xref: /openbmc/u-boot/README (revision 046a37bd53f479915bcd5041e0834dad576371a2)
1c609719bSwdenk#
26abe6fb6SDetlev Zundel# (C) Copyright 2000 - 2011
3c609719bSwdenk# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4c609719bSwdenk#
5c609719bSwdenk# See file CREDITS for list of people who contributed to this
6c609719bSwdenk# project.
7c609719bSwdenk#
8c609719bSwdenk# This program is free software; you can redistribute it and/or
9c609719bSwdenk# modify it under the terms of the GNU General Public License as
10c609719bSwdenk# published by the Free Software Foundation; either version 2 of
11c609719bSwdenk# the License, or (at your option) any later version.
12c609719bSwdenk#
13c609719bSwdenk# This program is distributed in the hope that it will be useful,
14c609719bSwdenk# but WITHOUT ANY WARRANTY; without even the implied warranty of
15c609719bSwdenk# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	See the
16c609719bSwdenk# GNU General Public License for more details.
17c609719bSwdenk#
18c609719bSwdenk# You should have received a copy of the GNU General Public License
19c609719bSwdenk# along with this program; if not, write to the Free Software
20c609719bSwdenk# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21c609719bSwdenk# MA 02111-1307 USA
22c609719bSwdenk#
23c609719bSwdenk
24c609719bSwdenkSummary:
25c609719bSwdenk========
26c609719bSwdenk
2724ee89b9SwdenkThis directory contains the source code for U-Boot, a boot loader for
28e86e5a07SwdenkEmbedded boards based on PowerPC, ARM, MIPS and several other
29e86e5a07Swdenkprocessors, which can be installed in a boot ROM and used to
30e86e5a07Swdenkinitialize and test the hardware or to download and run application
31e86e5a07Swdenkcode.
32c609719bSwdenk
33c609719bSwdenkThe development of U-Boot is closely related to Linux: some parts of
3424ee89b9Swdenkthe source code originate in the Linux source tree, we have some
3524ee89b9Swdenkheader files in common, and special provision has been made to
36c609719bSwdenksupport booting of Linux images.
37c609719bSwdenk
38c609719bSwdenkSome attention has been paid to make this software easily
39c609719bSwdenkconfigurable and extendable. For instance, all monitor commands are
40c609719bSwdenkimplemented with the same call interface, so that it's very easy to
41c609719bSwdenkadd new commands. Also, instead of permanently adding rarely used
42c609719bSwdenkcode (for instance hardware test utilities) to the monitor, you can
43c609719bSwdenkload and run it dynamically.
44c609719bSwdenk
45c609719bSwdenk
46c609719bSwdenkStatus:
47c609719bSwdenk=======
48c609719bSwdenk
49c609719bSwdenkIn general, all boards for which a configuration option exists in the
50c609719bSwdenkMakefile have been tested to some extent and can be considered
51c609719bSwdenk"working". In fact, many of them are used in production systems.
52c609719bSwdenk
53c609719bSwdenkIn case of problems see the CHANGELOG and CREDITS files to find out
54218ca724SWolfgang Denkwho contributed the specific port. The MAINTAINERS file lists board
55218ca724SWolfgang Denkmaintainers.
56c609719bSwdenk
57c609719bSwdenk
58c609719bSwdenkWhere to get help:
59c609719bSwdenk==================
60c609719bSwdenk
61c609719bSwdenkIn case you have questions about, problems with or contributions for
62c609719bSwdenkU-Boot you should send a message to the U-Boot mailing list at
630c32565fSPeter Tyser<u-boot@lists.denx.de>. There is also an archive of previous traffic
640c32565fSPeter Tyseron the mailing list - please search the archive before asking FAQ's.
650c32565fSPeter TyserPlease see http://lists.denx.de/pipermail/u-boot and
660c32565fSPeter Tyserhttp://dir.gmane.org/gmane.comp.boot-loaders.u-boot
67c609719bSwdenk
68c609719bSwdenk
69218ca724SWolfgang DenkWhere to get source code:
70218ca724SWolfgang Denk=========================
71218ca724SWolfgang Denk
72218ca724SWolfgang DenkThe U-Boot source code is maintained in the git repository at
73218ca724SWolfgang Denkgit://www.denx.de/git/u-boot.git ; you can browse it online at
74218ca724SWolfgang Denkhttp://www.denx.de/cgi-bin/gitweb.cgi?p=u-boot.git;a=summary
75218ca724SWolfgang Denk
76218ca724SWolfgang DenkThe "snapshot" links on this page allow you to download tarballs of
7711ccc33fSMarcel Ziswilerany version you might be interested in. Official releases are also
78218ca724SWolfgang Denkavailable for FTP download from the ftp://ftp.denx.de/pub/u-boot/
79218ca724SWolfgang Denkdirectory.
80218ca724SWolfgang Denk
81d4ee711dSAnatolij GustschinPre-built (and tested) images are available from
82218ca724SWolfgang Denkftp://ftp.denx.de/pub/u-boot/images/
83218ca724SWolfgang Denk
84218ca724SWolfgang Denk
85c609719bSwdenkWhere we come from:
86c609719bSwdenk===================
87c609719bSwdenk
88c609719bSwdenk- start from 8xxrom sources
8924ee89b9Swdenk- create PPCBoot project (http://sourceforge.net/projects/ppcboot)
90c609719bSwdenk- clean up code
91c609719bSwdenk- make it easier to add custom boards
92c609719bSwdenk- make it possible to add other [PowerPC] CPUs
93c609719bSwdenk- extend functions, especially:
94c609719bSwdenk  * Provide extended interface to Linux boot loader
95c609719bSwdenk  * S-Record download
96c609719bSwdenk  * network boot
9711ccc33fSMarcel Ziswiler  * PCMCIA / CompactFlash / ATA disk / SCSI ... boot
9824ee89b9Swdenk- create ARMBoot project (http://sourceforge.net/projects/armboot)
99c609719bSwdenk- add other CPU families (starting with ARM)
10024ee89b9Swdenk- create U-Boot project (http://sourceforge.net/projects/u-boot)
1010d28f34bSMagnus Lilja- current project page: see http://www.denx.de/wiki/U-Boot
10224ee89b9Swdenk
10324ee89b9Swdenk
10424ee89b9SwdenkNames and Spelling:
10524ee89b9Swdenk===================
10624ee89b9Swdenk
10724ee89b9SwdenkThe "official" name of this project is "Das U-Boot". The spelling
10824ee89b9Swdenk"U-Boot" shall be used in all written text (documentation, comments
10924ee89b9Swdenkin source files etc.). Example:
11024ee89b9Swdenk
11124ee89b9Swdenk	This is the README file for the U-Boot project.
11224ee89b9Swdenk
11324ee89b9SwdenkFile names etc. shall be based on the string "u-boot". Examples:
11424ee89b9Swdenk
11524ee89b9Swdenk	include/asm-ppc/u-boot.h
11624ee89b9Swdenk
11724ee89b9Swdenk	#include <asm/u-boot.h>
11824ee89b9Swdenk
11924ee89b9SwdenkVariable names, preprocessor constants etc. shall be either based on
12024ee89b9Swdenkthe string "u_boot" or on "U_BOOT". Example:
12124ee89b9Swdenk
12224ee89b9Swdenk	U_BOOT_VERSION		u_boot_logo
12324ee89b9Swdenk	IH_OS_U_BOOT		u_boot_hush_start
124c609719bSwdenk
125c609719bSwdenk
12693f19cc0SwdenkVersioning:
12793f19cc0Swdenk===========
12893f19cc0Swdenk
129360d883aSThomas WeberStarting with the release in October 2008, the names of the releases
130360d883aSThomas Weberwere changed from numerical release numbers without deeper meaning
131360d883aSThomas Weberinto a time stamp based numbering. Regular releases are identified by
132360d883aSThomas Webernames consisting of the calendar year and month of the release date.
133360d883aSThomas WeberAdditional fields (if present) indicate release candidates or bug fix
134360d883aSThomas Weberreleases in "stable" maintenance trees.
13593f19cc0Swdenk
136360d883aSThomas WeberExamples:
137360d883aSThomas Weber	U-Boot v2009.11	    - Release November 2009
138360d883aSThomas Weber	U-Boot v2009.11.1   - Release 1 in version November 2009 stable tree
139360d883aSThomas Weber	U-Boot v2010.09-rc1 - Release candiate 1 for September 2010 release
14093f19cc0Swdenk
14193f19cc0Swdenk
142c609719bSwdenkDirectory Hierarchy:
143c609719bSwdenk====================
144c609719bSwdenk
1458d321b81SPeter Tyser/arch			Architecture specific files
1468d321b81SPeter Tyser  /arm			Files generic to ARM architecture
1478d321b81SPeter Tyser    /cpu		CPU specific files
1488d321b81SPeter Tyser      /arm720t		Files specific to ARM 720 CPUs
1498d321b81SPeter Tyser      /arm920t		Files specific to ARM 920 CPUs
1506eb0921aSAndreas Bießmann	/at91		Files specific to Atmel AT91RM9200 CPU
1518d321b81SPeter Tyser	/imx		Files specific to Freescale MC9328 i.MX CPUs
1528d321b81SPeter Tyser	/s3c24x0	Files specific to Samsung S3C24X0 CPUs
1538d321b81SPeter Tyser      /arm925t		Files specific to ARM 925 CPUs
1548d321b81SPeter Tyser      /arm926ejs	Files specific to ARM 926 CPUs
1558d321b81SPeter Tyser      /arm1136		Files specific to ARM 1136 CPUs
1568d321b81SPeter Tyser      /ixp		Files specific to Intel XScale IXP CPUs
1578d321b81SPeter Tyser      /pxa		Files specific to Intel XScale PXA CPUs
1588d321b81SPeter Tyser      /s3c44b0		Files specific to Samsung S3C44B0 CPUs
1598d321b81SPeter Tyser      /sa1100		Files specific to Intel StrongARM SA1100 CPUs
1608d321b81SPeter Tyser    /lib		Architecture specific library files
1618d321b81SPeter Tyser  /avr32		Files generic to AVR32 architecture
1628d321b81SPeter Tyser    /cpu		CPU specific files
1638d321b81SPeter Tyser    /lib		Architecture specific library files
1648d321b81SPeter Tyser  /blackfin		Files generic to Analog Devices Blackfin architecture
1658d321b81SPeter Tyser    /cpu		CPU specific files
1668d321b81SPeter Tyser    /lib		Architecture specific library files
167fea25720SGraeme Russ  /x86			Files generic to x86 architecture
1688d321b81SPeter Tyser    /cpu		CPU specific files
1698d321b81SPeter Tyser    /lib		Architecture specific library files
1708d321b81SPeter Tyser  /m68k			Files generic to m68k architecture
1718d321b81SPeter Tyser    /cpu		CPU specific files
1728d321b81SPeter Tyser      /mcf52x2		Files specific to Freescale ColdFire MCF52x2 CPUs
1738d321b81SPeter Tyser      /mcf5227x		Files specific to Freescale ColdFire MCF5227x CPUs
1748d321b81SPeter Tyser      /mcf532x		Files specific to Freescale ColdFire MCF5329 CPUs
1758d321b81SPeter Tyser      /mcf5445x		Files specific to Freescale ColdFire MCF5445x CPUs
1768d321b81SPeter Tyser      /mcf547x_8x	Files specific to Freescale ColdFire MCF547x_8x CPUs
1778d321b81SPeter Tyser    /lib		Architecture specific library files
1788d321b81SPeter Tyser  /microblaze		Files generic to microblaze architecture
1798d321b81SPeter Tyser    /cpu		CPU specific files
1808d321b81SPeter Tyser    /lib		Architecture specific library files
1818d321b81SPeter Tyser  /mips			Files generic to MIPS architecture
1828d321b81SPeter Tyser    /cpu		CPU specific files
18392bbd64eSDaniel Schwierzeck      /mips32		Files specific to MIPS32 CPUs
18480421fccSXiangfu Liu      /xburst		Files specific to Ingenic XBurst CPUs
1858d321b81SPeter Tyser    /lib		Architecture specific library files
186afc1ce82SMacpaul Lin  /nds32		Files generic to NDS32 architecture
187afc1ce82SMacpaul Lin    /cpu		CPU specific files
188afc1ce82SMacpaul Lin      /n1213		Files specific to Andes Technology N1213 CPUs
189afc1ce82SMacpaul Lin    /lib		Architecture specific library files
1908d321b81SPeter Tyser  /nios2		Files generic to Altera NIOS2 architecture
1918d321b81SPeter Tyser    /cpu		CPU specific files
1928d321b81SPeter Tyser    /lib		Architecture specific library files
193a47a12beSStefan Roese  /powerpc		Files generic to PowerPC architecture
1948d321b81SPeter Tyser    /cpu		CPU specific files
1958d321b81SPeter Tyser      /74xx_7xx		Files specific to Freescale MPC74xx and 7xx CPUs
1968d321b81SPeter Tyser      /mpc5xx		Files specific to Freescale MPC5xx CPUs
1978d321b81SPeter Tyser      /mpc5xxx		Files specific to Freescale MPC5xxx CPUs
1988d321b81SPeter Tyser      /mpc8xx		Files specific to Freescale MPC8xx CPUs
1998d321b81SPeter Tyser      /mpc8220		Files specific to Freescale MPC8220 CPUs
2008d321b81SPeter Tyser      /mpc824x		Files specific to Freescale MPC824x CPUs
2018d321b81SPeter Tyser      /mpc8260		Files specific to Freescale MPC8260 CPUs
2028d321b81SPeter Tyser      /mpc85xx		Files specific to Freescale MPC85xx CPUs
2038d321b81SPeter Tyser      /ppc4xx		Files specific to AMCC PowerPC 4xx CPUs
2048d321b81SPeter Tyser    /lib		Architecture specific library files
2058d321b81SPeter Tyser  /sh			Files generic to SH architecture
2068d321b81SPeter Tyser    /cpu		CPU specific files
2078d321b81SPeter Tyser      /sh2		Files specific to sh2 CPUs
2088d321b81SPeter Tyser      /sh3		Files specific to sh3 CPUs
2098d321b81SPeter Tyser      /sh4		Files specific to sh4 CPUs
2108d321b81SPeter Tyser    /lib		Architecture specific library files
2118d321b81SPeter Tyser  /sparc		Files generic to SPARC architecture
2128d321b81SPeter Tyser    /cpu		CPU specific files
2138d321b81SPeter Tyser      /leon2		Files specific to Gaisler LEON2 SPARC CPU
2148d321b81SPeter Tyser      /leon3		Files specific to Gaisler LEON3 SPARC CPU
2158d321b81SPeter Tyser    /lib		Architecture specific library files
2168d321b81SPeter Tyser/api			Machine/arch independent API for external apps
2178d321b81SPeter Tyser/board			Board dependent files
2188d321b81SPeter Tyser/common			Misc architecture independent functions
2198d321b81SPeter Tyser/disk			Code for disk drive partition handling
2208d321b81SPeter Tyser/doc			Documentation (don't expect too much)
2218d321b81SPeter Tyser/drivers		Commonly used device drivers
2228d321b81SPeter Tyser/examples		Example code for standalone applications, etc.
2238d321b81SPeter Tyser/fs			Filesystem code (cramfs, ext2, jffs2, etc.)
2248d321b81SPeter Tyser/include		Header Files
2258d321b81SPeter Tyser/lib			Files generic to all architectures
2268d321b81SPeter Tyser  /libfdt		Library files to support flattened device trees
2278d321b81SPeter Tyser  /lzma			Library files to support LZMA decompression
2288d321b81SPeter Tyser  /lzo			Library files to support LZO decompression
2298d321b81SPeter Tyser/net			Networking code
2308d321b81SPeter Tyser/post			Power On Self Test
2318d321b81SPeter Tyser/rtc			Real Time Clock drivers
2328d321b81SPeter Tyser/tools			Tools to build S-Record or U-Boot images, etc.
233c609719bSwdenk
234c609719bSwdenkSoftware Configuration:
235c609719bSwdenk=======================
236c609719bSwdenk
237c609719bSwdenkConfiguration is usually done using C preprocessor defines; the
238c609719bSwdenkrationale behind that is to avoid dead code whenever possible.
239c609719bSwdenk
240c609719bSwdenkThere are two classes of configuration variables:
241c609719bSwdenk
242c609719bSwdenk* Configuration _OPTIONS_:
243c609719bSwdenk  These are selectable by the user and have names beginning with
244c609719bSwdenk  "CONFIG_".
245c609719bSwdenk
246c609719bSwdenk* Configuration _SETTINGS_:
247c609719bSwdenk  These depend on the hardware etc. and should not be meddled with if
248c609719bSwdenk  you don't know what you're doing; they have names beginning with
2496d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  "CONFIG_SYS_".
250c609719bSwdenk
251c609719bSwdenkLater we will add a configuration tool - probably similar to or even
252c609719bSwdenkidentical to what's used for the Linux kernel. Right now, we have to
253c609719bSwdenkdo the configuration by hand, which means creating some symbolic
254c609719bSwdenklinks and editing some configuration files. We use the TQM8xxL boards
255c609719bSwdenkas an example here.
256c609719bSwdenk
257c609719bSwdenk
258c609719bSwdenkSelection of Processor Architecture and Board Type:
259c609719bSwdenk---------------------------------------------------
260c609719bSwdenk
261c609719bSwdenkFor all supported boards there are ready-to-use default
262c609719bSwdenkconfigurations available; just type "make <board_name>_config".
263c609719bSwdenk
264c609719bSwdenkExample: For a TQM823L module type:
265c609719bSwdenk
266c609719bSwdenk	cd u-boot
267c609719bSwdenk	make TQM823L_config
268c609719bSwdenk
26911ccc33fSMarcel ZiswilerFor the Cogent platform, you need to specify the CPU type as well;
270c609719bSwdenke.g. "make cogent_mpc8xx_config". And also configure the cogent
271c609719bSwdenkdirectory according to the instructions in cogent/README.
272c609719bSwdenk
273c609719bSwdenk
274c609719bSwdenkConfiguration Options:
275c609719bSwdenk----------------------
276c609719bSwdenk
277c609719bSwdenkConfiguration depends on the combination of board and CPU type; all
278c609719bSwdenksuch information is kept in a configuration file
279c609719bSwdenk"include/configs/<board_name>.h".
280c609719bSwdenk
281c609719bSwdenkExample: For a TQM823L module, all configuration settings are in
282c609719bSwdenk"include/configs/TQM823L.h".
283c609719bSwdenk
284c609719bSwdenk
2857f6c2cbcSwdenkMany of the options are named exactly as the corresponding Linux
2867f6c2cbcSwdenkkernel configuration options. The intention is to make it easier to
2877f6c2cbcSwdenkbuild a config tool - later.
2887f6c2cbcSwdenk
2897f6c2cbcSwdenk
290c609719bSwdenkThe following options need to be configured:
291c609719bSwdenk
2922628114eSKim Phillips- CPU Type:	Define exactly one, e.g. CONFIG_MPC85XX.
293c609719bSwdenk
2942628114eSKim Phillips- Board Type:	Define exactly one, e.g. CONFIG_MPC8540ADS.
2956ccec449SWolfgang Denk
2966ccec449SWolfgang Denk- CPU Daughterboard Type: (if CONFIG_ATSTK1000 is defined)
29709ea0de0SHaavard Skinnemoen		Define exactly one, e.g. CONFIG_ATSTK1002
298c609719bSwdenk
299c609719bSwdenk- CPU Module Type: (if CONFIG_COGENT is defined)
300c609719bSwdenk		Define exactly one of
301c609719bSwdenk		CONFIG_CMA286_60_OLD
302c609719bSwdenk--- FIXME --- not tested yet:
303c609719bSwdenk		CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P,
304c609719bSwdenk		CONFIG_CMA287_23, CONFIG_CMA287_50
305c609719bSwdenk
306c609719bSwdenk- Motherboard Type: (if CONFIG_COGENT is defined)
307c609719bSwdenk		Define exactly one of
308c609719bSwdenk		CONFIG_CMA101, CONFIG_CMA102
309c609719bSwdenk
310c609719bSwdenk- Motherboard I/O Modules: (if CONFIG_COGENT is defined)
311c609719bSwdenk		Define one or more of
312c609719bSwdenk		CONFIG_CMA302
313c609719bSwdenk
314c609719bSwdenk- Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined)
315c609719bSwdenk		Define one or more of
316c609719bSwdenk		CONFIG_LCD_HEARTBEAT	- update a character position on
31711ccc33fSMarcel Ziswiler					  the LCD display every second with
318c609719bSwdenk					  a "rotator" |\-/|\-/
319c609719bSwdenk
3202535d602Swdenk- Board flavour: (if CONFIG_MPC8260ADS is defined)
3212535d602Swdenk		CONFIG_ADSTYPE
3222535d602Swdenk		Possible values are:
3236d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_8260ADS	- original MPC8260ADS
3246d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_8266ADS	- MPC8266ADS
3256d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_PQ2FADS	- PQ2FADS-ZU or PQ2FADS-VR
3266d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_8272ADS	- MPC8272ADS
3272535d602Swdenk
328cf946c6dSLei Wen- Marvell Family Member
329cf946c6dSLei Wen		CONFIG_SYS_MVFS		- define it if you want to enable
330cf946c6dSLei Wen					  multiple fs option at one time
331cf946c6dSLei Wen					  for marvell soc family
332cf946c6dSLei Wen
333c609719bSwdenk- MPC824X Family Member (if CONFIG_MPC824X is defined)
334c609719bSwdenk		Define exactly one of
335c609719bSwdenk		CONFIG_MPC8240, CONFIG_MPC8245
336c609719bSwdenk
33711ccc33fSMarcel Ziswiler- 8xx CPU Options: (if using an MPC8xx CPU)
33866ca92a5Swdenk		CONFIG_8xx_GCLK_FREQ	- deprecated: CPU clock if
33966ca92a5Swdenk					  get_gclk_freq() cannot work
3405da627a4Swdenk					  e.g. if there is no 32KHz
3415da627a4Swdenk					  reference PIT/RTC clock
34266ca92a5Swdenk		CONFIG_8xx_OSCLK	- PLL input clock (either EXTCLK
34366ca92a5Swdenk					  or XTAL/EXTAL)
344c609719bSwdenk
34566ca92a5Swdenk- 859/866/885 CPU options: (if using a MPC859 or MPC866 or MPC885 CPU):
3466d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_8xx_CPUCLK_MIN
3476d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_8xx_CPUCLK_MAX
34866ca92a5Swdenk		CONFIG_8xx_CPUCLK_DEFAULT
34975d1ea7fSwdenk			See doc/README.MPC866
35075d1ea7fSwdenk
3516d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_MEASURE_CPUCLK
35275d1ea7fSwdenk
35375d1ea7fSwdenk		Define this to measure the actual CPU clock instead
35475d1ea7fSwdenk		of relying on the correctness of the configured
35575d1ea7fSwdenk		values. Mostly useful for board bringup to make sure
35675d1ea7fSwdenk		the PLL is locked at the intended frequency. Note
35775d1ea7fSwdenk		that this requires a (stable) reference clock (32 kHz
3586d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		RTC clock or CONFIG_SYS_8XX_XIN)
35975d1ea7fSwdenk
360506f3918SHeiko Schocher		CONFIG_SYS_DELAYED_ICACHE
361506f3918SHeiko Schocher
362506f3918SHeiko Schocher		Define this option if you want to enable the
363506f3918SHeiko Schocher		ICache only when Code runs from RAM.
364506f3918SHeiko Schocher
36566412c63SKumar Gala- 85xx CPU Options:
36666412c63SKumar Gala		CONFIG_SYS_FSL_TBCLK_DIV
36766412c63SKumar Gala
36866412c63SKumar Gala		Defines the core time base clock divider ratio compared to the
36966412c63SKumar Gala		system clock.  On most PQ3 devices this is 8, on newer QorIQ
37066412c63SKumar Gala		devices it can be 16 or 32.  The ratio varies from SoC to Soc.
37166412c63SKumar Gala
3728f29084aSKumar Gala		CONFIG_SYS_FSL_PCIE_COMPAT
3738f29084aSKumar Gala
3748f29084aSKumar Gala		Defines the string to utilize when trying to match PCIe device
3758f29084aSKumar Gala		tree nodes for the given platform.
3768f29084aSKumar Gala
3770b953ffcSMarkus Klotzbuecher- Intel Monahans options:
3786d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO
3790b953ffcSMarkus Klotzbuecher
3800b953ffcSMarkus Klotzbuecher		Defines the Monahans run mode to oscillator
3810b953ffcSMarkus Klotzbuecher		ratio. Valid values are 8, 16, 24, 31. The core
3820b953ffcSMarkus Klotzbuecher		frequency is this value multiplied by 13 MHz.
3830b953ffcSMarkus Klotzbuecher
3846d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_MONAHANS_TURBO_RUN_MODE_RATIO
3850b953ffcSMarkus Klotzbuecher
3860b953ffcSMarkus Klotzbuecher		Defines the Monahans turbo mode to oscillator
3870b953ffcSMarkus Klotzbuecher		ratio. Valid values are 1 (default if undefined) and
3880b953ffcSMarkus Klotzbuecher		2. The core frequency as calculated above is multiplied
3890b953ffcSMarkus Klotzbuecher		by this value.
3900b953ffcSMarkus Klotzbuecher
39192bbd64eSDaniel Schwierzeck- MIPS CPU options:
39292bbd64eSDaniel Schwierzeck		CONFIG_SYS_INIT_SP_OFFSET
39392bbd64eSDaniel Schwierzeck
39492bbd64eSDaniel Schwierzeck		Offset relative to CONFIG_SYS_SDRAM_BASE for initial stack
39592bbd64eSDaniel Schwierzeck		pointer. This is needed for the temporary stack before
39692bbd64eSDaniel Schwierzeck		relocation.
39792bbd64eSDaniel Schwierzeck
39892bbd64eSDaniel Schwierzeck		CONFIG_SYS_MIPS_CACHE_MODE
39992bbd64eSDaniel Schwierzeck
40092bbd64eSDaniel Schwierzeck		Cache operation mode for the MIPS CPU.
40192bbd64eSDaniel Schwierzeck		See also arch/mips/include/asm/mipsregs.h.
40292bbd64eSDaniel Schwierzeck		Possible values are:
40392bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_NO_WA
40492bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_WA
40592bbd64eSDaniel Schwierzeck			CONF_CM_UNCACHED
40692bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_NONCOHERENT
40792bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_CE
40892bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_COW
40992bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_CUW
41092bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_ACCELERATED
41192bbd64eSDaniel Schwierzeck
41292bbd64eSDaniel Schwierzeck		CONFIG_SYS_XWAY_EBU_BOOTCFG
41392bbd64eSDaniel Schwierzeck
41492bbd64eSDaniel Schwierzeck		Special option for Lantiq XWAY SoCs for booting from NOR flash.
41592bbd64eSDaniel Schwierzeck		See also arch/mips/cpu/mips32/start.S.
41692bbd64eSDaniel Schwierzeck
41792bbd64eSDaniel Schwierzeck		CONFIG_XWAY_SWAP_BYTES
41892bbd64eSDaniel Schwierzeck
41992bbd64eSDaniel Schwierzeck		Enable compilation of tools/xway-swap-bytes needed for Lantiq
42092bbd64eSDaniel Schwierzeck		XWAY SoCs for booting from NOR flash. The U-Boot image needs to
42192bbd64eSDaniel Schwierzeck		be swapped if a flash programmer is used.
42292bbd64eSDaniel Schwierzeck
4235da627a4Swdenk- Linux Kernel Interface:
424c609719bSwdenk		CONFIG_CLOCKS_IN_MHZ
425c609719bSwdenk
426c609719bSwdenk		U-Boot stores all clock information in Hz
427c609719bSwdenk		internally. For binary compatibility with older Linux
428c609719bSwdenk		kernels (which expect the clocks passed in the
429c609719bSwdenk		bd_info data to be in MHz) the environment variable
430c609719bSwdenk		"clocks_in_mhz" can be defined so that U-Boot
431c609719bSwdenk		converts clock data to MHZ before passing it to the
432c609719bSwdenk		Linux kernel.
433c609719bSwdenk		When CONFIG_CLOCKS_IN_MHZ is defined, a definition of
434c609719bSwdenk		"clocks_in_mhz=1" is automatically included in the
435c609719bSwdenk		default environment.
436c609719bSwdenk
4375da627a4Swdenk		CONFIG_MEMSIZE_IN_BYTES		[relevant for MIPS only]
4385da627a4Swdenk
43911ccc33fSMarcel Ziswiler		When transferring memsize parameter to linux, some versions
4405da627a4Swdenk		expect it to be in bytes, others in MB.
4415da627a4Swdenk		Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes.
4425da627a4Swdenk
443fec6d9eeSGerald Van Baren		CONFIG_OF_LIBFDT
444f57f70aaSWolfgang Denk
445f57f70aaSWolfgang Denk		New kernel versions are expecting firmware settings to be
446213bf8c8SGerald Van Baren		passed using flattened device trees (based on open firmware
447213bf8c8SGerald Van Baren		concepts).
448213bf8c8SGerald Van Baren
449213bf8c8SGerald Van Baren		CONFIG_OF_LIBFDT
450213bf8c8SGerald Van Baren		 * New libfdt-based support
451213bf8c8SGerald Van Baren		 * Adds the "fdt" command
4523bb342fcSKim Phillips		 * The bootm command automatically updates the fdt
453213bf8c8SGerald Van Baren
454b55ae402SMarcel Ziswiler		OF_CPU - The proper name of the cpus node (only required for
455b55ae402SMarcel Ziswiler			MPC512X and MPC5xxx based boards).
456b55ae402SMarcel Ziswiler		OF_SOC - The proper name of the soc node (only required for
457b55ae402SMarcel Ziswiler			MPC512X and MPC5xxx based boards).
458f57f70aaSWolfgang Denk		OF_TBCLK - The timebase frequency.
459c2871f03SKumar Gala		OF_STDOUT_PATH - The path to the console device
460f57f70aaSWolfgang Denk
46111ccc33fSMarcel Ziswiler		boards with QUICC Engines require OF_QE to set UCC MAC
46211ccc33fSMarcel Ziswiler		addresses
4633bb342fcSKim Phillips
4644e253137SKumar Gala		CONFIG_OF_BOARD_SETUP
4654e253137SKumar Gala
4664e253137SKumar Gala		Board code has addition modification that it wants to make
4674e253137SKumar Gala		to the flat device tree before handing it off to the kernel
4686705d81eSwdenk
4690267768eSMatthew McClintock		CONFIG_OF_BOOT_CPU
4700267768eSMatthew McClintock
47111ccc33fSMarcel Ziswiler		This define fills in the correct boot CPU in the boot
4720267768eSMatthew McClintock		param header, the default value is zero if undefined.
4730267768eSMatthew McClintock
4743887c3fbSHeiko Schocher		CONFIG_OF_IDE_FIXUP
4753887c3fbSHeiko Schocher
4763887c3fbSHeiko Schocher		U-Boot can detect if an IDE device is present or not.
4773887c3fbSHeiko Schocher		If not, and this new config option is activated, U-Boot
4783887c3fbSHeiko Schocher		removes the ATA node from the DTS before booting Linux,
4793887c3fbSHeiko Schocher		so the Linux IDE driver does not probe the device and
4803887c3fbSHeiko Schocher		crash. This is needed for buggy hardware (uc101) where
4813887c3fbSHeiko Schocher		no pull down resistor is connected to the signal IDE5V_DD7.
4823887c3fbSHeiko Schocher
4837eb29398SIgor Grinberg		CONFIG_MACH_TYPE	[relevant for ARM only][mandatory]
4847eb29398SIgor Grinberg
4857eb29398SIgor Grinberg		This setting is mandatory for all boards that have only one
4867eb29398SIgor Grinberg		machine type and must be used to specify the machine type
4877eb29398SIgor Grinberg		number as it appears in the ARM machine registry
4887eb29398SIgor Grinberg		(see http://www.arm.linux.org.uk/developer/machines/).
4897eb29398SIgor Grinberg		Only boards that have multiple machine types supported
4907eb29398SIgor Grinberg		in a single configuration file and the machine type is
4917eb29398SIgor Grinberg		runtime discoverable, do not have to use this setting.
4927eb29398SIgor Grinberg
4930b2f4ecaSNiklaus Giger- vxWorks boot parameters:
4940b2f4ecaSNiklaus Giger
4950b2f4ecaSNiklaus Giger		bootvx constructs a valid bootline using the following
4960b2f4ecaSNiklaus Giger		environments variables: bootfile, ipaddr, serverip, hostname.
4970b2f4ecaSNiklaus Giger		It loads the vxWorks image pointed bootfile.
4980b2f4ecaSNiklaus Giger
4990b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_BOOT_DEVICE - The vxworks device name
5000b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_MAC_PTR - Ethernet 6 byte MA -address
5010b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_SERVERNAME - Name of the server
5020b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_BOOT_ADDR - Address of boot parameters
5030b2f4ecaSNiklaus Giger
5040b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_ADD_PARAMS
5050b2f4ecaSNiklaus Giger
5060b2f4ecaSNiklaus Giger		Add it at the end of the bootline. E.g "u=username pw=secret"
5070b2f4ecaSNiklaus Giger
5080b2f4ecaSNiklaus Giger		Note: If a "bootargs" environment is defined, it will overwride
5090b2f4ecaSNiklaus Giger		the defaults discussed just above.
5100b2f4ecaSNiklaus Giger
5112c451f78SAneesh V- Cache Configuration:
5122c451f78SAneesh V		CONFIG_SYS_ICACHE_OFF - Do not enable instruction cache in U-Boot
5132c451f78SAneesh V		CONFIG_SYS_DCACHE_OFF - Do not enable data cache in U-Boot
5142c451f78SAneesh V		CONFIG_SYS_L2CACHE_OFF- Do not enable L2 cache in U-Boot
5152c451f78SAneesh V
51693bc2193SAneesh V- Cache Configuration for ARM:
51793bc2193SAneesh V		CONFIG_SYS_L2_PL310 - Enable support for ARM PL310 L2 cache
51893bc2193SAneesh V				      controller
51993bc2193SAneesh V		CONFIG_SYS_PL310_BASE - Physical base address of PL310
52093bc2193SAneesh V					controller register space
52193bc2193SAneesh V
5226705d81eSwdenk- Serial Ports:
52348d0192fSAndreas Engel		CONFIG_PL010_SERIAL
5246705d81eSwdenk
5256705d81eSwdenk		Define this if you want support for Amba PrimeCell PL010 UARTs.
5266705d81eSwdenk
52748d0192fSAndreas Engel		CONFIG_PL011_SERIAL
5286705d81eSwdenk
5296705d81eSwdenk		Define this if you want support for Amba PrimeCell PL011 UARTs.
5306705d81eSwdenk
5316705d81eSwdenk		CONFIG_PL011_CLOCK
5326705d81eSwdenk
5336705d81eSwdenk		If you have Amba PrimeCell PL011 UARTs, set this variable to
5346705d81eSwdenk		the clock speed of the UARTs.
5356705d81eSwdenk
5366705d81eSwdenk		CONFIG_PL01x_PORTS
5376705d81eSwdenk
5386705d81eSwdenk		If you have Amba PrimeCell PL010 or PL011 UARTs on your board,
5396705d81eSwdenk		define this to a list of base addresses for each (supported)
5406705d81eSwdenk		port. See e.g. include/configs/versatile.h
5416705d81eSwdenk
542910f1ae3SJohn Rigby		CONFIG_PL011_SERIAL_RLCR
543910f1ae3SJohn Rigby
544910f1ae3SJohn Rigby		Some vendor versions of PL011 serial ports (e.g. ST-Ericsson U8500)
545910f1ae3SJohn Rigby		have separate receive and transmit line control registers.  Set
546910f1ae3SJohn Rigby		this variable to initialize the extra register.
547910f1ae3SJohn Rigby
548910f1ae3SJohn Rigby		CONFIG_PL011_SERIAL_FLUSH_ON_INIT
549910f1ae3SJohn Rigby
550910f1ae3SJohn Rigby		On some platforms (e.g. U8500) U-Boot is loaded by a second stage
551910f1ae3SJohn Rigby		boot loader that has already initialized the UART.  Define this
552910f1ae3SJohn Rigby		variable to flush the UART at init time.
553910f1ae3SJohn Rigby
5546705d81eSwdenk
555c609719bSwdenk- Console Interface:
556c609719bSwdenk		Depending on board, define exactly one serial port
557c609719bSwdenk		(like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2,
558c609719bSwdenk		CONFIG_8xx_CONS_SCC1, ...), or switch off the serial
559c609719bSwdenk		console by defining CONFIG_8xx_CONS_NONE
560c609719bSwdenk
561c609719bSwdenk		Note: if CONFIG_8xx_CONS_NONE is defined, the serial
562c609719bSwdenk		port routines must be defined elsewhere
563c609719bSwdenk		(i.e. serial_init(), serial_getc(), ...)
564c609719bSwdenk
565c609719bSwdenk		CONFIG_CFB_CONSOLE
566c609719bSwdenk		Enables console device for a color framebuffer. Needs following
567c53043b7SWolfgang Denk		defines (cf. smiLynxEM, i8042)
568c609719bSwdenk			VIDEO_FB_LITTLE_ENDIAN	graphic memory organisation
569c609719bSwdenk						(default big endian)
570c609719bSwdenk			VIDEO_HW_RECTFILL	graphic chip supports
571c609719bSwdenk						rectangle fill
572c609719bSwdenk						(cf. smiLynxEM)
573c609719bSwdenk			VIDEO_HW_BITBLT		graphic chip supports
574c609719bSwdenk						bit-blit (cf. smiLynxEM)
575c609719bSwdenk			VIDEO_VISIBLE_COLS	visible pixel columns
576c609719bSwdenk						(cols=pitch)
577c609719bSwdenk			VIDEO_VISIBLE_ROWS	visible pixel rows
578c609719bSwdenk			VIDEO_PIXEL_SIZE	bytes per pixel
579c609719bSwdenk			VIDEO_DATA_FORMAT	graphic data format
580c609719bSwdenk						(0-5, cf. cfb_console.c)
581c609719bSwdenk			VIDEO_FB_ADRS		framebuffer address
582c609719bSwdenk			VIDEO_KBD_INIT_FCT	keyboard int fct
583c609719bSwdenk						(i.e. i8042_kbd_init())
584c609719bSwdenk			VIDEO_TSTC_FCT		test char fct
585c609719bSwdenk						(i.e. i8042_tstc)
586c609719bSwdenk			VIDEO_GETC_FCT		get char fct
587c609719bSwdenk						(i.e. i8042_getc)
588c609719bSwdenk			CONFIG_CONSOLE_CURSOR	cursor drawing on/off
589c609719bSwdenk						(requires blink timer
590c609719bSwdenk						cf. i8042.c)
5916d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c)
592c609719bSwdenk			CONFIG_CONSOLE_TIME	display time/date info in
593c609719bSwdenk						upper right corner
594602ad3b3SJon Loeliger						(requires CONFIG_CMD_DATE)
595c609719bSwdenk			CONFIG_VIDEO_LOGO	display Linux logo in
596c609719bSwdenk						upper left corner
597a6c7ad2fSwdenk			CONFIG_VIDEO_BMP_LOGO	use bmp_logo.h instead of
598a6c7ad2fSwdenk						linux_logo.h for logo.
599a6c7ad2fSwdenk						Requires CONFIG_VIDEO_LOGO
600c609719bSwdenk			CONFIG_CONSOLE_EXTRA_INFO
60111ccc33fSMarcel Ziswiler						additional board info beside
602c609719bSwdenk						the logo
603c609719bSwdenk
604c609719bSwdenk		When CONFIG_CFB_CONSOLE is defined, video console is
605c609719bSwdenk		default i/o. Serial console can be forced with
606c609719bSwdenk		environment 'console=serial'.
607c609719bSwdenk
608a3ad8e26Swdenk		When CONFIG_SILENT_CONSOLE is defined, all console
609a3ad8e26Swdenk		messages (by U-Boot and Linux!) can be silenced with
610a3ad8e26Swdenk		the "silent" environment variable. See
611a3ad8e26Swdenk		doc/README.silent for more information.
612a3ad8e26Swdenk
613c609719bSwdenk- Console Baudrate:
614c609719bSwdenk		CONFIG_BAUDRATE - in bps
615c609719bSwdenk		Select one of the baudrates listed in
6166d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BAUDRATE_TABLE, see below.
6176d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BRGCLK_PRESCALE, baudrate prescale
618c609719bSwdenk
619c92fac91SHeiko Schocher- Console Rx buffer length
620c92fac91SHeiko Schocher		With CONFIG_SYS_SMC_RXBUFLEN it is possible to define
621c92fac91SHeiko Schocher		the maximum receive buffer length for the SMC.
6222b3f12c2SHeiko Schocher		This option is actual only for 82xx and 8xx possible.
623c92fac91SHeiko Schocher		If using CONFIG_SYS_SMC_RXBUFLEN also CONFIG_SYS_MAXIDLE
624c92fac91SHeiko Schocher		must be defined, to setup the maximum idle timeout for
625c92fac91SHeiko Schocher		the SMC.
626c92fac91SHeiko Schocher
6279558b48aSGraeme Russ- Pre-Console Buffer:
6289558b48aSGraeme Russ		Prior to the console being initialised (i.e. serial UART
6299558b48aSGraeme Russ		initialised etc) all console output is silently discarded.
6309558b48aSGraeme Russ		Defining CONFIG_PRE_CONSOLE_BUFFER will cause U-Boot to
6319558b48aSGraeme Russ		buffer any console messages prior to the console being
6329558b48aSGraeme Russ		initialised to a buffer of size CONFIG_PRE_CON_BUF_SZ
6339558b48aSGraeme Russ		bytes located at CONFIG_PRE_CON_BUF_ADDR. The buffer is
6349558b48aSGraeme Russ		a circular buffer, so if more than CONFIG_PRE_CON_BUF_SZ
6359558b48aSGraeme Russ		bytes are output before the console is initialised, the
6369558b48aSGraeme Russ		earlier bytes are discarded.
6379558b48aSGraeme Russ
6389558b48aSGraeme Russ		'Sane' compilers will generate smaller code if
6399558b48aSGraeme Russ		CONFIG_PRE_CON_BUF_SZ is a power of 2
6409558b48aSGraeme Russ
641295d3942SSimon Glass- Pre-console putc():
642295d3942SSimon Glass		Prior to the console being initialised, console output is
643295d3942SSimon Glass		normally silently discarded. This can be annoying if a
644295d3942SSimon Glass		panic() happens in this time.
645295d3942SSimon Glass
646295d3942SSimon Glass		If the CONFIG_PRE_CONSOLE_PUTC option is defined, then
647295d3942SSimon Glass		U-Boot will call board_pre_console_putc() for each output
648295d3942SSimon Glass		character in this case, This function should try to output
649295d3942SSimon Glass		the character if possible, perhaps on all available UARTs
650295d3942SSimon Glass		(it will need to do this directly, since the console code
651295d3942SSimon Glass		is not functional yet). Note that if the panic happens
652295d3942SSimon Glass		early enough, then it is possible that board_init_f()
653295d3942SSimon Glass		(or even arch_cpu_init() on ARM) has not been called yet.
654295d3942SSimon Glass		You should init all clocks, GPIOs, etc. that are needed
655295d3942SSimon Glass		to get the character out. Baud rates will need to default
656295d3942SSimon Glass		to something sensible.
657295d3942SSimon Glass
658*046a37bdSSonny Rao- Safe printf() functions
659*046a37bdSSonny Rao		Define CONFIG_SYS_VSNPRINTF to compile in safe versions of
660*046a37bdSSonny Rao		the printf() functions. These are defined in
661*046a37bdSSonny Rao		include/vsprintf.h and include snprintf(), vsnprintf() and
662*046a37bdSSonny Rao		so on. Code size increase is approximately 300-500 bytes.
663*046a37bdSSonny Rao		If this option is not given then these functions will
664*046a37bdSSonny Rao		silently discard their buffer size argument - this means
665*046a37bdSSonny Rao		you are not getting any overflow checking in this case.
666*046a37bdSSonny Rao
667c609719bSwdenk- Boot Delay:	CONFIG_BOOTDELAY - in seconds
668c609719bSwdenk		Delay before automatically booting the default image;
669c609719bSwdenk		set to -1 to disable autoboot.
670c609719bSwdenk
671c609719bSwdenk		See doc/README.autoboot for these options that
672c609719bSwdenk		work with CONFIG_BOOTDELAY. None are required.
673c609719bSwdenk		CONFIG_BOOT_RETRY_TIME
674c609719bSwdenk		CONFIG_BOOT_RETRY_MIN
675c609719bSwdenk		CONFIG_AUTOBOOT_KEYED
676c609719bSwdenk		CONFIG_AUTOBOOT_PROMPT
677c609719bSwdenk		CONFIG_AUTOBOOT_DELAY_STR
678c609719bSwdenk		CONFIG_AUTOBOOT_STOP_STR
679c609719bSwdenk		CONFIG_AUTOBOOT_DELAY_STR2
680c609719bSwdenk		CONFIG_AUTOBOOT_STOP_STR2
681c609719bSwdenk		CONFIG_ZERO_BOOTDELAY_CHECK
682c609719bSwdenk		CONFIG_RESET_TO_RETRY
683c609719bSwdenk
684c609719bSwdenk- Autoboot Command:
685c609719bSwdenk		CONFIG_BOOTCOMMAND
686c609719bSwdenk		Only needed when CONFIG_BOOTDELAY is enabled;
687c609719bSwdenk		define a command string that is automatically executed
688c609719bSwdenk		when no character is read on the console interface
689c609719bSwdenk		within "Boot Delay" after reset.
690c609719bSwdenk
691c609719bSwdenk		CONFIG_BOOTARGS
692c609719bSwdenk		This can be used to pass arguments to the bootm
693c609719bSwdenk		command. The value of CONFIG_BOOTARGS goes into the
694c609719bSwdenk		environment value "bootargs".
695c609719bSwdenk
696c609719bSwdenk		CONFIG_RAMBOOT and CONFIG_NFSBOOT
697c609719bSwdenk		The value of these goes into the environment as
698c609719bSwdenk		"ramboot" and "nfsboot" respectively, and can be used
699c609719bSwdenk		as a convenience, when switching between booting from
70011ccc33fSMarcel Ziswiler		RAM and NFS.
701c609719bSwdenk
702c609719bSwdenk- Pre-Boot Commands:
703c609719bSwdenk		CONFIG_PREBOOT
704c609719bSwdenk
705c609719bSwdenk		When this option is #defined, the existence of the
706c609719bSwdenk		environment variable "preboot" will be checked
707c609719bSwdenk		immediately before starting the CONFIG_BOOTDELAY
708c609719bSwdenk		countdown and/or running the auto-boot command resp.
709c609719bSwdenk		entering interactive mode.
710c609719bSwdenk
711c609719bSwdenk		This feature is especially useful when "preboot" is
712c609719bSwdenk		automatically generated or modified. For an example
713c609719bSwdenk		see the LWMON board specific code: here "preboot" is
714c609719bSwdenk		modified when the user holds down a certain
715c609719bSwdenk		combination of keys on the (special) keyboard when
716c609719bSwdenk		booting the systems
717c609719bSwdenk
718c609719bSwdenk- Serial Download Echo Mode:
719c609719bSwdenk		CONFIG_LOADS_ECHO
720c609719bSwdenk		If defined to 1, all characters received during a
721c609719bSwdenk		serial download (using the "loads" command) are
722c609719bSwdenk		echoed back. This might be needed by some terminal
723c609719bSwdenk		emulations (like "cu"), but may as well just take
724c609719bSwdenk		time on others. This setting #define's the initial
725c609719bSwdenk		value of the "loads_echo" environment variable.
726c609719bSwdenk
727602ad3b3SJon Loeliger- Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined)
728c609719bSwdenk		CONFIG_KGDB_BAUDRATE
729c609719bSwdenk		Select one of the baudrates listed in
7306d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BAUDRATE_TABLE, see below.
731c609719bSwdenk
732c609719bSwdenk- Monitor Functions:
733602ad3b3SJon Loeliger		Monitor commands can be included or excluded
734602ad3b3SJon Loeliger		from the build by using the #include files
735602ad3b3SJon Loeliger		"config_cmd_all.h" and #undef'ing unwanted
736602ad3b3SJon Loeliger		commands, or using "config_cmd_default.h"
737602ad3b3SJon Loeliger		and augmenting with additional #define's
738602ad3b3SJon Loeliger		for wanted commands.
739c609719bSwdenk
740602ad3b3SJon Loeliger		The default command configuration includes all commands
741602ad3b3SJon Loeliger		except those marked below with a "*".
742602ad3b3SJon Loeliger
743602ad3b3SJon Loeliger		CONFIG_CMD_ASKENV	* ask for env variable
744602ad3b3SJon Loeliger		CONFIG_CMD_BDI		  bdinfo
745602ad3b3SJon Loeliger		CONFIG_CMD_BEDBUG	* Include BedBug Debugger
746602ad3b3SJon Loeliger		CONFIG_CMD_BMP		* BMP support
747602ad3b3SJon Loeliger		CONFIG_CMD_BSP		* Board specific commands
748602ad3b3SJon Loeliger		CONFIG_CMD_BOOTD	  bootd
749602ad3b3SJon Loeliger		CONFIG_CMD_CACHE	* icache, dcache
750602ad3b3SJon Loeliger		CONFIG_CMD_CONSOLE	  coninfo
751710b9938SMike Frysinger		CONFIG_CMD_CRC32	* crc32
752602ad3b3SJon Loeliger		CONFIG_CMD_DATE		* support for RTC, date/time...
753602ad3b3SJon Loeliger		CONFIG_CMD_DHCP		* DHCP support
754602ad3b3SJon Loeliger		CONFIG_CMD_DIAG		* Diagnostics
755a7c93104SPeter Tyser		CONFIG_CMD_DS4510	* ds4510 I2C gpio commands
756a7c93104SPeter Tyser		CONFIG_CMD_DS4510_INFO	* ds4510 I2C info command
757a7c93104SPeter Tyser		CONFIG_CMD_DS4510_MEM	* ds4510 I2C eeprom/sram commansd
758a7c93104SPeter Tyser		CONFIG_CMD_DS4510_RST	* ds4510 I2C rst command
759602ad3b3SJon Loeliger		CONFIG_CMD_DTT		* Digital Therm and Thermostat
760602ad3b3SJon Loeliger		CONFIG_CMD_ECHO		  echo arguments
761246c6922SPeter Tyser		CONFIG_CMD_EDITENV	  edit env variable
762602ad3b3SJon Loeliger		CONFIG_CMD_EEPROM	* EEPROM read/write support
763602ad3b3SJon Loeliger		CONFIG_CMD_ELF		* bootelf, bootvx
7640c79cda0SMike Frysinger		CONFIG_CMD_EXPORTENV	* export the environment
765bdab39d3SMike Frysinger		CONFIG_CMD_SAVEENV	  saveenv
766602ad3b3SJon Loeliger		CONFIG_CMD_FDC		* Floppy Disk Support
767602ad3b3SJon Loeliger		CONFIG_CMD_FAT		* FAT partition support
768602ad3b3SJon Loeliger		CONFIG_CMD_FDOS		* Dos diskette Support
769602ad3b3SJon Loeliger		CONFIG_CMD_FLASH	  flinfo, erase, protect
770602ad3b3SJon Loeliger		CONFIG_CMD_FPGA		  FPGA device initialization support
771a641b979SMike Frysinger		CONFIG_CMD_GO		* the 'go' command (exec code)
772a000b795SKim Phillips		CONFIG_CMD_GREPENV	* search environment
773602ad3b3SJon Loeliger		CONFIG_CMD_HWFLOW	* RTS/CTS hw flow control
774602ad3b3SJon Loeliger		CONFIG_CMD_I2C		* I2C serial bus support
775602ad3b3SJon Loeliger		CONFIG_CMD_IDE		* IDE harddisk support
776602ad3b3SJon Loeliger		CONFIG_CMD_IMI		  iminfo
777602ad3b3SJon Loeliger		CONFIG_CMD_IMLS		  List all found images
778602ad3b3SJon Loeliger		CONFIG_CMD_IMMAP	* IMMR dump support
7790c79cda0SMike Frysinger		CONFIG_CMD_IMPORTENV	* import an environment
780602ad3b3SJon Loeliger		CONFIG_CMD_IRQ		* irqinfo
781602ad3b3SJon Loeliger		CONFIG_CMD_ITEST	  Integer/string test of 2 values
782602ad3b3SJon Loeliger		CONFIG_CMD_JFFS2	* JFFS2 Support
783602ad3b3SJon Loeliger		CONFIG_CMD_KGDB		* kgdb
7841ba7fd25SMike Frysinger		CONFIG_CMD_LDRINFO	  ldrinfo (display Blackfin loader)
785602ad3b3SJon Loeliger		CONFIG_CMD_LOADB	  loadb
786602ad3b3SJon Loeliger		CONFIG_CMD_LOADS	  loads
78702c9aa1dSRobin Getz		CONFIG_CMD_MD5SUM	  print md5 message digest
78802c9aa1dSRobin Getz					  (requires CONFIG_CMD_MEMORY and CONFIG_MD5)
789602ad3b3SJon Loeliger		CONFIG_CMD_MEMORY	  md, mm, nm, mw, cp, cmp, crc, base,
79056523f12Swdenk					  loop, loopw, mtest
791602ad3b3SJon Loeliger		CONFIG_CMD_MISC		  Misc functions like sleep etc
792602ad3b3SJon Loeliger		CONFIG_CMD_MMC		* MMC memory mapped support
793602ad3b3SJon Loeliger		CONFIG_CMD_MII		* MII utility commands
79468d7d651SStefan Roese		CONFIG_CMD_MTDPARTS	* MTD partition support
795602ad3b3SJon Loeliger		CONFIG_CMD_NAND		* NAND support
796602ad3b3SJon Loeliger		CONFIG_CMD_NET		  bootp, tftpboot, rarpboot
797e92739d3SPeter Tyser		CONFIG_CMD_PCA953X	* PCA953x I2C gpio commands
798e92739d3SPeter Tyser		CONFIG_CMD_PCA953X_INFO * PCA953x I2C gpio info command
799602ad3b3SJon Loeliger		CONFIG_CMD_PCI		* pciinfo
800602ad3b3SJon Loeliger		CONFIG_CMD_PCMCIA		* PCMCIA support
801602ad3b3SJon Loeliger		CONFIG_CMD_PING		* send ICMP ECHO_REQUEST to network
802602ad3b3SJon Loeliger					  host
803602ad3b3SJon Loeliger		CONFIG_CMD_PORTIO	* Port I/O
804602ad3b3SJon Loeliger		CONFIG_CMD_REGINFO	* Register dump
805602ad3b3SJon Loeliger		CONFIG_CMD_RUN		  run command in env variable
806602ad3b3SJon Loeliger		CONFIG_CMD_SAVES	* save S record dump
807602ad3b3SJon Loeliger		CONFIG_CMD_SCSI		* SCSI Support
808602ad3b3SJon Loeliger		CONFIG_CMD_SDRAM	* print SDRAM configuration information
809602ad3b3SJon Loeliger					  (requires CONFIG_CMD_I2C)
810602ad3b3SJon Loeliger		CONFIG_CMD_SETGETDCR	  Support for DCR Register access
811602ad3b3SJon Loeliger					  (4xx only)
812c6b1ee66SAlexander Holler		CONFIG_CMD_SHA1SUM	  print sha1 memory digest
81302c9aa1dSRobin Getz					  (requires CONFIG_CMD_MEMORY)
81474de7aefSWolfgang Denk		CONFIG_CMD_SOURCE	  "source" command Support
815602ad3b3SJon Loeliger		CONFIG_CMD_SPI		* SPI serial bus support
8167a83af07SLuca Ceresoli		CONFIG_CMD_TFTPSRV	* TFTP transfer in server mode
8171fb7cd49SSimon Glass		CONFIG_CMD_TFTPPUT	* TFTP put command (upload)
818ca366d0eSChe-liang Chiou		CONFIG_CMD_TIME		* run command and report execution time
819602ad3b3SJon Loeliger		CONFIG_CMD_USB		* USB support
820602ad3b3SJon Loeliger		CONFIG_CMD_CDP		* Cisco Discover Protocol support
821602ad3b3SJon Loeliger		CONFIG_CMD_FSL		* Microblaze FSL support
822c609719bSwdenk
823c609719bSwdenk
824c609719bSwdenk		EXAMPLE: If you want all functions except of network
825c609719bSwdenk		support you can write:
826c609719bSwdenk
827602ad3b3SJon Loeliger		#include "config_cmd_all.h"
828602ad3b3SJon Loeliger		#undef CONFIG_CMD_NET
829c609719bSwdenk
830213bf8c8SGerald Van Baren	Other Commands:
831213bf8c8SGerald Van Baren		fdt (flattened device tree) command: CONFIG_OF_LIBFDT
832c609719bSwdenk
833c609719bSwdenk	Note:	Don't enable the "icache" and "dcache" commands
834602ad3b3SJon Loeliger		(configuration option CONFIG_CMD_CACHE) unless you know
835c609719bSwdenk		what you (and your U-Boot users) are doing. Data
836c609719bSwdenk		cache cannot be enabled on systems like the 8xx or
837c609719bSwdenk		8260 (where accesses to the IMMR region must be
838c609719bSwdenk		uncached), and it cannot be disabled on all other
839c609719bSwdenk		systems where we (mis-) use the data cache to hold an
840c609719bSwdenk		initial stack and some data.
841c609719bSwdenk
842c609719bSwdenk
843c609719bSwdenk		XXX - this list needs to get updated!
844c609719bSwdenk
84545ba8077SSimon Glass- Device tree:
84645ba8077SSimon Glass		CONFIG_OF_CONTROL
84745ba8077SSimon Glass		If this variable is defined, U-Boot will use a device tree
84845ba8077SSimon Glass		to configure its devices, instead of relying on statically
84945ba8077SSimon Glass		compiled #defines in the board file. This option is
85045ba8077SSimon Glass		experimental and only available on a few boards. The device
85145ba8077SSimon Glass		tree is available in the global data as gd->fdt_blob.
85245ba8077SSimon Glass
8532c0f79e4SSimon Glass		U-Boot needs to get its device tree from somewhere. This can
8542c0f79e4SSimon Glass		be done using one of the two options below:
855bbb0b128SSimon Glass
856bbb0b128SSimon Glass		CONFIG_OF_EMBED
857bbb0b128SSimon Glass		If this variable is defined, U-Boot will embed a device tree
858bbb0b128SSimon Glass		binary in its image. This device tree file should be in the
859bbb0b128SSimon Glass		board directory and called <soc>-<board>.dts. The binary file
860bbb0b128SSimon Glass		is then picked up in board_init_f() and made available through
861bbb0b128SSimon Glass		the global data structure as gd->blob.
86245ba8077SSimon Glass
8632c0f79e4SSimon Glass		CONFIG_OF_SEPARATE
8642c0f79e4SSimon Glass		If this variable is defined, U-Boot will build a device tree
8652c0f79e4SSimon Glass		binary. It will be called u-boot.dtb. Architecture-specific
8662c0f79e4SSimon Glass		code will locate it at run-time. Generally this works by:
8672c0f79e4SSimon Glass
8682c0f79e4SSimon Glass			cat u-boot.bin u-boot.dtb >image.bin
8692c0f79e4SSimon Glass
8702c0f79e4SSimon Glass		and in fact, U-Boot does this for you, creating a file called
8712c0f79e4SSimon Glass		u-boot-dtb.bin which is useful in the common case. You can
8722c0f79e4SSimon Glass		still use the individual files if you need something more
8732c0f79e4SSimon Glass		exotic.
8742c0f79e4SSimon Glass
875c609719bSwdenk- Watchdog:
876c609719bSwdenk		CONFIG_WATCHDOG
877c609719bSwdenk		If this variable is defined, it enables watchdog
8786abe6fb6SDetlev Zundel		support for the SoC. There must be support in the SoC
8796abe6fb6SDetlev Zundel		specific code for a watchdog. For the 8xx and 8260
8806abe6fb6SDetlev Zundel		CPUs, the SIU Watchdog feature is enabled in the SYPCR
8816abe6fb6SDetlev Zundel		register.  When supported for a specific SoC is
8826abe6fb6SDetlev Zundel		available, then no further board specific code should
8836abe6fb6SDetlev Zundel		be needed to use it.
8846abe6fb6SDetlev Zundel
8856abe6fb6SDetlev Zundel		CONFIG_HW_WATCHDOG
8866abe6fb6SDetlev Zundel		When using a watchdog circuitry external to the used
8876abe6fb6SDetlev Zundel		SoC, then define this variable and provide board
8886abe6fb6SDetlev Zundel		specific code for the "hw_watchdog_reset" function.
889c609719bSwdenk
890c1551ea8Sstroese- U-Boot Version:
891c1551ea8Sstroese		CONFIG_VERSION_VARIABLE
892c1551ea8Sstroese		If this variable is defined, an environment variable
893c1551ea8Sstroese		named "ver" is created by U-Boot showing the U-Boot
894c1551ea8Sstroese		version as printed by the "version" command.
895c1551ea8Sstroese		This variable is readonly.
896c1551ea8Sstroese
897c609719bSwdenk- Real-Time Clock:
898c609719bSwdenk
899602ad3b3SJon Loeliger		When CONFIG_CMD_DATE is selected, the type of the RTC
900c609719bSwdenk		has to be selected, too. Define exactly one of the
901c609719bSwdenk		following options:
902c609719bSwdenk
903c609719bSwdenk		CONFIG_RTC_MPC8xx	- use internal RTC of MPC8xx
904c609719bSwdenk		CONFIG_RTC_PCF8563	- use Philips PCF8563 RTC
9054e8b7544SFabio Estevam		CONFIG_RTC_MC13XXX	- use MC13783 or MC13892 RTC
906c609719bSwdenk		CONFIG_RTC_MC146818	- use MC146818 RTC
9071cb8e980Swdenk		CONFIG_RTC_DS1307	- use Maxim, Inc. DS1307 RTC
908c609719bSwdenk		CONFIG_RTC_DS1337	- use Maxim, Inc. DS1337 RTC
9097f70e853Swdenk		CONFIG_RTC_DS1338	- use Maxim, Inc. DS1338 RTC
9103bac3513Swdenk		CONFIG_RTC_DS164x	- use Dallas DS164x RTC
9119536dfccSTor Krill		CONFIG_RTC_ISL1208	- use Intersil ISL1208 RTC
9124c0d4c3bSwdenk		CONFIG_RTC_MAX6900	- use Maxim, Inc. MAX6900 RTC
9136d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_RTC_DS1337_NOOSC	- Turn off the OSC output for DS1337
91471d19f30SHeiko Schocher		CONFIG_SYS_RV3029_TCR	- enable trickle charger on
91571d19f30SHeiko Schocher					  RV3029 RTC.
916c609719bSwdenk
917b37c7e5eSwdenk		Note that if the RTC uses I2C, then the I2C interface
918b37c7e5eSwdenk		must also be configured. See I2C Support, below.
919b37c7e5eSwdenk
920e92739d3SPeter Tyser- GPIO Support:
921e92739d3SPeter Tyser		CONFIG_PCA953X		- use NXP's PCA953X series I2C GPIO
922e92739d3SPeter Tyser		CONFIG_PCA953X_INFO	- enable pca953x info command
923e92739d3SPeter Tyser
9245dec49caSChris Packham		The CONFIG_SYS_I2C_PCA953X_WIDTH option specifies a list of
9255dec49caSChris Packham		chip-ngpio pairs that tell the PCA953X driver the number of
9265dec49caSChris Packham		pins supported by a particular chip.
9275dec49caSChris Packham
928e92739d3SPeter Tyser		Note that if the GPIO device uses I2C, then the I2C interface
929e92739d3SPeter Tyser		must also be configured. See I2C Support, below.
930e92739d3SPeter Tyser
931c609719bSwdenk- Timestamp Support:
932c609719bSwdenk
933c609719bSwdenk		When CONFIG_TIMESTAMP is selected, the timestamp
934c609719bSwdenk		(date and time) of an image is printed by image
935c609719bSwdenk		commands like bootm or iminfo. This option is
936602ad3b3SJon Loeliger		automatically enabled when you select CONFIG_CMD_DATE .
937c609719bSwdenk
938c609719bSwdenk- Partition Support:
939c609719bSwdenk		CONFIG_MAC_PARTITION and/or CONFIG_DOS_PARTITION
94007f3d789Srichardretanubun		and/or CONFIG_ISO_PARTITION and/or CONFIG_EFI_PARTITION
941c609719bSwdenk
942602ad3b3SJon Loeliger		If IDE or SCSI support is enabled (CONFIG_CMD_IDE or
943218ca724SWolfgang Denk		CONFIG_CMD_SCSI) you must configure support for at
944218ca724SWolfgang Denk		least one partition type as well.
945c609719bSwdenk
946c609719bSwdenk- IDE Reset method:
9474d13cbadSwdenk		CONFIG_IDE_RESET_ROUTINE - this is defined in several
9484d13cbadSwdenk		board configurations files but used nowhere!
949c609719bSwdenk
9504d13cbadSwdenk		CONFIG_IDE_RESET - is this is defined, IDE Reset will
9514d13cbadSwdenk		be performed by calling the function
9524d13cbadSwdenk			ide_set_reset(int reset)
9534d13cbadSwdenk		which has to be defined in a board specific file
954c609719bSwdenk
955c609719bSwdenk- ATAPI Support:
956c609719bSwdenk		CONFIG_ATAPI
957c609719bSwdenk
958c609719bSwdenk		Set this to enable ATAPI support.
959c609719bSwdenk
960c40b2956Swdenk- LBA48 Support
961c40b2956Swdenk		CONFIG_LBA48
962c40b2956Swdenk
963c40b2956Swdenk		Set this to enable support for disks larger than 137GB
9644b142febSHeiko Schocher		Also look at CONFIG_SYS_64BIT_LBA.
965c40b2956Swdenk		Whithout these , LBA48 support uses 32bit variables and will 'only'
966c40b2956Swdenk		support disks up to 2.1TB.
967c40b2956Swdenk
9686d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_64BIT_LBA:
969c40b2956Swdenk			When enabled, makes the IDE subsystem use 64bit sector addresses.
970c40b2956Swdenk			Default is 32bit.
971c40b2956Swdenk
972c609719bSwdenk- SCSI Support:
973c609719bSwdenk		At the moment only there is only support for the
974c609719bSwdenk		SYM53C8XX SCSI controller; define
975c609719bSwdenk		CONFIG_SCSI_SYM53C8XX to enable it.
976c609719bSwdenk
9776d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_LUN [8], CONFIG_SYS_SCSI_MAX_SCSI_ID [7] and
9786d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_DEVICE [CONFIG_SYS_SCSI_MAX_SCSI_ID *
9796d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_LUN] can be adjusted to define the
980c609719bSwdenk		maximum numbers of LUNs, SCSI ID's and target
981c609719bSwdenk		devices.
9826d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz)
983c609719bSwdenk
984c609719bSwdenk- NETWORK Support (PCI):
985682011ffSwdenk		CONFIG_E1000
986ce5207e1SKyle Moffett		Support for Intel 8254x/8257x gigabit chips.
987ce5207e1SKyle Moffett
988ce5207e1SKyle Moffett		CONFIG_E1000_SPI
989ce5207e1SKyle Moffett		Utility code for direct access to the SPI bus on Intel 8257x.
990ce5207e1SKyle Moffett		This does not do anything useful unless you set at least one
991ce5207e1SKyle Moffett		of CONFIG_CMD_E1000 or CONFIG_E1000_SPI_GENERIC.
992ce5207e1SKyle Moffett
993ce5207e1SKyle Moffett		CONFIG_E1000_SPI_GENERIC
994ce5207e1SKyle Moffett		Allow generic access to the SPI bus on the Intel 8257x, for
995ce5207e1SKyle Moffett		example with the "sspi" command.
996ce5207e1SKyle Moffett
997ce5207e1SKyle Moffett		CONFIG_CMD_E1000
998ce5207e1SKyle Moffett		Management command for E1000 devices.  When used on devices
999ce5207e1SKyle Moffett		with SPI support you can reprogram the EEPROM from U-Boot.
1000682011ffSwdenk
1001ac3315c2SAndre Schwarz		CONFIG_E1000_FALLBACK_MAC
100211ccc33fSMarcel Ziswiler		default MAC for empty EEPROM after production.
1003ac3315c2SAndre Schwarz
1004c609719bSwdenk		CONFIG_EEPRO100
1005c609719bSwdenk		Support for Intel 82557/82559/82559ER chips.
100611ccc33fSMarcel Ziswiler		Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM
1007c609719bSwdenk		write routine for first time initialisation.
1008c609719bSwdenk
1009c609719bSwdenk		CONFIG_TULIP
1010c609719bSwdenk		Support for Digital 2114x chips.
1011c609719bSwdenk		Optional CONFIG_TULIP_SELECT_MEDIA for board specific
1012c609719bSwdenk		modem chip initialisation (KS8761/QS6611).
1013c609719bSwdenk
1014c609719bSwdenk		CONFIG_NATSEMI
1015c609719bSwdenk		Support for National dp83815 chips.
1016c609719bSwdenk
1017c609719bSwdenk		CONFIG_NS8382X
1018c609719bSwdenk		Support for National dp8382[01] gigabit chips.
1019c609719bSwdenk
102045219c46Swdenk- NETWORK Support (other):
102145219c46Swdenk
1022c041e9d2SJens Scharsig		CONFIG_DRIVER_AT91EMAC
1023c041e9d2SJens Scharsig		Support for AT91RM9200 EMAC.
1024c041e9d2SJens Scharsig
1025c041e9d2SJens Scharsig			CONFIG_RMII
1026c041e9d2SJens Scharsig			Define this to use reduced MII inteface
1027c041e9d2SJens Scharsig
1028c041e9d2SJens Scharsig			CONFIG_DRIVER_AT91EMAC_QUIET
1029c041e9d2SJens Scharsig			If this defined, the driver is quiet.
1030c041e9d2SJens Scharsig			The driver doen't show link status messages.
1031c041e9d2SJens Scharsig
103245219c46Swdenk		CONFIG_DRIVER_LAN91C96
103345219c46Swdenk		Support for SMSC's LAN91C96 chips.
103445219c46Swdenk
103545219c46Swdenk			CONFIG_LAN91C96_BASE
103645219c46Swdenk			Define this to hold the physical address
103745219c46Swdenk			of the LAN91C96's I/O space
103845219c46Swdenk
103945219c46Swdenk			CONFIG_LAN91C96_USE_32_BIT
104045219c46Swdenk			Define this to enable 32 bit addressing
104145219c46Swdenk
1042f39748aeSwdenk		CONFIG_DRIVER_SMC91111
1043f39748aeSwdenk		Support for SMSC's LAN91C111 chip
1044f39748aeSwdenk
1045f39748aeSwdenk			CONFIG_SMC91111_BASE
1046f39748aeSwdenk			Define this to hold the physical address
1047f39748aeSwdenk			of the device (I/O space)
1048f39748aeSwdenk
1049f39748aeSwdenk			CONFIG_SMC_USE_32_BIT
1050f39748aeSwdenk			Define this if data bus is 32 bits
1051f39748aeSwdenk
1052f39748aeSwdenk			CONFIG_SMC_USE_IOFUNCS
1053f39748aeSwdenk			Define this to use i/o functions instead of macros
1054f39748aeSwdenk			(some hardware wont work with macros)
1055f39748aeSwdenk
1056dc02badaSHeiko Schocher		CONFIG_DRIVER_TI_EMAC
1057dc02badaSHeiko Schocher		Support for davinci emac
1058dc02badaSHeiko Schocher
1059dc02badaSHeiko Schocher			CONFIG_SYS_DAVINCI_EMAC_PHY_COUNT
1060dc02badaSHeiko Schocher			Define this if you have more then 3 PHYs.
1061dc02badaSHeiko Schocher
1062b3dbf4a5SMacpaul Lin		CONFIG_FTGMAC100
1063b3dbf4a5SMacpaul Lin		Support for Faraday's FTGMAC100 Gigabit SoC Ethernet
1064b3dbf4a5SMacpaul Lin
1065b3dbf4a5SMacpaul Lin			CONFIG_FTGMAC100_EGIGA
1066b3dbf4a5SMacpaul Lin			Define this to use GE link update with gigabit PHY.
1067b3dbf4a5SMacpaul Lin			Define this if FTGMAC100 is connected to gigabit PHY.
1068b3dbf4a5SMacpaul Lin			If your system has 10/100 PHY only, it might not occur
1069b3dbf4a5SMacpaul Lin			wrong behavior. Because PHY usually return timeout or
1070b3dbf4a5SMacpaul Lin			useless data when polling gigabit status and gigabit
1071b3dbf4a5SMacpaul Lin			control registers. This behavior won't affect the
1072b3dbf4a5SMacpaul Lin			correctnessof 10/100 link speed update.
1073b3dbf4a5SMacpaul Lin
1074c2fff331SMike Rapoport		CONFIG_SMC911X
1075557b377dSJens Gehrlein		Support for SMSC's LAN911x and LAN921x chips
1076557b377dSJens Gehrlein
1077c2fff331SMike Rapoport			CONFIG_SMC911X_BASE
1078557b377dSJens Gehrlein			Define this to hold the physical address
1079557b377dSJens Gehrlein			of the device (I/O space)
1080557b377dSJens Gehrlein
1081c2fff331SMike Rapoport			CONFIG_SMC911X_32_BIT
1082557b377dSJens Gehrlein			Define this if data bus is 32 bits
1083557b377dSJens Gehrlein
1084c2fff331SMike Rapoport			CONFIG_SMC911X_16_BIT
1085557b377dSJens Gehrlein			Define this if data bus is 16 bits. If your processor
1086557b377dSJens Gehrlein			automatically converts one 32 bit word to two 16 bit
1087c2fff331SMike Rapoport			words you may also try CONFIG_SMC911X_32_BIT.
1088557b377dSJens Gehrlein
10893d0075faSYoshihiro Shimoda		CONFIG_SH_ETHER
10903d0075faSYoshihiro Shimoda		Support for Renesas on-chip Ethernet controller
10913d0075faSYoshihiro Shimoda
10923d0075faSYoshihiro Shimoda			CONFIG_SH_ETHER_USE_PORT
10933d0075faSYoshihiro Shimoda			Define the number of ports to be used
10943d0075faSYoshihiro Shimoda
10953d0075faSYoshihiro Shimoda			CONFIG_SH_ETHER_PHY_ADDR
10963d0075faSYoshihiro Shimoda			Define the ETH PHY's address
10973d0075faSYoshihiro Shimoda
109868260aabSYoshihiro Shimoda			CONFIG_SH_ETHER_CACHE_WRITEBACK
109968260aabSYoshihiro Shimoda			If this option is set, the driver enables cache flush.
110068260aabSYoshihiro Shimoda
11015e124724SVadim Bendebury- TPM Support:
11025e124724SVadim Bendebury		CONFIG_GENERIC_LPC_TPM
11035e124724SVadim Bendebury		Support for generic parallel port TPM devices. Only one device
11045e124724SVadim Bendebury		per system is supported at this time.
11055e124724SVadim Bendebury
11065e124724SVadim Bendebury			CONFIG_TPM_TIS_BASE_ADDRESS
11075e124724SVadim Bendebury			Base address where the generic TPM device is mapped
11085e124724SVadim Bendebury			to. Contemporary x86 systems usually map it at
11095e124724SVadim Bendebury			0xfed40000.
11105e124724SVadim Bendebury
1111c609719bSwdenk- USB Support:
1112c609719bSwdenk		At the moment only the UHCI host controller is
11134d13cbadSwdenk		supported (PIP405, MIP405, MPC5200); define
1114c609719bSwdenk		CONFIG_USB_UHCI to enable it.
1115c609719bSwdenk		define CONFIG_USB_KEYBOARD to enable the USB Keyboard
111630d56faeSwdenk		and define CONFIG_USB_STORAGE to enable the USB
1117c609719bSwdenk		storage devices.
1118c609719bSwdenk		Note:
1119c609719bSwdenk		Supported are USB Keyboards and USB Floppy drives
1120c609719bSwdenk		(TEAC FD-05PUB).
11214d13cbadSwdenk		MPC5200 USB requires additional defines:
11224d13cbadSwdenk			CONFIG_USB_CLOCK
11234d13cbadSwdenk				for 528 MHz Clock: 0x0001bbbb
1124307ecb6dSEric Millbrandt			CONFIG_PSC3_USB
1125307ecb6dSEric Millbrandt				for USB on PSC3
11264d13cbadSwdenk			CONFIG_USB_CONFIG
11274d13cbadSwdenk				for differential drivers: 0x00001000
11284d13cbadSwdenk				for single ended drivers: 0x00005000
1129307ecb6dSEric Millbrandt				for differential drivers on PSC3: 0x00000100
1130307ecb6dSEric Millbrandt				for single ended drivers on PSC3: 0x00004100
11316d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_USB_EVENT_POLL
1132fdcfaa1bSZhang Wei				May be defined to allow interrupt polling
1133fdcfaa1bSZhang Wei				instead of using asynchronous interrupts
11344d13cbadSwdenk
113516c8d5e7SWolfgang Denk- USB Device:
113616c8d5e7SWolfgang Denk		Define the below if you wish to use the USB console.
113716c8d5e7SWolfgang Denk		Once firmware is rebuilt from a serial console issue the
113816c8d5e7SWolfgang Denk		command "setenv stdin usbtty; setenv stdout usbtty" and
113911ccc33fSMarcel Ziswiler		attach your USB cable. The Unix command "dmesg" should print
114016c8d5e7SWolfgang Denk		it has found a new device. The environment variable usbtty
114116c8d5e7SWolfgang Denk		can be set to gserial or cdc_acm to enable your device to
114216c8d5e7SWolfgang Denk		appear to a USB host as a Linux gserial device or a
114316c8d5e7SWolfgang Denk		Common Device Class Abstract Control Model serial device.
114416c8d5e7SWolfgang Denk		If you select usbtty = gserial you should be able to enumerate
114516c8d5e7SWolfgang Denk		a Linux host by
114616c8d5e7SWolfgang Denk		# modprobe usbserial vendor=0xVendorID product=0xProductID
114716c8d5e7SWolfgang Denk		else if using cdc_acm, simply setting the environment
114816c8d5e7SWolfgang Denk		variable usbtty to be cdc_acm should suffice. The following
114916c8d5e7SWolfgang Denk		might be defined in YourBoardName.h
115016c8d5e7SWolfgang Denk
115116c8d5e7SWolfgang Denk			CONFIG_USB_DEVICE
115216c8d5e7SWolfgang Denk			Define this to build a UDC device
115316c8d5e7SWolfgang Denk
115416c8d5e7SWolfgang Denk			CONFIG_USB_TTY
115516c8d5e7SWolfgang Denk			Define this to have a tty type of device available to
115616c8d5e7SWolfgang Denk			talk to the UDC device
115716c8d5e7SWolfgang Denk
11586d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_CONSOLE_IS_IN_ENV
115916c8d5e7SWolfgang Denk			Define this if you want stdin, stdout &/or stderr to
116016c8d5e7SWolfgang Denk			be set to usbtty.
116116c8d5e7SWolfgang Denk
116216c8d5e7SWolfgang Denk			mpc8xx:
11636d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				CONFIG_SYS_USB_EXTC_CLK 0xBLAH
116416c8d5e7SWolfgang Denk				Derive USB clock from external clock "blah"
11656d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				- CONFIG_SYS_USB_EXTC_CLK 0x02
116616c8d5e7SWolfgang Denk
11676d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				CONFIG_SYS_USB_BRG_CLK 0xBLAH
116816c8d5e7SWolfgang Denk				Derive USB clock from brgclk
11696d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				- CONFIG_SYS_USB_BRG_CLK 0x04
117016c8d5e7SWolfgang Denk
117116c8d5e7SWolfgang Denk		If you have a USB-IF assigned VendorID then you may wish to
117216c8d5e7SWolfgang Denk		define your own vendor specific values either in BoardName.h
117316c8d5e7SWolfgang Denk		or directly in usbd_vendor_info.h. If you don't define
117416c8d5e7SWolfgang Denk		CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME,
117516c8d5e7SWolfgang Denk		CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot
117616c8d5e7SWolfgang Denk		should pretend to be a Linux device to it's target host.
117716c8d5e7SWolfgang Denk
117816c8d5e7SWolfgang Denk			CONFIG_USBD_MANUFACTURER
117916c8d5e7SWolfgang Denk			Define this string as the name of your company for
118016c8d5e7SWolfgang Denk			- CONFIG_USBD_MANUFACTURER "my company"
118116c8d5e7SWolfgang Denk
118216c8d5e7SWolfgang Denk			CONFIG_USBD_PRODUCT_NAME
118316c8d5e7SWolfgang Denk			Define this string as the name of your product
118416c8d5e7SWolfgang Denk			- CONFIG_USBD_PRODUCT_NAME "acme usb device"
118516c8d5e7SWolfgang Denk
118616c8d5e7SWolfgang Denk			CONFIG_USBD_VENDORID
118716c8d5e7SWolfgang Denk			Define this as your assigned Vendor ID from the USB
118816c8d5e7SWolfgang Denk			Implementors Forum. This *must* be a genuine Vendor ID
118916c8d5e7SWolfgang Denk			to avoid polluting the USB namespace.
119016c8d5e7SWolfgang Denk			- CONFIG_USBD_VENDORID 0xFFFF
119116c8d5e7SWolfgang Denk
119216c8d5e7SWolfgang Denk			CONFIG_USBD_PRODUCTID
119316c8d5e7SWolfgang Denk			Define this as the unique Product ID
119416c8d5e7SWolfgang Denk			for your device
119516c8d5e7SWolfgang Denk			- CONFIG_USBD_PRODUCTID 0xFFFF
1196c609719bSwdenk
1197d70a560fSIgor Grinberg- ULPI Layer Support:
1198d70a560fSIgor Grinberg		The ULPI (UTMI Low Pin (count) Interface) PHYs are supported via
1199d70a560fSIgor Grinberg		the generic ULPI layer. The generic layer accesses the ULPI PHY
1200d70a560fSIgor Grinberg		via the platform viewport, so you need both the genric layer and
1201d70a560fSIgor Grinberg		the viewport enabled. Currently only Chipidea/ARC based
1202d70a560fSIgor Grinberg		viewport is supported.
1203d70a560fSIgor Grinberg		To enable the ULPI layer support, define CONFIG_USB_ULPI and
1204d70a560fSIgor Grinberg		CONFIG_USB_ULPI_VIEWPORT in your board configuration file.
1205c609719bSwdenk
1206c609719bSwdenk- MMC Support:
1207c609719bSwdenk		The MMC controller on the Intel PXA is supported. To
1208c609719bSwdenk		enable this define CONFIG_MMC. The MMC can be
1209c609719bSwdenk		accessed from the boot prompt by mapping the device
1210c609719bSwdenk		to physical memory similar to flash. Command line is
1211602ad3b3SJon Loeliger		enabled with CONFIG_CMD_MMC. The MMC driver also works with
1212602ad3b3SJon Loeliger		the FAT fs. This is enabled with CONFIG_CMD_FAT.
1213c609719bSwdenk
1214afb35666SYoshihiro Shimoda		CONFIG_SH_MMCIF
1215afb35666SYoshihiro Shimoda		Support for Renesas on-chip MMCIF controller
1216afb35666SYoshihiro Shimoda
1217afb35666SYoshihiro Shimoda			CONFIG_SH_MMCIF_ADDR
1218afb35666SYoshihiro Shimoda			Define the base address of MMCIF registers
1219afb35666SYoshihiro Shimoda
1220afb35666SYoshihiro Shimoda			CONFIG_SH_MMCIF_CLK
1221afb35666SYoshihiro Shimoda			Define the clock frequency for MMCIF
1222afb35666SYoshihiro Shimoda
12236705d81eSwdenk- Journaling Flash filesystem support:
12246705d81eSwdenk		CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE,
12256705d81eSwdenk		CONFIG_JFFS2_NAND_DEV
12266705d81eSwdenk		Define these for a default partition on a NAND device
12276705d81eSwdenk
12286d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS2_FIRST_SECTOR,
12296d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS2_FIRST_BANK, CONFIG_SYS_JFFS2_NUM_BANKS
12306705d81eSwdenk		Define these for a default partition on a NOR device
12316705d81eSwdenk
12326d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS_CUSTOM_PART
12336705d81eSwdenk		Define this to create an own partition. You have to provide a
12346705d81eSwdenk		function struct part_info* jffs2_part_info(int part_num)
12356705d81eSwdenk
12366705d81eSwdenk		If you define only one JFFS2 partition you may also want to
12376d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		#define CONFIG_SYS_JFFS_SINGLE_PART	1
12386705d81eSwdenk		to disable the command chpart. This is the default when you
12396705d81eSwdenk		have not defined a custom partition
12406705d81eSwdenk
1241c30a15e5SDonggeun Kim- FAT(File Allocation Table) filesystem write function support:
1242c30a15e5SDonggeun Kim		CONFIG_FAT_WRITE
1243c30a15e5SDonggeun Kim		Support for saving memory data as a file
1244c30a15e5SDonggeun Kim		in FAT formatted partition
1245c30a15e5SDonggeun Kim
1246c609719bSwdenk- Keyboard Support:
1247c609719bSwdenk		CONFIG_ISA_KEYBOARD
1248c609719bSwdenk
1249c609719bSwdenk		Define this to enable standard (PC-Style) keyboard
1250c609719bSwdenk		support
1251c609719bSwdenk
1252c609719bSwdenk		CONFIG_I8042_KBD
1253c609719bSwdenk		Standard PC keyboard driver with US (is default) and
1254c609719bSwdenk		GERMAN key layout (switch via environment 'keymap=de') support.
1255c609719bSwdenk		Export function i8042_kbd_init, i8042_tstc and i8042_getc
1256c609719bSwdenk		for cfb_console. Supports cursor blinking.
1257c609719bSwdenk
1258c609719bSwdenk- Video support:
1259c609719bSwdenk		CONFIG_VIDEO
1260c609719bSwdenk
1261c609719bSwdenk		Define this to enable video support (for output to
1262c609719bSwdenk		video).
1263c609719bSwdenk
1264c609719bSwdenk		CONFIG_VIDEO_CT69000
1265c609719bSwdenk
1266c609719bSwdenk		Enable Chips & Technologies 69000 Video chip
1267c609719bSwdenk
1268c609719bSwdenk		CONFIG_VIDEO_SMI_LYNXEM
1269eeb1b77bSwdenk		Enable Silicon Motion SMI 712/710/810 Video chip. The
1270eeb1b77bSwdenk		video output is selected via environment 'videoout'
1271eeb1b77bSwdenk		(1 = LCD and 2 = CRT). If videoout is undefined, CRT is
1272eeb1b77bSwdenk		assumed.
1273c609719bSwdenk
1274eeb1b77bSwdenk		For the CT69000 and SMI_LYNXEM drivers, videomode is
127511ccc33fSMarcel Ziswiler		selected via environment 'videomode'. Two different ways
1276eeb1b77bSwdenk		are possible:
1277eeb1b77bSwdenk		- "videomode=num"   'num' is a standard LiLo mode numbers.
1278eeb1b77bSwdenk		Following standard modes are supported	(* is default):
1279eeb1b77bSwdenk
1280eeb1b77bSwdenk		      Colors	640x480 800x600 1024x768 1152x864 1280x1024
1281eeb1b77bSwdenk		-------------+---------------------------------------------
1282eeb1b77bSwdenk		      8 bits |	0x301*	0x303	 0x305	  0x161	    0x307
1283eeb1b77bSwdenk		     15 bits |	0x310	0x313	 0x316	  0x162	    0x319
1284eeb1b77bSwdenk		     16 bits |	0x311	0x314	 0x317	  0x163	    0x31A
1285eeb1b77bSwdenk		     24 bits |	0x312	0x315	 0x318	    ?	    0x31B
1286eeb1b77bSwdenk		-------------+---------------------------------------------
1287c609719bSwdenk		(i.e. setenv videomode 317; saveenv; reset;)
1288c609719bSwdenk
1289eeb1b77bSwdenk		- "videomode=bootargs" all the video parameters are parsed
12907817cb20SMarcel Ziswiler		from the bootargs. (See drivers/video/videomodes.c)
1291eeb1b77bSwdenk
1292eeb1b77bSwdenk
1293a6c7ad2fSwdenk		CONFIG_VIDEO_SED13806
1294a6c7ad2fSwdenk		Enable Epson SED13806 driver. This driver supports 8bpp
1295a6c7ad2fSwdenk		and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP
1296a6c7ad2fSwdenk		or CONFIG_VIDEO_SED13806_16BPP
1297a6c7ad2fSwdenk
12987d3053fbSTimur Tabi		CONFIG_FSL_DIU_FB
12997d3053fbSTimur Tabi		Enable the Freescale DIU video driver.	Reference boards for
13007d3053fbSTimur Tabi		SOCs that have a DIU should define this macro to enable DIU
13017d3053fbSTimur Tabi		support, and should also define these other macros:
13027d3053fbSTimur Tabi
13037d3053fbSTimur Tabi			CONFIG_SYS_DIU_ADDR
13047d3053fbSTimur Tabi			CONFIG_VIDEO
13057d3053fbSTimur Tabi			CONFIG_CMD_BMP
13067d3053fbSTimur Tabi			CONFIG_CFB_CONSOLE
13077d3053fbSTimur Tabi			CONFIG_VIDEO_SW_CURSOR
13087d3053fbSTimur Tabi			CONFIG_VGA_AS_SINGLE_DEVICE
13097d3053fbSTimur Tabi			CONFIG_VIDEO_LOGO
13107d3053fbSTimur Tabi			CONFIG_VIDEO_BMP_LOGO
13117d3053fbSTimur Tabi
1312ba8e76bdSTimur Tabi		The DIU driver will look for the 'video-mode' environment
1313ba8e76bdSTimur Tabi		variable, and if defined, enable the DIU as a console during
1314ba8e76bdSTimur Tabi		boot.  See the documentation file README.video for a
1315ba8e76bdSTimur Tabi		description of this variable.
13167d3053fbSTimur Tabi
1317682011ffSwdenk- Keyboard Support:
1318682011ffSwdenk		CONFIG_KEYBOARD
1319682011ffSwdenk
1320682011ffSwdenk		Define this to enable a custom keyboard support.
1321682011ffSwdenk		This simply calls drv_keyboard_init() which must be
1322682011ffSwdenk		defined in your board-specific files.
1323682011ffSwdenk		The only board using this so far is RBC823.
1324a6c7ad2fSwdenk
1325c609719bSwdenk- LCD Support:	CONFIG_LCD
1326c609719bSwdenk
1327c609719bSwdenk		Define this to enable LCD support (for output to LCD
1328c609719bSwdenk		display); also select one of the supported displays
1329c609719bSwdenk		by defining one of these:
1330c609719bSwdenk
133139cf4804SStelian Pop		CONFIG_ATMEL_LCD:
133239cf4804SStelian Pop
133339cf4804SStelian Pop			HITACHI TX09D70VM1CCA, 3.5", 240x320.
133439cf4804SStelian Pop
1335fd3103bbSwdenk		CONFIG_NEC_NL6448AC33:
1336c609719bSwdenk
1337fd3103bbSwdenk			NEC NL6448AC33-18. Active, color, single scan.
1338c609719bSwdenk
1339fd3103bbSwdenk		CONFIG_NEC_NL6448BC20
1340c609719bSwdenk
1341fd3103bbSwdenk			NEC NL6448BC20-08. 6.5", 640x480.
1342fd3103bbSwdenk			Active, color, single scan.
1343fd3103bbSwdenk
1344fd3103bbSwdenk		CONFIG_NEC_NL6448BC33_54
1345fd3103bbSwdenk
1346fd3103bbSwdenk			NEC NL6448BC33-54. 10.4", 640x480.
1347c609719bSwdenk			Active, color, single scan.
1348c609719bSwdenk
1349c609719bSwdenk		CONFIG_SHARP_16x9
1350c609719bSwdenk
1351c609719bSwdenk			Sharp 320x240. Active, color, single scan.
1352c609719bSwdenk			It isn't 16x9, and I am not sure what it is.
1353c609719bSwdenk
1354c609719bSwdenk		CONFIG_SHARP_LQ64D341
1355c609719bSwdenk
1356c609719bSwdenk			Sharp LQ64D341 display, 640x480.
1357c609719bSwdenk			Active, color, single scan.
1358c609719bSwdenk
1359c609719bSwdenk		CONFIG_HLD1045
1360c609719bSwdenk
1361c609719bSwdenk			HLD1045 display, 640x480.
1362c609719bSwdenk			Active, color, single scan.
1363c609719bSwdenk
1364c609719bSwdenk		CONFIG_OPTREX_BW
1365c609719bSwdenk
1366c609719bSwdenk			Optrex	 CBL50840-2 NF-FW 99 22 M5
1367c609719bSwdenk			or
1368c609719bSwdenk			Hitachi	 LMG6912RPFC-00T
1369c609719bSwdenk			or
1370c609719bSwdenk			Hitachi	 SP14Q002
1371c609719bSwdenk
1372c609719bSwdenk			320x240. Black & white.
1373c609719bSwdenk
1374c609719bSwdenk		Normally display is black on white background; define
13756d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_WHITE_ON_BLACK to get it inverted.
1376c609719bSwdenk
13777152b1d0Swdenk- Splash Screen Support: CONFIG_SPLASH_SCREEN
1378d791b1dcSwdenk
1379d791b1dcSwdenk		If this option is set, the environment is checked for
1380d791b1dcSwdenk		a variable "splashimage". If found, the usual display
1381d791b1dcSwdenk		of logo, copyright and system information on the LCD
1382e94d2cd9Swdenk		is suppressed and the BMP image at the address
1383d791b1dcSwdenk		specified in "splashimage" is loaded instead. The
1384d791b1dcSwdenk		console is redirected to the "nulldev", too. This
1385d791b1dcSwdenk		allows for a "silent" boot where a splash screen is
1386d791b1dcSwdenk		loaded very quickly after power-on.
1387d791b1dcSwdenk
13881ca298ceSMatthias Weisser		CONFIG_SPLASH_SCREEN_ALIGN
13891ca298ceSMatthias Weisser
13901ca298ceSMatthias Weisser		If this option is set the splash image can be freely positioned
13911ca298ceSMatthias Weisser		on the screen. Environment variable "splashpos" specifies the
13921ca298ceSMatthias Weisser		position as "x,y". If a positive number is given it is used as
13931ca298ceSMatthias Weisser		number of pixel from left/top. If a negative number is given it
13941ca298ceSMatthias Weisser		is used as number of pixel from right/bottom. You can also
13951ca298ceSMatthias Weisser		specify 'm' for centering the image.
13961ca298ceSMatthias Weisser
13971ca298ceSMatthias Weisser		Example:
13981ca298ceSMatthias Weisser		setenv splashpos m,m
13991ca298ceSMatthias Weisser			=> image at center of screen
14001ca298ceSMatthias Weisser
14011ca298ceSMatthias Weisser		setenv splashpos 30,20
14021ca298ceSMatthias Weisser			=> image at x = 30 and y = 20
14031ca298ceSMatthias Weisser
14041ca298ceSMatthias Weisser		setenv splashpos -10,m
14051ca298ceSMatthias Weisser			=> vertically centered image
14061ca298ceSMatthias Weisser			   at x = dspWidth - bmpWidth - 9
14071ca298ceSMatthias Weisser
140898f4a3dfSStefan Roese- Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP
140998f4a3dfSStefan Roese
141098f4a3dfSStefan Roese		If this option is set, additionally to standard BMP
141198f4a3dfSStefan Roese		images, gzipped BMP images can be displayed via the
141298f4a3dfSStefan Roese		splashscreen support or the bmp command.
141398f4a3dfSStefan Roese
1414d5011762SAnatolij Gustschin- Run length encoded BMP image (RLE8) support: CONFIG_VIDEO_BMP_RLE8
1415d5011762SAnatolij Gustschin
1416d5011762SAnatolij Gustschin		If this option is set, 8-bit RLE compressed BMP images
1417d5011762SAnatolij Gustschin		can be displayed via the splashscreen support or the
1418d5011762SAnatolij Gustschin		bmp command.
1419d5011762SAnatolij Gustschin
1420c29fdfc1Swdenk- Compression support:
1421c29fdfc1Swdenk		CONFIG_BZIP2
1422c29fdfc1Swdenk
1423c29fdfc1Swdenk		If this option is set, support for bzip2 compressed
1424c29fdfc1Swdenk		images is included. If not, only uncompressed and gzip
1425c29fdfc1Swdenk		compressed images are supported.
1426c29fdfc1Swdenk
1427c29fdfc1Swdenk		NOTE: the bzip2 algorithm requires a lot of RAM, so
14286d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		the malloc area (as defined by CONFIG_SYS_MALLOC_LEN) should
1429c29fdfc1Swdenk		be at least 4MB.
1430d791b1dcSwdenk
1431fc9c1727SLuigi 'Comio' Mantellini		CONFIG_LZMA
1432fc9c1727SLuigi 'Comio' Mantellini
1433fc9c1727SLuigi 'Comio' Mantellini		If this option is set, support for lzma compressed
1434fc9c1727SLuigi 'Comio' Mantellini		images is included.
1435fc9c1727SLuigi 'Comio' Mantellini
1436fc9c1727SLuigi 'Comio' Mantellini		Note: The LZMA algorithm adds between 2 and 4KB of code and it
1437fc9c1727SLuigi 'Comio' Mantellini		requires an amount of dynamic memory that is given by the
1438fc9c1727SLuigi 'Comio' Mantellini		formula:
1439fc9c1727SLuigi 'Comio' Mantellini
1440fc9c1727SLuigi 'Comio' Mantellini			(1846 + 768 << (lc + lp)) * sizeof(uint16)
1441fc9c1727SLuigi 'Comio' Mantellini
1442fc9c1727SLuigi 'Comio' Mantellini		Where lc and lp stand for, respectively, Literal context bits
1443fc9c1727SLuigi 'Comio' Mantellini		and Literal pos bits.
1444fc9c1727SLuigi 'Comio' Mantellini
1445fc9c1727SLuigi 'Comio' Mantellini		This value is upper-bounded by 14MB in the worst case. Anyway,
1446fc9c1727SLuigi 'Comio' Mantellini		for a ~4MB large kernel image, we have lc=3 and lp=0 for a
1447fc9c1727SLuigi 'Comio' Mantellini		total amount of (1846 + 768 << (3 + 0)) * 2 = ~41KB... that is
1448fc9c1727SLuigi 'Comio' Mantellini		a very small buffer.
1449fc9c1727SLuigi 'Comio' Mantellini
1450fc9c1727SLuigi 'Comio' Mantellini		Use the lzmainfo tool to determinate the lc and lp values and
1451fc9c1727SLuigi 'Comio' Mantellini		then calculate the amount of needed dynamic memory (ensuring
14526d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		the appropriate CONFIG_SYS_MALLOC_LEN value).
1453fc9c1727SLuigi 'Comio' Mantellini
145417ea1177Swdenk- MII/PHY support:
145517ea1177Swdenk		CONFIG_PHY_ADDR
145617ea1177Swdenk
145717ea1177Swdenk		The address of PHY on MII bus.
145817ea1177Swdenk
145917ea1177Swdenk		CONFIG_PHY_CLOCK_FREQ (ppc4xx)
146017ea1177Swdenk
146117ea1177Swdenk		The clock frequency of the MII bus
146217ea1177Swdenk
146317ea1177Swdenk		CONFIG_PHY_GIGE
146417ea1177Swdenk
146517ea1177Swdenk		If this option is set, support for speed/duplex
146611ccc33fSMarcel Ziswiler		detection of gigabit PHY is included.
146717ea1177Swdenk
146817ea1177Swdenk		CONFIG_PHY_RESET_DELAY
146917ea1177Swdenk
147017ea1177Swdenk		Some PHY like Intel LXT971A need extra delay after
147117ea1177Swdenk		reset before any MII register access is possible.
147217ea1177Swdenk		For such PHY, set this option to the usec delay
147317ea1177Swdenk		required. (minimum 300usec for LXT971A)
147417ea1177Swdenk
147517ea1177Swdenk		CONFIG_PHY_CMD_DELAY (ppc4xx)
147617ea1177Swdenk
147717ea1177Swdenk		Some PHY like Intel LXT971A need extra delay after
147817ea1177Swdenk		command issued before MII status register can be read
147917ea1177Swdenk
1480c609719bSwdenk- Ethernet address:
1481c609719bSwdenk		CONFIG_ETHADDR
1482c68a05feSrichardretanubun		CONFIG_ETH1ADDR
1483c609719bSwdenk		CONFIG_ETH2ADDR
1484c609719bSwdenk		CONFIG_ETH3ADDR
1485c68a05feSrichardretanubun		CONFIG_ETH4ADDR
1486c68a05feSrichardretanubun		CONFIG_ETH5ADDR
1487c609719bSwdenk
148811ccc33fSMarcel Ziswiler		Define a default value for Ethernet address to use
148911ccc33fSMarcel Ziswiler		for the respective Ethernet interface, in case this
1490c609719bSwdenk		is not determined automatically.
1491c609719bSwdenk
1492c609719bSwdenk- IP address:
1493c609719bSwdenk		CONFIG_IPADDR
1494c609719bSwdenk
1495c609719bSwdenk		Define a default value for the IP address to use for
149611ccc33fSMarcel Ziswiler		the default Ethernet interface, in case this is not
1497c609719bSwdenk		determined through e.g. bootp.
14981ebcd654SWolfgang Denk		(Environment variable "ipaddr")
1499c609719bSwdenk
1500c609719bSwdenk- Server IP address:
1501c609719bSwdenk		CONFIG_SERVERIP
1502c609719bSwdenk
1503c609719bSwdenk		Defines a default value for the IP address of a TFTP
1504c609719bSwdenk		server to contact when using the "tftboot" command.
15051ebcd654SWolfgang Denk		(Environment variable "serverip")
1506c609719bSwdenk
150797cfe861SRobin Getz		CONFIG_KEEP_SERVERADDR
150897cfe861SRobin Getz
150997cfe861SRobin Getz		Keeps the server's MAC address, in the env 'serveraddr'
151097cfe861SRobin Getz		for passing to bootargs (like Linux's netconsole option)
151197cfe861SRobin Getz
15121ebcd654SWolfgang Denk- Gateway IP address:
15131ebcd654SWolfgang Denk		CONFIG_GATEWAYIP
15141ebcd654SWolfgang Denk
15151ebcd654SWolfgang Denk		Defines a default value for the IP address of the
15161ebcd654SWolfgang Denk		default router where packets to other networks are
15171ebcd654SWolfgang Denk		sent to.
15181ebcd654SWolfgang Denk		(Environment variable "gatewayip")
15191ebcd654SWolfgang Denk
15201ebcd654SWolfgang Denk- Subnet mask:
15211ebcd654SWolfgang Denk		CONFIG_NETMASK
15221ebcd654SWolfgang Denk
15231ebcd654SWolfgang Denk		Defines a default value for the subnet mask (or
15241ebcd654SWolfgang Denk		routing prefix) which is used to determine if an IP
15251ebcd654SWolfgang Denk		address belongs to the local subnet or needs to be
15261ebcd654SWolfgang Denk		forwarded through a router.
15271ebcd654SWolfgang Denk		(Environment variable "netmask")
15281ebcd654SWolfgang Denk
152953a5c424SDavid Updegraff- Multicast TFTP Mode:
153053a5c424SDavid Updegraff		CONFIG_MCAST_TFTP
153153a5c424SDavid Updegraff
153253a5c424SDavid Updegraff		Defines whether you want to support multicast TFTP as per
153353a5c424SDavid Updegraff		rfc-2090; for example to work with atftp.  Lets lots of targets
153411ccc33fSMarcel Ziswiler		tftp down the same boot image concurrently.  Note: the Ethernet
153553a5c424SDavid Updegraff		driver in use must provide a function: mcast() to join/leave a
153653a5c424SDavid Updegraff		multicast group.
153753a5c424SDavid Updegraff
1538c609719bSwdenk- BOOTP Recovery Mode:
1539c609719bSwdenk		CONFIG_BOOTP_RANDOM_DELAY
1540c609719bSwdenk
1541c609719bSwdenk		If you have many targets in a network that try to
1542c609719bSwdenk		boot using BOOTP, you may want to avoid that all
1543c609719bSwdenk		systems send out BOOTP requests at precisely the same
1544c609719bSwdenk		moment (which would happen for instance at recovery
1545c609719bSwdenk		from a power failure, when all systems will try to
1546c609719bSwdenk		boot, thus flooding the BOOTP server. Defining
1547c609719bSwdenk		CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be
1548c609719bSwdenk		inserted before sending out BOOTP requests. The
15496c33c785SWolfgang Denk		following delays are inserted then:
1550c609719bSwdenk
1551c609719bSwdenk		1st BOOTP request:	delay 0 ... 1 sec
1552c609719bSwdenk		2nd BOOTP request:	delay 0 ... 2 sec
1553c609719bSwdenk		3rd BOOTP request:	delay 0 ... 4 sec
1554c609719bSwdenk		4th and following
1555c609719bSwdenk		BOOTP requests:		delay 0 ... 8 sec
1556c609719bSwdenk
1557fe389a82Sstroese- DHCP Advanced Options:
15581fe80d79SJon Loeliger		You can fine tune the DHCP functionality by defining
15591fe80d79SJon Loeliger		CONFIG_BOOTP_* symbols:
1560fe389a82Sstroese
15611fe80d79SJon Loeliger		CONFIG_BOOTP_SUBNETMASK
15621fe80d79SJon Loeliger		CONFIG_BOOTP_GATEWAY
15631fe80d79SJon Loeliger		CONFIG_BOOTP_HOSTNAME
15641fe80d79SJon Loeliger		CONFIG_BOOTP_NISDOMAIN
15651fe80d79SJon Loeliger		CONFIG_BOOTP_BOOTPATH
15661fe80d79SJon Loeliger		CONFIG_BOOTP_BOOTFILESIZE
15671fe80d79SJon Loeliger		CONFIG_BOOTP_DNS
15681fe80d79SJon Loeliger		CONFIG_BOOTP_DNS2
15691fe80d79SJon Loeliger		CONFIG_BOOTP_SEND_HOSTNAME
15701fe80d79SJon Loeliger		CONFIG_BOOTP_NTPSERVER
15711fe80d79SJon Loeliger		CONFIG_BOOTP_TIMEOFFSET
15721fe80d79SJon Loeliger		CONFIG_BOOTP_VENDOREX
1573fe389a82Sstroese
15745d110f0aSWilson Callan		CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip
15755d110f0aSWilson Callan		environment variable, not the BOOTP server.
1576fe389a82Sstroese
1577fe389a82Sstroese		CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS
1578fe389a82Sstroese		serverip from a DHCP server, it is possible that more
1579fe389a82Sstroese		than one DNS serverip is offered to the client.
1580fe389a82Sstroese		If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS
1581fe389a82Sstroese		serverip will be stored in the additional environment
1582fe389a82Sstroese		variable "dnsip2". The first DNS serverip is always
1583fe389a82Sstroese		stored in the variable "dnsip", when CONFIG_BOOTP_DNS
15841fe80d79SJon Loeliger		is defined.
1585fe389a82Sstroese
1586fe389a82Sstroese		CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable
1587fe389a82Sstroese		to do a dynamic update of a DNS server. To do this, they
1588fe389a82Sstroese		need the hostname of the DHCP requester.
15895d110f0aSWilson Callan		If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content
15901fe80d79SJon Loeliger		of the "hostname" environment variable is passed as
15911fe80d79SJon Loeliger		option 12 to the DHCP server.
1592fe389a82Sstroese
1593d9a2f416SAras Vaichas		CONFIG_BOOTP_DHCP_REQUEST_DELAY
1594d9a2f416SAras Vaichas
1595d9a2f416SAras Vaichas		A 32bit value in microseconds for a delay between
1596d9a2f416SAras Vaichas		receiving a "DHCP Offer" and sending the "DHCP Request".
1597d9a2f416SAras Vaichas		This fixes a problem with certain DHCP servers that don't
1598d9a2f416SAras Vaichas		respond 100% of the time to a "DHCP request". E.g. On an
1599d9a2f416SAras Vaichas		AT91RM9200 processor running at 180MHz, this delay needed
1600d9a2f416SAras Vaichas		to be *at least* 15,000 usec before a Windows Server 2003
1601d9a2f416SAras Vaichas		DHCP server would reply 100% of the time. I recommend at
1602d9a2f416SAras Vaichas		least 50,000 usec to be safe. The alternative is to hope
1603d9a2f416SAras Vaichas		that one of the retries will be successful but note that
1604d9a2f416SAras Vaichas		the DHCP timeout and retry process takes a longer than
1605d9a2f416SAras Vaichas		this delay.
1606d9a2f416SAras Vaichas
1607a3d991bdSwdenk - CDP Options:
1608a3d991bdSwdenk		CONFIG_CDP_DEVICE_ID
1609a3d991bdSwdenk
1610a3d991bdSwdenk		The device id used in CDP trigger frames.
1611a3d991bdSwdenk
1612a3d991bdSwdenk		CONFIG_CDP_DEVICE_ID_PREFIX
1613a3d991bdSwdenk
1614a3d991bdSwdenk		A two character string which is prefixed to the MAC address
1615a3d991bdSwdenk		of the device.
1616a3d991bdSwdenk
1617a3d991bdSwdenk		CONFIG_CDP_PORT_ID
1618a3d991bdSwdenk
1619a3d991bdSwdenk		A printf format string which contains the ascii name of
1620a3d991bdSwdenk		the port. Normally is set to "eth%d" which sets
162111ccc33fSMarcel Ziswiler		eth0 for the first Ethernet, eth1 for the second etc.
1622a3d991bdSwdenk
1623a3d991bdSwdenk		CONFIG_CDP_CAPABILITIES
1624a3d991bdSwdenk
1625a3d991bdSwdenk		A 32bit integer which indicates the device capabilities;
1626a3d991bdSwdenk		0x00000010 for a normal host which does not forwards.
1627a3d991bdSwdenk
1628a3d991bdSwdenk		CONFIG_CDP_VERSION
1629a3d991bdSwdenk
1630a3d991bdSwdenk		An ascii string containing the version of the software.
1631a3d991bdSwdenk
1632a3d991bdSwdenk		CONFIG_CDP_PLATFORM
1633a3d991bdSwdenk
1634a3d991bdSwdenk		An ascii string containing the name of the platform.
1635a3d991bdSwdenk
1636a3d991bdSwdenk		CONFIG_CDP_TRIGGER
1637a3d991bdSwdenk
1638a3d991bdSwdenk		A 32bit integer sent on the trigger.
1639a3d991bdSwdenk
1640a3d991bdSwdenk		CONFIG_CDP_POWER_CONSUMPTION
1641a3d991bdSwdenk
1642a3d991bdSwdenk		A 16bit integer containing the power consumption of the
1643a3d991bdSwdenk		device in .1 of milliwatts.
1644a3d991bdSwdenk
1645a3d991bdSwdenk		CONFIG_CDP_APPLIANCE_VLAN_TYPE
1646a3d991bdSwdenk
1647a3d991bdSwdenk		A byte containing the id of the VLAN.
1648a3d991bdSwdenk
1649c609719bSwdenk- Status LED:	CONFIG_STATUS_LED
1650c609719bSwdenk
1651c609719bSwdenk		Several configurations allow to display the current
1652c609719bSwdenk		status using a LED. For instance, the LED will blink
1653c609719bSwdenk		fast while running U-Boot code, stop blinking as
1654c609719bSwdenk		soon as a reply to a BOOTP request was received, and
1655c609719bSwdenk		start blinking slow once the Linux kernel is running
1656c609719bSwdenk		(supported by a status LED driver in the Linux
1657c609719bSwdenk		kernel). Defining CONFIG_STATUS_LED enables this
1658c609719bSwdenk		feature in U-Boot.
1659c609719bSwdenk
1660c609719bSwdenk- CAN Support:	CONFIG_CAN_DRIVER
1661c609719bSwdenk
1662c609719bSwdenk		Defining CONFIG_CAN_DRIVER enables CAN driver support
1663c609719bSwdenk		on those systems that support this (optional)
1664c609719bSwdenk		feature, like the TQM8xxL modules.
1665c609719bSwdenk
1666c609719bSwdenk- I2C Support:	CONFIG_HARD_I2C | CONFIG_SOFT_I2C
1667c609719bSwdenk
1668b37c7e5eSwdenk		These enable I2C serial bus commands. Defining either of
1669b37c7e5eSwdenk		(but not both of) CONFIG_HARD_I2C or CONFIG_SOFT_I2C will
167011ccc33fSMarcel Ziswiler		include the appropriate I2C driver for the selected CPU.
1671c609719bSwdenk
1672b37c7e5eSwdenk		This will allow you to use i2c commands at the u-boot
1673602ad3b3SJon Loeliger		command line (as long as you set CONFIG_CMD_I2C in
1674b37c7e5eSwdenk		CONFIG_COMMANDS) and communicate with i2c based realtime
1675b37c7e5eSwdenk		clock chips. See common/cmd_i2c.c for a description of the
1676c609719bSwdenk		command line interface.
1677c609719bSwdenk
1678bb99ad6dSBen Warren		CONFIG_HARD_I2C selects a hardware I2C controller.
1679c609719bSwdenk
1680b37c7e5eSwdenk		CONFIG_SOFT_I2C configures u-boot to use a software (aka
1681b37c7e5eSwdenk		bit-banging) driver instead of CPM or similar hardware
1682b37c7e5eSwdenk		support for I2C.
1683c609719bSwdenk
1684b37c7e5eSwdenk		There are several other quantities that must also be
1685b37c7e5eSwdenk		defined when you define CONFIG_HARD_I2C or CONFIG_SOFT_I2C.
1686c609719bSwdenk
16876d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		In both cases you will need to define CONFIG_SYS_I2C_SPEED
1688b37c7e5eSwdenk		to be the frequency (in Hz) at which you wish your i2c bus
16896d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		to run and CONFIG_SYS_I2C_SLAVE to be the address of this node (ie
169011ccc33fSMarcel Ziswiler		the CPU's i2c node address).
1691c609719bSwdenk
16928d321b81SPeter Tyser		Now, the u-boot i2c code for the mpc8xx
1693a47a12beSStefan Roese		(arch/powerpc/cpu/mpc8xx/i2c.c) sets the CPU up as a master node
16948d321b81SPeter Tyser		and so its address should therefore be cleared to 0 (See,
16958d321b81SPeter Tyser		eg, MPC823e User's Manual p.16-473). So, set
16968d321b81SPeter Tyser		CONFIG_SYS_I2C_SLAVE to 0.
1697b37c7e5eSwdenk
16985da71efaSEric Millbrandt		CONFIG_SYS_I2C_INIT_MPC5XXX
16995da71efaSEric Millbrandt
17005da71efaSEric Millbrandt		When a board is reset during an i2c bus transfer
17015da71efaSEric Millbrandt		chips might think that the current transfer is still
17025da71efaSEric Millbrandt		in progress.  Reset the slave devices by sending start
17035da71efaSEric Millbrandt		commands until the slave device responds.
17045da71efaSEric Millbrandt
1705b37c7e5eSwdenk		That's all that's required for CONFIG_HARD_I2C.
1706b37c7e5eSwdenk
1707b37c7e5eSwdenk		If you use the software i2c interface (CONFIG_SOFT_I2C)
1708b37c7e5eSwdenk		then the following macros need to be defined (examples are
1709b37c7e5eSwdenk		from include/configs/lwmon.h):
1710c609719bSwdenk
1711c609719bSwdenk		I2C_INIT
1712c609719bSwdenk
1713b37c7e5eSwdenk		(Optional). Any commands necessary to enable the I2C
1714c609719bSwdenk		controller or configure ports.
1715c609719bSwdenk
1716b37c7e5eSwdenk		eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |=	PB_SCL)
1717b37c7e5eSwdenk
1718c609719bSwdenk		I2C_PORT
1719c609719bSwdenk
1720c609719bSwdenk		(Only for MPC8260 CPU). The I/O port to use (the code
1721c609719bSwdenk		assumes both bits are on the same port). Valid values
1722c609719bSwdenk		are 0..3 for ports A..D.
1723c609719bSwdenk
1724c609719bSwdenk		I2C_ACTIVE
1725c609719bSwdenk
1726c609719bSwdenk		The code necessary to make the I2C data line active
1727c609719bSwdenk		(driven).  If the data line is open collector, this
1728c609719bSwdenk		define can be null.
1729c609719bSwdenk
1730b37c7e5eSwdenk		eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |=  PB_SDA)
1731b37c7e5eSwdenk
1732c609719bSwdenk		I2C_TRISTATE
1733c609719bSwdenk
1734c609719bSwdenk		The code necessary to make the I2C data line tri-stated
1735c609719bSwdenk		(inactive).  If the data line is open collector, this
1736c609719bSwdenk		define can be null.
1737c609719bSwdenk
1738b37c7e5eSwdenk		eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA)
1739b37c7e5eSwdenk
1740c609719bSwdenk		I2C_READ
1741c609719bSwdenk
1742c609719bSwdenk		Code that returns TRUE if the I2C data line is high,
1743c609719bSwdenk		FALSE if it is low.
1744c609719bSwdenk
1745b37c7e5eSwdenk		eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0)
1746b37c7e5eSwdenk
1747c609719bSwdenk		I2C_SDA(bit)
1748c609719bSwdenk
1749c609719bSwdenk		If <bit> is TRUE, sets the I2C data line high. If it
1750c609719bSwdenk		is FALSE, it clears it (low).
1751c609719bSwdenk
1752b37c7e5eSwdenk		eg: #define I2C_SDA(bit) \
1753b37c7e5eSwdenk			if(bit) immr->im_cpm.cp_pbdat |=  PB_SDA; \
1754b37c7e5eSwdenk			else	immr->im_cpm.cp_pbdat &= ~PB_SDA
1755b37c7e5eSwdenk
1756c609719bSwdenk		I2C_SCL(bit)
1757c609719bSwdenk
1758c609719bSwdenk		If <bit> is TRUE, sets the I2C clock line high. If it
1759c609719bSwdenk		is FALSE, it clears it (low).
1760c609719bSwdenk
1761b37c7e5eSwdenk		eg: #define I2C_SCL(bit) \
1762b37c7e5eSwdenk			if(bit) immr->im_cpm.cp_pbdat |=  PB_SCL; \
1763b37c7e5eSwdenk			else	immr->im_cpm.cp_pbdat &= ~PB_SCL
1764b37c7e5eSwdenk
1765c609719bSwdenk		I2C_DELAY
1766c609719bSwdenk
1767c609719bSwdenk		This delay is invoked four times per clock cycle so this
1768c609719bSwdenk		controls the rate of data transfer.  The data rate thus
1769b37c7e5eSwdenk		is 1 / (I2C_DELAY * 4). Often defined to be something
1770b37c7e5eSwdenk		like:
1771b37c7e5eSwdenk
1772b37c7e5eSwdenk		#define I2C_DELAY  udelay(2)
1773c609719bSwdenk
1774793b5726SMike Frysinger		CONFIG_SOFT_I2C_GPIO_SCL / CONFIG_SOFT_I2C_GPIO_SDA
1775793b5726SMike Frysinger
1776793b5726SMike Frysinger		If your arch supports the generic GPIO framework (asm/gpio.h),
1777793b5726SMike Frysinger		then you may alternatively define the two GPIOs that are to be
1778793b5726SMike Frysinger		used as SCL / SDA.  Any of the previous I2C_xxx macros will
1779793b5726SMike Frysinger		have GPIO-based defaults assigned to them as appropriate.
1780793b5726SMike Frysinger
1781793b5726SMike Frysinger		You should define these to the GPIO value as given directly to
1782793b5726SMike Frysinger		the generic GPIO functions.
1783793b5726SMike Frysinger
17846d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_INIT_BOARD
178547cd00faSwdenk
178647cd00faSwdenk		When a board is reset during an i2c bus transfer
178747cd00faSwdenk		chips might think that the current transfer is still
178847cd00faSwdenk		in progress. On some boards it is possible to access
178947cd00faSwdenk		the i2c SCLK line directly, either by using the
179047cd00faSwdenk		processor pin as a GPIO or by having a second pin
179147cd00faSwdenk		connected to the bus. If this option is defined a
179247cd00faSwdenk		custom i2c_init_board() routine in boards/xxx/board.c
179347cd00faSwdenk		is run early in the boot sequence.
179447cd00faSwdenk
179526a33504SRichard Retanubun		CONFIG_SYS_I2C_BOARD_LATE_INIT
179626a33504SRichard Retanubun
179726a33504SRichard Retanubun		An alternative to CONFIG_SYS_I2C_INIT_BOARD. If this option is
179826a33504SRichard Retanubun		defined a custom i2c_board_late_init() routine in
179926a33504SRichard Retanubun		boards/xxx/board.c is run AFTER the operations in i2c_init()
180026a33504SRichard Retanubun		is completed. This callpoint can be used to unreset i2c bus
180126a33504SRichard Retanubun		using CPU i2c controller register accesses for CPUs whose i2c
180226a33504SRichard Retanubun		controller provide such a method. It is called at the end of
180326a33504SRichard Retanubun		i2c_init() to allow i2c_init operations to setup the i2c bus
180426a33504SRichard Retanubun		controller on the CPU (e.g. setting bus speed & slave address).
180526a33504SRichard Retanubun
180617ea1177Swdenk		CONFIG_I2CFAST (PPC405GP|PPC405EP only)
180717ea1177Swdenk
180817ea1177Swdenk		This option enables configuration of bi_iic_fast[] flags
180917ea1177Swdenk		in u-boot bd_info structure based on u-boot environment
181017ea1177Swdenk		variable "i2cfast". (see also i2cfast)
181117ea1177Swdenk
1812bb99ad6dSBen Warren		CONFIG_I2C_MULTI_BUS
1813bb99ad6dSBen Warren
1814bb99ad6dSBen Warren		This option allows the use of multiple I2C buses, each of which
1815bb99ad6dSBen Warren		must have a controller.	 At any point in time, only one bus is
1816bb99ad6dSBen Warren		active.	 To switch to a different bus, use the 'i2c dev' command.
1817bb99ad6dSBen Warren		Note that bus numbering is zero-based.
1818bb99ad6dSBen Warren
18196d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_NOPROBES
1820bb99ad6dSBen Warren
1821bb99ad6dSBen Warren		This option specifies a list of I2C devices that will be skipped
18220f89c54bSPeter Tyser		when the 'i2c probe' command is issued.	 If CONFIG_I2C_MULTI_BUS
18230f89c54bSPeter Tyser		is set, specify a list of bus-device pairs.  Otherwise, specify
18240f89c54bSPeter Tyser		a 1D array of device addresses
1825bb99ad6dSBen Warren
1826bb99ad6dSBen Warren		e.g.
1827bb99ad6dSBen Warren			#undef	CONFIG_I2C_MULTI_BUS
18286d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			#define CONFIG_SYS_I2C_NOPROBES {0x50,0x68}
1829bb99ad6dSBen Warren
1830bb99ad6dSBen Warren		will skip addresses 0x50 and 0x68 on a board with one I2C bus
1831bb99ad6dSBen Warren
1832bb99ad6dSBen Warren			#define CONFIG_I2C_MULTI_BUS
18336d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			#define CONFIG_SYS_I2C_MULTI_NOPROBES	{{0,0x50},{0,0x68},{1,0x54}}
1834bb99ad6dSBen Warren
1835bb99ad6dSBen Warren		will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1
1836bb99ad6dSBen Warren
18376d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SPD_BUS_NUM
1838be5e6181STimur Tabi
1839be5e6181STimur Tabi		If defined, then this indicates the I2C bus number for DDR SPD.
1840be5e6181STimur Tabi		If not defined, then U-Boot assumes that SPD is on I2C bus 0.
1841be5e6181STimur Tabi
18426d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_RTC_BUS_NUM
18430dc018ecSStefan Roese
18440dc018ecSStefan Roese		If defined, then this indicates the I2C bus number for the RTC.
18450dc018ecSStefan Roese		If not defined, then U-Boot assumes that RTC is on I2C bus 0.
18460dc018ecSStefan Roese
18476d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_DTT_BUS_NUM
18480dc018ecSStefan Roese
18490dc018ecSStefan Roese		If defined, then this indicates the I2C bus number for the DTT.
18500dc018ecSStefan Roese		If not defined, then U-Boot assumes that DTT is on I2C bus 0.
18510dc018ecSStefan Roese
18526d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_DTT_ADDR:
18539ebbb54fSVictor Gallardo
18549ebbb54fSVictor Gallardo		If defined, specifies the I2C address of the DTT device.
18559ebbb54fSVictor Gallardo		If not defined, then U-Boot uses predefined value for
18569ebbb54fSVictor Gallardo		specified DTT device.
18579ebbb54fSVictor Gallardo
1858be5e6181STimur Tabi		CONFIG_FSL_I2C
1859be5e6181STimur Tabi
1860be5e6181STimur Tabi		Define this option if you want to use Freescale's I2C driver in
18617817cb20SMarcel Ziswiler		drivers/i2c/fsl_i2c.c.
1862be5e6181STimur Tabi
186367b23a32SHeiko Schocher		CONFIG_I2C_MUX
186467b23a32SHeiko Schocher
186567b23a32SHeiko Schocher		Define this option if you have I2C devices reached over 1 .. n
186667b23a32SHeiko Schocher		I2C Muxes like the pca9544a. This option addes a new I2C
186767b23a32SHeiko Schocher		Command "i2c bus [muxtype:muxaddr:muxchannel]" which adds a
186867b23a32SHeiko Schocher		new I2C Bus to the existing I2C Busses. If you select the
186967b23a32SHeiko Schocher		new Bus with "i2c dev", u-bbot sends first the commandos for
187067b23a32SHeiko Schocher		the muxes to activate this new "bus".
187167b23a32SHeiko Schocher
187267b23a32SHeiko Schocher		CONFIG_I2C_MULTI_BUS must be also defined, to use this
187367b23a32SHeiko Schocher		feature!
187467b23a32SHeiko Schocher
187567b23a32SHeiko Schocher		Example:
187667b23a32SHeiko Schocher		Adding a new I2C Bus reached over 2 pca9544a muxes
187767b23a32SHeiko Schocher			The First mux with address 70 and channel 6
187867b23a32SHeiko Schocher			The Second mux with address 71 and channel 4
187967b23a32SHeiko Schocher
188067b23a32SHeiko Schocher		=> i2c bus pca9544a:70:6:pca9544a:71:4
188167b23a32SHeiko Schocher
188267b23a32SHeiko Schocher		Use the "i2c bus" command without parameter, to get a list
188367b23a32SHeiko Schocher		of I2C Busses with muxes:
188467b23a32SHeiko Schocher
188567b23a32SHeiko Schocher		=> i2c bus
188667b23a32SHeiko Schocher		Busses reached over muxes:
188767b23a32SHeiko Schocher		Bus ID: 2
188867b23a32SHeiko Schocher		  reached over Mux(es):
188967b23a32SHeiko Schocher		    pca9544a@70 ch: 4
189067b23a32SHeiko Schocher		Bus ID: 3
189167b23a32SHeiko Schocher		  reached over Mux(es):
189267b23a32SHeiko Schocher		    pca9544a@70 ch: 6
189367b23a32SHeiko Schocher		    pca9544a@71 ch: 4
189467b23a32SHeiko Schocher		=>
189567b23a32SHeiko Schocher
189667b23a32SHeiko Schocher		If you now switch to the new I2C Bus 3 with "i2c dev 3"
1897f9a78b8dSMichael Jones		u-boot first sends the command to the mux@70 to enable
1898f9a78b8dSMichael Jones		channel 6, and then the command to the mux@71 to enable
189967b23a32SHeiko Schocher		the channel 4.
190067b23a32SHeiko Schocher
190167b23a32SHeiko Schocher		After that, you can use the "normal" i2c commands as
1902f9a78b8dSMichael Jones		usual to communicate with your I2C devices behind
190367b23a32SHeiko Schocher		the 2 muxes.
190467b23a32SHeiko Schocher
190567b23a32SHeiko Schocher		This option is actually implemented for the bitbanging
190667b23a32SHeiko Schocher		algorithm in common/soft_i2c.c and for the Hardware I2C
190767b23a32SHeiko Schocher		Bus on the MPC8260. But it should be not so difficult
190867b23a32SHeiko Schocher		to add this option to other architectures.
190967b23a32SHeiko Schocher
19102ac6985aSAndrew Dyer		CONFIG_SOFT_I2C_READ_REPEATED_START
19112ac6985aSAndrew Dyer
19122ac6985aSAndrew Dyer		defining this will force the i2c_read() function in
19132ac6985aSAndrew Dyer		the soft_i2c driver to perform an I2C repeated start
19142ac6985aSAndrew Dyer		between writing the address pointer and reading the
19152ac6985aSAndrew Dyer		data.  If this define is omitted the default behaviour
19162ac6985aSAndrew Dyer		of doing a stop-start sequence will be used.  Most I2C
19172ac6985aSAndrew Dyer		devices can use either method, but some require one or
19182ac6985aSAndrew Dyer		the other.
1919be5e6181STimur Tabi
1920c609719bSwdenk- SPI Support:	CONFIG_SPI
1921c609719bSwdenk
1922c609719bSwdenk		Enables SPI driver (so far only tested with
1923c609719bSwdenk		SPI EEPROM, also an instance works with Crystal A/D and
1924c609719bSwdenk		D/As on the SACSng board)
1925c609719bSwdenk
19266639562eSYoshihiro Shimoda		CONFIG_SH_SPI
19276639562eSYoshihiro Shimoda
19286639562eSYoshihiro Shimoda		Enables the driver for SPI controller on SuperH. Currently
19296639562eSYoshihiro Shimoda		only SH7757 is supported.
19306639562eSYoshihiro Shimoda
1931c609719bSwdenk		CONFIG_SPI_X
1932c609719bSwdenk
1933c609719bSwdenk		Enables extended (16-bit) SPI EEPROM addressing.
1934c609719bSwdenk		(symmetrical to CONFIG_I2C_X)
1935c609719bSwdenk
1936c609719bSwdenk		CONFIG_SOFT_SPI
1937c609719bSwdenk
1938c609719bSwdenk		Enables a software (bit-bang) SPI driver rather than
1939c609719bSwdenk		using hardware support. This is a general purpose
1940c609719bSwdenk		driver that only requires three general I/O port pins
1941c609719bSwdenk		(two outputs, one input) to function. If this is
1942c609719bSwdenk		defined, the board configuration must define several
1943c609719bSwdenk		SPI configuration items (port pins to use, etc). For
1944c609719bSwdenk		an example, see include/configs/sacsng.h.
1945c609719bSwdenk
194604a9e118SBen Warren		CONFIG_HARD_SPI
194704a9e118SBen Warren
194804a9e118SBen Warren		Enables a hardware SPI driver for general-purpose reads
194904a9e118SBen Warren		and writes.  As with CONFIG_SOFT_SPI, the board configuration
195004a9e118SBen Warren		must define a list of chip-select function pointers.
195104a9e118SBen Warren		Currently supported on some MPC8xxx processors.	 For an
195204a9e118SBen Warren		example, see include/configs/mpc8349emds.h.
195304a9e118SBen Warren
195438254f45SGuennadi Liakhovetski		CONFIG_MXC_SPI
195538254f45SGuennadi Liakhovetski
195638254f45SGuennadi Liakhovetski		Enables the driver for the SPI controllers on i.MX and MXC
19572e3cd1cdSFabio Estevam		SoCs. Currently i.MX31/35/51 are supported.
195838254f45SGuennadi Liakhovetski
19590133502eSMatthias Fuchs- FPGA Support: CONFIG_FPGA
19600133502eSMatthias Fuchs
19610133502eSMatthias Fuchs		Enables FPGA subsystem.
19620133502eSMatthias Fuchs
19630133502eSMatthias Fuchs		CONFIG_FPGA_<vendor>
19640133502eSMatthias Fuchs
19650133502eSMatthias Fuchs		Enables support for specific chip vendors.
19660133502eSMatthias Fuchs		(ALTERA, XILINX)
19670133502eSMatthias Fuchs
19680133502eSMatthias Fuchs		CONFIG_FPGA_<family>
19690133502eSMatthias Fuchs
19700133502eSMatthias Fuchs		Enables support for FPGA family.
19710133502eSMatthias Fuchs		(SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX)
19720133502eSMatthias Fuchs
19730133502eSMatthias Fuchs		CONFIG_FPGA_COUNT
1974c609719bSwdenk
1975c609719bSwdenk		Specify the number of FPGA devices to support.
1976c609719bSwdenk
19776d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_PROG_FEEDBACK
1978c609719bSwdenk
1979c609719bSwdenk		Enable printing of hash marks during FPGA configuration.
1980c609719bSwdenk
19816d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_BUSY
1982c609719bSwdenk
1983c609719bSwdenk		Enable checks on FPGA configuration interface busy
1984c609719bSwdenk		status by the configuration function. This option
1985c609719bSwdenk		will require a board or device specific function to
1986c609719bSwdenk		be written.
1987c609719bSwdenk
1988c609719bSwdenk		CONFIG_FPGA_DELAY
1989c609719bSwdenk
1990c609719bSwdenk		If defined, a function that provides delays in the FPGA
1991c609719bSwdenk		configuration driver.
1992c609719bSwdenk
19936d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_CTRLC
1994c609719bSwdenk		Allow Control-C to interrupt FPGA configuration
1995c609719bSwdenk
19966d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_ERROR
1997c609719bSwdenk
1998c609719bSwdenk		Check for configuration errors during FPGA bitfile
1999c609719bSwdenk		loading. For example, abort during Virtex II
2000c609719bSwdenk		configuration if the INIT_B line goes low (which
2001c609719bSwdenk		indicated a CRC error).
2002c609719bSwdenk
20036d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_INIT
2004c609719bSwdenk
2005c609719bSwdenk		Maximum time to wait for the INIT_B line to deassert
2006c609719bSwdenk		after PROB_B has been deasserted during a Virtex II
2007c609719bSwdenk		FPGA configuration sequence. The default time is 500
200811ccc33fSMarcel Ziswiler		ms.
2009c609719bSwdenk
20106d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_BUSY
2011c609719bSwdenk
2012c609719bSwdenk		Maximum time to wait for BUSY to deassert during
201311ccc33fSMarcel Ziswiler		Virtex II FPGA configuration. The default is 5 ms.
2014c609719bSwdenk
20156d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_CONFIG
2016c609719bSwdenk
2017c609719bSwdenk		Time to wait after FPGA configuration. The default is
201811ccc33fSMarcel Ziswiler		200 ms.
2019c609719bSwdenk
2020c609719bSwdenk- Configuration Management:
2021c609719bSwdenk		CONFIG_IDENT_STRING
2022c609719bSwdenk
2023c609719bSwdenk		If defined, this string will be added to the U-Boot
2024c609719bSwdenk		version information (U_BOOT_VERSION)
2025c609719bSwdenk
2026c609719bSwdenk- Vendor Parameter Protection:
2027c609719bSwdenk
2028c609719bSwdenk		U-Boot considers the values of the environment
2029c609719bSwdenk		variables "serial#" (Board Serial Number) and
20307152b1d0Swdenk		"ethaddr" (Ethernet Address) to be parameters that
2031c609719bSwdenk		are set once by the board vendor / manufacturer, and
2032c609719bSwdenk		protects these variables from casual modification by
2033c609719bSwdenk		the user. Once set, these variables are read-only,
2034c609719bSwdenk		and write or delete attempts are rejected. You can
203511ccc33fSMarcel Ziswiler		change this behaviour:
2036c609719bSwdenk
2037c609719bSwdenk		If CONFIG_ENV_OVERWRITE is #defined in your config
2038c609719bSwdenk		file, the write protection for vendor parameters is
203947cd00faSwdenk		completely disabled. Anybody can change or delete
2040c609719bSwdenk		these parameters.
2041c609719bSwdenk
2042c609719bSwdenk		Alternatively, if you #define _both_ CONFIG_ETHADDR
2043c609719bSwdenk		_and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default
204411ccc33fSMarcel Ziswiler		Ethernet address is installed in the environment,
2045c609719bSwdenk		which can be changed exactly ONCE by the user. [The
2046c609719bSwdenk		serial# is unaffected by this, i. e. it remains
2047c609719bSwdenk		read-only.]
2048c609719bSwdenk
2049c609719bSwdenk- Protected RAM:
2050c609719bSwdenk		CONFIG_PRAM
2051c609719bSwdenk
2052c609719bSwdenk		Define this variable to enable the reservation of
2053c609719bSwdenk		"protected RAM", i. e. RAM which is not overwritten
2054c609719bSwdenk		by U-Boot. Define CONFIG_PRAM to hold the number of
2055c609719bSwdenk		kB you want to reserve for pRAM. You can overwrite
2056c609719bSwdenk		this default value by defining an environment
2057c609719bSwdenk		variable "pram" to the number of kB you want to
2058c609719bSwdenk		reserve. Note that the board info structure will
2059c609719bSwdenk		still show the full amount of RAM. If pRAM is
2060c609719bSwdenk		reserved, a new environment variable "mem" will
2061c609719bSwdenk		automatically be defined to hold the amount of
2062c609719bSwdenk		remaining RAM in a form that can be passed as boot
2063c609719bSwdenk		argument to Linux, for instance like that:
2064c609719bSwdenk
2065fe126d8bSWolfgang Denk			setenv bootargs ... mem=\${mem}
2066c609719bSwdenk			saveenv
2067c609719bSwdenk
2068c609719bSwdenk		This way you can tell Linux not to use this memory,
2069c609719bSwdenk		either, which results in a memory region that will
2070c609719bSwdenk		not be affected by reboots.
2071c609719bSwdenk
2072c609719bSwdenk		*WARNING* If your board configuration uses automatic
2073c609719bSwdenk		detection of the RAM size, you must make sure that
2074c609719bSwdenk		this memory test is non-destructive. So far, the
2075c609719bSwdenk		following board configurations are known to be
2076c609719bSwdenk		"pRAM-clean":
2077c609719bSwdenk
2078c609719bSwdenk			ETX094, IVMS8, IVML24, SPD8xx, TQM8xxL,
2079c609719bSwdenk			HERMES, IP860, RPXlite, LWMON, LANTEC,
2080544d97e9SWolfgang Denk			FLAGADM, TQM8260
2081c609719bSwdenk
2082c609719bSwdenk- Error Recovery:
2083c609719bSwdenk		CONFIG_PANIC_HANG
2084c609719bSwdenk
2085c609719bSwdenk		Define this variable to stop the system in case of a
2086c609719bSwdenk		fatal error, so that you have to reset it manually.
2087c609719bSwdenk		This is probably NOT a good idea for an embedded
208811ccc33fSMarcel Ziswiler		system where you want the system to reboot
2089c609719bSwdenk		automatically as fast as possible, but it may be
2090c609719bSwdenk		useful during development since you can try to debug
2091c609719bSwdenk		the conditions that lead to the situation.
2092c609719bSwdenk
2093c609719bSwdenk		CONFIG_NET_RETRY_COUNT
2094c609719bSwdenk
2095c609719bSwdenk		This variable defines the number of retries for
2096c609719bSwdenk		network operations like ARP, RARP, TFTP, or BOOTP
2097c609719bSwdenk		before giving up the operation. If not defined, a
2098c609719bSwdenk		default value of 5 is used.
2099c609719bSwdenk
210040cb90eeSGuennadi Liakhovetski		CONFIG_ARP_TIMEOUT
210140cb90eeSGuennadi Liakhovetski
210240cb90eeSGuennadi Liakhovetski		Timeout waiting for an ARP reply in milliseconds.
210340cb90eeSGuennadi Liakhovetski
2104c609719bSwdenk- Command Interpreter:
21058078f1a5SWolfgang Denk		CONFIG_AUTO_COMPLETE
210604a85b3bSwdenk
210704a85b3bSwdenk		Enable auto completion of commands using TAB.
210804a85b3bSwdenk
21098078f1a5SWolfgang Denk		Note that this feature has NOT been implemented yet
21108078f1a5SWolfgang Denk		for the "hush" shell.
21118078f1a5SWolfgang Denk
21128078f1a5SWolfgang Denk
21136d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_HUSH_PARSER
2114c609719bSwdenk
2115c609719bSwdenk		Define this variable to enable the "hush" shell (from
2116c609719bSwdenk		Busybox) as command line interpreter, thus enabling
2117c609719bSwdenk		powerful command line syntax like
2118c609719bSwdenk		if...then...else...fi conditionals or `&&' and '||'
2119c609719bSwdenk		constructs ("shell scripts").
2120c609719bSwdenk
2121c609719bSwdenk		If undefined, you get the old, much simpler behaviour
2122c609719bSwdenk		with a somewhat smaller memory footprint.
2123c609719bSwdenk
2124c609719bSwdenk
21256d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_PROMPT_HUSH_PS2
2126c609719bSwdenk
2127c609719bSwdenk		This defines the secondary prompt string, which is
2128c609719bSwdenk		printed when the command interpreter needs more input
2129c609719bSwdenk		to complete a command. Usually "> ".
2130c609719bSwdenk
2131c609719bSwdenk	Note:
2132c609719bSwdenk
2133c609719bSwdenk		In the current implementation, the local variables
2134c609719bSwdenk		space and global environment variables space are
2135c609719bSwdenk		separated. Local variables are those you define by
21363b57fe0aSwdenk		simply typing `name=value'. To access a local
2137c609719bSwdenk		variable later on, you have write `$name' or
21383b57fe0aSwdenk		`${name}'; to execute the contents of a variable
21393b57fe0aSwdenk		directly type `$name' at the command prompt.
2140c609719bSwdenk
2141c609719bSwdenk		Global environment variables are those you use
2142c609719bSwdenk		setenv/printenv to work with. To run a command stored
2143c609719bSwdenk		in such a variable, you need to use the run command,
2144c609719bSwdenk		and you must not use the '$' sign to access them.
2145c609719bSwdenk
2146c609719bSwdenk		To store commands and special characters in a
2147c609719bSwdenk		variable, please use double quotation marks
2148c609719bSwdenk		surrounding the whole text of the variable, instead
2149c609719bSwdenk		of the backslashes before semicolons and special
2150c609719bSwdenk		symbols.
2151c609719bSwdenk
2152aa0c71acSWolfgang Denk- Commandline Editing and History:
2153aa0c71acSWolfgang Denk		CONFIG_CMDLINE_EDITING
2154aa0c71acSWolfgang Denk
215511ccc33fSMarcel Ziswiler		Enable editing and History functions for interactive
2156aa0c71acSWolfgang Denk		commandline input operations
2157aa0c71acSWolfgang Denk
2158a8c7c708Swdenk- Default Environment:
2159c609719bSwdenk		CONFIG_EXTRA_ENV_SETTINGS
2160c609719bSwdenk
2161c609719bSwdenk		Define this to contain any number of null terminated
2162c609719bSwdenk		strings (variable = value pairs) that will be part of
21637152b1d0Swdenk		the default environment compiled into the boot image.
21642262cfeeSwdenk
2165c609719bSwdenk		For example, place something like this in your
2166c609719bSwdenk		board's config file:
2167c609719bSwdenk
2168c609719bSwdenk		#define CONFIG_EXTRA_ENV_SETTINGS \
2169c609719bSwdenk			"myvar1=value1\0" \
2170c609719bSwdenk			"myvar2=value2\0"
2171c609719bSwdenk
2172c609719bSwdenk		Warning: This method is based on knowledge about the
2173c609719bSwdenk		internal format how the environment is stored by the
21742262cfeeSwdenk		U-Boot code. This is NOT an official, exported
2175c609719bSwdenk		interface! Although it is unlikely that this format
21767152b1d0Swdenk		will change soon, there is no guarantee either.
2177c609719bSwdenk		You better know what you are doing here.
2178c609719bSwdenk
2179c609719bSwdenk		Note: overly (ab)use of the default environment is
2180c609719bSwdenk		discouraged. Make sure to check other ways to preset
218174de7aefSWolfgang Denk		the environment like the "source" command or the
2182c609719bSwdenk		boot command first.
2183c609719bSwdenk
2184a8c7c708Swdenk- DataFlash Support:
21852abbe075Swdenk		CONFIG_HAS_DATAFLASH
21862abbe075Swdenk
21872abbe075Swdenk		Defining this option enables DataFlash features and
21882abbe075Swdenk		allows to read/write in Dataflash via the standard
21892abbe075Swdenk		commands cp, md...
21902abbe075Swdenk
21913f85ce27Swdenk- SystemACE Support:
21923f85ce27Swdenk		CONFIG_SYSTEMACE
21933f85ce27Swdenk
21943f85ce27Swdenk		Adding this option adds support for Xilinx SystemACE
21953f85ce27Swdenk		chips attached via some sort of local bus. The address
219611ccc33fSMarcel Ziswiler		of the chip must also be defined in the
21976d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SYSTEMACE_BASE macro. For example:
21983f85ce27Swdenk
21993f85ce27Swdenk		#define CONFIG_SYSTEMACE
22006d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		#define CONFIG_SYS_SYSTEMACE_BASE 0xf0000000
22013f85ce27Swdenk
22023f85ce27Swdenk		When SystemACE support is added, the "ace" device type
22033f85ce27Swdenk		becomes available to the fat commands, i.e. fatls.
22043f85ce27Swdenk
2205ecb0ccd9SWolfgang Denk- TFTP Fixed UDP Port:
2206ecb0ccd9SWolfgang Denk		CONFIG_TFTP_PORT
2207ecb0ccd9SWolfgang Denk
220828cb9375SWolfgang Denk		If this is defined, the environment variable tftpsrcp
2209ecb0ccd9SWolfgang Denk		is used to supply the TFTP UDP source port value.
221028cb9375SWolfgang Denk		If tftpsrcp isn't defined, the normal pseudo-random port
2211ecb0ccd9SWolfgang Denk		number generator is used.
2212ecb0ccd9SWolfgang Denk
221328cb9375SWolfgang Denk		Also, the environment variable tftpdstp is used to supply
221428cb9375SWolfgang Denk		the TFTP UDP destination port value.  If tftpdstp isn't
221528cb9375SWolfgang Denk		defined, the normal port 69 is used.
221628cb9375SWolfgang Denk
221728cb9375SWolfgang Denk		The purpose for tftpsrcp is to allow a TFTP server to
2218ecb0ccd9SWolfgang Denk		blindly start the TFTP transfer using the pre-configured
2219ecb0ccd9SWolfgang Denk		target IP address and UDP port. This has the effect of
2220ecb0ccd9SWolfgang Denk		"punching through" the (Windows XP) firewall, allowing
2221ecb0ccd9SWolfgang Denk		the remainder of the TFTP transfer to proceed normally.
2222ecb0ccd9SWolfgang Denk		A better solution is to properly configure the firewall,
2223ecb0ccd9SWolfgang Denk		but sometimes that is not allowed.
2224ecb0ccd9SWolfgang Denk
2225a8c7c708Swdenk- Show boot progress:
2226c609719bSwdenk		CONFIG_SHOW_BOOT_PROGRESS
2227c609719bSwdenk
2228c609719bSwdenk		Defining this option allows to add some board-
2229c609719bSwdenk		specific code (calling a user-provided function
2230c609719bSwdenk		"show_boot_progress(int)") that enables you to show
2231c609719bSwdenk		the system's boot progress on some display (for
2232c609719bSwdenk		example, some LED's) on your board. At the moment,
2233c609719bSwdenk		the following checkpoints are implemented:
2234c609719bSwdenk
22351372cce2SMarian BalakowiczLegacy uImage format:
22361372cce2SMarian Balakowicz
2237c609719bSwdenk  Arg	Where			When
2238c609719bSwdenk    1	common/cmd_bootm.c	before attempting to boot an image
2239c609719bSwdenk   -1	common/cmd_bootm.c	Image header has bad	 magic number
2240c609719bSwdenk    2	common/cmd_bootm.c	Image header has correct magic number
2241c609719bSwdenk   -2	common/cmd_bootm.c	Image header has bad	 checksum
2242c609719bSwdenk    3	common/cmd_bootm.c	Image header has correct checksum
2243c609719bSwdenk   -3	common/cmd_bootm.c	Image data   has bad	 checksum
2244c609719bSwdenk    4	common/cmd_bootm.c	Image data   has correct checksum
2245c609719bSwdenk   -4	common/cmd_bootm.c	Image is for unsupported architecture
2246c609719bSwdenk    5	common/cmd_bootm.c	Architecture check OK
22471372cce2SMarian Balakowicz   -5	common/cmd_bootm.c	Wrong Image Type (not kernel, multi)
2248c609719bSwdenk    6	common/cmd_bootm.c	Image Type check OK
2249c609719bSwdenk   -6	common/cmd_bootm.c	gunzip uncompression error
2250c609719bSwdenk   -7	common/cmd_bootm.c	Unimplemented compression type
2251c609719bSwdenk    7	common/cmd_bootm.c	Uncompression OK
22521372cce2SMarian Balakowicz    8	common/cmd_bootm.c	No uncompress/copy overwrite error
2253c609719bSwdenk   -9	common/cmd_bootm.c	Unsupported OS (not Linux, BSD, VxWorks, QNX)
22541372cce2SMarian Balakowicz
22551372cce2SMarian Balakowicz    9	common/image.c		Start initial ramdisk verification
22561372cce2SMarian Balakowicz  -10	common/image.c		Ramdisk header has bad	   magic number
22571372cce2SMarian Balakowicz  -11	common/image.c		Ramdisk header has bad	   checksum
22581372cce2SMarian Balakowicz   10	common/image.c		Ramdisk header is OK
22591372cce2SMarian Balakowicz  -12	common/image.c		Ramdisk data   has bad	   checksum
22601372cce2SMarian Balakowicz   11	common/image.c		Ramdisk data   has correct checksum
22611372cce2SMarian Balakowicz   12	common/image.c		Ramdisk verification complete, start loading
226211ccc33fSMarcel Ziswiler  -13	common/image.c		Wrong Image Type (not PPC Linux ramdisk)
22631372cce2SMarian Balakowicz   13	common/image.c		Start multifile image verification
22641372cce2SMarian Balakowicz   14	common/image.c		No initial ramdisk, no multifile, continue.
22651372cce2SMarian Balakowicz
2266ea0364f1SPeter Tyser   15	arch/<arch>/lib/bootm.c All preparation done, transferring control to OS
2267c609719bSwdenk
2268a47a12beSStefan Roese  -30	arch/powerpc/lib/board.c	Fatal error, hang the system
226963e73c9aSwdenk  -31	post/post.c		POST test failed, detected by post_output_backlog()
227063e73c9aSwdenk  -32	post/post.c		POST test failed, detected by post_run_single()
227163e73c9aSwdenk
2272566a494fSHeiko Schocher   34	common/cmd_doc.c	before loading a Image from a DOC device
2273566a494fSHeiko Schocher  -35	common/cmd_doc.c	Bad usage of "doc" command
2274566a494fSHeiko Schocher   35	common/cmd_doc.c	correct usage of "doc" command
2275566a494fSHeiko Schocher  -36	common/cmd_doc.c	No boot device
2276566a494fSHeiko Schocher   36	common/cmd_doc.c	correct boot device
2277566a494fSHeiko Schocher  -37	common/cmd_doc.c	Unknown Chip ID on boot device
2278566a494fSHeiko Schocher   37	common/cmd_doc.c	correct chip ID found, device available
2279566a494fSHeiko Schocher  -38	common/cmd_doc.c	Read Error on boot device
2280566a494fSHeiko Schocher   38	common/cmd_doc.c	reading Image header from DOC device OK
2281566a494fSHeiko Schocher  -39	common/cmd_doc.c	Image header has bad magic number
2282566a494fSHeiko Schocher   39	common/cmd_doc.c	Image header has correct magic number
2283566a494fSHeiko Schocher  -40	common/cmd_doc.c	Error reading Image from DOC device
2284566a494fSHeiko Schocher   40	common/cmd_doc.c	Image header has correct magic number
2285566a494fSHeiko Schocher   41	common/cmd_ide.c	before loading a Image from a IDE device
2286566a494fSHeiko Schocher  -42	common/cmd_ide.c	Bad usage of "ide" command
2287566a494fSHeiko Schocher   42	common/cmd_ide.c	correct usage of "ide" command
2288566a494fSHeiko Schocher  -43	common/cmd_ide.c	No boot device
2289566a494fSHeiko Schocher   43	common/cmd_ide.c	boot device found
2290566a494fSHeiko Schocher  -44	common/cmd_ide.c	Device not available
2291566a494fSHeiko Schocher   44	common/cmd_ide.c	Device available
2292566a494fSHeiko Schocher  -45	common/cmd_ide.c	wrong partition selected
2293566a494fSHeiko Schocher   45	common/cmd_ide.c	partition selected
2294566a494fSHeiko Schocher  -46	common/cmd_ide.c	Unknown partition table
2295566a494fSHeiko Schocher   46	common/cmd_ide.c	valid partition table found
2296566a494fSHeiko Schocher  -47	common/cmd_ide.c	Invalid partition type
2297566a494fSHeiko Schocher   47	common/cmd_ide.c	correct partition type
2298566a494fSHeiko Schocher  -48	common/cmd_ide.c	Error reading Image Header on boot device
2299566a494fSHeiko Schocher   48	common/cmd_ide.c	reading Image Header from IDE device OK
2300566a494fSHeiko Schocher  -49	common/cmd_ide.c	Image header has bad magic number
2301566a494fSHeiko Schocher   49	common/cmd_ide.c	Image header has correct magic number
2302566a494fSHeiko Schocher  -50	common/cmd_ide.c	Image header has bad	 checksum
2303566a494fSHeiko Schocher   50	common/cmd_ide.c	Image header has correct checksum
2304566a494fSHeiko Schocher  -51	common/cmd_ide.c	Error reading Image from IDE device
2305566a494fSHeiko Schocher   51	common/cmd_ide.c	reading Image from IDE device OK
2306566a494fSHeiko Schocher   52	common/cmd_nand.c	before loading a Image from a NAND device
2307566a494fSHeiko Schocher  -53	common/cmd_nand.c	Bad usage of "nand" command
2308566a494fSHeiko Schocher   53	common/cmd_nand.c	correct usage of "nand" command
2309566a494fSHeiko Schocher  -54	common/cmd_nand.c	No boot device
2310566a494fSHeiko Schocher   54	common/cmd_nand.c	boot device found
2311566a494fSHeiko Schocher  -55	common/cmd_nand.c	Unknown Chip ID on boot device
2312566a494fSHeiko Schocher   55	common/cmd_nand.c	correct chip ID found, device available
2313566a494fSHeiko Schocher  -56	common/cmd_nand.c	Error reading Image Header on boot device
2314566a494fSHeiko Schocher   56	common/cmd_nand.c	reading Image Header from NAND device OK
2315566a494fSHeiko Schocher  -57	common/cmd_nand.c	Image header has bad magic number
2316566a494fSHeiko Schocher   57	common/cmd_nand.c	Image header has correct magic number
2317566a494fSHeiko Schocher  -58	common/cmd_nand.c	Error reading Image from NAND device
2318566a494fSHeiko Schocher   58	common/cmd_nand.c	reading Image from NAND device OK
2319c609719bSwdenk
2320566a494fSHeiko Schocher  -60	common/env_common.c	Environment has a bad CRC, using default
2321c609719bSwdenk
2322566a494fSHeiko Schocher   64	net/eth.c		starting with Ethernet configuration.
2323566a494fSHeiko Schocher  -64	net/eth.c		no Ethernet found.
2324566a494fSHeiko Schocher   65	net/eth.c		Ethernet found.
2325206c60cbSwdenk
2326566a494fSHeiko Schocher  -80	common/cmd_net.c	usage wrong
2327566a494fSHeiko Schocher   80	common/cmd_net.c	before calling NetLoop()
232811ccc33fSMarcel Ziswiler  -81	common/cmd_net.c	some error in NetLoop() occurred
2329566a494fSHeiko Schocher   81	common/cmd_net.c	NetLoop() back without error
2330566a494fSHeiko Schocher  -82	common/cmd_net.c	size == 0 (File with size 0 loaded)
2331566a494fSHeiko Schocher   82	common/cmd_net.c	trying automatic boot
233274de7aefSWolfgang Denk   83	common/cmd_net.c	running "source" command
233374de7aefSWolfgang Denk  -83	common/cmd_net.c	some error in automatic boot or "source" command
2334566a494fSHeiko Schocher   84	common/cmd_net.c	end without errors
2335c609719bSwdenk
23361372cce2SMarian BalakowiczFIT uImage format:
23371372cce2SMarian Balakowicz
23381372cce2SMarian Balakowicz  Arg	Where			When
23391372cce2SMarian Balakowicz  100	common/cmd_bootm.c	Kernel FIT Image has correct format
23401372cce2SMarian Balakowicz -100	common/cmd_bootm.c	Kernel FIT Image has incorrect format
23411372cce2SMarian Balakowicz  101	common/cmd_bootm.c	No Kernel subimage unit name, using configuration
23421372cce2SMarian Balakowicz -101	common/cmd_bootm.c	Can't get configuration for kernel subimage
23431372cce2SMarian Balakowicz  102	common/cmd_bootm.c	Kernel unit name specified
23441372cce2SMarian Balakowicz -103	common/cmd_bootm.c	Can't get kernel subimage node offset
2345f773bea8SMarian Balakowicz  103	common/cmd_bootm.c	Found configuration node
23461372cce2SMarian Balakowicz  104	common/cmd_bootm.c	Got kernel subimage node offset
23471372cce2SMarian Balakowicz -104	common/cmd_bootm.c	Kernel subimage hash verification failed
23481372cce2SMarian Balakowicz  105	common/cmd_bootm.c	Kernel subimage hash verification OK
23491372cce2SMarian Balakowicz -105	common/cmd_bootm.c	Kernel subimage is for unsupported architecture
23501372cce2SMarian Balakowicz  106	common/cmd_bootm.c	Architecture check OK
235111ccc33fSMarcel Ziswiler -106	common/cmd_bootm.c	Kernel subimage has wrong type
235211ccc33fSMarcel Ziswiler  107	common/cmd_bootm.c	Kernel subimage type OK
23531372cce2SMarian Balakowicz -107	common/cmd_bootm.c	Can't get kernel subimage data/size
23541372cce2SMarian Balakowicz  108	common/cmd_bootm.c	Got kernel subimage data/size
23551372cce2SMarian Balakowicz -108	common/cmd_bootm.c	Wrong image type (not legacy, FIT)
23561372cce2SMarian Balakowicz -109	common/cmd_bootm.c	Can't get kernel subimage type
23571372cce2SMarian Balakowicz -110	common/cmd_bootm.c	Can't get kernel subimage comp
23581372cce2SMarian Balakowicz -111	common/cmd_bootm.c	Can't get kernel subimage os
23591372cce2SMarian Balakowicz -112	common/cmd_bootm.c	Can't get kernel subimage load address
23601372cce2SMarian Balakowicz -113	common/cmd_bootm.c	Image uncompress/copy overwrite error
23611372cce2SMarian Balakowicz
23621372cce2SMarian Balakowicz  120	common/image.c		Start initial ramdisk verification
23631372cce2SMarian Balakowicz -120	common/image.c		Ramdisk FIT image has incorrect format
23641372cce2SMarian Balakowicz  121	common/image.c		Ramdisk FIT image has correct format
236511ccc33fSMarcel Ziswiler  122	common/image.c		No ramdisk subimage unit name, using configuration
23661372cce2SMarian Balakowicz -122	common/image.c		Can't get configuration for ramdisk subimage
23671372cce2SMarian Balakowicz  123	common/image.c		Ramdisk unit name specified
23681372cce2SMarian Balakowicz -124	common/image.c		Can't get ramdisk subimage node offset
23691372cce2SMarian Balakowicz  125	common/image.c		Got ramdisk subimage node offset
23701372cce2SMarian Balakowicz -125	common/image.c		Ramdisk subimage hash verification failed
23711372cce2SMarian Balakowicz  126	common/image.c		Ramdisk subimage hash verification OK
23721372cce2SMarian Balakowicz -126	common/image.c		Ramdisk subimage for unsupported architecture
23731372cce2SMarian Balakowicz  127	common/image.c		Architecture check OK
23741372cce2SMarian Balakowicz -127	common/image.c		Can't get ramdisk subimage data/size
23751372cce2SMarian Balakowicz  128	common/image.c		Got ramdisk subimage data/size
23761372cce2SMarian Balakowicz  129	common/image.c		Can't get ramdisk load address
23771372cce2SMarian Balakowicz -129	common/image.c		Got ramdisk load address
23781372cce2SMarian Balakowicz
237911ccc33fSMarcel Ziswiler -130	common/cmd_doc.c	Incorrect FIT image format
23801372cce2SMarian Balakowicz  131	common/cmd_doc.c	FIT image format OK
23811372cce2SMarian Balakowicz
238211ccc33fSMarcel Ziswiler -140	common/cmd_ide.c	Incorrect FIT image format
23831372cce2SMarian Balakowicz  141	common/cmd_ide.c	FIT image format OK
23841372cce2SMarian Balakowicz
238511ccc33fSMarcel Ziswiler -150	common/cmd_nand.c	Incorrect FIT image format
23861372cce2SMarian Balakowicz  151	common/cmd_nand.c	FIT image format OK
23871372cce2SMarian Balakowicz
23884cf2609bSWolfgang Denk- Standalone program support:
23894cf2609bSWolfgang Denk		CONFIG_STANDALONE_LOAD_ADDR
23904cf2609bSWolfgang Denk
23916feff899SWolfgang Denk		This option defines a board specific value for the
23926feff899SWolfgang Denk		address where standalone program gets loaded, thus
23936feff899SWolfgang Denk		overwriting the architecture dependent default
23944cf2609bSWolfgang Denk		settings.
23954cf2609bSWolfgang Denk
23964cf2609bSWolfgang Denk- Frame Buffer Address:
23974cf2609bSWolfgang Denk		CONFIG_FB_ADDR
23984cf2609bSWolfgang Denk
23994cf2609bSWolfgang Denk		Define CONFIG_FB_ADDR if you want to use specific
24004cf2609bSWolfgang Denk		address for frame buffer.
24014cf2609bSWolfgang Denk		Then system will reserve the frame buffer address to
24024cf2609bSWolfgang Denk		defined address instead of lcd_setmem (this function
24036feff899SWolfgang Denk		grabs the memory for frame buffer by panel's size).
24044cf2609bSWolfgang Denk
24054cf2609bSWolfgang Denk		Please see board_init_f function.
24064cf2609bSWolfgang Denk
2407cccfc2abSDetlev Zundel- Automatic software updates via TFTP server
2408cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP
2409cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP_CNT_MAX
2410cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP_MSEC_MAX
2411cccfc2abSDetlev Zundel
2412cccfc2abSDetlev Zundel		These options enable and control the auto-update feature;
2413cccfc2abSDetlev Zundel		for a more detailed description refer to doc/README.update.
2414cccfc2abSDetlev Zundel
2415cccfc2abSDetlev Zundel- MTD Support (mtdparts command, UBI support)
2416cccfc2abSDetlev Zundel		CONFIG_MTD_DEVICE
2417cccfc2abSDetlev Zundel
2418cccfc2abSDetlev Zundel		Adds the MTD device infrastructure from the Linux kernel.
2419cccfc2abSDetlev Zundel		Needed for mtdparts command support.
2420cccfc2abSDetlev Zundel
2421cccfc2abSDetlev Zundel		CONFIG_MTD_PARTITIONS
2422cccfc2abSDetlev Zundel
2423cccfc2abSDetlev Zundel		Adds the MTD partitioning infrastructure from the Linux
2424cccfc2abSDetlev Zundel		kernel. Needed for UBI support.
2425cccfc2abSDetlev Zundel
24266a11cf48SDaniel Schwierzeck- SPL framework
24276a11cf48SDaniel Schwierzeck		CONFIG_SPL
24286a11cf48SDaniel Schwierzeck		Enable building of SPL globally.
24296a11cf48SDaniel Schwierzeck
24306a11cf48SDaniel Schwierzeck		CONFIG_SPL_TEXT_BASE
24316a11cf48SDaniel Schwierzeck		TEXT_BASE for linking the SPL binary.
24326a11cf48SDaniel Schwierzeck
24336a11cf48SDaniel Schwierzeck		CONFIG_SPL_LDSCRIPT
24346a11cf48SDaniel Schwierzeck		LDSCRIPT for linking the SPL binary.
24356a11cf48SDaniel Schwierzeck
24366a11cf48SDaniel Schwierzeck		CONFIG_SPL_LIBCOMMON_SUPPORT
24376a11cf48SDaniel Schwierzeck		Support for common/libcommon.o in SPL binary
24386a11cf48SDaniel Schwierzeck
24396a11cf48SDaniel Schwierzeck		CONFIG_SPL_LIBDISK_SUPPORT
24406a11cf48SDaniel Schwierzeck		Support for disk/libdisk.o in SPL binary
24416a11cf48SDaniel Schwierzeck
24426a11cf48SDaniel Schwierzeck		CONFIG_SPL_I2C_SUPPORT
24436a11cf48SDaniel Schwierzeck		Support for drivers/i2c/libi2c.o in SPL binary
24446a11cf48SDaniel Schwierzeck
24456a11cf48SDaniel Schwierzeck		CONFIG_SPL_GPIO_SUPPORT
24466a11cf48SDaniel Schwierzeck		Support for drivers/gpio/libgpio.o in SPL binary
24476a11cf48SDaniel Schwierzeck
24486a11cf48SDaniel Schwierzeck		CONFIG_SPL_MMC_SUPPORT
24496a11cf48SDaniel Schwierzeck		Support for drivers/mmc/libmmc.o in SPL binary
24506a11cf48SDaniel Schwierzeck
24516a11cf48SDaniel Schwierzeck		CONFIG_SPL_SERIAL_SUPPORT
24526a11cf48SDaniel Schwierzeck		Support for drivers/serial/libserial.o in SPL binary
24536a11cf48SDaniel Schwierzeck
24546a11cf48SDaniel Schwierzeck		CONFIG_SPL_SPI_FLASH_SUPPORT
24556a11cf48SDaniel Schwierzeck		Support for drivers/mtd/spi/libspi_flash.o in SPL binary
24566a11cf48SDaniel Schwierzeck
24576a11cf48SDaniel Schwierzeck		CONFIG_SPL_SPI_SUPPORT
24586a11cf48SDaniel Schwierzeck		Support for drivers/spi/libspi.o in SPL binary
24596a11cf48SDaniel Schwierzeck
24606a11cf48SDaniel Schwierzeck		CONFIG_SPL_FAT_SUPPORT
24616a11cf48SDaniel Schwierzeck		Support for fs/fat/libfat.o in SPL binary
24626a11cf48SDaniel Schwierzeck
24636a11cf48SDaniel Schwierzeck		CONFIG_SPL_LIBGENERIC_SUPPORT
24646a11cf48SDaniel Schwierzeck		Support for lib/libgeneric.o in SPL binary
24651372cce2SMarian Balakowicz
2466c609719bSwdenkModem Support:
2467c609719bSwdenk--------------
2468c609719bSwdenk
2469566e5cf4SWolfgang Denk[so far only for SMDK2400 boards]
2470c609719bSwdenk
247111ccc33fSMarcel Ziswiler- Modem support enable:
2472c609719bSwdenk		CONFIG_MODEM_SUPPORT
2473c609719bSwdenk
2474c609719bSwdenk- RTS/CTS Flow control enable:
2475c609719bSwdenk		CONFIG_HWFLOW
2476c609719bSwdenk
2477c609719bSwdenk- Modem debug support:
2478c609719bSwdenk		CONFIG_MODEM_SUPPORT_DEBUG
2479c609719bSwdenk
2480c609719bSwdenk		Enables debugging stuff (char screen[1024], dbg())
2481c609719bSwdenk		for modem support. Useful only with BDI2000.
2482c609719bSwdenk
2483a8c7c708Swdenk- Interrupt support (PPC):
2484a8c7c708Swdenk
2485a8c7c708Swdenk		There are common interrupt_init() and timer_interrupt()
2486a8c7c708Swdenk		for all PPC archs. interrupt_init() calls interrupt_init_cpu()
248711ccc33fSMarcel Ziswiler		for CPU specific initialization. interrupt_init_cpu()
2488a8c7c708Swdenk		should set decrementer_count to appropriate value. If
248911ccc33fSMarcel Ziswiler		CPU resets decrementer automatically after interrupt
2490a8c7c708Swdenk		(ppc4xx) it should set decrementer_count to zero.
249111ccc33fSMarcel Ziswiler		timer_interrupt() calls timer_interrupt_cpu() for CPU
2492a8c7c708Swdenk		specific handling. If board has watchdog / status_led
2493a8c7c708Swdenk		/ other_activity_monitor it works automatically from
2494a8c7c708Swdenk		general timer_interrupt().
2495a8c7c708Swdenk
2496c609719bSwdenk- General:
2497c609719bSwdenk
2498c609719bSwdenk		In the target system modem support is enabled when a
2499c609719bSwdenk		specific key (key combination) is pressed during
2500c609719bSwdenk		power-on. Otherwise U-Boot will boot normally
250111ccc33fSMarcel Ziswiler		(autoboot). The key_pressed() function is called from
2502c609719bSwdenk		board_init(). Currently key_pressed() is a dummy
2503c609719bSwdenk		function, returning 1 and thus enabling modem
2504c609719bSwdenk		initialization.
2505c609719bSwdenk
2506c609719bSwdenk		If there are no modem init strings in the
2507c609719bSwdenk		environment, U-Boot proceed to autoboot; the
2508c609719bSwdenk		previous output (banner, info printfs) will be
250911ccc33fSMarcel Ziswiler		suppressed, though.
2510c609719bSwdenk
2511c609719bSwdenk		See also: doc/README.Modem
2512c609719bSwdenk
25139660e442SHelmut RaigerBoard initialization settings:
25149660e442SHelmut Raiger------------------------------
25159660e442SHelmut Raiger
25169660e442SHelmut RaigerDuring Initialization u-boot calls a number of board specific functions
25179660e442SHelmut Raigerto allow the preparation of board specific prerequisites, e.g. pin setup
25189660e442SHelmut Raigerbefore drivers are initialized. To enable these callbacks the
25199660e442SHelmut Raigerfollowing configuration macros have to be defined. Currently this is
25209660e442SHelmut Raigerarchitecture specific, so please check arch/your_architecture/lib/board.c
25219660e442SHelmut Raigertypically in board_init_f() and board_init_r().
25229660e442SHelmut Raiger
25239660e442SHelmut Raiger- CONFIG_BOARD_EARLY_INIT_F: Call board_early_init_f()
25249660e442SHelmut Raiger- CONFIG_BOARD_EARLY_INIT_R: Call board_early_init_r()
25259660e442SHelmut Raiger- CONFIG_BOARD_LATE_INIT: Call board_late_init()
25269660e442SHelmut Raiger- CONFIG_BOARD_POSTCLK_INIT: Call board_postclk_init()
2527c609719bSwdenk
2528c609719bSwdenkConfiguration Settings:
2529c609719bSwdenk-----------------------
2530c609719bSwdenk
25316d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_LONGHELP: Defined when you want long help messages included;
2532c609719bSwdenk		undefine this when you're short of memory.
2533c609719bSwdenk
25342fb2604dSPeter Tyser- CONFIG_SYS_HELP_CMD_WIDTH: Defined when you want to override the default
25352fb2604dSPeter Tyser		width of the commands listed in the 'help' command output.
25362fb2604dSPeter Tyser
25376d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PROMPT:	This is what U-Boot prints on the console to
2538c609719bSwdenk		prompt for user input.
2539c609719bSwdenk
25406d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CBSIZE:	Buffer size for input from the Console
2541c609719bSwdenk
25426d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PBSIZE:	Buffer size for Console output
2543c609719bSwdenk
25446d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAXARGS:	max. Number of arguments accepted for monitor commands
2545c609719bSwdenk
25466d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BARGSIZE: Buffer size for Boot Arguments which are passed to
2547c609719bSwdenk		the application (usually a Linux kernel) when it is
2548c609719bSwdenk		booted
2549c609719bSwdenk
25506d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BAUDRATE_TABLE:
2551c609719bSwdenk		List of legal baudrate settings for this board.
2552c609719bSwdenk
25536d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_INFO_QUIET
2554c609719bSwdenk		Suppress display of console information at boot.
2555c609719bSwdenk
25566d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_IS_IN_ENV
2557c609719bSwdenk		If the board specific function
2558c609719bSwdenk			extern int overwrite_console (void);
2559c609719bSwdenk		returns 1, the stdin, stderr and stdout are switched to the
2560c609719bSwdenk		serial port, else the settings in the environment are used.
2561c609719bSwdenk
25626d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
2563c609719bSwdenk		Enable the call to overwrite_console().
2564c609719bSwdenk
25656d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_ENV_OVERWRITE
2566c609719bSwdenk		Enable overwrite of previous console environment settings.
2567c609719bSwdenk
25686d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEMTEST_START, CONFIG_SYS_MEMTEST_END:
2569c609719bSwdenk		Begin and End addresses of the area used by the
2570c609719bSwdenk		simple memory test.
2571c609719bSwdenk
25726d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_ALT_MEMTEST:
2573c609719bSwdenk		Enable an alternate, more extensive memory test.
2574c609719bSwdenk
25756d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEMTEST_SCRATCH:
25765f535fe1Swdenk		Scratch address used by the alternate memory test
25775f535fe1Swdenk		You only need to set this if address zero isn't writeable
25785f535fe1Swdenk
25796d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEM_TOP_HIDE (PPC only):
25806d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		If CONFIG_SYS_MEM_TOP_HIDE is defined in the board config header,
258114f73ca6SStefan Roese		this specified memory area will get subtracted from the top
258211ccc33fSMarcel Ziswiler		(end) of RAM and won't get "touched" at all by U-Boot. By
258314f73ca6SStefan Roese		fixing up gd->ram_size the Linux kernel should gets passed
258414f73ca6SStefan Roese		the now "corrected" memory size and won't touch it either.
258514f73ca6SStefan Roese		This should work for arch/ppc and arch/powerpc. Only Linux
25865e12e75dSStefan Roese		board ports in arch/powerpc with bootwrapper support that
258714f73ca6SStefan Roese		recalculate the memory size from the SDRAM controller setup
25885e12e75dSStefan Roese		will have to get fixed in Linux additionally.
258914f73ca6SStefan Roese
259014f73ca6SStefan Roese		This option can be used as a workaround for the 440EPx/GRx
259114f73ca6SStefan Roese		CHIP 11 errata where the last 256 bytes in SDRAM shouldn't
259214f73ca6SStefan Roese		be touched.
259314f73ca6SStefan Roese
259414f73ca6SStefan Roese		WARNING: Please make sure that this value is a multiple of
259514f73ca6SStefan Roese		the Linux page size (normally 4k). If this is not the case,
259614f73ca6SStefan Roese		then the end address of the Linux memory will be located at a
259714f73ca6SStefan Roese		non page size aligned address and this could cause major
259814f73ca6SStefan Roese		problems.
259914f73ca6SStefan Roese
26006d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_TFTP_LOADADDR:
2601c609719bSwdenk		Default load address for network file downloads
2602c609719bSwdenk
26036d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_LOADS_BAUD_CHANGE:
2604c609719bSwdenk		Enable temporary baudrate change while serial download
2605c609719bSwdenk
26066d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SDRAM_BASE:
2607c609719bSwdenk		Physical start address of SDRAM. _Must_ be 0 here.
2608c609719bSwdenk
26096d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MBIO_BASE:
2610c609719bSwdenk		Physical start address of Motherboard I/O (if using a
2611c609719bSwdenk		Cogent motherboard)
2612c609719bSwdenk
26136d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_BASE:
2614c609719bSwdenk		Physical start address of Flash memory.
2615c609719bSwdenk
26166d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MONITOR_BASE:
2617c609719bSwdenk		Physical start address of boot monitor code (set by
2618c609719bSwdenk		make config files to be same as the text base address
261914d0a02aSWolfgang Denk		(CONFIG_SYS_TEXT_BASE) used when linking) - same as
26206d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FLASH_BASE when booting from flash.
2621c609719bSwdenk
26226d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MONITOR_LEN:
26233b57fe0aSwdenk		Size of memory reserved for monitor code, used to
26243b57fe0aSwdenk		determine _at_compile_time_ (!) if the environment is
26253b57fe0aSwdenk		embedded within the U-Boot image, or in a separate
26263b57fe0aSwdenk		flash sector.
2627c609719bSwdenk
26286d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MALLOC_LEN:
2629c609719bSwdenk		Size of DRAM reserved for malloc() use.
2630c609719bSwdenk
26316d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BOOTM_LEN:
263215940c9aSStefan Roese		Normally compressed uImages are limited to an
263315940c9aSStefan Roese		uncompressed size of 8 MBytes. If this is not enough,
26346d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		you can define CONFIG_SYS_BOOTM_LEN in your board config file
263515940c9aSStefan Roese		to adjust this setting to your needs.
2636c609719bSwdenk
26376d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BOOTMAPSZ:
2638c609719bSwdenk		Maximum size of memory mapped by the startup code of
2639c609719bSwdenk		the Linux kernel; all data that must be processed by
26407d721e34SBartlomiej Sieka		the Linux kernel (bd_info, boot arguments, FDT blob if
26417d721e34SBartlomiej Sieka		used) must be put below this limit, unless "bootm_low"
26427d721e34SBartlomiej Sieka		enviroment variable is defined and non-zero. In such case
26437d721e34SBartlomiej Sieka		all data for the Linux kernel must be between "bootm_low"
2644c3624e6eSGrant Likely		and "bootm_low" + CONFIG_SYS_BOOTMAPSZ.	 The environment
2645c3624e6eSGrant Likely		variable "bootm_mapsize" will override the value of
2646c3624e6eSGrant Likely		CONFIG_SYS_BOOTMAPSZ.  If CONFIG_SYS_BOOTMAPSZ is undefined,
2647c3624e6eSGrant Likely		then the value in "bootm_size" will be used instead.
2648c609719bSwdenk
2649fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_RAMDISK_HIGH:
2650fca43cc8SJohn Rigby		Enable initrd_high functionality.  If defined then the
2651fca43cc8SJohn Rigby		initrd_high feature is enabled and the bootm ramdisk subcommand
2652fca43cc8SJohn Rigby		is enabled.
2653fca43cc8SJohn Rigby
2654fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_GET_CMDLINE:
2655fca43cc8SJohn Rigby		Enables allocating and saving kernel cmdline in space between
2656fca43cc8SJohn Rigby		"bootm_low" and "bootm_low" + BOOTMAPSZ.
2657fca43cc8SJohn Rigby
2658fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_GET_KBD:
2659fca43cc8SJohn Rigby		Enables allocating and saving a kernel copy of the bd_info in
2660fca43cc8SJohn Rigby		space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
2661fca43cc8SJohn Rigby
26626d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAX_FLASH_BANKS:
2663c609719bSwdenk		Max number of Flash memory banks
2664c609719bSwdenk
26656d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAX_FLASH_SECT:
2666c609719bSwdenk		Max number of sectors on a Flash chip
2667c609719bSwdenk
26686d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_ERASE_TOUT:
2669c609719bSwdenk		Timeout for Flash erase operations (in ms)
2670c609719bSwdenk
26716d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_WRITE_TOUT:
2672c609719bSwdenk		Timeout for Flash write operations (in ms)
2673c609719bSwdenk
26746d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_LOCK_TOUT
26758564acf9Swdenk		Timeout for Flash set sector lock bit operation (in ms)
26768564acf9Swdenk
26776d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_UNLOCK_TOUT
26788564acf9Swdenk		Timeout for Flash clear lock bits operation (in ms)
26798564acf9Swdenk
26806d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_PROTECTION
26818564acf9Swdenk		If defined, hardware flash sectors protection is used
26828564acf9Swdenk		instead of U-Boot software protection.
26838564acf9Swdenk
26846d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DIRECT_FLASH_TFTP:
2685c609719bSwdenk
2686c609719bSwdenk		Enable TFTP transfers directly to flash memory;
2687c609719bSwdenk		without this option such a download has to be
2688c609719bSwdenk		performed in two steps: (1) download to RAM, and (2)
2689c609719bSwdenk		copy from RAM to flash.
2690c609719bSwdenk
2691c609719bSwdenk		The two-step approach is usually more reliable, since
2692c609719bSwdenk		you can check if the download worked before you erase
269311ccc33fSMarcel Ziswiler		the flash, but in some situations (when system RAM is
269411ccc33fSMarcel Ziswiler		too limited to allow for a temporary copy of the
2695c609719bSwdenk		downloaded image) this option may be very useful.
2696c609719bSwdenk
26976d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_CFI:
2698c609719bSwdenk		Define if the flash driver uses extra elements in the
26995653fc33Swdenk		common flash structure for storing flash geometry.
27005653fc33Swdenk
270100b1883aSJean-Christophe PLAGNIOL-VILLARD- CONFIG_FLASH_CFI_DRIVER
27025653fc33Swdenk		This option also enables the building of the cfi_flash driver
27035653fc33Swdenk		in the drivers directory
270453cf9435Sstroese
270591809ed5SPiotr Ziecik- CONFIG_FLASH_CFI_MTD
270691809ed5SPiotr Ziecik		This option enables the building of the cfi_mtd driver
270791809ed5SPiotr Ziecik		in the drivers directory. The driver exports CFI flash
270891809ed5SPiotr Ziecik		to the MTD layer.
270991809ed5SPiotr Ziecik
27106d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_USE_BUFFER_WRITE
271196ef831fSGuennadi Liakhovetski		Use buffered writes to flash.
271296ef831fSGuennadi Liakhovetski
271396ef831fSGuennadi Liakhovetski- CONFIG_FLASH_SPANSION_S29WS_N
271496ef831fSGuennadi Liakhovetski		s29ws-n MirrorBit flash has non-standard addresses for buffered
271596ef831fSGuennadi Liakhovetski		write commands.
271696ef831fSGuennadi Liakhovetski
27176d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_QUIET_TEST
27185568e613SStefan Roese		If this option is defined, the common CFI flash doesn't
27195568e613SStefan Roese		print it's warning upon not recognized FLASH banks. This
27205568e613SStefan Roese		is useful, if some of the configured banks are only
27215568e613SStefan Roese		optionally available.
27225568e613SStefan Roese
27239a042e9cSJerry Van Baren- CONFIG_FLASH_SHOW_PROGRESS
27249a042e9cSJerry Van Baren		If defined (must be an integer), print out countdown
27259a042e9cSJerry Van Baren		digits and dots.  Recommended value: 45 (9..1) for 80
27269a042e9cSJerry Van Baren		column displays, 15 (3..1) for 40 column displays.
27279a042e9cSJerry Van Baren
27286d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_RX_ETH_BUFFER:
272911ccc33fSMarcel Ziswiler		Defines the number of Ethernet receive buffers. On some
273011ccc33fSMarcel Ziswiler		Ethernet controllers it is recommended to set this value
273153cf9435Sstroese		to 8 or even higher (EEPRO100 or 405 EMAC), since all
273253cf9435Sstroese		buffers can be full shortly after enabling the interface
273311ccc33fSMarcel Ziswiler		on high Ethernet traffic.
273453cf9435Sstroese		Defaults to 4 if not defined.
2735c609719bSwdenk
2736ea882bafSWolfgang Denk- CONFIG_ENV_MAX_ENTRIES
2737ea882bafSWolfgang Denk
2738ea882bafSWolfgang Denk	Maximum number of entries in the hash table that is used
2739ea882bafSWolfgang Denk	internally to store the environment settings. The default
2740ea882bafSWolfgang Denk	setting is supposed to be generous and should work in most
2741ea882bafSWolfgang Denk	cases. This setting can be used to tune behaviour; see
2742ea882bafSWolfgang Denk	lib/hashtable.c for details.
2743ea882bafSWolfgang Denk
2744c609719bSwdenkThe following definitions that deal with the placement and management
2745c609719bSwdenkof environment data (variable area); in general, we support the
2746c609719bSwdenkfollowing configurations:
2747c609719bSwdenk
2748c3eb3fe4SMike Frysinger- CONFIG_BUILD_ENVCRC:
2749c3eb3fe4SMike Frysinger
2750c3eb3fe4SMike Frysinger	Builds up envcrc with the target environment so that external utils
2751c3eb3fe4SMike Frysinger	may easily extract it and embed it in final U-Boot images.
2752c3eb3fe4SMike Frysinger
27535a1aceb0SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_FLASH:
2754c609719bSwdenk
2755c609719bSwdenk	Define this if the environment is in flash memory.
2756c609719bSwdenk
2757c609719bSwdenk	a) The environment occupies one whole flash sector, which is
2758c609719bSwdenk	   "embedded" in the text segment with the U-Boot code. This
2759c609719bSwdenk	   happens usually with "bottom boot sector" or "top boot
2760c609719bSwdenk	   sector" type flash chips, which have several smaller
2761c609719bSwdenk	   sectors at the start or the end. For instance, such a
2762c609719bSwdenk	   layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In
2763c609719bSwdenk	   such a case you would place the environment in one of the
2764c609719bSwdenk	   4 kB sectors - with U-Boot code before and after it. With
2765c609719bSwdenk	   "top boot sector" type flash chips, you would put the
2766c609719bSwdenk	   environment in one of the last sectors, leaving a gap
2767c609719bSwdenk	   between U-Boot and the environment.
2768c609719bSwdenk
27690e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
2770c609719bSwdenk
2771c609719bSwdenk	   Offset of environment data (variable area) to the
2772c609719bSwdenk	   beginning of flash memory; for instance, with bottom boot
2773c609719bSwdenk	   type flash chips the second sector can be used: the offset
2774c609719bSwdenk	   for this sector is given here.
2775c609719bSwdenk
27766d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	   CONFIG_ENV_OFFSET is used relative to CONFIG_SYS_FLASH_BASE.
2777c609719bSwdenk
27780e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
2779c609719bSwdenk
2780c609719bSwdenk	   This is just another way to specify the start address of
2781c609719bSwdenk	   the flash sector containing the environment (instead of
27820e8d1586SJean-Christophe PLAGNIOL-VILLARD	   CONFIG_ENV_OFFSET).
2783c609719bSwdenk
27840e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SECT_SIZE:
2785c609719bSwdenk
2786c609719bSwdenk	   Size of the sector containing the environment.
2787c609719bSwdenk
2788c609719bSwdenk
2789c609719bSwdenk	b) Sometimes flash chips have few, equal sized, BIG sectors.
2790c609719bSwdenk	   In such a case you don't want to spend a whole sector for
2791c609719bSwdenk	   the environment.
2792c609719bSwdenk
27930e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
2794c609719bSwdenk
27955a1aceb0SJean-Christophe PLAGNIOL-VILLARD	   If you use this in combination with CONFIG_ENV_IS_IN_FLASH
27960e8d1586SJean-Christophe PLAGNIOL-VILLARD	   and CONFIG_ENV_SECT_SIZE, you can specify to use only a part
2797c609719bSwdenk	   of this flash sector for the environment. This saves
2798c609719bSwdenk	   memory for the RAM copy of the environment.
2799c609719bSwdenk
2800c609719bSwdenk	   It may also save flash memory if you decide to use this
2801c609719bSwdenk	   when your environment is "embedded" within U-Boot code,
2802c609719bSwdenk	   since then the remainder of the flash sector could be used
2803c609719bSwdenk	   for U-Boot code. It should be pointed out that this is
2804c609719bSwdenk	   STRONGLY DISCOURAGED from a robustness point of view:
2805c609719bSwdenk	   updating the environment in flash makes it always
2806c609719bSwdenk	   necessary to erase the WHOLE sector. If something goes
2807c609719bSwdenk	   wrong before the contents has been restored from a copy in
2808c609719bSwdenk	   RAM, your target system will be dead.
2809c609719bSwdenk
28100e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR_REDUND
28110e8d1586SJean-Christophe PLAGNIOL-VILLARD	  CONFIG_ENV_SIZE_REDUND
2812c609719bSwdenk
2813c609719bSwdenk	   These settings describe a second storage area used to hold
281411ccc33fSMarcel Ziswiler	   a redundant copy of the environment data, so that there is
28153e38691eSwdenk	   a valid backup copy in case there is a power failure during
2816c609719bSwdenk	   a "saveenv" operation.
2817c609719bSwdenk
2818c609719bSwdenkBE CAREFUL! Any changes to the flash layout, and some changes to the
2819c609719bSwdenksource code will make it necessary to adapt <board>/u-boot.lds*
2820c609719bSwdenkaccordingly!
2821c609719bSwdenk
2822c609719bSwdenk
28239314cee6SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_NVRAM:
2824c609719bSwdenk
2825c609719bSwdenk	Define this if you have some non-volatile memory device
2826c609719bSwdenk	(NVRAM, battery buffered SRAM) which you want to use for the
2827c609719bSwdenk	environment.
2828c609719bSwdenk
28290e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
28300e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
2831c609719bSwdenk
283211ccc33fSMarcel Ziswiler	  These two #defines are used to determine the memory area you
2833c609719bSwdenk	  want to use for environment. It is assumed that this memory
2834c609719bSwdenk	  can just be read and written to, without any special
2835c609719bSwdenk	  provision.
2836c609719bSwdenk
2837c609719bSwdenkBE CAREFUL! The first access to the environment happens quite early
2838c609719bSwdenkin U-Boot initalization (when we try to get the setting of for the
283911ccc33fSMarcel Ziswilerconsole baudrate). You *MUST* have mapped your NVRAM area then, or
2840c609719bSwdenkU-Boot will hang.
2841c609719bSwdenk
2842c609719bSwdenkPlease note that even with NVRAM we still use a copy of the
2843c609719bSwdenkenvironment in RAM: we could work on NVRAM directly, but we want to
2844c609719bSwdenkkeep settings there always unmodified except somebody uses "saveenv"
2845c609719bSwdenkto save the current settings.
2846c609719bSwdenk
2847c609719bSwdenk
2848bb1f8b4fSJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_EEPROM:
2849c609719bSwdenk
2850c609719bSwdenk	Use this if you have an EEPROM or similar serial access
2851c609719bSwdenk	device and a driver for it.
2852c609719bSwdenk
28530e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
28540e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
2855c609719bSwdenk
2856c609719bSwdenk	  These two #defines specify the offset and size of the
2857c609719bSwdenk	  environment area within the total memory of your EEPROM.
2858c609719bSwdenk
28596d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR:
2860c609719bSwdenk	  If defined, specified the chip address of the EEPROM device.
2861c609719bSwdenk	  The default address is zero.
2862c609719bSwdenk
28636d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_PAGE_WRITE_BITS:
2864c609719bSwdenk	  If defined, the number of bits used to address bytes in a
2865c609719bSwdenk	  single page in the EEPROM device.  A 64 byte page, for example
2866c609719bSwdenk	  would require six bits.
2867c609719bSwdenk
28686d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS:
2869c609719bSwdenk	  If defined, the number of milliseconds to delay between
2870c609719bSwdenk	  page writes.	The default is zero milliseconds.
2871c609719bSwdenk
28726d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR_LEN:
2873c609719bSwdenk	  The length in bytes of the EEPROM memory array address.  Note
2874c609719bSwdenk	  that this is NOT the chip address length!
2875c609719bSwdenk
28766d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW:
28775cf91d6bSwdenk	  EEPROM chips that implement "address overflow" are ones
28785cf91d6bSwdenk	  like Catalyst 24WC04/08/16 which has 9/10/11 bits of
28795cf91d6bSwdenk	  address and the extra bits end up in the "chip address" bit
28805cf91d6bSwdenk	  slots. This makes a 24WC08 (1Kbyte) chip look like four 256
28815cf91d6bSwdenk	  byte chips.
28825cf91d6bSwdenk
28835cf91d6bSwdenk	  Note that we consider the length of the address field to
28845cf91d6bSwdenk	  still be one byte because the extra address bits are hidden
28855cf91d6bSwdenk	  in the chip address.
28865cf91d6bSwdenk
28876d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_SIZE:
2888c609719bSwdenk	  The size in bytes of the EEPROM device.
2889c609719bSwdenk
2890548738b4SHeiko Schocher	- CONFIG_ENV_EEPROM_IS_ON_I2C
2891548738b4SHeiko Schocher	  define this, if you have I2C and SPI activated, and your
2892548738b4SHeiko Schocher	  EEPROM, which holds the environment, is on the I2C bus.
2893548738b4SHeiko Schocher
2894548738b4SHeiko Schocher	- CONFIG_I2C_ENV_EEPROM_BUS
2895548738b4SHeiko Schocher	  if you have an Environment on an EEPROM reached over
2896548738b4SHeiko Schocher	  I2C muxes, you can define here, how to reach this
2897548738b4SHeiko Schocher	  EEPROM. For example:
2898548738b4SHeiko Schocher
2899548738b4SHeiko Schocher	  #define CONFIG_I2C_ENV_EEPROM_BUS	  "pca9547:70:d\0"
2900548738b4SHeiko Schocher
2901548738b4SHeiko Schocher	  EEPROM which holds the environment, is reached over
2902548738b4SHeiko Schocher	  a pca9547 i2c mux with address 0x70, channel 3.
2903c609719bSwdenk
2904057c849cSJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_DATAFLASH:
29055779d8d9Swdenk
29065779d8d9Swdenk	Define this if you have a DataFlash memory device which you
29075779d8d9Swdenk	want to use for the environment.
29085779d8d9Swdenk
29090e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
29100e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
29110e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
29125779d8d9Swdenk
29135779d8d9Swdenk	  These three #defines specify the offset and size of the
29145779d8d9Swdenk	  environment area within the total memory of your DataFlash placed
29155779d8d9Swdenk	  at the specified address.
29165779d8d9Swdenk
291751bfee19SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_NAND:
291813a5695bSwdenk
291913a5695bSwdenk	Define this if you have a NAND device which you want to use
292013a5695bSwdenk	for the environment.
292113a5695bSwdenk
29220e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
29230e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
292413a5695bSwdenk
292513a5695bSwdenk	  These two #defines specify the offset and size of the environment
2926fdd813deSScott Wood	  area within the first NAND device.  CONFIG_ENV_OFFSET must be
2927fdd813deSScott Wood	  aligned to an erase block boundary.
29285779d8d9Swdenk
2929fdd813deSScott Wood	- CONFIG_ENV_OFFSET_REDUND (optional):
2930e443c944SMarkus Klotzbuecher
29310e8d1586SJean-Christophe PLAGNIOL-VILLARD	  This setting describes a second storage area of CONFIG_ENV_SIZE
2932fdd813deSScott Wood	  size used to hold a redundant copy of the environment data, so
2933fdd813deSScott Wood	  that there is a valid backup copy in case there is a power failure
2934fdd813deSScott Wood	  during a "saveenv" operation.	 CONFIG_ENV_OFFSET_RENDUND must be
2935fdd813deSScott Wood	  aligned to an erase block boundary.
2936e443c944SMarkus Klotzbuecher
2937fdd813deSScott Wood	- CONFIG_ENV_RANGE (optional):
2938fdd813deSScott Wood
2939fdd813deSScott Wood	  Specifies the length of the region in which the environment
2940fdd813deSScott Wood	  can be written.  This should be a multiple of the NAND device's
2941fdd813deSScott Wood	  block size.  Specifying a range with more erase blocks than
2942fdd813deSScott Wood	  are needed to hold CONFIG_ENV_SIZE allows bad blocks within
2943fdd813deSScott Wood	  the range to be avoided.
2944fdd813deSScott Wood
2945fdd813deSScott Wood	- CONFIG_ENV_OFFSET_OOB (optional):
2946fdd813deSScott Wood
2947fdd813deSScott Wood	  Enables support for dynamically retrieving the offset of the
2948fdd813deSScott Wood	  environment from block zero's out-of-band data.  The
2949fdd813deSScott Wood	  "nand env.oob" command can be used to record this offset.
2950fdd813deSScott Wood	  Currently, CONFIG_ENV_OFFSET_REDUND is not supported when
2951fdd813deSScott Wood	  using CONFIG_ENV_OFFSET_OOB.
2952e443c944SMarkus Klotzbuecher
2953b74ab737SGuennadi Liakhovetski- CONFIG_NAND_ENV_DST
2954b74ab737SGuennadi Liakhovetski
2955b74ab737SGuennadi Liakhovetski	Defines address in RAM to which the nand_spl code should copy the
2956b74ab737SGuennadi Liakhovetski	environment. If redundant environment is used, it will be copied to
2957b74ab737SGuennadi Liakhovetski	CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE.
2958b74ab737SGuennadi Liakhovetski
29596d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPI_INIT_OFFSET
2960c609719bSwdenk
2961c609719bSwdenk	Defines offset to the initial SPI buffer area in DPRAM. The
2962c609719bSwdenk	area is used at an early stage (ROM part) if the environment
2963c609719bSwdenk	is configured to reside in the SPI EEPROM: We need a 520 byte
2964c609719bSwdenk	scratch DPRAM area. It is used between the two initialization
2965c609719bSwdenk	calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems
2966c609719bSwdenk	to be a good choice since it makes it far enough from the
2967c609719bSwdenk	start of the data area as well as from the stack pointer.
2968c609719bSwdenk
2969e881cb56SBruce AdlerPlease note that the environment is read-only until the monitor
2970c609719bSwdenkhas been relocated to RAM and a RAM copy of the environment has been
2971cdb74977SWolfgang Denkcreated; also, when using EEPROM you will have to use getenv_f()
2972c609719bSwdenkuntil then to read environment variables.
2973c609719bSwdenk
297485ec0bccSwdenkThe environment is protected by a CRC32 checksum. Before the monitor
297585ec0bccSwdenkis relocated into RAM, as a result of a bad CRC you will be working
297685ec0bccSwdenkwith the compiled-in default environment - *silently*!!! [This is
297785ec0bccSwdenknecessary, because the first environment variable we need is the
297885ec0bccSwdenk"baudrate" setting for the console - if we have a bad CRC, we don't
297985ec0bccSwdenkhave any device yet where we could complain.]
2980c609719bSwdenk
2981c609719bSwdenkNote: once the monitor has been relocated, then it will complain if
2982c609719bSwdenkthe default environment is used; a new CRC is computed as soon as you
298385ec0bccSwdenkuse the "saveenv" command to store a valid environment.
2984c609719bSwdenk
29856d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FAULT_ECHO_LINK_DOWN:
2986fc3e2165Swdenk		Echo the inverted Ethernet link state to the fault LED.
2987fc3e2165Swdenk
29886d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		Note: If this option is active, then CONFIG_SYS_FAULT_MII_ADDR
2989fc3e2165Swdenk		      also needs to be defined.
2990fc3e2165Swdenk
29916d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FAULT_MII_ADDR:
2992fc3e2165Swdenk		MII address of the PHY to check for the Ethernet link state.
2993c609719bSwdenk
2994f5675aa5SRon Madrid- CONFIG_NS16550_MIN_FUNCTIONS:
2995f5675aa5SRon Madrid		Define this if you desire to only have use of the NS16550_init
2996f5675aa5SRon Madrid		and NS16550_putc functions for the serial driver located at
2997f5675aa5SRon Madrid		drivers/serial/ns16550.c.  This option is useful for saving
2998f5675aa5SRon Madrid		space for already greatly restricted images, including but not
2999f5675aa5SRon Madrid		limited to NAND_SPL configurations.
3000f5675aa5SRon Madrid
3001c609719bSwdenkLow Level (hardware related) configuration options:
3002dc7c9a1aSwdenk---------------------------------------------------
3003c609719bSwdenk
30046d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CACHELINE_SIZE:
3005c609719bSwdenk		Cache Line Size of the CPU.
3006c609719bSwdenk
30076d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DEFAULT_IMMR:
3008c609719bSwdenk		Default address of the IMMR after system reset.
30092535d602Swdenk
30102535d602Swdenk		Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU,
30112535d602Swdenk		and RPXsuper) to be able to adjust the position of
30122535d602Swdenk		the IMMR register after a reset.
3013c609719bSwdenk
3014e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_DEFAULT:
3015e46fedfeSTimur Tabi		Default (power-on reset) physical address of CCSR on Freescale
3016e46fedfeSTimur Tabi		PowerPC SOCs.
3017e46fedfeSTimur Tabi
3018e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR:
3019e46fedfeSTimur Tabi		Virtual address of CCSR.  On a 32-bit build, this is typically
3020e46fedfeSTimur Tabi		the same value as CONFIG_SYS_CCSRBAR_DEFAULT.
3021e46fedfeSTimur Tabi
3022e46fedfeSTimur Tabi		CONFIG_SYS_DEFAULT_IMMR must also be set to this value,
3023e46fedfeSTimur Tabi		for cross-platform code that uses that macro instead.
3024e46fedfeSTimur Tabi
3025e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS:
3026e46fedfeSTimur Tabi		Physical address of CCSR.  CCSR can be relocated to a new
3027e46fedfeSTimur Tabi		physical address, if desired.  In this case, this macro should
3028e46fedfeSTimur Tabi		be set to that address.	 Otherwise, it should be set to the
3029e46fedfeSTimur Tabi		same value as CONFIG_SYS_CCSRBAR_DEFAULT.  For example, CCSR
3030e46fedfeSTimur Tabi		is typically relocated on 36-bit builds.  It is recommended
3031e46fedfeSTimur Tabi		that this macro be defined via the _HIGH and _LOW macros:
3032e46fedfeSTimur Tabi
3033e46fedfeSTimur Tabi		#define CONFIG_SYS_CCSRBAR_PHYS ((CONFIG_SYS_CCSRBAR_PHYS_HIGH
3034e46fedfeSTimur Tabi			* 1ull) << 32 | CONFIG_SYS_CCSRBAR_PHYS_LOW)
3035e46fedfeSTimur Tabi
3036e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS_HIGH:
3037e46fedfeSTimur Tabi		Bits 33-36 of CONFIG_SYS_CCSRBAR_PHYS.	This value is typically
3038e46fedfeSTimur Tabi		either 0 (32-bit build) or 0xF (36-bit build).	This macro is
3039e46fedfeSTimur Tabi		used in assembly code, so it must not contain typecasts or
3040e46fedfeSTimur Tabi		integer size suffixes (e.g. "ULL").
3041e46fedfeSTimur Tabi
3042e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS_LOW:
3043e46fedfeSTimur Tabi		Lower 32-bits of CONFIG_SYS_CCSRBAR_PHYS.  This macro is
3044e46fedfeSTimur Tabi		used in assembly code, so it must not contain typecasts or
3045e46fedfeSTimur Tabi		integer size suffixes (e.g. "ULL").
3046e46fedfeSTimur Tabi
3047e46fedfeSTimur Tabi- CONFIG_SYS_CCSR_DO_NOT_RELOCATE:
3048e46fedfeSTimur Tabi		If this macro is defined, then CONFIG_SYS_CCSRBAR_PHYS will be
3049e46fedfeSTimur Tabi		forced to a value that ensures that CCSR is not relocated.
3050e46fedfeSTimur Tabi
30517f6c2cbcSwdenk- Floppy Disk Support:
30526d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FDC_DRIVE_NUMBER
30537f6c2cbcSwdenk
30547f6c2cbcSwdenk		the default drive number (default value 0)
30557f6c2cbcSwdenk
30566d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_ISA_IO_STRIDE
30577f6c2cbcSwdenk
305811ccc33fSMarcel Ziswiler		defines the spacing between FDC chipset registers
30597f6c2cbcSwdenk		(default value 1)
30607f6c2cbcSwdenk
30616d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_ISA_IO_OFFSET
30627f6c2cbcSwdenk
30637f6c2cbcSwdenk		defines the offset of register from address. It
30647f6c2cbcSwdenk		depends on which part of the data bus is connected to
306511ccc33fSMarcel Ziswiler		the FDC chipset. (default value 0)
30667f6c2cbcSwdenk
30676d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		If CONFIG_SYS_ISA_IO_STRIDE CONFIG_SYS_ISA_IO_OFFSET and
30686d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FDC_DRIVE_NUMBER are undefined, they take their
30697f6c2cbcSwdenk		default value.
30707f6c2cbcSwdenk
30716d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		if CONFIG_SYS_FDC_HW_INIT is defined, then the function
30727f6c2cbcSwdenk		fdc_hw_init() is called at the beginning of the FDC
30737f6c2cbcSwdenk		setup. fdc_hw_init() must be provided by the board
30747f6c2cbcSwdenk		source code. It is used to make hardware dependant
30757f6c2cbcSwdenk		initializations.
30767f6c2cbcSwdenk
30770abddf82SMacpaul Lin- CONFIG_IDE_AHB:
30780abddf82SMacpaul Lin		Most IDE controllers were designed to be connected with PCI
30790abddf82SMacpaul Lin		interface. Only few of them were designed for AHB interface.
30800abddf82SMacpaul Lin		When software is doing ATA command and data transfer to
30810abddf82SMacpaul Lin		IDE devices through IDE-AHB controller, some additional
30820abddf82SMacpaul Lin		registers accessing to these kind of IDE-AHB controller
30830abddf82SMacpaul Lin		is requierd.
30840abddf82SMacpaul Lin
30856d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_IMMR:	Physical address of the Internal Memory.
308625d6712aSwdenk		DO NOT CHANGE unless you know exactly what you're
308725d6712aSwdenk		doing! (11-4) [MPC8xx/82xx systems only]
3088c609719bSwdenk
30896d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_INIT_RAM_ADDR:
3090c609719bSwdenk
30917152b1d0Swdenk		Start address of memory area that can be used for
3092c609719bSwdenk		initial data and stack; please note that this must be
3093c609719bSwdenk		writable memory that is working WITHOUT special
3094c609719bSwdenk		initialization, i. e. you CANNOT use normal RAM which
3095c609719bSwdenk		will become available only after programming the
3096c609719bSwdenk		memory controller and running certain initialization
3097c609719bSwdenk		sequences.
3098c609719bSwdenk
3099c609719bSwdenk		U-Boot uses the following memory types:
3100c609719bSwdenk		- MPC8xx and MPC8260: IMMR (internal memory of the CPU)
3101c609719bSwdenk		- MPC824X: data cache
3102c609719bSwdenk		- PPC4xx:  data cache
3103c609719bSwdenk
31046d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_GBL_DATA_OFFSET:
3105c609719bSwdenk
3106c609719bSwdenk		Offset of the initial data structure in the memory
31076d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		area defined by CONFIG_SYS_INIT_RAM_ADDR. Usually
31086d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_GBL_DATA_OFFSET is chosen such that the initial
3109c609719bSwdenk		data is located at the end of the available space
3110553f0982SWolfgang Denk		(sometimes written as (CONFIG_SYS_INIT_RAM_SIZE -
31116d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_INIT_DATA_SIZE), and the initial stack is just
31126d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		below that area (growing from (CONFIG_SYS_INIT_RAM_ADDR +
31136d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_GBL_DATA_OFFSET) downward.
3114c609719bSwdenk
3115c609719bSwdenk	Note:
3116c609719bSwdenk		On the MPC824X (or other systems that use the data
3117c609719bSwdenk		cache for initial memory) the address chosen for
31186d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_INIT_RAM_ADDR is basically arbitrary - it must
3119c609719bSwdenk		point to an otherwise UNUSED address space between
3120c609719bSwdenk		the top of RAM and the start of the PCI space.
3121c609719bSwdenk
31226d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SIUMCR:	SIU Module Configuration (11-6)
3123c609719bSwdenk
31246d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SYPCR:	System Protection Control (11-9)
3125c609719bSwdenk
31266d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_TBSCR:	Time Base Status and Control (11-26)
3127c609719bSwdenk
31286d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PISCR:	Periodic Interrupt Status and Control (11-31)
3129c609719bSwdenk
31306d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PLPRCR:	PLL, Low-Power, and Reset Control Register (15-30)
3131c609719bSwdenk
31326d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SCCR:	System Clock and reset Control Register (15-27)
3133c609719bSwdenk
31346d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_OR_TIMING_SDRAM:
3135c609719bSwdenk		SDRAM timing
3136c609719bSwdenk
31376d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAMR_PTA:
3138c609719bSwdenk		periodic timer for refresh
3139c609719bSwdenk
31406d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DER:	Debug Event Register (37-47)
3141c609719bSwdenk
31426d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CONFIG_SYS_REMAP_OR_AM,
31436d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PRELIM_OR_AM, CONFIG_SYS_OR_TIMING_FLASH, CONFIG_SYS_OR0_REMAP,
31446d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR0_PRELIM, CONFIG_SYS_BR0_PRELIM, CONFIG_SYS_OR1_REMAP, CONFIG_SYS_OR1_PRELIM,
31456d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_BR1_PRELIM:
3146c609719bSwdenk		Memory Controller Definitions: BR0/1 and OR0/1 (FLASH)
3147c609719bSwdenk
3148c609719bSwdenk- SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE,
31496d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR_TIMING_SDRAM, CONFIG_SYS_OR2_PRELIM, CONFIG_SYS_BR2_PRELIM,
31506d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR3_PRELIM, CONFIG_SYS_BR3_PRELIM:
3151c609719bSwdenk		Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM)
3152c609719bSwdenk
31536d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAMR_PTA, CONFIG_SYS_MPTPR_2BK_4K, CONFIG_SYS_MPTPR_1BK_4K, CONFIG_SYS_MPTPR_2BK_8K,
31546d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_MPTPR_1BK_8K, CONFIG_SYS_MAMR_8COL, CONFIG_SYS_MAMR_9COL:
3155c609719bSwdenk		Machine Mode Register and Memory Periodic Timer
3156c609719bSwdenk		Prescaler definitions (SDRAM timing)
3157c609719bSwdenk
31586d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_I2C_UCODE_PATCH, CONFIG_SYS_I2C_DPMEM_OFFSET [0x1FC0]:
3159c609719bSwdenk		enable I2C microcode relocation patch (MPC8xx);
3160c609719bSwdenk		define relocation offset in DPRAM [DSP2]
3161c609719bSwdenk
31626d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SMC_UCODE_PATCH, CONFIG_SYS_SMC_DPMEM_OFFSET [0x1FC0]:
3163b423d055SHeiko Schocher		enable SMC microcode relocation patch (MPC8xx);
3164b423d055SHeiko Schocher		define relocation offset in DPRAM [SMC1]
3165b423d055SHeiko Schocher
31666d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPI_UCODE_PATCH, CONFIG_SYS_SPI_DPMEM_OFFSET [0x1FC0]:
3167c609719bSwdenk		enable SPI microcode relocation patch (MPC8xx);
3168c609719bSwdenk		define relocation offset in DPRAM [SCC4]
3169c609719bSwdenk
31706d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_USE_OSCCLK:
3171c609719bSwdenk		Use OSCM clock mode on MBX8xx board. Be careful,
3172c609719bSwdenk		wrong setting might damage your board. Read
3173c609719bSwdenk		doc/README.MBX before setting this variable!
3174c609719bSwdenk
31756d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only)
3176ea909b76Swdenk		Offset of the bootmode word in DPRAM used by post
3177ea909b76Swdenk		(Power On Self Tests). This definition overrides
3178ea909b76Swdenk		#define'd default value in commproc.h resp.
3179ea909b76Swdenk		cpm_8260.h.
3180ea909b76Swdenk
31816d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PCI_SLV_MEM_LOCAL, CONFIG_SYS_PCI_SLV_MEM_BUS, CONFIG_SYS_PICMR0_MASK_ATTRIB,
31826d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR0_LOCAL, CONFIG_SYS_PCIMSK0_MASK, CONFIG_SYS_PCI_MSTR1_LOCAL,
31836d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCIMSK1_MASK, CONFIG_SYS_PCI_MSTR_MEM_LOCAL, CONFIG_SYS_PCI_MSTR_MEM_BUS,
31846d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_CPU_PCI_MEM_START, CONFIG_SYS_PCI_MSTR_MEM_SIZE, CONFIG_SYS_POCMR0_MASK_ATTRIB,
31856d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_MEMIO_LOCAL, CONFIG_SYS_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START,
31866d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_MEMIO_SIZE, CONFIG_SYS_POCMR1_MASK_ATTRIB, CONFIG_SYS_PCI_MSTR_IO_LOCAL,
31876d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_IO_BUS, CONFIG_SYS_CPU_PCI_IO_START, CONFIG_SYS_PCI_MSTR_IO_SIZE,
31886d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_POCMR2_MASK_ATTRIB: (MPC826x only)
3189a47a12beSStefan Roese		Overrides the default PCI memory map in arch/powerpc/cpu/mpc8260/pci.c if set.
31905d232d0eSwdenk
31919cacf4fcSDirk Eibach- CONFIG_PCI_DISABLE_PCIE:
31929cacf4fcSDirk Eibach		Disable PCI-Express on systems where it is supported but not
31939cacf4fcSDirk Eibach		required.
31949cacf4fcSDirk Eibach
3195a09b9b68SKumar Gala- CONFIG_SYS_SRIO:
3196a09b9b68SKumar Gala		Chip has SRIO or not
3197a09b9b68SKumar Gala
3198a09b9b68SKumar Gala- CONFIG_SRIO1:
3199a09b9b68SKumar Gala		Board has SRIO 1 port available
3200a09b9b68SKumar Gala
3201a09b9b68SKumar Gala- CONFIG_SRIO2:
3202a09b9b68SKumar Gala		Board has SRIO 2 port available
3203a09b9b68SKumar Gala
3204a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_VIRT:
3205a09b9b68SKumar Gala		Virtual Address of SRIO port 'n' memory region
3206a09b9b68SKumar Gala
3207a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_PHYS:
3208a09b9b68SKumar Gala		Physical Address of SRIO port 'n' memory region
3209a09b9b68SKumar Gala
3210a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_SIZE:
3211a09b9b68SKumar Gala		Size of SRIO port 'n' memory region
3212a09b9b68SKumar Gala
3213eced4626SAlex Waterman- CONFIG_SYS_NDFC_16
3214eced4626SAlex Waterman		Defined to tell the NDFC that the NAND chip is using a
3215eced4626SAlex Waterman		16 bit bus.
3216eced4626SAlex Waterman
3217eced4626SAlex Waterman- CONFIG_SYS_NDFC_EBC0_CFG
3218eced4626SAlex Waterman		Sets the EBC0_CFG register for the NDFC. If not defined
3219eced4626SAlex Waterman		a default value will be used.
3220eced4626SAlex Waterman
3221bb99ad6dSBen Warren- CONFIG_SPD_EEPROM
3222218ca724SWolfgang Denk		Get DDR timing information from an I2C EEPROM. Common
3223218ca724SWolfgang Denk		with pluggable memory modules such as SODIMMs
3224218ca724SWolfgang Denk
3225bb99ad6dSBen Warren  SPD_EEPROM_ADDRESS
3226bb99ad6dSBen Warren		I2C address of the SPD EEPROM
3227bb99ad6dSBen Warren
32286d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPD_BUS_NUM
3229218ca724SWolfgang Denk		If SPD EEPROM is on an I2C bus other than the first
3230218ca724SWolfgang Denk		one, specify here. Note that the value must resolve
3231218ca724SWolfgang Denk		to something your driver can deal with.
3232bb99ad6dSBen Warren
32331b3e3c4fSYork Sun- CONFIG_SYS_DDR_RAW_TIMING
32341b3e3c4fSYork Sun		Get DDR timing information from other than SPD. Common with
32351b3e3c4fSYork Sun		soldered DDR chips onboard without SPD. DDR raw timing
32361b3e3c4fSYork Sun		parameters are extracted from datasheet and hard-coded into
32371b3e3c4fSYork Sun		header files or board specific files.
32381b3e3c4fSYork Sun
32396f5e1dc5SYork Sun- CONFIG_FSL_DDR_INTERACTIVE
32406f5e1dc5SYork Sun		Enable interactive DDR debugging. See doc/README.fsl-ddr.
32416f5e1dc5SYork Sun
32426d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_83XX_DDR_USES_CS0
3243218ca724SWolfgang Denk		Only for 83xx systems. If specified, then DDR should
3244218ca724SWolfgang Denk		be configured using CS0 and CS1 instead of CS2 and CS3.
32452ad6b513STimur Tabi
3246c26e454dSwdenk- CONFIG_ETHER_ON_FEC[12]
3247c26e454dSwdenk		Define to enable FEC[12] on a 8xx series processor.
3248c26e454dSwdenk
3249c26e454dSwdenk- CONFIG_FEC[12]_PHY
3250c26e454dSwdenk		Define to the hardcoded PHY address which corresponds
32516e592385Swdenk		to the given FEC; i. e.
3252c26e454dSwdenk			#define CONFIG_FEC1_PHY 4
3253c26e454dSwdenk		means that the PHY with address 4 is connected to FEC1
3254c26e454dSwdenk
3255c26e454dSwdenk		When set to -1, means to probe for first available.
3256c26e454dSwdenk
3257c26e454dSwdenk- CONFIG_FEC[12]_PHY_NORXERR
3258c26e454dSwdenk		The PHY does not have a RXERR line (RMII only).
3259c26e454dSwdenk		(so program the FEC to ignore it).
3260c26e454dSwdenk
3261c26e454dSwdenk- CONFIG_RMII
3262c26e454dSwdenk		Enable RMII mode for all FECs.
3263c26e454dSwdenk		Note that this is a global option, we can't
3264c26e454dSwdenk		have one FEC in standard MII mode and another in RMII mode.
3265c26e454dSwdenk
32665cf91d6bSwdenk- CONFIG_CRC32_VERIFY
32675cf91d6bSwdenk		Add a verify option to the crc32 command.
32685cf91d6bSwdenk		The syntax is:
32695cf91d6bSwdenk
32705cf91d6bSwdenk		=> crc32 -v <address> <count> <crc32>
32715cf91d6bSwdenk
32725cf91d6bSwdenk		Where address/count indicate a memory area
32735cf91d6bSwdenk		and crc32 is the correct crc32 which the
32745cf91d6bSwdenk		area should have.
32755cf91d6bSwdenk
327656523f12Swdenk- CONFIG_LOOPW
327756523f12Swdenk		Add the "loopw" memory command. This only takes effect if
3278602ad3b3SJon Loeliger		the memory commands are activated globally (CONFIG_CMD_MEM).
327956523f12Swdenk
32807b466641Sstroese- CONFIG_MX_CYCLIC
32817b466641Sstroese		Add the "mdc" and "mwc" memory commands. These are cyclic
32827b466641Sstroese		"md/mw" commands.
32837b466641Sstroese		Examples:
32847b466641Sstroese
32857b466641Sstroese		=> mdc.b 10 4 500
32867b466641Sstroese		This command will print 4 bytes (10,11,12,13) each 500 ms.
32877b466641Sstroese
32887b466641Sstroese		=> mwc.l 100 12345678 10
32897b466641Sstroese		This command will write 12345678 to address 100 all 10 ms.
32907b466641Sstroese
32917b466641Sstroese		This only takes effect if the memory commands are activated
3292602ad3b3SJon Loeliger		globally (CONFIG_CMD_MEM).
32937b466641Sstroese
32948aa1a2d1Swdenk- CONFIG_SKIP_LOWLEVEL_INIT
3295afc1ce82SMacpaul Lin		[ARM, NDS32, MIPS only] If this variable is defined, then certain
3296e03f3169SWolfgang Denk		low level initializations (like setting up the memory
3297e03f3169SWolfgang Denk		controller) are omitted and/or U-Boot does not
3298e03f3169SWolfgang Denk		relocate itself into RAM.
32998aa1a2d1Swdenk
3300e03f3169SWolfgang Denk		Normally this variable MUST NOT be defined. The only
3301e03f3169SWolfgang Denk		exception is when U-Boot is loaded (to RAM) by some
3302e03f3169SWolfgang Denk		other boot loader or by a debugger which performs
3303e03f3169SWolfgang Denk		these initializations itself.
33048aa1a2d1Swdenk
3305401bb30bSAneesh V- CONFIG_SPL_BUILD
3306df81238bSMagnus Lilja		Modifies the behaviour of start.S when compiling a loader
3307df81238bSMagnus Lilja		that is executed before the actual U-Boot. E.g. when
3308df81238bSMagnus Lilja		compiling a NAND SPL.
3309400558b5Swdenk
331068bb8295SHeiko Schocher- CONFIG_SYS_NAND_HW_ECC_OOBFIRST
331168bb8295SHeiko Schocher		define this, if you want to read first the oob data
331268bb8295SHeiko Schocher		and then the data. This is used for example on
331368bb8295SHeiko Schocher		davinci plattforms.
331468bb8295SHeiko Schocher
3315d8834a13SMatthias Weisser- CONFIG_USE_ARCH_MEMCPY
3316d8834a13SMatthias Weisser  CONFIG_USE_ARCH_MEMSET
3317d8834a13SMatthias Weisser		If these options are used a optimized version of memcpy/memset will
3318d8834a13SMatthias Weisser		be used if available. These functions may be faster under some
3319d8834a13SMatthias Weisser		conditions but may increase the binary size.
3320d8834a13SMatthias Weisser
3321f2717b47STimur TabiFreescale QE/FMAN Firmware Support:
3322f2717b47STimur Tabi-----------------------------------
3323f2717b47STimur Tabi
3324f2717b47STimur TabiThe Freescale QUICCEngine (QE) and Frame Manager (FMAN) both support the
3325f2717b47STimur Tabiloading of "firmware", which is encoded in the QE firmware binary format.
3326f2717b47STimur TabiThis firmware often needs to be loaded during U-Boot booting, so macros
3327f2717b47STimur Tabiare used to identify the storage device (NOR flash, SPI, etc) and the address
3328f2717b47STimur Tabiwithin that device.
3329f2717b47STimur Tabi
3330f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_ADDR
3331f2717b47STimur Tabi	The address in the storage device where the firmware is located.  The
3332f2717b47STimur Tabi	meaning of this address depends on which CONFIG_SYS_QE_FW_IN_xxx macro
3333f2717b47STimur Tabi	is also specified.
3334f2717b47STimur Tabi
3335f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_LENGTH
3336f2717b47STimur Tabi	The maximum possible size of the firmware.  The firmware binary format
3337f2717b47STimur Tabi	has a field that specifies the actual size of the firmware, but it
3338f2717b47STimur Tabi	might not be possible to read any part of the firmware unless some
3339f2717b47STimur Tabi	local storage is allocated to hold the entire firmware first.
3340f2717b47STimur Tabi
3341f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_NOR
3342f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located in NOR flash, mapped as
3343f2717b47STimur Tabi	normal addressable memory via the LBC.  CONFIG_SYS_FMAN_FW_ADDR is the
3344f2717b47STimur Tabi	virtual address in NOR flash.
3345f2717b47STimur Tabi
3346f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_NAND
3347f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located in NAND flash.
3348f2717b47STimur Tabi	CONFIG_SYS_FMAN_FW_ADDR is the offset within NAND flash.
3349f2717b47STimur Tabi
3350f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_MMC
3351f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located on the primary SD/MMC
3352f2717b47STimur Tabi	device.  CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device.
3353f2717b47STimur Tabi
3354f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_SPIFLASH
3355f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located on the primary SPI
3356f2717b47STimur Tabi	device.  CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device.
3357f2717b47STimur Tabi
3358f2717b47STimur Tabi
3359c609719bSwdenkBuilding the Software:
3360c609719bSwdenk======================
3361c609719bSwdenk
3362218ca724SWolfgang DenkBuilding U-Boot has been tested in several native build environments
3363218ca724SWolfgang Denkand in many different cross environments. Of course we cannot support
3364218ca724SWolfgang Denkall possibly existing versions of cross development tools in all
3365218ca724SWolfgang Denk(potentially obsolete) versions. In case of tool chain problems we
3366218ca724SWolfgang Denkrecommend to use the ELDK (see http://www.denx.de/wiki/DULG/ELDK)
3367218ca724SWolfgang Denkwhich is extensively used to build and test U-Boot.
3368c609719bSwdenk
3369218ca724SWolfgang DenkIf you are not using a native environment, it is assumed that you
3370218ca724SWolfgang Denkhave GNU cross compiling tools available in your path. In this case,
3371218ca724SWolfgang Denkyou must set the environment variable CROSS_COMPILE in your shell.
3372218ca724SWolfgang DenkNote that no changes to the Makefile or any other source files are
3373218ca724SWolfgang Denknecessary. For example using the ELDK on a 4xx CPU, please enter:
3374c609719bSwdenk
3375218ca724SWolfgang Denk	$ CROSS_COMPILE=ppc_4xx-
3376218ca724SWolfgang Denk	$ export CROSS_COMPILE
3377c609719bSwdenk
33782f8d396bSPeter TyserNote: If you wish to generate Windows versions of the utilities in
33792f8d396bSPeter Tyser      the tools directory you can use the MinGW toolchain
33802f8d396bSPeter Tyser      (http://www.mingw.org).  Set your HOST tools to the MinGW
33812f8d396bSPeter Tyser      toolchain and execute 'make tools'.  For example:
33822f8d396bSPeter Tyser
33832f8d396bSPeter Tyser       $ make HOSTCC=i586-mingw32msvc-gcc HOSTSTRIP=i586-mingw32msvc-strip tools
33842f8d396bSPeter Tyser
33852f8d396bSPeter Tyser      Binaries such as tools/mkimage.exe will be created which can
33862f8d396bSPeter Tyser      be executed on computers running Windows.
33872f8d396bSPeter Tyser
3388c609719bSwdenkU-Boot is intended to be simple to build. After installing the
3389c609719bSwdenksources you must configure U-Boot for one specific board type. This
3390c609719bSwdenkis done by typing:
3391c609719bSwdenk
3392c609719bSwdenk	make NAME_config
3393c609719bSwdenk
3394218ca724SWolfgang Denkwhere "NAME_config" is the name of one of the existing configu-
3395218ca724SWolfgang Denkrations; see the main Makefile for supported names.
339654387ac9Swdenk
3397c609719bSwdenkNote: for some board special configuration names may exist; check if
3398c609719bSwdenk      additional information is available from the board vendor; for
33992729af9dSwdenk      instance, the TQM823L systems are available without (standard)
34002729af9dSwdenk      or with LCD support. You can select such additional "features"
340111ccc33fSMarcel Ziswiler      when choosing the configuration, i. e.
3402c609719bSwdenk
34032729af9dSwdenk      make TQM823L_config
34042729af9dSwdenk	- will configure for a plain TQM823L, i. e. no LCD support
3405c609719bSwdenk
3406c609719bSwdenk      make TQM823L_LCD_config
3407c609719bSwdenk	- will configure for a TQM823L with U-Boot console on LCD
3408c609719bSwdenk
3409c609719bSwdenk      etc.
3410c609719bSwdenk
3411c609719bSwdenk
3412c609719bSwdenkFinally, type "make all", and you should get some working U-Boot
34137152b1d0Swdenkimages ready for download to / installation on your system:
3414c609719bSwdenk
3415c609719bSwdenk- "u-boot.bin" is a raw binary image
3416c609719bSwdenk- "u-boot" is an image in ELF binary format
3417c609719bSwdenk- "u-boot.srec" is in Motorola S-Record format
3418c609719bSwdenk
3419baf31249SMarian BalakowiczBy default the build is performed locally and the objects are saved
3420baf31249SMarian Balakowiczin the source directory. One of the two methods can be used to change
3421baf31249SMarian Balakowiczthis behavior and build U-Boot to some external directory:
3422baf31249SMarian Balakowicz
3423baf31249SMarian Balakowicz1. Add O= to the make command line invocations:
3424baf31249SMarian Balakowicz
3425baf31249SMarian Balakowicz	make O=/tmp/build distclean
3426baf31249SMarian Balakowicz	make O=/tmp/build NAME_config
3427baf31249SMarian Balakowicz	make O=/tmp/build all
3428baf31249SMarian Balakowicz
3429baf31249SMarian Balakowicz2. Set environment variable BUILD_DIR to point to the desired location:
3430baf31249SMarian Balakowicz
3431baf31249SMarian Balakowicz	export BUILD_DIR=/tmp/build
3432baf31249SMarian Balakowicz	make distclean
3433baf31249SMarian Balakowicz	make NAME_config
3434baf31249SMarian Balakowicz	make all
3435baf31249SMarian Balakowicz
3436baf31249SMarian BalakowiczNote that the command line "O=" setting overrides the BUILD_DIR environment
3437baf31249SMarian Balakowiczvariable.
3438baf31249SMarian Balakowicz
3439c609719bSwdenk
3440c609719bSwdenkPlease be aware that the Makefiles assume you are using GNU make, so
3441c609719bSwdenkfor instance on NetBSD you might need to use "gmake" instead of
3442c609719bSwdenknative "make".
3443c609719bSwdenk
3444c609719bSwdenk
3445c609719bSwdenkIf the system board that you have is not listed, then you will need
3446c609719bSwdenkto port U-Boot to your hardware platform. To do this, follow these
3447c609719bSwdenksteps:
3448c609719bSwdenk
3449c609719bSwdenk1.  Add a new configuration option for your board to the toplevel
345085ec0bccSwdenk    "Makefile" and to the "MAKEALL" script, using the existing
345185ec0bccSwdenk    entries as examples. Note that here and at many other places
34527152b1d0Swdenk    boards and other names are listed in alphabetical sort order. Please
345385ec0bccSwdenk    keep this order.
3454c609719bSwdenk2.  Create a new directory to hold your board specific code. Add any
345585ec0bccSwdenk    files you need. In your board directory, you will need at least
345685ec0bccSwdenk    the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds".
345785ec0bccSwdenk3.  Create a new configuration file "include/configs/<board>.h" for
345885ec0bccSwdenk    your board
3459c609719bSwdenk3.  If you're porting U-Boot to a new CPU, then also create a new
3460c609719bSwdenk    directory to hold your CPU specific code. Add any files you need.
346185ec0bccSwdenk4.  Run "make <board>_config" with your new name.
3462c609719bSwdenk5.  Type "make", and you should get a working "u-boot.srec" file
3463c609719bSwdenk    to be installed on your target system.
346485ec0bccSwdenk6.  Debug and solve any problems that might arise.
3465c609719bSwdenk    [Of course, this last step is much harder than it sounds.]
3466c609719bSwdenk
3467c609719bSwdenk
3468c609719bSwdenkTesting of U-Boot Modifications, Ports to New Hardware, etc.:
3469c609719bSwdenk==============================================================
3470c609719bSwdenk
3471c609719bSwdenkIf you have modified U-Boot sources (for instance added a new board
3472c609719bSwdenkor support for new devices, a new CPU, etc.) you are expected to
3473c609719bSwdenkprovide feedback to the other developers. The feedback normally takes
3474c609719bSwdenkthe form of a "patch", i. e. a context diff against a certain (latest
3475218ca724SWolfgang Denkofficial or latest in the git repository) version of U-Boot sources.
3476c609719bSwdenk
3477c609719bSwdenkBut before you submit such a patch, please verify that your modifi-
3478c609719bSwdenkcation did not break existing code. At least make sure that *ALL* of
3479c609719bSwdenkthe supported boards compile WITHOUT ANY compiler warnings. To do so,
3480c609719bSwdenkjust run the "MAKEALL" script, which will configure and build U-Boot
3481c609719bSwdenkfor ALL supported system. Be warned, this will take a while. You can
34827152b1d0Swdenkselect which (cross) compiler to use by passing a `CROSS_COMPILE'
3483218ca724SWolfgang Denkenvironment variable to the script, i. e. to use the ELDK cross tools
3484218ca724SWolfgang Denkyou can type
3485c609719bSwdenk
3486c609719bSwdenk	CROSS_COMPILE=ppc_8xx- MAKEALL
3487c609719bSwdenk
3488c609719bSwdenkor to build on a native PowerPC system you can type
3489c609719bSwdenk
3490c609719bSwdenk	CROSS_COMPILE=' ' MAKEALL
3491c609719bSwdenk
3492218ca724SWolfgang DenkWhen using the MAKEALL script, the default behaviour is to build
3493218ca724SWolfgang DenkU-Boot in the source directory. This location can be changed by
3494218ca724SWolfgang Denksetting the BUILD_DIR environment variable. Also, for each target
3495218ca724SWolfgang Denkbuilt, the MAKEALL script saves two log files (<target>.ERR and
3496218ca724SWolfgang Denk<target>.MAKEALL) in the <source dir>/LOG directory. This default
3497218ca724SWolfgang Denklocation can be changed by setting the MAKEALL_LOGDIR environment
3498218ca724SWolfgang Denkvariable. For example:
3499baf31249SMarian Balakowicz
3500baf31249SMarian Balakowicz	export BUILD_DIR=/tmp/build
3501baf31249SMarian Balakowicz	export MAKEALL_LOGDIR=/tmp/log
3502baf31249SMarian Balakowicz	CROSS_COMPILE=ppc_8xx- MAKEALL
3503baf31249SMarian Balakowicz
3504218ca724SWolfgang DenkWith the above settings build objects are saved in the /tmp/build,
3505218ca724SWolfgang Denklog files are saved in the /tmp/log and the source tree remains clean
3506218ca724SWolfgang Denkduring the whole build process.
3507baf31249SMarian Balakowicz
3508baf31249SMarian Balakowicz
3509c609719bSwdenkSee also "U-Boot Porting Guide" below.
3510c609719bSwdenk
3511c609719bSwdenk
3512c609719bSwdenkMonitor Commands - Overview:
3513c609719bSwdenk============================
3514c609719bSwdenk
3515c609719bSwdenkgo	- start application at address 'addr'
3516c609719bSwdenkrun	- run commands in an environment variable
3517c609719bSwdenkbootm	- boot application image from memory
3518c609719bSwdenkbootp	- boot image via network using BootP/TFTP protocol
3519c609719bSwdenktftpboot- boot image via network using TFTP protocol
3520c609719bSwdenk	       and env variables "ipaddr" and "serverip"
3521c609719bSwdenk	       (and eventually "gatewayip")
35221fb7cd49SSimon Glasstftpput - upload a file via network using TFTP protocol
3523c609719bSwdenkrarpboot- boot image via network using RARP/TFTP protocol
3524c609719bSwdenkdiskboot- boot from IDE devicebootd   - boot default, i.e., run 'bootcmd'
3525c609719bSwdenkloads	- load S-Record file over serial line
3526c609719bSwdenkloadb	- load binary file over serial line (kermit mode)
3527c609719bSwdenkmd	- memory display
3528c609719bSwdenkmm	- memory modify (auto-incrementing)
3529c609719bSwdenknm	- memory modify (constant address)
3530c609719bSwdenkmw	- memory write (fill)
3531c609719bSwdenkcp	- memory copy
3532c609719bSwdenkcmp	- memory compare
3533c609719bSwdenkcrc32	- checksum calculation
35340f89c54bSPeter Tyseri2c	- I2C sub-system
3535c609719bSwdenksspi	- SPI utility commands
3536c609719bSwdenkbase	- print or set address offset
3537c609719bSwdenkprintenv- print environment variables
3538c609719bSwdenksetenv	- set environment variables
3539c609719bSwdenksaveenv - save environment variables to persistent storage
3540c609719bSwdenkprotect - enable or disable FLASH write protection
3541c609719bSwdenkerase	- erase FLASH memory
3542c609719bSwdenkflinfo	- print FLASH memory information
3543c609719bSwdenkbdinfo	- print Board Info structure
3544c609719bSwdenkiminfo	- print header information for application image
3545c609719bSwdenkconinfo - print console devices and informations
3546c609719bSwdenkide	- IDE sub-system
3547c609719bSwdenkloop	- infinite loop on address range
354856523f12Swdenkloopw	- infinite write loop on address range
3549c609719bSwdenkmtest	- simple RAM test
3550c609719bSwdenkicache	- enable or disable instruction cache
3551c609719bSwdenkdcache	- enable or disable data cache
3552c609719bSwdenkreset	- Perform RESET of the CPU
3553c609719bSwdenkecho	- echo args to console
3554c609719bSwdenkversion - print monitor version
3555c609719bSwdenkhelp	- print online help
3556c609719bSwdenk?	- alias for 'help'
3557c609719bSwdenk
3558c609719bSwdenk
3559c609719bSwdenkMonitor Commands - Detailed Description:
3560c609719bSwdenk========================================
3561c609719bSwdenk
3562c609719bSwdenkTODO.
3563c609719bSwdenk
3564c609719bSwdenkFor now: just type "help <command>".
3565c609719bSwdenk
3566c609719bSwdenk
3567c609719bSwdenkEnvironment Variables:
3568c609719bSwdenk======================
3569c609719bSwdenk
3570c609719bSwdenkU-Boot supports user configuration using Environment Variables which
3571c609719bSwdenkcan be made persistent by saving to Flash memory.
3572c609719bSwdenk
3573c609719bSwdenkEnvironment Variables are set using "setenv", printed using
3574c609719bSwdenk"printenv", and saved to Flash using "saveenv". Using "setenv"
3575c609719bSwdenkwithout a value can be used to delete a variable from the
3576c609719bSwdenkenvironment. As long as you don't save the environment you are
3577c609719bSwdenkworking with an in-memory copy. In case the Flash area containing the
3578c609719bSwdenkenvironment is erased by accident, a default environment is provided.
3579c609719bSwdenk
3580c96f86eeSWolfgang DenkSome configuration options can be set using Environment Variables.
3581c96f86eeSWolfgang Denk
3582c96f86eeSWolfgang DenkList of environment variables (most likely not complete):
3583c609719bSwdenk
3584c609719bSwdenk  baudrate	- see CONFIG_BAUDRATE
3585c609719bSwdenk
3586c609719bSwdenk  bootdelay	- see CONFIG_BOOTDELAY
3587c609719bSwdenk
3588c609719bSwdenk  bootcmd	- see CONFIG_BOOTCOMMAND
3589c609719bSwdenk
3590c609719bSwdenk  bootargs	- Boot arguments when booting an RTOS image
3591c609719bSwdenk
3592c609719bSwdenk  bootfile	- Name of the image to load with TFTP
3593c609719bSwdenk
35947d721e34SBartlomiej Sieka  bootm_low	- Memory range available for image processing in the bootm
35957d721e34SBartlomiej Sieka		  command can be restricted. This variable is given as
35967d721e34SBartlomiej Sieka		  a hexadecimal number and defines lowest address allowed
35977d721e34SBartlomiej Sieka		  for use by the bootm command. See also "bootm_size"
35987d721e34SBartlomiej Sieka		  environment variable. Address defined by "bootm_low" is
35997d721e34SBartlomiej Sieka		  also the base of the initial memory mapping for the Linux
3600c3624e6eSGrant Likely		  kernel -- see the description of CONFIG_SYS_BOOTMAPSZ and
3601c3624e6eSGrant Likely		  bootm_mapsize.
3602c3624e6eSGrant Likely
3603c3624e6eSGrant Likely  bootm_mapsize - Size of the initial memory mapping for the Linux kernel.
3604c3624e6eSGrant Likely		  This variable is given as a hexadecimal number and it
3605c3624e6eSGrant Likely		  defines the size of the memory region starting at base
3606c3624e6eSGrant Likely		  address bootm_low that is accessible by the Linux kernel
3607c3624e6eSGrant Likely		  during early boot.  If unset, CONFIG_SYS_BOOTMAPSZ is used
3608c3624e6eSGrant Likely		  as the default value if it is defined, and bootm_size is
3609c3624e6eSGrant Likely		  used otherwise.
36107d721e34SBartlomiej Sieka
36117d721e34SBartlomiej Sieka  bootm_size	- Memory range available for image processing in the bootm
36127d721e34SBartlomiej Sieka		  command can be restricted. This variable is given as
36137d721e34SBartlomiej Sieka		  a hexadecimal number and defines the size of the region
36147d721e34SBartlomiej Sieka		  allowed for use by the bootm command. See also "bootm_low"
36157d721e34SBartlomiej Sieka		  environment variable.
36167d721e34SBartlomiej Sieka
36174bae9090SBartlomiej Sieka  updatefile	- Location of the software update file on a TFTP server, used
36184bae9090SBartlomiej Sieka		  by the automatic software update feature. Please refer to
36194bae9090SBartlomiej Sieka		  documentation in doc/README.update for more details.
36204bae9090SBartlomiej Sieka
3621c609719bSwdenk  autoload	- if set to "no" (any string beginning with 'n'),
3622c609719bSwdenk		  "bootp" will just load perform a lookup of the
3623c609719bSwdenk		  configuration from the BOOTP server, but not try to
3624c609719bSwdenk		  load any image using TFTP
3625c609719bSwdenk
3626c609719bSwdenk  autostart	- if set to "yes", an image loaded using the "bootp",
3627c609719bSwdenk		  "rarpboot", "tftpboot" or "diskboot" commands will
3628c609719bSwdenk		  be automatically started (by internally calling
3629c609719bSwdenk		  "bootm")
3630c609719bSwdenk
36314a6fd34bSwdenk		  If set to "no", a standalone image passed to the
36324a6fd34bSwdenk		  "bootm" command will be copied to the load address
36334a6fd34bSwdenk		  (and eventually uncompressed), but NOT be started.
36344a6fd34bSwdenk		  This can be used to load and uncompress arbitrary
36354a6fd34bSwdenk		  data.
36364a6fd34bSwdenk
3637a28afca5SDavid A. Long  fdt_high	- if set this restricts the maximum address that the
3638a28afca5SDavid A. Long		  flattened device tree will be copied into upon boot.
3639a28afca5SDavid A. Long		  If this is set to the special value 0xFFFFFFFF then
3640a28afca5SDavid A. Long		  the fdt will not be copied at all on boot.  For this
3641a28afca5SDavid A. Long		  to work it must reside in writable memory, have
3642a28afca5SDavid A. Long		  sufficient padding on the end of it for u-boot to
3643a28afca5SDavid A. Long		  add the information it needs into it, and the memory
3644a28afca5SDavid A. Long		  must be accessible by the kernel.
3645a28afca5SDavid A. Long
3646eea63e05SSimon Glass  fdtcontroladdr- if set this is the address of the control flattened
3647eea63e05SSimon Glass		  device tree used by U-Boot when CONFIG_OF_CONTROL is
3648eea63e05SSimon Glass		  defined.
3649eea63e05SSimon Glass
365017ea1177Swdenk  i2cfast	- (PPC405GP|PPC405EP only)
365117ea1177Swdenk		  if set to 'y' configures Linux I2C driver for fast
365217ea1177Swdenk		  mode (400kHZ). This environment variable is used in
365317ea1177Swdenk		  initialization code. So, for changes to be effective
365417ea1177Swdenk		  it must be saved and board must be reset.
365517ea1177Swdenk
3656c609719bSwdenk  initrd_high	- restrict positioning of initrd images:
3657c609719bSwdenk		  If this variable is not set, initrd images will be
3658c609719bSwdenk		  copied to the highest possible address in RAM; this
3659c609719bSwdenk		  is usually what you want since it allows for
3660c609719bSwdenk		  maximum initrd size. If for some reason you want to
3661c609719bSwdenk		  make sure that the initrd image is loaded below the
36626d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		  CONFIG_SYS_BOOTMAPSZ limit, you can set this environment
3663c609719bSwdenk		  variable to a value of "no" or "off" or "0".
3664c609719bSwdenk		  Alternatively, you can set it to a maximum upper
3665c609719bSwdenk		  address to use (U-Boot will still check that it
3666c609719bSwdenk		  does not overwrite the U-Boot stack and data).
3667c609719bSwdenk
3668c609719bSwdenk		  For instance, when you have a system with 16 MB
36697152b1d0Swdenk		  RAM, and want to reserve 4 MB from use by Linux,
3670c609719bSwdenk		  you can do this by adding "mem=12M" to the value of
3671c609719bSwdenk		  the "bootargs" variable. However, now you must make
36727152b1d0Swdenk		  sure that the initrd image is placed in the first
3673c609719bSwdenk		  12 MB as well - this can be done with
3674c609719bSwdenk
3675c609719bSwdenk		  setenv initrd_high 00c00000
3676c609719bSwdenk
367738b99261Swdenk		  If you set initrd_high to 0xFFFFFFFF, this is an
367838b99261Swdenk		  indication to U-Boot that all addresses are legal
367938b99261Swdenk		  for the Linux kernel, including addresses in flash
368038b99261Swdenk		  memory. In this case U-Boot will NOT COPY the
368138b99261Swdenk		  ramdisk at all. This may be useful to reduce the
368238b99261Swdenk		  boot time on your system, but requires that this
368338b99261Swdenk		  feature is supported by your Linux kernel.
368438b99261Swdenk
3685c609719bSwdenk  ipaddr	- IP address; needed for tftpboot command
3686c609719bSwdenk
3687c609719bSwdenk  loadaddr	- Default load address for commands like "bootp",
3688dc7c9a1aSwdenk		  "rarpboot", "tftpboot", "loadb" or "diskboot"
3689c609719bSwdenk
3690c609719bSwdenk  loads_echo	- see CONFIG_LOADS_ECHO
3691c609719bSwdenk
3692c609719bSwdenk  serverip	- TFTP server IP address; needed for tftpboot command
3693c609719bSwdenk
3694c609719bSwdenk  bootretry	- see CONFIG_BOOT_RETRY_TIME
3695c609719bSwdenk
3696c609719bSwdenk  bootdelaykey	- see CONFIG_AUTOBOOT_DELAY_STR
3697c609719bSwdenk
3698c609719bSwdenk  bootstopkey	- see CONFIG_AUTOBOOT_STOP_STR
3699c609719bSwdenk
3700e2a53458SMike Frysinger  ethprime	- controls which interface is used first.
3701a3d991bdSwdenk
3702e2a53458SMike Frysinger  ethact	- controls which interface is currently active.
3703e2a53458SMike Frysinger		  For example you can do the following
3704a3d991bdSwdenk
370548690d80SHeiko Schocher		  => setenv ethact FEC
370648690d80SHeiko Schocher		  => ping 192.168.0.1 # traffic sent on FEC
370748690d80SHeiko Schocher		  => setenv ethact SCC
370848690d80SHeiko Schocher		  => ping 10.0.0.1 # traffic sent on SCC
3709a3d991bdSwdenk
3710e1692577SMatthias Fuchs  ethrotate	- When set to "no" U-Boot does not go through all
3711e1692577SMatthias Fuchs		  available network interfaces.
3712e1692577SMatthias Fuchs		  It just stays at the currently selected interface.
3713e1692577SMatthias Fuchs
3714a3d991bdSwdenk  netretry	- When set to "no" each network operation will
3715a3d991bdSwdenk		  either succeed or fail without retrying.
37166e592385Swdenk		  When set to "once" the network operation will
37176e592385Swdenk		  fail when all the available network interfaces
37186e592385Swdenk		  are tried once without success.
3719a3d991bdSwdenk		  Useful on scripts which control the retry operation
3720a3d991bdSwdenk		  themselves.
3721a3d991bdSwdenk
3722b4e2f89dSJean-Christophe PLAGNIOL-VILLARD  npe_ucode	- set load address for the NPE microcode
3723a1cf027aSJean-Christophe PLAGNIOL-VILLARD
372428cb9375SWolfgang Denk  tftpsrcport	- If this is set, the value is used for TFTP's
3725ecb0ccd9SWolfgang Denk		  UDP source port.
3726ecb0ccd9SWolfgang Denk
372728cb9375SWolfgang Denk  tftpdstport	- If this is set, the value is used for TFTP's UDP
372828cb9375SWolfgang Denk		  destination port instead of the Well Know Port 69.
372928cb9375SWolfgang Denk
3730c96f86eeSWolfgang Denk  tftpblocksize - Block size to use for TFTP transfers; if not set,
3731c96f86eeSWolfgang Denk		  we use the TFTP server's default block size
3732c96f86eeSWolfgang Denk
3733c96f86eeSWolfgang Denk  tftptimeout	- Retransmission timeout for TFTP packets (in milli-
3734c96f86eeSWolfgang Denk		  seconds, minimum value is 1000 = 1 second). Defines
3735c96f86eeSWolfgang Denk		  when a packet is considered to be lost so it has to
3736c96f86eeSWolfgang Denk		  be retransmitted. The default is 5000 = 5 seconds.
3737c96f86eeSWolfgang Denk		  Lowering this value may make downloads succeed
3738c96f86eeSWolfgang Denk		  faster in networks with high packet loss rates or
3739c96f86eeSWolfgang Denk		  with unreliable TFTP servers.
3740c96f86eeSWolfgang Denk
3741a3d991bdSwdenk  vlan		- When set to a value < 4095 the traffic over
374211ccc33fSMarcel Ziswiler		  Ethernet is encapsulated/received over 802.1q
3743a3d991bdSwdenk		  VLAN tagged frames.
3744c609719bSwdenk
3745dc0b7b0eSJason HobbsThe following image location variables contain the location of images
3746dc0b7b0eSJason Hobbsused in booting. The "Image" column gives the role of the image and is
3747dc0b7b0eSJason Hobbsnot an environment variable name. The other columns are environment
3748dc0b7b0eSJason Hobbsvariable names. "File Name" gives the name of the file on a TFTP
3749dc0b7b0eSJason Hobbsserver, "RAM Address" gives the location in RAM the image will be
3750dc0b7b0eSJason Hobbsloaded to, and "Flash Location" gives the image's address in NOR
3751dc0b7b0eSJason Hobbsflash or offset in NAND flash.
3752dc0b7b0eSJason Hobbs
3753dc0b7b0eSJason Hobbs*Note* - these variables don't have to be defined for all boards, some
3754dc0b7b0eSJason Hobbsboards currenlty use other variables for these purposes, and some
3755dc0b7b0eSJason Hobbsboards use these variables for other purposes.
3756dc0b7b0eSJason Hobbs
3757dc0b7b0eSJason HobbsImage		    File Name	     RAM Address       Flash Location
3758dc0b7b0eSJason Hobbs-----		    ---------	     -----------       --------------
3759dc0b7b0eSJason Hobbsu-boot		    u-boot	     u-boot_addr_r     u-boot_addr
3760dc0b7b0eSJason HobbsLinux kernel	    bootfile	     kernel_addr_r     kernel_addr
3761dc0b7b0eSJason Hobbsdevice tree blob    fdtfile	     fdt_addr_r	       fdt_addr
3762dc0b7b0eSJason Hobbsramdisk		    ramdiskfile	     ramdisk_addr_r    ramdisk_addr
3763dc0b7b0eSJason Hobbs
3764c609719bSwdenkThe following environment variables may be used and automatically
3765c609719bSwdenkupdated by the network boot commands ("bootp" and "rarpboot"),
3766c609719bSwdenkdepending the information provided by your boot server:
3767c609719bSwdenk
3768c609719bSwdenk  bootfile	- see above
3769c609719bSwdenk  dnsip		- IP address of your Domain Name Server
3770fe389a82Sstroese  dnsip2	- IP address of your secondary Domain Name Server
3771c609719bSwdenk  gatewayip	- IP address of the Gateway (Router) to use
3772c609719bSwdenk  hostname	- Target hostname
3773c609719bSwdenk  ipaddr	- see above
3774c609719bSwdenk  netmask	- Subnet Mask
3775c609719bSwdenk  rootpath	- Pathname of the root filesystem on the NFS server
3776c609719bSwdenk  serverip	- see above
3777c609719bSwdenk
3778c609719bSwdenk
3779c609719bSwdenkThere are two special Environment Variables:
3780c609719bSwdenk
3781c609719bSwdenk  serial#	- contains hardware identification information such
3782c609719bSwdenk		  as type string and/or serial number
3783c609719bSwdenk  ethaddr	- Ethernet address
3784c609719bSwdenk
3785c609719bSwdenkThese variables can be set only once (usually during manufacturing of
3786c609719bSwdenkthe board). U-Boot refuses to delete or overwrite these variables
3787c609719bSwdenkonce they have been set once.
3788c609719bSwdenk
3789c609719bSwdenk
3790c1551ea8SstroeseFurther special Environment Variables:
3791c1551ea8Sstroese
3792c1551ea8Sstroese  ver		- Contains the U-Boot version string as printed
3793c1551ea8Sstroese		  with the "version" command. This variable is
3794c1551ea8Sstroese		  readonly (see CONFIG_VERSION_VARIABLE).
3795c1551ea8Sstroese
3796c1551ea8Sstroese
3797c609719bSwdenkPlease note that changes to some configuration parameters may take
3798c609719bSwdenkonly effect after the next boot (yes, that's just like Windoze :-).
3799c609719bSwdenk
3800c609719bSwdenk
3801f07771ccSwdenkCommand Line Parsing:
3802f07771ccSwdenk=====================
3803f07771ccSwdenk
3804f07771ccSwdenkThere are two different command line parsers available with U-Boot:
38057152b1d0Swdenkthe old "simple" one, and the much more powerful "hush" shell:
3806f07771ccSwdenk
3807f07771ccSwdenkOld, simple command line parser:
3808f07771ccSwdenk--------------------------------
3809f07771ccSwdenk
3810f07771ccSwdenk- supports environment variables (through setenv / saveenv commands)
3811f07771ccSwdenk- several commands on one line, separated by ';'
3812fe126d8bSWolfgang Denk- variable substitution using "... ${name} ..." syntax
3813f07771ccSwdenk- special characters ('$', ';') can be escaped by prefixing with '\',
3814f07771ccSwdenk  for example:
3815fe126d8bSWolfgang Denk	setenv bootcmd bootm \${address}
3816f07771ccSwdenk- You can also escape text by enclosing in single apostrophes, for example:
3817f07771ccSwdenk	setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off'
3818f07771ccSwdenk
3819f07771ccSwdenkHush shell:
3820f07771ccSwdenk-----------
3821f07771ccSwdenk
3822f07771ccSwdenk- similar to Bourne shell, with control structures like
3823f07771ccSwdenk  if...then...else...fi, for...do...done; while...do...done,
3824f07771ccSwdenk  until...do...done, ...
3825f07771ccSwdenk- supports environment ("global") variables (through setenv / saveenv
3826f07771ccSwdenk  commands) and local shell variables (through standard shell syntax
3827f07771ccSwdenk  "name=value"); only environment variables can be used with "run"
3828f07771ccSwdenk  command
3829f07771ccSwdenk
3830f07771ccSwdenkGeneral rules:
3831f07771ccSwdenk--------------
3832f07771ccSwdenk
3833f07771ccSwdenk(1) If a command line (or an environment variable executed by a "run"
3834f07771ccSwdenk    command) contains several commands separated by semicolon, and
3835f07771ccSwdenk    one of these commands fails, then the remaining commands will be
3836f07771ccSwdenk    executed anyway.
3837f07771ccSwdenk
3838f07771ccSwdenk(2) If you execute several variables with one call to run (i. e.
383911ccc33fSMarcel Ziswiler    calling run with a list of variables as arguments), any failing
3840f07771ccSwdenk    command will cause "run" to terminate, i. e. the remaining
3841f07771ccSwdenk    variables are not executed.
3842f07771ccSwdenk
3843c609719bSwdenkNote for Redundant Ethernet Interfaces:
3844c609719bSwdenk=======================================
3845c609719bSwdenk
384611ccc33fSMarcel ZiswilerSome boards come with redundant Ethernet interfaces; U-Boot supports
3847c609719bSwdenksuch configurations and is capable of automatic selection of a
38487152b1d0Swdenk"working" interface when needed. MAC assignment works as follows:
3849c609719bSwdenk
3850c609719bSwdenkNetwork interfaces are numbered eth0, eth1, eth2, ... Corresponding
3851c609719bSwdenkMAC addresses can be stored in the environment as "ethaddr" (=>eth0),
3852c609719bSwdenk"eth1addr" (=>eth1), "eth2addr", ...
3853c609719bSwdenk
3854c609719bSwdenkIf the network interface stores some valid MAC address (for instance
3855c609719bSwdenkin SROM), this is used as default address if there is NO correspon-
3856c609719bSwdenkding setting in the environment; if the corresponding environment
3857c609719bSwdenkvariable is set, this overrides the settings in the card; that means:
3858c609719bSwdenk
3859c609719bSwdenko If the SROM has a valid MAC address, and there is no address in the
3860c609719bSwdenk  environment, the SROM's address is used.
3861c609719bSwdenk
3862c609719bSwdenko If there is no valid address in the SROM, and a definition in the
3863c609719bSwdenk  environment exists, then the value from the environment variable is
3864c609719bSwdenk  used.
3865c609719bSwdenk
3866c609719bSwdenko If both the SROM and the environment contain a MAC address, and
3867c609719bSwdenk  both addresses are the same, this MAC address is used.
3868c609719bSwdenk
3869c609719bSwdenko If both the SROM and the environment contain a MAC address, and the
3870c609719bSwdenk  addresses differ, the value from the environment is used and a
3871c609719bSwdenk  warning is printed.
3872c609719bSwdenk
3873c609719bSwdenko If neither SROM nor the environment contain a MAC address, an error
3874c609719bSwdenk  is raised.
3875c609719bSwdenk
3876ecee9324SBen WarrenIf Ethernet drivers implement the 'write_hwaddr' function, valid MAC addresses
3877ecee9324SBen Warrenwill be programmed into hardware as part of the initialization process.	 This
3878ecee9324SBen Warrenmay be skipped by setting the appropriate 'ethmacskip' environment variable.
3879ecee9324SBen WarrenThe naming convention is as follows:
3880ecee9324SBen Warren"ethmacskip" (=>eth0), "eth1macskip" (=>eth1) etc.
3881c609719bSwdenk
3882c609719bSwdenkImage Formats:
3883c609719bSwdenk==============
3884c609719bSwdenk
38853310c549SMarian BalakowiczU-Boot is capable of booting (and performing other auxiliary operations on)
38863310c549SMarian Balakowiczimages in two formats:
38873310c549SMarian Balakowicz
38883310c549SMarian BalakowiczNew uImage format (FIT)
38893310c549SMarian Balakowicz-----------------------
38903310c549SMarian Balakowicz
38913310c549SMarian BalakowiczFlexible and powerful format based on Flattened Image Tree -- FIT (similar
38923310c549SMarian Balakowiczto Flattened Device Tree). It allows the use of images with multiple
38933310c549SMarian Balakowiczcomponents (several kernels, ramdisks, etc.), with contents protected by
38943310c549SMarian BalakowiczSHA1, MD5 or CRC32. More details are found in the doc/uImage.FIT directory.
38953310c549SMarian Balakowicz
38963310c549SMarian Balakowicz
38973310c549SMarian BalakowiczOld uImage format
38983310c549SMarian Balakowicz-----------------
38993310c549SMarian Balakowicz
39003310c549SMarian BalakowiczOld image format is based on binary files which can be basically anything,
39013310c549SMarian Balakowiczpreceded by a special header; see the definitions in include/image.h for
39023310c549SMarian Balakowiczdetails; basically, the header defines the following image properties:
3903c609719bSwdenk
3904c609719bSwdenk* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD,
3905c609719bSwdenk  4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks,
3906f5ed9e39SPeter Tyser  LynxOS, pSOS, QNX, RTEMS, INTEGRITY;
3907f5ed9e39SPeter Tyser  Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, LynxOS,
3908f5ed9e39SPeter Tyser  INTEGRITY).
39097b64fef3SWolfgang Denk* Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86,
3910afc1ce82SMacpaul Lin  IA64, MIPS, NDS32, Nios II, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit;
3911afc1ce82SMacpaul Lin  Currently supported: ARM, AVR32, Intel x86, MIPS, NDS32, Nios II, PowerPC).
3912c29fdfc1Swdenk* Compression Type (uncompressed, gzip, bzip2)
3913c609719bSwdenk* Load Address
3914c609719bSwdenk* Entry Point
3915c609719bSwdenk* Image Name
3916c609719bSwdenk* Image Timestamp
3917c609719bSwdenk
3918c609719bSwdenkThe header is marked by a special Magic Number, and both the header
3919c609719bSwdenkand the data portions of the image are secured against corruption by
3920c609719bSwdenkCRC32 checksums.
3921c609719bSwdenk
3922c609719bSwdenk
3923c609719bSwdenkLinux Support:
3924c609719bSwdenk==============
3925c609719bSwdenk
3926c609719bSwdenkAlthough U-Boot should support any OS or standalone application
39277152b1d0Swdenkeasily, the main focus has always been on Linux during the design of
3928c609719bSwdenkU-Boot.
3929c609719bSwdenk
3930c609719bSwdenkU-Boot includes many features that so far have been part of some
3931c609719bSwdenkspecial "boot loader" code within the Linux kernel. Also, any
3932c609719bSwdenk"initrd" images to be used are no longer part of one big Linux image;
3933c609719bSwdenkinstead, kernel and "initrd" are separate images. This implementation
39347152b1d0Swdenkserves several purposes:
3935c609719bSwdenk
3936c609719bSwdenk- the same features can be used for other OS or standalone
3937c609719bSwdenk  applications (for instance: using compressed images to reduce the
3938c609719bSwdenk  Flash memory footprint)
3939c609719bSwdenk
3940c609719bSwdenk- it becomes much easier to port new Linux kernel versions because
39417152b1d0Swdenk  lots of low-level, hardware dependent stuff are done by U-Boot
3942c609719bSwdenk
3943c609719bSwdenk- the same Linux kernel image can now be used with different "initrd"
3944c609719bSwdenk  images; of course this also means that different kernel images can
3945c609719bSwdenk  be run with the same "initrd". This makes testing easier (you don't
3946c609719bSwdenk  have to build a new "zImage.initrd" Linux image when you just
3947c609719bSwdenk  change a file in your "initrd"). Also, a field-upgrade of the
3948c609719bSwdenk  software is easier now.
3949c609719bSwdenk
3950c609719bSwdenk
3951c609719bSwdenkLinux HOWTO:
3952c609719bSwdenk============
3953c609719bSwdenk
3954c609719bSwdenkPorting Linux to U-Boot based systems:
3955c609719bSwdenk---------------------------------------
3956c609719bSwdenk
3957c609719bSwdenkU-Boot cannot save you from doing all the necessary modifications to
3958c609719bSwdenkconfigure the Linux device drivers for use with your target hardware
3959c609719bSwdenk(no, we don't intend to provide a full virtual machine interface to
3960c609719bSwdenkLinux :-).
3961c609719bSwdenk
3962a47a12beSStefan RoeseBut now you can ignore ALL boot loader code (in arch/powerpc/mbxboot).
3963c609719bSwdenk
3964c609719bSwdenkJust make sure your machine specific header file (for instance
3965c609719bSwdenkinclude/asm-ppc/tqm8xx.h) includes the same definition of the Board
39661dc30693SMarkus HeidelbergInformation structure as we define in include/asm-<arch>/u-boot.h,
39671dc30693SMarkus Heidelbergand make sure that your definition of IMAP_ADDR uses the same value
39686d0f6bcfSJean-Christophe PLAGNIOL-VILLARDas your U-Boot configuration in CONFIG_SYS_IMMR.
3969c609719bSwdenk
3970c609719bSwdenk
3971c609719bSwdenkConfiguring the Linux kernel:
3972c609719bSwdenk-----------------------------
3973c609719bSwdenk
3974c609719bSwdenkNo specific requirements for U-Boot. Make sure you have some root
3975c609719bSwdenkdevice (initial ramdisk, NFS) for your target system.
3976c609719bSwdenk
3977c609719bSwdenk
3978c609719bSwdenkBuilding a Linux Image:
3979c609719bSwdenk-----------------------
3980c609719bSwdenk
398124ee89b9SwdenkWith U-Boot, "normal" build targets like "zImage" or "bzImage" are
398224ee89b9Swdenknot used. If you use recent kernel source, a new build target
398324ee89b9Swdenk"uImage" will exist which automatically builds an image usable by
398424ee89b9SwdenkU-Boot. Most older kernels also have support for a "pImage" target,
398524ee89b9Swdenkwhich was introduced for our predecessor project PPCBoot and uses a
398624ee89b9Swdenk100% compatible format.
3987c609719bSwdenk
3988c609719bSwdenkExample:
3989c609719bSwdenk
3990c609719bSwdenk	make TQM850L_config
3991c609719bSwdenk	make oldconfig
3992c609719bSwdenk	make dep
399324ee89b9Swdenk	make uImage
3994c609719bSwdenk
399524ee89b9SwdenkThe "uImage" build target uses a special tool (in 'tools/mkimage') to
399624ee89b9Swdenkencapsulate a compressed Linux kernel image with header	 information,
399724ee89b9SwdenkCRC32 checksum etc. for use with U-Boot. This is what we are doing:
3998c609719bSwdenk
399924ee89b9Swdenk* build a standard "vmlinux" kernel image (in ELF binary format):
400024ee89b9Swdenk
400124ee89b9Swdenk* convert the kernel into a raw binary image:
400224ee89b9Swdenk
400324ee89b9Swdenk	${CROSS_COMPILE}-objcopy -O binary \
400424ee89b9Swdenk				 -R .note -R .comment \
400524ee89b9Swdenk				 -S vmlinux linux.bin
400624ee89b9Swdenk
400724ee89b9Swdenk* compress the binary image:
400824ee89b9Swdenk
400924ee89b9Swdenk	gzip -9 linux.bin
401024ee89b9Swdenk
401124ee89b9Swdenk* package compressed binary image for U-Boot:
401224ee89b9Swdenk
401324ee89b9Swdenk	mkimage -A ppc -O linux -T kernel -C gzip \
401424ee89b9Swdenk		-a 0 -e 0 -n "Linux Kernel Image" \
401524ee89b9Swdenk		-d linux.bin.gz uImage
401624ee89b9Swdenk
401724ee89b9Swdenk
401824ee89b9SwdenkThe "mkimage" tool can also be used to create ramdisk images for use
401924ee89b9Swdenkwith U-Boot, either separated from the Linux kernel image, or
402024ee89b9Swdenkcombined into one file. "mkimage" encapsulates the images with a 64
402124ee89b9Swdenkbyte header containing information about target architecture,
402224ee89b9Swdenkoperating system, image type, compression method, entry points, time
402324ee89b9Swdenkstamp, CRC32 checksums, etc.
402424ee89b9Swdenk
402524ee89b9Swdenk"mkimage" can be called in two ways: to verify existing images and
402624ee89b9Swdenkprint the header information, or to build new images.
4027c609719bSwdenk
4028c609719bSwdenkIn the first form (with "-l" option) mkimage lists the information
4029c609719bSwdenkcontained in the header of an existing U-Boot image; this includes
4030c609719bSwdenkchecksum verification:
4031c609719bSwdenk
4032c609719bSwdenk	tools/mkimage -l image
4033c609719bSwdenk	  -l ==> list image header information
4034c609719bSwdenk
4035c609719bSwdenkThe second form (with "-d" option) is used to build a U-Boot image
4036c609719bSwdenkfrom a "data file" which is used as image payload:
4037c609719bSwdenk
4038c609719bSwdenk	tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \
4039c609719bSwdenk		      -n name -d data_file image
4040c609719bSwdenk	  -A ==> set architecture to 'arch'
4041c609719bSwdenk	  -O ==> set operating system to 'os'
4042c609719bSwdenk	  -T ==> set image type to 'type'
4043c609719bSwdenk	  -C ==> set compression type 'comp'
4044c609719bSwdenk	  -a ==> set load address to 'addr' (hex)
4045c609719bSwdenk	  -e ==> set entry point to 'ep' (hex)
4046c609719bSwdenk	  -n ==> set image name to 'name'
4047c609719bSwdenk	  -d ==> use image data from 'datafile'
4048c609719bSwdenk
404969459791SwdenkRight now, all Linux kernels for PowerPC systems use the same load
405069459791Swdenkaddress (0x00000000), but the entry point address depends on the
405169459791Swdenkkernel version:
4052c609719bSwdenk
4053c609719bSwdenk- 2.2.x kernels have the entry point at 0x0000000C,
405424ee89b9Swdenk- 2.3.x and later kernels have the entry point at 0x00000000.
4055c609719bSwdenk
4056c609719bSwdenkSo a typical call to build a U-Boot image would read:
4057c609719bSwdenk
405824ee89b9Swdenk	-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
405924ee89b9Swdenk	> -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \
4060a47a12beSStefan Roese	> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz \
406124ee89b9Swdenk	> examples/uImage.TQM850L
406224ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
4063c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
4064c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (gzip compressed)
4065c609719bSwdenk	Data Size:    335725 Bytes = 327.86 kB = 0.32 MB
4066c609719bSwdenk	Load Address: 0x00000000
406724ee89b9Swdenk	Entry Point:  0x00000000
4068c609719bSwdenk
4069c609719bSwdenkTo verify the contents of the image (or check for corruption):
4070c609719bSwdenk
407124ee89b9Swdenk	-> tools/mkimage -l examples/uImage.TQM850L
407224ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
4073c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
4074c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (gzip compressed)
4075c609719bSwdenk	Data Size:    335725 Bytes = 327.86 kB = 0.32 MB
4076c609719bSwdenk	Load Address: 0x00000000
407724ee89b9Swdenk	Entry Point:  0x00000000
4078c609719bSwdenk
4079c609719bSwdenkNOTE: for embedded systems where boot time is critical you can trade
4080c609719bSwdenkspeed for memory and install an UNCOMPRESSED image instead: this
4081c609719bSwdenkneeds more space in Flash, but boots much faster since it does not
4082c609719bSwdenkneed to be uncompressed:
4083c609719bSwdenk
4084a47a12beSStefan Roese	-> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz
408524ee89b9Swdenk	-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
408624ee89b9Swdenk	> -A ppc -O linux -T kernel -C none -a 0 -e 0 \
4087a47a12beSStefan Roese	> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux \
408824ee89b9Swdenk	> examples/uImage.TQM850L-uncompressed
408924ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
4090c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
4091c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (uncompressed)
4092c609719bSwdenk	Data Size:    792160 Bytes = 773.59 kB = 0.76 MB
4093c609719bSwdenk	Load Address: 0x00000000
409424ee89b9Swdenk	Entry Point:  0x00000000
4095c609719bSwdenk
4096c609719bSwdenk
4097c609719bSwdenkSimilar you can build U-Boot images from a 'ramdisk.image.gz' file
4098c609719bSwdenkwhen your kernel is intended to use an initial ramdisk:
4099c609719bSwdenk
4100c609719bSwdenk	-> tools/mkimage -n 'Simple Ramdisk Image' \
4101c609719bSwdenk	> -A ppc -O linux -T ramdisk -C gzip \
4102c609719bSwdenk	> -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd
4103c609719bSwdenk	Image Name:   Simple Ramdisk Image
4104c609719bSwdenk	Created:      Wed Jan 12 14:01:50 2000
4105c609719bSwdenk	Image Type:   PowerPC Linux RAMDisk Image (gzip compressed)
4106c609719bSwdenk	Data Size:    566530 Bytes = 553.25 kB = 0.54 MB
4107c609719bSwdenk	Load Address: 0x00000000
4108c609719bSwdenk	Entry Point:  0x00000000
4109c609719bSwdenk
4110c609719bSwdenk
4111c609719bSwdenkInstalling a Linux Image:
4112c609719bSwdenk-------------------------
4113c609719bSwdenk
4114c609719bSwdenkTo downloading a U-Boot image over the serial (console) interface,
4115c609719bSwdenkyou must convert the image to S-Record format:
4116c609719bSwdenk
4117c609719bSwdenk	objcopy -I binary -O srec examples/image examples/image.srec
4118c609719bSwdenk
4119c609719bSwdenkThe 'objcopy' does not understand the information in the U-Boot
4120c609719bSwdenkimage header, so the resulting S-Record file will be relative to
4121c609719bSwdenkaddress 0x00000000. To load it to a given address, you need to
4122c609719bSwdenkspecify the target address as 'offset' parameter with the 'loads'
4123c609719bSwdenkcommand.
4124c609719bSwdenk
4125c609719bSwdenkExample: install the image to address 0x40100000 (which on the
4126c609719bSwdenkTQM8xxL is in the first Flash bank):
4127c609719bSwdenk
4128c609719bSwdenk	=> erase 40100000 401FFFFF
4129c609719bSwdenk
4130c609719bSwdenk	.......... done
4131c609719bSwdenk	Erased 8 sectors
4132c609719bSwdenk
4133c609719bSwdenk	=> loads 40100000
4134c609719bSwdenk	## Ready for S-Record download ...
4135c609719bSwdenk	~>examples/image.srec
4136c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 12 13 ...
4137c609719bSwdenk	...
4138c609719bSwdenk	15989 15990 15991 15992
4139c609719bSwdenk	[file transfer complete]
4140c609719bSwdenk	[connected]
4141c609719bSwdenk	## Start Addr = 0x00000000
4142c609719bSwdenk
4143c609719bSwdenk
4144c609719bSwdenkYou can check the success of the download using the 'iminfo' command;
4145c609719bSwdenkthis includes a checksum verification so you can be sure no data
4146c609719bSwdenkcorruption happened:
4147c609719bSwdenk
4148c609719bSwdenk	=> imi 40100000
4149c609719bSwdenk
4150c609719bSwdenk	## Checking Image at 40100000 ...
4151c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
4152c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
4153c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
4154c609719bSwdenk	   Load Address: 00000000
4155c609719bSwdenk	   Entry Point:	 0000000c
4156c609719bSwdenk	   Verifying Checksum ... OK
4157c609719bSwdenk
4158c609719bSwdenk
4159c609719bSwdenkBoot Linux:
4160c609719bSwdenk-----------
4161c609719bSwdenk
4162c609719bSwdenkThe "bootm" command is used to boot an application that is stored in
4163c609719bSwdenkmemory (RAM or Flash). In case of a Linux kernel image, the contents
4164c609719bSwdenkof the "bootargs" environment variable is passed to the kernel as
4165c609719bSwdenkparameters. You can check and modify this variable using the
4166c609719bSwdenk"printenv" and "setenv" commands:
4167c609719bSwdenk
4168c609719bSwdenk
4169c609719bSwdenk	=> printenv bootargs
4170c609719bSwdenk	bootargs=root=/dev/ram
4171c609719bSwdenk
4172c609719bSwdenk	=> setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
4173c609719bSwdenk
4174c609719bSwdenk	=> printenv bootargs
4175c609719bSwdenk	bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
4176c609719bSwdenk
4177c609719bSwdenk	=> bootm 40020000
4178c609719bSwdenk	## Booting Linux kernel at 40020000 ...
4179c609719bSwdenk	   Image Name:	 2.2.13 for NFS on TQM850L
4180c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
4181c609719bSwdenk	   Data Size:	 381681 Bytes = 372 kB = 0 MB
4182c609719bSwdenk	   Load Address: 00000000
4183c609719bSwdenk	   Entry Point:	 0000000c
4184c609719bSwdenk	   Verifying Checksum ... OK
4185c609719bSwdenk	   Uncompressing Kernel Image ... OK
4186c609719bSwdenk	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
4187c609719bSwdenk	Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
4188c609719bSwdenk	time_init: decrementer frequency = 187500000/60
4189c609719bSwdenk	Calibrating delay loop... 49.77 BogoMIPS
4190c609719bSwdenk	Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000]
4191c609719bSwdenk	...
4192c609719bSwdenk
419311ccc33fSMarcel ZiswilerIf you want to boot a Linux kernel with initial RAM disk, you pass
41947152b1d0Swdenkthe memory addresses of both the kernel and the initrd image (PPBCOOT
4195c609719bSwdenkformat!) to the "bootm" command:
4196c609719bSwdenk
4197c609719bSwdenk	=> imi 40100000 40200000
4198c609719bSwdenk
4199c609719bSwdenk	## Checking Image at 40100000 ...
4200c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
4201c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
4202c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
4203c609719bSwdenk	   Load Address: 00000000
4204c609719bSwdenk	   Entry Point:	 0000000c
4205c609719bSwdenk	   Verifying Checksum ... OK
4206c609719bSwdenk
4207c609719bSwdenk	## Checking Image at 40200000 ...
4208c609719bSwdenk	   Image Name:	 Simple Ramdisk Image
4209c609719bSwdenk	   Image Type:	 PowerPC Linux RAMDisk Image (gzip compressed)
4210c609719bSwdenk	   Data Size:	 566530 Bytes = 553 kB = 0 MB
4211c609719bSwdenk	   Load Address: 00000000
4212c609719bSwdenk	   Entry Point:	 00000000
4213c609719bSwdenk	   Verifying Checksum ... OK
4214c609719bSwdenk
4215c609719bSwdenk	=> bootm 40100000 40200000
4216c609719bSwdenk	## Booting Linux kernel at 40100000 ...
4217c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
4218c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
4219c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
4220c609719bSwdenk	   Load Address: 00000000
4221c609719bSwdenk	   Entry Point:	 0000000c
4222c609719bSwdenk	   Verifying Checksum ... OK
4223c609719bSwdenk	   Uncompressing Kernel Image ... OK
4224c609719bSwdenk	## Loading RAMDisk Image at 40200000 ...
4225c609719bSwdenk	   Image Name:	 Simple Ramdisk Image
4226c609719bSwdenk	   Image Type:	 PowerPC Linux RAMDisk Image (gzip compressed)
4227c609719bSwdenk	   Data Size:	 566530 Bytes = 553 kB = 0 MB
4228c609719bSwdenk	   Load Address: 00000000
4229c609719bSwdenk	   Entry Point:	 00000000
4230c609719bSwdenk	   Verifying Checksum ... OK
4231c609719bSwdenk	   Loading Ramdisk ... OK
4232c609719bSwdenk	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
4233c609719bSwdenk	Boot arguments: root=/dev/ram
4234c609719bSwdenk	time_init: decrementer frequency = 187500000/60
4235c609719bSwdenk	Calibrating delay loop... 49.77 BogoMIPS
4236c609719bSwdenk	...
4237c609719bSwdenk	RAMDISK: Compressed image found at block 0
4238c609719bSwdenk	VFS: Mounted root (ext2 filesystem).
4239c609719bSwdenk
4240c609719bSwdenk	bash#
4241c609719bSwdenk
42420267768eSMatthew McClintockBoot Linux and pass a flat device tree:
42430267768eSMatthew McClintock-----------
42440267768eSMatthew McClintock
42450267768eSMatthew McClintockFirst, U-Boot must be compiled with the appropriate defines. See the section
42460267768eSMatthew McClintocktitled "Linux Kernel Interface" above for a more in depth explanation. The
42470267768eSMatthew McClintockfollowing is an example of how to start a kernel and pass an updated
42480267768eSMatthew McClintockflat device tree:
42490267768eSMatthew McClintock
42500267768eSMatthew McClintock=> print oftaddr
42510267768eSMatthew McClintockoftaddr=0x300000
42520267768eSMatthew McClintock=> print oft
42530267768eSMatthew McClintockoft=oftrees/mpc8540ads.dtb
42540267768eSMatthew McClintock=> tftp $oftaddr $oft
42550267768eSMatthew McClintockSpeed: 1000, full duplex
42560267768eSMatthew McClintockUsing TSEC0 device
42570267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.101
42580267768eSMatthew McClintockFilename 'oftrees/mpc8540ads.dtb'.
42590267768eSMatthew McClintockLoad address: 0x300000
42600267768eSMatthew McClintockLoading: #
42610267768eSMatthew McClintockdone
42620267768eSMatthew McClintockBytes transferred = 4106 (100a hex)
42630267768eSMatthew McClintock=> tftp $loadaddr $bootfile
42640267768eSMatthew McClintockSpeed: 1000, full duplex
42650267768eSMatthew McClintockUsing TSEC0 device
42660267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.2
42670267768eSMatthew McClintockFilename 'uImage'.
42680267768eSMatthew McClintockLoad address: 0x200000
42690267768eSMatthew McClintockLoading:############
42700267768eSMatthew McClintockdone
42710267768eSMatthew McClintockBytes transferred = 1029407 (fb51f hex)
42720267768eSMatthew McClintock=> print loadaddr
42730267768eSMatthew McClintockloadaddr=200000
42740267768eSMatthew McClintock=> print oftaddr
42750267768eSMatthew McClintockoftaddr=0x300000
42760267768eSMatthew McClintock=> bootm $loadaddr - $oftaddr
42770267768eSMatthew McClintock## Booting image at 00200000 ...
42780267768eSMatthew McClintock   Image Name:	 Linux-2.6.17-dirty
42790267768eSMatthew McClintock   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
42800267768eSMatthew McClintock   Data Size:	 1029343 Bytes = 1005.2 kB
42810267768eSMatthew McClintock   Load Address: 00000000
42820267768eSMatthew McClintock   Entry Point:	 00000000
42830267768eSMatthew McClintock   Verifying Checksum ... OK
42840267768eSMatthew McClintock   Uncompressing Kernel Image ... OK
42850267768eSMatthew McClintockBooting using flat device tree at 0x300000
42860267768eSMatthew McClintockUsing MPC85xx ADS machine description
42870267768eSMatthew McClintockMemory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb
42880267768eSMatthew McClintock[snip]
42890267768eSMatthew McClintock
42900267768eSMatthew McClintock
42916069ff26SwdenkMore About U-Boot Image Types:
42926069ff26Swdenk------------------------------
42936069ff26Swdenk
42946069ff26SwdenkU-Boot supports the following image types:
42956069ff26Swdenk
42966069ff26Swdenk   "Standalone Programs" are directly runnable in the environment
42976069ff26Swdenk	provided by U-Boot; it is expected that (if they behave
42986069ff26Swdenk	well) you can continue to work in U-Boot after return from
42996069ff26Swdenk	the Standalone Program.
43006069ff26Swdenk   "OS Kernel Images" are usually images of some Embedded OS which
43016069ff26Swdenk	will take over control completely. Usually these programs
43026069ff26Swdenk	will install their own set of exception handlers, device
43036069ff26Swdenk	drivers, set up the MMU, etc. - this means, that you cannot
43046069ff26Swdenk	expect to re-enter U-Boot except by resetting the CPU.
43056069ff26Swdenk   "RAMDisk Images" are more or less just data blocks, and their
43066069ff26Swdenk	parameters (address, size) are passed to an OS kernel that is
43076069ff26Swdenk	being started.
43086069ff26Swdenk   "Multi-File Images" contain several images, typically an OS
43096069ff26Swdenk	(Linux) kernel image and one or more data images like
43106069ff26Swdenk	RAMDisks. This construct is useful for instance when you want
43116069ff26Swdenk	to boot over the network using BOOTP etc., where the boot
43126069ff26Swdenk	server provides just a single image file, but you want to get
43136069ff26Swdenk	for instance an OS kernel and a RAMDisk image.
43146069ff26Swdenk
43156069ff26Swdenk	"Multi-File Images" start with a list of image sizes, each
43166069ff26Swdenk	image size (in bytes) specified by an "uint32_t" in network
43176069ff26Swdenk	byte order. This list is terminated by an "(uint32_t)0".
43186069ff26Swdenk	Immediately after the terminating 0 follow the images, one by
43196069ff26Swdenk	one, all aligned on "uint32_t" boundaries (size rounded up to
43206069ff26Swdenk	a multiple of 4 bytes).
43216069ff26Swdenk
43226069ff26Swdenk   "Firmware Images" are binary images containing firmware (like
43236069ff26Swdenk	U-Boot or FPGA images) which usually will be programmed to
43246069ff26Swdenk	flash memory.
43256069ff26Swdenk
43266069ff26Swdenk   "Script files" are command sequences that will be executed by
43276069ff26Swdenk	U-Boot's command interpreter; this feature is especially
43286069ff26Swdenk	useful when you configure U-Boot to use a real shell (hush)
43296069ff26Swdenk	as command interpreter.
43306069ff26Swdenk
4331c609719bSwdenk
4332c609719bSwdenkStandalone HOWTO:
4333c609719bSwdenk=================
4334c609719bSwdenk
4335c609719bSwdenkOne of the features of U-Boot is that you can dynamically load and
4336c609719bSwdenkrun "standalone" applications, which can use some resources of
4337c609719bSwdenkU-Boot like console I/O functions or interrupt services.
4338c609719bSwdenk
4339c609719bSwdenkTwo simple examples are included with the sources:
4340c609719bSwdenk
4341c609719bSwdenk"Hello World" Demo:
4342c609719bSwdenk-------------------
4343c609719bSwdenk
4344c609719bSwdenk'examples/hello_world.c' contains a small "Hello World" Demo
4345c609719bSwdenkapplication; it is automatically compiled when you build U-Boot.
4346c609719bSwdenkIt's configured to run at address 0x00040004, so you can play with it
4347c609719bSwdenklike that:
4348c609719bSwdenk
4349c609719bSwdenk	=> loads
4350c609719bSwdenk	## Ready for S-Record download ...
4351c609719bSwdenk	~>examples/hello_world.srec
4352c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 ...
4353c609719bSwdenk	[file transfer complete]
4354c609719bSwdenk	[connected]
4355c609719bSwdenk	## Start Addr = 0x00040004
4356c609719bSwdenk
4357c609719bSwdenk	=> go 40004 Hello World! This is a test.
4358c609719bSwdenk	## Starting application at 0x00040004 ...
4359c609719bSwdenk	Hello World
4360c609719bSwdenk	argc = 7
4361c609719bSwdenk	argv[0] = "40004"
4362c609719bSwdenk	argv[1] = "Hello"
4363c609719bSwdenk	argv[2] = "World!"
4364c609719bSwdenk	argv[3] = "This"
4365c609719bSwdenk	argv[4] = "is"
4366c609719bSwdenk	argv[5] = "a"
4367c609719bSwdenk	argv[6] = "test."
4368c609719bSwdenk	argv[7] = "<NULL>"
4369c609719bSwdenk	Hit any key to exit ...
4370c609719bSwdenk
4371c609719bSwdenk	## Application terminated, rc = 0x0
4372c609719bSwdenk
4373c609719bSwdenkAnother example, which demonstrates how to register a CPM interrupt
4374c609719bSwdenkhandler with the U-Boot code, can be found in 'examples/timer.c'.
4375c609719bSwdenkHere, a CPM timer is set up to generate an interrupt every second.
4376c609719bSwdenkThe interrupt service routine is trivial, just printing a '.'
4377c609719bSwdenkcharacter, but this is just a demo program. The application can be
4378c609719bSwdenkcontrolled by the following keys:
4379c609719bSwdenk
4380c609719bSwdenk	? - print current values og the CPM Timer registers
4381c609719bSwdenk	b - enable interrupts and start timer
4382c609719bSwdenk	e - stop timer and disable interrupts
4383c609719bSwdenk	q - quit application
4384c609719bSwdenk
4385c609719bSwdenk	=> loads
4386c609719bSwdenk	## Ready for S-Record download ...
4387c609719bSwdenk	~>examples/timer.srec
4388c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 ...
4389c609719bSwdenk	[file transfer complete]
4390c609719bSwdenk	[connected]
4391c609719bSwdenk	## Start Addr = 0x00040004
4392c609719bSwdenk
4393c609719bSwdenk	=> go 40004
4394c609719bSwdenk	## Starting application at 0x00040004 ...
4395c609719bSwdenk	TIMERS=0xfff00980
4396c609719bSwdenk	Using timer 1
4397c609719bSwdenk	  tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0
4398c609719bSwdenk
4399c609719bSwdenkHit 'b':
4400c609719bSwdenk	[q, b, e, ?] Set interval 1000000 us
4401c609719bSwdenk	Enabling timer
4402c609719bSwdenkHit '?':
4403c609719bSwdenk	[q, b, e, ?] ........
4404c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0
4405c609719bSwdenkHit '?':
4406c609719bSwdenk	[q, b, e, ?] .
4407c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0
4408c609719bSwdenkHit '?':
4409c609719bSwdenk	[q, b, e, ?] .
4410c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0
4411c609719bSwdenkHit '?':
4412c609719bSwdenk	[q, b, e, ?] .
4413c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0
4414c609719bSwdenkHit 'e':
4415c609719bSwdenk	[q, b, e, ?] ...Stopping timer
4416c609719bSwdenkHit 'q':
4417c609719bSwdenk	[q, b, e, ?] ## Application terminated, rc = 0x0
4418c609719bSwdenk
4419c609719bSwdenk
442085ec0bccSwdenkMinicom warning:
442185ec0bccSwdenk================
442285ec0bccSwdenk
44237152b1d0SwdenkOver time, many people have reported problems when trying to use the
442485ec0bccSwdenk"minicom" terminal emulation program for serial download. I (wd)
442585ec0bccSwdenkconsider minicom to be broken, and recommend not to use it. Under
4426f07771ccSwdenkUnix, I recommend to use C-Kermit for general purpose use (and
442785ec0bccSwdenkespecially for kermit binary protocol download ("loadb" command), and
442885ec0bccSwdenkuse "cu" for S-Record download ("loads" command).
442985ec0bccSwdenk
443052f52c14SwdenkNevertheless, if you absolutely want to use it try adding this
443152f52c14Swdenkconfiguration to your "File transfer protocols" section:
443252f52c14Swdenk
443352f52c14Swdenk	   Name	   Program			Name U/D FullScr IO-Red. Multi
443452f52c14Swdenk	X  kermit  /usr/bin/kermit -i -l %l -s	 Y    U	   Y	   N	  N
443552f52c14Swdenk	Y  kermit  /usr/bin/kermit -i -l %l -r	 N    D	   Y	   N	  N
443652f52c14Swdenk
443752f52c14Swdenk
4438c609719bSwdenkNetBSD Notes:
4439c609719bSwdenk=============
4440c609719bSwdenk
4441c609719bSwdenkStarting at version 0.9.2, U-Boot supports NetBSD both as host
4442c609719bSwdenk(build U-Boot) and target system (boots NetBSD/mpc8xx).
4443c609719bSwdenk
4444c609719bSwdenkBuilding requires a cross environment; it is known to work on
4445c609719bSwdenkNetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also
4446c609719bSwdenkneed gmake since the Makefiles are not compatible with BSD make).
4447c609719bSwdenkNote that the cross-powerpc package does not install include files;
4448c609719bSwdenkattempting to build U-Boot will fail because <machine/ansi.h> is
4449c609719bSwdenkmissing.  This file has to be installed and patched manually:
4450c609719bSwdenk
4451c609719bSwdenk	# cd /usr/pkg/cross/powerpc-netbsd/include
4452c609719bSwdenk	# mkdir powerpc
4453c609719bSwdenk	# ln -s powerpc machine
4454c609719bSwdenk	# cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h
4455c609719bSwdenk	# ${EDIT} powerpc/ansi.h	## must remove __va_list, _BSD_VA_LIST
4456c609719bSwdenk
4457c609719bSwdenkNative builds *don't* work due to incompatibilities between native
4458c609719bSwdenkand U-Boot include files.
4459c609719bSwdenk
4460c609719bSwdenkBooting assumes that (the first part of) the image booted is a
4461c609719bSwdenkstage-2 loader which in turn loads and then invokes the kernel
4462c609719bSwdenkproper. Loader sources will eventually appear in the NetBSD source
4463c609719bSwdenktree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the
44642a8af187Swdenkmeantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz
4465c609719bSwdenk
4466c609719bSwdenk
4467c609719bSwdenkImplementation Internals:
4468c609719bSwdenk=========================
4469c609719bSwdenk
4470c609719bSwdenkThe following is not intended to be a complete description of every
4471c609719bSwdenkimplementation detail. However, it should help to understand the
4472c609719bSwdenkinner workings of U-Boot and make it easier to port it to custom
4473c609719bSwdenkhardware.
4474c609719bSwdenk
4475c609719bSwdenk
4476c609719bSwdenkInitial Stack, Global Data:
4477c609719bSwdenk---------------------------
4478c609719bSwdenk
4479c609719bSwdenkThe implementation of U-Boot is complicated by the fact that U-Boot
4480c609719bSwdenkstarts running out of ROM (flash memory), usually without access to
4481c609719bSwdenksystem RAM (because the memory controller is not initialized yet).
4482c609719bSwdenkThis means that we don't have writable Data or BSS segments, and BSS
4483c609719bSwdenkis not initialized as zero. To be able to get a C environment working
4484c609719bSwdenkat all, we have to allocate at least a minimal stack. Implementation
4485c609719bSwdenkoptions for this are defined and restricted by the CPU used: Some CPU
4486c609719bSwdenkmodels provide on-chip memory (like the IMMR area on MPC8xx and
4487c609719bSwdenkMPC826x processors), on others (parts of) the data cache can be
4488c609719bSwdenklocked as (mis-) used as memory, etc.
4489c609719bSwdenk
44907152b1d0Swdenk	Chris Hallinan posted a good summary of these issues to the
44910668236bSWolfgang Denk	U-Boot mailing list:
449243d9616cSwdenk
449343d9616cSwdenk	Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)?
449443d9616cSwdenk	From: "Chris Hallinan" <clh@net1plus.com>
449543d9616cSwdenk	Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET)
449643d9616cSwdenk	...
449743d9616cSwdenk
449843d9616cSwdenk	Correct me if I'm wrong, folks, but the way I understand it
449943d9616cSwdenk	is this: Using DCACHE as initial RAM for Stack, etc, does not
450043d9616cSwdenk	require any physical RAM backing up the cache. The cleverness
450143d9616cSwdenk	is that the cache is being used as a temporary supply of
450243d9616cSwdenk	necessary storage before the SDRAM controller is setup. It's
450311ccc33fSMarcel Ziswiler	beyond the scope of this list to explain the details, but you
450443d9616cSwdenk	can see how this works by studying the cache architecture and
450543d9616cSwdenk	operation in the architecture and processor-specific manuals.
450643d9616cSwdenk
450743d9616cSwdenk	OCM is On Chip Memory, which I believe the 405GP has 4K. It
450843d9616cSwdenk	is another option for the system designer to use as an
450911ccc33fSMarcel Ziswiler	initial stack/RAM area prior to SDRAM being available. Either
451043d9616cSwdenk	option should work for you. Using CS 4 should be fine if your
451143d9616cSwdenk	board designers haven't used it for something that would
451243d9616cSwdenk	cause you grief during the initial boot! It is frequently not
451343d9616cSwdenk	used.
451443d9616cSwdenk
45156d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	CONFIG_SYS_INIT_RAM_ADDR should be somewhere that won't interfere
451643d9616cSwdenk	with your processor/board/system design. The default value
451743d9616cSwdenk	you will find in any recent u-boot distribution in
45188a316c9bSStefan Roese	walnut.h should work for you. I'd set it to a value larger
451943d9616cSwdenk	than your SDRAM module. If you have a 64MB SDRAM module, set
452043d9616cSwdenk	it above 400_0000. Just make sure your board has no resources
452143d9616cSwdenk	that are supposed to respond to that address! That code in
452243d9616cSwdenk	start.S has been around a while and should work as is when
452343d9616cSwdenk	you get the config right.
452443d9616cSwdenk
452543d9616cSwdenk	-Chris Hallinan
452643d9616cSwdenk	DS4.COM, Inc.
452743d9616cSwdenk
4528c609719bSwdenkIt is essential to remember this, since it has some impact on the C
4529c609719bSwdenkcode for the initialization procedures:
4530c609719bSwdenk
4531c609719bSwdenk* Initialized global data (data segment) is read-only. Do not attempt
4532c609719bSwdenk  to write it.
4533c609719bSwdenk
453411ccc33fSMarcel Ziswiler* Do not use any uninitialized global data (or implicitely initialized
4535c609719bSwdenk  as zero data - BSS segment) at all - this is undefined, initiali-
45367152b1d0Swdenk  zation is performed later (when relocating to RAM).
4537c609719bSwdenk
4538c609719bSwdenk* Stack space is very limited. Avoid big data buffers or things like
4539c609719bSwdenk  that.
4540c609719bSwdenk
4541c609719bSwdenkHaving only the stack as writable memory limits means we cannot use
4542c609719bSwdenknormal global data to share information beween the code. But it
4543c609719bSwdenkturned out that the implementation of U-Boot can be greatly
4544c609719bSwdenksimplified by making a global data structure (gd_t) available to all
4545c609719bSwdenkfunctions. We could pass a pointer to this data as argument to _all_
4546c609719bSwdenkfunctions, but this would bloat the code. Instead we use a feature of
4547c609719bSwdenkthe GCC compiler (Global Register Variables) to share the data: we
4548c609719bSwdenkplace a pointer (gd) to the global data into a register which we
4549c609719bSwdenkreserve for this purpose.
4550c609719bSwdenk
45517152b1d0SwdenkWhen choosing a register for such a purpose we are restricted by the
4552c609719bSwdenkrelevant  (E)ABI  specifications for the current architecture, and by
4553c609719bSwdenkGCC's implementation.
4554c609719bSwdenk
4555c609719bSwdenkFor PowerPC, the following registers have specific use:
4556c609719bSwdenk	R1:	stack pointer
4557e7670f6cSWolfgang Denk	R2:	reserved for system use
4558c609719bSwdenk	R3-R4:	parameter passing and return values
4559c609719bSwdenk	R5-R10: parameter passing
4560c609719bSwdenk	R13:	small data area pointer
4561c609719bSwdenk	R30:	GOT pointer
4562c609719bSwdenk	R31:	frame pointer
4563c609719bSwdenk
4564e6bee808SJoakim Tjernlund	(U-Boot also uses R12 as internal GOT pointer. r12
4565e6bee808SJoakim Tjernlund	is a volatile register so r12 needs to be reset when
4566e6bee808SJoakim Tjernlund	going back and forth between asm and C)
4567c609719bSwdenk
4568e7670f6cSWolfgang Denk    ==> U-Boot will use R2 to hold a pointer to the global data
4569c609719bSwdenk
4570c609719bSwdenk    Note: on PPC, we could use a static initializer (since the
4571c609719bSwdenk    address of the global data structure is known at compile time),
4572c609719bSwdenk    but it turned out that reserving a register results in somewhat
4573c609719bSwdenk    smaller code - although the code savings are not that big (on
4574c609719bSwdenk    average for all boards 752 bytes for the whole U-Boot image,
4575c609719bSwdenk    624 text + 127 data).
4576c609719bSwdenk
4577c4db335cSRobin GetzOn Blackfin, the normal C ABI (except for P3) is followed as documented here:
45784c58eb55SMike Frysinger	http://docs.blackfin.uclinux.org/doku.php?id=application_binary_interface
45794c58eb55SMike Frysinger
4580c4db335cSRobin Getz    ==> U-Boot will use P3 to hold a pointer to the global data
45814c58eb55SMike Frysinger
4582c609719bSwdenkOn ARM, the following registers are used:
4583c609719bSwdenk
4584c609719bSwdenk	R0:	function argument word/integer result
4585c609719bSwdenk	R1-R3:	function argument word
4586c609719bSwdenk	R9:	GOT pointer
4587c609719bSwdenk	R10:	stack limit (used only if stack checking if enabled)
4588c609719bSwdenk	R11:	argument (frame) pointer
4589c609719bSwdenk	R12:	temporary workspace
4590c609719bSwdenk	R13:	stack pointer
4591c609719bSwdenk	R14:	link register
4592c609719bSwdenk	R15:	program counter
4593c609719bSwdenk
4594c609719bSwdenk    ==> U-Boot will use R8 to hold a pointer to the global data
4595c609719bSwdenk
45960df01fd3SThomas ChouOn Nios II, the ABI is documented here:
45970df01fd3SThomas Chou	http://www.altera.com/literature/hb/nios2/n2cpu_nii51016.pdf
45980df01fd3SThomas Chou
45990df01fd3SThomas Chou    ==> U-Boot will use gp to hold a pointer to the global data
46000df01fd3SThomas Chou
46010df01fd3SThomas Chou    Note: on Nios II, we give "-G0" option to gcc and don't use gp
46020df01fd3SThomas Chou    to access small data sections, so gp is free.
46030df01fd3SThomas Chou
4604afc1ce82SMacpaul LinOn NDS32, the following registers are used:
4605afc1ce82SMacpaul Lin
4606afc1ce82SMacpaul Lin	R0-R1:	argument/return
4607afc1ce82SMacpaul Lin	R2-R5:	argument
4608afc1ce82SMacpaul Lin	R15:	temporary register for assembler
4609afc1ce82SMacpaul Lin	R16:	trampoline register
4610afc1ce82SMacpaul Lin	R28:	frame pointer (FP)
4611afc1ce82SMacpaul Lin	R29:	global pointer (GP)
4612afc1ce82SMacpaul Lin	R30:	link register (LP)
4613afc1ce82SMacpaul Lin	R31:	stack pointer (SP)
4614afc1ce82SMacpaul Lin	PC:	program counter (PC)
4615afc1ce82SMacpaul Lin
4616afc1ce82SMacpaul Lin    ==> U-Boot will use R10 to hold a pointer to the global data
4617afc1ce82SMacpaul Lin
4618d87080b7SWolfgang DenkNOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope,
4619d87080b7SWolfgang Denkor current versions of GCC may "optimize" the code too much.
4620c609719bSwdenk
4621c609719bSwdenkMemory Management:
4622c609719bSwdenk------------------
4623c609719bSwdenk
4624c609719bSwdenkU-Boot runs in system state and uses physical addresses, i.e. the
4625c609719bSwdenkMMU is not used either for address mapping nor for memory protection.
4626c609719bSwdenk
4627c609719bSwdenkThe available memory is mapped to fixed addresses using the memory
4628c609719bSwdenkcontroller. In this process, a contiguous block is formed for each
4629c609719bSwdenkmemory type (Flash, SDRAM, SRAM), even when it consists of several
4630c609719bSwdenkphysical memory banks.
4631c609719bSwdenk
4632c609719bSwdenkU-Boot is installed in the first 128 kB of the first Flash bank (on
4633c609719bSwdenkTQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After
4634c609719bSwdenkbooting and sizing and initializing DRAM, the code relocates itself
4635c609719bSwdenkto the upper end of DRAM. Immediately below the U-Boot code some
46366d0f6bcfSJean-Christophe PLAGNIOL-VILLARDmemory is reserved for use by malloc() [see CONFIG_SYS_MALLOC_LEN
4637c609719bSwdenkconfiguration setting]. Below that, a structure with global Board
4638c609719bSwdenkInfo data is placed, followed by the stack (growing downward).
4639c609719bSwdenk
4640c609719bSwdenkAdditionally, some exception handler code is copied to the low 8 kB
4641c609719bSwdenkof DRAM (0x00000000 ... 0x00001FFF).
4642c609719bSwdenk
4643c609719bSwdenkSo a typical memory configuration with 16 MB of DRAM could look like
4644c609719bSwdenkthis:
4645c609719bSwdenk
4646c609719bSwdenk	0x0000 0000	Exception Vector code
4647c609719bSwdenk	      :
4648c609719bSwdenk	0x0000 1FFF
4649c609719bSwdenk	0x0000 2000	Free for Application Use
4650c609719bSwdenk	      :
4651c609719bSwdenk	      :
4652c609719bSwdenk
4653c609719bSwdenk	      :
4654c609719bSwdenk	      :
4655c609719bSwdenk	0x00FB FF20	Monitor Stack (Growing downward)
4656c609719bSwdenk	0x00FB FFAC	Board Info Data and permanent copy of global data
4657c609719bSwdenk	0x00FC 0000	Malloc Arena
4658c609719bSwdenk	      :
4659c609719bSwdenk	0x00FD FFFF
4660c609719bSwdenk	0x00FE 0000	RAM Copy of Monitor Code
4661c609719bSwdenk	...		eventually: LCD or video framebuffer
4662c609719bSwdenk	...		eventually: pRAM (Protected RAM - unchanged by reset)
4663c609719bSwdenk	0x00FF FFFF	[End of RAM]
4664c609719bSwdenk
4665c609719bSwdenk
4666c609719bSwdenkSystem Initialization:
4667c609719bSwdenk----------------------
4668c609719bSwdenk
4669c609719bSwdenkIn the reset configuration, U-Boot starts at the reset entry point
467011ccc33fSMarcel Ziswiler(on most PowerPC systems at address 0x00000100). Because of the reset
4671c609719bSwdenkconfiguration for CS0# this is a mirror of the onboard Flash memory.
46727152b1d0SwdenkTo be able to re-map memory U-Boot then jumps to its link address.
4673c609719bSwdenkTo be able to implement the initialization code in C, a (small!)
4674c609719bSwdenkinitial stack is set up in the internal Dual Ported RAM (in case CPUs
4675c609719bSwdenkwhich provide such a feature like MPC8xx or MPC8260), or in a locked
4676c609719bSwdenkpart of the data cache. After that, U-Boot initializes the CPU core,
4677c609719bSwdenkthe caches and the SIU.
4678c609719bSwdenk
4679c609719bSwdenkNext, all (potentially) available memory banks are mapped using a
4680c609719bSwdenkpreliminary mapping. For example, we put them on 512 MB boundaries
4681c609719bSwdenk(multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash
4682c609719bSwdenkon 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is
4683c609719bSwdenkprogrammed for SDRAM access. Using the temporary configuration, a
4684c609719bSwdenksimple memory test is run that determines the size of the SDRAM
4685c609719bSwdenkbanks.
4686c609719bSwdenk
4687c609719bSwdenkWhen there is more than one SDRAM bank, and the banks are of
46887152b1d0Swdenkdifferent size, the largest is mapped first. For equal size, the first
4689c609719bSwdenkbank (CS2#) is mapped first. The first mapping is always for address
4690c609719bSwdenk0x00000000, with any additional banks following immediately to create
4691c609719bSwdenkcontiguous memory starting from 0.
4692c609719bSwdenk
4693c609719bSwdenkThen, the monitor installs itself at the upper end of the SDRAM area
4694c609719bSwdenkand allocates memory for use by malloc() and for the global Board
4695c609719bSwdenkInfo data; also, the exception vector code is copied to the low RAM
4696c609719bSwdenkpages, and the final stack is set up.
4697c609719bSwdenk
4698c609719bSwdenkOnly after this relocation will you have a "normal" C environment;
4699c609719bSwdenkuntil that you are restricted in several ways, mostly because you are
4700c609719bSwdenkrunning from ROM, and because the code will have to be relocated to a
4701c609719bSwdenknew address in RAM.
4702c609719bSwdenk
4703c609719bSwdenk
4704c609719bSwdenkU-Boot Porting Guide:
4705c609719bSwdenk----------------------
4706c609719bSwdenk
4707c609719bSwdenk[Based on messages by Jerry Van Baren in the U-Boot-Users mailing
47086aff3115Swdenklist, October 2002]
4709c609719bSwdenk
4710c609719bSwdenk
4711c609719bSwdenkint main(int argc, char *argv[])
4712c609719bSwdenk{
4713c609719bSwdenk	sighandler_t no_more_time;
4714c609719bSwdenk
4715c609719bSwdenk	signal(SIGALRM, no_more_time);
4716c609719bSwdenk	alarm(PROJECT_DEADLINE - toSec (3 * WEEK));
4717c609719bSwdenk
4718c609719bSwdenk	if (available_money > available_manpower) {
47196c3fef28SJerry Van Baren		Pay consultant to port U-Boot;
4720c609719bSwdenk		return 0;
4721c609719bSwdenk	}
4722c609719bSwdenk
4723c609719bSwdenk	Download latest U-Boot source;
4724c609719bSwdenk
47250668236bSWolfgang Denk	Subscribe to u-boot mailing list;
47266aff3115Swdenk
47276c3fef28SJerry Van Baren	if (clueless)
4728c609719bSwdenk		email("Hi, I am new to U-Boot, how do I get started?");
4729c609719bSwdenk
4730c609719bSwdenk	while (learning) {
4731c609719bSwdenk		Read the README file in the top level directory;
47327cb22f97Swdenk		Read http://www.denx.de/twiki/bin/view/DULG/Manual;
47336c3fef28SJerry Van Baren		Read applicable doc/*.README;
4734c609719bSwdenk		Read the source, Luke;
47356c3fef28SJerry Van Baren		/* find . -name "*.[chS]" | xargs grep -i <keyword> */
4736c609719bSwdenk	}
4737c609719bSwdenk
47386c3fef28SJerry Van Baren	if (available_money > toLocalCurrency ($2500))
47396c3fef28SJerry Van Baren		Buy a BDI3000;
47406c3fef28SJerry Van Baren	else
4741c609719bSwdenk		Add a lot of aggravation and time;
4742c609719bSwdenk
47436c3fef28SJerry Van Baren	if (a similar board exists) {	/* hopefully... */
47446c3fef28SJerry Van Baren		cp -a board/<similar> board/<myboard>
47456c3fef28SJerry Van Baren		cp include/configs/<similar>.h include/configs/<myboard>.h
47466c3fef28SJerry Van Baren	} else {
4747c609719bSwdenk		Create your own board support subdirectory;
47486c3fef28SJerry Van Baren		Create your own board include/configs/<myboard>.h file;
47496c3fef28SJerry Van Baren	}
47506c3fef28SJerry Van Baren	Edit new board/<myboard> files
47516c3fef28SJerry Van Baren	Edit new include/configs/<myboard>.h
4752c609719bSwdenk
47536c3fef28SJerry Van Baren	while (!accepted) {
4754c609719bSwdenk		while (!running) {
4755c609719bSwdenk			do {
4756c609719bSwdenk				Add / modify source code;
4757c609719bSwdenk			} until (compiles);
4758c609719bSwdenk			Debug;
4759c609719bSwdenk			if (clueless)
4760c609719bSwdenk				email("Hi, I am having problems...");
4761c609719bSwdenk		}
47626c3fef28SJerry Van Baren		Send patch file to the U-Boot email list;
47636c3fef28SJerry Van Baren		if (reasonable critiques)
47646c3fef28SJerry Van Baren			Incorporate improvements from email list code review;
47656c3fef28SJerry Van Baren		else
47666c3fef28SJerry Van Baren			Defend code as written;
47676c3fef28SJerry Van Baren	}
4768c609719bSwdenk
4769c609719bSwdenk	return 0;
4770c609719bSwdenk}
4771c609719bSwdenk
4772c609719bSwdenkvoid no_more_time (int sig)
4773c609719bSwdenk{
4774c609719bSwdenk      hire_a_guru();
4775c609719bSwdenk}
4776c609719bSwdenk
4777c609719bSwdenk
4778c609719bSwdenkCoding Standards:
4779c609719bSwdenk-----------------
4780c609719bSwdenk
4781c609719bSwdenkAll contributions to U-Boot should conform to the Linux kernel
47822c051651SDetlev Zundelcoding style; see the file "Documentation/CodingStyle" and the script
47837ca9296eSWolfgang Denk"scripts/Lindent" in your Linux kernel source directory.
4784c609719bSwdenk
47852c051651SDetlev ZundelSource files originating from a different project (for example the
47862c051651SDetlev ZundelMTD subsystem) are generally exempt from these guidelines and are not
47872c051651SDetlev Zundelreformated to ease subsequent migration to newer versions of those
47882c051651SDetlev Zundelsources.
47892c051651SDetlev Zundel
47902c051651SDetlev ZundelPlease note that U-Boot is implemented in C (and to some small parts in
47912c051651SDetlev ZundelAssembler); no C++ is used, so please do not use C++ style comments (//)
47922c051651SDetlev Zundelin your code.
4793c609719bSwdenk
4794c178d3daSwdenkPlease also stick to the following formatting rules:
4795180d3f74Swdenk- remove any trailing white space
47967ca9296eSWolfgang Denk- use TAB characters for indentation and vertical alignment, not spaces
4797180d3f74Swdenk- make sure NOT to use DOS '\r\n' line feeds
47987ca9296eSWolfgang Denk- do not add more than 2 consecutive empty lines to source files
4799180d3f74Swdenk- do not add trailing empty lines to source files
4800180d3f74Swdenk
4801c609719bSwdenkSubmissions which do not conform to the standards may be returned
4802c609719bSwdenkwith a request to reformat the changes.
4803c609719bSwdenk
4804c609719bSwdenk
4805c609719bSwdenkSubmitting Patches:
4806c609719bSwdenk-------------------
4807c609719bSwdenk
4808c609719bSwdenkSince the number of patches for U-Boot is growing, we need to
4809c609719bSwdenkestablish some rules. Submissions which do not conform to these rules
4810c609719bSwdenkmay be rejected, even when they contain important and valuable stuff.
4811c609719bSwdenk
48120d28f34bSMagnus LiljaPlease see http://www.denx.de/wiki/U-Boot/Patches for details.
4813218ca724SWolfgang Denk
48140668236bSWolfgang DenkPatches shall be sent to the u-boot mailing list <u-boot@lists.denx.de>;
48150668236bSWolfgang Denksee http://lists.denx.de/mailman/listinfo/u-boot
48160668236bSWolfgang Denk
4817c609719bSwdenkWhen you send a patch, please include the following information with
4818c609719bSwdenkit:
4819c609719bSwdenk
4820c609719bSwdenk* For bug fixes: a description of the bug and how your patch fixes
4821c609719bSwdenk  this bug. Please try to include a way of demonstrating that the
4822c609719bSwdenk  patch actually fixes something.
4823c609719bSwdenk
4824c609719bSwdenk* For new features: a description of the feature and your
4825c609719bSwdenk  implementation.
4826c609719bSwdenk
4827c609719bSwdenk* A CHANGELOG entry as plaintext (separate from the patch)
4828c609719bSwdenk
4829c609719bSwdenk* For major contributions, your entry to the CREDITS file
4830c609719bSwdenk
4831c609719bSwdenk* When you add support for a new board, don't forget to add this
48327ca9296eSWolfgang Denk  board to the MAINTAINERS file, too.
4833c609719bSwdenk
4834c609719bSwdenk* If your patch adds new configuration options, don't forget to
4835c609719bSwdenk  document these in the README file.
4836c609719bSwdenk
4837218ca724SWolfgang Denk* The patch itself. If you are using git (which is *strongly*
4838218ca724SWolfgang Denk  recommended) you can easily generate the patch using the
48397ca9296eSWolfgang Denk  "git format-patch". If you then use "git send-email" to send it to
4840218ca724SWolfgang Denk  the U-Boot mailing list, you will avoid most of the common problems
4841218ca724SWolfgang Denk  with some other mail clients.
4842c609719bSwdenk
4843218ca724SWolfgang Denk  If you cannot use git, use "diff -purN OLD NEW". If your version of
4844218ca724SWolfgang Denk  diff does not support these options, then get the latest version of
4845218ca724SWolfgang Denk  GNU diff.
48466dff5529Swdenk
4847218ca724SWolfgang Denk  The current directory when running this command shall be the parent
4848218ca724SWolfgang Denk  directory of the U-Boot source tree (i. e. please make sure that
4849218ca724SWolfgang Denk  your patch includes sufficient directory information for the
4850218ca724SWolfgang Denk  affected files).
4851218ca724SWolfgang Denk
4852218ca724SWolfgang Denk  We prefer patches as plain text. MIME attachments are discouraged,
4853218ca724SWolfgang Denk  and compressed attachments must not be used.
4854c609719bSwdenk
485552f52c14Swdenk* If one logical set of modifications affects or creates several
485652f52c14Swdenk  files, all these changes shall be submitted in a SINGLE patch file.
485752f52c14Swdenk
485852f52c14Swdenk* Changesets that contain different, unrelated modifications shall be
485952f52c14Swdenk  submitted as SEPARATE patches, one patch per changeset.
486052f52c14Swdenk
486152f52c14Swdenk
4862c609719bSwdenkNotes:
4863c609719bSwdenk
4864c609719bSwdenk* Before sending the patch, run the MAKEALL script on your patched
4865c609719bSwdenk  source tree and make sure that no errors or warnings are reported
4866c609719bSwdenk  for any of the boards.
4867c609719bSwdenk
4868c609719bSwdenk* Keep your modifications to the necessary minimum: A patch
4869c609719bSwdenk  containing several unrelated changes or arbitrary reformats will be
4870c609719bSwdenk  returned with a request to re-formatting / split it.
4871c609719bSwdenk
4872c609719bSwdenk* If you modify existing code, make sure that your new code does not
4873c609719bSwdenk  add to the memory footprint of the code ;-) Small is beautiful!
4874c609719bSwdenk  When adding new features, these should compile conditionally only
4875c609719bSwdenk  (using #ifdef), and the resulting code with the new feature
4876c609719bSwdenk  disabled must not need more memory than the old code without your
4877c609719bSwdenk  modification.
487890dc6704Swdenk
48790668236bSWolfgang Denk* Remember that there is a size limit of 100 kB per message on the
48800668236bSWolfgang Denk  u-boot mailing list. Bigger patches will be moderated. If they are
48810668236bSWolfgang Denk  reasonable and not too big, they will be acknowledged. But patches
48820668236bSWolfgang Denk  bigger than the size limit should be avoided.
4883