xref: /openbmc/u-boot/README (revision 017e1f3f9fc8745cc12bbd924b0cbc4d6ee5dbf8)
1c609719bSwdenk#
2b75190deSWolfgang Denk# (C) Copyright 2000 - 2012
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
423b67d8816SChristian Riesch- ARM options:
424b67d8816SChristian Riesch		CONFIG_SYS_EXCEPTION_VECTORS_HIGH
425b67d8816SChristian Riesch
426b67d8816SChristian Riesch		Select high exception vectors of the ARM core, e.g., do not
427b67d8816SChristian Riesch		clear the V bit of the c1 register of CP15.
428b67d8816SChristian Riesch
4295da627a4Swdenk- Linux Kernel Interface:
430c609719bSwdenk		CONFIG_CLOCKS_IN_MHZ
431c609719bSwdenk
432c609719bSwdenk		U-Boot stores all clock information in Hz
433c609719bSwdenk		internally. For binary compatibility with older Linux
434c609719bSwdenk		kernels (which expect the clocks passed in the
435c609719bSwdenk		bd_info data to be in MHz) the environment variable
436c609719bSwdenk		"clocks_in_mhz" can be defined so that U-Boot
437c609719bSwdenk		converts clock data to MHZ before passing it to the
438c609719bSwdenk		Linux kernel.
439c609719bSwdenk		When CONFIG_CLOCKS_IN_MHZ is defined, a definition of
440c609719bSwdenk		"clocks_in_mhz=1" is automatically included in the
441c609719bSwdenk		default environment.
442c609719bSwdenk
4435da627a4Swdenk		CONFIG_MEMSIZE_IN_BYTES		[relevant for MIPS only]
4445da627a4Swdenk
44511ccc33fSMarcel Ziswiler		When transferring memsize parameter to linux, some versions
4465da627a4Swdenk		expect it to be in bytes, others in MB.
4475da627a4Swdenk		Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes.
4485da627a4Swdenk
449fec6d9eeSGerald Van Baren		CONFIG_OF_LIBFDT
450f57f70aaSWolfgang Denk
451f57f70aaSWolfgang Denk		New kernel versions are expecting firmware settings to be
452213bf8c8SGerald Van Baren		passed using flattened device trees (based on open firmware
453213bf8c8SGerald Van Baren		concepts).
454213bf8c8SGerald Van Baren
455213bf8c8SGerald Van Baren		CONFIG_OF_LIBFDT
456213bf8c8SGerald Van Baren		 * New libfdt-based support
457213bf8c8SGerald Van Baren		 * Adds the "fdt" command
4583bb342fcSKim Phillips		 * The bootm command automatically updates the fdt
459213bf8c8SGerald Van Baren
460b55ae402SMarcel Ziswiler		OF_CPU - The proper name of the cpus node (only required for
461b55ae402SMarcel Ziswiler			MPC512X and MPC5xxx based boards).
462b55ae402SMarcel Ziswiler		OF_SOC - The proper name of the soc node (only required for
463b55ae402SMarcel Ziswiler			MPC512X and MPC5xxx based boards).
464f57f70aaSWolfgang Denk		OF_TBCLK - The timebase frequency.
465c2871f03SKumar Gala		OF_STDOUT_PATH - The path to the console device
466f57f70aaSWolfgang Denk
46711ccc33fSMarcel Ziswiler		boards with QUICC Engines require OF_QE to set UCC MAC
46811ccc33fSMarcel Ziswiler		addresses
4693bb342fcSKim Phillips
4704e253137SKumar Gala		CONFIG_OF_BOARD_SETUP
4714e253137SKumar Gala
4724e253137SKumar Gala		Board code has addition modification that it wants to make
4734e253137SKumar Gala		to the flat device tree before handing it off to the kernel
4746705d81eSwdenk
4750267768eSMatthew McClintock		CONFIG_OF_BOOT_CPU
4760267768eSMatthew McClintock
47711ccc33fSMarcel Ziswiler		This define fills in the correct boot CPU in the boot
4780267768eSMatthew McClintock		param header, the default value is zero if undefined.
4790267768eSMatthew McClintock
4803887c3fbSHeiko Schocher		CONFIG_OF_IDE_FIXUP
4813887c3fbSHeiko Schocher
4823887c3fbSHeiko Schocher		U-Boot can detect if an IDE device is present or not.
4833887c3fbSHeiko Schocher		If not, and this new config option is activated, U-Boot
4843887c3fbSHeiko Schocher		removes the ATA node from the DTS before booting Linux,
4853887c3fbSHeiko Schocher		so the Linux IDE driver does not probe the device and
4863887c3fbSHeiko Schocher		crash. This is needed for buggy hardware (uc101) where
4873887c3fbSHeiko Schocher		no pull down resistor is connected to the signal IDE5V_DD7.
4883887c3fbSHeiko Schocher
4897eb29398SIgor Grinberg		CONFIG_MACH_TYPE	[relevant for ARM only][mandatory]
4907eb29398SIgor Grinberg
4917eb29398SIgor Grinberg		This setting is mandatory for all boards that have only one
4927eb29398SIgor Grinberg		machine type and must be used to specify the machine type
4937eb29398SIgor Grinberg		number as it appears in the ARM machine registry
4947eb29398SIgor Grinberg		(see http://www.arm.linux.org.uk/developer/machines/).
4957eb29398SIgor Grinberg		Only boards that have multiple machine types supported
4967eb29398SIgor Grinberg		in a single configuration file and the machine type is
4977eb29398SIgor Grinberg		runtime discoverable, do not have to use this setting.
4987eb29398SIgor Grinberg
4990b2f4ecaSNiklaus Giger- vxWorks boot parameters:
5000b2f4ecaSNiklaus Giger
5010b2f4ecaSNiklaus Giger		bootvx constructs a valid bootline using the following
5020b2f4ecaSNiklaus Giger		environments variables: bootfile, ipaddr, serverip, hostname.
5030b2f4ecaSNiklaus Giger		It loads the vxWorks image pointed bootfile.
5040b2f4ecaSNiklaus Giger
5050b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_BOOT_DEVICE - The vxworks device name
5060b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_MAC_PTR - Ethernet 6 byte MA -address
5070b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_SERVERNAME - Name of the server
5080b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_BOOT_ADDR - Address of boot parameters
5090b2f4ecaSNiklaus Giger
5100b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_ADD_PARAMS
5110b2f4ecaSNiklaus Giger
5120b2f4ecaSNiklaus Giger		Add it at the end of the bootline. E.g "u=username pw=secret"
5130b2f4ecaSNiklaus Giger
5140b2f4ecaSNiklaus Giger		Note: If a "bootargs" environment is defined, it will overwride
5150b2f4ecaSNiklaus Giger		the defaults discussed just above.
5160b2f4ecaSNiklaus Giger
5172c451f78SAneesh V- Cache Configuration:
5182c451f78SAneesh V		CONFIG_SYS_ICACHE_OFF - Do not enable instruction cache in U-Boot
5192c451f78SAneesh V		CONFIG_SYS_DCACHE_OFF - Do not enable data cache in U-Boot
5202c451f78SAneesh V		CONFIG_SYS_L2CACHE_OFF- Do not enable L2 cache in U-Boot
5212c451f78SAneesh V
52293bc2193SAneesh V- Cache Configuration for ARM:
52393bc2193SAneesh V		CONFIG_SYS_L2_PL310 - Enable support for ARM PL310 L2 cache
52493bc2193SAneesh V				      controller
52593bc2193SAneesh V		CONFIG_SYS_PL310_BASE - Physical base address of PL310
52693bc2193SAneesh V					controller register space
52793bc2193SAneesh V
5286705d81eSwdenk- Serial Ports:
52948d0192fSAndreas Engel		CONFIG_PL010_SERIAL
5306705d81eSwdenk
5316705d81eSwdenk		Define this if you want support for Amba PrimeCell PL010 UARTs.
5326705d81eSwdenk
53348d0192fSAndreas Engel		CONFIG_PL011_SERIAL
5346705d81eSwdenk
5356705d81eSwdenk		Define this if you want support for Amba PrimeCell PL011 UARTs.
5366705d81eSwdenk
5376705d81eSwdenk		CONFIG_PL011_CLOCK
5386705d81eSwdenk
5396705d81eSwdenk		If you have Amba PrimeCell PL011 UARTs, set this variable to
5406705d81eSwdenk		the clock speed of the UARTs.
5416705d81eSwdenk
5426705d81eSwdenk		CONFIG_PL01x_PORTS
5436705d81eSwdenk
5446705d81eSwdenk		If you have Amba PrimeCell PL010 or PL011 UARTs on your board,
5456705d81eSwdenk		define this to a list of base addresses for each (supported)
5466705d81eSwdenk		port. See e.g. include/configs/versatile.h
5476705d81eSwdenk
548910f1ae3SJohn Rigby		CONFIG_PL011_SERIAL_RLCR
549910f1ae3SJohn Rigby
550910f1ae3SJohn Rigby		Some vendor versions of PL011 serial ports (e.g. ST-Ericsson U8500)
551910f1ae3SJohn Rigby		have separate receive and transmit line control registers.  Set
552910f1ae3SJohn Rigby		this variable to initialize the extra register.
553910f1ae3SJohn Rigby
554910f1ae3SJohn Rigby		CONFIG_PL011_SERIAL_FLUSH_ON_INIT
555910f1ae3SJohn Rigby
556910f1ae3SJohn Rigby		On some platforms (e.g. U8500) U-Boot is loaded by a second stage
557910f1ae3SJohn Rigby		boot loader that has already initialized the UART.  Define this
558910f1ae3SJohn Rigby		variable to flush the UART at init time.
559910f1ae3SJohn Rigby
5606705d81eSwdenk
561c609719bSwdenk- Console Interface:
562c609719bSwdenk		Depending on board, define exactly one serial port
563c609719bSwdenk		(like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2,
564c609719bSwdenk		CONFIG_8xx_CONS_SCC1, ...), or switch off the serial
565c609719bSwdenk		console by defining CONFIG_8xx_CONS_NONE
566c609719bSwdenk
567c609719bSwdenk		Note: if CONFIG_8xx_CONS_NONE is defined, the serial
568c609719bSwdenk		port routines must be defined elsewhere
569c609719bSwdenk		(i.e. serial_init(), serial_getc(), ...)
570c609719bSwdenk
571c609719bSwdenk		CONFIG_CFB_CONSOLE
572c609719bSwdenk		Enables console device for a color framebuffer. Needs following
573c53043b7SWolfgang Denk		defines (cf. smiLynxEM, i8042)
574c609719bSwdenk			VIDEO_FB_LITTLE_ENDIAN	graphic memory organisation
575c609719bSwdenk						(default big endian)
576c609719bSwdenk			VIDEO_HW_RECTFILL	graphic chip supports
577c609719bSwdenk						rectangle fill
578c609719bSwdenk						(cf. smiLynxEM)
579c609719bSwdenk			VIDEO_HW_BITBLT		graphic chip supports
580c609719bSwdenk						bit-blit (cf. smiLynxEM)
581c609719bSwdenk			VIDEO_VISIBLE_COLS	visible pixel columns
582c609719bSwdenk						(cols=pitch)
583c609719bSwdenk			VIDEO_VISIBLE_ROWS	visible pixel rows
584c609719bSwdenk			VIDEO_PIXEL_SIZE	bytes per pixel
585c609719bSwdenk			VIDEO_DATA_FORMAT	graphic data format
586c609719bSwdenk						(0-5, cf. cfb_console.c)
587c609719bSwdenk			VIDEO_FB_ADRS		framebuffer address
588c609719bSwdenk			VIDEO_KBD_INIT_FCT	keyboard int fct
589c609719bSwdenk						(i.e. i8042_kbd_init())
590c609719bSwdenk			VIDEO_TSTC_FCT		test char fct
591c609719bSwdenk						(i.e. i8042_tstc)
592c609719bSwdenk			VIDEO_GETC_FCT		get char fct
593c609719bSwdenk						(i.e. i8042_getc)
594c609719bSwdenk			CONFIG_CONSOLE_CURSOR	cursor drawing on/off
595c609719bSwdenk						(requires blink timer
596c609719bSwdenk						cf. i8042.c)
5976d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c)
598c609719bSwdenk			CONFIG_CONSOLE_TIME	display time/date info in
599c609719bSwdenk						upper right corner
600602ad3b3SJon Loeliger						(requires CONFIG_CMD_DATE)
601c609719bSwdenk			CONFIG_VIDEO_LOGO	display Linux logo in
602c609719bSwdenk						upper left corner
603a6c7ad2fSwdenk			CONFIG_VIDEO_BMP_LOGO	use bmp_logo.h instead of
604a6c7ad2fSwdenk						linux_logo.h for logo.
605a6c7ad2fSwdenk						Requires CONFIG_VIDEO_LOGO
606c609719bSwdenk			CONFIG_CONSOLE_EXTRA_INFO
60711ccc33fSMarcel Ziswiler						additional board info beside
608c609719bSwdenk						the logo
609c609719bSwdenk
610c609719bSwdenk		When CONFIG_CFB_CONSOLE is defined, video console is
611c609719bSwdenk		default i/o. Serial console can be forced with
612c609719bSwdenk		environment 'console=serial'.
613c609719bSwdenk
614a3ad8e26Swdenk		When CONFIG_SILENT_CONSOLE is defined, all console
615a3ad8e26Swdenk		messages (by U-Boot and Linux!) can be silenced with
616a3ad8e26Swdenk		the "silent" environment variable. See
617a3ad8e26Swdenk		doc/README.silent for more information.
618a3ad8e26Swdenk
619c609719bSwdenk- Console Baudrate:
620c609719bSwdenk		CONFIG_BAUDRATE - in bps
621c609719bSwdenk		Select one of the baudrates listed in
6226d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BAUDRATE_TABLE, see below.
6236d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BRGCLK_PRESCALE, baudrate prescale
624c609719bSwdenk
625c92fac91SHeiko Schocher- Console Rx buffer length
626c92fac91SHeiko Schocher		With CONFIG_SYS_SMC_RXBUFLEN it is possible to define
627c92fac91SHeiko Schocher		the maximum receive buffer length for the SMC.
6282b3f12c2SHeiko Schocher		This option is actual only for 82xx and 8xx possible.
629c92fac91SHeiko Schocher		If using CONFIG_SYS_SMC_RXBUFLEN also CONFIG_SYS_MAXIDLE
630c92fac91SHeiko Schocher		must be defined, to setup the maximum idle timeout for
631c92fac91SHeiko Schocher		the SMC.
632c92fac91SHeiko Schocher
6339558b48aSGraeme Russ- Pre-Console Buffer:
6349558b48aSGraeme Russ		Prior to the console being initialised (i.e. serial UART
6359558b48aSGraeme Russ		initialised etc) all console output is silently discarded.
6369558b48aSGraeme Russ		Defining CONFIG_PRE_CONSOLE_BUFFER will cause U-Boot to
6379558b48aSGraeme Russ		buffer any console messages prior to the console being
6389558b48aSGraeme Russ		initialised to a buffer of size CONFIG_PRE_CON_BUF_SZ
6399558b48aSGraeme Russ		bytes located at CONFIG_PRE_CON_BUF_ADDR. The buffer is
6409558b48aSGraeme Russ		a circular buffer, so if more than CONFIG_PRE_CON_BUF_SZ
6419558b48aSGraeme Russ		bytes are output before the console is initialised, the
6429558b48aSGraeme Russ		earlier bytes are discarded.
6439558b48aSGraeme Russ
6449558b48aSGraeme Russ		'Sane' compilers will generate smaller code if
6459558b48aSGraeme Russ		CONFIG_PRE_CON_BUF_SZ is a power of 2
6469558b48aSGraeme Russ
647046a37bdSSonny Rao- Safe printf() functions
648046a37bdSSonny Rao		Define CONFIG_SYS_VSNPRINTF to compile in safe versions of
649046a37bdSSonny Rao		the printf() functions. These are defined in
650046a37bdSSonny Rao		include/vsprintf.h and include snprintf(), vsnprintf() and
651046a37bdSSonny Rao		so on. Code size increase is approximately 300-500 bytes.
652046a37bdSSonny Rao		If this option is not given then these functions will
653046a37bdSSonny Rao		silently discard their buffer size argument - this means
654046a37bdSSonny Rao		you are not getting any overflow checking in this case.
655046a37bdSSonny Rao
656c609719bSwdenk- Boot Delay:	CONFIG_BOOTDELAY - in seconds
657c609719bSwdenk		Delay before automatically booting the default image;
658c609719bSwdenk		set to -1 to disable autoboot.
659c609719bSwdenk
660c609719bSwdenk		See doc/README.autoboot for these options that
661c609719bSwdenk		work with CONFIG_BOOTDELAY. None are required.
662c609719bSwdenk		CONFIG_BOOT_RETRY_TIME
663c609719bSwdenk		CONFIG_BOOT_RETRY_MIN
664c609719bSwdenk		CONFIG_AUTOBOOT_KEYED
665c609719bSwdenk		CONFIG_AUTOBOOT_PROMPT
666c609719bSwdenk		CONFIG_AUTOBOOT_DELAY_STR
667c609719bSwdenk		CONFIG_AUTOBOOT_STOP_STR
668c609719bSwdenk		CONFIG_AUTOBOOT_DELAY_STR2
669c609719bSwdenk		CONFIG_AUTOBOOT_STOP_STR2
670c609719bSwdenk		CONFIG_ZERO_BOOTDELAY_CHECK
671c609719bSwdenk		CONFIG_RESET_TO_RETRY
672c609719bSwdenk
673c609719bSwdenk- Autoboot Command:
674c609719bSwdenk		CONFIG_BOOTCOMMAND
675c609719bSwdenk		Only needed when CONFIG_BOOTDELAY is enabled;
676c609719bSwdenk		define a command string that is automatically executed
677c609719bSwdenk		when no character is read on the console interface
678c609719bSwdenk		within "Boot Delay" after reset.
679c609719bSwdenk
680c609719bSwdenk		CONFIG_BOOTARGS
681c609719bSwdenk		This can be used to pass arguments to the bootm
682c609719bSwdenk		command. The value of CONFIG_BOOTARGS goes into the
683c609719bSwdenk		environment value "bootargs".
684c609719bSwdenk
685c609719bSwdenk		CONFIG_RAMBOOT and CONFIG_NFSBOOT
686c609719bSwdenk		The value of these goes into the environment as
687c609719bSwdenk		"ramboot" and "nfsboot" respectively, and can be used
688c609719bSwdenk		as a convenience, when switching between booting from
68911ccc33fSMarcel Ziswiler		RAM and NFS.
690c609719bSwdenk
691c609719bSwdenk- Pre-Boot Commands:
692c609719bSwdenk		CONFIG_PREBOOT
693c609719bSwdenk
694c609719bSwdenk		When this option is #defined, the existence of the
695c609719bSwdenk		environment variable "preboot" will be checked
696c609719bSwdenk		immediately before starting the CONFIG_BOOTDELAY
697c609719bSwdenk		countdown and/or running the auto-boot command resp.
698c609719bSwdenk		entering interactive mode.
699c609719bSwdenk
700c609719bSwdenk		This feature is especially useful when "preboot" is
701c609719bSwdenk		automatically generated or modified. For an example
702c609719bSwdenk		see the LWMON board specific code: here "preboot" is
703c609719bSwdenk		modified when the user holds down a certain
704c609719bSwdenk		combination of keys on the (special) keyboard when
705c609719bSwdenk		booting the systems
706c609719bSwdenk
707c609719bSwdenk- Serial Download Echo Mode:
708c609719bSwdenk		CONFIG_LOADS_ECHO
709c609719bSwdenk		If defined to 1, all characters received during a
710c609719bSwdenk		serial download (using the "loads" command) are
711c609719bSwdenk		echoed back. This might be needed by some terminal
712c609719bSwdenk		emulations (like "cu"), but may as well just take
713c609719bSwdenk		time on others. This setting #define's the initial
714c609719bSwdenk		value of the "loads_echo" environment variable.
715c609719bSwdenk
716602ad3b3SJon Loeliger- Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined)
717c609719bSwdenk		CONFIG_KGDB_BAUDRATE
718c609719bSwdenk		Select one of the baudrates listed in
7196d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BAUDRATE_TABLE, see below.
720c609719bSwdenk
721c609719bSwdenk- Monitor Functions:
722602ad3b3SJon Loeliger		Monitor commands can be included or excluded
723602ad3b3SJon Loeliger		from the build by using the #include files
724602ad3b3SJon Loeliger		"config_cmd_all.h" and #undef'ing unwanted
725602ad3b3SJon Loeliger		commands, or using "config_cmd_default.h"
726602ad3b3SJon Loeliger		and augmenting with additional #define's
727602ad3b3SJon Loeliger		for wanted commands.
728c609719bSwdenk
729602ad3b3SJon Loeliger		The default command configuration includes all commands
730602ad3b3SJon Loeliger		except those marked below with a "*".
731602ad3b3SJon Loeliger
732602ad3b3SJon Loeliger		CONFIG_CMD_ASKENV	* ask for env variable
733602ad3b3SJon Loeliger		CONFIG_CMD_BDI		  bdinfo
734602ad3b3SJon Loeliger		CONFIG_CMD_BEDBUG	* Include BedBug Debugger
735602ad3b3SJon Loeliger		CONFIG_CMD_BMP		* BMP support
736602ad3b3SJon Loeliger		CONFIG_CMD_BSP		* Board specific commands
737602ad3b3SJon Loeliger		CONFIG_CMD_BOOTD	  bootd
738602ad3b3SJon Loeliger		CONFIG_CMD_CACHE	* icache, dcache
739602ad3b3SJon Loeliger		CONFIG_CMD_CONSOLE	  coninfo
740710b9938SMike Frysinger		CONFIG_CMD_CRC32	* crc32
741602ad3b3SJon Loeliger		CONFIG_CMD_DATE		* support for RTC, date/time...
742602ad3b3SJon Loeliger		CONFIG_CMD_DHCP		* DHCP support
743602ad3b3SJon Loeliger		CONFIG_CMD_DIAG		* Diagnostics
744a7c93104SPeter Tyser		CONFIG_CMD_DS4510	* ds4510 I2C gpio commands
745a7c93104SPeter Tyser		CONFIG_CMD_DS4510_INFO	* ds4510 I2C info command
746a7c93104SPeter Tyser		CONFIG_CMD_DS4510_MEM	* ds4510 I2C eeprom/sram commansd
747a7c93104SPeter Tyser		CONFIG_CMD_DS4510_RST	* ds4510 I2C rst command
748602ad3b3SJon Loeliger		CONFIG_CMD_DTT		* Digital Therm and Thermostat
749602ad3b3SJon Loeliger		CONFIG_CMD_ECHO		  echo arguments
750246c6922SPeter Tyser		CONFIG_CMD_EDITENV	  edit env variable
751602ad3b3SJon Loeliger		CONFIG_CMD_EEPROM	* EEPROM read/write support
752602ad3b3SJon Loeliger		CONFIG_CMD_ELF		* bootelf, bootvx
7530c79cda0SMike Frysinger		CONFIG_CMD_EXPORTENV	* export the environment
754bdab39d3SMike Frysinger		CONFIG_CMD_SAVEENV	  saveenv
755602ad3b3SJon Loeliger		CONFIG_CMD_FDC		* Floppy Disk Support
756602ad3b3SJon Loeliger		CONFIG_CMD_FAT		* FAT partition support
757602ad3b3SJon Loeliger		CONFIG_CMD_FDOS		* Dos diskette Support
758602ad3b3SJon Loeliger		CONFIG_CMD_FLASH	  flinfo, erase, protect
759602ad3b3SJon Loeliger		CONFIG_CMD_FPGA		  FPGA device initialization support
760a641b979SMike Frysinger		CONFIG_CMD_GO		* the 'go' command (exec code)
761a000b795SKim Phillips		CONFIG_CMD_GREPENV	* search environment
762602ad3b3SJon Loeliger		CONFIG_CMD_HWFLOW	* RTS/CTS hw flow control
763602ad3b3SJon Loeliger		CONFIG_CMD_I2C		* I2C serial bus support
764602ad3b3SJon Loeliger		CONFIG_CMD_IDE		* IDE harddisk support
765602ad3b3SJon Loeliger		CONFIG_CMD_IMI		  iminfo
766602ad3b3SJon Loeliger		CONFIG_CMD_IMLS		  List all found images
767602ad3b3SJon Loeliger		CONFIG_CMD_IMMAP	* IMMR dump support
7680c79cda0SMike Frysinger		CONFIG_CMD_IMPORTENV	* import an environment
769602ad3b3SJon Loeliger		CONFIG_CMD_IRQ		* irqinfo
770602ad3b3SJon Loeliger		CONFIG_CMD_ITEST	  Integer/string test of 2 values
771602ad3b3SJon Loeliger		CONFIG_CMD_JFFS2	* JFFS2 Support
772602ad3b3SJon Loeliger		CONFIG_CMD_KGDB		* kgdb
7731ba7fd25SMike Frysinger		CONFIG_CMD_LDRINFO	  ldrinfo (display Blackfin loader)
774602ad3b3SJon Loeliger		CONFIG_CMD_LOADB	  loadb
775602ad3b3SJon Loeliger		CONFIG_CMD_LOADS	  loads
77602c9aa1dSRobin Getz		CONFIG_CMD_MD5SUM	  print md5 message digest
77702c9aa1dSRobin Getz					  (requires CONFIG_CMD_MEMORY and CONFIG_MD5)
778602ad3b3SJon Loeliger		CONFIG_CMD_MEMORY	  md, mm, nm, mw, cp, cmp, crc, base,
77956523f12Swdenk					  loop, loopw, mtest
780602ad3b3SJon Loeliger		CONFIG_CMD_MISC		  Misc functions like sleep etc
781602ad3b3SJon Loeliger		CONFIG_CMD_MMC		* MMC memory mapped support
782602ad3b3SJon Loeliger		CONFIG_CMD_MII		* MII utility commands
78368d7d651SStefan Roese		CONFIG_CMD_MTDPARTS	* MTD partition support
784602ad3b3SJon Loeliger		CONFIG_CMD_NAND		* NAND support
785602ad3b3SJon Loeliger		CONFIG_CMD_NET		  bootp, tftpboot, rarpboot
786e92739d3SPeter Tyser		CONFIG_CMD_PCA953X	* PCA953x I2C gpio commands
787e92739d3SPeter Tyser		CONFIG_CMD_PCA953X_INFO * PCA953x I2C gpio info command
788602ad3b3SJon Loeliger		CONFIG_CMD_PCI		* pciinfo
789602ad3b3SJon Loeliger		CONFIG_CMD_PCMCIA		* PCMCIA support
790602ad3b3SJon Loeliger		CONFIG_CMD_PING		* send ICMP ECHO_REQUEST to network
791602ad3b3SJon Loeliger					  host
792602ad3b3SJon Loeliger		CONFIG_CMD_PORTIO	* Port I/O
793602ad3b3SJon Loeliger		CONFIG_CMD_REGINFO	* Register dump
794602ad3b3SJon Loeliger		CONFIG_CMD_RUN		  run command in env variable
795602ad3b3SJon Loeliger		CONFIG_CMD_SAVES	* save S record dump
796602ad3b3SJon Loeliger		CONFIG_CMD_SCSI		* SCSI Support
797602ad3b3SJon Loeliger		CONFIG_CMD_SDRAM	* print SDRAM configuration information
798602ad3b3SJon Loeliger					  (requires CONFIG_CMD_I2C)
799602ad3b3SJon Loeliger		CONFIG_CMD_SETGETDCR	  Support for DCR Register access
800602ad3b3SJon Loeliger					  (4xx only)
801f61ec45eSEric Nelson		CONFIG_CMD_SF		* Read/write/erase SPI NOR flash
802c6b1ee66SAlexander Holler		CONFIG_CMD_SHA1SUM	  print sha1 memory digest
80302c9aa1dSRobin Getz					  (requires CONFIG_CMD_MEMORY)
80474de7aefSWolfgang Denk		CONFIG_CMD_SOURCE	  "source" command Support
805602ad3b3SJon Loeliger		CONFIG_CMD_SPI		* SPI serial bus support
8067a83af07SLuca Ceresoli		CONFIG_CMD_TFTPSRV	* TFTP transfer in server mode
8071fb7cd49SSimon Glass		CONFIG_CMD_TFTPPUT	* TFTP put command (upload)
808ca366d0eSChe-liang Chiou		CONFIG_CMD_TIME		* run command and report execution time
809602ad3b3SJon Loeliger		CONFIG_CMD_USB		* USB support
810602ad3b3SJon Loeliger		CONFIG_CMD_CDP		* Cisco Discover Protocol support
811602ad3b3SJon Loeliger		CONFIG_CMD_FSL		* Microblaze FSL support
812c609719bSwdenk
813c609719bSwdenk
814c609719bSwdenk		EXAMPLE: If you want all functions except of network
815c609719bSwdenk		support you can write:
816c609719bSwdenk
817602ad3b3SJon Loeliger		#include "config_cmd_all.h"
818602ad3b3SJon Loeliger		#undef CONFIG_CMD_NET
819c609719bSwdenk
820213bf8c8SGerald Van Baren	Other Commands:
821213bf8c8SGerald Van Baren		fdt (flattened device tree) command: CONFIG_OF_LIBFDT
822c609719bSwdenk
823c609719bSwdenk	Note:	Don't enable the "icache" and "dcache" commands
824602ad3b3SJon Loeliger		(configuration option CONFIG_CMD_CACHE) unless you know
825c609719bSwdenk		what you (and your U-Boot users) are doing. Data
826c609719bSwdenk		cache cannot be enabled on systems like the 8xx or
827c609719bSwdenk		8260 (where accesses to the IMMR region must be
828c609719bSwdenk		uncached), and it cannot be disabled on all other
829c609719bSwdenk		systems where we (mis-) use the data cache to hold an
830c609719bSwdenk		initial stack and some data.
831c609719bSwdenk
832c609719bSwdenk
833c609719bSwdenk		XXX - this list needs to get updated!
834c609719bSwdenk
83545ba8077SSimon Glass- Device tree:
83645ba8077SSimon Glass		CONFIG_OF_CONTROL
83745ba8077SSimon Glass		If this variable is defined, U-Boot will use a device tree
83845ba8077SSimon Glass		to configure its devices, instead of relying on statically
83945ba8077SSimon Glass		compiled #defines in the board file. This option is
84045ba8077SSimon Glass		experimental and only available on a few boards. The device
84145ba8077SSimon Glass		tree is available in the global data as gd->fdt_blob.
84245ba8077SSimon Glass
8432c0f79e4SSimon Glass		U-Boot needs to get its device tree from somewhere. This can
8442c0f79e4SSimon Glass		be done using one of the two options below:
845bbb0b128SSimon Glass
846bbb0b128SSimon Glass		CONFIG_OF_EMBED
847bbb0b128SSimon Glass		If this variable is defined, U-Boot will embed a device tree
848bbb0b128SSimon Glass		binary in its image. This device tree file should be in the
849bbb0b128SSimon Glass		board directory and called <soc>-<board>.dts. The binary file
850bbb0b128SSimon Glass		is then picked up in board_init_f() and made available through
851bbb0b128SSimon Glass		the global data structure as gd->blob.
85245ba8077SSimon Glass
8532c0f79e4SSimon Glass		CONFIG_OF_SEPARATE
8542c0f79e4SSimon Glass		If this variable is defined, U-Boot will build a device tree
8552c0f79e4SSimon Glass		binary. It will be called u-boot.dtb. Architecture-specific
8562c0f79e4SSimon Glass		code will locate it at run-time. Generally this works by:
8572c0f79e4SSimon Glass
8582c0f79e4SSimon Glass			cat u-boot.bin u-boot.dtb >image.bin
8592c0f79e4SSimon Glass
8602c0f79e4SSimon Glass		and in fact, U-Boot does this for you, creating a file called
8612c0f79e4SSimon Glass		u-boot-dtb.bin which is useful in the common case. You can
8622c0f79e4SSimon Glass		still use the individual files if you need something more
8632c0f79e4SSimon Glass		exotic.
8642c0f79e4SSimon Glass
865c609719bSwdenk- Watchdog:
866c609719bSwdenk		CONFIG_WATCHDOG
867c609719bSwdenk		If this variable is defined, it enables watchdog
8686abe6fb6SDetlev Zundel		support for the SoC. There must be support in the SoC
8696abe6fb6SDetlev Zundel		specific code for a watchdog. For the 8xx and 8260
8706abe6fb6SDetlev Zundel		CPUs, the SIU Watchdog feature is enabled in the SYPCR
8716abe6fb6SDetlev Zundel		register.  When supported for a specific SoC is
8726abe6fb6SDetlev Zundel		available, then no further board specific code should
8736abe6fb6SDetlev Zundel		be needed to use it.
8746abe6fb6SDetlev Zundel
8756abe6fb6SDetlev Zundel		CONFIG_HW_WATCHDOG
8766abe6fb6SDetlev Zundel		When using a watchdog circuitry external to the used
8776abe6fb6SDetlev Zundel		SoC, then define this variable and provide board
8786abe6fb6SDetlev Zundel		specific code for the "hw_watchdog_reset" function.
879c609719bSwdenk
880c1551ea8Sstroese- U-Boot Version:
881c1551ea8Sstroese		CONFIG_VERSION_VARIABLE
882c1551ea8Sstroese		If this variable is defined, an environment variable
883c1551ea8Sstroese		named "ver" is created by U-Boot showing the U-Boot
884c1551ea8Sstroese		version as printed by the "version" command.
885c1551ea8Sstroese		This variable is readonly.
886c1551ea8Sstroese
887c609719bSwdenk- Real-Time Clock:
888c609719bSwdenk
889602ad3b3SJon Loeliger		When CONFIG_CMD_DATE is selected, the type of the RTC
890c609719bSwdenk		has to be selected, too. Define exactly one of the
891c609719bSwdenk		following options:
892c609719bSwdenk
893c609719bSwdenk		CONFIG_RTC_MPC8xx	- use internal RTC of MPC8xx
894c609719bSwdenk		CONFIG_RTC_PCF8563	- use Philips PCF8563 RTC
8954e8b7544SFabio Estevam		CONFIG_RTC_MC13XXX	- use MC13783 or MC13892 RTC
896c609719bSwdenk		CONFIG_RTC_MC146818	- use MC146818 RTC
8971cb8e980Swdenk		CONFIG_RTC_DS1307	- use Maxim, Inc. DS1307 RTC
898c609719bSwdenk		CONFIG_RTC_DS1337	- use Maxim, Inc. DS1337 RTC
8997f70e853Swdenk		CONFIG_RTC_DS1338	- use Maxim, Inc. DS1338 RTC
9003bac3513Swdenk		CONFIG_RTC_DS164x	- use Dallas DS164x RTC
9019536dfccSTor Krill		CONFIG_RTC_ISL1208	- use Intersil ISL1208 RTC
9024c0d4c3bSwdenk		CONFIG_RTC_MAX6900	- use Maxim, Inc. MAX6900 RTC
9036d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_RTC_DS1337_NOOSC	- Turn off the OSC output for DS1337
90471d19f30SHeiko Schocher		CONFIG_SYS_RV3029_TCR	- enable trickle charger on
90571d19f30SHeiko Schocher					  RV3029 RTC.
906c609719bSwdenk
907b37c7e5eSwdenk		Note that if the RTC uses I2C, then the I2C interface
908b37c7e5eSwdenk		must also be configured. See I2C Support, below.
909b37c7e5eSwdenk
910e92739d3SPeter Tyser- GPIO Support:
911e92739d3SPeter Tyser		CONFIG_PCA953X		- use NXP's PCA953X series I2C GPIO
912e92739d3SPeter Tyser		CONFIG_PCA953X_INFO	- enable pca953x info command
913e92739d3SPeter Tyser
9145dec49caSChris Packham		The CONFIG_SYS_I2C_PCA953X_WIDTH option specifies a list of
9155dec49caSChris Packham		chip-ngpio pairs that tell the PCA953X driver the number of
9165dec49caSChris Packham		pins supported by a particular chip.
9175dec49caSChris Packham
918e92739d3SPeter Tyser		Note that if the GPIO device uses I2C, then the I2C interface
919e92739d3SPeter Tyser		must also be configured. See I2C Support, below.
920e92739d3SPeter Tyser
921c609719bSwdenk- Timestamp Support:
922c609719bSwdenk
923c609719bSwdenk		When CONFIG_TIMESTAMP is selected, the timestamp
924c609719bSwdenk		(date and time) of an image is printed by image
925c609719bSwdenk		commands like bootm or iminfo. This option is
926602ad3b3SJon Loeliger		automatically enabled when you select CONFIG_CMD_DATE .
927c609719bSwdenk
928c609719bSwdenk- Partition Support:
929c609719bSwdenk		CONFIG_MAC_PARTITION and/or CONFIG_DOS_PARTITION
93007f3d789Srichardretanubun		and/or CONFIG_ISO_PARTITION and/or CONFIG_EFI_PARTITION
931c609719bSwdenk
932602ad3b3SJon Loeliger		If IDE or SCSI support is enabled (CONFIG_CMD_IDE or
933218ca724SWolfgang Denk		CONFIG_CMD_SCSI) you must configure support for at
934218ca724SWolfgang Denk		least one partition type as well.
935c609719bSwdenk
936c609719bSwdenk- IDE Reset method:
9374d13cbadSwdenk		CONFIG_IDE_RESET_ROUTINE - this is defined in several
9384d13cbadSwdenk		board configurations files but used nowhere!
939c609719bSwdenk
9404d13cbadSwdenk		CONFIG_IDE_RESET - is this is defined, IDE Reset will
9414d13cbadSwdenk		be performed by calling the function
9424d13cbadSwdenk			ide_set_reset(int reset)
9434d13cbadSwdenk		which has to be defined in a board specific file
944c609719bSwdenk
945c609719bSwdenk- ATAPI Support:
946c609719bSwdenk		CONFIG_ATAPI
947c609719bSwdenk
948c609719bSwdenk		Set this to enable ATAPI support.
949c609719bSwdenk
950c40b2956Swdenk- LBA48 Support
951c40b2956Swdenk		CONFIG_LBA48
952c40b2956Swdenk
953c40b2956Swdenk		Set this to enable support for disks larger than 137GB
9544b142febSHeiko Schocher		Also look at CONFIG_SYS_64BIT_LBA.
955c40b2956Swdenk		Whithout these , LBA48 support uses 32bit variables and will 'only'
956c40b2956Swdenk		support disks up to 2.1TB.
957c40b2956Swdenk
9586d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_64BIT_LBA:
959c40b2956Swdenk			When enabled, makes the IDE subsystem use 64bit sector addresses.
960c40b2956Swdenk			Default is 32bit.
961c40b2956Swdenk
962c609719bSwdenk- SCSI Support:
963c609719bSwdenk		At the moment only there is only support for the
964c609719bSwdenk		SYM53C8XX SCSI controller; define
965c609719bSwdenk		CONFIG_SCSI_SYM53C8XX to enable it.
966c609719bSwdenk
9676d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_LUN [8], CONFIG_SYS_SCSI_MAX_SCSI_ID [7] and
9686d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_DEVICE [CONFIG_SYS_SCSI_MAX_SCSI_ID *
9696d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_LUN] can be adjusted to define the
970c609719bSwdenk		maximum numbers of LUNs, SCSI ID's and target
971c609719bSwdenk		devices.
9726d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz)
973c609719bSwdenk
974c609719bSwdenk- NETWORK Support (PCI):
975682011ffSwdenk		CONFIG_E1000
976ce5207e1SKyle Moffett		Support for Intel 8254x/8257x gigabit chips.
977ce5207e1SKyle Moffett
978ce5207e1SKyle Moffett		CONFIG_E1000_SPI
979ce5207e1SKyle Moffett		Utility code for direct access to the SPI bus on Intel 8257x.
980ce5207e1SKyle Moffett		This does not do anything useful unless you set at least one
981ce5207e1SKyle Moffett		of CONFIG_CMD_E1000 or CONFIG_E1000_SPI_GENERIC.
982ce5207e1SKyle Moffett
983ce5207e1SKyle Moffett		CONFIG_E1000_SPI_GENERIC
984ce5207e1SKyle Moffett		Allow generic access to the SPI bus on the Intel 8257x, for
985ce5207e1SKyle Moffett		example with the "sspi" command.
986ce5207e1SKyle Moffett
987ce5207e1SKyle Moffett		CONFIG_CMD_E1000
988ce5207e1SKyle Moffett		Management command for E1000 devices.  When used on devices
989ce5207e1SKyle Moffett		with SPI support you can reprogram the EEPROM from U-Boot.
990682011ffSwdenk
991ac3315c2SAndre Schwarz		CONFIG_E1000_FALLBACK_MAC
99211ccc33fSMarcel Ziswiler		default MAC for empty EEPROM after production.
993ac3315c2SAndre Schwarz
994c609719bSwdenk		CONFIG_EEPRO100
995c609719bSwdenk		Support for Intel 82557/82559/82559ER chips.
99611ccc33fSMarcel Ziswiler		Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM
997c609719bSwdenk		write routine for first time initialisation.
998c609719bSwdenk
999c609719bSwdenk		CONFIG_TULIP
1000c609719bSwdenk		Support for Digital 2114x chips.
1001c609719bSwdenk		Optional CONFIG_TULIP_SELECT_MEDIA for board specific
1002c609719bSwdenk		modem chip initialisation (KS8761/QS6611).
1003c609719bSwdenk
1004c609719bSwdenk		CONFIG_NATSEMI
1005c609719bSwdenk		Support for National dp83815 chips.
1006c609719bSwdenk
1007c609719bSwdenk		CONFIG_NS8382X
1008c609719bSwdenk		Support for National dp8382[01] gigabit chips.
1009c609719bSwdenk
101045219c46Swdenk- NETWORK Support (other):
101145219c46Swdenk
1012c041e9d2SJens Scharsig		CONFIG_DRIVER_AT91EMAC
1013c041e9d2SJens Scharsig		Support for AT91RM9200 EMAC.
1014c041e9d2SJens Scharsig
1015c041e9d2SJens Scharsig			CONFIG_RMII
1016c041e9d2SJens Scharsig			Define this to use reduced MII inteface
1017c041e9d2SJens Scharsig
1018c041e9d2SJens Scharsig			CONFIG_DRIVER_AT91EMAC_QUIET
1019c041e9d2SJens Scharsig			If this defined, the driver is quiet.
1020c041e9d2SJens Scharsig			The driver doen't show link status messages.
1021c041e9d2SJens Scharsig
1022efdd7319SRob Herring		CONFIG_CALXEDA_XGMAC
1023efdd7319SRob Herring		Support for the Calxeda XGMAC device
1024efdd7319SRob Herring
102545219c46Swdenk		CONFIG_DRIVER_LAN91C96
102645219c46Swdenk		Support for SMSC's LAN91C96 chips.
102745219c46Swdenk
102845219c46Swdenk			CONFIG_LAN91C96_BASE
102945219c46Swdenk			Define this to hold the physical address
103045219c46Swdenk			of the LAN91C96's I/O space
103145219c46Swdenk
103245219c46Swdenk			CONFIG_LAN91C96_USE_32_BIT
103345219c46Swdenk			Define this to enable 32 bit addressing
103445219c46Swdenk
1035f39748aeSwdenk		CONFIG_DRIVER_SMC91111
1036f39748aeSwdenk		Support for SMSC's LAN91C111 chip
1037f39748aeSwdenk
1038f39748aeSwdenk			CONFIG_SMC91111_BASE
1039f39748aeSwdenk			Define this to hold the physical address
1040f39748aeSwdenk			of the device (I/O space)
1041f39748aeSwdenk
1042f39748aeSwdenk			CONFIG_SMC_USE_32_BIT
1043f39748aeSwdenk			Define this if data bus is 32 bits
1044f39748aeSwdenk
1045f39748aeSwdenk			CONFIG_SMC_USE_IOFUNCS
1046f39748aeSwdenk			Define this to use i/o functions instead of macros
1047f39748aeSwdenk			(some hardware wont work with macros)
1048f39748aeSwdenk
1049dc02badaSHeiko Schocher		CONFIG_DRIVER_TI_EMAC
1050dc02badaSHeiko Schocher		Support for davinci emac
1051dc02badaSHeiko Schocher
1052dc02badaSHeiko Schocher			CONFIG_SYS_DAVINCI_EMAC_PHY_COUNT
1053dc02badaSHeiko Schocher			Define this if you have more then 3 PHYs.
1054dc02badaSHeiko Schocher
1055b3dbf4a5SMacpaul Lin		CONFIG_FTGMAC100
1056b3dbf4a5SMacpaul Lin		Support for Faraday's FTGMAC100 Gigabit SoC Ethernet
1057b3dbf4a5SMacpaul Lin
1058b3dbf4a5SMacpaul Lin			CONFIG_FTGMAC100_EGIGA
1059b3dbf4a5SMacpaul Lin			Define this to use GE link update with gigabit PHY.
1060b3dbf4a5SMacpaul Lin			Define this if FTGMAC100 is connected to gigabit PHY.
1061b3dbf4a5SMacpaul Lin			If your system has 10/100 PHY only, it might not occur
1062b3dbf4a5SMacpaul Lin			wrong behavior. Because PHY usually return timeout or
1063b3dbf4a5SMacpaul Lin			useless data when polling gigabit status and gigabit
1064b3dbf4a5SMacpaul Lin			control registers. This behavior won't affect the
1065b3dbf4a5SMacpaul Lin			correctnessof 10/100 link speed update.
1066b3dbf4a5SMacpaul Lin
1067c2fff331SMike Rapoport		CONFIG_SMC911X
1068557b377dSJens Gehrlein		Support for SMSC's LAN911x and LAN921x chips
1069557b377dSJens Gehrlein
1070c2fff331SMike Rapoport			CONFIG_SMC911X_BASE
1071557b377dSJens Gehrlein			Define this to hold the physical address
1072557b377dSJens Gehrlein			of the device (I/O space)
1073557b377dSJens Gehrlein
1074c2fff331SMike Rapoport			CONFIG_SMC911X_32_BIT
1075557b377dSJens Gehrlein			Define this if data bus is 32 bits
1076557b377dSJens Gehrlein
1077c2fff331SMike Rapoport			CONFIG_SMC911X_16_BIT
1078557b377dSJens Gehrlein			Define this if data bus is 16 bits. If your processor
1079557b377dSJens Gehrlein			automatically converts one 32 bit word to two 16 bit
1080c2fff331SMike Rapoport			words you may also try CONFIG_SMC911X_32_BIT.
1081557b377dSJens Gehrlein
10823d0075faSYoshihiro Shimoda		CONFIG_SH_ETHER
10833d0075faSYoshihiro Shimoda		Support for Renesas on-chip Ethernet controller
10843d0075faSYoshihiro Shimoda
10853d0075faSYoshihiro Shimoda			CONFIG_SH_ETHER_USE_PORT
10863d0075faSYoshihiro Shimoda			Define the number of ports to be used
10873d0075faSYoshihiro Shimoda
10883d0075faSYoshihiro Shimoda			CONFIG_SH_ETHER_PHY_ADDR
10893d0075faSYoshihiro Shimoda			Define the ETH PHY's address
10903d0075faSYoshihiro Shimoda
109168260aabSYoshihiro Shimoda			CONFIG_SH_ETHER_CACHE_WRITEBACK
109268260aabSYoshihiro Shimoda			If this option is set, the driver enables cache flush.
109368260aabSYoshihiro Shimoda
10945e124724SVadim Bendebury- TPM Support:
10955e124724SVadim Bendebury		CONFIG_GENERIC_LPC_TPM
10965e124724SVadim Bendebury		Support for generic parallel port TPM devices. Only one device
10975e124724SVadim Bendebury		per system is supported at this time.
10985e124724SVadim Bendebury
10995e124724SVadim Bendebury			CONFIG_TPM_TIS_BASE_ADDRESS
11005e124724SVadim Bendebury			Base address where the generic TPM device is mapped
11015e124724SVadim Bendebury			to. Contemporary x86 systems usually map it at
11025e124724SVadim Bendebury			0xfed40000.
11035e124724SVadim Bendebury
1104c609719bSwdenk- USB Support:
1105c609719bSwdenk		At the moment only the UHCI host controller is
11064d13cbadSwdenk		supported (PIP405, MIP405, MPC5200); define
1107c609719bSwdenk		CONFIG_USB_UHCI to enable it.
1108c609719bSwdenk		define CONFIG_USB_KEYBOARD to enable the USB Keyboard
110930d56faeSwdenk		and define CONFIG_USB_STORAGE to enable the USB
1110c609719bSwdenk		storage devices.
1111c609719bSwdenk		Note:
1112c609719bSwdenk		Supported are USB Keyboards and USB Floppy drives
1113c609719bSwdenk		(TEAC FD-05PUB).
11144d13cbadSwdenk		MPC5200 USB requires additional defines:
11154d13cbadSwdenk			CONFIG_USB_CLOCK
11164d13cbadSwdenk				for 528 MHz Clock: 0x0001bbbb
1117307ecb6dSEric Millbrandt			CONFIG_PSC3_USB
1118307ecb6dSEric Millbrandt				for USB on PSC3
11194d13cbadSwdenk			CONFIG_USB_CONFIG
11204d13cbadSwdenk				for differential drivers: 0x00001000
11214d13cbadSwdenk				for single ended drivers: 0x00005000
1122307ecb6dSEric Millbrandt				for differential drivers on PSC3: 0x00000100
1123307ecb6dSEric Millbrandt				for single ended drivers on PSC3: 0x00004100
11246d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_USB_EVENT_POLL
1125fdcfaa1bSZhang Wei				May be defined to allow interrupt polling
1126fdcfaa1bSZhang Wei				instead of using asynchronous interrupts
11274d13cbadSwdenk
11289ab4ce22SSimon Glass		CONFIG_USB_EHCI_TXFIFO_THRESH enables setting of the
11299ab4ce22SSimon Glass		txfilltuning field in the EHCI controller on reset.
11309ab4ce22SSimon Glass
113116c8d5e7SWolfgang Denk- USB Device:
113216c8d5e7SWolfgang Denk		Define the below if you wish to use the USB console.
113316c8d5e7SWolfgang Denk		Once firmware is rebuilt from a serial console issue the
113416c8d5e7SWolfgang Denk		command "setenv stdin usbtty; setenv stdout usbtty" and
113511ccc33fSMarcel Ziswiler		attach your USB cable. The Unix command "dmesg" should print
113616c8d5e7SWolfgang Denk		it has found a new device. The environment variable usbtty
113716c8d5e7SWolfgang Denk		can be set to gserial or cdc_acm to enable your device to
113816c8d5e7SWolfgang Denk		appear to a USB host as a Linux gserial device or a
113916c8d5e7SWolfgang Denk		Common Device Class Abstract Control Model serial device.
114016c8d5e7SWolfgang Denk		If you select usbtty = gserial you should be able to enumerate
114116c8d5e7SWolfgang Denk		a Linux host by
114216c8d5e7SWolfgang Denk		# modprobe usbserial vendor=0xVendorID product=0xProductID
114316c8d5e7SWolfgang Denk		else if using cdc_acm, simply setting the environment
114416c8d5e7SWolfgang Denk		variable usbtty to be cdc_acm should suffice. The following
114516c8d5e7SWolfgang Denk		might be defined in YourBoardName.h
114616c8d5e7SWolfgang Denk
114716c8d5e7SWolfgang Denk			CONFIG_USB_DEVICE
114816c8d5e7SWolfgang Denk			Define this to build a UDC device
114916c8d5e7SWolfgang Denk
115016c8d5e7SWolfgang Denk			CONFIG_USB_TTY
115116c8d5e7SWolfgang Denk			Define this to have a tty type of device available to
115216c8d5e7SWolfgang Denk			talk to the UDC device
115316c8d5e7SWolfgang Denk
11546d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_CONSOLE_IS_IN_ENV
115516c8d5e7SWolfgang Denk			Define this if you want stdin, stdout &/or stderr to
115616c8d5e7SWolfgang Denk			be set to usbtty.
115716c8d5e7SWolfgang Denk
115816c8d5e7SWolfgang Denk			mpc8xx:
11596d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				CONFIG_SYS_USB_EXTC_CLK 0xBLAH
116016c8d5e7SWolfgang Denk				Derive USB clock from external clock "blah"
11616d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				- CONFIG_SYS_USB_EXTC_CLK 0x02
116216c8d5e7SWolfgang Denk
11636d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				CONFIG_SYS_USB_BRG_CLK 0xBLAH
116416c8d5e7SWolfgang Denk				Derive USB clock from brgclk
11656d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				- CONFIG_SYS_USB_BRG_CLK 0x04
116616c8d5e7SWolfgang Denk
116716c8d5e7SWolfgang Denk		If you have a USB-IF assigned VendorID then you may wish to
116816c8d5e7SWolfgang Denk		define your own vendor specific values either in BoardName.h
116916c8d5e7SWolfgang Denk		or directly in usbd_vendor_info.h. If you don't define
117016c8d5e7SWolfgang Denk		CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME,
117116c8d5e7SWolfgang Denk		CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot
117216c8d5e7SWolfgang Denk		should pretend to be a Linux device to it's target host.
117316c8d5e7SWolfgang Denk
117416c8d5e7SWolfgang Denk			CONFIG_USBD_MANUFACTURER
117516c8d5e7SWolfgang Denk			Define this string as the name of your company for
117616c8d5e7SWolfgang Denk			- CONFIG_USBD_MANUFACTURER "my company"
117716c8d5e7SWolfgang Denk
117816c8d5e7SWolfgang Denk			CONFIG_USBD_PRODUCT_NAME
117916c8d5e7SWolfgang Denk			Define this string as the name of your product
118016c8d5e7SWolfgang Denk			- CONFIG_USBD_PRODUCT_NAME "acme usb device"
118116c8d5e7SWolfgang Denk
118216c8d5e7SWolfgang Denk			CONFIG_USBD_VENDORID
118316c8d5e7SWolfgang Denk			Define this as your assigned Vendor ID from the USB
118416c8d5e7SWolfgang Denk			Implementors Forum. This *must* be a genuine Vendor ID
118516c8d5e7SWolfgang Denk			to avoid polluting the USB namespace.
118616c8d5e7SWolfgang Denk			- CONFIG_USBD_VENDORID 0xFFFF
118716c8d5e7SWolfgang Denk
118816c8d5e7SWolfgang Denk			CONFIG_USBD_PRODUCTID
118916c8d5e7SWolfgang Denk			Define this as the unique Product ID
119016c8d5e7SWolfgang Denk			for your device
119116c8d5e7SWolfgang Denk			- CONFIG_USBD_PRODUCTID 0xFFFF
1192c609719bSwdenk
1193d70a560fSIgor Grinberg- ULPI Layer Support:
1194d70a560fSIgor Grinberg		The ULPI (UTMI Low Pin (count) Interface) PHYs are supported via
1195d70a560fSIgor Grinberg		the generic ULPI layer. The generic layer accesses the ULPI PHY
1196d70a560fSIgor Grinberg		via the platform viewport, so you need both the genric layer and
1197d70a560fSIgor Grinberg		the viewport enabled. Currently only Chipidea/ARC based
1198d70a560fSIgor Grinberg		viewport is supported.
1199d70a560fSIgor Grinberg		To enable the ULPI layer support, define CONFIG_USB_ULPI and
1200d70a560fSIgor Grinberg		CONFIG_USB_ULPI_VIEWPORT in your board configuration file.
1201c609719bSwdenk
1202c609719bSwdenk- MMC Support:
1203c609719bSwdenk		The MMC controller on the Intel PXA is supported. To
1204c609719bSwdenk		enable this define CONFIG_MMC. The MMC can be
1205c609719bSwdenk		accessed from the boot prompt by mapping the device
1206c609719bSwdenk		to physical memory similar to flash. Command line is
1207602ad3b3SJon Loeliger		enabled with CONFIG_CMD_MMC. The MMC driver also works with
1208602ad3b3SJon Loeliger		the FAT fs. This is enabled with CONFIG_CMD_FAT.
1209c609719bSwdenk
1210afb35666SYoshihiro Shimoda		CONFIG_SH_MMCIF
1211afb35666SYoshihiro Shimoda		Support for Renesas on-chip MMCIF controller
1212afb35666SYoshihiro Shimoda
1213afb35666SYoshihiro Shimoda			CONFIG_SH_MMCIF_ADDR
1214afb35666SYoshihiro Shimoda			Define the base address of MMCIF registers
1215afb35666SYoshihiro Shimoda
1216afb35666SYoshihiro Shimoda			CONFIG_SH_MMCIF_CLK
1217afb35666SYoshihiro Shimoda			Define the clock frequency for MMCIF
1218afb35666SYoshihiro Shimoda
12196705d81eSwdenk- Journaling Flash filesystem support:
12206705d81eSwdenk		CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE,
12216705d81eSwdenk		CONFIG_JFFS2_NAND_DEV
12226705d81eSwdenk		Define these for a default partition on a NAND device
12236705d81eSwdenk
12246d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS2_FIRST_SECTOR,
12256d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS2_FIRST_BANK, CONFIG_SYS_JFFS2_NUM_BANKS
12266705d81eSwdenk		Define these for a default partition on a NOR device
12276705d81eSwdenk
12286d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS_CUSTOM_PART
12296705d81eSwdenk		Define this to create an own partition. You have to provide a
12306705d81eSwdenk		function struct part_info* jffs2_part_info(int part_num)
12316705d81eSwdenk
12326705d81eSwdenk		If you define only one JFFS2 partition you may also want to
12336d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		#define CONFIG_SYS_JFFS_SINGLE_PART	1
12346705d81eSwdenk		to disable the command chpart. This is the default when you
12356705d81eSwdenk		have not defined a custom partition
12366705d81eSwdenk
1237c30a15e5SDonggeun Kim- FAT(File Allocation Table) filesystem write function support:
1238c30a15e5SDonggeun Kim		CONFIG_FAT_WRITE
1239656f4c65SDonggeun Kim
1240656f4c65SDonggeun Kim		Define this to enable support for saving memory data as a
1241656f4c65SDonggeun Kim		file in FAT formatted partition.
1242656f4c65SDonggeun Kim
1243656f4c65SDonggeun Kim		This will also enable the command "fatwrite" enabling the
1244656f4c65SDonggeun Kim		user to write files to FAT.
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
2191f61ec45eSEric Nelson- Serial Flash support
2192f61ec45eSEric Nelson		CONFIG_CMD_SF
2193f61ec45eSEric Nelson
2194f61ec45eSEric Nelson		Defining this option enables SPI flash commands
2195f61ec45eSEric Nelson		'sf probe/read/write/erase/update'.
2196f61ec45eSEric Nelson
2197f61ec45eSEric Nelson		Usage requires an initial 'probe' to define the serial
2198f61ec45eSEric Nelson		flash parameters, followed by read/write/erase/update
2199f61ec45eSEric Nelson		commands.
2200f61ec45eSEric Nelson
2201f61ec45eSEric Nelson		The following defaults may be provided by the platform
2202f61ec45eSEric Nelson		to handle the common case when only a single serial
2203f61ec45eSEric Nelson		flash is present on the system.
2204f61ec45eSEric Nelson
2205f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_BUS		Bus identifier
2206f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_CS		Chip-select
2207f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_MODE 		(see include/spi.h)
2208f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_SPEED		in Hz
2209f61ec45eSEric Nelson
22103f85ce27Swdenk- SystemACE Support:
22113f85ce27Swdenk		CONFIG_SYSTEMACE
22123f85ce27Swdenk
22133f85ce27Swdenk		Adding this option adds support for Xilinx SystemACE
22143f85ce27Swdenk		chips attached via some sort of local bus. The address
221511ccc33fSMarcel Ziswiler		of the chip must also be defined in the
22166d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SYSTEMACE_BASE macro. For example:
22173f85ce27Swdenk
22183f85ce27Swdenk		#define CONFIG_SYSTEMACE
22196d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		#define CONFIG_SYS_SYSTEMACE_BASE 0xf0000000
22203f85ce27Swdenk
22213f85ce27Swdenk		When SystemACE support is added, the "ace" device type
22223f85ce27Swdenk		becomes available to the fat commands, i.e. fatls.
22233f85ce27Swdenk
2224ecb0ccd9SWolfgang Denk- TFTP Fixed UDP Port:
2225ecb0ccd9SWolfgang Denk		CONFIG_TFTP_PORT
2226ecb0ccd9SWolfgang Denk
222728cb9375SWolfgang Denk		If this is defined, the environment variable tftpsrcp
2228ecb0ccd9SWolfgang Denk		is used to supply the TFTP UDP source port value.
222928cb9375SWolfgang Denk		If tftpsrcp isn't defined, the normal pseudo-random port
2230ecb0ccd9SWolfgang Denk		number generator is used.
2231ecb0ccd9SWolfgang Denk
223228cb9375SWolfgang Denk		Also, the environment variable tftpdstp is used to supply
223328cb9375SWolfgang Denk		the TFTP UDP destination port value.  If tftpdstp isn't
223428cb9375SWolfgang Denk		defined, the normal port 69 is used.
223528cb9375SWolfgang Denk
223628cb9375SWolfgang Denk		The purpose for tftpsrcp is to allow a TFTP server to
2237ecb0ccd9SWolfgang Denk		blindly start the TFTP transfer using the pre-configured
2238ecb0ccd9SWolfgang Denk		target IP address and UDP port. This has the effect of
2239ecb0ccd9SWolfgang Denk		"punching through" the (Windows XP) firewall, allowing
2240ecb0ccd9SWolfgang Denk		the remainder of the TFTP transfer to proceed normally.
2241ecb0ccd9SWolfgang Denk		A better solution is to properly configure the firewall,
2242ecb0ccd9SWolfgang Denk		but sometimes that is not allowed.
2243ecb0ccd9SWolfgang Denk
2244a8c7c708Swdenk- Show boot progress:
2245c609719bSwdenk		CONFIG_SHOW_BOOT_PROGRESS
2246c609719bSwdenk
2247c609719bSwdenk		Defining this option allows to add some board-
2248c609719bSwdenk		specific code (calling a user-provided function
2249c609719bSwdenk		"show_boot_progress(int)") that enables you to show
2250c609719bSwdenk		the system's boot progress on some display (for
2251c609719bSwdenk		example, some LED's) on your board. At the moment,
2252c609719bSwdenk		the following checkpoints are implemented:
2253c609719bSwdenk
22543a608ca0SSimon Glass- Detailed boot stage timing
22553a608ca0SSimon Glass		CONFIG_BOOTSTAGE
22563a608ca0SSimon Glass		Define this option to get detailed timing of each stage
22573a608ca0SSimon Glass		of the boot process.
22583a608ca0SSimon Glass
22593a608ca0SSimon Glass		CONFIG_BOOTSTAGE_USER_COUNT
22603a608ca0SSimon Glass		This is the number of available user bootstage records.
22613a608ca0SSimon Glass		Each time you call bootstage_mark(BOOTSTAGE_ID_ALLOC, ...)
22623a608ca0SSimon Glass		a new ID will be allocated from this stash. If you exceed
22633a608ca0SSimon Glass		the limit, recording will stop.
22643a608ca0SSimon Glass
22653a608ca0SSimon Glass		CONFIG_BOOTSTAGE_REPORT
22663a608ca0SSimon Glass		Define this to print a report before boot, similar to this:
22673a608ca0SSimon Glass
22683a608ca0SSimon Glass		Timer summary in microseconds:
22693a608ca0SSimon Glass		       Mark    Elapsed  Stage
22703a608ca0SSimon Glass			  0          0  reset
22713a608ca0SSimon Glass		  3,575,678  3,575,678  board_init_f start
22723a608ca0SSimon Glass		  3,575,695         17  arch_cpu_init A9
22733a608ca0SSimon Glass		  3,575,777         82  arch_cpu_init done
22743a608ca0SSimon Glass		  3,659,598     83,821  board_init_r start
22753a608ca0SSimon Glass		  3,910,375    250,777  main_loop
22763a608ca0SSimon Glass		 29,916,167 26,005,792  bootm_start
22773a608ca0SSimon Glass		 30,361,327    445,160  start_kernel
22783a608ca0SSimon Glass
22791372cce2SMarian BalakowiczLegacy uImage format:
22801372cce2SMarian Balakowicz
2281c609719bSwdenk  Arg	Where			When
2282c609719bSwdenk    1	common/cmd_bootm.c	before attempting to boot an image
2283c609719bSwdenk   -1	common/cmd_bootm.c	Image header has bad	 magic number
2284c609719bSwdenk    2	common/cmd_bootm.c	Image header has correct magic number
2285c609719bSwdenk   -2	common/cmd_bootm.c	Image header has bad	 checksum
2286c609719bSwdenk    3	common/cmd_bootm.c	Image header has correct checksum
2287c609719bSwdenk   -3	common/cmd_bootm.c	Image data   has bad	 checksum
2288c609719bSwdenk    4	common/cmd_bootm.c	Image data   has correct checksum
2289c609719bSwdenk   -4	common/cmd_bootm.c	Image is for unsupported architecture
2290c609719bSwdenk    5	common/cmd_bootm.c	Architecture check OK
22911372cce2SMarian Balakowicz   -5	common/cmd_bootm.c	Wrong Image Type (not kernel, multi)
2292c609719bSwdenk    6	common/cmd_bootm.c	Image Type check OK
2293c609719bSwdenk   -6	common/cmd_bootm.c	gunzip uncompression error
2294c609719bSwdenk   -7	common/cmd_bootm.c	Unimplemented compression type
2295c609719bSwdenk    7	common/cmd_bootm.c	Uncompression OK
22961372cce2SMarian Balakowicz    8	common/cmd_bootm.c	No uncompress/copy overwrite error
2297c609719bSwdenk   -9	common/cmd_bootm.c	Unsupported OS (not Linux, BSD, VxWorks, QNX)
22981372cce2SMarian Balakowicz
22991372cce2SMarian Balakowicz    9	common/image.c		Start initial ramdisk verification
23001372cce2SMarian Balakowicz  -10	common/image.c		Ramdisk header has bad	   magic number
23011372cce2SMarian Balakowicz  -11	common/image.c		Ramdisk header has bad	   checksum
23021372cce2SMarian Balakowicz   10	common/image.c		Ramdisk header is OK
23031372cce2SMarian Balakowicz  -12	common/image.c		Ramdisk data   has bad	   checksum
23041372cce2SMarian Balakowicz   11	common/image.c		Ramdisk data   has correct checksum
23051372cce2SMarian Balakowicz   12	common/image.c		Ramdisk verification complete, start loading
230611ccc33fSMarcel Ziswiler  -13	common/image.c		Wrong Image Type (not PPC Linux ramdisk)
23071372cce2SMarian Balakowicz   13	common/image.c		Start multifile image verification
23081372cce2SMarian Balakowicz   14	common/image.c		No initial ramdisk, no multifile, continue.
23091372cce2SMarian Balakowicz
2310ea0364f1SPeter Tyser   15	arch/<arch>/lib/bootm.c All preparation done, transferring control to OS
2311c609719bSwdenk
2312a47a12beSStefan Roese  -30	arch/powerpc/lib/board.c	Fatal error, hang the system
231363e73c9aSwdenk  -31	post/post.c		POST test failed, detected by post_output_backlog()
231463e73c9aSwdenk  -32	post/post.c		POST test failed, detected by post_run_single()
231563e73c9aSwdenk
2316566a494fSHeiko Schocher   34	common/cmd_doc.c	before loading a Image from a DOC device
2317566a494fSHeiko Schocher  -35	common/cmd_doc.c	Bad usage of "doc" command
2318566a494fSHeiko Schocher   35	common/cmd_doc.c	correct usage of "doc" command
2319566a494fSHeiko Schocher  -36	common/cmd_doc.c	No boot device
2320566a494fSHeiko Schocher   36	common/cmd_doc.c	correct boot device
2321566a494fSHeiko Schocher  -37	common/cmd_doc.c	Unknown Chip ID on boot device
2322566a494fSHeiko Schocher   37	common/cmd_doc.c	correct chip ID found, device available
2323566a494fSHeiko Schocher  -38	common/cmd_doc.c	Read Error on boot device
2324566a494fSHeiko Schocher   38	common/cmd_doc.c	reading Image header from DOC device OK
2325566a494fSHeiko Schocher  -39	common/cmd_doc.c	Image header has bad magic number
2326566a494fSHeiko Schocher   39	common/cmd_doc.c	Image header has correct magic number
2327566a494fSHeiko Schocher  -40	common/cmd_doc.c	Error reading Image from DOC device
2328566a494fSHeiko Schocher   40	common/cmd_doc.c	Image header has correct magic number
2329566a494fSHeiko Schocher   41	common/cmd_ide.c	before loading a Image from a IDE device
2330566a494fSHeiko Schocher  -42	common/cmd_ide.c	Bad usage of "ide" command
2331566a494fSHeiko Schocher   42	common/cmd_ide.c	correct usage of "ide" command
2332566a494fSHeiko Schocher  -43	common/cmd_ide.c	No boot device
2333566a494fSHeiko Schocher   43	common/cmd_ide.c	boot device found
2334566a494fSHeiko Schocher  -44	common/cmd_ide.c	Device not available
2335566a494fSHeiko Schocher   44	common/cmd_ide.c	Device available
2336566a494fSHeiko Schocher  -45	common/cmd_ide.c	wrong partition selected
2337566a494fSHeiko Schocher   45	common/cmd_ide.c	partition selected
2338566a494fSHeiko Schocher  -46	common/cmd_ide.c	Unknown partition table
2339566a494fSHeiko Schocher   46	common/cmd_ide.c	valid partition table found
2340566a494fSHeiko Schocher  -47	common/cmd_ide.c	Invalid partition type
2341566a494fSHeiko Schocher   47	common/cmd_ide.c	correct partition type
2342566a494fSHeiko Schocher  -48	common/cmd_ide.c	Error reading Image Header on boot device
2343566a494fSHeiko Schocher   48	common/cmd_ide.c	reading Image Header from IDE device OK
2344566a494fSHeiko Schocher  -49	common/cmd_ide.c	Image header has bad magic number
2345566a494fSHeiko Schocher   49	common/cmd_ide.c	Image header has correct magic number
2346566a494fSHeiko Schocher  -50	common/cmd_ide.c	Image header has bad	 checksum
2347566a494fSHeiko Schocher   50	common/cmd_ide.c	Image header has correct checksum
2348566a494fSHeiko Schocher  -51	common/cmd_ide.c	Error reading Image from IDE device
2349566a494fSHeiko Schocher   51	common/cmd_ide.c	reading Image from IDE device OK
2350566a494fSHeiko Schocher   52	common/cmd_nand.c	before loading a Image from a NAND device
2351566a494fSHeiko Schocher  -53	common/cmd_nand.c	Bad usage of "nand" command
2352566a494fSHeiko Schocher   53	common/cmd_nand.c	correct usage of "nand" command
2353566a494fSHeiko Schocher  -54	common/cmd_nand.c	No boot device
2354566a494fSHeiko Schocher   54	common/cmd_nand.c	boot device found
2355566a494fSHeiko Schocher  -55	common/cmd_nand.c	Unknown Chip ID on boot device
2356566a494fSHeiko Schocher   55	common/cmd_nand.c	correct chip ID found, device available
2357566a494fSHeiko Schocher  -56	common/cmd_nand.c	Error reading Image Header on boot device
2358566a494fSHeiko Schocher   56	common/cmd_nand.c	reading Image Header from NAND device OK
2359566a494fSHeiko Schocher  -57	common/cmd_nand.c	Image header has bad magic number
2360566a494fSHeiko Schocher   57	common/cmd_nand.c	Image header has correct magic number
2361566a494fSHeiko Schocher  -58	common/cmd_nand.c	Error reading Image from NAND device
2362566a494fSHeiko Schocher   58	common/cmd_nand.c	reading Image from NAND device OK
2363c609719bSwdenk
2364566a494fSHeiko Schocher  -60	common/env_common.c	Environment has a bad CRC, using default
2365c609719bSwdenk
2366566a494fSHeiko Schocher   64	net/eth.c		starting with Ethernet configuration.
2367566a494fSHeiko Schocher  -64	net/eth.c		no Ethernet found.
2368566a494fSHeiko Schocher   65	net/eth.c		Ethernet found.
2369206c60cbSwdenk
2370566a494fSHeiko Schocher  -80	common/cmd_net.c	usage wrong
2371566a494fSHeiko Schocher   80	common/cmd_net.c	before calling NetLoop()
237211ccc33fSMarcel Ziswiler  -81	common/cmd_net.c	some error in NetLoop() occurred
2373566a494fSHeiko Schocher   81	common/cmd_net.c	NetLoop() back without error
2374566a494fSHeiko Schocher  -82	common/cmd_net.c	size == 0 (File with size 0 loaded)
2375566a494fSHeiko Schocher   82	common/cmd_net.c	trying automatic boot
237674de7aefSWolfgang Denk   83	common/cmd_net.c	running "source" command
237774de7aefSWolfgang Denk  -83	common/cmd_net.c	some error in automatic boot or "source" command
2378566a494fSHeiko Schocher   84	common/cmd_net.c	end without errors
2379c609719bSwdenk
23801372cce2SMarian BalakowiczFIT uImage format:
23811372cce2SMarian Balakowicz
23821372cce2SMarian Balakowicz  Arg	Where			When
23831372cce2SMarian Balakowicz  100	common/cmd_bootm.c	Kernel FIT Image has correct format
23841372cce2SMarian Balakowicz -100	common/cmd_bootm.c	Kernel FIT Image has incorrect format
23851372cce2SMarian Balakowicz  101	common/cmd_bootm.c	No Kernel subimage unit name, using configuration
23861372cce2SMarian Balakowicz -101	common/cmd_bootm.c	Can't get configuration for kernel subimage
23871372cce2SMarian Balakowicz  102	common/cmd_bootm.c	Kernel unit name specified
23881372cce2SMarian Balakowicz -103	common/cmd_bootm.c	Can't get kernel subimage node offset
2389f773bea8SMarian Balakowicz  103	common/cmd_bootm.c	Found configuration node
23901372cce2SMarian Balakowicz  104	common/cmd_bootm.c	Got kernel subimage node offset
23911372cce2SMarian Balakowicz -104	common/cmd_bootm.c	Kernel subimage hash verification failed
23921372cce2SMarian Balakowicz  105	common/cmd_bootm.c	Kernel subimage hash verification OK
23931372cce2SMarian Balakowicz -105	common/cmd_bootm.c	Kernel subimage is for unsupported architecture
23941372cce2SMarian Balakowicz  106	common/cmd_bootm.c	Architecture check OK
239511ccc33fSMarcel Ziswiler -106	common/cmd_bootm.c	Kernel subimage has wrong type
239611ccc33fSMarcel Ziswiler  107	common/cmd_bootm.c	Kernel subimage type OK
23971372cce2SMarian Balakowicz -107	common/cmd_bootm.c	Can't get kernel subimage data/size
23981372cce2SMarian Balakowicz  108	common/cmd_bootm.c	Got kernel subimage data/size
23991372cce2SMarian Balakowicz -108	common/cmd_bootm.c	Wrong image type (not legacy, FIT)
24001372cce2SMarian Balakowicz -109	common/cmd_bootm.c	Can't get kernel subimage type
24011372cce2SMarian Balakowicz -110	common/cmd_bootm.c	Can't get kernel subimage comp
24021372cce2SMarian Balakowicz -111	common/cmd_bootm.c	Can't get kernel subimage os
24031372cce2SMarian Balakowicz -112	common/cmd_bootm.c	Can't get kernel subimage load address
24041372cce2SMarian Balakowicz -113	common/cmd_bootm.c	Image uncompress/copy overwrite error
24051372cce2SMarian Balakowicz
24061372cce2SMarian Balakowicz  120	common/image.c		Start initial ramdisk verification
24071372cce2SMarian Balakowicz -120	common/image.c		Ramdisk FIT image has incorrect format
24081372cce2SMarian Balakowicz  121	common/image.c		Ramdisk FIT image has correct format
240911ccc33fSMarcel Ziswiler  122	common/image.c		No ramdisk subimage unit name, using configuration
24101372cce2SMarian Balakowicz -122	common/image.c		Can't get configuration for ramdisk subimage
24111372cce2SMarian Balakowicz  123	common/image.c		Ramdisk unit name specified
24121372cce2SMarian Balakowicz -124	common/image.c		Can't get ramdisk subimage node offset
24131372cce2SMarian Balakowicz  125	common/image.c		Got ramdisk subimage node offset
24141372cce2SMarian Balakowicz -125	common/image.c		Ramdisk subimage hash verification failed
24151372cce2SMarian Balakowicz  126	common/image.c		Ramdisk subimage hash verification OK
24161372cce2SMarian Balakowicz -126	common/image.c		Ramdisk subimage for unsupported architecture
24171372cce2SMarian Balakowicz  127	common/image.c		Architecture check OK
24181372cce2SMarian Balakowicz -127	common/image.c		Can't get ramdisk subimage data/size
24191372cce2SMarian Balakowicz  128	common/image.c		Got ramdisk subimage data/size
24201372cce2SMarian Balakowicz  129	common/image.c		Can't get ramdisk load address
24211372cce2SMarian Balakowicz -129	common/image.c		Got ramdisk load address
24221372cce2SMarian Balakowicz
242311ccc33fSMarcel Ziswiler -130	common/cmd_doc.c	Incorrect FIT image format
24241372cce2SMarian Balakowicz  131	common/cmd_doc.c	FIT image format OK
24251372cce2SMarian Balakowicz
242611ccc33fSMarcel Ziswiler -140	common/cmd_ide.c	Incorrect FIT image format
24271372cce2SMarian Balakowicz  141	common/cmd_ide.c	FIT image format OK
24281372cce2SMarian Balakowicz
242911ccc33fSMarcel Ziswiler -150	common/cmd_nand.c	Incorrect FIT image format
24301372cce2SMarian Balakowicz  151	common/cmd_nand.c	FIT image format OK
24311372cce2SMarian Balakowicz
24324cf2609bSWolfgang Denk- Standalone program support:
24334cf2609bSWolfgang Denk		CONFIG_STANDALONE_LOAD_ADDR
24344cf2609bSWolfgang Denk
24356feff899SWolfgang Denk		This option defines a board specific value for the
24366feff899SWolfgang Denk		address where standalone program gets loaded, thus
24376feff899SWolfgang Denk		overwriting the architecture dependent default
24384cf2609bSWolfgang Denk		settings.
24394cf2609bSWolfgang Denk
24404cf2609bSWolfgang Denk- Frame Buffer Address:
24414cf2609bSWolfgang Denk		CONFIG_FB_ADDR
24424cf2609bSWolfgang Denk
24434cf2609bSWolfgang Denk		Define CONFIG_FB_ADDR if you want to use specific
24444cf2609bSWolfgang Denk		address for frame buffer.
24454cf2609bSWolfgang Denk		Then system will reserve the frame buffer address to
24464cf2609bSWolfgang Denk		defined address instead of lcd_setmem (this function
24476feff899SWolfgang Denk		grabs the memory for frame buffer by panel's size).
24484cf2609bSWolfgang Denk
24494cf2609bSWolfgang Denk		Please see board_init_f function.
24504cf2609bSWolfgang Denk
2451cccfc2abSDetlev Zundel- Automatic software updates via TFTP server
2452cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP
2453cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP_CNT_MAX
2454cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP_MSEC_MAX
2455cccfc2abSDetlev Zundel
2456cccfc2abSDetlev Zundel		These options enable and control the auto-update feature;
2457cccfc2abSDetlev Zundel		for a more detailed description refer to doc/README.update.
2458cccfc2abSDetlev Zundel
2459cccfc2abSDetlev Zundel- MTD Support (mtdparts command, UBI support)
2460cccfc2abSDetlev Zundel		CONFIG_MTD_DEVICE
2461cccfc2abSDetlev Zundel
2462cccfc2abSDetlev Zundel		Adds the MTD device infrastructure from the Linux kernel.
2463cccfc2abSDetlev Zundel		Needed for mtdparts command support.
2464cccfc2abSDetlev Zundel
2465cccfc2abSDetlev Zundel		CONFIG_MTD_PARTITIONS
2466cccfc2abSDetlev Zundel
2467cccfc2abSDetlev Zundel		Adds the MTD partitioning infrastructure from the Linux
2468cccfc2abSDetlev Zundel		kernel. Needed for UBI support.
2469cccfc2abSDetlev Zundel
24706a11cf48SDaniel Schwierzeck- SPL framework
24716a11cf48SDaniel Schwierzeck		CONFIG_SPL
24726a11cf48SDaniel Schwierzeck		Enable building of SPL globally.
24736a11cf48SDaniel Schwierzeck
247495579793STom Rini		CONFIG_SPL_LDSCRIPT
247595579793STom Rini		LDSCRIPT for linking the SPL binary.
247695579793STom Rini
247795579793STom Rini		CONFIG_SPL_MAX_SIZE
247895579793STom Rini		Maximum binary size (text, data and rodata) of the SPL binary.
247995579793STom Rini
24806a11cf48SDaniel Schwierzeck		CONFIG_SPL_TEXT_BASE
24816a11cf48SDaniel Schwierzeck		TEXT_BASE for linking the SPL binary.
24826a11cf48SDaniel Schwierzeck
248395579793STom Rini		CONFIG_SPL_BSS_START_ADDR
248495579793STom Rini		Link address for the BSS within the SPL binary.
248595579793STom Rini
248695579793STom Rini		CONFIG_SPL_BSS_MAX_SIZE
248795579793STom Rini		Maximum binary size of the BSS section of the SPL binary.
248895579793STom Rini
248995579793STom Rini		CONFIG_SPL_STACK
249095579793STom Rini		Adress of the start of the stack SPL will use
249195579793STom Rini
249295579793STom Rini		CONFIG_SYS_SPL_MALLOC_START
249395579793STom Rini		Starting address of the malloc pool used in SPL.
249495579793STom Rini
249595579793STom Rini		CONFIG_SYS_SPL_MALLOC_SIZE
249695579793STom Rini		The size of the malloc pool used in SPL.
24976a11cf48SDaniel Schwierzeck
24986a11cf48SDaniel Schwierzeck		CONFIG_SPL_LIBCOMMON_SUPPORT
24996a11cf48SDaniel Schwierzeck		Support for common/libcommon.o in SPL binary
25006a11cf48SDaniel Schwierzeck
25016a11cf48SDaniel Schwierzeck		CONFIG_SPL_LIBDISK_SUPPORT
25026a11cf48SDaniel Schwierzeck		Support for disk/libdisk.o in SPL binary
25036a11cf48SDaniel Schwierzeck
25046a11cf48SDaniel Schwierzeck		CONFIG_SPL_I2C_SUPPORT
25056a11cf48SDaniel Schwierzeck		Support for drivers/i2c/libi2c.o in SPL binary
25066a11cf48SDaniel Schwierzeck
25076a11cf48SDaniel Schwierzeck		CONFIG_SPL_GPIO_SUPPORT
25086a11cf48SDaniel Schwierzeck		Support for drivers/gpio/libgpio.o in SPL binary
25096a11cf48SDaniel Schwierzeck
25106a11cf48SDaniel Schwierzeck		CONFIG_SPL_MMC_SUPPORT
25116a11cf48SDaniel Schwierzeck		Support for drivers/mmc/libmmc.o in SPL binary
25126a11cf48SDaniel Schwierzeck
251395579793STom Rini		CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR,
251495579793STom Rini		CONFIG_SYS_U_BOOT_MAX_SIZE_SECTORS,
251595579793STom Rini		CONFIG_SYS_MMC_SD_FAT_BOOT_PARTITION
251695579793STom Rini		Address, size and partition on the MMC to load U-Boot from
251795579793STom Rini		when the MMC is being used in raw mode.
251895579793STom Rini
251995579793STom Rini		CONFIG_SPL_FAT_SUPPORT
252095579793STom Rini		Support for fs/fat/libfat.o in SPL binary
252195579793STom Rini
252295579793STom Rini		CONFIG_SPL_FAT_LOAD_PAYLOAD_NAME
252395579793STom Rini		Filename to read to load U-Boot when reading from FAT
252495579793STom Rini
252595579793STom Rini		CONFIG_SPL_NAND_SIMPLE
252695579793STom Rini		Support for drivers/mtd/nand/libnand.o in SPL binary
252795579793STom Rini
252895579793STom Rini		CONFIG_SYS_NAND_5_ADDR_CYCLE, CONFIG_SYS_NAND_PAGE_COUNT,
252995579793STom Rini		CONFIG_SYS_NAND_PAGE_SIZE, CONFIG_SYS_NAND_OOBSIZE,
253095579793STom Rini		CONFIG_SYS_NAND_BLOCK_SIZE, CONFIG_SYS_NAND_BAD_BLOCK_POS,
253195579793STom Rini		CONFIG_SYS_NAND_ECCPOS, CONFIG_SYS_NAND_ECCSIZE,
253295579793STom Rini		CONFIG_SYS_NAND_ECCBYTES
253395579793STom Rini		Defines the size and behavior of the NAND that SPL uses
253495579793STom Rini		to read U-Boot with CONFIG_SPL_NAND_SIMPLE
253595579793STom Rini
253695579793STom Rini		CONFIG_SYS_NAND_U_BOOT_OFFS
253795579793STom Rini		Location in NAND for CONFIG_SPL_NAND_SIMPLE to read U-Boot
253895579793STom Rini		from.
253995579793STom Rini
254095579793STom Rini		CONFIG_SYS_NAND_U_BOOT_START
254195579793STom Rini		Location in memory for CONFIG_SPL_NAND_SIMPLE to load U-Boot
254295579793STom Rini		to.
254395579793STom Rini
254495579793STom Rini		CONFIG_SYS_NAND_HW_ECC_OOBFIRST
254595579793STom Rini		Define this if you need to first read the OOB and then the
254695579793STom Rini		data. This is used for example on davinci plattforms.
254795579793STom Rini
254895579793STom Rini		CONFIG_SPL_OMAP3_ID_NAND
254995579793STom Rini		Support for an OMAP3-specific set of functions to return the
255095579793STom Rini		ID and MFR of the first attached NAND chip, if present.
255195579793STom Rini
25526a11cf48SDaniel Schwierzeck		CONFIG_SPL_SERIAL_SUPPORT
25536a11cf48SDaniel Schwierzeck		Support for drivers/serial/libserial.o in SPL binary
25546a11cf48SDaniel Schwierzeck
25556a11cf48SDaniel Schwierzeck		CONFIG_SPL_SPI_FLASH_SUPPORT
25566a11cf48SDaniel Schwierzeck		Support for drivers/mtd/spi/libspi_flash.o in SPL binary
25576a11cf48SDaniel Schwierzeck
25586a11cf48SDaniel Schwierzeck		CONFIG_SPL_SPI_SUPPORT
25596a11cf48SDaniel Schwierzeck		Support for drivers/spi/libspi.o in SPL binary
25606a11cf48SDaniel Schwierzeck
25616a11cf48SDaniel Schwierzeck		CONFIG_SPL_LIBGENERIC_SUPPORT
25626a11cf48SDaniel Schwierzeck		Support for lib/libgeneric.o in SPL binary
25631372cce2SMarian Balakowicz
2564c609719bSwdenkModem Support:
2565c609719bSwdenk--------------
2566c609719bSwdenk
2567566e5cf4SWolfgang Denk[so far only for SMDK2400 boards]
2568c609719bSwdenk
256911ccc33fSMarcel Ziswiler- Modem support enable:
2570c609719bSwdenk		CONFIG_MODEM_SUPPORT
2571c609719bSwdenk
2572c609719bSwdenk- RTS/CTS Flow control enable:
2573c609719bSwdenk		CONFIG_HWFLOW
2574c609719bSwdenk
2575c609719bSwdenk- Modem debug support:
2576c609719bSwdenk		CONFIG_MODEM_SUPPORT_DEBUG
2577c609719bSwdenk
2578c609719bSwdenk		Enables debugging stuff (char screen[1024], dbg())
2579c609719bSwdenk		for modem support. Useful only with BDI2000.
2580c609719bSwdenk
2581a8c7c708Swdenk- Interrupt support (PPC):
2582a8c7c708Swdenk
2583a8c7c708Swdenk		There are common interrupt_init() and timer_interrupt()
2584a8c7c708Swdenk		for all PPC archs. interrupt_init() calls interrupt_init_cpu()
258511ccc33fSMarcel Ziswiler		for CPU specific initialization. interrupt_init_cpu()
2586a8c7c708Swdenk		should set decrementer_count to appropriate value. If
258711ccc33fSMarcel Ziswiler		CPU resets decrementer automatically after interrupt
2588a8c7c708Swdenk		(ppc4xx) it should set decrementer_count to zero.
258911ccc33fSMarcel Ziswiler		timer_interrupt() calls timer_interrupt_cpu() for CPU
2590a8c7c708Swdenk		specific handling. If board has watchdog / status_led
2591a8c7c708Swdenk		/ other_activity_monitor it works automatically from
2592a8c7c708Swdenk		general timer_interrupt().
2593a8c7c708Swdenk
2594c609719bSwdenk- General:
2595c609719bSwdenk
2596c609719bSwdenk		In the target system modem support is enabled when a
2597c609719bSwdenk		specific key (key combination) is pressed during
2598c609719bSwdenk		power-on. Otherwise U-Boot will boot normally
259911ccc33fSMarcel Ziswiler		(autoboot). The key_pressed() function is called from
2600c609719bSwdenk		board_init(). Currently key_pressed() is a dummy
2601c609719bSwdenk		function, returning 1 and thus enabling modem
2602c609719bSwdenk		initialization.
2603c609719bSwdenk
2604c609719bSwdenk		If there are no modem init strings in the
2605c609719bSwdenk		environment, U-Boot proceed to autoboot; the
2606c609719bSwdenk		previous output (banner, info printfs) will be
260711ccc33fSMarcel Ziswiler		suppressed, though.
2608c609719bSwdenk
2609c609719bSwdenk		See also: doc/README.Modem
2610c609719bSwdenk
26119660e442SHelmut RaigerBoard initialization settings:
26129660e442SHelmut Raiger------------------------------
26139660e442SHelmut Raiger
26149660e442SHelmut RaigerDuring Initialization u-boot calls a number of board specific functions
26159660e442SHelmut Raigerto allow the preparation of board specific prerequisites, e.g. pin setup
26169660e442SHelmut Raigerbefore drivers are initialized. To enable these callbacks the
26179660e442SHelmut Raigerfollowing configuration macros have to be defined. Currently this is
26189660e442SHelmut Raigerarchitecture specific, so please check arch/your_architecture/lib/board.c
26199660e442SHelmut Raigertypically in board_init_f() and board_init_r().
26209660e442SHelmut Raiger
26219660e442SHelmut Raiger- CONFIG_BOARD_EARLY_INIT_F: Call board_early_init_f()
26229660e442SHelmut Raiger- CONFIG_BOARD_EARLY_INIT_R: Call board_early_init_r()
26239660e442SHelmut Raiger- CONFIG_BOARD_LATE_INIT: Call board_late_init()
26249660e442SHelmut Raiger- CONFIG_BOARD_POSTCLK_INIT: Call board_postclk_init()
2625c609719bSwdenk
2626c609719bSwdenkConfiguration Settings:
2627c609719bSwdenk-----------------------
2628c609719bSwdenk
26296d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_LONGHELP: Defined when you want long help messages included;
2630c609719bSwdenk		undefine this when you're short of memory.
2631c609719bSwdenk
26322fb2604dSPeter Tyser- CONFIG_SYS_HELP_CMD_WIDTH: Defined when you want to override the default
26332fb2604dSPeter Tyser		width of the commands listed in the 'help' command output.
26342fb2604dSPeter Tyser
26356d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PROMPT:	This is what U-Boot prints on the console to
2636c609719bSwdenk		prompt for user input.
2637c609719bSwdenk
26386d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CBSIZE:	Buffer size for input from the Console
2639c609719bSwdenk
26406d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PBSIZE:	Buffer size for Console output
2641c609719bSwdenk
26426d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAXARGS:	max. Number of arguments accepted for monitor commands
2643c609719bSwdenk
26446d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BARGSIZE: Buffer size for Boot Arguments which are passed to
2645c609719bSwdenk		the application (usually a Linux kernel) when it is
2646c609719bSwdenk		booted
2647c609719bSwdenk
26486d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BAUDRATE_TABLE:
2649c609719bSwdenk		List of legal baudrate settings for this board.
2650c609719bSwdenk
26516d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_INFO_QUIET
2652c609719bSwdenk		Suppress display of console information at boot.
2653c609719bSwdenk
26546d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_IS_IN_ENV
2655c609719bSwdenk		If the board specific function
2656c609719bSwdenk			extern int overwrite_console (void);
2657c609719bSwdenk		returns 1, the stdin, stderr and stdout are switched to the
2658c609719bSwdenk		serial port, else the settings in the environment are used.
2659c609719bSwdenk
26606d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
2661c609719bSwdenk		Enable the call to overwrite_console().
2662c609719bSwdenk
26636d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_ENV_OVERWRITE
2664c609719bSwdenk		Enable overwrite of previous console environment settings.
2665c609719bSwdenk
26666d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEMTEST_START, CONFIG_SYS_MEMTEST_END:
2667c609719bSwdenk		Begin and End addresses of the area used by the
2668c609719bSwdenk		simple memory test.
2669c609719bSwdenk
26706d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_ALT_MEMTEST:
2671c609719bSwdenk		Enable an alternate, more extensive memory test.
2672c609719bSwdenk
26736d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEMTEST_SCRATCH:
26745f535fe1Swdenk		Scratch address used by the alternate memory test
26755f535fe1Swdenk		You only need to set this if address zero isn't writeable
26765f535fe1Swdenk
26776d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEM_TOP_HIDE (PPC only):
26786d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		If CONFIG_SYS_MEM_TOP_HIDE is defined in the board config header,
267914f73ca6SStefan Roese		this specified memory area will get subtracted from the top
268011ccc33fSMarcel Ziswiler		(end) of RAM and won't get "touched" at all by U-Boot. By
268114f73ca6SStefan Roese		fixing up gd->ram_size the Linux kernel should gets passed
268214f73ca6SStefan Roese		the now "corrected" memory size and won't touch it either.
268314f73ca6SStefan Roese		This should work for arch/ppc and arch/powerpc. Only Linux
26845e12e75dSStefan Roese		board ports in arch/powerpc with bootwrapper support that
268514f73ca6SStefan Roese		recalculate the memory size from the SDRAM controller setup
26865e12e75dSStefan Roese		will have to get fixed in Linux additionally.
268714f73ca6SStefan Roese
268814f73ca6SStefan Roese		This option can be used as a workaround for the 440EPx/GRx
268914f73ca6SStefan Roese		CHIP 11 errata where the last 256 bytes in SDRAM shouldn't
269014f73ca6SStefan Roese		be touched.
269114f73ca6SStefan Roese
269214f73ca6SStefan Roese		WARNING: Please make sure that this value is a multiple of
269314f73ca6SStefan Roese		the Linux page size (normally 4k). If this is not the case,
269414f73ca6SStefan Roese		then the end address of the Linux memory will be located at a
269514f73ca6SStefan Roese		non page size aligned address and this could cause major
269614f73ca6SStefan Roese		problems.
269714f73ca6SStefan Roese
26986d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_TFTP_LOADADDR:
2699c609719bSwdenk		Default load address for network file downloads
2700c609719bSwdenk
27016d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_LOADS_BAUD_CHANGE:
2702c609719bSwdenk		Enable temporary baudrate change while serial download
2703c609719bSwdenk
27046d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SDRAM_BASE:
2705c609719bSwdenk		Physical start address of SDRAM. _Must_ be 0 here.
2706c609719bSwdenk
27076d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MBIO_BASE:
2708c609719bSwdenk		Physical start address of Motherboard I/O (if using a
2709c609719bSwdenk		Cogent motherboard)
2710c609719bSwdenk
27116d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_BASE:
2712c609719bSwdenk		Physical start address of Flash memory.
2713c609719bSwdenk
27146d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MONITOR_BASE:
2715c609719bSwdenk		Physical start address of boot monitor code (set by
2716c609719bSwdenk		make config files to be same as the text base address
271714d0a02aSWolfgang Denk		(CONFIG_SYS_TEXT_BASE) used when linking) - same as
27186d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FLASH_BASE when booting from flash.
2719c609719bSwdenk
27206d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MONITOR_LEN:
27213b57fe0aSwdenk		Size of memory reserved for monitor code, used to
27223b57fe0aSwdenk		determine _at_compile_time_ (!) if the environment is
27233b57fe0aSwdenk		embedded within the U-Boot image, or in a separate
27243b57fe0aSwdenk		flash sector.
2725c609719bSwdenk
27266d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MALLOC_LEN:
2727c609719bSwdenk		Size of DRAM reserved for malloc() use.
2728c609719bSwdenk
27296d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BOOTM_LEN:
273015940c9aSStefan Roese		Normally compressed uImages are limited to an
273115940c9aSStefan Roese		uncompressed size of 8 MBytes. If this is not enough,
27326d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		you can define CONFIG_SYS_BOOTM_LEN in your board config file
273315940c9aSStefan Roese		to adjust this setting to your needs.
2734c609719bSwdenk
27356d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BOOTMAPSZ:
2736c609719bSwdenk		Maximum size of memory mapped by the startup code of
2737c609719bSwdenk		the Linux kernel; all data that must be processed by
27387d721e34SBartlomiej Sieka		the Linux kernel (bd_info, boot arguments, FDT blob if
27397d721e34SBartlomiej Sieka		used) must be put below this limit, unless "bootm_low"
27407d721e34SBartlomiej Sieka		enviroment variable is defined and non-zero. In such case
27417d721e34SBartlomiej Sieka		all data for the Linux kernel must be between "bootm_low"
2742c3624e6eSGrant Likely		and "bootm_low" + CONFIG_SYS_BOOTMAPSZ.	 The environment
2743c3624e6eSGrant Likely		variable "bootm_mapsize" will override the value of
2744c3624e6eSGrant Likely		CONFIG_SYS_BOOTMAPSZ.  If CONFIG_SYS_BOOTMAPSZ is undefined,
2745c3624e6eSGrant Likely		then the value in "bootm_size" will be used instead.
2746c609719bSwdenk
2747fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_RAMDISK_HIGH:
2748fca43cc8SJohn Rigby		Enable initrd_high functionality.  If defined then the
2749fca43cc8SJohn Rigby		initrd_high feature is enabled and the bootm ramdisk subcommand
2750fca43cc8SJohn Rigby		is enabled.
2751fca43cc8SJohn Rigby
2752fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_GET_CMDLINE:
2753fca43cc8SJohn Rigby		Enables allocating and saving kernel cmdline in space between
2754fca43cc8SJohn Rigby		"bootm_low" and "bootm_low" + BOOTMAPSZ.
2755fca43cc8SJohn Rigby
2756fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_GET_KBD:
2757fca43cc8SJohn Rigby		Enables allocating and saving a kernel copy of the bd_info in
2758fca43cc8SJohn Rigby		space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
2759fca43cc8SJohn Rigby
27606d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAX_FLASH_BANKS:
2761c609719bSwdenk		Max number of Flash memory banks
2762c609719bSwdenk
27636d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAX_FLASH_SECT:
2764c609719bSwdenk		Max number of sectors on a Flash chip
2765c609719bSwdenk
27666d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_ERASE_TOUT:
2767c609719bSwdenk		Timeout for Flash erase operations (in ms)
2768c609719bSwdenk
27696d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_WRITE_TOUT:
2770c609719bSwdenk		Timeout for Flash write operations (in ms)
2771c609719bSwdenk
27726d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_LOCK_TOUT
27738564acf9Swdenk		Timeout for Flash set sector lock bit operation (in ms)
27748564acf9Swdenk
27756d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_UNLOCK_TOUT
27768564acf9Swdenk		Timeout for Flash clear lock bits operation (in ms)
27778564acf9Swdenk
27786d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_PROTECTION
27798564acf9Swdenk		If defined, hardware flash sectors protection is used
27808564acf9Swdenk		instead of U-Boot software protection.
27818564acf9Swdenk
27826d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DIRECT_FLASH_TFTP:
2783c609719bSwdenk
2784c609719bSwdenk		Enable TFTP transfers directly to flash memory;
2785c609719bSwdenk		without this option such a download has to be
2786c609719bSwdenk		performed in two steps: (1) download to RAM, and (2)
2787c609719bSwdenk		copy from RAM to flash.
2788c609719bSwdenk
2789c609719bSwdenk		The two-step approach is usually more reliable, since
2790c609719bSwdenk		you can check if the download worked before you erase
279111ccc33fSMarcel Ziswiler		the flash, but in some situations (when system RAM is
279211ccc33fSMarcel Ziswiler		too limited to allow for a temporary copy of the
2793c609719bSwdenk		downloaded image) this option may be very useful.
2794c609719bSwdenk
27956d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_CFI:
2796c609719bSwdenk		Define if the flash driver uses extra elements in the
27975653fc33Swdenk		common flash structure for storing flash geometry.
27985653fc33Swdenk
279900b1883aSJean-Christophe PLAGNIOL-VILLARD- CONFIG_FLASH_CFI_DRIVER
28005653fc33Swdenk		This option also enables the building of the cfi_flash driver
28015653fc33Swdenk		in the drivers directory
280253cf9435Sstroese
280391809ed5SPiotr Ziecik- CONFIG_FLASH_CFI_MTD
280491809ed5SPiotr Ziecik		This option enables the building of the cfi_mtd driver
280591809ed5SPiotr Ziecik		in the drivers directory. The driver exports CFI flash
280691809ed5SPiotr Ziecik		to the MTD layer.
280791809ed5SPiotr Ziecik
28086d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_USE_BUFFER_WRITE
280996ef831fSGuennadi Liakhovetski		Use buffered writes to flash.
281096ef831fSGuennadi Liakhovetski
281196ef831fSGuennadi Liakhovetski- CONFIG_FLASH_SPANSION_S29WS_N
281296ef831fSGuennadi Liakhovetski		s29ws-n MirrorBit flash has non-standard addresses for buffered
281396ef831fSGuennadi Liakhovetski		write commands.
281496ef831fSGuennadi Liakhovetski
28156d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_QUIET_TEST
28165568e613SStefan Roese		If this option is defined, the common CFI flash doesn't
28175568e613SStefan Roese		print it's warning upon not recognized FLASH banks. This
28185568e613SStefan Roese		is useful, if some of the configured banks are only
28195568e613SStefan Roese		optionally available.
28205568e613SStefan Roese
28219a042e9cSJerry Van Baren- CONFIG_FLASH_SHOW_PROGRESS
28229a042e9cSJerry Van Baren		If defined (must be an integer), print out countdown
28239a042e9cSJerry Van Baren		digits and dots.  Recommended value: 45 (9..1) for 80
28249a042e9cSJerry Van Baren		column displays, 15 (3..1) for 40 column displays.
28259a042e9cSJerry Van Baren
28266d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_RX_ETH_BUFFER:
282711ccc33fSMarcel Ziswiler		Defines the number of Ethernet receive buffers. On some
282811ccc33fSMarcel Ziswiler		Ethernet controllers it is recommended to set this value
282953cf9435Sstroese		to 8 or even higher (EEPRO100 or 405 EMAC), since all
283053cf9435Sstroese		buffers can be full shortly after enabling the interface
283111ccc33fSMarcel Ziswiler		on high Ethernet traffic.
283253cf9435Sstroese		Defaults to 4 if not defined.
2833c609719bSwdenk
2834ea882bafSWolfgang Denk- CONFIG_ENV_MAX_ENTRIES
2835ea882bafSWolfgang Denk
2836ea882bafSWolfgang Denk	Maximum number of entries in the hash table that is used
2837ea882bafSWolfgang Denk	internally to store the environment settings. The default
2838ea882bafSWolfgang Denk	setting is supposed to be generous and should work in most
2839ea882bafSWolfgang Denk	cases. This setting can be used to tune behaviour; see
2840ea882bafSWolfgang Denk	lib/hashtable.c for details.
2841ea882bafSWolfgang Denk
2842c609719bSwdenkThe following definitions that deal with the placement and management
2843c609719bSwdenkof environment data (variable area); in general, we support the
2844c609719bSwdenkfollowing configurations:
2845c609719bSwdenk
2846c3eb3fe4SMike Frysinger- CONFIG_BUILD_ENVCRC:
2847c3eb3fe4SMike Frysinger
2848c3eb3fe4SMike Frysinger	Builds up envcrc with the target environment so that external utils
2849c3eb3fe4SMike Frysinger	may easily extract it and embed it in final U-Boot images.
2850c3eb3fe4SMike Frysinger
28515a1aceb0SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_FLASH:
2852c609719bSwdenk
2853c609719bSwdenk	Define this if the environment is in flash memory.
2854c609719bSwdenk
2855c609719bSwdenk	a) The environment occupies one whole flash sector, which is
2856c609719bSwdenk	   "embedded" in the text segment with the U-Boot code. This
2857c609719bSwdenk	   happens usually with "bottom boot sector" or "top boot
2858c609719bSwdenk	   sector" type flash chips, which have several smaller
2859c609719bSwdenk	   sectors at the start or the end. For instance, such a
2860c609719bSwdenk	   layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In
2861c609719bSwdenk	   such a case you would place the environment in one of the
2862c609719bSwdenk	   4 kB sectors - with U-Boot code before and after it. With
2863c609719bSwdenk	   "top boot sector" type flash chips, you would put the
2864c609719bSwdenk	   environment in one of the last sectors, leaving a gap
2865c609719bSwdenk	   between U-Boot and the environment.
2866c609719bSwdenk
28670e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
2868c609719bSwdenk
2869c609719bSwdenk	   Offset of environment data (variable area) to the
2870c609719bSwdenk	   beginning of flash memory; for instance, with bottom boot
2871c609719bSwdenk	   type flash chips the second sector can be used: the offset
2872c609719bSwdenk	   for this sector is given here.
2873c609719bSwdenk
28746d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	   CONFIG_ENV_OFFSET is used relative to CONFIG_SYS_FLASH_BASE.
2875c609719bSwdenk
28760e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
2877c609719bSwdenk
2878c609719bSwdenk	   This is just another way to specify the start address of
2879c609719bSwdenk	   the flash sector containing the environment (instead of
28800e8d1586SJean-Christophe PLAGNIOL-VILLARD	   CONFIG_ENV_OFFSET).
2881c609719bSwdenk
28820e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SECT_SIZE:
2883c609719bSwdenk
2884c609719bSwdenk	   Size of the sector containing the environment.
2885c609719bSwdenk
2886c609719bSwdenk
2887c609719bSwdenk	b) Sometimes flash chips have few, equal sized, BIG sectors.
2888c609719bSwdenk	   In such a case you don't want to spend a whole sector for
2889c609719bSwdenk	   the environment.
2890c609719bSwdenk
28910e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
2892c609719bSwdenk
28935a1aceb0SJean-Christophe PLAGNIOL-VILLARD	   If you use this in combination with CONFIG_ENV_IS_IN_FLASH
28940e8d1586SJean-Christophe PLAGNIOL-VILLARD	   and CONFIG_ENV_SECT_SIZE, you can specify to use only a part
2895c609719bSwdenk	   of this flash sector for the environment. This saves
2896c609719bSwdenk	   memory for the RAM copy of the environment.
2897c609719bSwdenk
2898c609719bSwdenk	   It may also save flash memory if you decide to use this
2899c609719bSwdenk	   when your environment is "embedded" within U-Boot code,
2900c609719bSwdenk	   since then the remainder of the flash sector could be used
2901c609719bSwdenk	   for U-Boot code. It should be pointed out that this is
2902c609719bSwdenk	   STRONGLY DISCOURAGED from a robustness point of view:
2903c609719bSwdenk	   updating the environment in flash makes it always
2904c609719bSwdenk	   necessary to erase the WHOLE sector. If something goes
2905c609719bSwdenk	   wrong before the contents has been restored from a copy in
2906c609719bSwdenk	   RAM, your target system will be dead.
2907c609719bSwdenk
29080e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR_REDUND
29090e8d1586SJean-Christophe PLAGNIOL-VILLARD	  CONFIG_ENV_SIZE_REDUND
2910c609719bSwdenk
2911c609719bSwdenk	   These settings describe a second storage area used to hold
291211ccc33fSMarcel Ziswiler	   a redundant copy of the environment data, so that there is
29133e38691eSwdenk	   a valid backup copy in case there is a power failure during
2914c609719bSwdenk	   a "saveenv" operation.
2915c609719bSwdenk
2916c609719bSwdenkBE CAREFUL! Any changes to the flash layout, and some changes to the
2917c609719bSwdenksource code will make it necessary to adapt <board>/u-boot.lds*
2918c609719bSwdenkaccordingly!
2919c609719bSwdenk
2920c609719bSwdenk
29219314cee6SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_NVRAM:
2922c609719bSwdenk
2923c609719bSwdenk	Define this if you have some non-volatile memory device
2924c609719bSwdenk	(NVRAM, battery buffered SRAM) which you want to use for the
2925c609719bSwdenk	environment.
2926c609719bSwdenk
29270e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
29280e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
2929c609719bSwdenk
293011ccc33fSMarcel Ziswiler	  These two #defines are used to determine the memory area you
2931c609719bSwdenk	  want to use for environment. It is assumed that this memory
2932c609719bSwdenk	  can just be read and written to, without any special
2933c609719bSwdenk	  provision.
2934c609719bSwdenk
2935c609719bSwdenkBE CAREFUL! The first access to the environment happens quite early
2936c609719bSwdenkin U-Boot initalization (when we try to get the setting of for the
293711ccc33fSMarcel Ziswilerconsole baudrate). You *MUST* have mapped your NVRAM area then, or
2938c609719bSwdenkU-Boot will hang.
2939c609719bSwdenk
2940c609719bSwdenkPlease note that even with NVRAM we still use a copy of the
2941c609719bSwdenkenvironment in RAM: we could work on NVRAM directly, but we want to
2942c609719bSwdenkkeep settings there always unmodified except somebody uses "saveenv"
2943c609719bSwdenkto save the current settings.
2944c609719bSwdenk
2945c609719bSwdenk
2946bb1f8b4fSJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_EEPROM:
2947c609719bSwdenk
2948c609719bSwdenk	Use this if you have an EEPROM or similar serial access
2949c609719bSwdenk	device and a driver for it.
2950c609719bSwdenk
29510e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
29520e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
2953c609719bSwdenk
2954c609719bSwdenk	  These two #defines specify the offset and size of the
2955c609719bSwdenk	  environment area within the total memory of your EEPROM.
2956c609719bSwdenk
29576d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR:
2958c609719bSwdenk	  If defined, specified the chip address of the EEPROM device.
2959c609719bSwdenk	  The default address is zero.
2960c609719bSwdenk
29616d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_PAGE_WRITE_BITS:
2962c609719bSwdenk	  If defined, the number of bits used to address bytes in a
2963c609719bSwdenk	  single page in the EEPROM device.  A 64 byte page, for example
2964c609719bSwdenk	  would require six bits.
2965c609719bSwdenk
29666d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS:
2967c609719bSwdenk	  If defined, the number of milliseconds to delay between
2968c609719bSwdenk	  page writes.	The default is zero milliseconds.
2969c609719bSwdenk
29706d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR_LEN:
2971c609719bSwdenk	  The length in bytes of the EEPROM memory array address.  Note
2972c609719bSwdenk	  that this is NOT the chip address length!
2973c609719bSwdenk
29746d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW:
29755cf91d6bSwdenk	  EEPROM chips that implement "address overflow" are ones
29765cf91d6bSwdenk	  like Catalyst 24WC04/08/16 which has 9/10/11 bits of
29775cf91d6bSwdenk	  address and the extra bits end up in the "chip address" bit
29785cf91d6bSwdenk	  slots. This makes a 24WC08 (1Kbyte) chip look like four 256
29795cf91d6bSwdenk	  byte chips.
29805cf91d6bSwdenk
29815cf91d6bSwdenk	  Note that we consider the length of the address field to
29825cf91d6bSwdenk	  still be one byte because the extra address bits are hidden
29835cf91d6bSwdenk	  in the chip address.
29845cf91d6bSwdenk
29856d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_SIZE:
2986c609719bSwdenk	  The size in bytes of the EEPROM device.
2987c609719bSwdenk
2988548738b4SHeiko Schocher	- CONFIG_ENV_EEPROM_IS_ON_I2C
2989548738b4SHeiko Schocher	  define this, if you have I2C and SPI activated, and your
2990548738b4SHeiko Schocher	  EEPROM, which holds the environment, is on the I2C bus.
2991548738b4SHeiko Schocher
2992548738b4SHeiko Schocher	- CONFIG_I2C_ENV_EEPROM_BUS
2993548738b4SHeiko Schocher	  if you have an Environment on an EEPROM reached over
2994548738b4SHeiko Schocher	  I2C muxes, you can define here, how to reach this
2995548738b4SHeiko Schocher	  EEPROM. For example:
2996548738b4SHeiko Schocher
2997548738b4SHeiko Schocher	  #define CONFIG_I2C_ENV_EEPROM_BUS	  "pca9547:70:d\0"
2998548738b4SHeiko Schocher
2999548738b4SHeiko Schocher	  EEPROM which holds the environment, is reached over
3000548738b4SHeiko Schocher	  a pca9547 i2c mux with address 0x70, channel 3.
3001c609719bSwdenk
3002057c849cSJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_DATAFLASH:
30035779d8d9Swdenk
30045779d8d9Swdenk	Define this if you have a DataFlash memory device which you
30055779d8d9Swdenk	want to use for the environment.
30065779d8d9Swdenk
30070e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
30080e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
30090e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
30105779d8d9Swdenk
30115779d8d9Swdenk	  These three #defines specify the offset and size of the
30125779d8d9Swdenk	  environment area within the total memory of your DataFlash placed
30135779d8d9Swdenk	  at the specified address.
30145779d8d9Swdenk
301551bfee19SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_NAND:
301613a5695bSwdenk
301713a5695bSwdenk	Define this if you have a NAND device which you want to use
301813a5695bSwdenk	for the environment.
301913a5695bSwdenk
30200e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
30210e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
302213a5695bSwdenk
302313a5695bSwdenk	  These two #defines specify the offset and size of the environment
3024fdd813deSScott Wood	  area within the first NAND device.  CONFIG_ENV_OFFSET must be
3025fdd813deSScott Wood	  aligned to an erase block boundary.
30265779d8d9Swdenk
3027fdd813deSScott Wood	- CONFIG_ENV_OFFSET_REDUND (optional):
3028e443c944SMarkus Klotzbuecher
30290e8d1586SJean-Christophe PLAGNIOL-VILLARD	  This setting describes a second storage area of CONFIG_ENV_SIZE
3030fdd813deSScott Wood	  size used to hold a redundant copy of the environment data, so
3031fdd813deSScott Wood	  that there is a valid backup copy in case there is a power failure
3032fdd813deSScott Wood	  during a "saveenv" operation.	 CONFIG_ENV_OFFSET_RENDUND must be
3033fdd813deSScott Wood	  aligned to an erase block boundary.
3034e443c944SMarkus Klotzbuecher
3035fdd813deSScott Wood	- CONFIG_ENV_RANGE (optional):
3036fdd813deSScott Wood
3037fdd813deSScott Wood	  Specifies the length of the region in which the environment
3038fdd813deSScott Wood	  can be written.  This should be a multiple of the NAND device's
3039fdd813deSScott Wood	  block size.  Specifying a range with more erase blocks than
3040fdd813deSScott Wood	  are needed to hold CONFIG_ENV_SIZE allows bad blocks within
3041fdd813deSScott Wood	  the range to be avoided.
3042fdd813deSScott Wood
3043fdd813deSScott Wood	- CONFIG_ENV_OFFSET_OOB (optional):
3044fdd813deSScott Wood
3045fdd813deSScott Wood	  Enables support for dynamically retrieving the offset of the
3046fdd813deSScott Wood	  environment from block zero's out-of-band data.  The
3047fdd813deSScott Wood	  "nand env.oob" command can be used to record this offset.
3048fdd813deSScott Wood	  Currently, CONFIG_ENV_OFFSET_REDUND is not supported when
3049fdd813deSScott Wood	  using CONFIG_ENV_OFFSET_OOB.
3050e443c944SMarkus Klotzbuecher
3051b74ab737SGuennadi Liakhovetski- CONFIG_NAND_ENV_DST
3052b74ab737SGuennadi Liakhovetski
3053b74ab737SGuennadi Liakhovetski	Defines address in RAM to which the nand_spl code should copy the
3054b74ab737SGuennadi Liakhovetski	environment. If redundant environment is used, it will be copied to
3055b74ab737SGuennadi Liakhovetski	CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE.
3056b74ab737SGuennadi Liakhovetski
30576d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPI_INIT_OFFSET
3058c609719bSwdenk
3059c609719bSwdenk	Defines offset to the initial SPI buffer area in DPRAM. The
3060c609719bSwdenk	area is used at an early stage (ROM part) if the environment
3061c609719bSwdenk	is configured to reside in the SPI EEPROM: We need a 520 byte
3062c609719bSwdenk	scratch DPRAM area. It is used between the two initialization
3063c609719bSwdenk	calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems
3064c609719bSwdenk	to be a good choice since it makes it far enough from the
3065c609719bSwdenk	start of the data area as well as from the stack pointer.
3066c609719bSwdenk
3067e881cb56SBruce AdlerPlease note that the environment is read-only until the monitor
3068c609719bSwdenkhas been relocated to RAM and a RAM copy of the environment has been
3069cdb74977SWolfgang Denkcreated; also, when using EEPROM you will have to use getenv_f()
3070c609719bSwdenkuntil then to read environment variables.
3071c609719bSwdenk
307285ec0bccSwdenkThe environment is protected by a CRC32 checksum. Before the monitor
307385ec0bccSwdenkis relocated into RAM, as a result of a bad CRC you will be working
307485ec0bccSwdenkwith the compiled-in default environment - *silently*!!! [This is
307585ec0bccSwdenknecessary, because the first environment variable we need is the
307685ec0bccSwdenk"baudrate" setting for the console - if we have a bad CRC, we don't
307785ec0bccSwdenkhave any device yet where we could complain.]
3078c609719bSwdenk
3079c609719bSwdenkNote: once the monitor has been relocated, then it will complain if
3080c609719bSwdenkthe default environment is used; a new CRC is computed as soon as you
308185ec0bccSwdenkuse the "saveenv" command to store a valid environment.
3082c609719bSwdenk
30836d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FAULT_ECHO_LINK_DOWN:
3084fc3e2165Swdenk		Echo the inverted Ethernet link state to the fault LED.
3085fc3e2165Swdenk
30866d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		Note: If this option is active, then CONFIG_SYS_FAULT_MII_ADDR
3087fc3e2165Swdenk		      also needs to be defined.
3088fc3e2165Swdenk
30896d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FAULT_MII_ADDR:
3090fc3e2165Swdenk		MII address of the PHY to check for the Ethernet link state.
3091c609719bSwdenk
3092f5675aa5SRon Madrid- CONFIG_NS16550_MIN_FUNCTIONS:
3093f5675aa5SRon Madrid		Define this if you desire to only have use of the NS16550_init
3094f5675aa5SRon Madrid		and NS16550_putc functions for the serial driver located at
3095f5675aa5SRon Madrid		drivers/serial/ns16550.c.  This option is useful for saving
3096f5675aa5SRon Madrid		space for already greatly restricted images, including but not
3097f5675aa5SRon Madrid		limited to NAND_SPL configurations.
3098f5675aa5SRon Madrid
3099c609719bSwdenkLow Level (hardware related) configuration options:
3100dc7c9a1aSwdenk---------------------------------------------------
3101c609719bSwdenk
31026d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CACHELINE_SIZE:
3103c609719bSwdenk		Cache Line Size of the CPU.
3104c609719bSwdenk
31056d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DEFAULT_IMMR:
3106c609719bSwdenk		Default address of the IMMR after system reset.
31072535d602Swdenk
31082535d602Swdenk		Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU,
31092535d602Swdenk		and RPXsuper) to be able to adjust the position of
31102535d602Swdenk		the IMMR register after a reset.
3111c609719bSwdenk
3112e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_DEFAULT:
3113e46fedfeSTimur Tabi		Default (power-on reset) physical address of CCSR on Freescale
3114e46fedfeSTimur Tabi		PowerPC SOCs.
3115e46fedfeSTimur Tabi
3116e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR:
3117e46fedfeSTimur Tabi		Virtual address of CCSR.  On a 32-bit build, this is typically
3118e46fedfeSTimur Tabi		the same value as CONFIG_SYS_CCSRBAR_DEFAULT.
3119e46fedfeSTimur Tabi
3120e46fedfeSTimur Tabi		CONFIG_SYS_DEFAULT_IMMR must also be set to this value,
3121e46fedfeSTimur Tabi		for cross-platform code that uses that macro instead.
3122e46fedfeSTimur Tabi
3123e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS:
3124e46fedfeSTimur Tabi		Physical address of CCSR.  CCSR can be relocated to a new
3125e46fedfeSTimur Tabi		physical address, if desired.  In this case, this macro should
3126e46fedfeSTimur Tabi		be set to that address.	 Otherwise, it should be set to the
3127e46fedfeSTimur Tabi		same value as CONFIG_SYS_CCSRBAR_DEFAULT.  For example, CCSR
3128e46fedfeSTimur Tabi		is typically relocated on 36-bit builds.  It is recommended
3129e46fedfeSTimur Tabi		that this macro be defined via the _HIGH and _LOW macros:
3130e46fedfeSTimur Tabi
3131e46fedfeSTimur Tabi		#define CONFIG_SYS_CCSRBAR_PHYS ((CONFIG_SYS_CCSRBAR_PHYS_HIGH
3132e46fedfeSTimur Tabi			* 1ull) << 32 | CONFIG_SYS_CCSRBAR_PHYS_LOW)
3133e46fedfeSTimur Tabi
3134e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS_HIGH:
3135e46fedfeSTimur Tabi		Bits 33-36 of CONFIG_SYS_CCSRBAR_PHYS.	This value is typically
3136e46fedfeSTimur Tabi		either 0 (32-bit build) or 0xF (36-bit build).	This macro is
3137e46fedfeSTimur Tabi		used in assembly code, so it must not contain typecasts or
3138e46fedfeSTimur Tabi		integer size suffixes (e.g. "ULL").
3139e46fedfeSTimur Tabi
3140e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS_LOW:
3141e46fedfeSTimur Tabi		Lower 32-bits of CONFIG_SYS_CCSRBAR_PHYS.  This macro is
3142e46fedfeSTimur Tabi		used in assembly code, so it must not contain typecasts or
3143e46fedfeSTimur Tabi		integer size suffixes (e.g. "ULL").
3144e46fedfeSTimur Tabi
3145e46fedfeSTimur Tabi- CONFIG_SYS_CCSR_DO_NOT_RELOCATE:
3146e46fedfeSTimur Tabi		If this macro is defined, then CONFIG_SYS_CCSRBAR_PHYS will be
3147e46fedfeSTimur Tabi		forced to a value that ensures that CCSR is not relocated.
3148e46fedfeSTimur Tabi
31497f6c2cbcSwdenk- Floppy Disk Support:
31506d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FDC_DRIVE_NUMBER
31517f6c2cbcSwdenk
31527f6c2cbcSwdenk		the default drive number (default value 0)
31537f6c2cbcSwdenk
31546d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_ISA_IO_STRIDE
31557f6c2cbcSwdenk
315611ccc33fSMarcel Ziswiler		defines the spacing between FDC chipset registers
31577f6c2cbcSwdenk		(default value 1)
31587f6c2cbcSwdenk
31596d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_ISA_IO_OFFSET
31607f6c2cbcSwdenk
31617f6c2cbcSwdenk		defines the offset of register from address. It
31627f6c2cbcSwdenk		depends on which part of the data bus is connected to
316311ccc33fSMarcel Ziswiler		the FDC chipset. (default value 0)
31647f6c2cbcSwdenk
31656d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		If CONFIG_SYS_ISA_IO_STRIDE CONFIG_SYS_ISA_IO_OFFSET and
31666d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FDC_DRIVE_NUMBER are undefined, they take their
31677f6c2cbcSwdenk		default value.
31687f6c2cbcSwdenk
31696d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		if CONFIG_SYS_FDC_HW_INIT is defined, then the function
31707f6c2cbcSwdenk		fdc_hw_init() is called at the beginning of the FDC
31717f6c2cbcSwdenk		setup. fdc_hw_init() must be provided by the board
31727f6c2cbcSwdenk		source code. It is used to make hardware dependant
31737f6c2cbcSwdenk		initializations.
31747f6c2cbcSwdenk
31750abddf82SMacpaul Lin- CONFIG_IDE_AHB:
31760abddf82SMacpaul Lin		Most IDE controllers were designed to be connected with PCI
31770abddf82SMacpaul Lin		interface. Only few of them were designed for AHB interface.
31780abddf82SMacpaul Lin		When software is doing ATA command and data transfer to
31790abddf82SMacpaul Lin		IDE devices through IDE-AHB controller, some additional
31800abddf82SMacpaul Lin		registers accessing to these kind of IDE-AHB controller
31810abddf82SMacpaul Lin		is requierd.
31820abddf82SMacpaul Lin
31836d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_IMMR:	Physical address of the Internal Memory.
318425d6712aSwdenk		DO NOT CHANGE unless you know exactly what you're
318525d6712aSwdenk		doing! (11-4) [MPC8xx/82xx systems only]
3186c609719bSwdenk
31876d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_INIT_RAM_ADDR:
3188c609719bSwdenk
31897152b1d0Swdenk		Start address of memory area that can be used for
3190c609719bSwdenk		initial data and stack; please note that this must be
3191c609719bSwdenk		writable memory that is working WITHOUT special
3192c609719bSwdenk		initialization, i. e. you CANNOT use normal RAM which
3193c609719bSwdenk		will become available only after programming the
3194c609719bSwdenk		memory controller and running certain initialization
3195c609719bSwdenk		sequences.
3196c609719bSwdenk
3197c609719bSwdenk		U-Boot uses the following memory types:
3198c609719bSwdenk		- MPC8xx and MPC8260: IMMR (internal memory of the CPU)
3199c609719bSwdenk		- MPC824X: data cache
3200c609719bSwdenk		- PPC4xx:  data cache
3201c609719bSwdenk
32026d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_GBL_DATA_OFFSET:
3203c609719bSwdenk
3204c609719bSwdenk		Offset of the initial data structure in the memory
32056d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		area defined by CONFIG_SYS_INIT_RAM_ADDR. Usually
32066d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_GBL_DATA_OFFSET is chosen such that the initial
3207c609719bSwdenk		data is located at the end of the available space
3208553f0982SWolfgang Denk		(sometimes written as (CONFIG_SYS_INIT_RAM_SIZE -
32096d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_INIT_DATA_SIZE), and the initial stack is just
32106d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		below that area (growing from (CONFIG_SYS_INIT_RAM_ADDR +
32116d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_GBL_DATA_OFFSET) downward.
3212c609719bSwdenk
3213c609719bSwdenk	Note:
3214c609719bSwdenk		On the MPC824X (or other systems that use the data
3215c609719bSwdenk		cache for initial memory) the address chosen for
32166d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_INIT_RAM_ADDR is basically arbitrary - it must
3217c609719bSwdenk		point to an otherwise UNUSED address space between
3218c609719bSwdenk		the top of RAM and the start of the PCI space.
3219c609719bSwdenk
32206d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SIUMCR:	SIU Module Configuration (11-6)
3221c609719bSwdenk
32226d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SYPCR:	System Protection Control (11-9)
3223c609719bSwdenk
32246d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_TBSCR:	Time Base Status and Control (11-26)
3225c609719bSwdenk
32266d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PISCR:	Periodic Interrupt Status and Control (11-31)
3227c609719bSwdenk
32286d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PLPRCR:	PLL, Low-Power, and Reset Control Register (15-30)
3229c609719bSwdenk
32306d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SCCR:	System Clock and reset Control Register (15-27)
3231c609719bSwdenk
32326d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_OR_TIMING_SDRAM:
3233c609719bSwdenk		SDRAM timing
3234c609719bSwdenk
32356d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAMR_PTA:
3236c609719bSwdenk		periodic timer for refresh
3237c609719bSwdenk
32386d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DER:	Debug Event Register (37-47)
3239c609719bSwdenk
32406d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CONFIG_SYS_REMAP_OR_AM,
32416d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PRELIM_OR_AM, CONFIG_SYS_OR_TIMING_FLASH, CONFIG_SYS_OR0_REMAP,
32426d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR0_PRELIM, CONFIG_SYS_BR0_PRELIM, CONFIG_SYS_OR1_REMAP, CONFIG_SYS_OR1_PRELIM,
32436d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_BR1_PRELIM:
3244c609719bSwdenk		Memory Controller Definitions: BR0/1 and OR0/1 (FLASH)
3245c609719bSwdenk
3246c609719bSwdenk- SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE,
32476d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR_TIMING_SDRAM, CONFIG_SYS_OR2_PRELIM, CONFIG_SYS_BR2_PRELIM,
32486d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR3_PRELIM, CONFIG_SYS_BR3_PRELIM:
3249c609719bSwdenk		Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM)
3250c609719bSwdenk
32516d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAMR_PTA, CONFIG_SYS_MPTPR_2BK_4K, CONFIG_SYS_MPTPR_1BK_4K, CONFIG_SYS_MPTPR_2BK_8K,
32526d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_MPTPR_1BK_8K, CONFIG_SYS_MAMR_8COL, CONFIG_SYS_MAMR_9COL:
3253c609719bSwdenk		Machine Mode Register and Memory Periodic Timer
3254c609719bSwdenk		Prescaler definitions (SDRAM timing)
3255c609719bSwdenk
32566d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_I2C_UCODE_PATCH, CONFIG_SYS_I2C_DPMEM_OFFSET [0x1FC0]:
3257c609719bSwdenk		enable I2C microcode relocation patch (MPC8xx);
3258c609719bSwdenk		define relocation offset in DPRAM [DSP2]
3259c609719bSwdenk
32606d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SMC_UCODE_PATCH, CONFIG_SYS_SMC_DPMEM_OFFSET [0x1FC0]:
3261b423d055SHeiko Schocher		enable SMC microcode relocation patch (MPC8xx);
3262b423d055SHeiko Schocher		define relocation offset in DPRAM [SMC1]
3263b423d055SHeiko Schocher
32646d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPI_UCODE_PATCH, CONFIG_SYS_SPI_DPMEM_OFFSET [0x1FC0]:
3265c609719bSwdenk		enable SPI microcode relocation patch (MPC8xx);
3266c609719bSwdenk		define relocation offset in DPRAM [SCC4]
3267c609719bSwdenk
32686d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_USE_OSCCLK:
3269c609719bSwdenk		Use OSCM clock mode on MBX8xx board. Be careful,
3270c609719bSwdenk		wrong setting might damage your board. Read
3271c609719bSwdenk		doc/README.MBX before setting this variable!
3272c609719bSwdenk
32736d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only)
3274ea909b76Swdenk		Offset of the bootmode word in DPRAM used by post
3275ea909b76Swdenk		(Power On Self Tests). This definition overrides
3276ea909b76Swdenk		#define'd default value in commproc.h resp.
3277ea909b76Swdenk		cpm_8260.h.
3278ea909b76Swdenk
32796d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PCI_SLV_MEM_LOCAL, CONFIG_SYS_PCI_SLV_MEM_BUS, CONFIG_SYS_PICMR0_MASK_ATTRIB,
32806d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR0_LOCAL, CONFIG_SYS_PCIMSK0_MASK, CONFIG_SYS_PCI_MSTR1_LOCAL,
32816d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCIMSK1_MASK, CONFIG_SYS_PCI_MSTR_MEM_LOCAL, CONFIG_SYS_PCI_MSTR_MEM_BUS,
32826d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_CPU_PCI_MEM_START, CONFIG_SYS_PCI_MSTR_MEM_SIZE, CONFIG_SYS_POCMR0_MASK_ATTRIB,
32836d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_MEMIO_LOCAL, CONFIG_SYS_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START,
32846d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_MEMIO_SIZE, CONFIG_SYS_POCMR1_MASK_ATTRIB, CONFIG_SYS_PCI_MSTR_IO_LOCAL,
32856d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_IO_BUS, CONFIG_SYS_CPU_PCI_IO_START, CONFIG_SYS_PCI_MSTR_IO_SIZE,
32866d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_POCMR2_MASK_ATTRIB: (MPC826x only)
3287a47a12beSStefan Roese		Overrides the default PCI memory map in arch/powerpc/cpu/mpc8260/pci.c if set.
32885d232d0eSwdenk
32899cacf4fcSDirk Eibach- CONFIG_PCI_DISABLE_PCIE:
32909cacf4fcSDirk Eibach		Disable PCI-Express on systems where it is supported but not
32919cacf4fcSDirk Eibach		required.
32929cacf4fcSDirk Eibach
3293a09b9b68SKumar Gala- CONFIG_SYS_SRIO:
3294a09b9b68SKumar Gala		Chip has SRIO or not
3295a09b9b68SKumar Gala
3296a09b9b68SKumar Gala- CONFIG_SRIO1:
3297a09b9b68SKumar Gala		Board has SRIO 1 port available
3298a09b9b68SKumar Gala
3299a09b9b68SKumar Gala- CONFIG_SRIO2:
3300a09b9b68SKumar Gala		Board has SRIO 2 port available
3301a09b9b68SKumar Gala
3302a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_VIRT:
3303a09b9b68SKumar Gala		Virtual Address of SRIO port 'n' memory region
3304a09b9b68SKumar Gala
3305a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_PHYS:
3306a09b9b68SKumar Gala		Physical Address of SRIO port 'n' memory region
3307a09b9b68SKumar Gala
3308a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_SIZE:
3309a09b9b68SKumar Gala		Size of SRIO port 'n' memory region
3310a09b9b68SKumar Gala
3311eced4626SAlex Waterman- CONFIG_SYS_NDFC_16
3312eced4626SAlex Waterman		Defined to tell the NDFC that the NAND chip is using a
3313eced4626SAlex Waterman		16 bit bus.
3314eced4626SAlex Waterman
3315eced4626SAlex Waterman- CONFIG_SYS_NDFC_EBC0_CFG
3316eced4626SAlex Waterman		Sets the EBC0_CFG register for the NDFC. If not defined
3317eced4626SAlex Waterman		a default value will be used.
3318eced4626SAlex Waterman
3319bb99ad6dSBen Warren- CONFIG_SPD_EEPROM
3320218ca724SWolfgang Denk		Get DDR timing information from an I2C EEPROM. Common
3321218ca724SWolfgang Denk		with pluggable memory modules such as SODIMMs
3322218ca724SWolfgang Denk
3323bb99ad6dSBen Warren  SPD_EEPROM_ADDRESS
3324bb99ad6dSBen Warren		I2C address of the SPD EEPROM
3325bb99ad6dSBen Warren
33266d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPD_BUS_NUM
3327218ca724SWolfgang Denk		If SPD EEPROM is on an I2C bus other than the first
3328218ca724SWolfgang Denk		one, specify here. Note that the value must resolve
3329218ca724SWolfgang Denk		to something your driver can deal with.
3330bb99ad6dSBen Warren
33311b3e3c4fSYork Sun- CONFIG_SYS_DDR_RAW_TIMING
33321b3e3c4fSYork Sun		Get DDR timing information from other than SPD. Common with
33331b3e3c4fSYork Sun		soldered DDR chips onboard without SPD. DDR raw timing
33341b3e3c4fSYork Sun		parameters are extracted from datasheet and hard-coded into
33351b3e3c4fSYork Sun		header files or board specific files.
33361b3e3c4fSYork Sun
33376f5e1dc5SYork Sun- CONFIG_FSL_DDR_INTERACTIVE
33386f5e1dc5SYork Sun		Enable interactive DDR debugging. See doc/README.fsl-ddr.
33396f5e1dc5SYork Sun
33406d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_83XX_DDR_USES_CS0
3341218ca724SWolfgang Denk		Only for 83xx systems. If specified, then DDR should
3342218ca724SWolfgang Denk		be configured using CS0 and CS1 instead of CS2 and CS3.
33432ad6b513STimur Tabi
3344c26e454dSwdenk- CONFIG_ETHER_ON_FEC[12]
3345c26e454dSwdenk		Define to enable FEC[12] on a 8xx series processor.
3346c26e454dSwdenk
3347c26e454dSwdenk- CONFIG_FEC[12]_PHY
3348c26e454dSwdenk		Define to the hardcoded PHY address which corresponds
33496e592385Swdenk		to the given FEC; i. e.
3350c26e454dSwdenk			#define CONFIG_FEC1_PHY 4
3351c26e454dSwdenk		means that the PHY with address 4 is connected to FEC1
3352c26e454dSwdenk
3353c26e454dSwdenk		When set to -1, means to probe for first available.
3354c26e454dSwdenk
3355c26e454dSwdenk- CONFIG_FEC[12]_PHY_NORXERR
3356c26e454dSwdenk		The PHY does not have a RXERR line (RMII only).
3357c26e454dSwdenk		(so program the FEC to ignore it).
3358c26e454dSwdenk
3359c26e454dSwdenk- CONFIG_RMII
3360c26e454dSwdenk		Enable RMII mode for all FECs.
3361c26e454dSwdenk		Note that this is a global option, we can't
3362c26e454dSwdenk		have one FEC in standard MII mode and another in RMII mode.
3363c26e454dSwdenk
33645cf91d6bSwdenk- CONFIG_CRC32_VERIFY
33655cf91d6bSwdenk		Add a verify option to the crc32 command.
33665cf91d6bSwdenk		The syntax is:
33675cf91d6bSwdenk
33685cf91d6bSwdenk		=> crc32 -v <address> <count> <crc32>
33695cf91d6bSwdenk
33705cf91d6bSwdenk		Where address/count indicate a memory area
33715cf91d6bSwdenk		and crc32 is the correct crc32 which the
33725cf91d6bSwdenk		area should have.
33735cf91d6bSwdenk
337456523f12Swdenk- CONFIG_LOOPW
337556523f12Swdenk		Add the "loopw" memory command. This only takes effect if
3376602ad3b3SJon Loeliger		the memory commands are activated globally (CONFIG_CMD_MEM).
337756523f12Swdenk
33787b466641Sstroese- CONFIG_MX_CYCLIC
33797b466641Sstroese		Add the "mdc" and "mwc" memory commands. These are cyclic
33807b466641Sstroese		"md/mw" commands.
33817b466641Sstroese		Examples:
33827b466641Sstroese
33837b466641Sstroese		=> mdc.b 10 4 500
33847b466641Sstroese		This command will print 4 bytes (10,11,12,13) each 500 ms.
33857b466641Sstroese
33867b466641Sstroese		=> mwc.l 100 12345678 10
33877b466641Sstroese		This command will write 12345678 to address 100 all 10 ms.
33887b466641Sstroese
33897b466641Sstroese		This only takes effect if the memory commands are activated
3390602ad3b3SJon Loeliger		globally (CONFIG_CMD_MEM).
33917b466641Sstroese
33928aa1a2d1Swdenk- CONFIG_SKIP_LOWLEVEL_INIT
3393afc1ce82SMacpaul Lin		[ARM, NDS32, MIPS only] If this variable is defined, then certain
3394e03f3169SWolfgang Denk		low level initializations (like setting up the memory
3395e03f3169SWolfgang Denk		controller) are omitted and/or U-Boot does not
3396e03f3169SWolfgang Denk		relocate itself into RAM.
33978aa1a2d1Swdenk
3398e03f3169SWolfgang Denk		Normally this variable MUST NOT be defined. The only
3399e03f3169SWolfgang Denk		exception is when U-Boot is loaded (to RAM) by some
3400e03f3169SWolfgang Denk		other boot loader or by a debugger which performs
3401e03f3169SWolfgang Denk		these initializations itself.
34028aa1a2d1Swdenk
3403401bb30bSAneesh V- CONFIG_SPL_BUILD
3404df81238bSMagnus Lilja		Modifies the behaviour of start.S when compiling a loader
3405df81238bSMagnus Lilja		that is executed before the actual U-Boot. E.g. when
3406df81238bSMagnus Lilja		compiling a NAND SPL.
3407400558b5Swdenk
3408d8834a13SMatthias Weisser- CONFIG_USE_ARCH_MEMCPY
3409d8834a13SMatthias Weisser  CONFIG_USE_ARCH_MEMSET
3410d8834a13SMatthias Weisser		If these options are used a optimized version of memcpy/memset will
3411d8834a13SMatthias Weisser		be used if available. These functions may be faster under some
3412d8834a13SMatthias Weisser		conditions but may increase the binary size.
3413d8834a13SMatthias Weisser
3414f2717b47STimur TabiFreescale QE/FMAN Firmware Support:
3415f2717b47STimur Tabi-----------------------------------
3416f2717b47STimur Tabi
3417f2717b47STimur TabiThe Freescale QUICCEngine (QE) and Frame Manager (FMAN) both support the
3418f2717b47STimur Tabiloading of "firmware", which is encoded in the QE firmware binary format.
3419f2717b47STimur TabiThis firmware often needs to be loaded during U-Boot booting, so macros
3420f2717b47STimur Tabiare used to identify the storage device (NOR flash, SPI, etc) and the address
3421f2717b47STimur Tabiwithin that device.
3422f2717b47STimur Tabi
3423f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_ADDR
3424f2717b47STimur Tabi	The address in the storage device where the firmware is located.  The
3425f2717b47STimur Tabi	meaning of this address depends on which CONFIG_SYS_QE_FW_IN_xxx macro
3426f2717b47STimur Tabi	is also specified.
3427f2717b47STimur Tabi
3428f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_LENGTH
3429f2717b47STimur Tabi	The maximum possible size of the firmware.  The firmware binary format
3430f2717b47STimur Tabi	has a field that specifies the actual size of the firmware, but it
3431f2717b47STimur Tabi	might not be possible to read any part of the firmware unless some
3432f2717b47STimur Tabi	local storage is allocated to hold the entire firmware first.
3433f2717b47STimur Tabi
3434f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_NOR
3435f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located in NOR flash, mapped as
3436f2717b47STimur Tabi	normal addressable memory via the LBC.  CONFIG_SYS_FMAN_FW_ADDR is the
3437f2717b47STimur Tabi	virtual address in NOR flash.
3438f2717b47STimur Tabi
3439f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_NAND
3440f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located in NAND flash.
3441f2717b47STimur Tabi	CONFIG_SYS_FMAN_FW_ADDR is the offset within NAND flash.
3442f2717b47STimur Tabi
3443f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_MMC
3444f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located on the primary SD/MMC
3445f2717b47STimur Tabi	device.  CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device.
3446f2717b47STimur Tabi
3447f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_SPIFLASH
3448f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located on the primary SPI
3449f2717b47STimur Tabi	device.  CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device.
3450f2717b47STimur Tabi
3451f2717b47STimur Tabi
3452c609719bSwdenkBuilding the Software:
3453c609719bSwdenk======================
3454c609719bSwdenk
3455218ca724SWolfgang DenkBuilding U-Boot has been tested in several native build environments
3456218ca724SWolfgang Denkand in many different cross environments. Of course we cannot support
3457218ca724SWolfgang Denkall possibly existing versions of cross development tools in all
3458218ca724SWolfgang Denk(potentially obsolete) versions. In case of tool chain problems we
3459218ca724SWolfgang Denkrecommend to use the ELDK (see http://www.denx.de/wiki/DULG/ELDK)
3460218ca724SWolfgang Denkwhich is extensively used to build and test U-Boot.
3461c609719bSwdenk
3462218ca724SWolfgang DenkIf you are not using a native environment, it is assumed that you
3463218ca724SWolfgang Denkhave GNU cross compiling tools available in your path. In this case,
3464218ca724SWolfgang Denkyou must set the environment variable CROSS_COMPILE in your shell.
3465218ca724SWolfgang DenkNote that no changes to the Makefile or any other source files are
3466218ca724SWolfgang Denknecessary. For example using the ELDK on a 4xx CPU, please enter:
3467c609719bSwdenk
3468218ca724SWolfgang Denk	$ CROSS_COMPILE=ppc_4xx-
3469218ca724SWolfgang Denk	$ export CROSS_COMPILE
3470c609719bSwdenk
34712f8d396bSPeter TyserNote: If you wish to generate Windows versions of the utilities in
34722f8d396bSPeter Tyser      the tools directory you can use the MinGW toolchain
34732f8d396bSPeter Tyser      (http://www.mingw.org).  Set your HOST tools to the MinGW
34742f8d396bSPeter Tyser      toolchain and execute 'make tools'.  For example:
34752f8d396bSPeter Tyser
34762f8d396bSPeter Tyser       $ make HOSTCC=i586-mingw32msvc-gcc HOSTSTRIP=i586-mingw32msvc-strip tools
34772f8d396bSPeter Tyser
34782f8d396bSPeter Tyser      Binaries such as tools/mkimage.exe will be created which can
34792f8d396bSPeter Tyser      be executed on computers running Windows.
34802f8d396bSPeter Tyser
3481c609719bSwdenkU-Boot is intended to be simple to build. After installing the
3482c609719bSwdenksources you must configure U-Boot for one specific board type. This
3483c609719bSwdenkis done by typing:
3484c609719bSwdenk
3485c609719bSwdenk	make NAME_config
3486c609719bSwdenk
3487218ca724SWolfgang Denkwhere "NAME_config" is the name of one of the existing configu-
3488218ca724SWolfgang Denkrations; see the main Makefile for supported names.
348954387ac9Swdenk
3490c609719bSwdenkNote: for some board special configuration names may exist; check if
3491c609719bSwdenk      additional information is available from the board vendor; for
34922729af9dSwdenk      instance, the TQM823L systems are available without (standard)
34932729af9dSwdenk      or with LCD support. You can select such additional "features"
349411ccc33fSMarcel Ziswiler      when choosing the configuration, i. e.
3495c609719bSwdenk
34962729af9dSwdenk      make TQM823L_config
34972729af9dSwdenk	- will configure for a plain TQM823L, i. e. no LCD support
3498c609719bSwdenk
3499c609719bSwdenk      make TQM823L_LCD_config
3500c609719bSwdenk	- will configure for a TQM823L with U-Boot console on LCD
3501c609719bSwdenk
3502c609719bSwdenk      etc.
3503c609719bSwdenk
3504c609719bSwdenk
3505c609719bSwdenkFinally, type "make all", and you should get some working U-Boot
35067152b1d0Swdenkimages ready for download to / installation on your system:
3507c609719bSwdenk
3508c609719bSwdenk- "u-boot.bin" is a raw binary image
3509c609719bSwdenk- "u-boot" is an image in ELF binary format
3510c609719bSwdenk- "u-boot.srec" is in Motorola S-Record format
3511c609719bSwdenk
3512baf31249SMarian BalakowiczBy default the build is performed locally and the objects are saved
3513baf31249SMarian Balakowiczin the source directory. One of the two methods can be used to change
3514baf31249SMarian Balakowiczthis behavior and build U-Boot to some external directory:
3515baf31249SMarian Balakowicz
3516baf31249SMarian Balakowicz1. Add O= to the make command line invocations:
3517baf31249SMarian Balakowicz
3518baf31249SMarian Balakowicz	make O=/tmp/build distclean
3519baf31249SMarian Balakowicz	make O=/tmp/build NAME_config
3520baf31249SMarian Balakowicz	make O=/tmp/build all
3521baf31249SMarian Balakowicz
3522baf31249SMarian Balakowicz2. Set environment variable BUILD_DIR to point to the desired location:
3523baf31249SMarian Balakowicz
3524baf31249SMarian Balakowicz	export BUILD_DIR=/tmp/build
3525baf31249SMarian Balakowicz	make distclean
3526baf31249SMarian Balakowicz	make NAME_config
3527baf31249SMarian Balakowicz	make all
3528baf31249SMarian Balakowicz
3529baf31249SMarian BalakowiczNote that the command line "O=" setting overrides the BUILD_DIR environment
3530baf31249SMarian Balakowiczvariable.
3531baf31249SMarian Balakowicz
3532c609719bSwdenk
3533c609719bSwdenkPlease be aware that the Makefiles assume you are using GNU make, so
3534c609719bSwdenkfor instance on NetBSD you might need to use "gmake" instead of
3535c609719bSwdenknative "make".
3536c609719bSwdenk
3537c609719bSwdenk
3538c609719bSwdenkIf the system board that you have is not listed, then you will need
3539c609719bSwdenkto port U-Boot to your hardware platform. To do this, follow these
3540c609719bSwdenksteps:
3541c609719bSwdenk
3542c609719bSwdenk1.  Add a new configuration option for your board to the toplevel
354385ec0bccSwdenk    "Makefile" and to the "MAKEALL" script, using the existing
354485ec0bccSwdenk    entries as examples. Note that here and at many other places
35457152b1d0Swdenk    boards and other names are listed in alphabetical sort order. Please
354685ec0bccSwdenk    keep this order.
3547c609719bSwdenk2.  Create a new directory to hold your board specific code. Add any
354885ec0bccSwdenk    files you need. In your board directory, you will need at least
354985ec0bccSwdenk    the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds".
355085ec0bccSwdenk3.  Create a new configuration file "include/configs/<board>.h" for
355185ec0bccSwdenk    your board
3552c609719bSwdenk3.  If you're porting U-Boot to a new CPU, then also create a new
3553c609719bSwdenk    directory to hold your CPU specific code. Add any files you need.
355485ec0bccSwdenk4.  Run "make <board>_config" with your new name.
3555c609719bSwdenk5.  Type "make", and you should get a working "u-boot.srec" file
3556c609719bSwdenk    to be installed on your target system.
355785ec0bccSwdenk6.  Debug and solve any problems that might arise.
3558c609719bSwdenk    [Of course, this last step is much harder than it sounds.]
3559c609719bSwdenk
3560c609719bSwdenk
3561c609719bSwdenkTesting of U-Boot Modifications, Ports to New Hardware, etc.:
3562c609719bSwdenk==============================================================
3563c609719bSwdenk
3564c609719bSwdenkIf you have modified U-Boot sources (for instance added a new board
3565c609719bSwdenkor support for new devices, a new CPU, etc.) you are expected to
3566c609719bSwdenkprovide feedback to the other developers. The feedback normally takes
3567c609719bSwdenkthe form of a "patch", i. e. a context diff against a certain (latest
3568218ca724SWolfgang Denkofficial or latest in the git repository) version of U-Boot sources.
3569c609719bSwdenk
3570c609719bSwdenkBut before you submit such a patch, please verify that your modifi-
3571c609719bSwdenkcation did not break existing code. At least make sure that *ALL* of
3572c609719bSwdenkthe supported boards compile WITHOUT ANY compiler warnings. To do so,
3573c609719bSwdenkjust run the "MAKEALL" script, which will configure and build U-Boot
3574c609719bSwdenkfor ALL supported system. Be warned, this will take a while. You can
35757152b1d0Swdenkselect which (cross) compiler to use by passing a `CROSS_COMPILE'
3576218ca724SWolfgang Denkenvironment variable to the script, i. e. to use the ELDK cross tools
3577218ca724SWolfgang Denkyou can type
3578c609719bSwdenk
3579c609719bSwdenk	CROSS_COMPILE=ppc_8xx- MAKEALL
3580c609719bSwdenk
3581c609719bSwdenkor to build on a native PowerPC system you can type
3582c609719bSwdenk
3583c609719bSwdenk	CROSS_COMPILE=' ' MAKEALL
3584c609719bSwdenk
3585218ca724SWolfgang DenkWhen using the MAKEALL script, the default behaviour is to build
3586218ca724SWolfgang DenkU-Boot in the source directory. This location can be changed by
3587218ca724SWolfgang Denksetting the BUILD_DIR environment variable. Also, for each target
3588218ca724SWolfgang Denkbuilt, the MAKEALL script saves two log files (<target>.ERR and
3589218ca724SWolfgang Denk<target>.MAKEALL) in the <source dir>/LOG directory. This default
3590218ca724SWolfgang Denklocation can be changed by setting the MAKEALL_LOGDIR environment
3591218ca724SWolfgang Denkvariable. For example:
3592baf31249SMarian Balakowicz
3593baf31249SMarian Balakowicz	export BUILD_DIR=/tmp/build
3594baf31249SMarian Balakowicz	export MAKEALL_LOGDIR=/tmp/log
3595baf31249SMarian Balakowicz	CROSS_COMPILE=ppc_8xx- MAKEALL
3596baf31249SMarian Balakowicz
3597218ca724SWolfgang DenkWith the above settings build objects are saved in the /tmp/build,
3598218ca724SWolfgang Denklog files are saved in the /tmp/log and the source tree remains clean
3599218ca724SWolfgang Denkduring the whole build process.
3600baf31249SMarian Balakowicz
3601baf31249SMarian Balakowicz
3602c609719bSwdenkSee also "U-Boot Porting Guide" below.
3603c609719bSwdenk
3604c609719bSwdenk
3605c609719bSwdenkMonitor Commands - Overview:
3606c609719bSwdenk============================
3607c609719bSwdenk
3608c609719bSwdenkgo	- start application at address 'addr'
3609c609719bSwdenkrun	- run commands in an environment variable
3610c609719bSwdenkbootm	- boot application image from memory
3611c609719bSwdenkbootp	- boot image via network using BootP/TFTP protocol
361244f074c7SMarek Vasutbootz   - boot zImage from memory
3613c609719bSwdenktftpboot- boot image via network using TFTP protocol
3614c609719bSwdenk	       and env variables "ipaddr" and "serverip"
3615c609719bSwdenk	       (and eventually "gatewayip")
36161fb7cd49SSimon Glasstftpput - upload a file via network using TFTP protocol
3617c609719bSwdenkrarpboot- boot image via network using RARP/TFTP protocol
3618c609719bSwdenkdiskboot- boot from IDE devicebootd   - boot default, i.e., run 'bootcmd'
3619c609719bSwdenkloads	- load S-Record file over serial line
3620c609719bSwdenkloadb	- load binary file over serial line (kermit mode)
3621c609719bSwdenkmd	- memory display
3622c609719bSwdenkmm	- memory modify (auto-incrementing)
3623c609719bSwdenknm	- memory modify (constant address)
3624c609719bSwdenkmw	- memory write (fill)
3625c609719bSwdenkcp	- memory copy
3626c609719bSwdenkcmp	- memory compare
3627c609719bSwdenkcrc32	- checksum calculation
36280f89c54bSPeter Tyseri2c	- I2C sub-system
3629c609719bSwdenksspi	- SPI utility commands
3630c609719bSwdenkbase	- print or set address offset
3631c609719bSwdenkprintenv- print environment variables
3632c609719bSwdenksetenv	- set environment variables
3633c609719bSwdenksaveenv - save environment variables to persistent storage
3634c609719bSwdenkprotect - enable or disable FLASH write protection
3635c609719bSwdenkerase	- erase FLASH memory
3636c609719bSwdenkflinfo	- print FLASH memory information
3637c609719bSwdenkbdinfo	- print Board Info structure
3638c609719bSwdenkiminfo	- print header information for application image
3639c609719bSwdenkconinfo - print console devices and informations
3640c609719bSwdenkide	- IDE sub-system
3641c609719bSwdenkloop	- infinite loop on address range
364256523f12Swdenkloopw	- infinite write loop on address range
3643c609719bSwdenkmtest	- simple RAM test
3644c609719bSwdenkicache	- enable or disable instruction cache
3645c609719bSwdenkdcache	- enable or disable data cache
3646c609719bSwdenkreset	- Perform RESET of the CPU
3647c609719bSwdenkecho	- echo args to console
3648c609719bSwdenkversion - print monitor version
3649c609719bSwdenkhelp	- print online help
3650c609719bSwdenk?	- alias for 'help'
3651c609719bSwdenk
3652c609719bSwdenk
3653c609719bSwdenkMonitor Commands - Detailed Description:
3654c609719bSwdenk========================================
3655c609719bSwdenk
3656c609719bSwdenkTODO.
3657c609719bSwdenk
3658c609719bSwdenkFor now: just type "help <command>".
3659c609719bSwdenk
3660c609719bSwdenk
3661c609719bSwdenkEnvironment Variables:
3662c609719bSwdenk======================
3663c609719bSwdenk
3664c609719bSwdenkU-Boot supports user configuration using Environment Variables which
3665c609719bSwdenkcan be made persistent by saving to Flash memory.
3666c609719bSwdenk
3667c609719bSwdenkEnvironment Variables are set using "setenv", printed using
3668c609719bSwdenk"printenv", and saved to Flash using "saveenv". Using "setenv"
3669c609719bSwdenkwithout a value can be used to delete a variable from the
3670c609719bSwdenkenvironment. As long as you don't save the environment you are
3671c609719bSwdenkworking with an in-memory copy. In case the Flash area containing the
3672c609719bSwdenkenvironment is erased by accident, a default environment is provided.
3673c609719bSwdenk
3674c96f86eeSWolfgang DenkSome configuration options can be set using Environment Variables.
3675c96f86eeSWolfgang Denk
3676c96f86eeSWolfgang DenkList of environment variables (most likely not complete):
3677c609719bSwdenk
3678c609719bSwdenk  baudrate	- see CONFIG_BAUDRATE
3679c609719bSwdenk
3680c609719bSwdenk  bootdelay	- see CONFIG_BOOTDELAY
3681c609719bSwdenk
3682c609719bSwdenk  bootcmd	- see CONFIG_BOOTCOMMAND
3683c609719bSwdenk
3684c609719bSwdenk  bootargs	- Boot arguments when booting an RTOS image
3685c609719bSwdenk
3686c609719bSwdenk  bootfile	- Name of the image to load with TFTP
3687c609719bSwdenk
36887d721e34SBartlomiej Sieka  bootm_low	- Memory range available for image processing in the bootm
36897d721e34SBartlomiej Sieka		  command can be restricted. This variable is given as
36907d721e34SBartlomiej Sieka		  a hexadecimal number and defines lowest address allowed
36917d721e34SBartlomiej Sieka		  for use by the bootm command. See also "bootm_size"
36927d721e34SBartlomiej Sieka		  environment variable. Address defined by "bootm_low" is
36937d721e34SBartlomiej Sieka		  also the base of the initial memory mapping for the Linux
3694c3624e6eSGrant Likely		  kernel -- see the description of CONFIG_SYS_BOOTMAPSZ and
3695c3624e6eSGrant Likely		  bootm_mapsize.
3696c3624e6eSGrant Likely
3697c3624e6eSGrant Likely  bootm_mapsize - Size of the initial memory mapping for the Linux kernel.
3698c3624e6eSGrant Likely		  This variable is given as a hexadecimal number and it
3699c3624e6eSGrant Likely		  defines the size of the memory region starting at base
3700c3624e6eSGrant Likely		  address bootm_low that is accessible by the Linux kernel
3701c3624e6eSGrant Likely		  during early boot.  If unset, CONFIG_SYS_BOOTMAPSZ is used
3702c3624e6eSGrant Likely		  as the default value if it is defined, and bootm_size is
3703c3624e6eSGrant Likely		  used otherwise.
37047d721e34SBartlomiej Sieka
37057d721e34SBartlomiej Sieka  bootm_size	- Memory range available for image processing in the bootm
37067d721e34SBartlomiej Sieka		  command can be restricted. This variable is given as
37077d721e34SBartlomiej Sieka		  a hexadecimal number and defines the size of the region
37087d721e34SBartlomiej Sieka		  allowed for use by the bootm command. See also "bootm_low"
37097d721e34SBartlomiej Sieka		  environment variable.
37107d721e34SBartlomiej Sieka
37114bae9090SBartlomiej Sieka  updatefile	- Location of the software update file on a TFTP server, used
37124bae9090SBartlomiej Sieka		  by the automatic software update feature. Please refer to
37134bae9090SBartlomiej Sieka		  documentation in doc/README.update for more details.
37144bae9090SBartlomiej Sieka
3715c609719bSwdenk  autoload	- if set to "no" (any string beginning with 'n'),
3716c609719bSwdenk		  "bootp" will just load perform a lookup of the
3717c609719bSwdenk		  configuration from the BOOTP server, but not try to
3718c609719bSwdenk		  load any image using TFTP
3719c609719bSwdenk
3720c609719bSwdenk  autostart	- if set to "yes", an image loaded using the "bootp",
3721c609719bSwdenk		  "rarpboot", "tftpboot" or "diskboot" commands will
3722c609719bSwdenk		  be automatically started (by internally calling
3723c609719bSwdenk		  "bootm")
3724c609719bSwdenk
37254a6fd34bSwdenk		  If set to "no", a standalone image passed to the
37264a6fd34bSwdenk		  "bootm" command will be copied to the load address
37274a6fd34bSwdenk		  (and eventually uncompressed), but NOT be started.
37284a6fd34bSwdenk		  This can be used to load and uncompress arbitrary
37294a6fd34bSwdenk		  data.
37304a6fd34bSwdenk
3731a28afca5SDavid A. Long  fdt_high	- if set this restricts the maximum address that the
3732a28afca5SDavid A. Long		  flattened device tree will be copied into upon boot.
3733fa34f6b2SShawn Guo		  For example, if you have a system with 1 GB memory
3734fa34f6b2SShawn Guo		  at physical address 0x10000000, while Linux kernel
3735fa34f6b2SShawn Guo		  only recognizes the first 704 MB as low memory, you
3736fa34f6b2SShawn Guo		  may need to set fdt_high as 0x3C000000 to have the
3737fa34f6b2SShawn Guo		  device tree blob be copied to the maximum address
3738fa34f6b2SShawn Guo		  of the 704 MB low memory, so that Linux kernel can
3739fa34f6b2SShawn Guo		  access it during the boot procedure.
3740fa34f6b2SShawn Guo
3741a28afca5SDavid A. Long		  If this is set to the special value 0xFFFFFFFF then
3742a28afca5SDavid A. Long		  the fdt will not be copied at all on boot.  For this
3743a28afca5SDavid A. Long		  to work it must reside in writable memory, have
3744a28afca5SDavid A. Long		  sufficient padding on the end of it for u-boot to
3745a28afca5SDavid A. Long		  add the information it needs into it, and the memory
3746a28afca5SDavid A. Long		  must be accessible by the kernel.
3747a28afca5SDavid A. Long
3748eea63e05SSimon Glass  fdtcontroladdr- if set this is the address of the control flattened
3749eea63e05SSimon Glass		  device tree used by U-Boot when CONFIG_OF_CONTROL is
3750eea63e05SSimon Glass		  defined.
3751eea63e05SSimon Glass
375217ea1177Swdenk  i2cfast	- (PPC405GP|PPC405EP only)
375317ea1177Swdenk		  if set to 'y' configures Linux I2C driver for fast
375417ea1177Swdenk		  mode (400kHZ). This environment variable is used in
375517ea1177Swdenk		  initialization code. So, for changes to be effective
375617ea1177Swdenk		  it must be saved and board must be reset.
375717ea1177Swdenk
3758c609719bSwdenk  initrd_high	- restrict positioning of initrd images:
3759c609719bSwdenk		  If this variable is not set, initrd images will be
3760c609719bSwdenk		  copied to the highest possible address in RAM; this
3761c609719bSwdenk		  is usually what you want since it allows for
3762c609719bSwdenk		  maximum initrd size. If for some reason you want to
3763c609719bSwdenk		  make sure that the initrd image is loaded below the
37646d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		  CONFIG_SYS_BOOTMAPSZ limit, you can set this environment
3765c609719bSwdenk		  variable to a value of "no" or "off" or "0".
3766c609719bSwdenk		  Alternatively, you can set it to a maximum upper
3767c609719bSwdenk		  address to use (U-Boot will still check that it
3768c609719bSwdenk		  does not overwrite the U-Boot stack and data).
3769c609719bSwdenk
3770c609719bSwdenk		  For instance, when you have a system with 16 MB
37717152b1d0Swdenk		  RAM, and want to reserve 4 MB from use by Linux,
3772c609719bSwdenk		  you can do this by adding "mem=12M" to the value of
3773c609719bSwdenk		  the "bootargs" variable. However, now you must make
37747152b1d0Swdenk		  sure that the initrd image is placed in the first
3775c609719bSwdenk		  12 MB as well - this can be done with
3776c609719bSwdenk
3777c609719bSwdenk		  setenv initrd_high 00c00000
3778c609719bSwdenk
377938b99261Swdenk		  If you set initrd_high to 0xFFFFFFFF, this is an
378038b99261Swdenk		  indication to U-Boot that all addresses are legal
378138b99261Swdenk		  for the Linux kernel, including addresses in flash
378238b99261Swdenk		  memory. In this case U-Boot will NOT COPY the
378338b99261Swdenk		  ramdisk at all. This may be useful to reduce the
378438b99261Swdenk		  boot time on your system, but requires that this
378538b99261Swdenk		  feature is supported by your Linux kernel.
378638b99261Swdenk
3787c609719bSwdenk  ipaddr	- IP address; needed for tftpboot command
3788c609719bSwdenk
3789c609719bSwdenk  loadaddr	- Default load address for commands like "bootp",
3790dc7c9a1aSwdenk		  "rarpboot", "tftpboot", "loadb" or "diskboot"
3791c609719bSwdenk
3792c609719bSwdenk  loads_echo	- see CONFIG_LOADS_ECHO
3793c609719bSwdenk
3794c609719bSwdenk  serverip	- TFTP server IP address; needed for tftpboot command
3795c609719bSwdenk
3796c609719bSwdenk  bootretry	- see CONFIG_BOOT_RETRY_TIME
3797c609719bSwdenk
3798c609719bSwdenk  bootdelaykey	- see CONFIG_AUTOBOOT_DELAY_STR
3799c609719bSwdenk
3800c609719bSwdenk  bootstopkey	- see CONFIG_AUTOBOOT_STOP_STR
3801c609719bSwdenk
3802e2a53458SMike Frysinger  ethprime	- controls which interface is used first.
3803a3d991bdSwdenk
3804e2a53458SMike Frysinger  ethact	- controls which interface is currently active.
3805e2a53458SMike Frysinger		  For example you can do the following
3806a3d991bdSwdenk
380748690d80SHeiko Schocher		  => setenv ethact FEC
380848690d80SHeiko Schocher		  => ping 192.168.0.1 # traffic sent on FEC
380948690d80SHeiko Schocher		  => setenv ethact SCC
381048690d80SHeiko Schocher		  => ping 10.0.0.1 # traffic sent on SCC
3811a3d991bdSwdenk
3812e1692577SMatthias Fuchs  ethrotate	- When set to "no" U-Boot does not go through all
3813e1692577SMatthias Fuchs		  available network interfaces.
3814e1692577SMatthias Fuchs		  It just stays at the currently selected interface.
3815e1692577SMatthias Fuchs
3816a3d991bdSwdenk  netretry	- When set to "no" each network operation will
3817a3d991bdSwdenk		  either succeed or fail without retrying.
38186e592385Swdenk		  When set to "once" the network operation will
38196e592385Swdenk		  fail when all the available network interfaces
38206e592385Swdenk		  are tried once without success.
3821a3d991bdSwdenk		  Useful on scripts which control the retry operation
3822a3d991bdSwdenk		  themselves.
3823a3d991bdSwdenk
3824b4e2f89dSJean-Christophe PLAGNIOL-VILLARD  npe_ucode	- set load address for the NPE microcode
3825a1cf027aSJean-Christophe PLAGNIOL-VILLARD
382628cb9375SWolfgang Denk  tftpsrcport	- If this is set, the value is used for TFTP's
3827ecb0ccd9SWolfgang Denk		  UDP source port.
3828ecb0ccd9SWolfgang Denk
382928cb9375SWolfgang Denk  tftpdstport	- If this is set, the value is used for TFTP's UDP
383028cb9375SWolfgang Denk		  destination port instead of the Well Know Port 69.
383128cb9375SWolfgang Denk
3832c96f86eeSWolfgang Denk  tftpblocksize - Block size to use for TFTP transfers; if not set,
3833c96f86eeSWolfgang Denk		  we use the TFTP server's default block size
3834c96f86eeSWolfgang Denk
3835c96f86eeSWolfgang Denk  tftptimeout	- Retransmission timeout for TFTP packets (in milli-
3836c96f86eeSWolfgang Denk		  seconds, minimum value is 1000 = 1 second). Defines
3837c96f86eeSWolfgang Denk		  when a packet is considered to be lost so it has to
3838c96f86eeSWolfgang Denk		  be retransmitted. The default is 5000 = 5 seconds.
3839c96f86eeSWolfgang Denk		  Lowering this value may make downloads succeed
3840c96f86eeSWolfgang Denk		  faster in networks with high packet loss rates or
3841c96f86eeSWolfgang Denk		  with unreliable TFTP servers.
3842c96f86eeSWolfgang Denk
3843a3d991bdSwdenk  vlan		- When set to a value < 4095 the traffic over
384411ccc33fSMarcel Ziswiler		  Ethernet is encapsulated/received over 802.1q
3845a3d991bdSwdenk		  VLAN tagged frames.
3846c609719bSwdenk
3847dc0b7b0eSJason HobbsThe following image location variables contain the location of images
3848dc0b7b0eSJason Hobbsused in booting. The "Image" column gives the role of the image and is
3849dc0b7b0eSJason Hobbsnot an environment variable name. The other columns are environment
3850dc0b7b0eSJason Hobbsvariable names. "File Name" gives the name of the file on a TFTP
3851dc0b7b0eSJason Hobbsserver, "RAM Address" gives the location in RAM the image will be
3852dc0b7b0eSJason Hobbsloaded to, and "Flash Location" gives the image's address in NOR
3853dc0b7b0eSJason Hobbsflash or offset in NAND flash.
3854dc0b7b0eSJason Hobbs
3855dc0b7b0eSJason Hobbs*Note* - these variables don't have to be defined for all boards, some
3856dc0b7b0eSJason Hobbsboards currenlty use other variables for these purposes, and some
3857dc0b7b0eSJason Hobbsboards use these variables for other purposes.
3858dc0b7b0eSJason Hobbs
3859dc0b7b0eSJason HobbsImage		    File Name	     RAM Address       Flash Location
3860dc0b7b0eSJason Hobbs-----		    ---------	     -----------       --------------
3861dc0b7b0eSJason Hobbsu-boot		    u-boot	     u-boot_addr_r     u-boot_addr
3862dc0b7b0eSJason HobbsLinux kernel	    bootfile	     kernel_addr_r     kernel_addr
3863dc0b7b0eSJason Hobbsdevice tree blob    fdtfile	     fdt_addr_r	       fdt_addr
3864dc0b7b0eSJason Hobbsramdisk		    ramdiskfile	     ramdisk_addr_r    ramdisk_addr
3865dc0b7b0eSJason Hobbs
3866c609719bSwdenkThe following environment variables may be used and automatically
3867c609719bSwdenkupdated by the network boot commands ("bootp" and "rarpboot"),
3868c609719bSwdenkdepending the information provided by your boot server:
3869c609719bSwdenk
3870c609719bSwdenk  bootfile	- see above
3871c609719bSwdenk  dnsip		- IP address of your Domain Name Server
3872fe389a82Sstroese  dnsip2	- IP address of your secondary Domain Name Server
3873c609719bSwdenk  gatewayip	- IP address of the Gateway (Router) to use
3874c609719bSwdenk  hostname	- Target hostname
3875c609719bSwdenk  ipaddr	- see above
3876c609719bSwdenk  netmask	- Subnet Mask
3877c609719bSwdenk  rootpath	- Pathname of the root filesystem on the NFS server
3878c609719bSwdenk  serverip	- see above
3879c609719bSwdenk
3880c609719bSwdenk
3881c609719bSwdenkThere are two special Environment Variables:
3882c609719bSwdenk
3883c609719bSwdenk  serial#	- contains hardware identification information such
3884c609719bSwdenk		  as type string and/or serial number
3885c609719bSwdenk  ethaddr	- Ethernet address
3886c609719bSwdenk
3887c609719bSwdenkThese variables can be set only once (usually during manufacturing of
3888c609719bSwdenkthe board). U-Boot refuses to delete or overwrite these variables
3889c609719bSwdenkonce they have been set once.
3890c609719bSwdenk
3891c609719bSwdenk
3892c1551ea8SstroeseFurther special Environment Variables:
3893c1551ea8Sstroese
3894c1551ea8Sstroese  ver		- Contains the U-Boot version string as printed
3895c1551ea8Sstroese		  with the "version" command. This variable is
3896c1551ea8Sstroese		  readonly (see CONFIG_VERSION_VARIABLE).
3897c1551ea8Sstroese
3898c1551ea8Sstroese
3899c609719bSwdenkPlease note that changes to some configuration parameters may take
3900c609719bSwdenkonly effect after the next boot (yes, that's just like Windoze :-).
3901c609719bSwdenk
3902c609719bSwdenk
3903f07771ccSwdenkCommand Line Parsing:
3904f07771ccSwdenk=====================
3905f07771ccSwdenk
3906f07771ccSwdenkThere are two different command line parsers available with U-Boot:
39077152b1d0Swdenkthe old "simple" one, and the much more powerful "hush" shell:
3908f07771ccSwdenk
3909f07771ccSwdenkOld, simple command line parser:
3910f07771ccSwdenk--------------------------------
3911f07771ccSwdenk
3912f07771ccSwdenk- supports environment variables (through setenv / saveenv commands)
3913f07771ccSwdenk- several commands on one line, separated by ';'
3914fe126d8bSWolfgang Denk- variable substitution using "... ${name} ..." syntax
3915f07771ccSwdenk- special characters ('$', ';') can be escaped by prefixing with '\',
3916f07771ccSwdenk  for example:
3917fe126d8bSWolfgang Denk	setenv bootcmd bootm \${address}
3918f07771ccSwdenk- You can also escape text by enclosing in single apostrophes, for example:
3919f07771ccSwdenk	setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off'
3920f07771ccSwdenk
3921f07771ccSwdenkHush shell:
3922f07771ccSwdenk-----------
3923f07771ccSwdenk
3924f07771ccSwdenk- similar to Bourne shell, with control structures like
3925f07771ccSwdenk  if...then...else...fi, for...do...done; while...do...done,
3926f07771ccSwdenk  until...do...done, ...
3927f07771ccSwdenk- supports environment ("global") variables (through setenv / saveenv
3928f07771ccSwdenk  commands) and local shell variables (through standard shell syntax
3929f07771ccSwdenk  "name=value"); only environment variables can be used with "run"
3930f07771ccSwdenk  command
3931f07771ccSwdenk
3932f07771ccSwdenkGeneral rules:
3933f07771ccSwdenk--------------
3934f07771ccSwdenk
3935f07771ccSwdenk(1) If a command line (or an environment variable executed by a "run"
3936f07771ccSwdenk    command) contains several commands separated by semicolon, and
3937f07771ccSwdenk    one of these commands fails, then the remaining commands will be
3938f07771ccSwdenk    executed anyway.
3939f07771ccSwdenk
3940f07771ccSwdenk(2) If you execute several variables with one call to run (i. e.
394111ccc33fSMarcel Ziswiler    calling run with a list of variables as arguments), any failing
3942f07771ccSwdenk    command will cause "run" to terminate, i. e. the remaining
3943f07771ccSwdenk    variables are not executed.
3944f07771ccSwdenk
3945c609719bSwdenkNote for Redundant Ethernet Interfaces:
3946c609719bSwdenk=======================================
3947c609719bSwdenk
394811ccc33fSMarcel ZiswilerSome boards come with redundant Ethernet interfaces; U-Boot supports
3949c609719bSwdenksuch configurations and is capable of automatic selection of a
39507152b1d0Swdenk"working" interface when needed. MAC assignment works as follows:
3951c609719bSwdenk
3952c609719bSwdenkNetwork interfaces are numbered eth0, eth1, eth2, ... Corresponding
3953c609719bSwdenkMAC addresses can be stored in the environment as "ethaddr" (=>eth0),
3954c609719bSwdenk"eth1addr" (=>eth1), "eth2addr", ...
3955c609719bSwdenk
3956c609719bSwdenkIf the network interface stores some valid MAC address (for instance
3957c609719bSwdenkin SROM), this is used as default address if there is NO correspon-
3958c609719bSwdenkding setting in the environment; if the corresponding environment
3959c609719bSwdenkvariable is set, this overrides the settings in the card; that means:
3960c609719bSwdenk
3961c609719bSwdenko If the SROM has a valid MAC address, and there is no address in the
3962c609719bSwdenk  environment, the SROM's address is used.
3963c609719bSwdenk
3964c609719bSwdenko If there is no valid address in the SROM, and a definition in the
3965c609719bSwdenk  environment exists, then the value from the environment variable is
3966c609719bSwdenk  used.
3967c609719bSwdenk
3968c609719bSwdenko If both the SROM and the environment contain a MAC address, and
3969c609719bSwdenk  both addresses are the same, this MAC address is used.
3970c609719bSwdenk
3971c609719bSwdenko If both the SROM and the environment contain a MAC address, and the
3972c609719bSwdenk  addresses differ, the value from the environment is used and a
3973c609719bSwdenk  warning is printed.
3974c609719bSwdenk
3975c609719bSwdenko If neither SROM nor the environment contain a MAC address, an error
3976c609719bSwdenk  is raised.
3977c609719bSwdenk
3978ecee9324SBen WarrenIf Ethernet drivers implement the 'write_hwaddr' function, valid MAC addresses
3979ecee9324SBen Warrenwill be programmed into hardware as part of the initialization process.	 This
3980ecee9324SBen Warrenmay be skipped by setting the appropriate 'ethmacskip' environment variable.
3981ecee9324SBen WarrenThe naming convention is as follows:
3982ecee9324SBen Warren"ethmacskip" (=>eth0), "eth1macskip" (=>eth1) etc.
3983c609719bSwdenk
3984c609719bSwdenkImage Formats:
3985c609719bSwdenk==============
3986c609719bSwdenk
39873310c549SMarian BalakowiczU-Boot is capable of booting (and performing other auxiliary operations on)
39883310c549SMarian Balakowiczimages in two formats:
39893310c549SMarian Balakowicz
39903310c549SMarian BalakowiczNew uImage format (FIT)
39913310c549SMarian Balakowicz-----------------------
39923310c549SMarian Balakowicz
39933310c549SMarian BalakowiczFlexible and powerful format based on Flattened Image Tree -- FIT (similar
39943310c549SMarian Balakowiczto Flattened Device Tree). It allows the use of images with multiple
39953310c549SMarian Balakowiczcomponents (several kernels, ramdisks, etc.), with contents protected by
39963310c549SMarian BalakowiczSHA1, MD5 or CRC32. More details are found in the doc/uImage.FIT directory.
39973310c549SMarian Balakowicz
39983310c549SMarian Balakowicz
39993310c549SMarian BalakowiczOld uImage format
40003310c549SMarian Balakowicz-----------------
40013310c549SMarian Balakowicz
40023310c549SMarian BalakowiczOld image format is based on binary files which can be basically anything,
40033310c549SMarian Balakowiczpreceded by a special header; see the definitions in include/image.h for
40043310c549SMarian Balakowiczdetails; basically, the header defines the following image properties:
4005c609719bSwdenk
4006c609719bSwdenk* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD,
4007c609719bSwdenk  4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks,
4008f5ed9e39SPeter Tyser  LynxOS, pSOS, QNX, RTEMS, INTEGRITY;
4009f5ed9e39SPeter Tyser  Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, LynxOS,
4010f5ed9e39SPeter Tyser  INTEGRITY).
40117b64fef3SWolfgang Denk* Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86,
4012afc1ce82SMacpaul Lin  IA64, MIPS, NDS32, Nios II, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit;
4013afc1ce82SMacpaul Lin  Currently supported: ARM, AVR32, Intel x86, MIPS, NDS32, Nios II, PowerPC).
4014c29fdfc1Swdenk* Compression Type (uncompressed, gzip, bzip2)
4015c609719bSwdenk* Load Address
4016c609719bSwdenk* Entry Point
4017c609719bSwdenk* Image Name
4018c609719bSwdenk* Image Timestamp
4019c609719bSwdenk
4020c609719bSwdenkThe header is marked by a special Magic Number, and both the header
4021c609719bSwdenkand the data portions of the image are secured against corruption by
4022c609719bSwdenkCRC32 checksums.
4023c609719bSwdenk
4024c609719bSwdenk
4025c609719bSwdenkLinux Support:
4026c609719bSwdenk==============
4027c609719bSwdenk
4028c609719bSwdenkAlthough U-Boot should support any OS or standalone application
40297152b1d0Swdenkeasily, the main focus has always been on Linux during the design of
4030c609719bSwdenkU-Boot.
4031c609719bSwdenk
4032c609719bSwdenkU-Boot includes many features that so far have been part of some
4033c609719bSwdenkspecial "boot loader" code within the Linux kernel. Also, any
4034c609719bSwdenk"initrd" images to be used are no longer part of one big Linux image;
4035c609719bSwdenkinstead, kernel and "initrd" are separate images. This implementation
40367152b1d0Swdenkserves several purposes:
4037c609719bSwdenk
4038c609719bSwdenk- the same features can be used for other OS or standalone
4039c609719bSwdenk  applications (for instance: using compressed images to reduce the
4040c609719bSwdenk  Flash memory footprint)
4041c609719bSwdenk
4042c609719bSwdenk- it becomes much easier to port new Linux kernel versions because
40437152b1d0Swdenk  lots of low-level, hardware dependent stuff are done by U-Boot
4044c609719bSwdenk
4045c609719bSwdenk- the same Linux kernel image can now be used with different "initrd"
4046c609719bSwdenk  images; of course this also means that different kernel images can
4047c609719bSwdenk  be run with the same "initrd". This makes testing easier (you don't
4048c609719bSwdenk  have to build a new "zImage.initrd" Linux image when you just
4049c609719bSwdenk  change a file in your "initrd"). Also, a field-upgrade of the
4050c609719bSwdenk  software is easier now.
4051c609719bSwdenk
4052c609719bSwdenk
4053c609719bSwdenkLinux HOWTO:
4054c609719bSwdenk============
4055c609719bSwdenk
4056c609719bSwdenkPorting Linux to U-Boot based systems:
4057c609719bSwdenk---------------------------------------
4058c609719bSwdenk
4059c609719bSwdenkU-Boot cannot save you from doing all the necessary modifications to
4060c609719bSwdenkconfigure the Linux device drivers for use with your target hardware
4061c609719bSwdenk(no, we don't intend to provide a full virtual machine interface to
4062c609719bSwdenkLinux :-).
4063c609719bSwdenk
4064a47a12beSStefan RoeseBut now you can ignore ALL boot loader code (in arch/powerpc/mbxboot).
4065c609719bSwdenk
4066c609719bSwdenkJust make sure your machine specific header file (for instance
4067c609719bSwdenkinclude/asm-ppc/tqm8xx.h) includes the same definition of the Board
40681dc30693SMarkus HeidelbergInformation structure as we define in include/asm-<arch>/u-boot.h,
40691dc30693SMarkus Heidelbergand make sure that your definition of IMAP_ADDR uses the same value
40706d0f6bcfSJean-Christophe PLAGNIOL-VILLARDas your U-Boot configuration in CONFIG_SYS_IMMR.
4071c609719bSwdenk
4072c609719bSwdenk
4073c609719bSwdenkConfiguring the Linux kernel:
4074c609719bSwdenk-----------------------------
4075c609719bSwdenk
4076c609719bSwdenkNo specific requirements for U-Boot. Make sure you have some root
4077c609719bSwdenkdevice (initial ramdisk, NFS) for your target system.
4078c609719bSwdenk
4079c609719bSwdenk
4080c609719bSwdenkBuilding a Linux Image:
4081c609719bSwdenk-----------------------
4082c609719bSwdenk
408324ee89b9SwdenkWith U-Boot, "normal" build targets like "zImage" or "bzImage" are
408424ee89b9Swdenknot used. If you use recent kernel source, a new build target
408524ee89b9Swdenk"uImage" will exist which automatically builds an image usable by
408624ee89b9SwdenkU-Boot. Most older kernels also have support for a "pImage" target,
408724ee89b9Swdenkwhich was introduced for our predecessor project PPCBoot and uses a
408824ee89b9Swdenk100% compatible format.
4089c609719bSwdenk
4090c609719bSwdenkExample:
4091c609719bSwdenk
4092c609719bSwdenk	make TQM850L_config
4093c609719bSwdenk	make oldconfig
4094c609719bSwdenk	make dep
409524ee89b9Swdenk	make uImage
4096c609719bSwdenk
409724ee89b9SwdenkThe "uImage" build target uses a special tool (in 'tools/mkimage') to
409824ee89b9Swdenkencapsulate a compressed Linux kernel image with header	 information,
409924ee89b9SwdenkCRC32 checksum etc. for use with U-Boot. This is what we are doing:
4100c609719bSwdenk
410124ee89b9Swdenk* build a standard "vmlinux" kernel image (in ELF binary format):
410224ee89b9Swdenk
410324ee89b9Swdenk* convert the kernel into a raw binary image:
410424ee89b9Swdenk
410524ee89b9Swdenk	${CROSS_COMPILE}-objcopy -O binary \
410624ee89b9Swdenk				 -R .note -R .comment \
410724ee89b9Swdenk				 -S vmlinux linux.bin
410824ee89b9Swdenk
410924ee89b9Swdenk* compress the binary image:
411024ee89b9Swdenk
411124ee89b9Swdenk	gzip -9 linux.bin
411224ee89b9Swdenk
411324ee89b9Swdenk* package compressed binary image for U-Boot:
411424ee89b9Swdenk
411524ee89b9Swdenk	mkimage -A ppc -O linux -T kernel -C gzip \
411624ee89b9Swdenk		-a 0 -e 0 -n "Linux Kernel Image" \
411724ee89b9Swdenk		-d linux.bin.gz uImage
411824ee89b9Swdenk
411924ee89b9Swdenk
412024ee89b9SwdenkThe "mkimage" tool can also be used to create ramdisk images for use
412124ee89b9Swdenkwith U-Boot, either separated from the Linux kernel image, or
412224ee89b9Swdenkcombined into one file. "mkimage" encapsulates the images with a 64
412324ee89b9Swdenkbyte header containing information about target architecture,
412424ee89b9Swdenkoperating system, image type, compression method, entry points, time
412524ee89b9Swdenkstamp, CRC32 checksums, etc.
412624ee89b9Swdenk
412724ee89b9Swdenk"mkimage" can be called in two ways: to verify existing images and
412824ee89b9Swdenkprint the header information, or to build new images.
4129c609719bSwdenk
4130c609719bSwdenkIn the first form (with "-l" option) mkimage lists the information
4131c609719bSwdenkcontained in the header of an existing U-Boot image; this includes
4132c609719bSwdenkchecksum verification:
4133c609719bSwdenk
4134c609719bSwdenk	tools/mkimage -l image
4135c609719bSwdenk	  -l ==> list image header information
4136c609719bSwdenk
4137c609719bSwdenkThe second form (with "-d" option) is used to build a U-Boot image
4138c609719bSwdenkfrom a "data file" which is used as image payload:
4139c609719bSwdenk
4140c609719bSwdenk	tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \
4141c609719bSwdenk		      -n name -d data_file image
4142c609719bSwdenk	  -A ==> set architecture to 'arch'
4143c609719bSwdenk	  -O ==> set operating system to 'os'
4144c609719bSwdenk	  -T ==> set image type to 'type'
4145c609719bSwdenk	  -C ==> set compression type 'comp'
4146c609719bSwdenk	  -a ==> set load address to 'addr' (hex)
4147c609719bSwdenk	  -e ==> set entry point to 'ep' (hex)
4148c609719bSwdenk	  -n ==> set image name to 'name'
4149c609719bSwdenk	  -d ==> use image data from 'datafile'
4150c609719bSwdenk
415169459791SwdenkRight now, all Linux kernels for PowerPC systems use the same load
415269459791Swdenkaddress (0x00000000), but the entry point address depends on the
415369459791Swdenkkernel version:
4154c609719bSwdenk
4155c609719bSwdenk- 2.2.x kernels have the entry point at 0x0000000C,
415624ee89b9Swdenk- 2.3.x and later kernels have the entry point at 0x00000000.
4157c609719bSwdenk
4158c609719bSwdenkSo a typical call to build a U-Boot image would read:
4159c609719bSwdenk
416024ee89b9Swdenk	-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
416124ee89b9Swdenk	> -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \
4162a47a12beSStefan Roese	> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz \
416324ee89b9Swdenk	> examples/uImage.TQM850L
416424ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
4165c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
4166c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (gzip compressed)
4167c609719bSwdenk	Data Size:    335725 Bytes = 327.86 kB = 0.32 MB
4168c609719bSwdenk	Load Address: 0x00000000
416924ee89b9Swdenk	Entry Point:  0x00000000
4170c609719bSwdenk
4171c609719bSwdenkTo verify the contents of the image (or check for corruption):
4172c609719bSwdenk
417324ee89b9Swdenk	-> tools/mkimage -l examples/uImage.TQM850L
417424ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
4175c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
4176c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (gzip compressed)
4177c609719bSwdenk	Data Size:    335725 Bytes = 327.86 kB = 0.32 MB
4178c609719bSwdenk	Load Address: 0x00000000
417924ee89b9Swdenk	Entry Point:  0x00000000
4180c609719bSwdenk
4181c609719bSwdenkNOTE: for embedded systems where boot time is critical you can trade
4182c609719bSwdenkspeed for memory and install an UNCOMPRESSED image instead: this
4183c609719bSwdenkneeds more space in Flash, but boots much faster since it does not
4184c609719bSwdenkneed to be uncompressed:
4185c609719bSwdenk
4186a47a12beSStefan Roese	-> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz
418724ee89b9Swdenk	-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
418824ee89b9Swdenk	> -A ppc -O linux -T kernel -C none -a 0 -e 0 \
4189a47a12beSStefan Roese	> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux \
419024ee89b9Swdenk	> examples/uImage.TQM850L-uncompressed
419124ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
4192c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
4193c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (uncompressed)
4194c609719bSwdenk	Data Size:    792160 Bytes = 773.59 kB = 0.76 MB
4195c609719bSwdenk	Load Address: 0x00000000
419624ee89b9Swdenk	Entry Point:  0x00000000
4197c609719bSwdenk
4198c609719bSwdenk
4199c609719bSwdenkSimilar you can build U-Boot images from a 'ramdisk.image.gz' file
4200c609719bSwdenkwhen your kernel is intended to use an initial ramdisk:
4201c609719bSwdenk
4202c609719bSwdenk	-> tools/mkimage -n 'Simple Ramdisk Image' \
4203c609719bSwdenk	> -A ppc -O linux -T ramdisk -C gzip \
4204c609719bSwdenk	> -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd
4205c609719bSwdenk	Image Name:   Simple Ramdisk Image
4206c609719bSwdenk	Created:      Wed Jan 12 14:01:50 2000
4207c609719bSwdenk	Image Type:   PowerPC Linux RAMDisk Image (gzip compressed)
4208c609719bSwdenk	Data Size:    566530 Bytes = 553.25 kB = 0.54 MB
4209c609719bSwdenk	Load Address: 0x00000000
4210c609719bSwdenk	Entry Point:  0x00000000
4211c609719bSwdenk
4212c609719bSwdenk
4213c609719bSwdenkInstalling a Linux Image:
4214c609719bSwdenk-------------------------
4215c609719bSwdenk
4216c609719bSwdenkTo downloading a U-Boot image over the serial (console) interface,
4217c609719bSwdenkyou must convert the image to S-Record format:
4218c609719bSwdenk
4219c609719bSwdenk	objcopy -I binary -O srec examples/image examples/image.srec
4220c609719bSwdenk
4221c609719bSwdenkThe 'objcopy' does not understand the information in the U-Boot
4222c609719bSwdenkimage header, so the resulting S-Record file will be relative to
4223c609719bSwdenkaddress 0x00000000. To load it to a given address, you need to
4224c609719bSwdenkspecify the target address as 'offset' parameter with the 'loads'
4225c609719bSwdenkcommand.
4226c609719bSwdenk
4227c609719bSwdenkExample: install the image to address 0x40100000 (which on the
4228c609719bSwdenkTQM8xxL is in the first Flash bank):
4229c609719bSwdenk
4230c609719bSwdenk	=> erase 40100000 401FFFFF
4231c609719bSwdenk
4232c609719bSwdenk	.......... done
4233c609719bSwdenk	Erased 8 sectors
4234c609719bSwdenk
4235c609719bSwdenk	=> loads 40100000
4236c609719bSwdenk	## Ready for S-Record download ...
4237c609719bSwdenk	~>examples/image.srec
4238c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 12 13 ...
4239c609719bSwdenk	...
4240c609719bSwdenk	15989 15990 15991 15992
4241c609719bSwdenk	[file transfer complete]
4242c609719bSwdenk	[connected]
4243c609719bSwdenk	## Start Addr = 0x00000000
4244c609719bSwdenk
4245c609719bSwdenk
4246c609719bSwdenkYou can check the success of the download using the 'iminfo' command;
4247c609719bSwdenkthis includes a checksum verification so you can be sure no data
4248c609719bSwdenkcorruption happened:
4249c609719bSwdenk
4250c609719bSwdenk	=> imi 40100000
4251c609719bSwdenk
4252c609719bSwdenk	## Checking Image at 40100000 ...
4253c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
4254c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
4255c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
4256c609719bSwdenk	   Load Address: 00000000
4257c609719bSwdenk	   Entry Point:	 0000000c
4258c609719bSwdenk	   Verifying Checksum ... OK
4259c609719bSwdenk
4260c609719bSwdenk
4261c609719bSwdenkBoot Linux:
4262c609719bSwdenk-----------
4263c609719bSwdenk
4264c609719bSwdenkThe "bootm" command is used to boot an application that is stored in
4265c609719bSwdenkmemory (RAM or Flash). In case of a Linux kernel image, the contents
4266c609719bSwdenkof the "bootargs" environment variable is passed to the kernel as
4267c609719bSwdenkparameters. You can check and modify this variable using the
4268c609719bSwdenk"printenv" and "setenv" commands:
4269c609719bSwdenk
4270c609719bSwdenk
4271c609719bSwdenk	=> printenv bootargs
4272c609719bSwdenk	bootargs=root=/dev/ram
4273c609719bSwdenk
4274c609719bSwdenk	=> setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
4275c609719bSwdenk
4276c609719bSwdenk	=> printenv bootargs
4277c609719bSwdenk	bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
4278c609719bSwdenk
4279c609719bSwdenk	=> bootm 40020000
4280c609719bSwdenk	## Booting Linux kernel at 40020000 ...
4281c609719bSwdenk	   Image Name:	 2.2.13 for NFS on TQM850L
4282c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
4283c609719bSwdenk	   Data Size:	 381681 Bytes = 372 kB = 0 MB
4284c609719bSwdenk	   Load Address: 00000000
4285c609719bSwdenk	   Entry Point:	 0000000c
4286c609719bSwdenk	   Verifying Checksum ... OK
4287c609719bSwdenk	   Uncompressing Kernel Image ... OK
4288c609719bSwdenk	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
4289c609719bSwdenk	Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
4290c609719bSwdenk	time_init: decrementer frequency = 187500000/60
4291c609719bSwdenk	Calibrating delay loop... 49.77 BogoMIPS
4292c609719bSwdenk	Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000]
4293c609719bSwdenk	...
4294c609719bSwdenk
429511ccc33fSMarcel ZiswilerIf you want to boot a Linux kernel with initial RAM disk, you pass
42967152b1d0Swdenkthe memory addresses of both the kernel and the initrd image (PPBCOOT
4297c609719bSwdenkformat!) to the "bootm" command:
4298c609719bSwdenk
4299c609719bSwdenk	=> imi 40100000 40200000
4300c609719bSwdenk
4301c609719bSwdenk	## Checking Image at 40100000 ...
4302c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
4303c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
4304c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
4305c609719bSwdenk	   Load Address: 00000000
4306c609719bSwdenk	   Entry Point:	 0000000c
4307c609719bSwdenk	   Verifying Checksum ... OK
4308c609719bSwdenk
4309c609719bSwdenk	## Checking Image at 40200000 ...
4310c609719bSwdenk	   Image Name:	 Simple Ramdisk Image
4311c609719bSwdenk	   Image Type:	 PowerPC Linux RAMDisk Image (gzip compressed)
4312c609719bSwdenk	   Data Size:	 566530 Bytes = 553 kB = 0 MB
4313c609719bSwdenk	   Load Address: 00000000
4314c609719bSwdenk	   Entry Point:	 00000000
4315c609719bSwdenk	   Verifying Checksum ... OK
4316c609719bSwdenk
4317c609719bSwdenk	=> bootm 40100000 40200000
4318c609719bSwdenk	## Booting Linux kernel at 40100000 ...
4319c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
4320c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
4321c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
4322c609719bSwdenk	   Load Address: 00000000
4323c609719bSwdenk	   Entry Point:	 0000000c
4324c609719bSwdenk	   Verifying Checksum ... OK
4325c609719bSwdenk	   Uncompressing Kernel Image ... OK
4326c609719bSwdenk	## Loading RAMDisk Image at 40200000 ...
4327c609719bSwdenk	   Image Name:	 Simple Ramdisk Image
4328c609719bSwdenk	   Image Type:	 PowerPC Linux RAMDisk Image (gzip compressed)
4329c609719bSwdenk	   Data Size:	 566530 Bytes = 553 kB = 0 MB
4330c609719bSwdenk	   Load Address: 00000000
4331c609719bSwdenk	   Entry Point:	 00000000
4332c609719bSwdenk	   Verifying Checksum ... OK
4333c609719bSwdenk	   Loading Ramdisk ... OK
4334c609719bSwdenk	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
4335c609719bSwdenk	Boot arguments: root=/dev/ram
4336c609719bSwdenk	time_init: decrementer frequency = 187500000/60
4337c609719bSwdenk	Calibrating delay loop... 49.77 BogoMIPS
4338c609719bSwdenk	...
4339c609719bSwdenk	RAMDISK: Compressed image found at block 0
4340c609719bSwdenk	VFS: Mounted root (ext2 filesystem).
4341c609719bSwdenk
4342c609719bSwdenk	bash#
4343c609719bSwdenk
43440267768eSMatthew McClintockBoot Linux and pass a flat device tree:
43450267768eSMatthew McClintock-----------
43460267768eSMatthew McClintock
43470267768eSMatthew McClintockFirst, U-Boot must be compiled with the appropriate defines. See the section
43480267768eSMatthew McClintocktitled "Linux Kernel Interface" above for a more in depth explanation. The
43490267768eSMatthew McClintockfollowing is an example of how to start a kernel and pass an updated
43500267768eSMatthew McClintockflat device tree:
43510267768eSMatthew McClintock
43520267768eSMatthew McClintock=> print oftaddr
43530267768eSMatthew McClintockoftaddr=0x300000
43540267768eSMatthew McClintock=> print oft
43550267768eSMatthew McClintockoft=oftrees/mpc8540ads.dtb
43560267768eSMatthew McClintock=> tftp $oftaddr $oft
43570267768eSMatthew McClintockSpeed: 1000, full duplex
43580267768eSMatthew McClintockUsing TSEC0 device
43590267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.101
43600267768eSMatthew McClintockFilename 'oftrees/mpc8540ads.dtb'.
43610267768eSMatthew McClintockLoad address: 0x300000
43620267768eSMatthew McClintockLoading: #
43630267768eSMatthew McClintockdone
43640267768eSMatthew McClintockBytes transferred = 4106 (100a hex)
43650267768eSMatthew McClintock=> tftp $loadaddr $bootfile
43660267768eSMatthew McClintockSpeed: 1000, full duplex
43670267768eSMatthew McClintockUsing TSEC0 device
43680267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.2
43690267768eSMatthew McClintockFilename 'uImage'.
43700267768eSMatthew McClintockLoad address: 0x200000
43710267768eSMatthew McClintockLoading:############
43720267768eSMatthew McClintockdone
43730267768eSMatthew McClintockBytes transferred = 1029407 (fb51f hex)
43740267768eSMatthew McClintock=> print loadaddr
43750267768eSMatthew McClintockloadaddr=200000
43760267768eSMatthew McClintock=> print oftaddr
43770267768eSMatthew McClintockoftaddr=0x300000
43780267768eSMatthew McClintock=> bootm $loadaddr - $oftaddr
43790267768eSMatthew McClintock## Booting image at 00200000 ...
43800267768eSMatthew McClintock   Image Name:	 Linux-2.6.17-dirty
43810267768eSMatthew McClintock   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
43820267768eSMatthew McClintock   Data Size:	 1029343 Bytes = 1005.2 kB
43830267768eSMatthew McClintock   Load Address: 00000000
43840267768eSMatthew McClintock   Entry Point:	 00000000
43850267768eSMatthew McClintock   Verifying Checksum ... OK
43860267768eSMatthew McClintock   Uncompressing Kernel Image ... OK
43870267768eSMatthew McClintockBooting using flat device tree at 0x300000
43880267768eSMatthew McClintockUsing MPC85xx ADS machine description
43890267768eSMatthew McClintockMemory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb
43900267768eSMatthew McClintock[snip]
43910267768eSMatthew McClintock
43920267768eSMatthew McClintock
43936069ff26SwdenkMore About U-Boot Image Types:
43946069ff26Swdenk------------------------------
43956069ff26Swdenk
43966069ff26SwdenkU-Boot supports the following image types:
43976069ff26Swdenk
43986069ff26Swdenk   "Standalone Programs" are directly runnable in the environment
43996069ff26Swdenk	provided by U-Boot; it is expected that (if they behave
44006069ff26Swdenk	well) you can continue to work in U-Boot after return from
44016069ff26Swdenk	the Standalone Program.
44026069ff26Swdenk   "OS Kernel Images" are usually images of some Embedded OS which
44036069ff26Swdenk	will take over control completely. Usually these programs
44046069ff26Swdenk	will install their own set of exception handlers, device
44056069ff26Swdenk	drivers, set up the MMU, etc. - this means, that you cannot
44066069ff26Swdenk	expect to re-enter U-Boot except by resetting the CPU.
44076069ff26Swdenk   "RAMDisk Images" are more or less just data blocks, and their
44086069ff26Swdenk	parameters (address, size) are passed to an OS kernel that is
44096069ff26Swdenk	being started.
44106069ff26Swdenk   "Multi-File Images" contain several images, typically an OS
44116069ff26Swdenk	(Linux) kernel image and one or more data images like
44126069ff26Swdenk	RAMDisks. This construct is useful for instance when you want
44136069ff26Swdenk	to boot over the network using BOOTP etc., where the boot
44146069ff26Swdenk	server provides just a single image file, but you want to get
44156069ff26Swdenk	for instance an OS kernel and a RAMDisk image.
44166069ff26Swdenk
44176069ff26Swdenk	"Multi-File Images" start with a list of image sizes, each
44186069ff26Swdenk	image size (in bytes) specified by an "uint32_t" in network
44196069ff26Swdenk	byte order. This list is terminated by an "(uint32_t)0".
44206069ff26Swdenk	Immediately after the terminating 0 follow the images, one by
44216069ff26Swdenk	one, all aligned on "uint32_t" boundaries (size rounded up to
44226069ff26Swdenk	a multiple of 4 bytes).
44236069ff26Swdenk
44246069ff26Swdenk   "Firmware Images" are binary images containing firmware (like
44256069ff26Swdenk	U-Boot or FPGA images) which usually will be programmed to
44266069ff26Swdenk	flash memory.
44276069ff26Swdenk
44286069ff26Swdenk   "Script files" are command sequences that will be executed by
44296069ff26Swdenk	U-Boot's command interpreter; this feature is especially
44306069ff26Swdenk	useful when you configure U-Boot to use a real shell (hush)
44316069ff26Swdenk	as command interpreter.
44326069ff26Swdenk
443344f074c7SMarek VasutBooting the Linux zImage:
443444f074c7SMarek Vasut-------------------------
443544f074c7SMarek Vasut
443644f074c7SMarek VasutOn some platforms, it's possible to boot Linux zImage. This is done
443744f074c7SMarek Vasutusing the "bootz" command. The syntax of "bootz" command is the same
443844f074c7SMarek Vasutas the syntax of "bootm" command.
443944f074c7SMarek Vasut
4440*017e1f3fSMarek VasutNote, defining the CONFIG_SUPPORT_INITRD_RAW allows user to supply
4441*017e1f3fSMarek Vasutkernel with raw initrd images. The syntax is slightly different, the
4442*017e1f3fSMarek Vasutaddress of the initrd must be augmented by it's size, in the following
4443*017e1f3fSMarek Vasutformat: "<initrd addres>:<initrd size>".
4444*017e1f3fSMarek Vasut
4445c609719bSwdenk
4446c609719bSwdenkStandalone HOWTO:
4447c609719bSwdenk=================
4448c609719bSwdenk
4449c609719bSwdenkOne of the features of U-Boot is that you can dynamically load and
4450c609719bSwdenkrun "standalone" applications, which can use some resources of
4451c609719bSwdenkU-Boot like console I/O functions or interrupt services.
4452c609719bSwdenk
4453c609719bSwdenkTwo simple examples are included with the sources:
4454c609719bSwdenk
4455c609719bSwdenk"Hello World" Demo:
4456c609719bSwdenk-------------------
4457c609719bSwdenk
4458c609719bSwdenk'examples/hello_world.c' contains a small "Hello World" Demo
4459c609719bSwdenkapplication; it is automatically compiled when you build U-Boot.
4460c609719bSwdenkIt's configured to run at address 0x00040004, so you can play with it
4461c609719bSwdenklike that:
4462c609719bSwdenk
4463c609719bSwdenk	=> loads
4464c609719bSwdenk	## Ready for S-Record download ...
4465c609719bSwdenk	~>examples/hello_world.srec
4466c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 ...
4467c609719bSwdenk	[file transfer complete]
4468c609719bSwdenk	[connected]
4469c609719bSwdenk	## Start Addr = 0x00040004
4470c609719bSwdenk
4471c609719bSwdenk	=> go 40004 Hello World! This is a test.
4472c609719bSwdenk	## Starting application at 0x00040004 ...
4473c609719bSwdenk	Hello World
4474c609719bSwdenk	argc = 7
4475c609719bSwdenk	argv[0] = "40004"
4476c609719bSwdenk	argv[1] = "Hello"
4477c609719bSwdenk	argv[2] = "World!"
4478c609719bSwdenk	argv[3] = "This"
4479c609719bSwdenk	argv[4] = "is"
4480c609719bSwdenk	argv[5] = "a"
4481c609719bSwdenk	argv[6] = "test."
4482c609719bSwdenk	argv[7] = "<NULL>"
4483c609719bSwdenk	Hit any key to exit ...
4484c609719bSwdenk
4485c609719bSwdenk	## Application terminated, rc = 0x0
4486c609719bSwdenk
4487c609719bSwdenkAnother example, which demonstrates how to register a CPM interrupt
4488c609719bSwdenkhandler with the U-Boot code, can be found in 'examples/timer.c'.
4489c609719bSwdenkHere, a CPM timer is set up to generate an interrupt every second.
4490c609719bSwdenkThe interrupt service routine is trivial, just printing a '.'
4491c609719bSwdenkcharacter, but this is just a demo program. The application can be
4492c609719bSwdenkcontrolled by the following keys:
4493c609719bSwdenk
4494c609719bSwdenk	? - print current values og the CPM Timer registers
4495c609719bSwdenk	b - enable interrupts and start timer
4496c609719bSwdenk	e - stop timer and disable interrupts
4497c609719bSwdenk	q - quit application
4498c609719bSwdenk
4499c609719bSwdenk	=> loads
4500c609719bSwdenk	## Ready for S-Record download ...
4501c609719bSwdenk	~>examples/timer.srec
4502c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 ...
4503c609719bSwdenk	[file transfer complete]
4504c609719bSwdenk	[connected]
4505c609719bSwdenk	## Start Addr = 0x00040004
4506c609719bSwdenk
4507c609719bSwdenk	=> go 40004
4508c609719bSwdenk	## Starting application at 0x00040004 ...
4509c609719bSwdenk	TIMERS=0xfff00980
4510c609719bSwdenk	Using timer 1
4511c609719bSwdenk	  tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0
4512c609719bSwdenk
4513c609719bSwdenkHit 'b':
4514c609719bSwdenk	[q, b, e, ?] Set interval 1000000 us
4515c609719bSwdenk	Enabling timer
4516c609719bSwdenkHit '?':
4517c609719bSwdenk	[q, b, e, ?] ........
4518c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0
4519c609719bSwdenkHit '?':
4520c609719bSwdenk	[q, b, e, ?] .
4521c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0
4522c609719bSwdenkHit '?':
4523c609719bSwdenk	[q, b, e, ?] .
4524c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0
4525c609719bSwdenkHit '?':
4526c609719bSwdenk	[q, b, e, ?] .
4527c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0
4528c609719bSwdenkHit 'e':
4529c609719bSwdenk	[q, b, e, ?] ...Stopping timer
4530c609719bSwdenkHit 'q':
4531c609719bSwdenk	[q, b, e, ?] ## Application terminated, rc = 0x0
4532c609719bSwdenk
4533c609719bSwdenk
453485ec0bccSwdenkMinicom warning:
453585ec0bccSwdenk================
453685ec0bccSwdenk
45377152b1d0SwdenkOver time, many people have reported problems when trying to use the
453885ec0bccSwdenk"minicom" terminal emulation program for serial download. I (wd)
453985ec0bccSwdenkconsider minicom to be broken, and recommend not to use it. Under
4540f07771ccSwdenkUnix, I recommend to use C-Kermit for general purpose use (and
454185ec0bccSwdenkespecially for kermit binary protocol download ("loadb" command), and
454285ec0bccSwdenkuse "cu" for S-Record download ("loads" command).
454385ec0bccSwdenk
454452f52c14SwdenkNevertheless, if you absolutely want to use it try adding this
454552f52c14Swdenkconfiguration to your "File transfer protocols" section:
454652f52c14Swdenk
454752f52c14Swdenk	   Name	   Program			Name U/D FullScr IO-Red. Multi
454852f52c14Swdenk	X  kermit  /usr/bin/kermit -i -l %l -s	 Y    U	   Y	   N	  N
454952f52c14Swdenk	Y  kermit  /usr/bin/kermit -i -l %l -r	 N    D	   Y	   N	  N
455052f52c14Swdenk
455152f52c14Swdenk
4552c609719bSwdenkNetBSD Notes:
4553c609719bSwdenk=============
4554c609719bSwdenk
4555c609719bSwdenkStarting at version 0.9.2, U-Boot supports NetBSD both as host
4556c609719bSwdenk(build U-Boot) and target system (boots NetBSD/mpc8xx).
4557c609719bSwdenk
4558c609719bSwdenkBuilding requires a cross environment; it is known to work on
4559c609719bSwdenkNetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also
4560c609719bSwdenkneed gmake since the Makefiles are not compatible with BSD make).
4561c609719bSwdenkNote that the cross-powerpc package does not install include files;
4562c609719bSwdenkattempting to build U-Boot will fail because <machine/ansi.h> is
4563c609719bSwdenkmissing.  This file has to be installed and patched manually:
4564c609719bSwdenk
4565c609719bSwdenk	# cd /usr/pkg/cross/powerpc-netbsd/include
4566c609719bSwdenk	# mkdir powerpc
4567c609719bSwdenk	# ln -s powerpc machine
4568c609719bSwdenk	# cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h
4569c609719bSwdenk	# ${EDIT} powerpc/ansi.h	## must remove __va_list, _BSD_VA_LIST
4570c609719bSwdenk
4571c609719bSwdenkNative builds *don't* work due to incompatibilities between native
4572c609719bSwdenkand U-Boot include files.
4573c609719bSwdenk
4574c609719bSwdenkBooting assumes that (the first part of) the image booted is a
4575c609719bSwdenkstage-2 loader which in turn loads and then invokes the kernel
4576c609719bSwdenkproper. Loader sources will eventually appear in the NetBSD source
4577c609719bSwdenktree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the
45782a8af187Swdenkmeantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz
4579c609719bSwdenk
4580c609719bSwdenk
4581c609719bSwdenkImplementation Internals:
4582c609719bSwdenk=========================
4583c609719bSwdenk
4584c609719bSwdenkThe following is not intended to be a complete description of every
4585c609719bSwdenkimplementation detail. However, it should help to understand the
4586c609719bSwdenkinner workings of U-Boot and make it easier to port it to custom
4587c609719bSwdenkhardware.
4588c609719bSwdenk
4589c609719bSwdenk
4590c609719bSwdenkInitial Stack, Global Data:
4591c609719bSwdenk---------------------------
4592c609719bSwdenk
4593c609719bSwdenkThe implementation of U-Boot is complicated by the fact that U-Boot
4594c609719bSwdenkstarts running out of ROM (flash memory), usually without access to
4595c609719bSwdenksystem RAM (because the memory controller is not initialized yet).
4596c609719bSwdenkThis means that we don't have writable Data or BSS segments, and BSS
4597c609719bSwdenkis not initialized as zero. To be able to get a C environment working
4598c609719bSwdenkat all, we have to allocate at least a minimal stack. Implementation
4599c609719bSwdenkoptions for this are defined and restricted by the CPU used: Some CPU
4600c609719bSwdenkmodels provide on-chip memory (like the IMMR area on MPC8xx and
4601c609719bSwdenkMPC826x processors), on others (parts of) the data cache can be
4602c609719bSwdenklocked as (mis-) used as memory, etc.
4603c609719bSwdenk
46047152b1d0Swdenk	Chris Hallinan posted a good summary of these issues to the
46050668236bSWolfgang Denk	U-Boot mailing list:
460643d9616cSwdenk
460743d9616cSwdenk	Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)?
460843d9616cSwdenk	From: "Chris Hallinan" <clh@net1plus.com>
460943d9616cSwdenk	Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET)
461043d9616cSwdenk	...
461143d9616cSwdenk
461243d9616cSwdenk	Correct me if I'm wrong, folks, but the way I understand it
461343d9616cSwdenk	is this: Using DCACHE as initial RAM for Stack, etc, does not
461443d9616cSwdenk	require any physical RAM backing up the cache. The cleverness
461543d9616cSwdenk	is that the cache is being used as a temporary supply of
461643d9616cSwdenk	necessary storage before the SDRAM controller is setup. It's
461711ccc33fSMarcel Ziswiler	beyond the scope of this list to explain the details, but you
461843d9616cSwdenk	can see how this works by studying the cache architecture and
461943d9616cSwdenk	operation in the architecture and processor-specific manuals.
462043d9616cSwdenk
462143d9616cSwdenk	OCM is On Chip Memory, which I believe the 405GP has 4K. It
462243d9616cSwdenk	is another option for the system designer to use as an
462311ccc33fSMarcel Ziswiler	initial stack/RAM area prior to SDRAM being available. Either
462443d9616cSwdenk	option should work for you. Using CS 4 should be fine if your
462543d9616cSwdenk	board designers haven't used it for something that would
462643d9616cSwdenk	cause you grief during the initial boot! It is frequently not
462743d9616cSwdenk	used.
462843d9616cSwdenk
46296d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	CONFIG_SYS_INIT_RAM_ADDR should be somewhere that won't interfere
463043d9616cSwdenk	with your processor/board/system design. The default value
463143d9616cSwdenk	you will find in any recent u-boot distribution in
46328a316c9bSStefan Roese	walnut.h should work for you. I'd set it to a value larger
463343d9616cSwdenk	than your SDRAM module. If you have a 64MB SDRAM module, set
463443d9616cSwdenk	it above 400_0000. Just make sure your board has no resources
463543d9616cSwdenk	that are supposed to respond to that address! That code in
463643d9616cSwdenk	start.S has been around a while and should work as is when
463743d9616cSwdenk	you get the config right.
463843d9616cSwdenk
463943d9616cSwdenk	-Chris Hallinan
464043d9616cSwdenk	DS4.COM, Inc.
464143d9616cSwdenk
4642c609719bSwdenkIt is essential to remember this, since it has some impact on the C
4643c609719bSwdenkcode for the initialization procedures:
4644c609719bSwdenk
4645c609719bSwdenk* Initialized global data (data segment) is read-only. Do not attempt
4646c609719bSwdenk  to write it.
4647c609719bSwdenk
464811ccc33fSMarcel Ziswiler* Do not use any uninitialized global data (or implicitely initialized
4649c609719bSwdenk  as zero data - BSS segment) at all - this is undefined, initiali-
46507152b1d0Swdenk  zation is performed later (when relocating to RAM).
4651c609719bSwdenk
4652c609719bSwdenk* Stack space is very limited. Avoid big data buffers or things like
4653c609719bSwdenk  that.
4654c609719bSwdenk
4655c609719bSwdenkHaving only the stack as writable memory limits means we cannot use
4656c609719bSwdenknormal global data to share information beween the code. But it
4657c609719bSwdenkturned out that the implementation of U-Boot can be greatly
4658c609719bSwdenksimplified by making a global data structure (gd_t) available to all
4659c609719bSwdenkfunctions. We could pass a pointer to this data as argument to _all_
4660c609719bSwdenkfunctions, but this would bloat the code. Instead we use a feature of
4661c609719bSwdenkthe GCC compiler (Global Register Variables) to share the data: we
4662c609719bSwdenkplace a pointer (gd) to the global data into a register which we
4663c609719bSwdenkreserve for this purpose.
4664c609719bSwdenk
46657152b1d0SwdenkWhen choosing a register for such a purpose we are restricted by the
4666c609719bSwdenkrelevant  (E)ABI  specifications for the current architecture, and by
4667c609719bSwdenkGCC's implementation.
4668c609719bSwdenk
4669c609719bSwdenkFor PowerPC, the following registers have specific use:
4670c609719bSwdenk	R1:	stack pointer
4671e7670f6cSWolfgang Denk	R2:	reserved for system use
4672c609719bSwdenk	R3-R4:	parameter passing and return values
4673c609719bSwdenk	R5-R10: parameter passing
4674c609719bSwdenk	R13:	small data area pointer
4675c609719bSwdenk	R30:	GOT pointer
4676c609719bSwdenk	R31:	frame pointer
4677c609719bSwdenk
4678e6bee808SJoakim Tjernlund	(U-Boot also uses R12 as internal GOT pointer. r12
4679e6bee808SJoakim Tjernlund	is a volatile register so r12 needs to be reset when
4680e6bee808SJoakim Tjernlund	going back and forth between asm and C)
4681c609719bSwdenk
4682e7670f6cSWolfgang Denk    ==> U-Boot will use R2 to hold a pointer to the global data
4683c609719bSwdenk
4684c609719bSwdenk    Note: on PPC, we could use a static initializer (since the
4685c609719bSwdenk    address of the global data structure is known at compile time),
4686c609719bSwdenk    but it turned out that reserving a register results in somewhat
4687c609719bSwdenk    smaller code - although the code savings are not that big (on
4688c609719bSwdenk    average for all boards 752 bytes for the whole U-Boot image,
4689c609719bSwdenk    624 text + 127 data).
4690c609719bSwdenk
4691c4db335cSRobin GetzOn Blackfin, the normal C ABI (except for P3) is followed as documented here:
46924c58eb55SMike Frysinger	http://docs.blackfin.uclinux.org/doku.php?id=application_binary_interface
46934c58eb55SMike Frysinger
4694c4db335cSRobin Getz    ==> U-Boot will use P3 to hold a pointer to the global data
46954c58eb55SMike Frysinger
4696c609719bSwdenkOn ARM, the following registers are used:
4697c609719bSwdenk
4698c609719bSwdenk	R0:	function argument word/integer result
4699c609719bSwdenk	R1-R3:	function argument word
4700c609719bSwdenk	R9:	GOT pointer
4701c609719bSwdenk	R10:	stack limit (used only if stack checking if enabled)
4702c609719bSwdenk	R11:	argument (frame) pointer
4703c609719bSwdenk	R12:	temporary workspace
4704c609719bSwdenk	R13:	stack pointer
4705c609719bSwdenk	R14:	link register
4706c609719bSwdenk	R15:	program counter
4707c609719bSwdenk
4708c609719bSwdenk    ==> U-Boot will use R8 to hold a pointer to the global data
4709c609719bSwdenk
47100df01fd3SThomas ChouOn Nios II, the ABI is documented here:
47110df01fd3SThomas Chou	http://www.altera.com/literature/hb/nios2/n2cpu_nii51016.pdf
47120df01fd3SThomas Chou
47130df01fd3SThomas Chou    ==> U-Boot will use gp to hold a pointer to the global data
47140df01fd3SThomas Chou
47150df01fd3SThomas Chou    Note: on Nios II, we give "-G0" option to gcc and don't use gp
47160df01fd3SThomas Chou    to access small data sections, so gp is free.
47170df01fd3SThomas Chou
4718afc1ce82SMacpaul LinOn NDS32, the following registers are used:
4719afc1ce82SMacpaul Lin
4720afc1ce82SMacpaul Lin	R0-R1:	argument/return
4721afc1ce82SMacpaul Lin	R2-R5:	argument
4722afc1ce82SMacpaul Lin	R15:	temporary register for assembler
4723afc1ce82SMacpaul Lin	R16:	trampoline register
4724afc1ce82SMacpaul Lin	R28:	frame pointer (FP)
4725afc1ce82SMacpaul Lin	R29:	global pointer (GP)
4726afc1ce82SMacpaul Lin	R30:	link register (LP)
4727afc1ce82SMacpaul Lin	R31:	stack pointer (SP)
4728afc1ce82SMacpaul Lin	PC:	program counter (PC)
4729afc1ce82SMacpaul Lin
4730afc1ce82SMacpaul Lin    ==> U-Boot will use R10 to hold a pointer to the global data
4731afc1ce82SMacpaul Lin
4732d87080b7SWolfgang DenkNOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope,
4733d87080b7SWolfgang Denkor current versions of GCC may "optimize" the code too much.
4734c609719bSwdenk
4735c609719bSwdenkMemory Management:
4736c609719bSwdenk------------------
4737c609719bSwdenk
4738c609719bSwdenkU-Boot runs in system state and uses physical addresses, i.e. the
4739c609719bSwdenkMMU is not used either for address mapping nor for memory protection.
4740c609719bSwdenk
4741c609719bSwdenkThe available memory is mapped to fixed addresses using the memory
4742c609719bSwdenkcontroller. In this process, a contiguous block is formed for each
4743c609719bSwdenkmemory type (Flash, SDRAM, SRAM), even when it consists of several
4744c609719bSwdenkphysical memory banks.
4745c609719bSwdenk
4746c609719bSwdenkU-Boot is installed in the first 128 kB of the first Flash bank (on
4747c609719bSwdenkTQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After
4748c609719bSwdenkbooting and sizing and initializing DRAM, the code relocates itself
4749c609719bSwdenkto the upper end of DRAM. Immediately below the U-Boot code some
47506d0f6bcfSJean-Christophe PLAGNIOL-VILLARDmemory is reserved for use by malloc() [see CONFIG_SYS_MALLOC_LEN
4751c609719bSwdenkconfiguration setting]. Below that, a structure with global Board
4752c609719bSwdenkInfo data is placed, followed by the stack (growing downward).
4753c609719bSwdenk
4754c609719bSwdenkAdditionally, some exception handler code is copied to the low 8 kB
4755c609719bSwdenkof DRAM (0x00000000 ... 0x00001FFF).
4756c609719bSwdenk
4757c609719bSwdenkSo a typical memory configuration with 16 MB of DRAM could look like
4758c609719bSwdenkthis:
4759c609719bSwdenk
4760c609719bSwdenk	0x0000 0000	Exception Vector code
4761c609719bSwdenk	      :
4762c609719bSwdenk	0x0000 1FFF
4763c609719bSwdenk	0x0000 2000	Free for Application Use
4764c609719bSwdenk	      :
4765c609719bSwdenk	      :
4766c609719bSwdenk
4767c609719bSwdenk	      :
4768c609719bSwdenk	      :
4769c609719bSwdenk	0x00FB FF20	Monitor Stack (Growing downward)
4770c609719bSwdenk	0x00FB FFAC	Board Info Data and permanent copy of global data
4771c609719bSwdenk	0x00FC 0000	Malloc Arena
4772c609719bSwdenk	      :
4773c609719bSwdenk	0x00FD FFFF
4774c609719bSwdenk	0x00FE 0000	RAM Copy of Monitor Code
4775c609719bSwdenk	...		eventually: LCD or video framebuffer
4776c609719bSwdenk	...		eventually: pRAM (Protected RAM - unchanged by reset)
4777c609719bSwdenk	0x00FF FFFF	[End of RAM]
4778c609719bSwdenk
4779c609719bSwdenk
4780c609719bSwdenkSystem Initialization:
4781c609719bSwdenk----------------------
4782c609719bSwdenk
4783c609719bSwdenkIn the reset configuration, U-Boot starts at the reset entry point
478411ccc33fSMarcel Ziswiler(on most PowerPC systems at address 0x00000100). Because of the reset
4785c609719bSwdenkconfiguration for CS0# this is a mirror of the onboard Flash memory.
47867152b1d0SwdenkTo be able to re-map memory U-Boot then jumps to its link address.
4787c609719bSwdenkTo be able to implement the initialization code in C, a (small!)
4788c609719bSwdenkinitial stack is set up in the internal Dual Ported RAM (in case CPUs
4789c609719bSwdenkwhich provide such a feature like MPC8xx or MPC8260), or in a locked
4790c609719bSwdenkpart of the data cache. After that, U-Boot initializes the CPU core,
4791c609719bSwdenkthe caches and the SIU.
4792c609719bSwdenk
4793c609719bSwdenkNext, all (potentially) available memory banks are mapped using a
4794c609719bSwdenkpreliminary mapping. For example, we put them on 512 MB boundaries
4795c609719bSwdenk(multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash
4796c609719bSwdenkon 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is
4797c609719bSwdenkprogrammed for SDRAM access. Using the temporary configuration, a
4798c609719bSwdenksimple memory test is run that determines the size of the SDRAM
4799c609719bSwdenkbanks.
4800c609719bSwdenk
4801c609719bSwdenkWhen there is more than one SDRAM bank, and the banks are of
48027152b1d0Swdenkdifferent size, the largest is mapped first. For equal size, the first
4803c609719bSwdenkbank (CS2#) is mapped first. The first mapping is always for address
4804c609719bSwdenk0x00000000, with any additional banks following immediately to create
4805c609719bSwdenkcontiguous memory starting from 0.
4806c609719bSwdenk
4807c609719bSwdenkThen, the monitor installs itself at the upper end of the SDRAM area
4808c609719bSwdenkand allocates memory for use by malloc() and for the global Board
4809c609719bSwdenkInfo data; also, the exception vector code is copied to the low RAM
4810c609719bSwdenkpages, and the final stack is set up.
4811c609719bSwdenk
4812c609719bSwdenkOnly after this relocation will you have a "normal" C environment;
4813c609719bSwdenkuntil that you are restricted in several ways, mostly because you are
4814c609719bSwdenkrunning from ROM, and because the code will have to be relocated to a
4815c609719bSwdenknew address in RAM.
4816c609719bSwdenk
4817c609719bSwdenk
4818c609719bSwdenkU-Boot Porting Guide:
4819c609719bSwdenk----------------------
4820c609719bSwdenk
4821c609719bSwdenk[Based on messages by Jerry Van Baren in the U-Boot-Users mailing
48226aff3115Swdenklist, October 2002]
4823c609719bSwdenk
4824c609719bSwdenk
4825c609719bSwdenkint main(int argc, char *argv[])
4826c609719bSwdenk{
4827c609719bSwdenk	sighandler_t no_more_time;
4828c609719bSwdenk
4829c609719bSwdenk	signal(SIGALRM, no_more_time);
4830c609719bSwdenk	alarm(PROJECT_DEADLINE - toSec (3 * WEEK));
4831c609719bSwdenk
4832c609719bSwdenk	if (available_money > available_manpower) {
48336c3fef28SJerry Van Baren		Pay consultant to port U-Boot;
4834c609719bSwdenk		return 0;
4835c609719bSwdenk	}
4836c609719bSwdenk
4837c609719bSwdenk	Download latest U-Boot source;
4838c609719bSwdenk
48390668236bSWolfgang Denk	Subscribe to u-boot mailing list;
48406aff3115Swdenk
48416c3fef28SJerry Van Baren	if (clueless)
4842c609719bSwdenk		email("Hi, I am new to U-Boot, how do I get started?");
4843c609719bSwdenk
4844c609719bSwdenk	while (learning) {
4845c609719bSwdenk		Read the README file in the top level directory;
48467cb22f97Swdenk		Read http://www.denx.de/twiki/bin/view/DULG/Manual;
48476c3fef28SJerry Van Baren		Read applicable doc/*.README;
4848c609719bSwdenk		Read the source, Luke;
48496c3fef28SJerry Van Baren		/* find . -name "*.[chS]" | xargs grep -i <keyword> */
4850c609719bSwdenk	}
4851c609719bSwdenk
48526c3fef28SJerry Van Baren	if (available_money > toLocalCurrency ($2500))
48536c3fef28SJerry Van Baren		Buy a BDI3000;
48546c3fef28SJerry Van Baren	else
4855c609719bSwdenk		Add a lot of aggravation and time;
4856c609719bSwdenk
48576c3fef28SJerry Van Baren	if (a similar board exists) {	/* hopefully... */
48586c3fef28SJerry Van Baren		cp -a board/<similar> board/<myboard>
48596c3fef28SJerry Van Baren		cp include/configs/<similar>.h include/configs/<myboard>.h
48606c3fef28SJerry Van Baren	} else {
4861c609719bSwdenk		Create your own board support subdirectory;
48626c3fef28SJerry Van Baren		Create your own board include/configs/<myboard>.h file;
48636c3fef28SJerry Van Baren	}
48646c3fef28SJerry Van Baren	Edit new board/<myboard> files
48656c3fef28SJerry Van Baren	Edit new include/configs/<myboard>.h
4866c609719bSwdenk
48676c3fef28SJerry Van Baren	while (!accepted) {
4868c609719bSwdenk		while (!running) {
4869c609719bSwdenk			do {
4870c609719bSwdenk				Add / modify source code;
4871c609719bSwdenk			} until (compiles);
4872c609719bSwdenk			Debug;
4873c609719bSwdenk			if (clueless)
4874c609719bSwdenk				email("Hi, I am having problems...");
4875c609719bSwdenk		}
48766c3fef28SJerry Van Baren		Send patch file to the U-Boot email list;
48776c3fef28SJerry Van Baren		if (reasonable critiques)
48786c3fef28SJerry Van Baren			Incorporate improvements from email list code review;
48796c3fef28SJerry Van Baren		else
48806c3fef28SJerry Van Baren			Defend code as written;
48816c3fef28SJerry Van Baren	}
4882c609719bSwdenk
4883c609719bSwdenk	return 0;
4884c609719bSwdenk}
4885c609719bSwdenk
4886c609719bSwdenkvoid no_more_time (int sig)
4887c609719bSwdenk{
4888c609719bSwdenk      hire_a_guru();
4889c609719bSwdenk}
4890c609719bSwdenk
4891c609719bSwdenk
4892c609719bSwdenkCoding Standards:
4893c609719bSwdenk-----------------
4894c609719bSwdenk
4895c609719bSwdenkAll contributions to U-Boot should conform to the Linux kernel
48962c051651SDetlev Zundelcoding style; see the file "Documentation/CodingStyle" and the script
48977ca9296eSWolfgang Denk"scripts/Lindent" in your Linux kernel source directory.
4898c609719bSwdenk
48992c051651SDetlev ZundelSource files originating from a different project (for example the
49002c051651SDetlev ZundelMTD subsystem) are generally exempt from these guidelines and are not
49012c051651SDetlev Zundelreformated to ease subsequent migration to newer versions of those
49022c051651SDetlev Zundelsources.
49032c051651SDetlev Zundel
49042c051651SDetlev ZundelPlease note that U-Boot is implemented in C (and to some small parts in
49052c051651SDetlev ZundelAssembler); no C++ is used, so please do not use C++ style comments (//)
49062c051651SDetlev Zundelin your code.
4907c609719bSwdenk
4908c178d3daSwdenkPlease also stick to the following formatting rules:
4909180d3f74Swdenk- remove any trailing white space
49107ca9296eSWolfgang Denk- use TAB characters for indentation and vertical alignment, not spaces
4911180d3f74Swdenk- make sure NOT to use DOS '\r\n' line feeds
49127ca9296eSWolfgang Denk- do not add more than 2 consecutive empty lines to source files
4913180d3f74Swdenk- do not add trailing empty lines to source files
4914180d3f74Swdenk
4915c609719bSwdenkSubmissions which do not conform to the standards may be returned
4916c609719bSwdenkwith a request to reformat the changes.
4917c609719bSwdenk
4918c609719bSwdenk
4919c609719bSwdenkSubmitting Patches:
4920c609719bSwdenk-------------------
4921c609719bSwdenk
4922c609719bSwdenkSince the number of patches for U-Boot is growing, we need to
4923c609719bSwdenkestablish some rules. Submissions which do not conform to these rules
4924c609719bSwdenkmay be rejected, even when they contain important and valuable stuff.
4925c609719bSwdenk
49260d28f34bSMagnus LiljaPlease see http://www.denx.de/wiki/U-Boot/Patches for details.
4927218ca724SWolfgang Denk
49280668236bSWolfgang DenkPatches shall be sent to the u-boot mailing list <u-boot@lists.denx.de>;
49290668236bSWolfgang Denksee http://lists.denx.de/mailman/listinfo/u-boot
49300668236bSWolfgang Denk
4931c609719bSwdenkWhen you send a patch, please include the following information with
4932c609719bSwdenkit:
4933c609719bSwdenk
4934c609719bSwdenk* For bug fixes: a description of the bug and how your patch fixes
4935c609719bSwdenk  this bug. Please try to include a way of demonstrating that the
4936c609719bSwdenk  patch actually fixes something.
4937c609719bSwdenk
4938c609719bSwdenk* For new features: a description of the feature and your
4939c609719bSwdenk  implementation.
4940c609719bSwdenk
4941c609719bSwdenk* A CHANGELOG entry as plaintext (separate from the patch)
4942c609719bSwdenk
4943c609719bSwdenk* For major contributions, your entry to the CREDITS file
4944c609719bSwdenk
4945c609719bSwdenk* When you add support for a new board, don't forget to add this
49467ca9296eSWolfgang Denk  board to the MAINTAINERS file, too.
4947c609719bSwdenk
4948c609719bSwdenk* If your patch adds new configuration options, don't forget to
4949c609719bSwdenk  document these in the README file.
4950c609719bSwdenk
4951218ca724SWolfgang Denk* The patch itself. If you are using git (which is *strongly*
4952218ca724SWolfgang Denk  recommended) you can easily generate the patch using the
49537ca9296eSWolfgang Denk  "git format-patch". If you then use "git send-email" to send it to
4954218ca724SWolfgang Denk  the U-Boot mailing list, you will avoid most of the common problems
4955218ca724SWolfgang Denk  with some other mail clients.
4956c609719bSwdenk
4957218ca724SWolfgang Denk  If you cannot use git, use "diff -purN OLD NEW". If your version of
4958218ca724SWolfgang Denk  diff does not support these options, then get the latest version of
4959218ca724SWolfgang Denk  GNU diff.
49606dff5529Swdenk
4961218ca724SWolfgang Denk  The current directory when running this command shall be the parent
4962218ca724SWolfgang Denk  directory of the U-Boot source tree (i. e. please make sure that
4963218ca724SWolfgang Denk  your patch includes sufficient directory information for the
4964218ca724SWolfgang Denk  affected files).
4965218ca724SWolfgang Denk
4966218ca724SWolfgang Denk  We prefer patches as plain text. MIME attachments are discouraged,
4967218ca724SWolfgang Denk  and compressed attachments must not be used.
4968c609719bSwdenk
496952f52c14Swdenk* If one logical set of modifications affects or creates several
497052f52c14Swdenk  files, all these changes shall be submitted in a SINGLE patch file.
497152f52c14Swdenk
497252f52c14Swdenk* Changesets that contain different, unrelated modifications shall be
497352f52c14Swdenk  submitted as SEPARATE patches, one patch per changeset.
497452f52c14Swdenk
497552f52c14Swdenk
4976c609719bSwdenkNotes:
4977c609719bSwdenk
4978c609719bSwdenk* Before sending the patch, run the MAKEALL script on your patched
4979c609719bSwdenk  source tree and make sure that no errors or warnings are reported
4980c609719bSwdenk  for any of the boards.
4981c609719bSwdenk
4982c609719bSwdenk* Keep your modifications to the necessary minimum: A patch
4983c609719bSwdenk  containing several unrelated changes or arbitrary reformats will be
4984c609719bSwdenk  returned with a request to re-formatting / split it.
4985c609719bSwdenk
4986c609719bSwdenk* If you modify existing code, make sure that your new code does not
4987c609719bSwdenk  add to the memory footprint of the code ;-) Small is beautiful!
4988c609719bSwdenk  When adding new features, these should compile conditionally only
4989c609719bSwdenk  (using #ifdef), and the resulting code with the new feature
4990c609719bSwdenk  disabled must not need more memory than the old code without your
4991c609719bSwdenk  modification.
499290dc6704Swdenk
49930668236bSWolfgang Denk* Remember that there is a size limit of 100 kB per message on the
49940668236bSWolfgang Denk  u-boot mailing list. Bigger patches will be moderated. If they are
49950668236bSWolfgang Denk  reasonable and not too big, they will be acknowledged. But patches
49960668236bSWolfgang Denk  bigger than the size limit should be avoided.
4997