
367
368
369
370
		CONFIG_SYS_FSL_PCIE_COMPAT

		Defines the string to utilize when trying to match PCIe device
		tree nodes for the given platform.

371
- Intel Monahans options:
372
		CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO
373
374
375
376
377

		Defines the Monahans run mode to oscillator
		ratio. Valid values are 8, 16, 24, 31. The core
		frequency is this value multiplied by 13 MHz.

378
		CONFIG_SYS_MONAHANS_TURBO_RUN_MODE_RATIO
Wolfgang Denk's avatar
Wolfgang Denk committed
379

380
381
		Defines the Monahans turbo mode to oscillator
		ratio. Valid values are 1 (default if undefined) and
Wolfgang Denk's avatar
Wolfgang Denk committed
382
		2. The core frequency as calculated above is multiplied
383
		by this value.
Wolfgang Denk's avatar
Wolfgang Denk committed
384

wdenk's avatar
wdenk committed
385
- Linux Kernel Interface:
wdenk's avatar
wdenk committed
386
387
388
389
390
391
392
393
394
395
		CONFIG_CLOCKS_IN_MHZ

		U-Boot stores all clock information in Hz
		internally. For binary compatibility with older Linux
		kernels (which expect the clocks passed in the
		bd_info data to be in MHz) the environment variable
		"clocks_in_mhz" can be defined so that U-Boot
		converts clock data to MHZ before passing it to the
		Linux kernel.
		When CONFIG_CLOCKS_IN_MHZ is defined, a definition of
396
		"clocks_in_mhz=1" is automatically included in the
wdenk's avatar
wdenk committed
397
398
		default environment.

wdenk's avatar
wdenk committed
399
400
		CONFIG_MEMSIZE_IN_BYTES		[relevant for MIPS only]

401
		When transferring memsize parameter to linux, some versions
wdenk's avatar
wdenk committed
402
403
404
		expect it to be in bytes, others in MB.
		Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes.

405
		CONFIG_OF_LIBFDT
406
407

		New kernel versions are expecting firmware settings to be
408
409
410
411
412
413
		passed using flattened device trees (based on open firmware
		concepts).

		CONFIG_OF_LIBFDT
		 * New libfdt-based support
		 * Adds the "fdt" command
414
		 * The bootm command automatically updates the fdt
415

416
417
418
419
		OF_CPU - The proper name of the cpus node (only required for
			MPC512X and MPC5xxx based boards).
		OF_SOC - The proper name of the soc node (only required for
			MPC512X and MPC5xxx based boards).
420
		OF_TBCLK - The timebase frequency.
Kumar Gala's avatar
Kumar Gala committed
421
		OF_STDOUT_PATH - The path to the console device
422

423
424
		boards with QUICC Engines require OF_QE to set UCC MAC
		addresses
425

426
427
428
429
		CONFIG_OF_BOARD_SETUP

		Board code has addition modification that it wants to make
		to the flat device tree before handing it off to the kernel
430

431
432
		CONFIG_OF_BOOT_CPU

433
		This define fills in the correct boot CPU in the boot
434
435
		param header, the default value is zero if undefined.

436
437
438
439
440
441
442
443
444
		CONFIG_OF_IDE_FIXUP

		U-Boot can detect if an IDE device is present or not.
		If not, and this new config option is activated, U-Boot
		removes the ATA node from the DTS before booting Linux,
		so the Linux IDE driver does not probe the device and
		crash. This is needed for buggy hardware (uc101) where
		no pull down resistor is connected to the signal IDE5V_DD7.

445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
- vxWorks boot parameters:

		bootvx constructs a valid bootline using the following
		environments variables: bootfile, ipaddr, serverip, hostname.
		It loads the vxWorks image pointed bootfile.

		CONFIG_SYS_VXWORKS_BOOT_DEVICE - The vxworks device name
		CONFIG_SYS_VXWORKS_MAC_PTR - Ethernet 6 byte MA -address
		CONFIG_SYS_VXWORKS_SERVERNAME - Name of the server
		CONFIG_SYS_VXWORKS_BOOT_ADDR - Address of boot parameters

		CONFIG_SYS_VXWORKS_ADD_PARAMS

		Add it at the end of the bootline. E.g "u=username pw=secret"

		Note: If a "bootargs" environment is defined, it will overwride
		the defaults discussed just above.

463
464
465
466
467
- Cache Configuration:
		CONFIG_SYS_ICACHE_OFF - Do not enable instruction cache in U-Boot
		CONFIG_SYS_DCACHE_OFF - Do not enable data cache in U-Boot
		CONFIG_SYS_L2CACHE_OFF- Do not enable L2 cache in U-Boot

wdenk's avatar
wdenk committed
468
- Serial Ports:
469
		CONFIG_PL010_SERIAL
wdenk's avatar
wdenk committed
470
471
472

		Define this if you want support for Amba PrimeCell PL010 UARTs.

473
		CONFIG_PL011_SERIAL
wdenk's avatar
wdenk committed
474
475
476
477
478
479
480
481
482
483
484
485
486
487

		Define this if you want support for Amba PrimeCell PL011 UARTs.

		CONFIG_PL011_CLOCK

		If you have Amba PrimeCell PL011 UARTs, set this variable to
		the clock speed of the UARTs.

		CONFIG_PL01x_PORTS

		If you have Amba PrimeCell PL010 or PL011 UARTs on your board,
		define this to a list of base addresses for each (supported)
		port. See e.g. include/configs/versatile.h

488
489
490
491
492
493
494
495
496
497
498
499
		CONFIG_PL011_SERIAL_RLCR

		Some vendor versions of PL011 serial ports (e.g. ST-Ericsson U8500)
		have separate receive and transmit line control registers.  Set
		this variable to initialize the extra register.

		CONFIG_PL011_SERIAL_FLUSH_ON_INIT

		On some platforms (e.g. U8500) U-Boot is loaded by a second stage
		boot loader that has already initialized the UART.  Define this
		variable to flush the UART at init time.

wdenk's avatar
wdenk committed
500

wdenk's avatar
wdenk committed
501
- Console Interface:
502
503
504
505
		Depending on board, define exactly one serial port
		(like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2,
		CONFIG_8xx_CONS_SCC1, ...), or switch off the serial
		console by defining CONFIG_8xx_CONS_NONE
wdenk's avatar
wdenk committed
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522

		Note: if CONFIG_8xx_CONS_NONE is defined, the serial
		port routines must be defined elsewhere
		(i.e. serial_init(), serial_getc(), ...)

		CONFIG_CFB_CONSOLE
		Enables console device for a color framebuffer. Needs following
		defines (cf. smiLynxEM, i8042, board/eltec/bab7xx)
			VIDEO_FB_LITTLE_ENDIAN	graphic memory organisation
						(default big endian)
			VIDEO_HW_RECTFILL	graphic chip supports
						rectangle fill
						(cf. smiLynxEM)
			VIDEO_HW_BITBLT		graphic chip supports
						bit-blit (cf. smiLynxEM)
			VIDEO_VISIBLE_COLS	visible pixel columns
						(cols=pitch)
wdenk's avatar
wdenk committed
523
524
			VIDEO_VISIBLE_ROWS	visible pixel rows
			VIDEO_PIXEL_SIZE	bytes per pixel
wdenk's avatar
wdenk committed
525
526
			VIDEO_DATA_FORMAT	graphic data format
						(0-5, cf. cfb_console.c)
wdenk's avatar
wdenk committed
527
			VIDEO_FB_ADRS		framebuffer address
wdenk's avatar
wdenk committed
528
529
530
531
532
533
534
535
536
			VIDEO_KBD_INIT_FCT	keyboard int fct
						(i.e. i8042_kbd_init())
			VIDEO_TSTC_FCT		test char fct
						(i.e. i8042_tstc)
			VIDEO_GETC_FCT		get char fct
						(i.e. i8042_getc)
			CONFIG_CONSOLE_CURSOR	cursor drawing on/off
						(requires blink timer
						cf. i8042.c)
537
			CONFIG_SYS_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c)
wdenk's avatar
wdenk committed
538
539
			CONFIG_CONSOLE_TIME	display time/date info in
						upper right corner
540
						(requires CONFIG_CMD_DATE)
wdenk's avatar
wdenk committed
541
542
			CONFIG_VIDEO_LOGO	display Linux logo in
						upper left corner
543
544
545
			CONFIG_VIDEO_BMP_LOGO	use bmp_logo.h instead of
						linux_logo.h for logo.
						Requires CONFIG_VIDEO_LOGO
wdenk's avatar
wdenk committed
546
			CONFIG_CONSOLE_EXTRA_INFO
547
						additional board info beside
wdenk's avatar
wdenk committed
548
549
						the logo

550
551
552
		When CONFIG_CFB_CONSOLE is defined, video console is
		default i/o. Serial console can be forced with
		environment 'console=serial'.
wdenk's avatar
wdenk committed
553

wdenk's avatar
wdenk committed
554
555
556
557
		When CONFIG_SILENT_CONSOLE is defined, all console
		messages (by U-Boot and Linux!) can be silenced with
		the "silent" environment variable. See
		doc/README.silent for more information.
wdenk's avatar
wdenk committed
558

wdenk's avatar
wdenk committed
559
560
561
- Console Baudrate:
		CONFIG_BAUDRATE - in bps
		Select one of the baudrates listed in
562
563
		CONFIG_SYS_BAUDRATE_TABLE, see below.
		CONFIG_SYS_BRGCLK_PRESCALE, baudrate prescale
wdenk's avatar
wdenk committed
564

565
566
567
- Console Rx buffer length
		With CONFIG_SYS_SMC_RXBUFLEN it is possible to define
		the maximum receive buffer length for the SMC.
568
		This option is actual only for 82xx and 8xx possible.
569
570
571
572
		If using CONFIG_SYS_SMC_RXBUFLEN also CONFIG_SYS_MAXIDLE
		must be defined, to setup the maximum idle timeout for
		the SMC.

wdenk's avatar
wdenk committed
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
- Boot Delay:	CONFIG_BOOTDELAY - in seconds
		Delay before automatically booting the default image;
		set to -1 to disable autoboot.

		See doc/README.autoboot for these options that
		work with CONFIG_BOOTDELAY. None are required.
		CONFIG_BOOT_RETRY_TIME
		CONFIG_BOOT_RETRY_MIN
		CONFIG_AUTOBOOT_KEYED
		CONFIG_AUTOBOOT_PROMPT
		CONFIG_AUTOBOOT_DELAY_STR
		CONFIG_AUTOBOOT_STOP_STR
		CONFIG_AUTOBOOT_DELAY_STR2
		CONFIG_AUTOBOOT_STOP_STR2
		CONFIG_ZERO_BOOTDELAY_CHECK
		CONFIG_RESET_TO_RETRY

- Autoboot Command:
		CONFIG_BOOTCOMMAND
		Only needed when CONFIG_BOOTDELAY is enabled;
		define a command string that is automatically executed
		when no character is read on the console interface
		within "Boot Delay" after reset.

		CONFIG_BOOTARGS
598
599
600
		This can be used to pass arguments to the bootm
		command. The value of CONFIG_BOOTARGS goes into the
		environment value "bootargs".
wdenk's avatar
wdenk committed
601
602

		CONFIG_RAMBOOT and CONFIG_NFSBOOT
603
604
605
		The value of these goes into the environment as
		"ramboot" and "nfsboot" respectively, and can be used
		as a convenience, when switching between booting from
606
		RAM and NFS.
wdenk's avatar
wdenk committed
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632

- Pre-Boot Commands:
		CONFIG_PREBOOT

		When this option is #defined, the existence of the
		environment variable "preboot" will be checked
		immediately before starting the CONFIG_BOOTDELAY
		countdown and/or running the auto-boot command resp.
		entering interactive mode.

		This feature is especially useful when "preboot" is
		automatically generated or modified. For an example
		see the LWMON board specific code: here "preboot" is
		modified when the user holds down a certain
		combination of keys on the (special) keyboard when
		booting the systems

- Serial Download Echo Mode:
		CONFIG_LOADS_ECHO
		If defined to 1, all characters received during a
		serial download (using the "loads" command) are
		echoed back. This might be needed by some terminal
		emulations (like "cu"), but may as well just take
		time on others. This setting #define's the initial
		value of the "loads_echo" environment variable.

633
- Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined)
wdenk's avatar
wdenk committed
634
635
		CONFIG_KGDB_BAUDRATE
		Select one of the baudrates listed in
636
		CONFIG_SYS_BAUDRATE_TABLE, see below.
wdenk's avatar
wdenk committed
637
638

- Monitor Functions:
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
		Monitor commands can be included or excluded
		from the build by using the #include files
		"config_cmd_all.h" and #undef'ing unwanted
		commands, or using "config_cmd_default.h"
		and augmenting with additional #define's
		for wanted commands.

		The default command configuration includes all commands
		except those marked below with a "*".

		CONFIG_CMD_ASKENV	* ask for env variable
		CONFIG_CMD_BDI		  bdinfo
		CONFIG_CMD_BEDBUG	* Include BedBug Debugger
		CONFIG_CMD_BMP		* BMP support
		CONFIG_CMD_BSP		* Board specific commands
		CONFIG_CMD_BOOTD	  bootd
		CONFIG_CMD_CACHE	* icache, dcache
		CONFIG_CMD_CONSOLE	  coninfo
Mike Frysinger's avatar
Mike Frysinger committed
657
		CONFIG_CMD_CRC32	* crc32
658
659
660
		CONFIG_CMD_DATE		* support for RTC, date/time...
		CONFIG_CMD_DHCP		* DHCP support
		CONFIG_CMD_DIAG		* Diagnostics
661
662
663
664
		CONFIG_CMD_DS4510	* ds4510 I2C gpio commands
		CONFIG_CMD_DS4510_INFO	* ds4510 I2C info command
		CONFIG_CMD_DS4510_MEM	* ds4510 I2C eeprom/sram commansd
		CONFIG_CMD_DS4510_RST	* ds4510 I2C rst command
665
666
		CONFIG_CMD_DTT		* Digital Therm and Thermostat
		CONFIG_CMD_ECHO		  echo arguments
Peter Tyser's avatar
Peter Tyser committed
667
		CONFIG_CMD_EDITENV	  edit env variable
668
669
		CONFIG_CMD_EEPROM	* EEPROM read/write support
		CONFIG_CMD_ELF		* bootelf, bootvx
670
		CONFIG_CMD_EXPORTENV	* export the environment
671
		CONFIG_CMD_SAVEENV	  saveenv
672
673
674
675
676
		CONFIG_CMD_FDC		* Floppy Disk Support
		CONFIG_CMD_FAT		* FAT partition support
		CONFIG_CMD_FDOS		* Dos diskette Support
		CONFIG_CMD_FLASH	  flinfo, erase, protect
		CONFIG_CMD_FPGA		  FPGA device initialization support
Mike Frysinger's avatar
Mike Frysinger committed
677
		CONFIG_CMD_GO		* the 'go' command (exec code)
Kim Phillips's avatar
Kim Phillips committed
678
		CONFIG_CMD_GREPENV	* search environment
679
680
681
682
683
684
		CONFIG_CMD_HWFLOW	* RTS/CTS hw flow control
		CONFIG_CMD_I2C		* I2C serial bus support
		CONFIG_CMD_IDE		* IDE harddisk support
		CONFIG_CMD_IMI		  iminfo
		CONFIG_CMD_IMLS		  List all found images
		CONFIG_CMD_IMMAP	* IMMR dump support
685
		CONFIG_CMD_IMPORTENV	* import an environment
686
687
688
689
		CONFIG_CMD_IRQ		* irqinfo
		CONFIG_CMD_ITEST	  Integer/string test of 2 values
		CONFIG_CMD_JFFS2	* JFFS2 Support
		CONFIG_CMD_KGDB		* kgdb
690
		CONFIG_CMD_LDRINFO	  ldrinfo (display Blackfin loader)
691
692
		CONFIG_CMD_LOADB	  loadb
		CONFIG_CMD_LOADS	  loads
Robin Getz's avatar
Robin Getz committed
693
694
		CONFIG_CMD_MD5SUM	  print md5 message digest
					  (requires CONFIG_CMD_MEMORY and CONFIG_MD5)
695
696
697
698
699
		CONFIG_CMD_MEMORY	  md, mm, nm, mw, cp, cmp, crc, base,
					  loop, loopw, mtest
		CONFIG_CMD_MISC		  Misc functions like sleep etc
		CONFIG_CMD_MMC		* MMC memory mapped support
		CONFIG_CMD_MII		* MII utility commands
700
		CONFIG_CMD_MTDPARTS	* MTD partition support
701
702
		CONFIG_CMD_NAND		* NAND support
		CONFIG_CMD_NET		  bootp, tftpboot, rarpboot
703
704
		CONFIG_CMD_PCA953X	* PCA953x I2C gpio commands
		CONFIG_CMD_PCA953X_INFO	* PCA953x I2C gpio info command
705
706
707
708
709
710
711
712
713
714
715
716
717
		CONFIG_CMD_PCI		* pciinfo
		CONFIG_CMD_PCMCIA		* PCMCIA support
		CONFIG_CMD_PING		* send ICMP ECHO_REQUEST to network
					  host
		CONFIG_CMD_PORTIO	* Port I/O
		CONFIG_CMD_REGINFO	* Register dump
		CONFIG_CMD_RUN		  run command in env variable
		CONFIG_CMD_SAVES	* save S record dump
		CONFIG_CMD_SCSI		* SCSI Support
		CONFIG_CMD_SDRAM	* print SDRAM configuration information
					  (requires CONFIG_CMD_I2C)
		CONFIG_CMD_SETGETDCR	  Support for DCR Register access
					  (4xx only)
718
		CONFIG_CMD_SHA1SUM	  print sha1 memory digest
Robin Getz's avatar
Robin Getz committed
719
					  (requires CONFIG_CMD_MEMORY)
720
		CONFIG_CMD_SOURCE	  "source" command Support
721
		CONFIG_CMD_SPI		* SPI serial bus support
Luca Ceresoli's avatar
Luca Ceresoli committed
722
		CONFIG_CMD_TFTPSRV	* TFTP transfer in server mode
723
724
725
726
		CONFIG_CMD_USB		* USB support
		CONFIG_CMD_CDP		* Cisco Discover Protocol support
		CONFIG_CMD_FSL		* Microblaze FSL support

wdenk's avatar
wdenk committed
727
728
729
730

		EXAMPLE: If you want all functions except of network
		support you can write:

731
732
		#include "config_cmd_all.h"
		#undef CONFIG_CMD_NET
wdenk's avatar
wdenk committed
733

734
735
	Other Commands:
		fdt (flattened device tree) command: CONFIG_OF_LIBFDT
wdenk's avatar
wdenk committed
736
737

	Note:	Don't enable the "icache" and "dcache" commands
738
		(configuration option CONFIG_CMD_CACHE) unless you know
739
740
741
742
743
744
		what you (and your U-Boot users) are doing. Data
		cache cannot be enabled on systems like the 8xx or
		8260 (where accesses to the IMMR region must be
		uncached), and it cannot be disabled on all other
		systems where we (mis-) use the data cache to hold an
		initial stack and some data.
wdenk's avatar
wdenk committed
745
746
747
748
749
750
751


		XXX - this list needs to get updated!

- Watchdog:
		CONFIG_WATCHDOG
		If this variable is defined, it enables watchdog
752
753
754
755
756
757
758
759
760
761
762
		support for the SoC. There must be support in the SoC
		specific code for a watchdog. For the 8xx and 8260
		CPUs, the SIU Watchdog feature is enabled in the SYPCR
		register.  When supported for a specific SoC is
		available, then no further board specific code should
		be needed to use it.

		CONFIG_HW_WATCHDOG
		When using a watchdog circuitry external to the used
		SoC, then define this variable and provide board
		specific code for the "hw_watchdog_reset" function.
wdenk's avatar
wdenk committed
763

764
765
766
767
768
769
770
- U-Boot Version:
		CONFIG_VERSION_VARIABLE
		If this variable is defined, an environment variable
		named "ver" is created by U-Boot showing the U-Boot
		version as printed by the "version" command.
		This variable is readonly.

wdenk's avatar
wdenk committed
771
772
- Real-Time Clock:

773
		When CONFIG_CMD_DATE is selected, the type of the RTC
wdenk's avatar
wdenk committed
774
775
776
777
778
		has to be selected, too. Define exactly one of the
		following options:

		CONFIG_RTC_MPC8xx	- use internal RTC of MPC8xx
		CONFIG_RTC_PCF8563	- use Philips PCF8563 RTC
Guennadi Liakhovetski's avatar
Guennadi Liakhovetski committed
779
		CONFIG_RTC_MC13783	- use MC13783 RTC
wdenk's avatar
wdenk committed
780
		CONFIG_RTC_MC146818	- use MC146818 RTC
wdenk's avatar
wdenk committed
781
		CONFIG_RTC_DS1307	- use Maxim, Inc. DS1307 RTC
wdenk's avatar
wdenk committed
782
		CONFIG_RTC_DS1337	- use Maxim, Inc. DS1337 RTC
783
		CONFIG_RTC_DS1338	- use Maxim, Inc. DS1338 RTC
wdenk's avatar
wdenk committed
784
		CONFIG_RTC_DS164x	- use Dallas DS164x RTC
785
		CONFIG_RTC_ISL1208	- use Intersil ISL1208 RTC
wdenk's avatar
wdenk committed
786
		CONFIG_RTC_MAX6900	- use Maxim, Inc. MAX6900 RTC
787
		CONFIG_SYS_RTC_DS1337_NOOSC	- Turn off the OSC output for DS1337
788
789
		CONFIG_SYS_RV3029_TCR	- enable trickle charger on
					  RV3029 RTC.
wdenk's avatar
wdenk committed
790

wdenk's avatar
wdenk committed
791
792
793
		Note that if the RTC uses I2C, then the I2C interface
		must also be configured. See I2C Support, below.

794
795
796
797
- GPIO Support:
		CONFIG_PCA953X		- use NXP's PCA953X series I2C GPIO
		CONFIG_PCA953X_INFO	- enable pca953x info command

798
799
800
801
		The CONFIG_SYS_I2C_PCA953X_WIDTH option specifies a list of
		chip-ngpio pairs that tell the PCA953X driver the number of
		pins supported by a particular chip.

802
803
804
		Note that if the GPIO device uses I2C, then the I2C interface
		must also be configured. See I2C Support, below.

wdenk's avatar
wdenk committed
805
806
- Timestamp Support:

807
808
809
		When CONFIG_TIMESTAMP is selected, the timestamp
		(date and time) of an image is printed by image
		commands like bootm or iminfo. This option is
810
		automatically enabled when you select CONFIG_CMD_DATE .
wdenk's avatar
wdenk committed
811
812
813

- Partition Support:
		CONFIG_MAC_PARTITION and/or CONFIG_DOS_PARTITION
814
		and/or CONFIG_ISO_PARTITION and/or CONFIG_EFI_PARTITION
wdenk's avatar
wdenk committed
815

816
817
818
		If IDE or SCSI support is enabled (CONFIG_CMD_IDE or
		CONFIG_CMD_SCSI) you must configure support for at
		least one partition type as well.
wdenk's avatar
wdenk committed
819
820

- IDE Reset method:
wdenk's avatar
wdenk committed
821
822
		CONFIG_IDE_RESET_ROUTINE - this is defined in several
		board configurations files but used nowhere!
wdenk's avatar
wdenk committed
823

wdenk's avatar
wdenk committed
824
825
826
827
		CONFIG_IDE_RESET - is this is defined, IDE Reset will
		be performed by calling the function
			ide_set_reset(int reset)
		which has to be defined in a board specific file
wdenk's avatar
wdenk committed
828
829
830
831
832
833

- ATAPI Support:
		CONFIG_ATAPI

		Set this to enable ATAPI support.

834
835
836
837
- LBA48 Support
		CONFIG_LBA48

		Set this to enable support for disks larger than 137GB
838
		Also look at CONFIG_SYS_64BIT_LBA.
839
840
841
		Whithout these , LBA48 support uses 32bit variables and will 'only'
		support disks up to 2.1TB.

842
		CONFIG_SYS_64BIT_LBA:
843
844
845
			When enabled, makes the IDE subsystem use 64bit sector addresses.
			Default is 32bit.

wdenk's avatar
wdenk committed
846
847
848
849
850
- SCSI Support:
		At the moment only there is only support for the
		SYM53C8XX SCSI controller; define
		CONFIG_SCSI_SYM53C8XX to enable it.

851
852
853
		CONFIG_SYS_SCSI_MAX_LUN [8], CONFIG_SYS_SCSI_MAX_SCSI_ID [7] and
		CONFIG_SYS_SCSI_MAX_DEVICE [CONFIG_SYS_SCSI_MAX_SCSI_ID *
		CONFIG_SYS_SCSI_MAX_LUN] can be adjusted to define the
wdenk's avatar
wdenk committed
854
855
		maximum numbers of LUNs, SCSI ID's and target
		devices.
856
		CONFIG_SYS_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz)
wdenk's avatar
wdenk committed
857
858

- NETWORK Support (PCI):
859
860
		CONFIG_E1000
		Support for Intel 8254x gigabit chips.
stroese's avatar
stroese committed
861

Andre Schwarz's avatar
Andre Schwarz committed
862
		CONFIG_E1000_FALLBACK_MAC
863
		default MAC for empty EEPROM after production.
Andre Schwarz's avatar
Andre Schwarz committed
864

wdenk's avatar
wdenk committed
865
866
		CONFIG_EEPRO100
		Support for Intel 82557/82559/82559ER chips.
867
		Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM
wdenk's avatar
wdenk committed
868
869
870
871
872
873
874
875
876
877
878
879
880
		write routine for first time initialisation.

		CONFIG_TULIP
		Support for Digital 2114x chips.
		Optional CONFIG_TULIP_SELECT_MEDIA for board specific
		modem chip initialisation (KS8761/QS6611).

		CONFIG_NATSEMI
		Support for National dp83815 chips.

		CONFIG_NS8382X
		Support for National dp8382[01] gigabit chips.

wdenk's avatar
wdenk committed
881
882
- NETWORK Support (other):

883
884
885
886
887
888
889
890
891
892
		CONFIG_DRIVER_AT91EMAC
		Support for AT91RM9200 EMAC.

			CONFIG_RMII
			Define this to use reduced MII inteface

			CONFIG_DRIVER_AT91EMAC_QUIET
			If this defined, the driver is quiet.
			The driver doen't show link status messages.

wdenk's avatar
wdenk committed
893
894
895
896
897
898
899
900
901
902
		CONFIG_DRIVER_LAN91C96
		Support for SMSC's LAN91C96 chips.

			CONFIG_LAN91C96_BASE
			Define this to hold the physical address
			of the LAN91C96's I/O space

			CONFIG_LAN91C96_USE_32_BIT
			Define this to enable 32 bit addressing

wdenk's avatar
wdenk committed
903
904
905
906
907
908
909
910
911
912
913
914
915
916
		CONFIG_DRIVER_SMC91111
		Support for SMSC's LAN91C111 chip

			CONFIG_SMC91111_BASE
			Define this to hold the physical address
			of the device (I/O space)

			CONFIG_SMC_USE_32_BIT
			Define this if data bus is 32 bits

			CONFIG_SMC_USE_IOFUNCS
			Define this to use i/o functions instead of macros
			(some hardware wont work with macros)

917
918
919
920
921
922
923
924
925
926
927
928
		CONFIG_FTGMAC100
		Support for Faraday's FTGMAC100 Gigabit SoC Ethernet

			CONFIG_FTGMAC100_EGIGA
			Define this to use GE link update with gigabit PHY.
			Define this if FTGMAC100 is connected to gigabit PHY.
			If your system has 10/100 PHY only, it might not occur
			wrong behavior. Because PHY usually return timeout or
			useless data when polling gigabit status and gigabit
			control registers. This behavior won't affect the
			correctnessof 10/100 link speed update.

929
		CONFIG_SMC911X
Jens Gehrlein's avatar
Jens Gehrlein committed
930
931
		Support for SMSC's LAN911x and LAN921x chips

932
			CONFIG_SMC911X_BASE
Jens Gehrlein's avatar
Jens Gehrlein committed
933
934
935
			Define this to hold the physical address
			of the device (I/O space)

936
			CONFIG_SMC911X_32_BIT
Jens Gehrlein's avatar
Jens Gehrlein committed
937
938
			Define this if data bus is 32 bits

939
			CONFIG_SMC911X_16_BIT
Jens Gehrlein's avatar
Jens Gehrlein committed
940
941
			Define this if data bus is 16 bits. If your processor
			automatically converts one 32 bit word to two 16 bit
942
			words you may also try CONFIG_SMC911X_32_BIT.
Jens Gehrlein's avatar
Jens Gehrlein committed
943

944
945
946
947
948
949
950
951
952
		CONFIG_SH_ETHER
		Support for Renesas on-chip Ethernet controller

			CONFIG_SH_ETHER_USE_PORT
			Define the number of ports to be used

			CONFIG_SH_ETHER_PHY_ADDR
			Define the ETH PHY's address

953
954
955
			CONFIG_SH_ETHER_CACHE_WRITEBACK
			If this option is set, the driver enables cache flush.

wdenk's avatar
wdenk committed
956
957
- USB Support:
		At the moment only the UHCI host controller is
wdenk's avatar
wdenk committed
958
		supported (PIP405, MIP405, MPC5200); define
wdenk's avatar
wdenk committed
959
960
		CONFIG_USB_UHCI to enable it.
		define CONFIG_USB_KEYBOARD to enable the USB Keyboard
wdenk's avatar
wdenk committed
961
		and define CONFIG_USB_STORAGE to enable the USB
wdenk's avatar
wdenk committed
962
963
964
965
		storage devices.
		Note:
		Supported are USB Keyboards and USB Floppy drives
		(TEAC FD-05PUB).
wdenk's avatar
wdenk committed
966
967
968
		MPC5200 USB requires additional defines:
			CONFIG_USB_CLOCK
				for 528 MHz Clock: 0x0001bbbb
969
970
			CONFIG_PSC3_USB
				for USB on PSC3
wdenk's avatar
wdenk committed
971
972
973
			CONFIG_USB_CONFIG
				for differential drivers: 0x00001000
				for single ended drivers: 0x00005000
974
975
				for differential drivers on PSC3: 0x00000100
				for single ended drivers on PSC3: 0x00004100
976
			CONFIG_SYS_USB_EVENT_POLL
Zhang Wei's avatar
Zhang Wei committed
977
978
				May be defined to allow interrupt polling
				instead of using asynchronous interrupts
wdenk's avatar
wdenk committed
979

Wolfgang Denk's avatar
Wolfgang Denk committed
980
981
982
983
- USB Device:
		Define the below if you wish to use the USB console.
		Once firmware is rebuilt from a serial console issue the
		command "setenv stdin usbtty; setenv stdout usbtty" and
984
		attach your USB cable. The Unix command "dmesg" should print
Wolfgang Denk's avatar
Wolfgang Denk committed
985
986
		it has found a new device. The environment variable usbtty
		can be set to gserial or cdc_acm to enable your device to
Wolfgang Denk's avatar
Wolfgang Denk committed
987
		appear to a USB host as a Linux gserial device or a
Wolfgang Denk's avatar
Wolfgang Denk committed
988
989
990
991
992
993
994
		Common Device Class Abstract Control Model serial device.
		If you select usbtty = gserial you should be able to enumerate
		a Linux host by
		# modprobe usbserial vendor=0xVendorID product=0xProductID
		else if using cdc_acm, simply setting the environment
		variable usbtty to be cdc_acm should suffice. The following
		might be defined in YourBoardName.h
Wolfgang Denk's avatar
Wolfgang Denk committed
995

Wolfgang Denk's avatar
Wolfgang Denk committed
996
997
998
999
1000
1001
			CONFIG_USB_DEVICE
			Define this to build a UDC device

			CONFIG_USB_TTY
			Define this to have a tty type of device available to
			talk to the UDC device
Wolfgang Denk's avatar
Wolfgang Denk committed
1002

1003
			CONFIG_SYS_CONSOLE_IS_IN_ENV
Wolfgang Denk's avatar
Wolfgang Denk committed
1004
1005
1006
1007
			Define this if you want stdin, stdout &/or stderr to
			be set to usbtty.

			mpc8xx:
1008
				CONFIG_SYS_USB_EXTC_CLK 0xBLAH
Wolfgang Denk's avatar
Wolfgang Denk committed
1009
				Derive USB clock from external clock "blah"
1010
				- CONFIG_SYS_USB_EXTC_CLK 0x02
Wolfgang Denk's avatar
Wolfgang Denk committed
1011

1012
				CONFIG_SYS_USB_BRG_CLK 0xBLAH
Wolfgang Denk's avatar
Wolfgang Denk committed
1013
				Derive USB clock from brgclk
1014
				- CONFIG_SYS_USB_BRG_CLK 0x04
Wolfgang Denk's avatar
Wolfgang Denk committed
1015

Wolfgang Denk's avatar
Wolfgang Denk committed
1016
		If you have a USB-IF assigned VendorID then you may wish to
Wolfgang Denk's avatar
Wolfgang Denk committed
1017
		define your own vendor specific values either in BoardName.h
Wolfgang Denk's avatar
Wolfgang Denk committed
1018
		or directly in usbd_vendor_info.h. If you don't define
Wolfgang Denk's avatar
Wolfgang Denk committed
1019
1020
1021
1022
1023
1024
1025
		CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME,
		CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot
		should pretend to be a Linux device to it's target host.

			CONFIG_USBD_MANUFACTURER
			Define this string as the name of your company for
			- CONFIG_USBD_MANUFACTURER "my company"
Wolfgang Denk's avatar
Wolfgang Denk committed
1026

Wolfgang Denk's avatar
Wolfgang Denk committed
1027
1028
1029
1030
1031
1032
1033
1034
1035
			CONFIG_USBD_PRODUCT_NAME
			Define this string as the name of your product
			- CONFIG_USBD_PRODUCT_NAME "acme usb device"

			CONFIG_USBD_VENDORID
			Define this as your assigned Vendor ID from the USB
			Implementors Forum. This *must* be a genuine Vendor ID
			to avoid polluting the USB namespace.
			- CONFIG_USBD_VENDORID 0xFFFF
Wolfgang Denk's avatar
Wolfgang Denk committed
1036

Wolfgang Denk's avatar
Wolfgang Denk committed
1037
1038
1039
1040
			CONFIG_USBD_PRODUCTID
			Define this as the unique Product ID
			for your device
			- CONFIG_USBD_PRODUCTID 0xFFFF
wdenk's avatar
wdenk committed
1041

wdenk's avatar
wdenk committed
1042

1043
- MMC Support:
wdenk's avatar
wdenk committed
1044
1045
1046
		The MMC controller on the Intel PXA is supported. To
		enable this define CONFIG_MMC. The MMC can be
		accessed from the boot prompt by mapping the device
1047
		to physical memory similar to flash. Command line is
1048
1049
		enabled with CONFIG_CMD_MMC. The MMC driver also works with
		the FAT fs. This is enabled with CONFIG_CMD_FAT.
1050

wdenk's avatar
wdenk committed
1051
1052
1053
1054
1055
- Journaling Flash filesystem support:
		CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE,
		CONFIG_JFFS2_NAND_DEV
		Define these for a default partition on a NAND device

1056
1057
		CONFIG_SYS_JFFS2_FIRST_SECTOR,
		CONFIG_SYS_JFFS2_FIRST_BANK, CONFIG_SYS_JFFS2_NUM_BANKS
wdenk's avatar
wdenk committed
1058
1059
		Define these for a default partition on a NOR device

1060
		CONFIG_SYS_JFFS_CUSTOM_PART
wdenk's avatar
wdenk committed
1061
1062
1063
1064
		Define this to create an own partition. You have to provide a
		function struct part_info* jffs2_part_info(int part_num)

		If you define only one JFFS2 partition you may also want to
1065
		#define CONFIG_SYS_JFFS_SINGLE_PART	1
wdenk's avatar
wdenk committed
1066
1067
1068
		to disable the command chpart. This is the default when you
		have not defined a custom partition

wdenk's avatar
wdenk committed
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
- Keyboard Support:
		CONFIG_ISA_KEYBOARD

		Define this to enable standard (PC-Style) keyboard
		support

		CONFIG_I8042_KBD
		Standard PC keyboard driver with US (is default) and
		GERMAN key layout (switch via environment 'keymap=de') support.
		Export function i8042_kbd_init, i8042_tstc and i8042_getc
		for cfb_console. Supports cursor blinking.

- Video support:
		CONFIG_VIDEO

		Define this to enable video support (for output to
		video).

		CONFIG_VIDEO_CT69000

		Enable Chips & Technologies 69000 Video chip

		CONFIG_VIDEO_SMI_LYNXEM
wdenk's avatar
wdenk committed
1092
		Enable Silicon Motion SMI 712/710/810 Video chip. The
wdenk's avatar
wdenk committed
1093
1094
1095
1096
		video output is selected via environment 'videoout'
		(1 = LCD and 2 = CRT). If videoout is undefined, CRT is
		assumed.

wdenk's avatar
wdenk committed
1097
		For the CT69000 and SMI_LYNXEM drivers, videomode is
1098
		selected via environment 'videomode'. Two different ways
wdenk's avatar
wdenk committed
1099
1100
		are possible:
		- "videomode=num"   'num' is a standard LiLo mode numbers.
wdenk's avatar
wdenk committed
1101
		Following standard modes are supported	(* is default):
wdenk's avatar
wdenk committed
1102
1103
1104
1105
1106
1107
1108
1109

		      Colors	640x480 800x600 1024x768 1152x864 1280x1024
		-------------+---------------------------------------------
		      8 bits |	0x301*	0x303	 0x305	  0x161	    0x307
		     15 bits |	0x310	0x313	 0x316	  0x162	    0x319
		     16 bits |	0x311	0x314	 0x317	  0x163	    0x31A
		     24 bits |	0x312	0x315	 0x318	    ?	    0x31B
		-------------+---------------------------------------------
wdenk's avatar
wdenk committed
1110
1111
		(i.e. setenv videomode 317; saveenv; reset;)

wdenk's avatar
wdenk committed
1112
		- "videomode=bootargs" all the video parameters are parsed
1113
		from the bootargs. (See drivers/video/videomodes.c)
wdenk's avatar
wdenk committed
1114
1115


1116
		CONFIG_VIDEO_SED13806
1117
		Enable Epson SED13806 driver. This driver supports 8bpp
1118
1119
1120
		and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP
		or CONFIG_VIDEO_SED13806_16BPP

1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
		CONFIG_FSL_DIU_FB
		Enable the Freescale DIU video driver.  Reference boards for
		SOCs that have a DIU should define this macro to enable DIU
		support, and should also define these other macros:

			CONFIG_SYS_DIU_ADDR
			CONFIG_VIDEO
			CONFIG_CMD_BMP
			CONFIG_CFB_CONSOLE
			CONFIG_VIDEO_SW_CURSOR
			CONFIG_VGA_AS_SINGLE_DEVICE
			CONFIG_VIDEO_LOGO
			CONFIG_VIDEO_BMP_LOGO

1135
1136
1137
1138
		The DIU driver will look for the 'video-mode' environment
		variable, and if defined, enable the DIU as a console during
		boot.  See the documentation file README.video for a
		description of this variable.
1139

1140
- Keyboard Support:
wdenk's avatar
wdenk committed
1141
		CONFIG_KEYBOARD
1142

wdenk's avatar
wdenk committed
1143
1144
1145
1146
		Define this to enable a custom keyboard support.
		This simply calls drv_keyboard_init() which must be
		defined in your board-specific files.
		The only board using this so far is RBC823.
1147

wdenk's avatar
wdenk committed
1148
1149
1150
1151
1152
1153
- LCD Support:	CONFIG_LCD

		Define this to enable LCD support (for output to LCD
		display); also select one of the supported displays
		by defining one of these:

Stelian Pop's avatar
Stelian Pop committed
1154
1155
1156
1157
		CONFIG_ATMEL_LCD:

			HITACHI TX09D70VM1CCA, 3.5", 240x320.

wdenk's avatar
wdenk committed
1158
		CONFIG_NEC_NL6448AC33:
wdenk's avatar
wdenk committed
1159

wdenk's avatar
wdenk committed
1160
			NEC NL6448AC33-18. Active, color, single scan.
wdenk's avatar
wdenk committed
1161

wdenk's avatar
wdenk committed
1162
		CONFIG_NEC_NL6448BC20
wdenk's avatar
wdenk committed
1163

wdenk's avatar
wdenk committed
1164
1165
1166
1167
1168
1169
			NEC NL6448BC20-08. 6.5", 640x480.
			Active, color, single scan.

		CONFIG_NEC_NL6448BC33_54

			NEC NL6448BC33-54. 10.4", 640x480.
wdenk's avatar
wdenk committed
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
			Active, color, single scan.

		CONFIG_SHARP_16x9

			Sharp 320x240. Active, color, single scan.
			It isn't 16x9, and I am not sure what it is.

		CONFIG_SHARP_LQ64D341

			Sharp LQ64D341 display, 640x480.
			Active, color, single scan.

		CONFIG_HLD1045

			HLD1045 display, 640x480.
			Active, color, single scan.

		CONFIG_OPTREX_BW

			Optrex	 CBL50840-2 NF-FW 99 22 M5
			or
			Hitachi	 LMG6912RPFC-00T
			or
			Hitachi	 SP14Q002

			320x240. Black & white.

		Normally display is black on white background; define
1198
		CONFIG_SYS_WHITE_ON_BLACK to get it inverted.
wdenk's avatar
wdenk committed
1199

wdenk's avatar
wdenk committed
1200
- Splash Screen Support: CONFIG_SPLASH_SCREEN
1201

wdenk's avatar
wdenk committed
1202
1203
1204
		If this option is set, the environment is checked for
		a variable "splashimage". If found, the usual display
		of logo, copyright and system information on the LCD
1205
		is suppressed and the BMP image at the address
wdenk's avatar
wdenk committed
1206
1207
1208
1209
		specified in "splashimage" is loaded instead. The
		console is redirected to the "nulldev", too. This
		allows for a "silent" boot where a splash screen is
		loaded very quickly after power-on.
1210

1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
		CONFIG_SPLASH_SCREEN_ALIGN

		If this option is set the splash image can be freely positioned
		on the screen. Environment variable "splashpos" specifies the
		position as "x,y". If a positive number is given it is used as
		number of pixel from left/top. If a negative number is given it
		is used as number of pixel from right/bottom. You can also
		specify 'm' for centering the image.

		Example:
		setenv splashpos m,m
			=> image at center of screen

		setenv splashpos 30,20
			=> image at x = 30 and y = 20

		setenv splashpos -10,m
			=> vertically centered image
			   at x = dspWidth - bmpWidth - 9

1231
1232
1233
1234
1235
1236
- Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP

		If this option is set, additionally to standard BMP
		images, gzipped BMP images can be displayed via the
		splashscreen support or the bmp command.

1237
1238
1239
1240
1241
1242
- Run length encoded BMP image (RLE8) support: CONFIG_VIDEO_BMP_RLE8

		If this option is set, 8-bit RLE compressed BMP images
		can be displayed via the splashscreen support or the
		bmp command.

wdenk's avatar
wdenk committed
1243
1244
1245
1246
1247
1248
1249
- Compression support:
		CONFIG_BZIP2

		If this option is set, support for bzip2 compressed
		images is included. If not, only uncompressed and gzip
		compressed images are supported.

1250
		NOTE: the bzip2 algorithm requires a lot of RAM, so
1251
		the malloc area (as defined by CONFIG_SYS_MALLOC_LEN) should
1252
		be at least 4MB.
1253

1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
		CONFIG_LZMA

		If this option is set, support for lzma compressed
		images is included.

		Note: The LZMA algorithm adds between 2 and 4KB of code and it
		requires an amount of dynamic memory that is given by the
		formula:

			(1846 + 768 << (lc + lp)) * sizeof(uint16)

		Where lc and lp stand for, respectively, Literal context bits
		and Literal pos bits.

		This value is upper-bounded by 14MB in the worst case. Anyway,
		for a ~4MB large kernel image, we have lc=3 and lp=0 for a
		total amount of (1846 + 768 << (3 + 0)) * 2 = ~41KB... that is
		a very small buffer.

		Use the lzmainfo tool to determinate the lc and lp values and
		then calculate the amount of needed dynamic memory (ensuring
1275
		the appropriate CONFIG_SYS_MALLOC_LEN value).
1276

wdenk's avatar
wdenk committed
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
- MII/PHY support:
		CONFIG_PHY_ADDR

		The address of PHY on MII bus.

		CONFIG_PHY_CLOCK_FREQ (ppc4xx)

		The clock frequency of the MII bus

		CONFIG_PHY_GIGE

		If this option is set, support for speed/duplex
1289
		detection of gigabit PHY is included.
wdenk's avatar
wdenk committed
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302

		CONFIG_PHY_RESET_DELAY

		Some PHY like Intel LXT971A need extra delay after
		reset before any MII register access is possible.
		For such PHY, set this option to the usec delay
		required. (minimum 300usec for LXT971A)

		CONFIG_PHY_CMD_DELAY (ppc4xx)

		Some PHY like Intel LXT971A need extra delay after
		command issued before MII status register can be read

wdenk's avatar
wdenk committed
1303
1304
- Ethernet address:
		CONFIG_ETHADDR
1305
		CONFIG_ETH1ADDR
wdenk's avatar
wdenk committed
1306
1307
		CONFIG_ETH2ADDR
		CONFIG_ETH3ADDR
1308
1309
		CONFIG_ETH4ADDR
		CONFIG_ETH5ADDR
wdenk's avatar
wdenk committed
1310

1311
1312
		Define a default value for Ethernet address to use
		for the respective Ethernet interface, in case this
wdenk's avatar
wdenk committed
1313
1314
1315
1316
1317
1318
		is not determined automatically.

- IP address:
		CONFIG_IPADDR

		Define a default value for the IP address to use for
1319
		the default Ethernet interface, in case this is not
wdenk's avatar
wdenk committed
1320
1321
1322
1323
1324
		determined through e.g. bootp.

- Server IP address:
		CONFIG_SERVERIP

1325
		Defines a default value for the IP address of a TFTP
wdenk's avatar
wdenk committed
1326
1327
		server to contact when using the "tftboot" command.

1328
1329
1330
1331
1332
		CONFIG_KEEP_SERVERADDR

		Keeps the server's MAC address, in the env 'serveraddr'
		for passing to bootargs (like Linux's netconsole option)

David Updegraff's avatar
David Updegraff committed
1333
1334
1335
1336
1337
- Multicast TFTP Mode:
		CONFIG_MCAST_TFTP

		Defines whether you want to support multicast TFTP as per
		rfc-2090; for example to work with atftp.  Lets lots of targets
1338
		tftp down the same boot image concurrently.  Note: the Ethernet
David Updegraff's avatar
David Updegraff committed
1339
1340
1341
		driver in use must provide a function: mcast() to join/leave a
		multicast group.

wdenk's avatar
wdenk committed
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
- BOOTP Recovery Mode:
		CONFIG_BOOTP_RANDOM_DELAY

		If you have many targets in a network that try to
		boot using BOOTP, you may want to avoid that all
		systems send out BOOTP requests at precisely the same
		moment (which would happen for instance at recovery
		from a power failure, when all systems will try to
		boot, thus flooding the BOOTP server. Defining
		CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be
		inserted before sending out BOOTP requests. The
1353
		following delays are inserted then:
wdenk's avatar
wdenk committed
1354
1355
1356
1357
1358
1359
1360

		1st BOOTP request:	delay 0 ... 1 sec
		2nd BOOTP request:	delay 0 ... 2 sec
		3rd BOOTP request:	delay 0 ... 4 sec
		4th and following
		BOOTP requests:		delay 0 ... 8 sec

1361
- DHCP Advanced Options:
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
		You can fine tune the DHCP functionality by defining
		CONFIG_BOOTP_* symbols:

		CONFIG_BOOTP_SUBNETMASK
		CONFIG_BOOTP_GATEWAY
		CONFIG_BOOTP_HOSTNAME
		CONFIG_BOOTP_NISDOMAIN
		CONFIG_BOOTP_BOOTPATH
		CONFIG_BOOTP_BOOTFILESIZE
		CONFIG_BOOTP_DNS
		CONFIG_BOOTP_DNS2
		CONFIG_BOOTP_SEND_HOSTNAME
		CONFIG_BOOTP_NTPSERVER
		CONFIG_BOOTP_TIMEOFFSET
		CONFIG_BOOTP_VENDOREX
1377

1378
1379
		CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip
		environment variable, not the BOOTP server.
1380
1381
1382
1383
1384
1385
1386
1387

		CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS
		serverip from a DHCP server, it is possible that more
		than one DNS serverip is offered to the client.
		If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS
		serverip will be stored in the additional environment
		variable "dnsip2". The first DNS serverip is always
		stored in the variable "dnsip", when CONFIG_BOOTP_DNS
1388
		is defined.
1389
1390
1391
1392

		CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable
		to do a dynamic update of a DNS server. To do this, they
		need the hostname of the DHCP requester.
1393
		If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content
1394
1395
		of the "hostname" environment variable is passed as
		option 12 to the DHCP server.
1396

1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
		CONFIG_BOOTP_DHCP_REQUEST_DELAY

		A 32bit value in microseconds for a delay between
		receiving a "DHCP Offer" and sending the "DHCP Request".
		This fixes a problem with certain DHCP servers that don't
		respond 100% of the time to a "DHCP request". E.g. On an
		AT91RM9200 processor running at 180MHz, this delay needed
		to be *at least* 15,000 usec before a Windows Server 2003
		DHCP server would reply 100% of the time. I recommend at
		least 50,000 usec to be safe. The alternative is to hope
		that one of the retries will be successful but note that
		the DHCP timeout and retry process takes a longer than
		this delay.

1411
 - CDP Options:
wdenk's avatar
wdenk committed
1412
		CONFIG_CDP_DEVICE_ID
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424

		The device id used in CDP trigger frames.

		CONFIG_CDP_DEVICE_ID_PREFIX

		A two character string which is prefixed to the MAC address
		of the device.

		CONFIG_CDP_PORT_ID

		A printf format string which contains the ascii name of
		the port. Normally is set to "eth%d" which sets
1425
		eth0 for the first Ethernet, eth1 for the second etc.
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452

		CONFIG_CDP_CAPABILITIES

		A 32bit integer which indicates the device capabilities;
		0x00000010 for a normal host which does not forwards.

		CONFIG_CDP_VERSION

		An ascii string containing the version of the software.

		CONFIG_CDP_PLATFORM

		An ascii string containing the name of the platform.

		CONFIG_CDP_TRIGGER

		A 32bit integer sent on the trigger.

		CONFIG_CDP_POWER_CONSUMPTION

		A 16bit integer containing the power consumption of the
		device in .1 of milliwatts.

		CONFIG_CDP_APPLIANCE_VLAN_TYPE

		A byte containing the id of the VLAN.

wdenk's avatar
wdenk committed
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
- Status LED:	CONFIG_STATUS_LED

		Several configurations allow to display the current
		status using a LED. For instance, the LED will blink
		fast while running U-Boot code, stop blinking as
		soon as a reply to a BOOTP request was received, and
		start blinking slow once the Linux kernel is running
		(supported by a status LED driver in the Linux
		kernel). Defining CONFIG_STATUS_LED enables this
		feature in U-Boot.

- CAN Support:	CONFIG_CAN_DRIVER

		Defining CONFIG_CAN_DRIVER enables CAN driver support
		on those systems that support this (optional)
		feature, like the TQM8xxL modules.

- I2C Support:	CONFIG_HARD_I2C | CONFIG_SOFT_I2C

wdenk's avatar
wdenk committed
1472
		These enable I2C serial bus commands. Defining either of
1473
		(but not both of) CONFIG_HARD_I2C or CONFIG_SOFT_I2C will
1474
		include the appropriate I2C driver for the selected CPU.
wdenk's avatar
wdenk committed
1475

1476
		This will allow you to use i2c commands at the u-boot
1477
		command line (as long as you set CONFIG_CMD_I2C in
wdenk's avatar
wdenk committed
1478
1479
		CONFIG_COMMANDS) and communicate with i2c based realtime
		clock chips. See common/cmd_i2c.c for a description of the
1480
		command line interface.
wdenk's avatar
wdenk committed
1481

1482
		CONFIG_HARD_I2C selects a hardware I2C controller.
wdenk's avatar
wdenk committed
1483

1484
		CONFIG_SOFT_I2C configures u-boot to use a software (aka
wdenk's avatar
wdenk committed
1485
1486
		bit-banging) driver instead of CPM or similar hardware
		support for I2C.
wdenk's avatar
wdenk committed
1487

1488
		There are several other quantities that must also be
wdenk's avatar
wdenk committed
1489
		defined when you define CONFIG_HARD_I2C or CONFIG_SOFT_I2C.
wdenk's avatar
wdenk committed
1490

1491
		In both cases you will need to define CONFIG_SYS_I2C_SPEED
1492
		to be the frequency (in Hz) at which you wish your i2c bus
1493
		to run and CONFIG_SYS_I2C_SLAVE to be the address of this node (ie
1494
		the CPU's i2c node address).
1495

1496
		Now, the u-boot i2c code for the mpc8xx
Stefan Roese's avatar
Stefan Roese committed
1497
		(arch/powerpc/cpu/mpc8xx/i2c.c) sets the CPU up as a master node
1498
1499
1500
		and so its address should therefore be cleared to 0 (See,
		eg, MPC823e User's Manual p.16-473). So, set
		CONFIG_SYS_I2C_SLAVE to 0.
wdenk's avatar
wdenk committed
1501

1502
1503
1504
1505
1506
1507
1508
		CONFIG_SYS_I2C_INIT_MPC5XXX

		When a board is reset during an i2c bus transfer
		chips might think that the current transfer is still
		in progress.  Reset the slave devices by sending start
		commands until the slave device responds.

1509
		That's all that's required for CONFIG_HARD_I2C.
wdenk's avatar
wdenk committed
1510

wdenk's avatar
wdenk committed
1511
1512
1513
		If you use the software i2c interface (CONFIG_SOFT_I2C)
		then the following macros need to be defined (examples are
		from include/configs/lwmon.h):
wdenk's avatar
wdenk committed
1514
1515
1516

		I2C_INIT

wdenk's avatar
wdenk committed
1517
		(Optional). Any commands necessary to enable the I2C
1518
		controller or configure ports.