xref: /openbmc/u-boot/README (revision 53fdc7ef2e43902c4415a81a434c35f9ed8713bc)
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
57adb9d851SRobert P. J. DayNote: There is no CHANGELOG file in the actual U-Boot source tree;
58adb9d851SRobert P. J. Dayit can be created dynamically from the Git log using:
59adb9d851SRobert P. J. Day
60adb9d851SRobert P. J. Day	make CHANGELOG
61adb9d851SRobert P. J. Day
62c609719bSwdenk
63c609719bSwdenkWhere to get help:
64c609719bSwdenk==================
65c609719bSwdenk
66c609719bSwdenkIn case you have questions about, problems with or contributions for
67c609719bSwdenkU-Boot you should send a message to the U-Boot mailing list at
680c32565fSPeter Tyser<u-boot@lists.denx.de>. There is also an archive of previous traffic
690c32565fSPeter Tyseron the mailing list - please search the archive before asking FAQ's.
700c32565fSPeter TyserPlease see http://lists.denx.de/pipermail/u-boot and
710c32565fSPeter Tyserhttp://dir.gmane.org/gmane.comp.boot-loaders.u-boot
72c609719bSwdenk
73c609719bSwdenk
74218ca724SWolfgang DenkWhere to get source code:
75218ca724SWolfgang Denk=========================
76218ca724SWolfgang Denk
77218ca724SWolfgang DenkThe U-Boot source code is maintained in the git repository at
78218ca724SWolfgang Denkgit://www.denx.de/git/u-boot.git ; you can browse it online at
79218ca724SWolfgang Denkhttp://www.denx.de/cgi-bin/gitweb.cgi?p=u-boot.git;a=summary
80218ca724SWolfgang Denk
81218ca724SWolfgang DenkThe "snapshot" links on this page allow you to download tarballs of
8211ccc33fSMarcel Ziswilerany version you might be interested in. Official releases are also
83218ca724SWolfgang Denkavailable for FTP download from the ftp://ftp.denx.de/pub/u-boot/
84218ca724SWolfgang Denkdirectory.
85218ca724SWolfgang Denk
86d4ee711dSAnatolij GustschinPre-built (and tested) images are available from
87218ca724SWolfgang Denkftp://ftp.denx.de/pub/u-boot/images/
88218ca724SWolfgang Denk
89218ca724SWolfgang Denk
90c609719bSwdenkWhere we come from:
91c609719bSwdenk===================
92c609719bSwdenk
93c609719bSwdenk- start from 8xxrom sources
9424ee89b9Swdenk- create PPCBoot project (http://sourceforge.net/projects/ppcboot)
95c609719bSwdenk- clean up code
96c609719bSwdenk- make it easier to add custom boards
97c609719bSwdenk- make it possible to add other [PowerPC] CPUs
98c609719bSwdenk- extend functions, especially:
99c609719bSwdenk  * Provide extended interface to Linux boot loader
100c609719bSwdenk  * S-Record download
101c609719bSwdenk  * network boot
10211ccc33fSMarcel Ziswiler  * PCMCIA / CompactFlash / ATA disk / SCSI ... boot
10324ee89b9Swdenk- create ARMBoot project (http://sourceforge.net/projects/armboot)
104c609719bSwdenk- add other CPU families (starting with ARM)
10524ee89b9Swdenk- create U-Boot project (http://sourceforge.net/projects/u-boot)
1060d28f34bSMagnus Lilja- current project page: see http://www.denx.de/wiki/U-Boot
10724ee89b9Swdenk
10824ee89b9Swdenk
10924ee89b9SwdenkNames and Spelling:
11024ee89b9Swdenk===================
11124ee89b9Swdenk
11224ee89b9SwdenkThe "official" name of this project is "Das U-Boot". The spelling
11324ee89b9Swdenk"U-Boot" shall be used in all written text (documentation, comments
11424ee89b9Swdenkin source files etc.). Example:
11524ee89b9Swdenk
11624ee89b9Swdenk	This is the README file for the U-Boot project.
11724ee89b9Swdenk
11824ee89b9SwdenkFile names etc. shall be based on the string "u-boot". Examples:
11924ee89b9Swdenk
12024ee89b9Swdenk	include/asm-ppc/u-boot.h
12124ee89b9Swdenk
12224ee89b9Swdenk	#include <asm/u-boot.h>
12324ee89b9Swdenk
12424ee89b9SwdenkVariable names, preprocessor constants etc. shall be either based on
12524ee89b9Swdenkthe string "u_boot" or on "U_BOOT". Example:
12624ee89b9Swdenk
12724ee89b9Swdenk	U_BOOT_VERSION		u_boot_logo
12824ee89b9Swdenk	IH_OS_U_BOOT		u_boot_hush_start
129c609719bSwdenk
130c609719bSwdenk
13193f19cc0SwdenkVersioning:
13293f19cc0Swdenk===========
13393f19cc0Swdenk
134360d883aSThomas WeberStarting with the release in October 2008, the names of the releases
135360d883aSThomas Weberwere changed from numerical release numbers without deeper meaning
136360d883aSThomas Weberinto a time stamp based numbering. Regular releases are identified by
137360d883aSThomas Webernames consisting of the calendar year and month of the release date.
138360d883aSThomas WeberAdditional fields (if present) indicate release candidates or bug fix
139360d883aSThomas Weberreleases in "stable" maintenance trees.
14093f19cc0Swdenk
141360d883aSThomas WeberExamples:
142360d883aSThomas Weber	U-Boot v2009.11	    - Release November 2009
143360d883aSThomas Weber	U-Boot v2009.11.1   - Release 1 in version November 2009 stable tree
144360d883aSThomas Weber	U-Boot v2010.09-rc1 - Release candiate 1 for September 2010 release
14593f19cc0Swdenk
14693f19cc0Swdenk
147c609719bSwdenkDirectory Hierarchy:
148c609719bSwdenk====================
149c609719bSwdenk
1508d321b81SPeter Tyser/arch			Architecture specific files
1518d321b81SPeter Tyser  /arm			Files generic to ARM architecture
1528d321b81SPeter Tyser    /cpu		CPU specific files
1538d321b81SPeter Tyser      /arm720t		Files specific to ARM 720 CPUs
1548d321b81SPeter Tyser      /arm920t		Files specific to ARM 920 CPUs
1556eb0921aSAndreas Bießmann	/at91		Files specific to Atmel AT91RM9200 CPU
1568d321b81SPeter Tyser	/imx		Files specific to Freescale MC9328 i.MX CPUs
1578d321b81SPeter Tyser	/s3c24x0	Files specific to Samsung S3C24X0 CPUs
1588d321b81SPeter Tyser      /arm925t		Files specific to ARM 925 CPUs
1598d321b81SPeter Tyser      /arm926ejs	Files specific to ARM 926 CPUs
1608d321b81SPeter Tyser      /arm1136		Files specific to ARM 1136 CPUs
1618d321b81SPeter Tyser      /ixp		Files specific to Intel XScale IXP CPUs
1628d321b81SPeter Tyser      /pxa		Files specific to Intel XScale PXA CPUs
1638d321b81SPeter Tyser      /s3c44b0		Files specific to Samsung S3C44B0 CPUs
1648d321b81SPeter Tyser      /sa1100		Files specific to Intel StrongARM SA1100 CPUs
1658d321b81SPeter Tyser    /lib		Architecture specific library files
1668d321b81SPeter Tyser  /avr32		Files generic to AVR32 architecture
1678d321b81SPeter Tyser    /cpu		CPU specific files
1688d321b81SPeter Tyser    /lib		Architecture specific library files
1698d321b81SPeter Tyser  /blackfin		Files generic to Analog Devices Blackfin architecture
1708d321b81SPeter Tyser    /cpu		CPU specific files
1718d321b81SPeter Tyser    /lib		Architecture specific library files
172fea25720SGraeme Russ  /x86			Files generic to x86 architecture
1738d321b81SPeter Tyser    /cpu		CPU specific files
1748d321b81SPeter Tyser    /lib		Architecture specific library files
1758d321b81SPeter Tyser  /m68k			Files generic to m68k architecture
1768d321b81SPeter Tyser    /cpu		CPU specific files
1778d321b81SPeter Tyser      /mcf52x2		Files specific to Freescale ColdFire MCF52x2 CPUs
1788d321b81SPeter Tyser      /mcf5227x		Files specific to Freescale ColdFire MCF5227x CPUs
1798d321b81SPeter Tyser      /mcf532x		Files specific to Freescale ColdFire MCF5329 CPUs
1808d321b81SPeter Tyser      /mcf5445x		Files specific to Freescale ColdFire MCF5445x CPUs
1818d321b81SPeter Tyser      /mcf547x_8x	Files specific to Freescale ColdFire MCF547x_8x CPUs
1828d321b81SPeter Tyser    /lib		Architecture specific library files
1838d321b81SPeter Tyser  /microblaze		Files generic to microblaze architecture
1848d321b81SPeter Tyser    /cpu		CPU specific files
1858d321b81SPeter Tyser    /lib		Architecture specific library files
1868d321b81SPeter Tyser  /mips			Files generic to MIPS architecture
1878d321b81SPeter Tyser    /cpu		CPU specific files
18892bbd64eSDaniel Schwierzeck      /mips32		Files specific to MIPS32 CPUs
18980421fccSXiangfu Liu      /xburst		Files specific to Ingenic XBurst CPUs
1908d321b81SPeter Tyser    /lib		Architecture specific library files
191afc1ce82SMacpaul Lin  /nds32		Files generic to NDS32 architecture
192afc1ce82SMacpaul Lin    /cpu		CPU specific files
193afc1ce82SMacpaul Lin      /n1213		Files specific to Andes Technology N1213 CPUs
194afc1ce82SMacpaul Lin    /lib		Architecture specific library files
1958d321b81SPeter Tyser  /nios2		Files generic to Altera NIOS2 architecture
1968d321b81SPeter Tyser    /cpu		CPU specific files
1978d321b81SPeter Tyser    /lib		Architecture specific library files
198a47a12beSStefan Roese  /powerpc		Files generic to PowerPC architecture
1998d321b81SPeter Tyser    /cpu		CPU specific files
2008d321b81SPeter Tyser      /74xx_7xx		Files specific to Freescale MPC74xx and 7xx CPUs
2018d321b81SPeter Tyser      /mpc5xx		Files specific to Freescale MPC5xx CPUs
2028d321b81SPeter Tyser      /mpc5xxx		Files specific to Freescale MPC5xxx CPUs
2038d321b81SPeter Tyser      /mpc8xx		Files specific to Freescale MPC8xx CPUs
2048d321b81SPeter Tyser      /mpc8220		Files specific to Freescale MPC8220 CPUs
2058d321b81SPeter Tyser      /mpc824x		Files specific to Freescale MPC824x CPUs
2068d321b81SPeter Tyser      /mpc8260		Files specific to Freescale MPC8260 CPUs
2078d321b81SPeter Tyser      /mpc85xx		Files specific to Freescale MPC85xx CPUs
2088d321b81SPeter Tyser      /ppc4xx		Files specific to AMCC PowerPC 4xx CPUs
2098d321b81SPeter Tyser    /lib		Architecture specific library files
2108d321b81SPeter Tyser  /sh			Files generic to SH architecture
2118d321b81SPeter Tyser    /cpu		CPU specific files
2128d321b81SPeter Tyser      /sh2		Files specific to sh2 CPUs
2138d321b81SPeter Tyser      /sh3		Files specific to sh3 CPUs
2148d321b81SPeter Tyser      /sh4		Files specific to sh4 CPUs
2158d321b81SPeter Tyser    /lib		Architecture specific library files
2168d321b81SPeter Tyser  /sparc		Files generic to SPARC architecture
2178d321b81SPeter Tyser    /cpu		CPU specific files
2188d321b81SPeter Tyser      /leon2		Files specific to Gaisler LEON2 SPARC CPU
2198d321b81SPeter Tyser      /leon3		Files specific to Gaisler LEON3 SPARC CPU
2208d321b81SPeter Tyser    /lib		Architecture specific library files
2218d321b81SPeter Tyser/api			Machine/arch independent API for external apps
2228d321b81SPeter Tyser/board			Board dependent files
2238d321b81SPeter Tyser/common			Misc architecture independent functions
2248d321b81SPeter Tyser/disk			Code for disk drive partition handling
2258d321b81SPeter Tyser/doc			Documentation (don't expect too much)
2268d321b81SPeter Tyser/drivers		Commonly used device drivers
2278d321b81SPeter Tyser/examples		Example code for standalone applications, etc.
2288d321b81SPeter Tyser/fs			Filesystem code (cramfs, ext2, jffs2, etc.)
2298d321b81SPeter Tyser/include		Header Files
2308d321b81SPeter Tyser/lib			Files generic to all architectures
2318d321b81SPeter Tyser  /libfdt		Library files to support flattened device trees
2328d321b81SPeter Tyser  /lzma			Library files to support LZMA decompression
2338d321b81SPeter Tyser  /lzo			Library files to support LZO decompression
2348d321b81SPeter Tyser/net			Networking code
2358d321b81SPeter Tyser/post			Power On Self Test
2368d321b81SPeter Tyser/rtc			Real Time Clock drivers
2378d321b81SPeter Tyser/tools			Tools to build S-Record or U-Boot images, etc.
238c609719bSwdenk
239c609719bSwdenkSoftware Configuration:
240c609719bSwdenk=======================
241c609719bSwdenk
242c609719bSwdenkConfiguration is usually done using C preprocessor defines; the
243c609719bSwdenkrationale behind that is to avoid dead code whenever possible.
244c609719bSwdenk
245c609719bSwdenkThere are two classes of configuration variables:
246c609719bSwdenk
247c609719bSwdenk* Configuration _OPTIONS_:
248c609719bSwdenk  These are selectable by the user and have names beginning with
249c609719bSwdenk  "CONFIG_".
250c609719bSwdenk
251c609719bSwdenk* Configuration _SETTINGS_:
252c609719bSwdenk  These depend on the hardware etc. and should not be meddled with if
253c609719bSwdenk  you don't know what you're doing; they have names beginning with
2546d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  "CONFIG_SYS_".
255c609719bSwdenk
256c609719bSwdenkLater we will add a configuration tool - probably similar to or even
257c609719bSwdenkidentical to what's used for the Linux kernel. Right now, we have to
258c609719bSwdenkdo the configuration by hand, which means creating some symbolic
259c609719bSwdenklinks and editing some configuration files. We use the TQM8xxL boards
260c609719bSwdenkas an example here.
261c609719bSwdenk
262c609719bSwdenk
263c609719bSwdenkSelection of Processor Architecture and Board Type:
264c609719bSwdenk---------------------------------------------------
265c609719bSwdenk
266c609719bSwdenkFor all supported boards there are ready-to-use default
267c609719bSwdenkconfigurations available; just type "make <board_name>_config".
268c609719bSwdenk
269c609719bSwdenkExample: For a TQM823L module type:
270c609719bSwdenk
271c609719bSwdenk	cd u-boot
272c609719bSwdenk	make TQM823L_config
273c609719bSwdenk
27411ccc33fSMarcel ZiswilerFor the Cogent platform, you need to specify the CPU type as well;
275c609719bSwdenke.g. "make cogent_mpc8xx_config". And also configure the cogent
276c609719bSwdenkdirectory according to the instructions in cogent/README.
277c609719bSwdenk
278c609719bSwdenk
279c609719bSwdenkConfiguration Options:
280c609719bSwdenk----------------------
281c609719bSwdenk
282c609719bSwdenkConfiguration depends on the combination of board and CPU type; all
283c609719bSwdenksuch information is kept in a configuration file
284c609719bSwdenk"include/configs/<board_name>.h".
285c609719bSwdenk
286c609719bSwdenkExample: For a TQM823L module, all configuration settings are in
287c609719bSwdenk"include/configs/TQM823L.h".
288c609719bSwdenk
289c609719bSwdenk
2907f6c2cbcSwdenkMany of the options are named exactly as the corresponding Linux
2917f6c2cbcSwdenkkernel configuration options. The intention is to make it easier to
2927f6c2cbcSwdenkbuild a config tool - later.
2937f6c2cbcSwdenk
2947f6c2cbcSwdenk
295c609719bSwdenkThe following options need to be configured:
296c609719bSwdenk
2972628114eSKim Phillips- CPU Type:	Define exactly one, e.g. CONFIG_MPC85XX.
298c609719bSwdenk
2992628114eSKim Phillips- Board Type:	Define exactly one, e.g. CONFIG_MPC8540ADS.
3006ccec449SWolfgang Denk
3016ccec449SWolfgang Denk- CPU Daughterboard Type: (if CONFIG_ATSTK1000 is defined)
30209ea0de0SHaavard Skinnemoen		Define exactly one, e.g. CONFIG_ATSTK1002
303c609719bSwdenk
304c609719bSwdenk- CPU Module Type: (if CONFIG_COGENT is defined)
305c609719bSwdenk		Define exactly one of
306c609719bSwdenk		CONFIG_CMA286_60_OLD
307c609719bSwdenk--- FIXME --- not tested yet:
308c609719bSwdenk		CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P,
309c609719bSwdenk		CONFIG_CMA287_23, CONFIG_CMA287_50
310c609719bSwdenk
311c609719bSwdenk- Motherboard Type: (if CONFIG_COGENT is defined)
312c609719bSwdenk		Define exactly one of
313c609719bSwdenk		CONFIG_CMA101, CONFIG_CMA102
314c609719bSwdenk
315c609719bSwdenk- Motherboard I/O Modules: (if CONFIG_COGENT is defined)
316c609719bSwdenk		Define one or more of
317c609719bSwdenk		CONFIG_CMA302
318c609719bSwdenk
319c609719bSwdenk- Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined)
320c609719bSwdenk		Define one or more of
321c609719bSwdenk		CONFIG_LCD_HEARTBEAT	- update a character position on
32211ccc33fSMarcel Ziswiler					  the LCD display every second with
323c609719bSwdenk					  a "rotator" |\-/|\-/
324c609719bSwdenk
3252535d602Swdenk- Board flavour: (if CONFIG_MPC8260ADS is defined)
3262535d602Swdenk		CONFIG_ADSTYPE
3272535d602Swdenk		Possible values are:
3286d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_8260ADS	- original MPC8260ADS
3296d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_8266ADS	- MPC8266ADS
3306d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_PQ2FADS	- PQ2FADS-ZU or PQ2FADS-VR
3316d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_8272ADS	- MPC8272ADS
3322535d602Swdenk
333cf946c6dSLei Wen- Marvell Family Member
334cf946c6dSLei Wen		CONFIG_SYS_MVFS		- define it if you want to enable
335cf946c6dSLei Wen					  multiple fs option at one time
336cf946c6dSLei Wen					  for marvell soc family
337cf946c6dSLei Wen
338c609719bSwdenk- MPC824X Family Member (if CONFIG_MPC824X is defined)
339c609719bSwdenk		Define exactly one of
340c609719bSwdenk		CONFIG_MPC8240, CONFIG_MPC8245
341c609719bSwdenk
34211ccc33fSMarcel Ziswiler- 8xx CPU Options: (if using an MPC8xx CPU)
34366ca92a5Swdenk		CONFIG_8xx_GCLK_FREQ	- deprecated: CPU clock if
34466ca92a5Swdenk					  get_gclk_freq() cannot work
3455da627a4Swdenk					  e.g. if there is no 32KHz
3465da627a4Swdenk					  reference PIT/RTC clock
34766ca92a5Swdenk		CONFIG_8xx_OSCLK	- PLL input clock (either EXTCLK
34866ca92a5Swdenk					  or XTAL/EXTAL)
349c609719bSwdenk
35066ca92a5Swdenk- 859/866/885 CPU options: (if using a MPC859 or MPC866 or MPC885 CPU):
3516d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_8xx_CPUCLK_MIN
3526d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_8xx_CPUCLK_MAX
35366ca92a5Swdenk		CONFIG_8xx_CPUCLK_DEFAULT
35475d1ea7fSwdenk			See doc/README.MPC866
35575d1ea7fSwdenk
3566d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_MEASURE_CPUCLK
35775d1ea7fSwdenk
35875d1ea7fSwdenk		Define this to measure the actual CPU clock instead
35975d1ea7fSwdenk		of relying on the correctness of the configured
36075d1ea7fSwdenk		values. Mostly useful for board bringup to make sure
36175d1ea7fSwdenk		the PLL is locked at the intended frequency. Note
36275d1ea7fSwdenk		that this requires a (stable) reference clock (32 kHz
3636d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		RTC clock or CONFIG_SYS_8XX_XIN)
36475d1ea7fSwdenk
365506f3918SHeiko Schocher		CONFIG_SYS_DELAYED_ICACHE
366506f3918SHeiko Schocher
367506f3918SHeiko Schocher		Define this option if you want to enable the
368506f3918SHeiko Schocher		ICache only when Code runs from RAM.
369506f3918SHeiko Schocher
37066412c63SKumar Gala- 85xx CPU Options:
371ffd06e02SYork Sun		CONFIG_SYS_PPC64
372ffd06e02SYork Sun
373ffd06e02SYork Sun		Specifies that the core is a 64-bit PowerPC implementation (implements
374ffd06e02SYork Sun		the "64" category of the Power ISA). This is necessary for ePAPR
375ffd06e02SYork Sun		compliance, among other possible reasons.
376ffd06e02SYork Sun
37766412c63SKumar Gala		CONFIG_SYS_FSL_TBCLK_DIV
37866412c63SKumar Gala
37966412c63SKumar Gala		Defines the core time base clock divider ratio compared to the
38066412c63SKumar Gala		system clock.  On most PQ3 devices this is 8, on newer QorIQ
38166412c63SKumar Gala		devices it can be 16 or 32.  The ratio varies from SoC to Soc.
38266412c63SKumar Gala
3838f29084aSKumar Gala		CONFIG_SYS_FSL_PCIE_COMPAT
3848f29084aSKumar Gala
3858f29084aSKumar Gala		Defines the string to utilize when trying to match PCIe device
3868f29084aSKumar Gala		tree nodes for the given platform.
3878f29084aSKumar Gala
388afa6b551SPrabhakar Kushwaha		CONFIG_SYS_PPC_E500_DEBUG_TLB
389afa6b551SPrabhakar Kushwaha
390afa6b551SPrabhakar Kushwaha		Enables a temporary TLB entry to be used during boot to work
391afa6b551SPrabhakar Kushwaha		around limitations in e500v1 and e500v2 external debugger
392afa6b551SPrabhakar Kushwaha		support. This reduces the portions of the boot code where
393afa6b551SPrabhakar Kushwaha		breakpoints and single stepping do not work.  The value of this
394afa6b551SPrabhakar Kushwaha		symbol should be set to the TLB1 entry to be used for this
395afa6b551SPrabhakar Kushwaha		purpose.
396afa6b551SPrabhakar Kushwaha
39733eee330SScott Wood		CONFIG_SYS_FSL_ERRATUM_A004510
39833eee330SScott Wood
39933eee330SScott Wood		Enables a workaround for erratum A004510.  If set,
40033eee330SScott Wood		then CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV and
40133eee330SScott Wood		CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY must be set.
40233eee330SScott Wood
40333eee330SScott Wood		CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV
40433eee330SScott Wood		CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV2 (optional)
40533eee330SScott Wood
40633eee330SScott Wood		Defines one or two SoC revisions (low 8 bits of SVR)
40733eee330SScott Wood		for which the A004510 workaround should be applied.
40833eee330SScott Wood
40933eee330SScott Wood		The rest of SVR is either not relevant to the decision
41033eee330SScott Wood		of whether the erratum is present (e.g. p2040 versus
41133eee330SScott Wood		p2041) or is implied by the build target, which controls
41233eee330SScott Wood		whether CONFIG_SYS_FSL_ERRATUM_A004510 is set.
41333eee330SScott Wood
41433eee330SScott Wood		See Freescale App Note 4493 for more information about
41533eee330SScott Wood		this erratum.
41633eee330SScott Wood
41733eee330SScott Wood		CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY
41833eee330SScott Wood
41933eee330SScott Wood		This is the value to write into CCSR offset 0x18600
42033eee330SScott Wood		according to the A004510 workaround.
42133eee330SScott Wood
4226cb461b4SDaniel Schwierzeck- Generic CPU options:
4236cb461b4SDaniel Schwierzeck		CONFIG_SYS_BIG_ENDIAN, CONFIG_SYS_LITTLE_ENDIAN
4246cb461b4SDaniel Schwierzeck
4256cb461b4SDaniel Schwierzeck		Defines the endianess of the CPU. Implementation of those
4266cb461b4SDaniel Schwierzeck		values is arch specific.
4276cb461b4SDaniel Schwierzeck
4280b953ffcSMarkus Klotzbuecher- Intel Monahans options:
4296d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO
4300b953ffcSMarkus Klotzbuecher
4310b953ffcSMarkus Klotzbuecher		Defines the Monahans run mode to oscillator
4320b953ffcSMarkus Klotzbuecher		ratio. Valid values are 8, 16, 24, 31. The core
4330b953ffcSMarkus Klotzbuecher		frequency is this value multiplied by 13 MHz.
4340b953ffcSMarkus Klotzbuecher
4356d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_MONAHANS_TURBO_RUN_MODE_RATIO
4360b953ffcSMarkus Klotzbuecher
4370b953ffcSMarkus Klotzbuecher		Defines the Monahans turbo mode to oscillator
4380b953ffcSMarkus Klotzbuecher		ratio. Valid values are 1 (default if undefined) and
4390b953ffcSMarkus Klotzbuecher		2. The core frequency as calculated above is multiplied
4400b953ffcSMarkus Klotzbuecher		by this value.
4410b953ffcSMarkus Klotzbuecher
44292bbd64eSDaniel Schwierzeck- MIPS CPU options:
44392bbd64eSDaniel Schwierzeck		CONFIG_SYS_INIT_SP_OFFSET
44492bbd64eSDaniel Schwierzeck
44592bbd64eSDaniel Schwierzeck		Offset relative to CONFIG_SYS_SDRAM_BASE for initial stack
44692bbd64eSDaniel Schwierzeck		pointer. This is needed for the temporary stack before
44792bbd64eSDaniel Schwierzeck		relocation.
44892bbd64eSDaniel Schwierzeck
44992bbd64eSDaniel Schwierzeck		CONFIG_SYS_MIPS_CACHE_MODE
45092bbd64eSDaniel Schwierzeck
45192bbd64eSDaniel Schwierzeck		Cache operation mode for the MIPS CPU.
45292bbd64eSDaniel Schwierzeck		See also arch/mips/include/asm/mipsregs.h.
45392bbd64eSDaniel Schwierzeck		Possible values are:
45492bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_NO_WA
45592bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_WA
45692bbd64eSDaniel Schwierzeck			CONF_CM_UNCACHED
45792bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_NONCOHERENT
45892bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_CE
45992bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_COW
46092bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_CUW
46192bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_ACCELERATED
46292bbd64eSDaniel Schwierzeck
46392bbd64eSDaniel Schwierzeck		CONFIG_SYS_XWAY_EBU_BOOTCFG
46492bbd64eSDaniel Schwierzeck
46592bbd64eSDaniel Schwierzeck		Special option for Lantiq XWAY SoCs for booting from NOR flash.
46692bbd64eSDaniel Schwierzeck		See also arch/mips/cpu/mips32/start.S.
46792bbd64eSDaniel Schwierzeck
46892bbd64eSDaniel Schwierzeck		CONFIG_XWAY_SWAP_BYTES
46992bbd64eSDaniel Schwierzeck
47092bbd64eSDaniel Schwierzeck		Enable compilation of tools/xway-swap-bytes needed for Lantiq
47192bbd64eSDaniel Schwierzeck		XWAY SoCs for booting from NOR flash. The U-Boot image needs to
47292bbd64eSDaniel Schwierzeck		be swapped if a flash programmer is used.
47392bbd64eSDaniel Schwierzeck
474b67d8816SChristian Riesch- ARM options:
475b67d8816SChristian Riesch		CONFIG_SYS_EXCEPTION_VECTORS_HIGH
476b67d8816SChristian Riesch
477b67d8816SChristian Riesch		Select high exception vectors of the ARM core, e.g., do not
478b67d8816SChristian Riesch		clear the V bit of the c1 register of CP15.
479b67d8816SChristian Riesch
4805356f545SAneesh V		CONFIG_SYS_THUMB_BUILD
4815356f545SAneesh V
4825356f545SAneesh V		Use this flag to build U-Boot using the Thumb instruction
4835356f545SAneesh V		set for ARM architectures. Thumb instruction set provides
4845356f545SAneesh V		better code density. For ARM architectures that support
4855356f545SAneesh V		Thumb2 this flag will result in Thumb2 code generated by
4865356f545SAneesh V		GCC.
4875356f545SAneesh V
4885da627a4Swdenk- Linux Kernel Interface:
489c609719bSwdenk		CONFIG_CLOCKS_IN_MHZ
490c609719bSwdenk
491c609719bSwdenk		U-Boot stores all clock information in Hz
492c609719bSwdenk		internally. For binary compatibility with older Linux
493c609719bSwdenk		kernels (which expect the clocks passed in the
494c609719bSwdenk		bd_info data to be in MHz) the environment variable
495c609719bSwdenk		"clocks_in_mhz" can be defined so that U-Boot
496c609719bSwdenk		converts clock data to MHZ before passing it to the
497c609719bSwdenk		Linux kernel.
498c609719bSwdenk		When CONFIG_CLOCKS_IN_MHZ is defined, a definition of
499c609719bSwdenk		"clocks_in_mhz=1" is automatically included in the
500c609719bSwdenk		default environment.
501c609719bSwdenk
5025da627a4Swdenk		CONFIG_MEMSIZE_IN_BYTES		[relevant for MIPS only]
5035da627a4Swdenk
50411ccc33fSMarcel Ziswiler		When transferring memsize parameter to linux, some versions
5055da627a4Swdenk		expect it to be in bytes, others in MB.
5065da627a4Swdenk		Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes.
5075da627a4Swdenk
508fec6d9eeSGerald Van Baren		CONFIG_OF_LIBFDT
509f57f70aaSWolfgang Denk
510f57f70aaSWolfgang Denk		New kernel versions are expecting firmware settings to be
511213bf8c8SGerald Van Baren		passed using flattened device trees (based on open firmware
512213bf8c8SGerald Van Baren		concepts).
513213bf8c8SGerald Van Baren
514213bf8c8SGerald Van Baren		CONFIG_OF_LIBFDT
515213bf8c8SGerald Van Baren		 * New libfdt-based support
516213bf8c8SGerald Van Baren		 * Adds the "fdt" command
5173bb342fcSKim Phillips		 * The bootm command automatically updates the fdt
518213bf8c8SGerald Van Baren
519b55ae402SMarcel Ziswiler		OF_CPU - The proper name of the cpus node (only required for
520b55ae402SMarcel Ziswiler			MPC512X and MPC5xxx based boards).
521b55ae402SMarcel Ziswiler		OF_SOC - The proper name of the soc node (only required for
522b55ae402SMarcel Ziswiler			MPC512X and MPC5xxx based boards).
523f57f70aaSWolfgang Denk		OF_TBCLK - The timebase frequency.
524c2871f03SKumar Gala		OF_STDOUT_PATH - The path to the console device
525f57f70aaSWolfgang Denk
52611ccc33fSMarcel Ziswiler		boards with QUICC Engines require OF_QE to set UCC MAC
52711ccc33fSMarcel Ziswiler		addresses
5283bb342fcSKim Phillips
5294e253137SKumar Gala		CONFIG_OF_BOARD_SETUP
5304e253137SKumar Gala
5314e253137SKumar Gala		Board code has addition modification that it wants to make
5324e253137SKumar Gala		to the flat device tree before handing it off to the kernel
5336705d81eSwdenk
5340267768eSMatthew McClintock		CONFIG_OF_BOOT_CPU
5350267768eSMatthew McClintock
53611ccc33fSMarcel Ziswiler		This define fills in the correct boot CPU in the boot
5370267768eSMatthew McClintock		param header, the default value is zero if undefined.
5380267768eSMatthew McClintock
5393887c3fbSHeiko Schocher		CONFIG_OF_IDE_FIXUP
5403887c3fbSHeiko Schocher
5413887c3fbSHeiko Schocher		U-Boot can detect if an IDE device is present or not.
5423887c3fbSHeiko Schocher		If not, and this new config option is activated, U-Boot
5433887c3fbSHeiko Schocher		removes the ATA node from the DTS before booting Linux,
5443887c3fbSHeiko Schocher		so the Linux IDE driver does not probe the device and
5453887c3fbSHeiko Schocher		crash. This is needed for buggy hardware (uc101) where
5463887c3fbSHeiko Schocher		no pull down resistor is connected to the signal IDE5V_DD7.
5473887c3fbSHeiko Schocher
5487eb29398SIgor Grinberg		CONFIG_MACH_TYPE	[relevant for ARM only][mandatory]
5497eb29398SIgor Grinberg
5507eb29398SIgor Grinberg		This setting is mandatory for all boards that have only one
5517eb29398SIgor Grinberg		machine type and must be used to specify the machine type
5527eb29398SIgor Grinberg		number as it appears in the ARM machine registry
5537eb29398SIgor Grinberg		(see http://www.arm.linux.org.uk/developer/machines/).
5547eb29398SIgor Grinberg		Only boards that have multiple machine types supported
5557eb29398SIgor Grinberg		in a single configuration file and the machine type is
5567eb29398SIgor Grinberg		runtime discoverable, do not have to use this setting.
5577eb29398SIgor Grinberg
5580b2f4ecaSNiklaus Giger- vxWorks boot parameters:
5590b2f4ecaSNiklaus Giger
5600b2f4ecaSNiklaus Giger		bootvx constructs a valid bootline using the following
5610b2f4ecaSNiklaus Giger		environments variables: bootfile, ipaddr, serverip, hostname.
5620b2f4ecaSNiklaus Giger		It loads the vxWorks image pointed bootfile.
5630b2f4ecaSNiklaus Giger
5640b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_BOOT_DEVICE - The vxworks device name
5650b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_MAC_PTR - Ethernet 6 byte MA -address
5660b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_SERVERNAME - Name of the server
5670b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_BOOT_ADDR - Address of boot parameters
5680b2f4ecaSNiklaus Giger
5690b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_ADD_PARAMS
5700b2f4ecaSNiklaus Giger
5710b2f4ecaSNiklaus Giger		Add it at the end of the bootline. E.g "u=username pw=secret"
5720b2f4ecaSNiklaus Giger
5730b2f4ecaSNiklaus Giger		Note: If a "bootargs" environment is defined, it will overwride
5740b2f4ecaSNiklaus Giger		the defaults discussed just above.
5750b2f4ecaSNiklaus Giger
5762c451f78SAneesh V- Cache Configuration:
5772c451f78SAneesh V		CONFIG_SYS_ICACHE_OFF - Do not enable instruction cache in U-Boot
5782c451f78SAneesh V		CONFIG_SYS_DCACHE_OFF - Do not enable data cache in U-Boot
5792c451f78SAneesh V		CONFIG_SYS_L2CACHE_OFF- Do not enable L2 cache in U-Boot
5802c451f78SAneesh V
58193bc2193SAneesh V- Cache Configuration for ARM:
58293bc2193SAneesh V		CONFIG_SYS_L2_PL310 - Enable support for ARM PL310 L2 cache
58393bc2193SAneesh V				      controller
58493bc2193SAneesh V		CONFIG_SYS_PL310_BASE - Physical base address of PL310
58593bc2193SAneesh V					controller register space
58693bc2193SAneesh V
5876705d81eSwdenk- Serial Ports:
58848d0192fSAndreas Engel		CONFIG_PL010_SERIAL
5896705d81eSwdenk
5906705d81eSwdenk		Define this if you want support for Amba PrimeCell PL010 UARTs.
5916705d81eSwdenk
59248d0192fSAndreas Engel		CONFIG_PL011_SERIAL
5936705d81eSwdenk
5946705d81eSwdenk		Define this if you want support for Amba PrimeCell PL011 UARTs.
5956705d81eSwdenk
5966705d81eSwdenk		CONFIG_PL011_CLOCK
5976705d81eSwdenk
5986705d81eSwdenk		If you have Amba PrimeCell PL011 UARTs, set this variable to
5996705d81eSwdenk		the clock speed of the UARTs.
6006705d81eSwdenk
6016705d81eSwdenk		CONFIG_PL01x_PORTS
6026705d81eSwdenk
6036705d81eSwdenk		If you have Amba PrimeCell PL010 or PL011 UARTs on your board,
6046705d81eSwdenk		define this to a list of base addresses for each (supported)
6056705d81eSwdenk		port. See e.g. include/configs/versatile.h
6066705d81eSwdenk
607910f1ae3SJohn Rigby		CONFIG_PL011_SERIAL_RLCR
608910f1ae3SJohn Rigby
609910f1ae3SJohn Rigby		Some vendor versions of PL011 serial ports (e.g. ST-Ericsson U8500)
610910f1ae3SJohn Rigby		have separate receive and transmit line control registers.  Set
611910f1ae3SJohn Rigby		this variable to initialize the extra register.
612910f1ae3SJohn Rigby
613910f1ae3SJohn Rigby		CONFIG_PL011_SERIAL_FLUSH_ON_INIT
614910f1ae3SJohn Rigby
615910f1ae3SJohn Rigby		On some platforms (e.g. U8500) U-Boot is loaded by a second stage
616910f1ae3SJohn Rigby		boot loader that has already initialized the UART.  Define this
617910f1ae3SJohn Rigby		variable to flush the UART at init time.
618910f1ae3SJohn Rigby
6196705d81eSwdenk
620c609719bSwdenk- Console Interface:
621c609719bSwdenk		Depending on board, define exactly one serial port
622c609719bSwdenk		(like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2,
623c609719bSwdenk		CONFIG_8xx_CONS_SCC1, ...), or switch off the serial
624c609719bSwdenk		console by defining CONFIG_8xx_CONS_NONE
625c609719bSwdenk
626c609719bSwdenk		Note: if CONFIG_8xx_CONS_NONE is defined, the serial
627c609719bSwdenk		port routines must be defined elsewhere
628c609719bSwdenk		(i.e. serial_init(), serial_getc(), ...)
629c609719bSwdenk
630c609719bSwdenk		CONFIG_CFB_CONSOLE
631c609719bSwdenk		Enables console device for a color framebuffer. Needs following
632c53043b7SWolfgang Denk		defines (cf. smiLynxEM, i8042)
633c609719bSwdenk			VIDEO_FB_LITTLE_ENDIAN	graphic memory organisation
634c609719bSwdenk						(default big endian)
635c609719bSwdenk			VIDEO_HW_RECTFILL	graphic chip supports
636c609719bSwdenk						rectangle fill
637c609719bSwdenk						(cf. smiLynxEM)
638c609719bSwdenk			VIDEO_HW_BITBLT		graphic chip supports
639c609719bSwdenk						bit-blit (cf. smiLynxEM)
640c609719bSwdenk			VIDEO_VISIBLE_COLS	visible pixel columns
641c609719bSwdenk						(cols=pitch)
642c609719bSwdenk			VIDEO_VISIBLE_ROWS	visible pixel rows
643c609719bSwdenk			VIDEO_PIXEL_SIZE	bytes per pixel
644c609719bSwdenk			VIDEO_DATA_FORMAT	graphic data format
645c609719bSwdenk						(0-5, cf. cfb_console.c)
646c609719bSwdenk			VIDEO_FB_ADRS		framebuffer address
647c609719bSwdenk			VIDEO_KBD_INIT_FCT	keyboard int fct
648c609719bSwdenk						(i.e. i8042_kbd_init())
649c609719bSwdenk			VIDEO_TSTC_FCT		test char fct
650c609719bSwdenk						(i.e. i8042_tstc)
651c609719bSwdenk			VIDEO_GETC_FCT		get char fct
652c609719bSwdenk						(i.e. i8042_getc)
653c609719bSwdenk			CONFIG_CONSOLE_CURSOR	cursor drawing on/off
654c609719bSwdenk						(requires blink timer
655c609719bSwdenk						cf. i8042.c)
6566d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c)
657c609719bSwdenk			CONFIG_CONSOLE_TIME	display time/date info in
658c609719bSwdenk						upper right corner
659602ad3b3SJon Loeliger						(requires CONFIG_CMD_DATE)
660c609719bSwdenk			CONFIG_VIDEO_LOGO	display Linux logo in
661c609719bSwdenk						upper left corner
662a6c7ad2fSwdenk			CONFIG_VIDEO_BMP_LOGO	use bmp_logo.h instead of
663a6c7ad2fSwdenk						linux_logo.h for logo.
664a6c7ad2fSwdenk						Requires CONFIG_VIDEO_LOGO
665c609719bSwdenk			CONFIG_CONSOLE_EXTRA_INFO
66611ccc33fSMarcel Ziswiler						additional board info beside
667c609719bSwdenk						the logo
668c609719bSwdenk
66933a35bbbSPali Rohár		When CONFIG_CFB_CONSOLE_ANSI is defined, console will support
67033a35bbbSPali Rohár		a limited number of ANSI escape sequences (cursor control,
67133a35bbbSPali Rohár		erase functions and limited graphics rendition control).
67233a35bbbSPali Rohár
673c609719bSwdenk		When CONFIG_CFB_CONSOLE is defined, video console is
674c609719bSwdenk		default i/o. Serial console can be forced with
675c609719bSwdenk		environment 'console=serial'.
676c609719bSwdenk
677a3ad8e26Swdenk		When CONFIG_SILENT_CONSOLE is defined, all console
678a3ad8e26Swdenk		messages (by U-Boot and Linux!) can be silenced with
679a3ad8e26Swdenk		the "silent" environment variable. See
680a3ad8e26Swdenk		doc/README.silent for more information.
681a3ad8e26Swdenk
682c609719bSwdenk- Console Baudrate:
683c609719bSwdenk		CONFIG_BAUDRATE - in bps
684c609719bSwdenk		Select one of the baudrates listed in
6856d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BAUDRATE_TABLE, see below.
6866d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BRGCLK_PRESCALE, baudrate prescale
687c609719bSwdenk
688c92fac91SHeiko Schocher- Console Rx buffer length
689c92fac91SHeiko Schocher		With CONFIG_SYS_SMC_RXBUFLEN it is possible to define
690c92fac91SHeiko Schocher		the maximum receive buffer length for the SMC.
6912b3f12c2SHeiko Schocher		This option is actual only for 82xx and 8xx possible.
692c92fac91SHeiko Schocher		If using CONFIG_SYS_SMC_RXBUFLEN also CONFIG_SYS_MAXIDLE
693c92fac91SHeiko Schocher		must be defined, to setup the maximum idle timeout for
694c92fac91SHeiko Schocher		the SMC.
695c92fac91SHeiko Schocher
6969558b48aSGraeme Russ- Pre-Console Buffer:
6979558b48aSGraeme Russ		Prior to the console being initialised (i.e. serial UART
6989558b48aSGraeme Russ		initialised etc) all console output is silently discarded.
6999558b48aSGraeme Russ		Defining CONFIG_PRE_CONSOLE_BUFFER will cause U-Boot to
7009558b48aSGraeme Russ		buffer any console messages prior to the console being
7019558b48aSGraeme Russ		initialised to a buffer of size CONFIG_PRE_CON_BUF_SZ
7029558b48aSGraeme Russ		bytes located at CONFIG_PRE_CON_BUF_ADDR. The buffer is
7039558b48aSGraeme Russ		a circular buffer, so if more than CONFIG_PRE_CON_BUF_SZ
7049558b48aSGraeme Russ		bytes are output before the console is initialised, the
7059558b48aSGraeme Russ		earlier bytes are discarded.
7069558b48aSGraeme Russ
7079558b48aSGraeme Russ		'Sane' compilers will generate smaller code if
7089558b48aSGraeme Russ		CONFIG_PRE_CON_BUF_SZ is a power of 2
7099558b48aSGraeme Russ
710046a37bdSSonny Rao- Safe printf() functions
711046a37bdSSonny Rao		Define CONFIG_SYS_VSNPRINTF to compile in safe versions of
712046a37bdSSonny Rao		the printf() functions. These are defined in
713046a37bdSSonny Rao		include/vsprintf.h and include snprintf(), vsnprintf() and
714046a37bdSSonny Rao		so on. Code size increase is approximately 300-500 bytes.
715046a37bdSSonny Rao		If this option is not given then these functions will
716046a37bdSSonny Rao		silently discard their buffer size argument - this means
717046a37bdSSonny Rao		you are not getting any overflow checking in this case.
718046a37bdSSonny Rao
719c609719bSwdenk- Boot Delay:	CONFIG_BOOTDELAY - in seconds
720c609719bSwdenk		Delay before automatically booting the default image;
721c609719bSwdenk		set to -1 to disable autoboot.
72293d7212fSJoe Hershberger		set to -2 to autoboot with no delay and not check for abort
72393d7212fSJoe Hershberger		(even when CONFIG_ZERO_BOOTDELAY_CHECK is defined).
724c609719bSwdenk
725c609719bSwdenk		See doc/README.autoboot for these options that
726c609719bSwdenk		work with CONFIG_BOOTDELAY. None are required.
727c609719bSwdenk		CONFIG_BOOT_RETRY_TIME
728c609719bSwdenk		CONFIG_BOOT_RETRY_MIN
729c609719bSwdenk		CONFIG_AUTOBOOT_KEYED
730c609719bSwdenk		CONFIG_AUTOBOOT_PROMPT
731c609719bSwdenk		CONFIG_AUTOBOOT_DELAY_STR
732c609719bSwdenk		CONFIG_AUTOBOOT_STOP_STR
733c609719bSwdenk		CONFIG_AUTOBOOT_DELAY_STR2
734c609719bSwdenk		CONFIG_AUTOBOOT_STOP_STR2
735c609719bSwdenk		CONFIG_ZERO_BOOTDELAY_CHECK
736c609719bSwdenk		CONFIG_RESET_TO_RETRY
737c609719bSwdenk
738c609719bSwdenk- Autoboot Command:
739c609719bSwdenk		CONFIG_BOOTCOMMAND
740c609719bSwdenk		Only needed when CONFIG_BOOTDELAY is enabled;
741c609719bSwdenk		define a command string that is automatically executed
742c609719bSwdenk		when no character is read on the console interface
743c609719bSwdenk		within "Boot Delay" after reset.
744c609719bSwdenk
745c609719bSwdenk		CONFIG_BOOTARGS
746c609719bSwdenk		This can be used to pass arguments to the bootm
747c609719bSwdenk		command. The value of CONFIG_BOOTARGS goes into the
748c609719bSwdenk		environment value "bootargs".
749c609719bSwdenk
750c609719bSwdenk		CONFIG_RAMBOOT and CONFIG_NFSBOOT
751c609719bSwdenk		The value of these goes into the environment as
752c609719bSwdenk		"ramboot" and "nfsboot" respectively, and can be used
753c609719bSwdenk		as a convenience, when switching between booting from
75411ccc33fSMarcel Ziswiler		RAM and NFS.
755c609719bSwdenk
756c609719bSwdenk- Pre-Boot Commands:
757c609719bSwdenk		CONFIG_PREBOOT
758c609719bSwdenk
759c609719bSwdenk		When this option is #defined, the existence of the
760c609719bSwdenk		environment variable "preboot" will be checked
761c609719bSwdenk		immediately before starting the CONFIG_BOOTDELAY
762c609719bSwdenk		countdown and/or running the auto-boot command resp.
763c609719bSwdenk		entering interactive mode.
764c609719bSwdenk
765c609719bSwdenk		This feature is especially useful when "preboot" is
766c609719bSwdenk		automatically generated or modified. For an example
767c609719bSwdenk		see the LWMON board specific code: here "preboot" is
768c609719bSwdenk		modified when the user holds down a certain
769c609719bSwdenk		combination of keys on the (special) keyboard when
770c609719bSwdenk		booting the systems
771c609719bSwdenk
772c609719bSwdenk- Serial Download Echo Mode:
773c609719bSwdenk		CONFIG_LOADS_ECHO
774c609719bSwdenk		If defined to 1, all characters received during a
775c609719bSwdenk		serial download (using the "loads" command) are
776c609719bSwdenk		echoed back. This might be needed by some terminal
777c609719bSwdenk		emulations (like "cu"), but may as well just take
778c609719bSwdenk		time on others. This setting #define's the initial
779c609719bSwdenk		value of the "loads_echo" environment variable.
780c609719bSwdenk
781602ad3b3SJon Loeliger- Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined)
782c609719bSwdenk		CONFIG_KGDB_BAUDRATE
783c609719bSwdenk		Select one of the baudrates listed in
7846d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BAUDRATE_TABLE, see below.
785c609719bSwdenk
786c609719bSwdenk- Monitor Functions:
787602ad3b3SJon Loeliger		Monitor commands can be included or excluded
788602ad3b3SJon Loeliger		from the build by using the #include files
789c6c621bdSStephen Warren		<config_cmd_all.h> and #undef'ing unwanted
790c6c621bdSStephen Warren		commands, or using <config_cmd_default.h>
791602ad3b3SJon Loeliger		and augmenting with additional #define's
792602ad3b3SJon Loeliger		for wanted commands.
793c609719bSwdenk
794602ad3b3SJon Loeliger		The default command configuration includes all commands
795602ad3b3SJon Loeliger		except those marked below with a "*".
796602ad3b3SJon Loeliger
797602ad3b3SJon Loeliger		CONFIG_CMD_ASKENV	* ask for env variable
798602ad3b3SJon Loeliger		CONFIG_CMD_BDI		  bdinfo
799602ad3b3SJon Loeliger		CONFIG_CMD_BEDBUG	* Include BedBug Debugger
800602ad3b3SJon Loeliger		CONFIG_CMD_BMP		* BMP support
801602ad3b3SJon Loeliger		CONFIG_CMD_BSP		* Board specific commands
802602ad3b3SJon Loeliger		CONFIG_CMD_BOOTD	  bootd
803602ad3b3SJon Loeliger		CONFIG_CMD_CACHE	* icache, dcache
804602ad3b3SJon Loeliger		CONFIG_CMD_CONSOLE	  coninfo
805710b9938SMike Frysinger		CONFIG_CMD_CRC32	* crc32
806602ad3b3SJon Loeliger		CONFIG_CMD_DATE		* support for RTC, date/time...
807602ad3b3SJon Loeliger		CONFIG_CMD_DHCP		* DHCP support
808602ad3b3SJon Loeliger		CONFIG_CMD_DIAG		* Diagnostics
809a7c93104SPeter Tyser		CONFIG_CMD_DS4510	* ds4510 I2C gpio commands
810a7c93104SPeter Tyser		CONFIG_CMD_DS4510_INFO	* ds4510 I2C info command
811a7c93104SPeter Tyser		CONFIG_CMD_DS4510_MEM	* ds4510 I2C eeprom/sram commansd
812a7c93104SPeter Tyser		CONFIG_CMD_DS4510_RST	* ds4510 I2C rst command
813602ad3b3SJon Loeliger		CONFIG_CMD_DTT		* Digital Therm and Thermostat
814602ad3b3SJon Loeliger		CONFIG_CMD_ECHO		  echo arguments
815246c6922SPeter Tyser		CONFIG_CMD_EDITENV	  edit env variable
816602ad3b3SJon Loeliger		CONFIG_CMD_EEPROM	* EEPROM read/write support
817602ad3b3SJon Loeliger		CONFIG_CMD_ELF		* bootelf, bootvx
8180c79cda0SMike Frysinger		CONFIG_CMD_EXPORTENV	* export the environment
81903e2ecf6SStephen Warren		CONFIG_CMD_EXT2		* ext2 command support
82003e2ecf6SStephen Warren		CONFIG_CMD_EXT4		* ext4 command support
821bdab39d3SMike Frysinger		CONFIG_CMD_SAVEENV	  saveenv
822602ad3b3SJon Loeliger		CONFIG_CMD_FDC		* Floppy Disk Support
82303e2ecf6SStephen Warren		CONFIG_CMD_FAT		* FAT command support
824602ad3b3SJon Loeliger		CONFIG_CMD_FDOS		* Dos diskette Support
825602ad3b3SJon Loeliger		CONFIG_CMD_FLASH	  flinfo, erase, protect
826602ad3b3SJon Loeliger		CONFIG_CMD_FPGA		  FPGA device initialization support
827*53fdc7efSAnton Staaf		CONFIG_CMD_GETTIME	* Get time since boot
828a641b979SMike Frysinger		CONFIG_CMD_GO		* the 'go' command (exec code)
829a000b795SKim Phillips		CONFIG_CMD_GREPENV	* search environment
830602ad3b3SJon Loeliger		CONFIG_CMD_HWFLOW	* RTS/CTS hw flow control
831602ad3b3SJon Loeliger		CONFIG_CMD_I2C		* I2C serial bus support
832602ad3b3SJon Loeliger		CONFIG_CMD_IDE		* IDE harddisk support
833602ad3b3SJon Loeliger		CONFIG_CMD_IMI		  iminfo
834602ad3b3SJon Loeliger		CONFIG_CMD_IMLS		  List all found images
835602ad3b3SJon Loeliger		CONFIG_CMD_IMMAP	* IMMR dump support
8360c79cda0SMike Frysinger		CONFIG_CMD_IMPORTENV	* import an environment
837c167cc02SJoe Hershberger		CONFIG_CMD_INI		* import data from an ini file into the env
838602ad3b3SJon Loeliger		CONFIG_CMD_IRQ		* irqinfo
839602ad3b3SJon Loeliger		CONFIG_CMD_ITEST	  Integer/string test of 2 values
840602ad3b3SJon Loeliger		CONFIG_CMD_JFFS2	* JFFS2 Support
841602ad3b3SJon Loeliger		CONFIG_CMD_KGDB		* kgdb
8421ba7fd25SMike Frysinger		CONFIG_CMD_LDRINFO	  ldrinfo (display Blackfin loader)
843d22c338eSJoe Hershberger		CONFIG_CMD_LINK_LOCAL	* link-local IP address auto-configuration
844d22c338eSJoe Hershberger					  (169.254.*.*)
845602ad3b3SJon Loeliger		CONFIG_CMD_LOADB	  loadb
846602ad3b3SJon Loeliger		CONFIG_CMD_LOADS	  loads
84702c9aa1dSRobin Getz		CONFIG_CMD_MD5SUM	  print md5 message digest
84802c9aa1dSRobin Getz					  (requires CONFIG_CMD_MEMORY and CONFIG_MD5)
849602ad3b3SJon Loeliger		CONFIG_CMD_MEMORY	  md, mm, nm, mw, cp, cmp, crc, base,
85056523f12Swdenk					  loop, loopw, mtest
851602ad3b3SJon Loeliger		CONFIG_CMD_MISC		  Misc functions like sleep etc
852602ad3b3SJon Loeliger		CONFIG_CMD_MMC		* MMC memory mapped support
853602ad3b3SJon Loeliger		CONFIG_CMD_MII		* MII utility commands
85468d7d651SStefan Roese		CONFIG_CMD_MTDPARTS	* MTD partition support
855602ad3b3SJon Loeliger		CONFIG_CMD_NAND		* NAND support
856602ad3b3SJon Loeliger		CONFIG_CMD_NET		  bootp, tftpboot, rarpboot
857e92739d3SPeter Tyser		CONFIG_CMD_PCA953X	* PCA953x I2C gpio commands
858e92739d3SPeter Tyser		CONFIG_CMD_PCA953X_INFO * PCA953x I2C gpio info command
859602ad3b3SJon Loeliger		CONFIG_CMD_PCI		* pciinfo
860602ad3b3SJon Loeliger		CONFIG_CMD_PCMCIA		* PCMCIA support
861602ad3b3SJon Loeliger		CONFIG_CMD_PING		* send ICMP ECHO_REQUEST to network
862602ad3b3SJon Loeliger					  host
863602ad3b3SJon Loeliger		CONFIG_CMD_PORTIO	* Port I/O
864602ad3b3SJon Loeliger		CONFIG_CMD_REGINFO	* Register dump
865602ad3b3SJon Loeliger		CONFIG_CMD_RUN		  run command in env variable
866602ad3b3SJon Loeliger		CONFIG_CMD_SAVES	* save S record dump
867602ad3b3SJon Loeliger		CONFIG_CMD_SCSI		* SCSI Support
868602ad3b3SJon Loeliger		CONFIG_CMD_SDRAM	* print SDRAM configuration information
869602ad3b3SJon Loeliger					  (requires CONFIG_CMD_I2C)
870602ad3b3SJon Loeliger		CONFIG_CMD_SETGETDCR	  Support for DCR Register access
871602ad3b3SJon Loeliger					  (4xx only)
872f61ec45eSEric Nelson		CONFIG_CMD_SF		* Read/write/erase SPI NOR flash
873c6b1ee66SAlexander Holler		CONFIG_CMD_SHA1SUM	  print sha1 memory digest
87402c9aa1dSRobin Getz					  (requires CONFIG_CMD_MEMORY)
87574de7aefSWolfgang Denk		CONFIG_CMD_SOURCE	  "source" command Support
876602ad3b3SJon Loeliger		CONFIG_CMD_SPI		* SPI serial bus support
8777a83af07SLuca Ceresoli		CONFIG_CMD_TFTPSRV	* TFTP transfer in server mode
8781fb7cd49SSimon Glass		CONFIG_CMD_TFTPPUT	* TFTP put command (upload)
879da83bcd7SJoe Hershberger		CONFIG_CMD_TIME		* run command and report execution time (ARM specific)
880da83bcd7SJoe Hershberger		CONFIG_CMD_TIMER	* access to the system tick timer
881602ad3b3SJon Loeliger		CONFIG_CMD_USB		* USB support
882602ad3b3SJon Loeliger		CONFIG_CMD_CDP		* Cisco Discover Protocol support
883c8339f51SMarek Vasut		CONFIG_CMD_MFSL		* Microblaze FSL support
884c609719bSwdenk
885c609719bSwdenk
886c609719bSwdenk		EXAMPLE: If you want all functions except of network
887c609719bSwdenk		support you can write:
888c609719bSwdenk
889602ad3b3SJon Loeliger		#include "config_cmd_all.h"
890602ad3b3SJon Loeliger		#undef CONFIG_CMD_NET
891c609719bSwdenk
892213bf8c8SGerald Van Baren	Other Commands:
893213bf8c8SGerald Van Baren		fdt (flattened device tree) command: CONFIG_OF_LIBFDT
894c609719bSwdenk
895c609719bSwdenk	Note:	Don't enable the "icache" and "dcache" commands
896602ad3b3SJon Loeliger		(configuration option CONFIG_CMD_CACHE) unless you know
897c609719bSwdenk		what you (and your U-Boot users) are doing. Data
898c609719bSwdenk		cache cannot be enabled on systems like the 8xx or
899c609719bSwdenk		8260 (where accesses to the IMMR region must be
900c609719bSwdenk		uncached), and it cannot be disabled on all other
901c609719bSwdenk		systems where we (mis-) use the data cache to hold an
902c609719bSwdenk		initial stack and some data.
903c609719bSwdenk
904c609719bSwdenk
905c609719bSwdenk		XXX - this list needs to get updated!
906c609719bSwdenk
90745ba8077SSimon Glass- Device tree:
90845ba8077SSimon Glass		CONFIG_OF_CONTROL
90945ba8077SSimon Glass		If this variable is defined, U-Boot will use a device tree
91045ba8077SSimon Glass		to configure its devices, instead of relying on statically
91145ba8077SSimon Glass		compiled #defines in the board file. This option is
91245ba8077SSimon Glass		experimental and only available on a few boards. The device
91345ba8077SSimon Glass		tree is available in the global data as gd->fdt_blob.
91445ba8077SSimon Glass
9152c0f79e4SSimon Glass		U-Boot needs to get its device tree from somewhere. This can
9162c0f79e4SSimon Glass		be done using one of the two options below:
917bbb0b128SSimon Glass
918bbb0b128SSimon Glass		CONFIG_OF_EMBED
919bbb0b128SSimon Glass		If this variable is defined, U-Boot will embed a device tree
920bbb0b128SSimon Glass		binary in its image. This device tree file should be in the
921bbb0b128SSimon Glass		board directory and called <soc>-<board>.dts. The binary file
922bbb0b128SSimon Glass		is then picked up in board_init_f() and made available through
923bbb0b128SSimon Glass		the global data structure as gd->blob.
92445ba8077SSimon Glass
9252c0f79e4SSimon Glass		CONFIG_OF_SEPARATE
9262c0f79e4SSimon Glass		If this variable is defined, U-Boot will build a device tree
9272c0f79e4SSimon Glass		binary. It will be called u-boot.dtb. Architecture-specific
9282c0f79e4SSimon Glass		code will locate it at run-time. Generally this works by:
9292c0f79e4SSimon Glass
9302c0f79e4SSimon Glass			cat u-boot.bin u-boot.dtb >image.bin
9312c0f79e4SSimon Glass
9322c0f79e4SSimon Glass		and in fact, U-Boot does this for you, creating a file called
9332c0f79e4SSimon Glass		u-boot-dtb.bin which is useful in the common case. You can
9342c0f79e4SSimon Glass		still use the individual files if you need something more
9352c0f79e4SSimon Glass		exotic.
9362c0f79e4SSimon Glass
937c609719bSwdenk- Watchdog:
938c609719bSwdenk		CONFIG_WATCHDOG
939c609719bSwdenk		If this variable is defined, it enables watchdog
9406abe6fb6SDetlev Zundel		support for the SoC. There must be support in the SoC
9416abe6fb6SDetlev Zundel		specific code for a watchdog. For the 8xx and 8260
9426abe6fb6SDetlev Zundel		CPUs, the SIU Watchdog feature is enabled in the SYPCR
9436abe6fb6SDetlev Zundel		register.  When supported for a specific SoC is
9446abe6fb6SDetlev Zundel		available, then no further board specific code should
9456abe6fb6SDetlev Zundel		be needed to use it.
9466abe6fb6SDetlev Zundel
9476abe6fb6SDetlev Zundel		CONFIG_HW_WATCHDOG
9486abe6fb6SDetlev Zundel		When using a watchdog circuitry external to the used
9496abe6fb6SDetlev Zundel		SoC, then define this variable and provide board
9506abe6fb6SDetlev Zundel		specific code for the "hw_watchdog_reset" function.
951c609719bSwdenk
952c1551ea8Sstroese- U-Boot Version:
953c1551ea8Sstroese		CONFIG_VERSION_VARIABLE
954c1551ea8Sstroese		If this variable is defined, an environment variable
955c1551ea8Sstroese		named "ver" is created by U-Boot showing the U-Boot
956c1551ea8Sstroese		version as printed by the "version" command.
957a1ea8e51SBenoît Thébaudeau		Any change to this variable will be reverted at the
958a1ea8e51SBenoît Thébaudeau		next reset.
959c1551ea8Sstroese
960c609719bSwdenk- Real-Time Clock:
961c609719bSwdenk
962602ad3b3SJon Loeliger		When CONFIG_CMD_DATE is selected, the type of the RTC
963c609719bSwdenk		has to be selected, too. Define exactly one of the
964c609719bSwdenk		following options:
965c609719bSwdenk
966c609719bSwdenk		CONFIG_RTC_MPC8xx	- use internal RTC of MPC8xx
967c609719bSwdenk		CONFIG_RTC_PCF8563	- use Philips PCF8563 RTC
9684e8b7544SFabio Estevam		CONFIG_RTC_MC13XXX	- use MC13783 or MC13892 RTC
969c609719bSwdenk		CONFIG_RTC_MC146818	- use MC146818 RTC
9701cb8e980Swdenk		CONFIG_RTC_DS1307	- use Maxim, Inc. DS1307 RTC
971c609719bSwdenk		CONFIG_RTC_DS1337	- use Maxim, Inc. DS1337 RTC
9727f70e853Swdenk		CONFIG_RTC_DS1338	- use Maxim, Inc. DS1338 RTC
9733bac3513Swdenk		CONFIG_RTC_DS164x	- use Dallas DS164x RTC
9749536dfccSTor Krill		CONFIG_RTC_ISL1208	- use Intersil ISL1208 RTC
9754c0d4c3bSwdenk		CONFIG_RTC_MAX6900	- use Maxim, Inc. MAX6900 RTC
9766d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_RTC_DS1337_NOOSC	- Turn off the OSC output for DS1337
97771d19f30SHeiko Schocher		CONFIG_SYS_RV3029_TCR	- enable trickle charger on
97871d19f30SHeiko Schocher					  RV3029 RTC.
979c609719bSwdenk
980b37c7e5eSwdenk		Note that if the RTC uses I2C, then the I2C interface
981b37c7e5eSwdenk		must also be configured. See I2C Support, below.
982b37c7e5eSwdenk
983e92739d3SPeter Tyser- GPIO Support:
984e92739d3SPeter Tyser		CONFIG_PCA953X		- use NXP's PCA953X series I2C GPIO
985e92739d3SPeter Tyser		CONFIG_PCA953X_INFO	- enable pca953x info command
986e92739d3SPeter Tyser
9875dec49caSChris Packham		The CONFIG_SYS_I2C_PCA953X_WIDTH option specifies a list of
9885dec49caSChris Packham		chip-ngpio pairs that tell the PCA953X driver the number of
9895dec49caSChris Packham		pins supported by a particular chip.
9905dec49caSChris Packham
991e92739d3SPeter Tyser		Note that if the GPIO device uses I2C, then the I2C interface
992e92739d3SPeter Tyser		must also be configured. See I2C Support, below.
993e92739d3SPeter Tyser
994c609719bSwdenk- Timestamp Support:
995c609719bSwdenk
996c609719bSwdenk		When CONFIG_TIMESTAMP is selected, the timestamp
997c609719bSwdenk		(date and time) of an image is printed by image
998c609719bSwdenk		commands like bootm or iminfo. This option is
999602ad3b3SJon Loeliger		automatically enabled when you select CONFIG_CMD_DATE .
1000c609719bSwdenk
1001923c46f9SKarl O. Pinc- Partition Labels (disklabels) Supported:
1002923c46f9SKarl O. Pinc		Zero or more of the following:
1003923c46f9SKarl O. Pinc		CONFIG_MAC_PARTITION   Apple's MacOS partition table.
1004923c46f9SKarl O. Pinc		CONFIG_DOS_PARTITION   MS Dos partition table, traditional on the
1005923c46f9SKarl O. Pinc				       Intel architecture, USB sticks, etc.
1006923c46f9SKarl O. Pinc		CONFIG_ISO_PARTITION   ISO partition table, used on CDROM etc.
1007923c46f9SKarl O. Pinc		CONFIG_EFI_PARTITION   GPT partition table, common when EFI is the
1008923c46f9SKarl O. Pinc				       bootloader.  Note 2TB partition limit; see
1009923c46f9SKarl O. Pinc				       disk/part_efi.c
1010923c46f9SKarl O. Pinc		CONFIG_MTD_PARTITIONS  Memory Technology Device partition table.
1011c609719bSwdenk
1012602ad3b3SJon Loeliger		If IDE or SCSI support is enabled (CONFIG_CMD_IDE or
1013218ca724SWolfgang Denk		CONFIG_CMD_SCSI) you must configure support for at
1014923c46f9SKarl O. Pinc		least one non-MTD partition type as well.
1015c609719bSwdenk
1016c609719bSwdenk- IDE Reset method:
10174d13cbadSwdenk		CONFIG_IDE_RESET_ROUTINE - this is defined in several
10184d13cbadSwdenk		board configurations files but used nowhere!
1019c609719bSwdenk
10204d13cbadSwdenk		CONFIG_IDE_RESET - is this is defined, IDE Reset will
10214d13cbadSwdenk		be performed by calling the function
10224d13cbadSwdenk			ide_set_reset(int reset)
10234d13cbadSwdenk		which has to be defined in a board specific file
1024c609719bSwdenk
1025c609719bSwdenk- ATAPI Support:
1026c609719bSwdenk		CONFIG_ATAPI
1027c609719bSwdenk
1028c609719bSwdenk		Set this to enable ATAPI support.
1029c609719bSwdenk
1030c40b2956Swdenk- LBA48 Support
1031c40b2956Swdenk		CONFIG_LBA48
1032c40b2956Swdenk
1033c40b2956Swdenk		Set this to enable support for disks larger than 137GB
10344b142febSHeiko Schocher		Also look at CONFIG_SYS_64BIT_LBA.
1035c40b2956Swdenk		Whithout these , LBA48 support uses 32bit variables and will 'only'
1036c40b2956Swdenk		support disks up to 2.1TB.
1037c40b2956Swdenk
10386d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_64BIT_LBA:
1039c40b2956Swdenk			When enabled, makes the IDE subsystem use 64bit sector addresses.
1040c40b2956Swdenk			Default is 32bit.
1041c40b2956Swdenk
1042c609719bSwdenk- SCSI Support:
1043c609719bSwdenk		At the moment only there is only support for the
1044c609719bSwdenk		SYM53C8XX SCSI controller; define
1045c609719bSwdenk		CONFIG_SCSI_SYM53C8XX to enable it.
1046c609719bSwdenk
10476d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_LUN [8], CONFIG_SYS_SCSI_MAX_SCSI_ID [7] and
10486d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_DEVICE [CONFIG_SYS_SCSI_MAX_SCSI_ID *
10496d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_LUN] can be adjusted to define the
1050c609719bSwdenk		maximum numbers of LUNs, SCSI ID's and target
1051c609719bSwdenk		devices.
10526d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz)
1053c609719bSwdenk
1054447c031bSStefan Reinauer                The environment variable 'scsidevs' is set to the number of
1055447c031bSStefan Reinauer                SCSI devices found during the last scan.
1056447c031bSStefan Reinauer
1057c609719bSwdenk- NETWORK Support (PCI):
1058682011ffSwdenk		CONFIG_E1000
1059ce5207e1SKyle Moffett		Support for Intel 8254x/8257x gigabit chips.
1060ce5207e1SKyle Moffett
1061ce5207e1SKyle Moffett		CONFIG_E1000_SPI
1062ce5207e1SKyle Moffett		Utility code for direct access to the SPI bus on Intel 8257x.
1063ce5207e1SKyle Moffett		This does not do anything useful unless you set at least one
1064ce5207e1SKyle Moffett		of CONFIG_CMD_E1000 or CONFIG_E1000_SPI_GENERIC.
1065ce5207e1SKyle Moffett
1066ce5207e1SKyle Moffett		CONFIG_E1000_SPI_GENERIC
1067ce5207e1SKyle Moffett		Allow generic access to the SPI bus on the Intel 8257x, for
1068ce5207e1SKyle Moffett		example with the "sspi" command.
1069ce5207e1SKyle Moffett
1070ce5207e1SKyle Moffett		CONFIG_CMD_E1000
1071ce5207e1SKyle Moffett		Management command for E1000 devices.  When used on devices
1072ce5207e1SKyle Moffett		with SPI support you can reprogram the EEPROM from U-Boot.
1073682011ffSwdenk
1074ac3315c2SAndre Schwarz		CONFIG_E1000_FALLBACK_MAC
107511ccc33fSMarcel Ziswiler		default MAC for empty EEPROM after production.
1076ac3315c2SAndre Schwarz
1077c609719bSwdenk		CONFIG_EEPRO100
1078c609719bSwdenk		Support for Intel 82557/82559/82559ER chips.
107911ccc33fSMarcel Ziswiler		Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM
1080c609719bSwdenk		write routine for first time initialisation.
1081c609719bSwdenk
1082c609719bSwdenk		CONFIG_TULIP
1083c609719bSwdenk		Support for Digital 2114x chips.
1084c609719bSwdenk		Optional CONFIG_TULIP_SELECT_MEDIA for board specific
1085c609719bSwdenk		modem chip initialisation (KS8761/QS6611).
1086c609719bSwdenk
1087c609719bSwdenk		CONFIG_NATSEMI
1088c609719bSwdenk		Support for National dp83815 chips.
1089c609719bSwdenk
1090c609719bSwdenk		CONFIG_NS8382X
1091c609719bSwdenk		Support for National dp8382[01] gigabit chips.
1092c609719bSwdenk
109345219c46Swdenk- NETWORK Support (other):
109445219c46Swdenk
1095c041e9d2SJens Scharsig		CONFIG_DRIVER_AT91EMAC
1096c041e9d2SJens Scharsig		Support for AT91RM9200 EMAC.
1097c041e9d2SJens Scharsig
1098c041e9d2SJens Scharsig			CONFIG_RMII
1099c041e9d2SJens Scharsig			Define this to use reduced MII inteface
1100c041e9d2SJens Scharsig
1101c041e9d2SJens Scharsig			CONFIG_DRIVER_AT91EMAC_QUIET
1102c041e9d2SJens Scharsig			If this defined, the driver is quiet.
1103c041e9d2SJens Scharsig			The driver doen't show link status messages.
1104c041e9d2SJens Scharsig
1105efdd7319SRob Herring		CONFIG_CALXEDA_XGMAC
1106efdd7319SRob Herring		Support for the Calxeda XGMAC device
1107efdd7319SRob Herring
11083bb46d23SAshok		CONFIG_LAN91C96
110945219c46Swdenk		Support for SMSC's LAN91C96 chips.
111045219c46Swdenk
111145219c46Swdenk			CONFIG_LAN91C96_BASE
111245219c46Swdenk			Define this to hold the physical address
111345219c46Swdenk			of the LAN91C96's I/O space
111445219c46Swdenk
111545219c46Swdenk			CONFIG_LAN91C96_USE_32_BIT
111645219c46Swdenk			Define this to enable 32 bit addressing
111745219c46Swdenk
11183bb46d23SAshok		CONFIG_SMC91111
1119f39748aeSwdenk		Support for SMSC's LAN91C111 chip
1120f39748aeSwdenk
1121f39748aeSwdenk			CONFIG_SMC91111_BASE
1122f39748aeSwdenk			Define this to hold the physical address
1123f39748aeSwdenk			of the device (I/O space)
1124f39748aeSwdenk
1125f39748aeSwdenk			CONFIG_SMC_USE_32_BIT
1126f39748aeSwdenk			Define this if data bus is 32 bits
1127f39748aeSwdenk
1128f39748aeSwdenk			CONFIG_SMC_USE_IOFUNCS
1129f39748aeSwdenk			Define this to use i/o functions instead of macros
1130f39748aeSwdenk			(some hardware wont work with macros)
1131f39748aeSwdenk
1132dc02badaSHeiko Schocher		CONFIG_DRIVER_TI_EMAC
1133dc02badaSHeiko Schocher		Support for davinci emac
1134dc02badaSHeiko Schocher
1135dc02badaSHeiko Schocher			CONFIG_SYS_DAVINCI_EMAC_PHY_COUNT
1136dc02badaSHeiko Schocher			Define this if you have more then 3 PHYs.
1137dc02badaSHeiko Schocher
1138b3dbf4a5SMacpaul Lin		CONFIG_FTGMAC100
1139b3dbf4a5SMacpaul Lin		Support for Faraday's FTGMAC100 Gigabit SoC Ethernet
1140b3dbf4a5SMacpaul Lin
1141b3dbf4a5SMacpaul Lin			CONFIG_FTGMAC100_EGIGA
1142b3dbf4a5SMacpaul Lin			Define this to use GE link update with gigabit PHY.
1143b3dbf4a5SMacpaul Lin			Define this if FTGMAC100 is connected to gigabit PHY.
1144b3dbf4a5SMacpaul Lin			If your system has 10/100 PHY only, it might not occur
1145b3dbf4a5SMacpaul Lin			wrong behavior. Because PHY usually return timeout or
1146b3dbf4a5SMacpaul Lin			useless data when polling gigabit status and gigabit
1147b3dbf4a5SMacpaul Lin			control registers. This behavior won't affect the
1148b3dbf4a5SMacpaul Lin			correctnessof 10/100 link speed update.
1149b3dbf4a5SMacpaul Lin
1150c2fff331SMike Rapoport		CONFIG_SMC911X
1151557b377dSJens Gehrlein		Support for SMSC's LAN911x and LAN921x chips
1152557b377dSJens Gehrlein
1153c2fff331SMike Rapoport			CONFIG_SMC911X_BASE
1154557b377dSJens Gehrlein			Define this to hold the physical address
1155557b377dSJens Gehrlein			of the device (I/O space)
1156557b377dSJens Gehrlein
1157c2fff331SMike Rapoport			CONFIG_SMC911X_32_BIT
1158557b377dSJens Gehrlein			Define this if data bus is 32 bits
1159557b377dSJens Gehrlein
1160c2fff331SMike Rapoport			CONFIG_SMC911X_16_BIT
1161557b377dSJens Gehrlein			Define this if data bus is 16 bits. If your processor
1162557b377dSJens Gehrlein			automatically converts one 32 bit word to two 16 bit
1163c2fff331SMike Rapoport			words you may also try CONFIG_SMC911X_32_BIT.
1164557b377dSJens Gehrlein
11653d0075faSYoshihiro Shimoda		CONFIG_SH_ETHER
11663d0075faSYoshihiro Shimoda		Support for Renesas on-chip Ethernet controller
11673d0075faSYoshihiro Shimoda
11683d0075faSYoshihiro Shimoda			CONFIG_SH_ETHER_USE_PORT
11693d0075faSYoshihiro Shimoda			Define the number of ports to be used
11703d0075faSYoshihiro Shimoda
11713d0075faSYoshihiro Shimoda			CONFIG_SH_ETHER_PHY_ADDR
11723d0075faSYoshihiro Shimoda			Define the ETH PHY's address
11733d0075faSYoshihiro Shimoda
117468260aabSYoshihiro Shimoda			CONFIG_SH_ETHER_CACHE_WRITEBACK
117568260aabSYoshihiro Shimoda			If this option is set, the driver enables cache flush.
117668260aabSYoshihiro Shimoda
11775e124724SVadim Bendebury- TPM Support:
11785e124724SVadim Bendebury		CONFIG_GENERIC_LPC_TPM
11795e124724SVadim Bendebury		Support for generic parallel port TPM devices. Only one device
11805e124724SVadim Bendebury		per system is supported at this time.
11815e124724SVadim Bendebury
11825e124724SVadim Bendebury			CONFIG_TPM_TIS_BASE_ADDRESS
11835e124724SVadim Bendebury			Base address where the generic TPM device is mapped
11845e124724SVadim Bendebury			to. Contemporary x86 systems usually map it at
11855e124724SVadim Bendebury			0xfed40000.
11865e124724SVadim Bendebury
1187c609719bSwdenk- USB Support:
1188c609719bSwdenk		At the moment only the UHCI host controller is
11894d13cbadSwdenk		supported (PIP405, MIP405, MPC5200); define
1190c609719bSwdenk		CONFIG_USB_UHCI to enable it.
1191c609719bSwdenk		define CONFIG_USB_KEYBOARD to enable the USB Keyboard
119230d56faeSwdenk		and define CONFIG_USB_STORAGE to enable the USB
1193c609719bSwdenk		storage devices.
1194c609719bSwdenk		Note:
1195c609719bSwdenk		Supported are USB Keyboards and USB Floppy drives
1196c609719bSwdenk		(TEAC FD-05PUB).
11974d13cbadSwdenk		MPC5200 USB requires additional defines:
11984d13cbadSwdenk			CONFIG_USB_CLOCK
11994d13cbadSwdenk				for 528 MHz Clock: 0x0001bbbb
1200307ecb6dSEric Millbrandt			CONFIG_PSC3_USB
1201307ecb6dSEric Millbrandt				for USB on PSC3
12024d13cbadSwdenk			CONFIG_USB_CONFIG
12034d13cbadSwdenk				for differential drivers: 0x00001000
12044d13cbadSwdenk				for single ended drivers: 0x00005000
1205307ecb6dSEric Millbrandt				for differential drivers on PSC3: 0x00000100
1206307ecb6dSEric Millbrandt				for single ended drivers on PSC3: 0x00004100
12076d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_USB_EVENT_POLL
1208fdcfaa1bSZhang Wei				May be defined to allow interrupt polling
1209fdcfaa1bSZhang Wei				instead of using asynchronous interrupts
12104d13cbadSwdenk
12119ab4ce22SSimon Glass		CONFIG_USB_EHCI_TXFIFO_THRESH enables setting of the
12129ab4ce22SSimon Glass		txfilltuning field in the EHCI controller on reset.
12139ab4ce22SSimon Glass
121416c8d5e7SWolfgang Denk- USB Device:
121516c8d5e7SWolfgang Denk		Define the below if you wish to use the USB console.
121616c8d5e7SWolfgang Denk		Once firmware is rebuilt from a serial console issue the
121716c8d5e7SWolfgang Denk		command "setenv stdin usbtty; setenv stdout usbtty" and
121811ccc33fSMarcel Ziswiler		attach your USB cable. The Unix command "dmesg" should print
121916c8d5e7SWolfgang Denk		it has found a new device. The environment variable usbtty
122016c8d5e7SWolfgang Denk		can be set to gserial or cdc_acm to enable your device to
122116c8d5e7SWolfgang Denk		appear to a USB host as a Linux gserial device or a
122216c8d5e7SWolfgang Denk		Common Device Class Abstract Control Model serial device.
122316c8d5e7SWolfgang Denk		If you select usbtty = gserial you should be able to enumerate
122416c8d5e7SWolfgang Denk		a Linux host by
122516c8d5e7SWolfgang Denk		# modprobe usbserial vendor=0xVendorID product=0xProductID
122616c8d5e7SWolfgang Denk		else if using cdc_acm, simply setting the environment
122716c8d5e7SWolfgang Denk		variable usbtty to be cdc_acm should suffice. The following
122816c8d5e7SWolfgang Denk		might be defined in YourBoardName.h
122916c8d5e7SWolfgang Denk
123016c8d5e7SWolfgang Denk			CONFIG_USB_DEVICE
123116c8d5e7SWolfgang Denk			Define this to build a UDC device
123216c8d5e7SWolfgang Denk
123316c8d5e7SWolfgang Denk			CONFIG_USB_TTY
123416c8d5e7SWolfgang Denk			Define this to have a tty type of device available to
123516c8d5e7SWolfgang Denk			talk to the UDC device
123616c8d5e7SWolfgang Denk
1237f9da0f89SVipin KUMAR			CONFIG_USBD_HS
1238f9da0f89SVipin KUMAR			Define this to enable the high speed support for usb
1239f9da0f89SVipin KUMAR			device and usbtty. If this feature is enabled, a routine
1240f9da0f89SVipin KUMAR			int is_usbd_high_speed(void)
1241f9da0f89SVipin KUMAR			also needs to be defined by the driver to dynamically poll
1242f9da0f89SVipin KUMAR			whether the enumeration has succeded at high speed or full
1243f9da0f89SVipin KUMAR			speed.
1244f9da0f89SVipin KUMAR
12456d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_CONSOLE_IS_IN_ENV
124616c8d5e7SWolfgang Denk			Define this if you want stdin, stdout &/or stderr to
124716c8d5e7SWolfgang Denk			be set to usbtty.
124816c8d5e7SWolfgang Denk
124916c8d5e7SWolfgang Denk			mpc8xx:
12506d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				CONFIG_SYS_USB_EXTC_CLK 0xBLAH
125116c8d5e7SWolfgang Denk				Derive USB clock from external clock "blah"
12526d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				- CONFIG_SYS_USB_EXTC_CLK 0x02
125316c8d5e7SWolfgang Denk
12546d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				CONFIG_SYS_USB_BRG_CLK 0xBLAH
125516c8d5e7SWolfgang Denk				Derive USB clock from brgclk
12566d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				- CONFIG_SYS_USB_BRG_CLK 0x04
125716c8d5e7SWolfgang Denk
125816c8d5e7SWolfgang Denk		If you have a USB-IF assigned VendorID then you may wish to
125916c8d5e7SWolfgang Denk		define your own vendor specific values either in BoardName.h
126016c8d5e7SWolfgang Denk		or directly in usbd_vendor_info.h. If you don't define
126116c8d5e7SWolfgang Denk		CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME,
126216c8d5e7SWolfgang Denk		CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot
126316c8d5e7SWolfgang Denk		should pretend to be a Linux device to it's target host.
126416c8d5e7SWolfgang Denk
126516c8d5e7SWolfgang Denk			CONFIG_USBD_MANUFACTURER
126616c8d5e7SWolfgang Denk			Define this string as the name of your company for
126716c8d5e7SWolfgang Denk			- CONFIG_USBD_MANUFACTURER "my company"
126816c8d5e7SWolfgang Denk
126916c8d5e7SWolfgang Denk			CONFIG_USBD_PRODUCT_NAME
127016c8d5e7SWolfgang Denk			Define this string as the name of your product
127116c8d5e7SWolfgang Denk			- CONFIG_USBD_PRODUCT_NAME "acme usb device"
127216c8d5e7SWolfgang Denk
127316c8d5e7SWolfgang Denk			CONFIG_USBD_VENDORID
127416c8d5e7SWolfgang Denk			Define this as your assigned Vendor ID from the USB
127516c8d5e7SWolfgang Denk			Implementors Forum. This *must* be a genuine Vendor ID
127616c8d5e7SWolfgang Denk			to avoid polluting the USB namespace.
127716c8d5e7SWolfgang Denk			- CONFIG_USBD_VENDORID 0xFFFF
127816c8d5e7SWolfgang Denk
127916c8d5e7SWolfgang Denk			CONFIG_USBD_PRODUCTID
128016c8d5e7SWolfgang Denk			Define this as the unique Product ID
128116c8d5e7SWolfgang Denk			for your device
128216c8d5e7SWolfgang Denk			- CONFIG_USBD_PRODUCTID 0xFFFF
1283c609719bSwdenk
1284d70a560fSIgor Grinberg- ULPI Layer Support:
1285d70a560fSIgor Grinberg		The ULPI (UTMI Low Pin (count) Interface) PHYs are supported via
1286d70a560fSIgor Grinberg		the generic ULPI layer. The generic layer accesses the ULPI PHY
1287d70a560fSIgor Grinberg		via the platform viewport, so you need both the genric layer and
1288d70a560fSIgor Grinberg		the viewport enabled. Currently only Chipidea/ARC based
1289d70a560fSIgor Grinberg		viewport is supported.
1290d70a560fSIgor Grinberg		To enable the ULPI layer support, define CONFIG_USB_ULPI and
1291d70a560fSIgor Grinberg		CONFIG_USB_ULPI_VIEWPORT in your board configuration file.
12926d365ea0SLucas Stach		If your ULPI phy needs a different reference clock than the
12936d365ea0SLucas Stach		standard 24 MHz then you have to define CONFIG_ULPI_REF_CLK to
12946d365ea0SLucas Stach		the appropriate value in Hz.
1295c609719bSwdenk
1296c609719bSwdenk- MMC Support:
1297c609719bSwdenk		The MMC controller on the Intel PXA is supported. To
1298c609719bSwdenk		enable this define CONFIG_MMC. The MMC can be
1299c609719bSwdenk		accessed from the boot prompt by mapping the device
1300c609719bSwdenk		to physical memory similar to flash. Command line is
1301602ad3b3SJon Loeliger		enabled with CONFIG_CMD_MMC. The MMC driver also works with
1302602ad3b3SJon Loeliger		the FAT fs. This is enabled with CONFIG_CMD_FAT.
1303c609719bSwdenk
1304afb35666SYoshihiro Shimoda		CONFIG_SH_MMCIF
1305afb35666SYoshihiro Shimoda		Support for Renesas on-chip MMCIF controller
1306afb35666SYoshihiro Shimoda
1307afb35666SYoshihiro Shimoda			CONFIG_SH_MMCIF_ADDR
1308afb35666SYoshihiro Shimoda			Define the base address of MMCIF registers
1309afb35666SYoshihiro Shimoda
1310afb35666SYoshihiro Shimoda			CONFIG_SH_MMCIF_CLK
1311afb35666SYoshihiro Shimoda			Define the clock frequency for MMCIF
1312afb35666SYoshihiro Shimoda
13136705d81eSwdenk- Journaling Flash filesystem support:
13146705d81eSwdenk		CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE,
13156705d81eSwdenk		CONFIG_JFFS2_NAND_DEV
13166705d81eSwdenk		Define these for a default partition on a NAND device
13176705d81eSwdenk
13186d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS2_FIRST_SECTOR,
13196d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS2_FIRST_BANK, CONFIG_SYS_JFFS2_NUM_BANKS
13206705d81eSwdenk		Define these for a default partition on a NOR device
13216705d81eSwdenk
13226d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS_CUSTOM_PART
13236705d81eSwdenk		Define this to create an own partition. You have to provide a
13246705d81eSwdenk		function struct part_info* jffs2_part_info(int part_num)
13256705d81eSwdenk
13266705d81eSwdenk		If you define only one JFFS2 partition you may also want to
13276d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		#define CONFIG_SYS_JFFS_SINGLE_PART	1
13286705d81eSwdenk		to disable the command chpart. This is the default when you
13296705d81eSwdenk		have not defined a custom partition
13306705d81eSwdenk
1331c30a15e5SDonggeun Kim- FAT(File Allocation Table) filesystem write function support:
1332c30a15e5SDonggeun Kim		CONFIG_FAT_WRITE
1333656f4c65SDonggeun Kim
1334656f4c65SDonggeun Kim		Define this to enable support for saving memory data as a
1335656f4c65SDonggeun Kim		file in FAT formatted partition.
1336656f4c65SDonggeun Kim
1337656f4c65SDonggeun Kim		This will also enable the command "fatwrite" enabling the
1338656f4c65SDonggeun Kim		user to write files to FAT.
1339c30a15e5SDonggeun Kim
134084cd9327SGabe BlackCBFS (Coreboot Filesystem) support
134184cd9327SGabe Black		CONFIG_CMD_CBFS
134284cd9327SGabe Black
134384cd9327SGabe Black		Define this to enable support for reading from a Coreboot
134484cd9327SGabe Black		filesystem. Available commands are cbfsinit, cbfsinfo, cbfsls
134584cd9327SGabe Black		and cbfsload.
134684cd9327SGabe Black
1347c609719bSwdenk- Keyboard Support:
1348c609719bSwdenk		CONFIG_ISA_KEYBOARD
1349c609719bSwdenk
1350c609719bSwdenk		Define this to enable standard (PC-Style) keyboard
1351c609719bSwdenk		support
1352c609719bSwdenk
1353c609719bSwdenk		CONFIG_I8042_KBD
1354c609719bSwdenk		Standard PC keyboard driver with US (is default) and
1355c609719bSwdenk		GERMAN key layout (switch via environment 'keymap=de') support.
1356c609719bSwdenk		Export function i8042_kbd_init, i8042_tstc and i8042_getc
1357c609719bSwdenk		for cfb_console. Supports cursor blinking.
1358c609719bSwdenk
1359c609719bSwdenk- Video support:
1360c609719bSwdenk		CONFIG_VIDEO
1361c609719bSwdenk
1362c609719bSwdenk		Define this to enable video support (for output to
1363c609719bSwdenk		video).
1364c609719bSwdenk
1365c609719bSwdenk		CONFIG_VIDEO_CT69000
1366c609719bSwdenk
1367c609719bSwdenk		Enable Chips & Technologies 69000 Video chip
1368c609719bSwdenk
1369c609719bSwdenk		CONFIG_VIDEO_SMI_LYNXEM
1370eeb1b77bSwdenk		Enable Silicon Motion SMI 712/710/810 Video chip. The
1371eeb1b77bSwdenk		video output is selected via environment 'videoout'
1372eeb1b77bSwdenk		(1 = LCD and 2 = CRT). If videoout is undefined, CRT is
1373eeb1b77bSwdenk		assumed.
1374c609719bSwdenk
1375eeb1b77bSwdenk		For the CT69000 and SMI_LYNXEM drivers, videomode is
137611ccc33fSMarcel Ziswiler		selected via environment 'videomode'. Two different ways
1377eeb1b77bSwdenk		are possible:
1378eeb1b77bSwdenk		- "videomode=num"   'num' is a standard LiLo mode numbers.
1379eeb1b77bSwdenk		Following standard modes are supported	(* is default):
1380eeb1b77bSwdenk
1381eeb1b77bSwdenk		      Colors	640x480 800x600 1024x768 1152x864 1280x1024
1382eeb1b77bSwdenk		-------------+---------------------------------------------
1383eeb1b77bSwdenk		      8 bits |	0x301*	0x303	 0x305	  0x161	    0x307
1384eeb1b77bSwdenk		     15 bits |	0x310	0x313	 0x316	  0x162	    0x319
1385eeb1b77bSwdenk		     16 bits |	0x311	0x314	 0x317	  0x163	    0x31A
1386eeb1b77bSwdenk		     24 bits |	0x312	0x315	 0x318	    ?	    0x31B
1387eeb1b77bSwdenk		-------------+---------------------------------------------
1388c609719bSwdenk		(i.e. setenv videomode 317; saveenv; reset;)
1389c609719bSwdenk
1390eeb1b77bSwdenk		- "videomode=bootargs" all the video parameters are parsed
13917817cb20SMarcel Ziswiler		from the bootargs. (See drivers/video/videomodes.c)
1392eeb1b77bSwdenk
1393eeb1b77bSwdenk
1394a6c7ad2fSwdenk		CONFIG_VIDEO_SED13806
1395a6c7ad2fSwdenk		Enable Epson SED13806 driver. This driver supports 8bpp
1396a6c7ad2fSwdenk		and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP
1397a6c7ad2fSwdenk		or CONFIG_VIDEO_SED13806_16BPP
1398a6c7ad2fSwdenk
13997d3053fbSTimur Tabi		CONFIG_FSL_DIU_FB
14007d3053fbSTimur Tabi		Enable the Freescale DIU video driver.	Reference boards for
14017d3053fbSTimur Tabi		SOCs that have a DIU should define this macro to enable DIU
14027d3053fbSTimur Tabi		support, and should also define these other macros:
14037d3053fbSTimur Tabi
14047d3053fbSTimur Tabi			CONFIG_SYS_DIU_ADDR
14057d3053fbSTimur Tabi			CONFIG_VIDEO
14067d3053fbSTimur Tabi			CONFIG_CMD_BMP
14077d3053fbSTimur Tabi			CONFIG_CFB_CONSOLE
14087d3053fbSTimur Tabi			CONFIG_VIDEO_SW_CURSOR
14097d3053fbSTimur Tabi			CONFIG_VGA_AS_SINGLE_DEVICE
14107d3053fbSTimur Tabi			CONFIG_VIDEO_LOGO
14117d3053fbSTimur Tabi			CONFIG_VIDEO_BMP_LOGO
14127d3053fbSTimur Tabi
1413ba8e76bdSTimur Tabi		The DIU driver will look for the 'video-mode' environment
1414ba8e76bdSTimur Tabi		variable, and if defined, enable the DIU as a console during
1415ba8e76bdSTimur Tabi		boot.  See the documentation file README.video for a
1416ba8e76bdSTimur Tabi		description of this variable.
14177d3053fbSTimur Tabi
1418058d59b0SSimon Glass		CONFIG_VIDEO_VGA
1419058d59b0SSimon Glass
1420058d59b0SSimon Glass		Enable the VGA video / BIOS for x86. The alternative if you
1421058d59b0SSimon Glass		are using coreboot is to use the coreboot frame buffer
1422058d59b0SSimon Glass		driver.
1423058d59b0SSimon Glass
1424058d59b0SSimon Glass
1425682011ffSwdenk- Keyboard Support:
1426682011ffSwdenk		CONFIG_KEYBOARD
1427682011ffSwdenk
1428682011ffSwdenk		Define this to enable a custom keyboard support.
1429682011ffSwdenk		This simply calls drv_keyboard_init() which must be
1430682011ffSwdenk		defined in your board-specific files.
1431682011ffSwdenk		The only board using this so far is RBC823.
1432a6c7ad2fSwdenk
1433c609719bSwdenk- LCD Support:	CONFIG_LCD
1434c609719bSwdenk
1435c609719bSwdenk		Define this to enable LCD support (for output to LCD
1436c609719bSwdenk		display); also select one of the supported displays
1437c609719bSwdenk		by defining one of these:
1438c609719bSwdenk
143939cf4804SStelian Pop		CONFIG_ATMEL_LCD:
144039cf4804SStelian Pop
144139cf4804SStelian Pop			HITACHI TX09D70VM1CCA, 3.5", 240x320.
144239cf4804SStelian Pop
1443fd3103bbSwdenk		CONFIG_NEC_NL6448AC33:
1444c609719bSwdenk
1445fd3103bbSwdenk			NEC NL6448AC33-18. Active, color, single scan.
1446c609719bSwdenk
1447fd3103bbSwdenk		CONFIG_NEC_NL6448BC20
1448c609719bSwdenk
1449fd3103bbSwdenk			NEC NL6448BC20-08. 6.5", 640x480.
1450fd3103bbSwdenk			Active, color, single scan.
1451fd3103bbSwdenk
1452fd3103bbSwdenk		CONFIG_NEC_NL6448BC33_54
1453fd3103bbSwdenk
1454fd3103bbSwdenk			NEC NL6448BC33-54. 10.4", 640x480.
1455c609719bSwdenk			Active, color, single scan.
1456c609719bSwdenk
1457c609719bSwdenk		CONFIG_SHARP_16x9
1458c609719bSwdenk
1459c609719bSwdenk			Sharp 320x240. Active, color, single scan.
1460c609719bSwdenk			It isn't 16x9, and I am not sure what it is.
1461c609719bSwdenk
1462c609719bSwdenk		CONFIG_SHARP_LQ64D341
1463c609719bSwdenk
1464c609719bSwdenk			Sharp LQ64D341 display, 640x480.
1465c609719bSwdenk			Active, color, single scan.
1466c609719bSwdenk
1467c609719bSwdenk		CONFIG_HLD1045
1468c609719bSwdenk
1469c609719bSwdenk			HLD1045 display, 640x480.
1470c609719bSwdenk			Active, color, single scan.
1471c609719bSwdenk
1472c609719bSwdenk		CONFIG_OPTREX_BW
1473c609719bSwdenk
1474c609719bSwdenk			Optrex	 CBL50840-2 NF-FW 99 22 M5
1475c609719bSwdenk			or
1476c609719bSwdenk			Hitachi	 LMG6912RPFC-00T
1477c609719bSwdenk			or
1478c609719bSwdenk			Hitachi	 SP14Q002
1479c609719bSwdenk
1480c609719bSwdenk			320x240. Black & white.
1481c609719bSwdenk
1482c609719bSwdenk		Normally display is black on white background; define
14836d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_WHITE_ON_BLACK to get it inverted.
1484c609719bSwdenk
148545d7f525STom Wai-Hong Tam		CONFIG_LCD_BMP_RLE8
148645d7f525STom Wai-Hong Tam
148745d7f525STom Wai-Hong Tam		Support drawing of RLE8-compressed bitmaps on the LCD.
148845d7f525STom Wai-Hong Tam
148945d7f525STom Wai-Hong Tam
14907152b1d0Swdenk- Splash Screen Support: CONFIG_SPLASH_SCREEN
1491d791b1dcSwdenk
1492d791b1dcSwdenk		If this option is set, the environment is checked for
1493d791b1dcSwdenk		a variable "splashimage". If found, the usual display
1494d791b1dcSwdenk		of logo, copyright and system information on the LCD
1495e94d2cd9Swdenk		is suppressed and the BMP image at the address
1496d791b1dcSwdenk		specified in "splashimage" is loaded instead. The
1497d791b1dcSwdenk		console is redirected to the "nulldev", too. This
1498d791b1dcSwdenk		allows for a "silent" boot where a splash screen is
1499d791b1dcSwdenk		loaded very quickly after power-on.
1500d791b1dcSwdenk
15011ca298ceSMatthias Weisser		CONFIG_SPLASH_SCREEN_ALIGN
15021ca298ceSMatthias Weisser
15031ca298ceSMatthias Weisser		If this option is set the splash image can be freely positioned
15041ca298ceSMatthias Weisser		on the screen. Environment variable "splashpos" specifies the
15051ca298ceSMatthias Weisser		position as "x,y". If a positive number is given it is used as
15061ca298ceSMatthias Weisser		number of pixel from left/top. If a negative number is given it
15071ca298ceSMatthias Weisser		is used as number of pixel from right/bottom. You can also
15081ca298ceSMatthias Weisser		specify 'm' for centering the image.
15091ca298ceSMatthias Weisser
15101ca298ceSMatthias Weisser		Example:
15111ca298ceSMatthias Weisser		setenv splashpos m,m
15121ca298ceSMatthias Weisser			=> image at center of screen
15131ca298ceSMatthias Weisser
15141ca298ceSMatthias Weisser		setenv splashpos 30,20
15151ca298ceSMatthias Weisser			=> image at x = 30 and y = 20
15161ca298ceSMatthias Weisser
15171ca298ceSMatthias Weisser		setenv splashpos -10,m
15181ca298ceSMatthias Weisser			=> vertically centered image
15191ca298ceSMatthias Weisser			   at x = dspWidth - bmpWidth - 9
15201ca298ceSMatthias Weisser
152198f4a3dfSStefan Roese- Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP
152298f4a3dfSStefan Roese
152398f4a3dfSStefan Roese		If this option is set, additionally to standard BMP
152498f4a3dfSStefan Roese		images, gzipped BMP images can be displayed via the
152598f4a3dfSStefan Roese		splashscreen support or the bmp command.
152698f4a3dfSStefan Roese
1527d5011762SAnatolij Gustschin- Run length encoded BMP image (RLE8) support: CONFIG_VIDEO_BMP_RLE8
1528d5011762SAnatolij Gustschin
1529d5011762SAnatolij Gustschin		If this option is set, 8-bit RLE compressed BMP images
1530d5011762SAnatolij Gustschin		can be displayed via the splashscreen support or the
1531d5011762SAnatolij Gustschin		bmp command.
1532d5011762SAnatolij Gustschin
1533f2b96dfbSLei Wen- Do compresssing for memory range:
1534f2b96dfbSLei Wen		CONFIG_CMD_ZIP
1535f2b96dfbSLei Wen
1536f2b96dfbSLei Wen		If this option is set, it would use zlib deflate method
1537f2b96dfbSLei Wen		to compress the specified memory at its best effort.
1538f2b96dfbSLei Wen
1539c29fdfc1Swdenk- Compression support:
1540c29fdfc1Swdenk		CONFIG_BZIP2
1541c29fdfc1Swdenk
1542c29fdfc1Swdenk		If this option is set, support for bzip2 compressed
1543c29fdfc1Swdenk		images is included. If not, only uncompressed and gzip
1544c29fdfc1Swdenk		compressed images are supported.
1545c29fdfc1Swdenk
1546c29fdfc1Swdenk		NOTE: the bzip2 algorithm requires a lot of RAM, so
15476d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		the malloc area (as defined by CONFIG_SYS_MALLOC_LEN) should
1548c29fdfc1Swdenk		be at least 4MB.
1549d791b1dcSwdenk
1550fc9c1727SLuigi 'Comio' Mantellini		CONFIG_LZMA
1551fc9c1727SLuigi 'Comio' Mantellini
1552fc9c1727SLuigi 'Comio' Mantellini		If this option is set, support for lzma compressed
1553fc9c1727SLuigi 'Comio' Mantellini		images is included.
1554fc9c1727SLuigi 'Comio' Mantellini
1555fc9c1727SLuigi 'Comio' Mantellini		Note: The LZMA algorithm adds between 2 and 4KB of code and it
1556fc9c1727SLuigi 'Comio' Mantellini		requires an amount of dynamic memory that is given by the
1557fc9c1727SLuigi 'Comio' Mantellini		formula:
1558fc9c1727SLuigi 'Comio' Mantellini
1559fc9c1727SLuigi 'Comio' Mantellini			(1846 + 768 << (lc + lp)) * sizeof(uint16)
1560fc9c1727SLuigi 'Comio' Mantellini
1561fc9c1727SLuigi 'Comio' Mantellini		Where lc and lp stand for, respectively, Literal context bits
1562fc9c1727SLuigi 'Comio' Mantellini		and Literal pos bits.
1563fc9c1727SLuigi 'Comio' Mantellini
1564fc9c1727SLuigi 'Comio' Mantellini		This value is upper-bounded by 14MB in the worst case. Anyway,
1565fc9c1727SLuigi 'Comio' Mantellini		for a ~4MB large kernel image, we have lc=3 and lp=0 for a
1566fc9c1727SLuigi 'Comio' Mantellini		total amount of (1846 + 768 << (3 + 0)) * 2 = ~41KB... that is
1567fc9c1727SLuigi 'Comio' Mantellini		a very small buffer.
1568fc9c1727SLuigi 'Comio' Mantellini
1569fc9c1727SLuigi 'Comio' Mantellini		Use the lzmainfo tool to determinate the lc and lp values and
1570fc9c1727SLuigi 'Comio' Mantellini		then calculate the amount of needed dynamic memory (ensuring
15716d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		the appropriate CONFIG_SYS_MALLOC_LEN value).
1572fc9c1727SLuigi 'Comio' Mantellini
157317ea1177Swdenk- MII/PHY support:
157417ea1177Swdenk		CONFIG_PHY_ADDR
157517ea1177Swdenk
157617ea1177Swdenk		The address of PHY on MII bus.
157717ea1177Swdenk
157817ea1177Swdenk		CONFIG_PHY_CLOCK_FREQ (ppc4xx)
157917ea1177Swdenk
158017ea1177Swdenk		The clock frequency of the MII bus
158117ea1177Swdenk
158217ea1177Swdenk		CONFIG_PHY_GIGE
158317ea1177Swdenk
158417ea1177Swdenk		If this option is set, support for speed/duplex
158511ccc33fSMarcel Ziswiler		detection of gigabit PHY is included.
158617ea1177Swdenk
158717ea1177Swdenk		CONFIG_PHY_RESET_DELAY
158817ea1177Swdenk
158917ea1177Swdenk		Some PHY like Intel LXT971A need extra delay after
159017ea1177Swdenk		reset before any MII register access is possible.
159117ea1177Swdenk		For such PHY, set this option to the usec delay
159217ea1177Swdenk		required. (minimum 300usec for LXT971A)
159317ea1177Swdenk
159417ea1177Swdenk		CONFIG_PHY_CMD_DELAY (ppc4xx)
159517ea1177Swdenk
159617ea1177Swdenk		Some PHY like Intel LXT971A need extra delay after
159717ea1177Swdenk		command issued before MII status register can be read
159817ea1177Swdenk
1599c609719bSwdenk- Ethernet address:
1600c609719bSwdenk		CONFIG_ETHADDR
1601c68a05feSrichardretanubun		CONFIG_ETH1ADDR
1602c609719bSwdenk		CONFIG_ETH2ADDR
1603c609719bSwdenk		CONFIG_ETH3ADDR
1604c68a05feSrichardretanubun		CONFIG_ETH4ADDR
1605c68a05feSrichardretanubun		CONFIG_ETH5ADDR
1606c609719bSwdenk
160711ccc33fSMarcel Ziswiler		Define a default value for Ethernet address to use
160811ccc33fSMarcel Ziswiler		for the respective Ethernet interface, in case this
1609c609719bSwdenk		is not determined automatically.
1610c609719bSwdenk
1611c609719bSwdenk- IP address:
1612c609719bSwdenk		CONFIG_IPADDR
1613c609719bSwdenk
1614c609719bSwdenk		Define a default value for the IP address to use for
161511ccc33fSMarcel Ziswiler		the default Ethernet interface, in case this is not
1616c609719bSwdenk		determined through e.g. bootp.
16171ebcd654SWolfgang Denk		(Environment variable "ipaddr")
1618c609719bSwdenk
1619c609719bSwdenk- Server IP address:
1620c609719bSwdenk		CONFIG_SERVERIP
1621c609719bSwdenk
1622c609719bSwdenk		Defines a default value for the IP address of a TFTP
1623c609719bSwdenk		server to contact when using the "tftboot" command.
16241ebcd654SWolfgang Denk		(Environment variable "serverip")
1625c609719bSwdenk
162697cfe861SRobin Getz		CONFIG_KEEP_SERVERADDR
162797cfe861SRobin Getz
162897cfe861SRobin Getz		Keeps the server's MAC address, in the env 'serveraddr'
162997cfe861SRobin Getz		for passing to bootargs (like Linux's netconsole option)
163097cfe861SRobin Getz
16311ebcd654SWolfgang Denk- Gateway IP address:
16321ebcd654SWolfgang Denk		CONFIG_GATEWAYIP
16331ebcd654SWolfgang Denk
16341ebcd654SWolfgang Denk		Defines a default value for the IP address of the
16351ebcd654SWolfgang Denk		default router where packets to other networks are
16361ebcd654SWolfgang Denk		sent to.
16371ebcd654SWolfgang Denk		(Environment variable "gatewayip")
16381ebcd654SWolfgang Denk
16391ebcd654SWolfgang Denk- Subnet mask:
16401ebcd654SWolfgang Denk		CONFIG_NETMASK
16411ebcd654SWolfgang Denk
16421ebcd654SWolfgang Denk		Defines a default value for the subnet mask (or
16431ebcd654SWolfgang Denk		routing prefix) which is used to determine if an IP
16441ebcd654SWolfgang Denk		address belongs to the local subnet or needs to be
16451ebcd654SWolfgang Denk		forwarded through a router.
16461ebcd654SWolfgang Denk		(Environment variable "netmask")
16471ebcd654SWolfgang Denk
164853a5c424SDavid Updegraff- Multicast TFTP Mode:
164953a5c424SDavid Updegraff		CONFIG_MCAST_TFTP
165053a5c424SDavid Updegraff
165153a5c424SDavid Updegraff		Defines whether you want to support multicast TFTP as per
165253a5c424SDavid Updegraff		rfc-2090; for example to work with atftp.  Lets lots of targets
165311ccc33fSMarcel Ziswiler		tftp down the same boot image concurrently.  Note: the Ethernet
165453a5c424SDavid Updegraff		driver in use must provide a function: mcast() to join/leave a
165553a5c424SDavid Updegraff		multicast group.
165653a5c424SDavid Updegraff
1657c609719bSwdenk- BOOTP Recovery Mode:
1658c609719bSwdenk		CONFIG_BOOTP_RANDOM_DELAY
1659c609719bSwdenk
1660c609719bSwdenk		If you have many targets in a network that try to
1661c609719bSwdenk		boot using BOOTP, you may want to avoid that all
1662c609719bSwdenk		systems send out BOOTP requests at precisely the same
1663c609719bSwdenk		moment (which would happen for instance at recovery
1664c609719bSwdenk		from a power failure, when all systems will try to
1665c609719bSwdenk		boot, thus flooding the BOOTP server. Defining
1666c609719bSwdenk		CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be
1667c609719bSwdenk		inserted before sending out BOOTP requests. The
16686c33c785SWolfgang Denk		following delays are inserted then:
1669c609719bSwdenk
1670c609719bSwdenk		1st BOOTP request:	delay 0 ... 1 sec
1671c609719bSwdenk		2nd BOOTP request:	delay 0 ... 2 sec
1672c609719bSwdenk		3rd BOOTP request:	delay 0 ... 4 sec
1673c609719bSwdenk		4th and following
1674c609719bSwdenk		BOOTP requests:		delay 0 ... 8 sec
1675c609719bSwdenk
1676fe389a82Sstroese- DHCP Advanced Options:
16771fe80d79SJon Loeliger		You can fine tune the DHCP functionality by defining
16781fe80d79SJon Loeliger		CONFIG_BOOTP_* symbols:
1679fe389a82Sstroese
16801fe80d79SJon Loeliger		CONFIG_BOOTP_SUBNETMASK
16811fe80d79SJon Loeliger		CONFIG_BOOTP_GATEWAY
16821fe80d79SJon Loeliger		CONFIG_BOOTP_HOSTNAME
16831fe80d79SJon Loeliger		CONFIG_BOOTP_NISDOMAIN
16841fe80d79SJon Loeliger		CONFIG_BOOTP_BOOTPATH
16851fe80d79SJon Loeliger		CONFIG_BOOTP_BOOTFILESIZE
16861fe80d79SJon Loeliger		CONFIG_BOOTP_DNS
16871fe80d79SJon Loeliger		CONFIG_BOOTP_DNS2
16881fe80d79SJon Loeliger		CONFIG_BOOTP_SEND_HOSTNAME
16891fe80d79SJon Loeliger		CONFIG_BOOTP_NTPSERVER
16901fe80d79SJon Loeliger		CONFIG_BOOTP_TIMEOFFSET
16911fe80d79SJon Loeliger		CONFIG_BOOTP_VENDOREX
16922c00e099SJoe Hershberger		CONFIG_BOOTP_MAY_FAIL
1693fe389a82Sstroese
16945d110f0aSWilson Callan		CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip
16955d110f0aSWilson Callan		environment variable, not the BOOTP server.
1696fe389a82Sstroese
16972c00e099SJoe Hershberger		CONFIG_BOOTP_MAY_FAIL - If the DHCP server is not found
16982c00e099SJoe Hershberger		after the configured retry count, the call will fail
16992c00e099SJoe Hershberger		instead of starting over.  This can be used to fail over
17002c00e099SJoe Hershberger		to Link-local IP address configuration if the DHCP server
17012c00e099SJoe Hershberger		is not available.
17022c00e099SJoe Hershberger
1703fe389a82Sstroese		CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS
1704fe389a82Sstroese		serverip from a DHCP server, it is possible that more
1705fe389a82Sstroese		than one DNS serverip is offered to the client.
1706fe389a82Sstroese		If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS
1707fe389a82Sstroese		serverip will be stored in the additional environment
1708fe389a82Sstroese		variable "dnsip2". The first DNS serverip is always
1709fe389a82Sstroese		stored in the variable "dnsip", when CONFIG_BOOTP_DNS
17101fe80d79SJon Loeliger		is defined.
1711fe389a82Sstroese
1712fe389a82Sstroese		CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable
1713fe389a82Sstroese		to do a dynamic update of a DNS server. To do this, they
1714fe389a82Sstroese		need the hostname of the DHCP requester.
17155d110f0aSWilson Callan		If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content
17161fe80d79SJon Loeliger		of the "hostname" environment variable is passed as
17171fe80d79SJon Loeliger		option 12 to the DHCP server.
1718fe389a82Sstroese
1719d9a2f416SAras Vaichas		CONFIG_BOOTP_DHCP_REQUEST_DELAY
1720d9a2f416SAras Vaichas
1721d9a2f416SAras Vaichas		A 32bit value in microseconds for a delay between
1722d9a2f416SAras Vaichas		receiving a "DHCP Offer" and sending the "DHCP Request".
1723d9a2f416SAras Vaichas		This fixes a problem with certain DHCP servers that don't
1724d9a2f416SAras Vaichas		respond 100% of the time to a "DHCP request". E.g. On an
1725d9a2f416SAras Vaichas		AT91RM9200 processor running at 180MHz, this delay needed
1726d9a2f416SAras Vaichas		to be *at least* 15,000 usec before a Windows Server 2003
1727d9a2f416SAras Vaichas		DHCP server would reply 100% of the time. I recommend at
1728d9a2f416SAras Vaichas		least 50,000 usec to be safe. The alternative is to hope
1729d9a2f416SAras Vaichas		that one of the retries will be successful but note that
1730d9a2f416SAras Vaichas		the DHCP timeout and retry process takes a longer than
1731d9a2f416SAras Vaichas		this delay.
1732d9a2f416SAras Vaichas
1733d22c338eSJoe Hershberger - Link-local IP address negotiation:
1734d22c338eSJoe Hershberger		Negotiate with other link-local clients on the local network
1735d22c338eSJoe Hershberger		for an address that doesn't require explicit configuration.
1736d22c338eSJoe Hershberger		This is especially useful if a DHCP server cannot be guaranteed
1737d22c338eSJoe Hershberger		to exist in all environments that the device must operate.
1738d22c338eSJoe Hershberger
1739d22c338eSJoe Hershberger		See doc/README.link-local for more information.
1740d22c338eSJoe Hershberger
1741a3d991bdSwdenk - CDP Options:
1742a3d991bdSwdenk		CONFIG_CDP_DEVICE_ID
1743a3d991bdSwdenk
1744a3d991bdSwdenk		The device id used in CDP trigger frames.
1745a3d991bdSwdenk
1746a3d991bdSwdenk		CONFIG_CDP_DEVICE_ID_PREFIX
1747a3d991bdSwdenk
1748a3d991bdSwdenk		A two character string which is prefixed to the MAC address
1749a3d991bdSwdenk		of the device.
1750a3d991bdSwdenk
1751a3d991bdSwdenk		CONFIG_CDP_PORT_ID
1752a3d991bdSwdenk
1753a3d991bdSwdenk		A printf format string which contains the ascii name of
1754a3d991bdSwdenk		the port. Normally is set to "eth%d" which sets
175511ccc33fSMarcel Ziswiler		eth0 for the first Ethernet, eth1 for the second etc.
1756a3d991bdSwdenk
1757a3d991bdSwdenk		CONFIG_CDP_CAPABILITIES
1758a3d991bdSwdenk
1759a3d991bdSwdenk		A 32bit integer which indicates the device capabilities;
1760a3d991bdSwdenk		0x00000010 for a normal host which does not forwards.
1761a3d991bdSwdenk
1762a3d991bdSwdenk		CONFIG_CDP_VERSION
1763a3d991bdSwdenk
1764a3d991bdSwdenk		An ascii string containing the version of the software.
1765a3d991bdSwdenk
1766a3d991bdSwdenk		CONFIG_CDP_PLATFORM
1767a3d991bdSwdenk
1768a3d991bdSwdenk		An ascii string containing the name of the platform.
1769a3d991bdSwdenk
1770a3d991bdSwdenk		CONFIG_CDP_TRIGGER
1771a3d991bdSwdenk
1772a3d991bdSwdenk		A 32bit integer sent on the trigger.
1773a3d991bdSwdenk
1774a3d991bdSwdenk		CONFIG_CDP_POWER_CONSUMPTION
1775a3d991bdSwdenk
1776a3d991bdSwdenk		A 16bit integer containing the power consumption of the
1777a3d991bdSwdenk		device in .1 of milliwatts.
1778a3d991bdSwdenk
1779a3d991bdSwdenk		CONFIG_CDP_APPLIANCE_VLAN_TYPE
1780a3d991bdSwdenk
1781a3d991bdSwdenk		A byte containing the id of the VLAN.
1782a3d991bdSwdenk
1783c609719bSwdenk- Status LED:	CONFIG_STATUS_LED
1784c609719bSwdenk
1785c609719bSwdenk		Several configurations allow to display the current
1786c609719bSwdenk		status using a LED. For instance, the LED will blink
1787c609719bSwdenk		fast while running U-Boot code, stop blinking as
1788c609719bSwdenk		soon as a reply to a BOOTP request was received, and
1789c609719bSwdenk		start blinking slow once the Linux kernel is running
1790c609719bSwdenk		(supported by a status LED driver in the Linux
1791c609719bSwdenk		kernel). Defining CONFIG_STATUS_LED enables this
1792c609719bSwdenk		feature in U-Boot.
1793c609719bSwdenk
1794c609719bSwdenk- CAN Support:	CONFIG_CAN_DRIVER
1795c609719bSwdenk
1796c609719bSwdenk		Defining CONFIG_CAN_DRIVER enables CAN driver support
1797c609719bSwdenk		on those systems that support this (optional)
1798c609719bSwdenk		feature, like the TQM8xxL modules.
1799c609719bSwdenk
1800c609719bSwdenk- I2C Support:	CONFIG_HARD_I2C | CONFIG_SOFT_I2C
1801c609719bSwdenk
1802b37c7e5eSwdenk		These enable I2C serial bus commands. Defining either of
1803b37c7e5eSwdenk		(but not both of) CONFIG_HARD_I2C or CONFIG_SOFT_I2C will
180411ccc33fSMarcel Ziswiler		include the appropriate I2C driver for the selected CPU.
1805c609719bSwdenk
1806b37c7e5eSwdenk		This will allow you to use i2c commands at the u-boot
1807602ad3b3SJon Loeliger		command line (as long as you set CONFIG_CMD_I2C in
1808b37c7e5eSwdenk		CONFIG_COMMANDS) and communicate with i2c based realtime
1809b37c7e5eSwdenk		clock chips. See common/cmd_i2c.c for a description of the
1810c609719bSwdenk		command line interface.
1811c609719bSwdenk
1812bb99ad6dSBen Warren		CONFIG_HARD_I2C selects a hardware I2C controller.
1813c609719bSwdenk
1814b37c7e5eSwdenk		CONFIG_SOFT_I2C configures u-boot to use a software (aka
1815b37c7e5eSwdenk		bit-banging) driver instead of CPM or similar hardware
1816b37c7e5eSwdenk		support for I2C.
1817c609719bSwdenk
1818b37c7e5eSwdenk		There are several other quantities that must also be
1819b37c7e5eSwdenk		defined when you define CONFIG_HARD_I2C or CONFIG_SOFT_I2C.
1820c609719bSwdenk
18216d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		In both cases you will need to define CONFIG_SYS_I2C_SPEED
1822b37c7e5eSwdenk		to be the frequency (in Hz) at which you wish your i2c bus
18236d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		to run and CONFIG_SYS_I2C_SLAVE to be the address of this node (ie
182411ccc33fSMarcel Ziswiler		the CPU's i2c node address).
1825c609719bSwdenk
18268d321b81SPeter Tyser		Now, the u-boot i2c code for the mpc8xx
1827a47a12beSStefan Roese		(arch/powerpc/cpu/mpc8xx/i2c.c) sets the CPU up as a master node
18288d321b81SPeter Tyser		and so its address should therefore be cleared to 0 (See,
18298d321b81SPeter Tyser		eg, MPC823e User's Manual p.16-473). So, set
18308d321b81SPeter Tyser		CONFIG_SYS_I2C_SLAVE to 0.
1831b37c7e5eSwdenk
18325da71efaSEric Millbrandt		CONFIG_SYS_I2C_INIT_MPC5XXX
18335da71efaSEric Millbrandt
18345da71efaSEric Millbrandt		When a board is reset during an i2c bus transfer
18355da71efaSEric Millbrandt		chips might think that the current transfer is still
18365da71efaSEric Millbrandt		in progress.  Reset the slave devices by sending start
18375da71efaSEric Millbrandt		commands until the slave device responds.
18385da71efaSEric Millbrandt
1839b37c7e5eSwdenk		That's all that's required for CONFIG_HARD_I2C.
1840b37c7e5eSwdenk
1841b37c7e5eSwdenk		If you use the software i2c interface (CONFIG_SOFT_I2C)
1842b37c7e5eSwdenk		then the following macros need to be defined (examples are
1843b37c7e5eSwdenk		from include/configs/lwmon.h):
1844c609719bSwdenk
1845c609719bSwdenk		I2C_INIT
1846c609719bSwdenk
1847b37c7e5eSwdenk		(Optional). Any commands necessary to enable the I2C
1848c609719bSwdenk		controller or configure ports.
1849c609719bSwdenk
1850b37c7e5eSwdenk		eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |=	PB_SCL)
1851b37c7e5eSwdenk
1852c609719bSwdenk		I2C_PORT
1853c609719bSwdenk
1854c609719bSwdenk		(Only for MPC8260 CPU). The I/O port to use (the code
1855c609719bSwdenk		assumes both bits are on the same port). Valid values
1856c609719bSwdenk		are 0..3 for ports A..D.
1857c609719bSwdenk
1858c609719bSwdenk		I2C_ACTIVE
1859c609719bSwdenk
1860c609719bSwdenk		The code necessary to make the I2C data line active
1861c609719bSwdenk		(driven).  If the data line is open collector, this
1862c609719bSwdenk		define can be null.
1863c609719bSwdenk
1864b37c7e5eSwdenk		eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |=  PB_SDA)
1865b37c7e5eSwdenk
1866c609719bSwdenk		I2C_TRISTATE
1867c609719bSwdenk
1868c609719bSwdenk		The code necessary to make the I2C data line tri-stated
1869c609719bSwdenk		(inactive).  If the data line is open collector, this
1870c609719bSwdenk		define can be null.
1871c609719bSwdenk
1872b37c7e5eSwdenk		eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA)
1873b37c7e5eSwdenk
1874c609719bSwdenk		I2C_READ
1875c609719bSwdenk
1876c609719bSwdenk		Code that returns TRUE if the I2C data line is high,
1877c609719bSwdenk		FALSE if it is low.
1878c609719bSwdenk
1879b37c7e5eSwdenk		eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0)
1880b37c7e5eSwdenk
1881c609719bSwdenk		I2C_SDA(bit)
1882c609719bSwdenk
1883c609719bSwdenk		If <bit> is TRUE, sets the I2C data line high. If it
1884c609719bSwdenk		is FALSE, it clears it (low).
1885c609719bSwdenk
1886b37c7e5eSwdenk		eg: #define I2C_SDA(bit) \
1887b37c7e5eSwdenk			if(bit) immr->im_cpm.cp_pbdat |=  PB_SDA; \
1888b37c7e5eSwdenk			else	immr->im_cpm.cp_pbdat &= ~PB_SDA
1889b37c7e5eSwdenk
1890c609719bSwdenk		I2C_SCL(bit)
1891c609719bSwdenk
1892c609719bSwdenk		If <bit> is TRUE, sets the I2C clock line high. If it
1893c609719bSwdenk		is FALSE, it clears it (low).
1894c609719bSwdenk
1895b37c7e5eSwdenk		eg: #define I2C_SCL(bit) \
1896b37c7e5eSwdenk			if(bit) immr->im_cpm.cp_pbdat |=  PB_SCL; \
1897b37c7e5eSwdenk			else	immr->im_cpm.cp_pbdat &= ~PB_SCL
1898b37c7e5eSwdenk
1899c609719bSwdenk		I2C_DELAY
1900c609719bSwdenk
1901c609719bSwdenk		This delay is invoked four times per clock cycle so this
1902c609719bSwdenk		controls the rate of data transfer.  The data rate thus
1903b37c7e5eSwdenk		is 1 / (I2C_DELAY * 4). Often defined to be something
1904b37c7e5eSwdenk		like:
1905b37c7e5eSwdenk
1906b37c7e5eSwdenk		#define I2C_DELAY  udelay(2)
1907c609719bSwdenk
1908793b5726SMike Frysinger		CONFIG_SOFT_I2C_GPIO_SCL / CONFIG_SOFT_I2C_GPIO_SDA
1909793b5726SMike Frysinger
1910793b5726SMike Frysinger		If your arch supports the generic GPIO framework (asm/gpio.h),
1911793b5726SMike Frysinger		then you may alternatively define the two GPIOs that are to be
1912793b5726SMike Frysinger		used as SCL / SDA.  Any of the previous I2C_xxx macros will
1913793b5726SMike Frysinger		have GPIO-based defaults assigned to them as appropriate.
1914793b5726SMike Frysinger
1915793b5726SMike Frysinger		You should define these to the GPIO value as given directly to
1916793b5726SMike Frysinger		the generic GPIO functions.
1917793b5726SMike Frysinger
19186d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_INIT_BOARD
191947cd00faSwdenk
192047cd00faSwdenk		When a board is reset during an i2c bus transfer
192147cd00faSwdenk		chips might think that the current transfer is still
192247cd00faSwdenk		in progress. On some boards it is possible to access
192347cd00faSwdenk		the i2c SCLK line directly, either by using the
192447cd00faSwdenk		processor pin as a GPIO or by having a second pin
192547cd00faSwdenk		connected to the bus. If this option is defined a
192647cd00faSwdenk		custom i2c_init_board() routine in boards/xxx/board.c
192747cd00faSwdenk		is run early in the boot sequence.
192847cd00faSwdenk
192926a33504SRichard Retanubun		CONFIG_SYS_I2C_BOARD_LATE_INIT
193026a33504SRichard Retanubun
193126a33504SRichard Retanubun		An alternative to CONFIG_SYS_I2C_INIT_BOARD. If this option is
193226a33504SRichard Retanubun		defined a custom i2c_board_late_init() routine in
193326a33504SRichard Retanubun		boards/xxx/board.c is run AFTER the operations in i2c_init()
193426a33504SRichard Retanubun		is completed. This callpoint can be used to unreset i2c bus
193526a33504SRichard Retanubun		using CPU i2c controller register accesses for CPUs whose i2c
193626a33504SRichard Retanubun		controller provide such a method. It is called at the end of
193726a33504SRichard Retanubun		i2c_init() to allow i2c_init operations to setup the i2c bus
193826a33504SRichard Retanubun		controller on the CPU (e.g. setting bus speed & slave address).
193926a33504SRichard Retanubun
194017ea1177Swdenk		CONFIG_I2CFAST (PPC405GP|PPC405EP only)
194117ea1177Swdenk
194217ea1177Swdenk		This option enables configuration of bi_iic_fast[] flags
194317ea1177Swdenk		in u-boot bd_info structure based on u-boot environment
194417ea1177Swdenk		variable "i2cfast". (see also i2cfast)
194517ea1177Swdenk
1946bb99ad6dSBen Warren		CONFIG_I2C_MULTI_BUS
1947bb99ad6dSBen Warren
1948bb99ad6dSBen Warren		This option allows the use of multiple I2C buses, each of which
1949bb99ad6dSBen Warren		must have a controller.	 At any point in time, only one bus is
1950bb99ad6dSBen Warren		active.	 To switch to a different bus, use the 'i2c dev' command.
1951bb99ad6dSBen Warren		Note that bus numbering is zero-based.
1952bb99ad6dSBen Warren
19536d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_NOPROBES
1954bb99ad6dSBen Warren
1955bb99ad6dSBen Warren		This option specifies a list of I2C devices that will be skipped
19560f89c54bSPeter Tyser		when the 'i2c probe' command is issued.	 If CONFIG_I2C_MULTI_BUS
19570f89c54bSPeter Tyser		is set, specify a list of bus-device pairs.  Otherwise, specify
19580f89c54bSPeter Tyser		a 1D array of device addresses
1959bb99ad6dSBen Warren
1960bb99ad6dSBen Warren		e.g.
1961bb99ad6dSBen Warren			#undef	CONFIG_I2C_MULTI_BUS
19626d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			#define CONFIG_SYS_I2C_NOPROBES {0x50,0x68}
1963bb99ad6dSBen Warren
1964bb99ad6dSBen Warren		will skip addresses 0x50 and 0x68 on a board with one I2C bus
1965bb99ad6dSBen Warren
1966bb99ad6dSBen Warren			#define CONFIG_I2C_MULTI_BUS
19676d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			#define CONFIG_SYS_I2C_MULTI_NOPROBES	{{0,0x50},{0,0x68},{1,0x54}}
1968bb99ad6dSBen Warren
1969bb99ad6dSBen Warren		will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1
1970bb99ad6dSBen Warren
19716d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SPD_BUS_NUM
1972be5e6181STimur Tabi
1973be5e6181STimur Tabi		If defined, then this indicates the I2C bus number for DDR SPD.
1974be5e6181STimur Tabi		If not defined, then U-Boot assumes that SPD is on I2C bus 0.
1975be5e6181STimur Tabi
19766d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_RTC_BUS_NUM
19770dc018ecSStefan Roese
19780dc018ecSStefan Roese		If defined, then this indicates the I2C bus number for the RTC.
19790dc018ecSStefan Roese		If not defined, then U-Boot assumes that RTC is on I2C bus 0.
19800dc018ecSStefan Roese
19816d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_DTT_BUS_NUM
19820dc018ecSStefan Roese
19830dc018ecSStefan Roese		If defined, then this indicates the I2C bus number for the DTT.
19840dc018ecSStefan Roese		If not defined, then U-Boot assumes that DTT is on I2C bus 0.
19850dc018ecSStefan Roese
19866d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_DTT_ADDR:
19879ebbb54fSVictor Gallardo
19889ebbb54fSVictor Gallardo		If defined, specifies the I2C address of the DTT device.
19899ebbb54fSVictor Gallardo		If not defined, then U-Boot uses predefined value for
19909ebbb54fSVictor Gallardo		specified DTT device.
19919ebbb54fSVictor Gallardo
1992be5e6181STimur Tabi		CONFIG_FSL_I2C
1993be5e6181STimur Tabi
1994be5e6181STimur Tabi		Define this option if you want to use Freescale's I2C driver in
19957817cb20SMarcel Ziswiler		drivers/i2c/fsl_i2c.c.
1996be5e6181STimur Tabi
199767b23a32SHeiko Schocher		CONFIG_I2C_MUX
199867b23a32SHeiko Schocher
199967b23a32SHeiko Schocher		Define this option if you have I2C devices reached over 1 .. n
200067b23a32SHeiko Schocher		I2C Muxes like the pca9544a. This option addes a new I2C
200167b23a32SHeiko Schocher		Command "i2c bus [muxtype:muxaddr:muxchannel]" which adds a
200267b23a32SHeiko Schocher		new I2C Bus to the existing I2C Busses. If you select the
200367b23a32SHeiko Schocher		new Bus with "i2c dev", u-bbot sends first the commandos for
200467b23a32SHeiko Schocher		the muxes to activate this new "bus".
200567b23a32SHeiko Schocher
200667b23a32SHeiko Schocher		CONFIG_I2C_MULTI_BUS must be also defined, to use this
200767b23a32SHeiko Schocher		feature!
200867b23a32SHeiko Schocher
200967b23a32SHeiko Schocher		Example:
201067b23a32SHeiko Schocher		Adding a new I2C Bus reached over 2 pca9544a muxes
201167b23a32SHeiko Schocher			The First mux with address 70 and channel 6
201267b23a32SHeiko Schocher			The Second mux with address 71 and channel 4
201367b23a32SHeiko Schocher
201467b23a32SHeiko Schocher		=> i2c bus pca9544a:70:6:pca9544a:71:4
201567b23a32SHeiko Schocher
201667b23a32SHeiko Schocher		Use the "i2c bus" command without parameter, to get a list
201767b23a32SHeiko Schocher		of I2C Busses with muxes:
201867b23a32SHeiko Schocher
201967b23a32SHeiko Schocher		=> i2c bus
202067b23a32SHeiko Schocher		Busses reached over muxes:
202167b23a32SHeiko Schocher		Bus ID: 2
202267b23a32SHeiko Schocher		  reached over Mux(es):
202367b23a32SHeiko Schocher		    pca9544a@70 ch: 4
202467b23a32SHeiko Schocher		Bus ID: 3
202567b23a32SHeiko Schocher		  reached over Mux(es):
202667b23a32SHeiko Schocher		    pca9544a@70 ch: 6
202767b23a32SHeiko Schocher		    pca9544a@71 ch: 4
202867b23a32SHeiko Schocher		=>
202967b23a32SHeiko Schocher
203067b23a32SHeiko Schocher		If you now switch to the new I2C Bus 3 with "i2c dev 3"
2031f9a78b8dSMichael Jones		u-boot first sends the command to the mux@70 to enable
2032f9a78b8dSMichael Jones		channel 6, and then the command to the mux@71 to enable
203367b23a32SHeiko Schocher		the channel 4.
203467b23a32SHeiko Schocher
203567b23a32SHeiko Schocher		After that, you can use the "normal" i2c commands as
2036f9a78b8dSMichael Jones		usual to communicate with your I2C devices behind
203767b23a32SHeiko Schocher		the 2 muxes.
203867b23a32SHeiko Schocher
203967b23a32SHeiko Schocher		This option is actually implemented for the bitbanging
204067b23a32SHeiko Schocher		algorithm in common/soft_i2c.c and for the Hardware I2C
204167b23a32SHeiko Schocher		Bus on the MPC8260. But it should be not so difficult
204267b23a32SHeiko Schocher		to add this option to other architectures.
204367b23a32SHeiko Schocher
20442ac6985aSAndrew Dyer		CONFIG_SOFT_I2C_READ_REPEATED_START
20452ac6985aSAndrew Dyer
20462ac6985aSAndrew Dyer		defining this will force the i2c_read() function in
20472ac6985aSAndrew Dyer		the soft_i2c driver to perform an I2C repeated start
20482ac6985aSAndrew Dyer		between writing the address pointer and reading the
20492ac6985aSAndrew Dyer		data.  If this define is omitted the default behaviour
20502ac6985aSAndrew Dyer		of doing a stop-start sequence will be used.  Most I2C
20512ac6985aSAndrew Dyer		devices can use either method, but some require one or
20522ac6985aSAndrew Dyer		the other.
2053be5e6181STimur Tabi
2054c609719bSwdenk- SPI Support:	CONFIG_SPI
2055c609719bSwdenk
2056c609719bSwdenk		Enables SPI driver (so far only tested with
2057c609719bSwdenk		SPI EEPROM, also an instance works with Crystal A/D and
2058c609719bSwdenk		D/As on the SACSng board)
2059c609719bSwdenk
20606639562eSYoshihiro Shimoda		CONFIG_SH_SPI
20616639562eSYoshihiro Shimoda
20626639562eSYoshihiro Shimoda		Enables the driver for SPI controller on SuperH. Currently
20636639562eSYoshihiro Shimoda		only SH7757 is supported.
20646639562eSYoshihiro Shimoda
2065c609719bSwdenk		CONFIG_SPI_X
2066c609719bSwdenk
2067c609719bSwdenk		Enables extended (16-bit) SPI EEPROM addressing.
2068c609719bSwdenk		(symmetrical to CONFIG_I2C_X)
2069c609719bSwdenk
2070c609719bSwdenk		CONFIG_SOFT_SPI
2071c609719bSwdenk
2072c609719bSwdenk		Enables a software (bit-bang) SPI driver rather than
2073c609719bSwdenk		using hardware support. This is a general purpose
2074c609719bSwdenk		driver that only requires three general I/O port pins
2075c609719bSwdenk		(two outputs, one input) to function. If this is
2076c609719bSwdenk		defined, the board configuration must define several
2077c609719bSwdenk		SPI configuration items (port pins to use, etc). For
2078c609719bSwdenk		an example, see include/configs/sacsng.h.
2079c609719bSwdenk
208004a9e118SBen Warren		CONFIG_HARD_SPI
208104a9e118SBen Warren
208204a9e118SBen Warren		Enables a hardware SPI driver for general-purpose reads
208304a9e118SBen Warren		and writes.  As with CONFIG_SOFT_SPI, the board configuration
208404a9e118SBen Warren		must define a list of chip-select function pointers.
208504a9e118SBen Warren		Currently supported on some MPC8xxx processors.	 For an
208604a9e118SBen Warren		example, see include/configs/mpc8349emds.h.
208704a9e118SBen Warren
208838254f45SGuennadi Liakhovetski		CONFIG_MXC_SPI
208938254f45SGuennadi Liakhovetski
209038254f45SGuennadi Liakhovetski		Enables the driver for the SPI controllers on i.MX and MXC
20912e3cd1cdSFabio Estevam		SoCs. Currently i.MX31/35/51 are supported.
209238254f45SGuennadi Liakhovetski
20930133502eSMatthias Fuchs- FPGA Support: CONFIG_FPGA
20940133502eSMatthias Fuchs
20950133502eSMatthias Fuchs		Enables FPGA subsystem.
20960133502eSMatthias Fuchs
20970133502eSMatthias Fuchs		CONFIG_FPGA_<vendor>
20980133502eSMatthias Fuchs
20990133502eSMatthias Fuchs		Enables support for specific chip vendors.
21000133502eSMatthias Fuchs		(ALTERA, XILINX)
21010133502eSMatthias Fuchs
21020133502eSMatthias Fuchs		CONFIG_FPGA_<family>
21030133502eSMatthias Fuchs
21040133502eSMatthias Fuchs		Enables support for FPGA family.
21050133502eSMatthias Fuchs		(SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX)
21060133502eSMatthias Fuchs
21070133502eSMatthias Fuchs		CONFIG_FPGA_COUNT
2108c609719bSwdenk
2109c609719bSwdenk		Specify the number of FPGA devices to support.
2110c609719bSwdenk
21116d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_PROG_FEEDBACK
2112c609719bSwdenk
2113c609719bSwdenk		Enable printing of hash marks during FPGA configuration.
2114c609719bSwdenk
21156d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_BUSY
2116c609719bSwdenk
2117c609719bSwdenk		Enable checks on FPGA configuration interface busy
2118c609719bSwdenk		status by the configuration function. This option
2119c609719bSwdenk		will require a board or device specific function to
2120c609719bSwdenk		be written.
2121c609719bSwdenk
2122c609719bSwdenk		CONFIG_FPGA_DELAY
2123c609719bSwdenk
2124c609719bSwdenk		If defined, a function that provides delays in the FPGA
2125c609719bSwdenk		configuration driver.
2126c609719bSwdenk
21276d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_CTRLC
2128c609719bSwdenk		Allow Control-C to interrupt FPGA configuration
2129c609719bSwdenk
21306d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_ERROR
2131c609719bSwdenk
2132c609719bSwdenk		Check for configuration errors during FPGA bitfile
2133c609719bSwdenk		loading. For example, abort during Virtex II
2134c609719bSwdenk		configuration if the INIT_B line goes low (which
2135c609719bSwdenk		indicated a CRC error).
2136c609719bSwdenk
21376d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_INIT
2138c609719bSwdenk
2139c609719bSwdenk		Maximum time to wait for the INIT_B line to deassert
2140c609719bSwdenk		after PROB_B has been deasserted during a Virtex II
2141c609719bSwdenk		FPGA configuration sequence. The default time is 500
214211ccc33fSMarcel Ziswiler		ms.
2143c609719bSwdenk
21446d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_BUSY
2145c609719bSwdenk
2146c609719bSwdenk		Maximum time to wait for BUSY to deassert during
214711ccc33fSMarcel Ziswiler		Virtex II FPGA configuration. The default is 5 ms.
2148c609719bSwdenk
21496d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_CONFIG
2150c609719bSwdenk
2151c609719bSwdenk		Time to wait after FPGA configuration. The default is
215211ccc33fSMarcel Ziswiler		200 ms.
2153c609719bSwdenk
2154c609719bSwdenk- Configuration Management:
2155c609719bSwdenk		CONFIG_IDENT_STRING
2156c609719bSwdenk
2157c609719bSwdenk		If defined, this string will be added to the U-Boot
2158c609719bSwdenk		version information (U_BOOT_VERSION)
2159c609719bSwdenk
2160c609719bSwdenk- Vendor Parameter Protection:
2161c609719bSwdenk
2162c609719bSwdenk		U-Boot considers the values of the environment
2163c609719bSwdenk		variables "serial#" (Board Serial Number) and
21647152b1d0Swdenk		"ethaddr" (Ethernet Address) to be parameters that
2165c609719bSwdenk		are set once by the board vendor / manufacturer, and
2166c609719bSwdenk		protects these variables from casual modification by
2167c609719bSwdenk		the user. Once set, these variables are read-only,
2168c609719bSwdenk		and write or delete attempts are rejected. You can
216911ccc33fSMarcel Ziswiler		change this behaviour:
2170c609719bSwdenk
2171c609719bSwdenk		If CONFIG_ENV_OVERWRITE is #defined in your config
2172c609719bSwdenk		file, the write protection for vendor parameters is
217347cd00faSwdenk		completely disabled. Anybody can change or delete
2174c609719bSwdenk		these parameters.
2175c609719bSwdenk
2176c609719bSwdenk		Alternatively, if you #define _both_ CONFIG_ETHADDR
2177c609719bSwdenk		_and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default
217811ccc33fSMarcel Ziswiler		Ethernet address is installed in the environment,
2179c609719bSwdenk		which can be changed exactly ONCE by the user. [The
2180c609719bSwdenk		serial# is unaffected by this, i. e. it remains
2181c609719bSwdenk		read-only.]
2182c609719bSwdenk
2183c609719bSwdenk- Protected RAM:
2184c609719bSwdenk		CONFIG_PRAM
2185c609719bSwdenk
2186c609719bSwdenk		Define this variable to enable the reservation of
2187c609719bSwdenk		"protected RAM", i. e. RAM which is not overwritten
2188c609719bSwdenk		by U-Boot. Define CONFIG_PRAM to hold the number of
2189c609719bSwdenk		kB you want to reserve for pRAM. You can overwrite
2190c609719bSwdenk		this default value by defining an environment
2191c609719bSwdenk		variable "pram" to the number of kB you want to
2192c609719bSwdenk		reserve. Note that the board info structure will
2193c609719bSwdenk		still show the full amount of RAM. If pRAM is
2194c609719bSwdenk		reserved, a new environment variable "mem" will
2195c609719bSwdenk		automatically be defined to hold the amount of
2196c609719bSwdenk		remaining RAM in a form that can be passed as boot
2197c609719bSwdenk		argument to Linux, for instance like that:
2198c609719bSwdenk
2199fe126d8bSWolfgang Denk			setenv bootargs ... mem=\${mem}
2200c609719bSwdenk			saveenv
2201c609719bSwdenk
2202c609719bSwdenk		This way you can tell Linux not to use this memory,
2203c609719bSwdenk		either, which results in a memory region that will
2204c609719bSwdenk		not be affected by reboots.
2205c609719bSwdenk
2206c609719bSwdenk		*WARNING* If your board configuration uses automatic
2207c609719bSwdenk		detection of the RAM size, you must make sure that
2208c609719bSwdenk		this memory test is non-destructive. So far, the
2209c609719bSwdenk		following board configurations are known to be
2210c609719bSwdenk		"pRAM-clean":
2211c609719bSwdenk
22121b0757ecSWolfgang Denk			IVMS8, IVML24, SPD8xx, TQM8xxL,
22131b0757ecSWolfgang Denk			HERMES, IP860, RPXlite, LWMON,
2214544d97e9SWolfgang Denk			FLAGADM, TQM8260
2215c609719bSwdenk
221640fef049SGabe Black- Access to physical memory region (> 4GB)
221740fef049SGabe Black		Some basic support is provided for operations on memory not
221840fef049SGabe Black		normally accessible to U-Boot - e.g. some architectures
221940fef049SGabe Black		support access to more than 4GB of memory on 32-bit
222040fef049SGabe Black		machines using physical address extension or similar.
222140fef049SGabe Black		Define CONFIG_PHYSMEM to access this basic support, which
222240fef049SGabe Black		currently only supports clearing the memory.
222340fef049SGabe Black
2224c609719bSwdenk- Error Recovery:
2225c609719bSwdenk		CONFIG_PANIC_HANG
2226c609719bSwdenk
2227c609719bSwdenk		Define this variable to stop the system in case of a
2228c609719bSwdenk		fatal error, so that you have to reset it manually.
2229c609719bSwdenk		This is probably NOT a good idea for an embedded
223011ccc33fSMarcel Ziswiler		system where you want the system to reboot
2231c609719bSwdenk		automatically as fast as possible, but it may be
2232c609719bSwdenk		useful during development since you can try to debug
2233c609719bSwdenk		the conditions that lead to the situation.
2234c609719bSwdenk
2235c609719bSwdenk		CONFIG_NET_RETRY_COUNT
2236c609719bSwdenk
2237c609719bSwdenk		This variable defines the number of retries for
2238c609719bSwdenk		network operations like ARP, RARP, TFTP, or BOOTP
2239c609719bSwdenk		before giving up the operation. If not defined, a
2240c609719bSwdenk		default value of 5 is used.
2241c609719bSwdenk
224240cb90eeSGuennadi Liakhovetski		CONFIG_ARP_TIMEOUT
224340cb90eeSGuennadi Liakhovetski
224440cb90eeSGuennadi Liakhovetski		Timeout waiting for an ARP reply in milliseconds.
224540cb90eeSGuennadi Liakhovetski
224648a3e999STetsuyuki Kobayashi		CONFIG_NFS_TIMEOUT
224748a3e999STetsuyuki Kobayashi
224848a3e999STetsuyuki Kobayashi		Timeout in milliseconds used in NFS protocol.
224948a3e999STetsuyuki Kobayashi		If you encounter "ERROR: Cannot umount" in nfs command,
225048a3e999STetsuyuki Kobayashi		try longer timeout such as
225148a3e999STetsuyuki Kobayashi		#define CONFIG_NFS_TIMEOUT 10000UL
225248a3e999STetsuyuki Kobayashi
2253c609719bSwdenk- Command Interpreter:
22548078f1a5SWolfgang Denk		CONFIG_AUTO_COMPLETE
225504a85b3bSwdenk
225604a85b3bSwdenk		Enable auto completion of commands using TAB.
225704a85b3bSwdenk
22588078f1a5SWolfgang Denk		Note that this feature has NOT been implemented yet
22598078f1a5SWolfgang Denk		for the "hush" shell.
22608078f1a5SWolfgang Denk
22618078f1a5SWolfgang Denk
22626d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_HUSH_PARSER
2263c609719bSwdenk
2264c609719bSwdenk		Define this variable to enable the "hush" shell (from
2265c609719bSwdenk		Busybox) as command line interpreter, thus enabling
2266c609719bSwdenk		powerful command line syntax like
2267c609719bSwdenk		if...then...else...fi conditionals or `&&' and '||'
2268c609719bSwdenk		constructs ("shell scripts").
2269c609719bSwdenk
2270c609719bSwdenk		If undefined, you get the old, much simpler behaviour
2271c609719bSwdenk		with a somewhat smaller memory footprint.
2272c609719bSwdenk
2273c609719bSwdenk
22746d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_PROMPT_HUSH_PS2
2275c609719bSwdenk
2276c609719bSwdenk		This defines the secondary prompt string, which is
2277c609719bSwdenk		printed when the command interpreter needs more input
2278c609719bSwdenk		to complete a command. Usually "> ".
2279c609719bSwdenk
2280c609719bSwdenk	Note:
2281c609719bSwdenk
2282c609719bSwdenk		In the current implementation, the local variables
2283c609719bSwdenk		space and global environment variables space are
2284c609719bSwdenk		separated. Local variables are those you define by
22853b57fe0aSwdenk		simply typing `name=value'. To access a local
2286c609719bSwdenk		variable later on, you have write `$name' or
22873b57fe0aSwdenk		`${name}'; to execute the contents of a variable
22883b57fe0aSwdenk		directly type `$name' at the command prompt.
2289c609719bSwdenk
2290c609719bSwdenk		Global environment variables are those you use
2291c609719bSwdenk		setenv/printenv to work with. To run a command stored
2292c609719bSwdenk		in such a variable, you need to use the run command,
2293c609719bSwdenk		and you must not use the '$' sign to access them.
2294c609719bSwdenk
2295c609719bSwdenk		To store commands and special characters in a
2296c609719bSwdenk		variable, please use double quotation marks
2297c609719bSwdenk		surrounding the whole text of the variable, instead
2298c609719bSwdenk		of the backslashes before semicolons and special
2299c609719bSwdenk		symbols.
2300c609719bSwdenk
2301aa0c71acSWolfgang Denk- Commandline Editing and History:
2302aa0c71acSWolfgang Denk		CONFIG_CMDLINE_EDITING
2303aa0c71acSWolfgang Denk
230411ccc33fSMarcel Ziswiler		Enable editing and History functions for interactive
2305aa0c71acSWolfgang Denk		commandline input operations
2306aa0c71acSWolfgang Denk
2307a8c7c708Swdenk- Default Environment:
2308c609719bSwdenk		CONFIG_EXTRA_ENV_SETTINGS
2309c609719bSwdenk
2310c609719bSwdenk		Define this to contain any number of null terminated
2311c609719bSwdenk		strings (variable = value pairs) that will be part of
23127152b1d0Swdenk		the default environment compiled into the boot image.
23132262cfeeSwdenk
2314c609719bSwdenk		For example, place something like this in your
2315c609719bSwdenk		board's config file:
2316c609719bSwdenk
2317c609719bSwdenk		#define CONFIG_EXTRA_ENV_SETTINGS \
2318c609719bSwdenk			"myvar1=value1\0" \
2319c609719bSwdenk			"myvar2=value2\0"
2320c609719bSwdenk
2321c609719bSwdenk		Warning: This method is based on knowledge about the
2322c609719bSwdenk		internal format how the environment is stored by the
23232262cfeeSwdenk		U-Boot code. This is NOT an official, exported
2324c609719bSwdenk		interface! Although it is unlikely that this format
23257152b1d0Swdenk		will change soon, there is no guarantee either.
2326c609719bSwdenk		You better know what you are doing here.
2327c609719bSwdenk
2328c609719bSwdenk		Note: overly (ab)use of the default environment is
2329c609719bSwdenk		discouraged. Make sure to check other ways to preset
233074de7aefSWolfgang Denk		the environment like the "source" command or the
2331c609719bSwdenk		boot command first.
2332c609719bSwdenk
23335e724ca2SStephen Warren		CONFIG_ENV_VARS_UBOOT_CONFIG
23345e724ca2SStephen Warren
23355e724ca2SStephen Warren		Define this in order to add variables describing the
23365e724ca2SStephen Warren		U-Boot build configuration to the default environment.
23375e724ca2SStephen Warren		These will be named arch, cpu, board, vendor, and soc.
23385e724ca2SStephen Warren
23395e724ca2SStephen Warren		Enabling this option will cause the following to be defined:
23405e724ca2SStephen Warren
23415e724ca2SStephen Warren		- CONFIG_SYS_ARCH
23425e724ca2SStephen Warren		- CONFIG_SYS_CPU
23435e724ca2SStephen Warren		- CONFIG_SYS_BOARD
23445e724ca2SStephen Warren		- CONFIG_SYS_VENDOR
23455e724ca2SStephen Warren		- CONFIG_SYS_SOC
23465e724ca2SStephen Warren
23477e27f89fSTom Rini		CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
23487e27f89fSTom Rini
23497e27f89fSTom Rini		Define this in order to add variables describing certain
23507e27f89fSTom Rini		run-time determined information about the hardware to the
23517e27f89fSTom Rini		environment.  These will be named board_name, board_rev.
23527e27f89fSTom Rini
2353a8c7c708Swdenk- DataFlash Support:
23542abbe075Swdenk		CONFIG_HAS_DATAFLASH
23552abbe075Swdenk
23562abbe075Swdenk		Defining this option enables DataFlash features and
23572abbe075Swdenk		allows to read/write in Dataflash via the standard
23582abbe075Swdenk		commands cp, md...
23592abbe075Swdenk
2360f61ec45eSEric Nelson- Serial Flash support
2361f61ec45eSEric Nelson		CONFIG_CMD_SF
2362f61ec45eSEric Nelson
2363f61ec45eSEric Nelson		Defining this option enables SPI flash commands
2364f61ec45eSEric Nelson		'sf probe/read/write/erase/update'.
2365f61ec45eSEric Nelson
2366f61ec45eSEric Nelson		Usage requires an initial 'probe' to define the serial
2367f61ec45eSEric Nelson		flash parameters, followed by read/write/erase/update
2368f61ec45eSEric Nelson		commands.
2369f61ec45eSEric Nelson
2370f61ec45eSEric Nelson		The following defaults may be provided by the platform
2371f61ec45eSEric Nelson		to handle the common case when only a single serial
2372f61ec45eSEric Nelson		flash is present on the system.
2373f61ec45eSEric Nelson
2374f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_BUS		Bus identifier
2375f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_CS		Chip-select
2376f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_MODE 		(see include/spi.h)
2377f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_SPEED		in Hz
2378f61ec45eSEric Nelson
23793f85ce27Swdenk- SystemACE Support:
23803f85ce27Swdenk		CONFIG_SYSTEMACE
23813f85ce27Swdenk
23823f85ce27Swdenk		Adding this option adds support for Xilinx SystemACE
23833f85ce27Swdenk		chips attached via some sort of local bus. The address
238411ccc33fSMarcel Ziswiler		of the chip must also be defined in the
23856d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SYSTEMACE_BASE macro. For example:
23863f85ce27Swdenk
23873f85ce27Swdenk		#define CONFIG_SYSTEMACE
23886d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		#define CONFIG_SYS_SYSTEMACE_BASE 0xf0000000
23893f85ce27Swdenk
23903f85ce27Swdenk		When SystemACE support is added, the "ace" device type
23913f85ce27Swdenk		becomes available to the fat commands, i.e. fatls.
23923f85ce27Swdenk
2393ecb0ccd9SWolfgang Denk- TFTP Fixed UDP Port:
2394ecb0ccd9SWolfgang Denk		CONFIG_TFTP_PORT
2395ecb0ccd9SWolfgang Denk
239628cb9375SWolfgang Denk		If this is defined, the environment variable tftpsrcp
2397ecb0ccd9SWolfgang Denk		is used to supply the TFTP UDP source port value.
239828cb9375SWolfgang Denk		If tftpsrcp isn't defined, the normal pseudo-random port
2399ecb0ccd9SWolfgang Denk		number generator is used.
2400ecb0ccd9SWolfgang Denk
240128cb9375SWolfgang Denk		Also, the environment variable tftpdstp is used to supply
240228cb9375SWolfgang Denk		the TFTP UDP destination port value.  If tftpdstp isn't
240328cb9375SWolfgang Denk		defined, the normal port 69 is used.
240428cb9375SWolfgang Denk
240528cb9375SWolfgang Denk		The purpose for tftpsrcp is to allow a TFTP server to
2406ecb0ccd9SWolfgang Denk		blindly start the TFTP transfer using the pre-configured
2407ecb0ccd9SWolfgang Denk		target IP address and UDP port. This has the effect of
2408ecb0ccd9SWolfgang Denk		"punching through" the (Windows XP) firewall, allowing
2409ecb0ccd9SWolfgang Denk		the remainder of the TFTP transfer to proceed normally.
2410ecb0ccd9SWolfgang Denk		A better solution is to properly configure the firewall,
2411ecb0ccd9SWolfgang Denk		but sometimes that is not allowed.
2412ecb0ccd9SWolfgang Denk
2413a8c7c708Swdenk- Show boot progress:
2414c609719bSwdenk		CONFIG_SHOW_BOOT_PROGRESS
2415c609719bSwdenk
2416c609719bSwdenk		Defining this option allows to add some board-
2417c609719bSwdenk		specific code (calling a user-provided function
2418c609719bSwdenk		"show_boot_progress(int)") that enables you to show
2419c609719bSwdenk		the system's boot progress on some display (for
2420c609719bSwdenk		example, some LED's) on your board. At the moment,
2421c609719bSwdenk		the following checkpoints are implemented:
2422c609719bSwdenk
24233a608ca0SSimon Glass- Detailed boot stage timing
24243a608ca0SSimon Glass		CONFIG_BOOTSTAGE
24253a608ca0SSimon Glass		Define this option to get detailed timing of each stage
24263a608ca0SSimon Glass		of the boot process.
24273a608ca0SSimon Glass
24283a608ca0SSimon Glass		CONFIG_BOOTSTAGE_USER_COUNT
24293a608ca0SSimon Glass		This is the number of available user bootstage records.
24303a608ca0SSimon Glass		Each time you call bootstage_mark(BOOTSTAGE_ID_ALLOC, ...)
24313a608ca0SSimon Glass		a new ID will be allocated from this stash. If you exceed
24323a608ca0SSimon Glass		the limit, recording will stop.
24333a608ca0SSimon Glass
24343a608ca0SSimon Glass		CONFIG_BOOTSTAGE_REPORT
24353a608ca0SSimon Glass		Define this to print a report before boot, similar to this:
24363a608ca0SSimon Glass
24373a608ca0SSimon Glass		Timer summary in microseconds:
24383a608ca0SSimon Glass		       Mark    Elapsed  Stage
24393a608ca0SSimon Glass			  0          0  reset
24403a608ca0SSimon Glass		  3,575,678  3,575,678  board_init_f start
24413a608ca0SSimon Glass		  3,575,695         17  arch_cpu_init A9
24423a608ca0SSimon Glass		  3,575,777         82  arch_cpu_init done
24433a608ca0SSimon Glass		  3,659,598     83,821  board_init_r start
24443a608ca0SSimon Glass		  3,910,375    250,777  main_loop
24453a608ca0SSimon Glass		 29,916,167 26,005,792  bootm_start
24463a608ca0SSimon Glass		 30,361,327    445,160  start_kernel
24473a608ca0SSimon Glass
24482eba38cfSSimon Glass		CONFIG_CMD_BOOTSTAGE
24492eba38cfSSimon Glass		Add a 'bootstage' command which supports printing a report
24502eba38cfSSimon Glass		and un/stashing of bootstage data.
24512eba38cfSSimon Glass
245294fd1316SSimon Glass		CONFIG_BOOTSTAGE_FDT
245394fd1316SSimon Glass		Stash the bootstage information in the FDT. A root 'bootstage'
245494fd1316SSimon Glass		node is created with each bootstage id as a child. Each child
245594fd1316SSimon Glass		has a 'name' property and either 'mark' containing the
245694fd1316SSimon Glass		mark time in microsecond, or 'accum' containing the
245794fd1316SSimon Glass		accumulated time for that bootstage id in microseconds.
245894fd1316SSimon Glass		For example:
245994fd1316SSimon Glass
246094fd1316SSimon Glass		bootstage {
246194fd1316SSimon Glass			154 {
246294fd1316SSimon Glass				name = "board_init_f";
246394fd1316SSimon Glass				mark = <3575678>;
246494fd1316SSimon Glass			};
246594fd1316SSimon Glass			170 {
246694fd1316SSimon Glass				name = "lcd";
246794fd1316SSimon Glass				accum = <33482>;
246894fd1316SSimon Glass			};
246994fd1316SSimon Glass		};
247094fd1316SSimon Glass
247194fd1316SSimon Glass		Code in the Linux kernel can find this in /proc/devicetree.
247294fd1316SSimon Glass
24731372cce2SMarian BalakowiczLegacy uImage format:
24741372cce2SMarian Balakowicz
2475c609719bSwdenk  Arg	Where			When
2476c609719bSwdenk    1	common/cmd_bootm.c	before attempting to boot an image
2477c609719bSwdenk   -1	common/cmd_bootm.c	Image header has bad	 magic number
2478c609719bSwdenk    2	common/cmd_bootm.c	Image header has correct magic number
2479c609719bSwdenk   -2	common/cmd_bootm.c	Image header has bad	 checksum
2480c609719bSwdenk    3	common/cmd_bootm.c	Image header has correct checksum
2481c609719bSwdenk   -3	common/cmd_bootm.c	Image data   has bad	 checksum
2482c609719bSwdenk    4	common/cmd_bootm.c	Image data   has correct checksum
2483c609719bSwdenk   -4	common/cmd_bootm.c	Image is for unsupported architecture
2484c609719bSwdenk    5	common/cmd_bootm.c	Architecture check OK
24851372cce2SMarian Balakowicz   -5	common/cmd_bootm.c	Wrong Image Type (not kernel, multi)
2486c609719bSwdenk    6	common/cmd_bootm.c	Image Type check OK
2487c609719bSwdenk   -6	common/cmd_bootm.c	gunzip uncompression error
2488c609719bSwdenk   -7	common/cmd_bootm.c	Unimplemented compression type
2489c609719bSwdenk    7	common/cmd_bootm.c	Uncompression OK
24901372cce2SMarian Balakowicz    8	common/cmd_bootm.c	No uncompress/copy overwrite error
2491c609719bSwdenk   -9	common/cmd_bootm.c	Unsupported OS (not Linux, BSD, VxWorks, QNX)
24921372cce2SMarian Balakowicz
24931372cce2SMarian Balakowicz    9	common/image.c		Start initial ramdisk verification
24941372cce2SMarian Balakowicz  -10	common/image.c		Ramdisk header has bad	   magic number
24951372cce2SMarian Balakowicz  -11	common/image.c		Ramdisk header has bad	   checksum
24961372cce2SMarian Balakowicz   10	common/image.c		Ramdisk header is OK
24971372cce2SMarian Balakowicz  -12	common/image.c		Ramdisk data   has bad	   checksum
24981372cce2SMarian Balakowicz   11	common/image.c		Ramdisk data   has correct checksum
24991372cce2SMarian Balakowicz   12	common/image.c		Ramdisk verification complete, start loading
250011ccc33fSMarcel Ziswiler  -13	common/image.c		Wrong Image Type (not PPC Linux ramdisk)
25011372cce2SMarian Balakowicz   13	common/image.c		Start multifile image verification
25021372cce2SMarian Balakowicz   14	common/image.c		No initial ramdisk, no multifile, continue.
25031372cce2SMarian Balakowicz
2504ea0364f1SPeter Tyser   15	arch/<arch>/lib/bootm.c All preparation done, transferring control to OS
2505c609719bSwdenk
2506a47a12beSStefan Roese  -30	arch/powerpc/lib/board.c	Fatal error, hang the system
250763e73c9aSwdenk  -31	post/post.c		POST test failed, detected by post_output_backlog()
250863e73c9aSwdenk  -32	post/post.c		POST test failed, detected by post_run_single()
250963e73c9aSwdenk
2510566a494fSHeiko Schocher   34	common/cmd_doc.c	before loading a Image from a DOC device
2511566a494fSHeiko Schocher  -35	common/cmd_doc.c	Bad usage of "doc" command
2512566a494fSHeiko Schocher   35	common/cmd_doc.c	correct usage of "doc" command
2513566a494fSHeiko Schocher  -36	common/cmd_doc.c	No boot device
2514566a494fSHeiko Schocher   36	common/cmd_doc.c	correct boot device
2515566a494fSHeiko Schocher  -37	common/cmd_doc.c	Unknown Chip ID on boot device
2516566a494fSHeiko Schocher   37	common/cmd_doc.c	correct chip ID found, device available
2517566a494fSHeiko Schocher  -38	common/cmd_doc.c	Read Error on boot device
2518566a494fSHeiko Schocher   38	common/cmd_doc.c	reading Image header from DOC device OK
2519566a494fSHeiko Schocher  -39	common/cmd_doc.c	Image header has bad magic number
2520566a494fSHeiko Schocher   39	common/cmd_doc.c	Image header has correct magic number
2521566a494fSHeiko Schocher  -40	common/cmd_doc.c	Error reading Image from DOC device
2522566a494fSHeiko Schocher   40	common/cmd_doc.c	Image header has correct magic number
2523566a494fSHeiko Schocher   41	common/cmd_ide.c	before loading a Image from a IDE device
2524566a494fSHeiko Schocher  -42	common/cmd_ide.c	Bad usage of "ide" command
2525566a494fSHeiko Schocher   42	common/cmd_ide.c	correct usage of "ide" command
2526566a494fSHeiko Schocher  -43	common/cmd_ide.c	No boot device
2527566a494fSHeiko Schocher   43	common/cmd_ide.c	boot device found
2528566a494fSHeiko Schocher  -44	common/cmd_ide.c	Device not available
2529566a494fSHeiko Schocher   44	common/cmd_ide.c	Device available
2530566a494fSHeiko Schocher  -45	common/cmd_ide.c	wrong partition selected
2531566a494fSHeiko Schocher   45	common/cmd_ide.c	partition selected
2532566a494fSHeiko Schocher  -46	common/cmd_ide.c	Unknown partition table
2533566a494fSHeiko Schocher   46	common/cmd_ide.c	valid partition table found
2534566a494fSHeiko Schocher  -47	common/cmd_ide.c	Invalid partition type
2535566a494fSHeiko Schocher   47	common/cmd_ide.c	correct partition type
2536566a494fSHeiko Schocher  -48	common/cmd_ide.c	Error reading Image Header on boot device
2537566a494fSHeiko Schocher   48	common/cmd_ide.c	reading Image Header from IDE device OK
2538566a494fSHeiko Schocher  -49	common/cmd_ide.c	Image header has bad magic number
2539566a494fSHeiko Schocher   49	common/cmd_ide.c	Image header has correct magic number
2540566a494fSHeiko Schocher  -50	common/cmd_ide.c	Image header has bad	 checksum
2541566a494fSHeiko Schocher   50	common/cmd_ide.c	Image header has correct checksum
2542566a494fSHeiko Schocher  -51	common/cmd_ide.c	Error reading Image from IDE device
2543566a494fSHeiko Schocher   51	common/cmd_ide.c	reading Image from IDE device OK
2544566a494fSHeiko Schocher   52	common/cmd_nand.c	before loading a Image from a NAND device
2545566a494fSHeiko Schocher  -53	common/cmd_nand.c	Bad usage of "nand" command
2546566a494fSHeiko Schocher   53	common/cmd_nand.c	correct usage of "nand" command
2547566a494fSHeiko Schocher  -54	common/cmd_nand.c	No boot device
2548566a494fSHeiko Schocher   54	common/cmd_nand.c	boot device found
2549566a494fSHeiko Schocher  -55	common/cmd_nand.c	Unknown Chip ID on boot device
2550566a494fSHeiko Schocher   55	common/cmd_nand.c	correct chip ID found, device available
2551566a494fSHeiko Schocher  -56	common/cmd_nand.c	Error reading Image Header on boot device
2552566a494fSHeiko Schocher   56	common/cmd_nand.c	reading Image Header from NAND device OK
2553566a494fSHeiko Schocher  -57	common/cmd_nand.c	Image header has bad magic number
2554566a494fSHeiko Schocher   57	common/cmd_nand.c	Image header has correct magic number
2555566a494fSHeiko Schocher  -58	common/cmd_nand.c	Error reading Image from NAND device
2556566a494fSHeiko Schocher   58	common/cmd_nand.c	reading Image from NAND device OK
2557c609719bSwdenk
2558566a494fSHeiko Schocher  -60	common/env_common.c	Environment has a bad CRC, using default
2559c609719bSwdenk
2560566a494fSHeiko Schocher   64	net/eth.c		starting with Ethernet configuration.
2561566a494fSHeiko Schocher  -64	net/eth.c		no Ethernet found.
2562566a494fSHeiko Schocher   65	net/eth.c		Ethernet found.
2563206c60cbSwdenk
2564566a494fSHeiko Schocher  -80	common/cmd_net.c	usage wrong
2565566a494fSHeiko Schocher   80	common/cmd_net.c	before calling NetLoop()
256611ccc33fSMarcel Ziswiler  -81	common/cmd_net.c	some error in NetLoop() occurred
2567566a494fSHeiko Schocher   81	common/cmd_net.c	NetLoop() back without error
2568566a494fSHeiko Schocher  -82	common/cmd_net.c	size == 0 (File with size 0 loaded)
2569566a494fSHeiko Schocher   82	common/cmd_net.c	trying automatic boot
257074de7aefSWolfgang Denk   83	common/cmd_net.c	running "source" command
257174de7aefSWolfgang Denk  -83	common/cmd_net.c	some error in automatic boot or "source" command
2572566a494fSHeiko Schocher   84	common/cmd_net.c	end without errors
2573c609719bSwdenk
25741372cce2SMarian BalakowiczFIT uImage format:
25751372cce2SMarian Balakowicz
25761372cce2SMarian Balakowicz  Arg	Where			When
25771372cce2SMarian Balakowicz  100	common/cmd_bootm.c	Kernel FIT Image has correct format
25781372cce2SMarian Balakowicz -100	common/cmd_bootm.c	Kernel FIT Image has incorrect format
25791372cce2SMarian Balakowicz  101	common/cmd_bootm.c	No Kernel subimage unit name, using configuration
25801372cce2SMarian Balakowicz -101	common/cmd_bootm.c	Can't get configuration for kernel subimage
25811372cce2SMarian Balakowicz  102	common/cmd_bootm.c	Kernel unit name specified
25821372cce2SMarian Balakowicz -103	common/cmd_bootm.c	Can't get kernel subimage node offset
2583f773bea8SMarian Balakowicz  103	common/cmd_bootm.c	Found configuration node
25841372cce2SMarian Balakowicz  104	common/cmd_bootm.c	Got kernel subimage node offset
25851372cce2SMarian Balakowicz -104	common/cmd_bootm.c	Kernel subimage hash verification failed
25861372cce2SMarian Balakowicz  105	common/cmd_bootm.c	Kernel subimage hash verification OK
25871372cce2SMarian Balakowicz -105	common/cmd_bootm.c	Kernel subimage is for unsupported architecture
25881372cce2SMarian Balakowicz  106	common/cmd_bootm.c	Architecture check OK
258911ccc33fSMarcel Ziswiler -106	common/cmd_bootm.c	Kernel subimage has wrong type
259011ccc33fSMarcel Ziswiler  107	common/cmd_bootm.c	Kernel subimage type OK
25911372cce2SMarian Balakowicz -107	common/cmd_bootm.c	Can't get kernel subimage data/size
25921372cce2SMarian Balakowicz  108	common/cmd_bootm.c	Got kernel subimage data/size
25931372cce2SMarian Balakowicz -108	common/cmd_bootm.c	Wrong image type (not legacy, FIT)
25941372cce2SMarian Balakowicz -109	common/cmd_bootm.c	Can't get kernel subimage type
25951372cce2SMarian Balakowicz -110	common/cmd_bootm.c	Can't get kernel subimage comp
25961372cce2SMarian Balakowicz -111	common/cmd_bootm.c	Can't get kernel subimage os
25971372cce2SMarian Balakowicz -112	common/cmd_bootm.c	Can't get kernel subimage load address
25981372cce2SMarian Balakowicz -113	common/cmd_bootm.c	Image uncompress/copy overwrite error
25991372cce2SMarian Balakowicz
26001372cce2SMarian Balakowicz  120	common/image.c		Start initial ramdisk verification
26011372cce2SMarian Balakowicz -120	common/image.c		Ramdisk FIT image has incorrect format
26021372cce2SMarian Balakowicz  121	common/image.c		Ramdisk FIT image has correct format
260311ccc33fSMarcel Ziswiler  122	common/image.c		No ramdisk subimage unit name, using configuration
26041372cce2SMarian Balakowicz -122	common/image.c		Can't get configuration for ramdisk subimage
26051372cce2SMarian Balakowicz  123	common/image.c		Ramdisk unit name specified
26061372cce2SMarian Balakowicz -124	common/image.c		Can't get ramdisk subimage node offset
26071372cce2SMarian Balakowicz  125	common/image.c		Got ramdisk subimage node offset
26081372cce2SMarian Balakowicz -125	common/image.c		Ramdisk subimage hash verification failed
26091372cce2SMarian Balakowicz  126	common/image.c		Ramdisk subimage hash verification OK
26101372cce2SMarian Balakowicz -126	common/image.c		Ramdisk subimage for unsupported architecture
26111372cce2SMarian Balakowicz  127	common/image.c		Architecture check OK
26121372cce2SMarian Balakowicz -127	common/image.c		Can't get ramdisk subimage data/size
26131372cce2SMarian Balakowicz  128	common/image.c		Got ramdisk subimage data/size
26141372cce2SMarian Balakowicz  129	common/image.c		Can't get ramdisk load address
26151372cce2SMarian Balakowicz -129	common/image.c		Got ramdisk load address
26161372cce2SMarian Balakowicz
261711ccc33fSMarcel Ziswiler -130	common/cmd_doc.c	Incorrect FIT image format
26181372cce2SMarian Balakowicz  131	common/cmd_doc.c	FIT image format OK
26191372cce2SMarian Balakowicz
262011ccc33fSMarcel Ziswiler -140	common/cmd_ide.c	Incorrect FIT image format
26211372cce2SMarian Balakowicz  141	common/cmd_ide.c	FIT image format OK
26221372cce2SMarian Balakowicz
262311ccc33fSMarcel Ziswiler -150	common/cmd_nand.c	Incorrect FIT image format
26241372cce2SMarian Balakowicz  151	common/cmd_nand.c	FIT image format OK
26251372cce2SMarian Balakowicz
2626d95f6ec7SGabe Black- FIT image support:
2627d95f6ec7SGabe Black		CONFIG_FIT
2628d95f6ec7SGabe Black		Enable support for the FIT uImage format.
2629d95f6ec7SGabe Black
2630d95f6ec7SGabe Black		CONFIG_FIT_BEST_MATCH
2631d95f6ec7SGabe Black		When no configuration is explicitly selected, default to the
2632d95f6ec7SGabe Black		one whose fdt's compatibility field best matches that of
2633d95f6ec7SGabe Black		U-Boot itself. A match is considered "best" if it matches the
2634d95f6ec7SGabe Black		most specific compatibility entry of U-Boot's fdt's root node.
2635d95f6ec7SGabe Black		The order of entries in the configuration's fdt is ignored.
2636d95f6ec7SGabe Black
26374cf2609bSWolfgang Denk- Standalone program support:
26384cf2609bSWolfgang Denk		CONFIG_STANDALONE_LOAD_ADDR
26394cf2609bSWolfgang Denk
26406feff899SWolfgang Denk		This option defines a board specific value for the
26416feff899SWolfgang Denk		address where standalone program gets loaded, thus
26426feff899SWolfgang Denk		overwriting the architecture dependent default
26434cf2609bSWolfgang Denk		settings.
26444cf2609bSWolfgang Denk
26454cf2609bSWolfgang Denk- Frame Buffer Address:
26464cf2609bSWolfgang Denk		CONFIG_FB_ADDR
26474cf2609bSWolfgang Denk
26484cf2609bSWolfgang Denk		Define CONFIG_FB_ADDR if you want to use specific
26494cf2609bSWolfgang Denk		address for frame buffer.
26504cf2609bSWolfgang Denk		Then system will reserve the frame buffer address to
26514cf2609bSWolfgang Denk		defined address instead of lcd_setmem (this function
26526feff899SWolfgang Denk		grabs the memory for frame buffer by panel's size).
26534cf2609bSWolfgang Denk
26544cf2609bSWolfgang Denk		Please see board_init_f function.
26554cf2609bSWolfgang Denk
2656cccfc2abSDetlev Zundel- Automatic software updates via TFTP server
2657cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP
2658cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP_CNT_MAX
2659cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP_MSEC_MAX
2660cccfc2abSDetlev Zundel
2661cccfc2abSDetlev Zundel		These options enable and control the auto-update feature;
2662cccfc2abSDetlev Zundel		for a more detailed description refer to doc/README.update.
2663cccfc2abSDetlev Zundel
2664cccfc2abSDetlev Zundel- MTD Support (mtdparts command, UBI support)
2665cccfc2abSDetlev Zundel		CONFIG_MTD_DEVICE
2666cccfc2abSDetlev Zundel
2667cccfc2abSDetlev Zundel		Adds the MTD device infrastructure from the Linux kernel.
2668cccfc2abSDetlev Zundel		Needed for mtdparts command support.
2669cccfc2abSDetlev Zundel
2670cccfc2abSDetlev Zundel		CONFIG_MTD_PARTITIONS
2671cccfc2abSDetlev Zundel
2672cccfc2abSDetlev Zundel		Adds the MTD partitioning infrastructure from the Linux
2673cccfc2abSDetlev Zundel		kernel. Needed for UBI support.
2674cccfc2abSDetlev Zundel
26756a11cf48SDaniel Schwierzeck- SPL framework
26766a11cf48SDaniel Schwierzeck		CONFIG_SPL
26776a11cf48SDaniel Schwierzeck		Enable building of SPL globally.
26786a11cf48SDaniel Schwierzeck
267995579793STom Rini		CONFIG_SPL_LDSCRIPT
268095579793STom Rini		LDSCRIPT for linking the SPL binary.
268195579793STom Rini
268295579793STom Rini		CONFIG_SPL_MAX_SIZE
268395579793STom Rini		Maximum binary size (text, data and rodata) of the SPL binary.
268495579793STom Rini
26856a11cf48SDaniel Schwierzeck		CONFIG_SPL_TEXT_BASE
26866a11cf48SDaniel Schwierzeck		TEXT_BASE for linking the SPL binary.
26876a11cf48SDaniel Schwierzeck
268894a45bb1SScott Wood		CONFIG_SPL_RELOC_TEXT_BASE
268994a45bb1SScott Wood		Address to relocate to.  If unspecified, this is equal to
269094a45bb1SScott Wood		CONFIG_SPL_TEXT_BASE (i.e. no relocation is done).
269194a45bb1SScott Wood
269295579793STom Rini		CONFIG_SPL_BSS_START_ADDR
269395579793STom Rini		Link address for the BSS within the SPL binary.
269495579793STom Rini
269595579793STom Rini		CONFIG_SPL_BSS_MAX_SIZE
269695579793STom Rini		Maximum binary size of the BSS section of the SPL binary.
269795579793STom Rini
269895579793STom Rini		CONFIG_SPL_STACK
269995579793STom Rini		Adress of the start of the stack SPL will use
270095579793STom Rini
270194a45bb1SScott Wood		CONFIG_SPL_RELOC_STACK
270294a45bb1SScott Wood		Adress of the start of the stack SPL will use after
270394a45bb1SScott Wood		relocation.  If unspecified, this is equal to
270494a45bb1SScott Wood		CONFIG_SPL_STACK.
270594a45bb1SScott Wood
270695579793STom Rini		CONFIG_SYS_SPL_MALLOC_START
270795579793STom Rini		Starting address of the malloc pool used in SPL.
270895579793STom Rini
270995579793STom Rini		CONFIG_SYS_SPL_MALLOC_SIZE
271095579793STom Rini		The size of the malloc pool used in SPL.
27116a11cf48SDaniel Schwierzeck
271247f7bcaeSTom Rini		CONFIG_SPL_FRAMEWORK
271347f7bcaeSTom Rini		Enable the SPL framework under common/.  This framework
271447f7bcaeSTom Rini		supports MMC, NAND and YMODEM loading of U-Boot and NAND
271547f7bcaeSTom Rini		NAND loading of the Linux Kernel.
271647f7bcaeSTom Rini
2717861a86f4STom Rini		CONFIG_SPL_DISPLAY_PRINT
2718861a86f4STom Rini		For ARM, enable an optional function to print more information
2719861a86f4STom Rini		about the running system.
2720861a86f4STom Rini
27214b919725SScott Wood		CONFIG_SPL_INIT_MINIMAL
27224b919725SScott Wood		Arch init code should be built for a very small image
27234b919725SScott Wood
27246a11cf48SDaniel Schwierzeck		CONFIG_SPL_LIBCOMMON_SUPPORT
27256a11cf48SDaniel Schwierzeck		Support for common/libcommon.o in SPL binary
27266a11cf48SDaniel Schwierzeck
27276a11cf48SDaniel Schwierzeck		CONFIG_SPL_LIBDISK_SUPPORT
27286a11cf48SDaniel Schwierzeck		Support for disk/libdisk.o in SPL binary
27296a11cf48SDaniel Schwierzeck
27306a11cf48SDaniel Schwierzeck		CONFIG_SPL_I2C_SUPPORT
27316a11cf48SDaniel Schwierzeck		Support for drivers/i2c/libi2c.o in SPL binary
27326a11cf48SDaniel Schwierzeck
27336a11cf48SDaniel Schwierzeck		CONFIG_SPL_GPIO_SUPPORT
27346a11cf48SDaniel Schwierzeck		Support for drivers/gpio/libgpio.o in SPL binary
27356a11cf48SDaniel Schwierzeck
27366a11cf48SDaniel Schwierzeck		CONFIG_SPL_MMC_SUPPORT
27376a11cf48SDaniel Schwierzeck		Support for drivers/mmc/libmmc.o in SPL binary
27386a11cf48SDaniel Schwierzeck
273995579793STom Rini		CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR,
274095579793STom Rini		CONFIG_SYS_U_BOOT_MAX_SIZE_SECTORS,
274195579793STom Rini		CONFIG_SYS_MMC_SD_FAT_BOOT_PARTITION
274295579793STom Rini		Address, size and partition on the MMC to load U-Boot from
274395579793STom Rini		when the MMC is being used in raw mode.
274495579793STom Rini
274595579793STom Rini		CONFIG_SPL_FAT_SUPPORT
274695579793STom Rini		Support for fs/fat/libfat.o in SPL binary
274795579793STom Rini
274895579793STom Rini		CONFIG_SPL_FAT_LOAD_PAYLOAD_NAME
274995579793STom Rini		Filename to read to load U-Boot when reading from FAT
275095579793STom Rini
27516f2f01b9SScott Wood		CONFIG_SPL_NAND_BASE
27526f2f01b9SScott Wood		Include nand_base.c in the SPL.  Requires
27536f2f01b9SScott Wood		CONFIG_SPL_NAND_DRIVERS.
27546f2f01b9SScott Wood
27556f2f01b9SScott Wood		CONFIG_SPL_NAND_DRIVERS
27566f2f01b9SScott Wood		SPL uses normal NAND drivers, not minimal drivers.
27576f2f01b9SScott Wood
27586f2f01b9SScott Wood		CONFIG_SPL_NAND_ECC
27596f2f01b9SScott Wood		Include standard software ECC in the SPL
27606f2f01b9SScott Wood
276195579793STom Rini		CONFIG_SPL_NAND_SIMPLE
27627d4b7955SScott Wood		Support for NAND boot using simple NAND drivers that
27637d4b7955SScott Wood		expose the cmd_ctrl() interface.
276495579793STom Rini
276595579793STom Rini		CONFIG_SYS_NAND_5_ADDR_CYCLE, CONFIG_SYS_NAND_PAGE_COUNT,
276695579793STom Rini		CONFIG_SYS_NAND_PAGE_SIZE, CONFIG_SYS_NAND_OOBSIZE,
276795579793STom Rini		CONFIG_SYS_NAND_BLOCK_SIZE, CONFIG_SYS_NAND_BAD_BLOCK_POS,
276895579793STom Rini		CONFIG_SYS_NAND_ECCPOS, CONFIG_SYS_NAND_ECCSIZE,
276995579793STom Rini		CONFIG_SYS_NAND_ECCBYTES
277095579793STom Rini		Defines the size and behavior of the NAND that SPL uses
27717d4b7955SScott Wood		to read U-Boot
277295579793STom Rini
277395579793STom Rini		CONFIG_SYS_NAND_U_BOOT_OFFS
27747d4b7955SScott Wood		Location in NAND to read U-Boot from
27757d4b7955SScott Wood
27767d4b7955SScott Wood		CONFIG_SYS_NAND_U_BOOT_DST
27777d4b7955SScott Wood		Location in memory to load U-Boot to
27787d4b7955SScott Wood
27797d4b7955SScott Wood		CONFIG_SYS_NAND_U_BOOT_SIZE
27807d4b7955SScott Wood		Size of image to load
278195579793STom Rini
278295579793STom Rini		CONFIG_SYS_NAND_U_BOOT_START
27837d4b7955SScott Wood		Entry point in loaded image to jump to
278495579793STom Rini
278595579793STom Rini		CONFIG_SYS_NAND_HW_ECC_OOBFIRST
278695579793STom Rini		Define this if you need to first read the OOB and then the
278795579793STom Rini		data. This is used for example on davinci plattforms.
278895579793STom Rini
278995579793STom Rini		CONFIG_SPL_OMAP3_ID_NAND
279095579793STom Rini		Support for an OMAP3-specific set of functions to return the
279195579793STom Rini		ID and MFR of the first attached NAND chip, if present.
279295579793STom Rini
27936a11cf48SDaniel Schwierzeck		CONFIG_SPL_SERIAL_SUPPORT
27946a11cf48SDaniel Schwierzeck		Support for drivers/serial/libserial.o in SPL binary
27956a11cf48SDaniel Schwierzeck
27966a11cf48SDaniel Schwierzeck		CONFIG_SPL_SPI_FLASH_SUPPORT
27976a11cf48SDaniel Schwierzeck		Support for drivers/mtd/spi/libspi_flash.o in SPL binary
27986a11cf48SDaniel Schwierzeck
27996a11cf48SDaniel Schwierzeck		CONFIG_SPL_SPI_SUPPORT
28006a11cf48SDaniel Schwierzeck		Support for drivers/spi/libspi.o in SPL binary
28016a11cf48SDaniel Schwierzeck
2802c57b953dSPavel Machek		CONFIG_SPL_RAM_DEVICE
2803c57b953dSPavel Machek		Support for running image already present in ram, in SPL binary
2804c57b953dSPavel Machek
28056a11cf48SDaniel Schwierzeck		CONFIG_SPL_LIBGENERIC_SUPPORT
28066a11cf48SDaniel Schwierzeck		Support for lib/libgeneric.o in SPL binary
28071372cce2SMarian Balakowicz
2808ca2fca22SScott Wood		CONFIG_SPL_TARGET
2809ca2fca22SScott Wood		Final target image containing SPL and payload.  Some SPLs
2810ca2fca22SScott Wood		use an arch-specific makefile fragment instead, for
2811ca2fca22SScott Wood		example if more than one image needs to be produced.
2812ca2fca22SScott Wood
2813c609719bSwdenkModem Support:
2814c609719bSwdenk--------------
2815c609719bSwdenk
2816566e5cf4SWolfgang Denk[so far only for SMDK2400 boards]
2817c609719bSwdenk
281811ccc33fSMarcel Ziswiler- Modem support enable:
2819c609719bSwdenk		CONFIG_MODEM_SUPPORT
2820c609719bSwdenk
2821c609719bSwdenk- RTS/CTS Flow control enable:
2822c609719bSwdenk		CONFIG_HWFLOW
2823c609719bSwdenk
2824c609719bSwdenk- Modem debug support:
2825c609719bSwdenk		CONFIG_MODEM_SUPPORT_DEBUG
2826c609719bSwdenk
2827c609719bSwdenk		Enables debugging stuff (char screen[1024], dbg())
2828c609719bSwdenk		for modem support. Useful only with BDI2000.
2829c609719bSwdenk
2830a8c7c708Swdenk- Interrupt support (PPC):
2831a8c7c708Swdenk
2832a8c7c708Swdenk		There are common interrupt_init() and timer_interrupt()
2833a8c7c708Swdenk		for all PPC archs. interrupt_init() calls interrupt_init_cpu()
283411ccc33fSMarcel Ziswiler		for CPU specific initialization. interrupt_init_cpu()
2835a8c7c708Swdenk		should set decrementer_count to appropriate value. If
283611ccc33fSMarcel Ziswiler		CPU resets decrementer automatically after interrupt
2837a8c7c708Swdenk		(ppc4xx) it should set decrementer_count to zero.
283811ccc33fSMarcel Ziswiler		timer_interrupt() calls timer_interrupt_cpu() for CPU
2839a8c7c708Swdenk		specific handling. If board has watchdog / status_led
2840a8c7c708Swdenk		/ other_activity_monitor it works automatically from
2841a8c7c708Swdenk		general timer_interrupt().
2842a8c7c708Swdenk
2843c609719bSwdenk- General:
2844c609719bSwdenk
2845c609719bSwdenk		In the target system modem support is enabled when a
2846c609719bSwdenk		specific key (key combination) is pressed during
2847c609719bSwdenk		power-on. Otherwise U-Boot will boot normally
284811ccc33fSMarcel Ziswiler		(autoboot). The key_pressed() function is called from
2849c609719bSwdenk		board_init(). Currently key_pressed() is a dummy
2850c609719bSwdenk		function, returning 1 and thus enabling modem
2851c609719bSwdenk		initialization.
2852c609719bSwdenk
2853c609719bSwdenk		If there are no modem init strings in the
2854c609719bSwdenk		environment, U-Boot proceed to autoboot; the
2855c609719bSwdenk		previous output (banner, info printfs) will be
285611ccc33fSMarcel Ziswiler		suppressed, though.
2857c609719bSwdenk
2858c609719bSwdenk		See also: doc/README.Modem
2859c609719bSwdenk
28609660e442SHelmut RaigerBoard initialization settings:
28619660e442SHelmut Raiger------------------------------
28629660e442SHelmut Raiger
28639660e442SHelmut RaigerDuring Initialization u-boot calls a number of board specific functions
28649660e442SHelmut Raigerto allow the preparation of board specific prerequisites, e.g. pin setup
28659660e442SHelmut Raigerbefore drivers are initialized. To enable these callbacks the
28669660e442SHelmut Raigerfollowing configuration macros have to be defined. Currently this is
28679660e442SHelmut Raigerarchitecture specific, so please check arch/your_architecture/lib/board.c
28689660e442SHelmut Raigertypically in board_init_f() and board_init_r().
28699660e442SHelmut Raiger
28709660e442SHelmut Raiger- CONFIG_BOARD_EARLY_INIT_F: Call board_early_init_f()
28719660e442SHelmut Raiger- CONFIG_BOARD_EARLY_INIT_R: Call board_early_init_r()
28729660e442SHelmut Raiger- CONFIG_BOARD_LATE_INIT: Call board_late_init()
28739660e442SHelmut Raiger- CONFIG_BOARD_POSTCLK_INIT: Call board_postclk_init()
2874c609719bSwdenk
2875c609719bSwdenkConfiguration Settings:
2876c609719bSwdenk-----------------------
2877c609719bSwdenk
28786d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_LONGHELP: Defined when you want long help messages included;
2879c609719bSwdenk		undefine this when you're short of memory.
2880c609719bSwdenk
28812fb2604dSPeter Tyser- CONFIG_SYS_HELP_CMD_WIDTH: Defined when you want to override the default
28822fb2604dSPeter Tyser		width of the commands listed in the 'help' command output.
28832fb2604dSPeter Tyser
28846d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PROMPT:	This is what U-Boot prints on the console to
2885c609719bSwdenk		prompt for user input.
2886c609719bSwdenk
28876d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CBSIZE:	Buffer size for input from the Console
2888c609719bSwdenk
28896d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PBSIZE:	Buffer size for Console output
2890c609719bSwdenk
28916d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAXARGS:	max. Number of arguments accepted for monitor commands
2892c609719bSwdenk
28936d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BARGSIZE: Buffer size for Boot Arguments which are passed to
2894c609719bSwdenk		the application (usually a Linux kernel) when it is
2895c609719bSwdenk		booted
2896c609719bSwdenk
28976d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BAUDRATE_TABLE:
2898c609719bSwdenk		List of legal baudrate settings for this board.
2899c609719bSwdenk
29006d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_INFO_QUIET
2901c609719bSwdenk		Suppress display of console information at boot.
2902c609719bSwdenk
29036d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_IS_IN_ENV
2904c609719bSwdenk		If the board specific function
2905c609719bSwdenk			extern int overwrite_console (void);
2906c609719bSwdenk		returns 1, the stdin, stderr and stdout are switched to the
2907c609719bSwdenk		serial port, else the settings in the environment are used.
2908c609719bSwdenk
29096d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
2910c609719bSwdenk		Enable the call to overwrite_console().
2911c609719bSwdenk
29126d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_ENV_OVERWRITE
2913c609719bSwdenk		Enable overwrite of previous console environment settings.
2914c609719bSwdenk
29156d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEMTEST_START, CONFIG_SYS_MEMTEST_END:
2916c609719bSwdenk		Begin and End addresses of the area used by the
2917c609719bSwdenk		simple memory test.
2918c609719bSwdenk
29196d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_ALT_MEMTEST:
2920c609719bSwdenk		Enable an alternate, more extensive memory test.
2921c609719bSwdenk
29226d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEMTEST_SCRATCH:
29235f535fe1Swdenk		Scratch address used by the alternate memory test
29245f535fe1Swdenk		You only need to set this if address zero isn't writeable
29255f535fe1Swdenk
29266d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEM_TOP_HIDE (PPC only):
29276d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		If CONFIG_SYS_MEM_TOP_HIDE is defined in the board config header,
292814f73ca6SStefan Roese		this specified memory area will get subtracted from the top
292911ccc33fSMarcel Ziswiler		(end) of RAM and won't get "touched" at all by U-Boot. By
293014f73ca6SStefan Roese		fixing up gd->ram_size the Linux kernel should gets passed
293114f73ca6SStefan Roese		the now "corrected" memory size and won't touch it either.
293214f73ca6SStefan Roese		This should work for arch/ppc and arch/powerpc. Only Linux
29335e12e75dSStefan Roese		board ports in arch/powerpc with bootwrapper support that
293414f73ca6SStefan Roese		recalculate the memory size from the SDRAM controller setup
29355e12e75dSStefan Roese		will have to get fixed in Linux additionally.
293614f73ca6SStefan Roese
293714f73ca6SStefan Roese		This option can be used as a workaround for the 440EPx/GRx
293814f73ca6SStefan Roese		CHIP 11 errata where the last 256 bytes in SDRAM shouldn't
293914f73ca6SStefan Roese		be touched.
294014f73ca6SStefan Roese
294114f73ca6SStefan Roese		WARNING: Please make sure that this value is a multiple of
294214f73ca6SStefan Roese		the Linux page size (normally 4k). If this is not the case,
294314f73ca6SStefan Roese		then the end address of the Linux memory will be located at a
294414f73ca6SStefan Roese		non page size aligned address and this could cause major
294514f73ca6SStefan Roese		problems.
294614f73ca6SStefan Roese
29476d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_TFTP_LOADADDR:
2948c609719bSwdenk		Default load address for network file downloads
2949c609719bSwdenk
29506d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_LOADS_BAUD_CHANGE:
2951c609719bSwdenk		Enable temporary baudrate change while serial download
2952c609719bSwdenk
29536d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SDRAM_BASE:
2954c609719bSwdenk		Physical start address of SDRAM. _Must_ be 0 here.
2955c609719bSwdenk
29566d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MBIO_BASE:
2957c609719bSwdenk		Physical start address of Motherboard I/O (if using a
2958c609719bSwdenk		Cogent motherboard)
2959c609719bSwdenk
29606d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_BASE:
2961c609719bSwdenk		Physical start address of Flash memory.
2962c609719bSwdenk
29636d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MONITOR_BASE:
2964c609719bSwdenk		Physical start address of boot monitor code (set by
2965c609719bSwdenk		make config files to be same as the text base address
296614d0a02aSWolfgang Denk		(CONFIG_SYS_TEXT_BASE) used when linking) - same as
29676d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FLASH_BASE when booting from flash.
2968c609719bSwdenk
29696d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MONITOR_LEN:
29703b57fe0aSwdenk		Size of memory reserved for monitor code, used to
29713b57fe0aSwdenk		determine _at_compile_time_ (!) if the environment is
29723b57fe0aSwdenk		embedded within the U-Boot image, or in a separate
29733b57fe0aSwdenk		flash sector.
2974c609719bSwdenk
29756d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MALLOC_LEN:
2976c609719bSwdenk		Size of DRAM reserved for malloc() use.
2977c609719bSwdenk
29786d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BOOTM_LEN:
297915940c9aSStefan Roese		Normally compressed uImages are limited to an
298015940c9aSStefan Roese		uncompressed size of 8 MBytes. If this is not enough,
29816d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		you can define CONFIG_SYS_BOOTM_LEN in your board config file
298215940c9aSStefan Roese		to adjust this setting to your needs.
2983c609719bSwdenk
29846d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BOOTMAPSZ:
2985c609719bSwdenk		Maximum size of memory mapped by the startup code of
2986c609719bSwdenk		the Linux kernel; all data that must be processed by
29877d721e34SBartlomiej Sieka		the Linux kernel (bd_info, boot arguments, FDT blob if
29887d721e34SBartlomiej Sieka		used) must be put below this limit, unless "bootm_low"
29897d721e34SBartlomiej Sieka		enviroment variable is defined and non-zero. In such case
29907d721e34SBartlomiej Sieka		all data for the Linux kernel must be between "bootm_low"
2991c3624e6eSGrant Likely		and "bootm_low" + CONFIG_SYS_BOOTMAPSZ.	 The environment
2992c3624e6eSGrant Likely		variable "bootm_mapsize" will override the value of
2993c3624e6eSGrant Likely		CONFIG_SYS_BOOTMAPSZ.  If CONFIG_SYS_BOOTMAPSZ is undefined,
2994c3624e6eSGrant Likely		then the value in "bootm_size" will be used instead.
2995c609719bSwdenk
2996fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_RAMDISK_HIGH:
2997fca43cc8SJohn Rigby		Enable initrd_high functionality.  If defined then the
2998fca43cc8SJohn Rigby		initrd_high feature is enabled and the bootm ramdisk subcommand
2999fca43cc8SJohn Rigby		is enabled.
3000fca43cc8SJohn Rigby
3001fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_GET_CMDLINE:
3002fca43cc8SJohn Rigby		Enables allocating and saving kernel cmdline in space between
3003fca43cc8SJohn Rigby		"bootm_low" and "bootm_low" + BOOTMAPSZ.
3004fca43cc8SJohn Rigby
3005fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_GET_KBD:
3006fca43cc8SJohn Rigby		Enables allocating and saving a kernel copy of the bd_info in
3007fca43cc8SJohn Rigby		space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
3008fca43cc8SJohn Rigby
30096d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAX_FLASH_BANKS:
3010c609719bSwdenk		Max number of Flash memory banks
3011c609719bSwdenk
30126d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAX_FLASH_SECT:
3013c609719bSwdenk		Max number of sectors on a Flash chip
3014c609719bSwdenk
30156d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_ERASE_TOUT:
3016c609719bSwdenk		Timeout for Flash erase operations (in ms)
3017c609719bSwdenk
30186d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_WRITE_TOUT:
3019c609719bSwdenk		Timeout for Flash write operations (in ms)
3020c609719bSwdenk
30216d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_LOCK_TOUT
30228564acf9Swdenk		Timeout for Flash set sector lock bit operation (in ms)
30238564acf9Swdenk
30246d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_UNLOCK_TOUT
30258564acf9Swdenk		Timeout for Flash clear lock bits operation (in ms)
30268564acf9Swdenk
30276d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_PROTECTION
30288564acf9Swdenk		If defined, hardware flash sectors protection is used
30298564acf9Swdenk		instead of U-Boot software protection.
30308564acf9Swdenk
30316d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DIRECT_FLASH_TFTP:
3032c609719bSwdenk
3033c609719bSwdenk		Enable TFTP transfers directly to flash memory;
3034c609719bSwdenk		without this option such a download has to be
3035c609719bSwdenk		performed in two steps: (1) download to RAM, and (2)
3036c609719bSwdenk		copy from RAM to flash.
3037c609719bSwdenk
3038c609719bSwdenk		The two-step approach is usually more reliable, since
3039c609719bSwdenk		you can check if the download worked before you erase
304011ccc33fSMarcel Ziswiler		the flash, but in some situations (when system RAM is
304111ccc33fSMarcel Ziswiler		too limited to allow for a temporary copy of the
3042c609719bSwdenk		downloaded image) this option may be very useful.
3043c609719bSwdenk
30446d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_CFI:
3045c609719bSwdenk		Define if the flash driver uses extra elements in the
30465653fc33Swdenk		common flash structure for storing flash geometry.
30475653fc33Swdenk
304800b1883aSJean-Christophe PLAGNIOL-VILLARD- CONFIG_FLASH_CFI_DRIVER
30495653fc33Swdenk		This option also enables the building of the cfi_flash driver
30505653fc33Swdenk		in the drivers directory
305153cf9435Sstroese
305291809ed5SPiotr Ziecik- CONFIG_FLASH_CFI_MTD
305391809ed5SPiotr Ziecik		This option enables the building of the cfi_mtd driver
305491809ed5SPiotr Ziecik		in the drivers directory. The driver exports CFI flash
305591809ed5SPiotr Ziecik		to the MTD layer.
305691809ed5SPiotr Ziecik
30576d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_USE_BUFFER_WRITE
305896ef831fSGuennadi Liakhovetski		Use buffered writes to flash.
305996ef831fSGuennadi Liakhovetski
306096ef831fSGuennadi Liakhovetski- CONFIG_FLASH_SPANSION_S29WS_N
306196ef831fSGuennadi Liakhovetski		s29ws-n MirrorBit flash has non-standard addresses for buffered
306296ef831fSGuennadi Liakhovetski		write commands.
306396ef831fSGuennadi Liakhovetski
30646d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_QUIET_TEST
30655568e613SStefan Roese		If this option is defined, the common CFI flash doesn't
30665568e613SStefan Roese		print it's warning upon not recognized FLASH banks. This
30675568e613SStefan Roese		is useful, if some of the configured banks are only
30685568e613SStefan Roese		optionally available.
30695568e613SStefan Roese
30709a042e9cSJerry Van Baren- CONFIG_FLASH_SHOW_PROGRESS
30719a042e9cSJerry Van Baren		If defined (must be an integer), print out countdown
30729a042e9cSJerry Van Baren		digits and dots.  Recommended value: 45 (9..1) for 80
30739a042e9cSJerry Van Baren		column displays, 15 (3..1) for 40 column displays.
30749a042e9cSJerry Van Baren
30756d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_RX_ETH_BUFFER:
307611ccc33fSMarcel Ziswiler		Defines the number of Ethernet receive buffers. On some
307711ccc33fSMarcel Ziswiler		Ethernet controllers it is recommended to set this value
307853cf9435Sstroese		to 8 or even higher (EEPRO100 or 405 EMAC), since all
307953cf9435Sstroese		buffers can be full shortly after enabling the interface
308011ccc33fSMarcel Ziswiler		on high Ethernet traffic.
308153cf9435Sstroese		Defaults to 4 if not defined.
3082c609719bSwdenk
3083ea882bafSWolfgang Denk- CONFIG_ENV_MAX_ENTRIES
3084ea882bafSWolfgang Denk
3085ea882bafSWolfgang Denk	Maximum number of entries in the hash table that is used
3086ea882bafSWolfgang Denk	internally to store the environment settings. The default
3087ea882bafSWolfgang Denk	setting is supposed to be generous and should work in most
3088ea882bafSWolfgang Denk	cases. This setting can be used to tune behaviour; see
3089ea882bafSWolfgang Denk	lib/hashtable.c for details.
3090ea882bafSWolfgang Denk
3091c609719bSwdenkThe following definitions that deal with the placement and management
3092c609719bSwdenkof environment data (variable area); in general, we support the
3093c609719bSwdenkfollowing configurations:
3094c609719bSwdenk
3095c3eb3fe4SMike Frysinger- CONFIG_BUILD_ENVCRC:
3096c3eb3fe4SMike Frysinger
3097c3eb3fe4SMike Frysinger	Builds up envcrc with the target environment so that external utils
3098c3eb3fe4SMike Frysinger	may easily extract it and embed it in final U-Boot images.
3099c3eb3fe4SMike Frysinger
31005a1aceb0SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_FLASH:
3101c609719bSwdenk
3102c609719bSwdenk	Define this if the environment is in flash memory.
3103c609719bSwdenk
3104c609719bSwdenk	a) The environment occupies one whole flash sector, which is
3105c609719bSwdenk	   "embedded" in the text segment with the U-Boot code. This
3106c609719bSwdenk	   happens usually with "bottom boot sector" or "top boot
3107c609719bSwdenk	   sector" type flash chips, which have several smaller
3108c609719bSwdenk	   sectors at the start or the end. For instance, such a
3109c609719bSwdenk	   layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In
3110c609719bSwdenk	   such a case you would place the environment in one of the
3111c609719bSwdenk	   4 kB sectors - with U-Boot code before and after it. With
3112c609719bSwdenk	   "top boot sector" type flash chips, you would put the
3113c609719bSwdenk	   environment in one of the last sectors, leaving a gap
3114c609719bSwdenk	   between U-Boot and the environment.
3115c609719bSwdenk
31160e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
3117c609719bSwdenk
3118c609719bSwdenk	   Offset of environment data (variable area) to the
3119c609719bSwdenk	   beginning of flash memory; for instance, with bottom boot
3120c609719bSwdenk	   type flash chips the second sector can be used: the offset
3121c609719bSwdenk	   for this sector is given here.
3122c609719bSwdenk
31236d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	   CONFIG_ENV_OFFSET is used relative to CONFIG_SYS_FLASH_BASE.
3124c609719bSwdenk
31250e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
3126c609719bSwdenk
3127c609719bSwdenk	   This is just another way to specify the start address of
3128c609719bSwdenk	   the flash sector containing the environment (instead of
31290e8d1586SJean-Christophe PLAGNIOL-VILLARD	   CONFIG_ENV_OFFSET).
3130c609719bSwdenk
31310e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SECT_SIZE:
3132c609719bSwdenk
3133c609719bSwdenk	   Size of the sector containing the environment.
3134c609719bSwdenk
3135c609719bSwdenk
3136c609719bSwdenk	b) Sometimes flash chips have few, equal sized, BIG sectors.
3137c609719bSwdenk	   In such a case you don't want to spend a whole sector for
3138c609719bSwdenk	   the environment.
3139c609719bSwdenk
31400e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
3141c609719bSwdenk
31425a1aceb0SJean-Christophe PLAGNIOL-VILLARD	   If you use this in combination with CONFIG_ENV_IS_IN_FLASH
31430e8d1586SJean-Christophe PLAGNIOL-VILLARD	   and CONFIG_ENV_SECT_SIZE, you can specify to use only a part
3144c609719bSwdenk	   of this flash sector for the environment. This saves
3145c609719bSwdenk	   memory for the RAM copy of the environment.
3146c609719bSwdenk
3147c609719bSwdenk	   It may also save flash memory if you decide to use this
3148c609719bSwdenk	   when your environment is "embedded" within U-Boot code,
3149c609719bSwdenk	   since then the remainder of the flash sector could be used
3150c609719bSwdenk	   for U-Boot code. It should be pointed out that this is
3151c609719bSwdenk	   STRONGLY DISCOURAGED from a robustness point of view:
3152c609719bSwdenk	   updating the environment in flash makes it always
3153c609719bSwdenk	   necessary to erase the WHOLE sector. If something goes
3154c609719bSwdenk	   wrong before the contents has been restored from a copy in
3155c609719bSwdenk	   RAM, your target system will be dead.
3156c609719bSwdenk
31570e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR_REDUND
31580e8d1586SJean-Christophe PLAGNIOL-VILLARD	  CONFIG_ENV_SIZE_REDUND
3159c609719bSwdenk
3160c609719bSwdenk	   These settings describe a second storage area used to hold
316111ccc33fSMarcel Ziswiler	   a redundant copy of the environment data, so that there is
31623e38691eSwdenk	   a valid backup copy in case there is a power failure during
3163c609719bSwdenk	   a "saveenv" operation.
3164c609719bSwdenk
3165c609719bSwdenkBE CAREFUL! Any changes to the flash layout, and some changes to the
3166c609719bSwdenksource code will make it necessary to adapt <board>/u-boot.lds*
3167c609719bSwdenkaccordingly!
3168c609719bSwdenk
3169c609719bSwdenk
31709314cee6SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_NVRAM:
3171c609719bSwdenk
3172c609719bSwdenk	Define this if you have some non-volatile memory device
3173c609719bSwdenk	(NVRAM, battery buffered SRAM) which you want to use for the
3174c609719bSwdenk	environment.
3175c609719bSwdenk
31760e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
31770e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
3178c609719bSwdenk
317911ccc33fSMarcel Ziswiler	  These two #defines are used to determine the memory area you
3180c609719bSwdenk	  want to use for environment. It is assumed that this memory
3181c609719bSwdenk	  can just be read and written to, without any special
3182c609719bSwdenk	  provision.
3183c609719bSwdenk
3184c609719bSwdenkBE CAREFUL! The first access to the environment happens quite early
3185c609719bSwdenkin U-Boot initalization (when we try to get the setting of for the
318611ccc33fSMarcel Ziswilerconsole baudrate). You *MUST* have mapped your NVRAM area then, or
3187c609719bSwdenkU-Boot will hang.
3188c609719bSwdenk
3189c609719bSwdenkPlease note that even with NVRAM we still use a copy of the
3190c609719bSwdenkenvironment in RAM: we could work on NVRAM directly, but we want to
3191c609719bSwdenkkeep settings there always unmodified except somebody uses "saveenv"
3192c609719bSwdenkto save the current settings.
3193c609719bSwdenk
3194c609719bSwdenk
3195bb1f8b4fSJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_EEPROM:
3196c609719bSwdenk
3197c609719bSwdenk	Use this if you have an EEPROM or similar serial access
3198c609719bSwdenk	device and a driver for it.
3199c609719bSwdenk
32000e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
32010e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
3202c609719bSwdenk
3203c609719bSwdenk	  These two #defines specify the offset and size of the
3204c609719bSwdenk	  environment area within the total memory of your EEPROM.
3205c609719bSwdenk
32066d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR:
3207c609719bSwdenk	  If defined, specified the chip address of the EEPROM device.
3208c609719bSwdenk	  The default address is zero.
3209c609719bSwdenk
32106d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_PAGE_WRITE_BITS:
3211c609719bSwdenk	  If defined, the number of bits used to address bytes in a
3212c609719bSwdenk	  single page in the EEPROM device.  A 64 byte page, for example
3213c609719bSwdenk	  would require six bits.
3214c609719bSwdenk
32156d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS:
3216c609719bSwdenk	  If defined, the number of milliseconds to delay between
3217c609719bSwdenk	  page writes.	The default is zero milliseconds.
3218c609719bSwdenk
32196d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR_LEN:
3220c609719bSwdenk	  The length in bytes of the EEPROM memory array address.  Note
3221c609719bSwdenk	  that this is NOT the chip address length!
3222c609719bSwdenk
32236d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW:
32245cf91d6bSwdenk	  EEPROM chips that implement "address overflow" are ones
32255cf91d6bSwdenk	  like Catalyst 24WC04/08/16 which has 9/10/11 bits of
32265cf91d6bSwdenk	  address and the extra bits end up in the "chip address" bit
32275cf91d6bSwdenk	  slots. This makes a 24WC08 (1Kbyte) chip look like four 256
32285cf91d6bSwdenk	  byte chips.
32295cf91d6bSwdenk
32305cf91d6bSwdenk	  Note that we consider the length of the address field to
32315cf91d6bSwdenk	  still be one byte because the extra address bits are hidden
32325cf91d6bSwdenk	  in the chip address.
32335cf91d6bSwdenk
32346d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_SIZE:
3235c609719bSwdenk	  The size in bytes of the EEPROM device.
3236c609719bSwdenk
3237548738b4SHeiko Schocher	- CONFIG_ENV_EEPROM_IS_ON_I2C
3238548738b4SHeiko Schocher	  define this, if you have I2C and SPI activated, and your
3239548738b4SHeiko Schocher	  EEPROM, which holds the environment, is on the I2C bus.
3240548738b4SHeiko Schocher
3241548738b4SHeiko Schocher	- CONFIG_I2C_ENV_EEPROM_BUS
3242548738b4SHeiko Schocher	  if you have an Environment on an EEPROM reached over
3243548738b4SHeiko Schocher	  I2C muxes, you can define here, how to reach this
3244548738b4SHeiko Schocher	  EEPROM. For example:
3245548738b4SHeiko Schocher
3246548738b4SHeiko Schocher	  #define CONFIG_I2C_ENV_EEPROM_BUS	  "pca9547:70:d\0"
3247548738b4SHeiko Schocher
3248548738b4SHeiko Schocher	  EEPROM which holds the environment, is reached over
3249548738b4SHeiko Schocher	  a pca9547 i2c mux with address 0x70, channel 3.
3250c609719bSwdenk
3251057c849cSJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_DATAFLASH:
32525779d8d9Swdenk
32535779d8d9Swdenk	Define this if you have a DataFlash memory device which you
32545779d8d9Swdenk	want to use for the environment.
32555779d8d9Swdenk
32560e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
32570e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
32580e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
32595779d8d9Swdenk
32605779d8d9Swdenk	  These three #defines specify the offset and size of the
32615779d8d9Swdenk	  environment area within the total memory of your DataFlash placed
32625779d8d9Swdenk	  at the specified address.
32635779d8d9Swdenk
32640a85a9e7SLiu Gang- CONFIG_ENV_IS_IN_REMOTE:
32650a85a9e7SLiu Gang
32660a85a9e7SLiu Gang	Define this if you have a remote memory space which you
32670a85a9e7SLiu Gang	want to use for the local device's environment.
32680a85a9e7SLiu Gang
32690a85a9e7SLiu Gang	- CONFIG_ENV_ADDR:
32700a85a9e7SLiu Gang	- CONFIG_ENV_SIZE:
32710a85a9e7SLiu Gang
32720a85a9e7SLiu Gang	  These two #defines specify the address and size of the
32730a85a9e7SLiu Gang	  environment area within the remote memory space. The
32740a85a9e7SLiu Gang	  local device can get the environment from remote memory
3275fc54c7faSLiu Gang	  space by SRIO or PCIE links.
32760a85a9e7SLiu Gang
32770a85a9e7SLiu GangBE CAREFUL! For some special cases, the local device can not use
32780a85a9e7SLiu Gang"saveenv" command. For example, the local device will get the
3279fc54c7faSLiu Gangenvironment stored in a remote NOR flash by SRIO or PCIE link,
3280fc54c7faSLiu Gangbut it can not erase, write this NOR flash by SRIO or PCIE interface.
32810a85a9e7SLiu Gang
328251bfee19SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_NAND:
328313a5695bSwdenk
328413a5695bSwdenk	Define this if you have a NAND device which you want to use
328513a5695bSwdenk	for the environment.
328613a5695bSwdenk
32870e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
32880e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
328913a5695bSwdenk
329013a5695bSwdenk	  These two #defines specify the offset and size of the environment
3291fdd813deSScott Wood	  area within the first NAND device.  CONFIG_ENV_OFFSET must be
3292fdd813deSScott Wood	  aligned to an erase block boundary.
32935779d8d9Swdenk
3294fdd813deSScott Wood	- CONFIG_ENV_OFFSET_REDUND (optional):
3295e443c944SMarkus Klotzbuecher
32960e8d1586SJean-Christophe PLAGNIOL-VILLARD	  This setting describes a second storage area of CONFIG_ENV_SIZE
3297fdd813deSScott Wood	  size used to hold a redundant copy of the environment data, so
3298fdd813deSScott Wood	  that there is a valid backup copy in case there is a power failure
3299fdd813deSScott Wood	  during a "saveenv" operation.	 CONFIG_ENV_OFFSET_RENDUND must be
3300fdd813deSScott Wood	  aligned to an erase block boundary.
3301e443c944SMarkus Klotzbuecher
3302fdd813deSScott Wood	- CONFIG_ENV_RANGE (optional):
3303fdd813deSScott Wood
3304fdd813deSScott Wood	  Specifies the length of the region in which the environment
3305fdd813deSScott Wood	  can be written.  This should be a multiple of the NAND device's
3306fdd813deSScott Wood	  block size.  Specifying a range with more erase blocks than
3307fdd813deSScott Wood	  are needed to hold CONFIG_ENV_SIZE allows bad blocks within
3308fdd813deSScott Wood	  the range to be avoided.
3309fdd813deSScott Wood
3310fdd813deSScott Wood	- CONFIG_ENV_OFFSET_OOB (optional):
3311fdd813deSScott Wood
3312fdd813deSScott Wood	  Enables support for dynamically retrieving the offset of the
3313fdd813deSScott Wood	  environment from block zero's out-of-band data.  The
3314fdd813deSScott Wood	  "nand env.oob" command can be used to record this offset.
3315fdd813deSScott Wood	  Currently, CONFIG_ENV_OFFSET_REDUND is not supported when
3316fdd813deSScott Wood	  using CONFIG_ENV_OFFSET_OOB.
3317e443c944SMarkus Klotzbuecher
3318b74ab737SGuennadi Liakhovetski- CONFIG_NAND_ENV_DST
3319b74ab737SGuennadi Liakhovetski
3320b74ab737SGuennadi Liakhovetski	Defines address in RAM to which the nand_spl code should copy the
3321b74ab737SGuennadi Liakhovetski	environment. If redundant environment is used, it will be copied to
3322b74ab737SGuennadi Liakhovetski	CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE.
3323b74ab737SGuennadi Liakhovetski
33246d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPI_INIT_OFFSET
3325c609719bSwdenk
3326c609719bSwdenk	Defines offset to the initial SPI buffer area in DPRAM. The
3327c609719bSwdenk	area is used at an early stage (ROM part) if the environment
3328c609719bSwdenk	is configured to reside in the SPI EEPROM: We need a 520 byte
3329c609719bSwdenk	scratch DPRAM area. It is used between the two initialization
3330c609719bSwdenk	calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems
3331c609719bSwdenk	to be a good choice since it makes it far enough from the
3332c609719bSwdenk	start of the data area as well as from the stack pointer.
3333c609719bSwdenk
3334e881cb56SBruce AdlerPlease note that the environment is read-only until the monitor
3335c609719bSwdenkhas been relocated to RAM and a RAM copy of the environment has been
3336cdb74977SWolfgang Denkcreated; also, when using EEPROM you will have to use getenv_f()
3337c609719bSwdenkuntil then to read environment variables.
3338c609719bSwdenk
333985ec0bccSwdenkThe environment is protected by a CRC32 checksum. Before the monitor
334085ec0bccSwdenkis relocated into RAM, as a result of a bad CRC you will be working
334185ec0bccSwdenkwith the compiled-in default environment - *silently*!!! [This is
334285ec0bccSwdenknecessary, because the first environment variable we need is the
334385ec0bccSwdenk"baudrate" setting for the console - if we have a bad CRC, we don't
334485ec0bccSwdenkhave any device yet where we could complain.]
3345c609719bSwdenk
3346c609719bSwdenkNote: once the monitor has been relocated, then it will complain if
3347c609719bSwdenkthe default environment is used; a new CRC is computed as soon as you
334885ec0bccSwdenkuse the "saveenv" command to store a valid environment.
3349c609719bSwdenk
33506d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FAULT_ECHO_LINK_DOWN:
3351fc3e2165Swdenk		Echo the inverted Ethernet link state to the fault LED.
3352fc3e2165Swdenk
33536d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		Note: If this option is active, then CONFIG_SYS_FAULT_MII_ADDR
3354fc3e2165Swdenk		      also needs to be defined.
3355fc3e2165Swdenk
33566d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FAULT_MII_ADDR:
3357fc3e2165Swdenk		MII address of the PHY to check for the Ethernet link state.
3358c609719bSwdenk
3359f5675aa5SRon Madrid- CONFIG_NS16550_MIN_FUNCTIONS:
3360f5675aa5SRon Madrid		Define this if you desire to only have use of the NS16550_init
3361f5675aa5SRon Madrid		and NS16550_putc functions for the serial driver located at
3362f5675aa5SRon Madrid		drivers/serial/ns16550.c.  This option is useful for saving
3363f5675aa5SRon Madrid		space for already greatly restricted images, including but not
3364f5675aa5SRon Madrid		limited to NAND_SPL configurations.
3365f5675aa5SRon Madrid
3366c609719bSwdenkLow Level (hardware related) configuration options:
3367dc7c9a1aSwdenk---------------------------------------------------
3368c609719bSwdenk
33696d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CACHELINE_SIZE:
3370c609719bSwdenk		Cache Line Size of the CPU.
3371c609719bSwdenk
33726d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DEFAULT_IMMR:
3373c609719bSwdenk		Default address of the IMMR after system reset.
33742535d602Swdenk
33752535d602Swdenk		Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU,
33762535d602Swdenk		and RPXsuper) to be able to adjust the position of
33772535d602Swdenk		the IMMR register after a reset.
3378c609719bSwdenk
3379e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_DEFAULT:
3380e46fedfeSTimur Tabi		Default (power-on reset) physical address of CCSR on Freescale
3381e46fedfeSTimur Tabi		PowerPC SOCs.
3382e46fedfeSTimur Tabi
3383e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR:
3384e46fedfeSTimur Tabi		Virtual address of CCSR.  On a 32-bit build, this is typically
3385e46fedfeSTimur Tabi		the same value as CONFIG_SYS_CCSRBAR_DEFAULT.
3386e46fedfeSTimur Tabi
3387e46fedfeSTimur Tabi		CONFIG_SYS_DEFAULT_IMMR must also be set to this value,
3388e46fedfeSTimur Tabi		for cross-platform code that uses that macro instead.
3389e46fedfeSTimur Tabi
3390e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS:
3391e46fedfeSTimur Tabi		Physical address of CCSR.  CCSR can be relocated to a new
3392e46fedfeSTimur Tabi		physical address, if desired.  In this case, this macro should
3393e46fedfeSTimur Tabi		be set to that address.	 Otherwise, it should be set to the
3394e46fedfeSTimur Tabi		same value as CONFIG_SYS_CCSRBAR_DEFAULT.  For example, CCSR
3395e46fedfeSTimur Tabi		is typically relocated on 36-bit builds.  It is recommended
3396e46fedfeSTimur Tabi		that this macro be defined via the _HIGH and _LOW macros:
3397e46fedfeSTimur Tabi
3398e46fedfeSTimur Tabi		#define CONFIG_SYS_CCSRBAR_PHYS ((CONFIG_SYS_CCSRBAR_PHYS_HIGH
3399e46fedfeSTimur Tabi			* 1ull) << 32 | CONFIG_SYS_CCSRBAR_PHYS_LOW)
3400e46fedfeSTimur Tabi
3401e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS_HIGH:
3402e46fedfeSTimur Tabi		Bits 33-36 of CONFIG_SYS_CCSRBAR_PHYS.	This value is typically
3403e46fedfeSTimur Tabi		either 0 (32-bit build) or 0xF (36-bit build).	This macro is
3404e46fedfeSTimur Tabi		used in assembly code, so it must not contain typecasts or
3405e46fedfeSTimur Tabi		integer size suffixes (e.g. "ULL").
3406e46fedfeSTimur Tabi
3407e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS_LOW:
3408e46fedfeSTimur Tabi		Lower 32-bits of CONFIG_SYS_CCSRBAR_PHYS.  This macro is
3409e46fedfeSTimur Tabi		used in assembly code, so it must not contain typecasts or
3410e46fedfeSTimur Tabi		integer size suffixes (e.g. "ULL").
3411e46fedfeSTimur Tabi
3412e46fedfeSTimur Tabi- CONFIG_SYS_CCSR_DO_NOT_RELOCATE:
3413e46fedfeSTimur Tabi		If this macro is defined, then CONFIG_SYS_CCSRBAR_PHYS will be
3414e46fedfeSTimur Tabi		forced to a value that ensures that CCSR is not relocated.
3415e46fedfeSTimur Tabi
34167f6c2cbcSwdenk- Floppy Disk Support:
34176d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FDC_DRIVE_NUMBER
34187f6c2cbcSwdenk
34197f6c2cbcSwdenk		the default drive number (default value 0)
34207f6c2cbcSwdenk
34216d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_ISA_IO_STRIDE
34227f6c2cbcSwdenk
342311ccc33fSMarcel Ziswiler		defines the spacing between FDC chipset registers
34247f6c2cbcSwdenk		(default value 1)
34257f6c2cbcSwdenk
34266d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_ISA_IO_OFFSET
34277f6c2cbcSwdenk
34287f6c2cbcSwdenk		defines the offset of register from address. It
34297f6c2cbcSwdenk		depends on which part of the data bus is connected to
343011ccc33fSMarcel Ziswiler		the FDC chipset. (default value 0)
34317f6c2cbcSwdenk
34326d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		If CONFIG_SYS_ISA_IO_STRIDE CONFIG_SYS_ISA_IO_OFFSET and
34336d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FDC_DRIVE_NUMBER are undefined, they take their
34347f6c2cbcSwdenk		default value.
34357f6c2cbcSwdenk
34366d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		if CONFIG_SYS_FDC_HW_INIT is defined, then the function
34377f6c2cbcSwdenk		fdc_hw_init() is called at the beginning of the FDC
34387f6c2cbcSwdenk		setup. fdc_hw_init() must be provided by the board
34397f6c2cbcSwdenk		source code. It is used to make hardware dependant
34407f6c2cbcSwdenk		initializations.
34417f6c2cbcSwdenk
34420abddf82SMacpaul Lin- CONFIG_IDE_AHB:
34430abddf82SMacpaul Lin		Most IDE controllers were designed to be connected with PCI
34440abddf82SMacpaul Lin		interface. Only few of them were designed for AHB interface.
34450abddf82SMacpaul Lin		When software is doing ATA command and data transfer to
34460abddf82SMacpaul Lin		IDE devices through IDE-AHB controller, some additional
34470abddf82SMacpaul Lin		registers accessing to these kind of IDE-AHB controller
34480abddf82SMacpaul Lin		is requierd.
34490abddf82SMacpaul Lin
34506d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_IMMR:	Physical address of the Internal Memory.
345125d6712aSwdenk		DO NOT CHANGE unless you know exactly what you're
345225d6712aSwdenk		doing! (11-4) [MPC8xx/82xx systems only]
3453c609719bSwdenk
34546d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_INIT_RAM_ADDR:
3455c609719bSwdenk
34567152b1d0Swdenk		Start address of memory area that can be used for
3457c609719bSwdenk		initial data and stack; please note that this must be
3458c609719bSwdenk		writable memory that is working WITHOUT special
3459c609719bSwdenk		initialization, i. e. you CANNOT use normal RAM which
3460c609719bSwdenk		will become available only after programming the
3461c609719bSwdenk		memory controller and running certain initialization
3462c609719bSwdenk		sequences.
3463c609719bSwdenk
3464c609719bSwdenk		U-Boot uses the following memory types:
3465c609719bSwdenk		- MPC8xx and MPC8260: IMMR (internal memory of the CPU)
3466c609719bSwdenk		- MPC824X: data cache
3467c609719bSwdenk		- PPC4xx:  data cache
3468c609719bSwdenk
34696d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_GBL_DATA_OFFSET:
3470c609719bSwdenk
3471c609719bSwdenk		Offset of the initial data structure in the memory
34726d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		area defined by CONFIG_SYS_INIT_RAM_ADDR. Usually
34736d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_GBL_DATA_OFFSET is chosen such that the initial
3474c609719bSwdenk		data is located at the end of the available space
3475553f0982SWolfgang Denk		(sometimes written as (CONFIG_SYS_INIT_RAM_SIZE -
34766d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_INIT_DATA_SIZE), and the initial stack is just
34776d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		below that area (growing from (CONFIG_SYS_INIT_RAM_ADDR +
34786d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_GBL_DATA_OFFSET) downward.
3479c609719bSwdenk
3480c609719bSwdenk	Note:
3481c609719bSwdenk		On the MPC824X (or other systems that use the data
3482c609719bSwdenk		cache for initial memory) the address chosen for
34836d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_INIT_RAM_ADDR is basically arbitrary - it must
3484c609719bSwdenk		point to an otherwise UNUSED address space between
3485c609719bSwdenk		the top of RAM and the start of the PCI space.
3486c609719bSwdenk
34876d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SIUMCR:	SIU Module Configuration (11-6)
3488c609719bSwdenk
34896d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SYPCR:	System Protection Control (11-9)
3490c609719bSwdenk
34916d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_TBSCR:	Time Base Status and Control (11-26)
3492c609719bSwdenk
34936d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PISCR:	Periodic Interrupt Status and Control (11-31)
3494c609719bSwdenk
34956d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PLPRCR:	PLL, Low-Power, and Reset Control Register (15-30)
3496c609719bSwdenk
34976d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SCCR:	System Clock and reset Control Register (15-27)
3498c609719bSwdenk
34996d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_OR_TIMING_SDRAM:
3500c609719bSwdenk		SDRAM timing
3501c609719bSwdenk
35026d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAMR_PTA:
3503c609719bSwdenk		periodic timer for refresh
3504c609719bSwdenk
35056d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DER:	Debug Event Register (37-47)
3506c609719bSwdenk
35076d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CONFIG_SYS_REMAP_OR_AM,
35086d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PRELIM_OR_AM, CONFIG_SYS_OR_TIMING_FLASH, CONFIG_SYS_OR0_REMAP,
35096d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR0_PRELIM, CONFIG_SYS_BR0_PRELIM, CONFIG_SYS_OR1_REMAP, CONFIG_SYS_OR1_PRELIM,
35106d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_BR1_PRELIM:
3511c609719bSwdenk		Memory Controller Definitions: BR0/1 and OR0/1 (FLASH)
3512c609719bSwdenk
3513c609719bSwdenk- SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE,
35146d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR_TIMING_SDRAM, CONFIG_SYS_OR2_PRELIM, CONFIG_SYS_BR2_PRELIM,
35156d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR3_PRELIM, CONFIG_SYS_BR3_PRELIM:
3516c609719bSwdenk		Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM)
3517c609719bSwdenk
35186d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAMR_PTA, CONFIG_SYS_MPTPR_2BK_4K, CONFIG_SYS_MPTPR_1BK_4K, CONFIG_SYS_MPTPR_2BK_8K,
35196d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_MPTPR_1BK_8K, CONFIG_SYS_MAMR_8COL, CONFIG_SYS_MAMR_9COL:
3520c609719bSwdenk		Machine Mode Register and Memory Periodic Timer
3521c609719bSwdenk		Prescaler definitions (SDRAM timing)
3522c609719bSwdenk
35236d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_I2C_UCODE_PATCH, CONFIG_SYS_I2C_DPMEM_OFFSET [0x1FC0]:
3524c609719bSwdenk		enable I2C microcode relocation patch (MPC8xx);
3525c609719bSwdenk		define relocation offset in DPRAM [DSP2]
3526c609719bSwdenk
35276d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SMC_UCODE_PATCH, CONFIG_SYS_SMC_DPMEM_OFFSET [0x1FC0]:
3528b423d055SHeiko Schocher		enable SMC microcode relocation patch (MPC8xx);
3529b423d055SHeiko Schocher		define relocation offset in DPRAM [SMC1]
3530b423d055SHeiko Schocher
35316d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPI_UCODE_PATCH, CONFIG_SYS_SPI_DPMEM_OFFSET [0x1FC0]:
3532c609719bSwdenk		enable SPI microcode relocation patch (MPC8xx);
3533c609719bSwdenk		define relocation offset in DPRAM [SCC4]
3534c609719bSwdenk
35356d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_USE_OSCCLK:
3536c609719bSwdenk		Use OSCM clock mode on MBX8xx board. Be careful,
3537c609719bSwdenk		wrong setting might damage your board. Read
3538c609719bSwdenk		doc/README.MBX before setting this variable!
3539c609719bSwdenk
35406d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only)
3541ea909b76Swdenk		Offset of the bootmode word in DPRAM used by post
3542ea909b76Swdenk		(Power On Self Tests). This definition overrides
3543ea909b76Swdenk		#define'd default value in commproc.h resp.
3544ea909b76Swdenk		cpm_8260.h.
3545ea909b76Swdenk
35466d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PCI_SLV_MEM_LOCAL, CONFIG_SYS_PCI_SLV_MEM_BUS, CONFIG_SYS_PICMR0_MASK_ATTRIB,
35476d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR0_LOCAL, CONFIG_SYS_PCIMSK0_MASK, CONFIG_SYS_PCI_MSTR1_LOCAL,
35486d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCIMSK1_MASK, CONFIG_SYS_PCI_MSTR_MEM_LOCAL, CONFIG_SYS_PCI_MSTR_MEM_BUS,
35496d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_CPU_PCI_MEM_START, CONFIG_SYS_PCI_MSTR_MEM_SIZE, CONFIG_SYS_POCMR0_MASK_ATTRIB,
35506d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_MEMIO_LOCAL, CONFIG_SYS_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START,
35516d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_MEMIO_SIZE, CONFIG_SYS_POCMR1_MASK_ATTRIB, CONFIG_SYS_PCI_MSTR_IO_LOCAL,
35526d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_IO_BUS, CONFIG_SYS_CPU_PCI_IO_START, CONFIG_SYS_PCI_MSTR_IO_SIZE,
35536d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_POCMR2_MASK_ATTRIB: (MPC826x only)
3554a47a12beSStefan Roese		Overrides the default PCI memory map in arch/powerpc/cpu/mpc8260/pci.c if set.
35555d232d0eSwdenk
35569cacf4fcSDirk Eibach- CONFIG_PCI_DISABLE_PCIE:
35579cacf4fcSDirk Eibach		Disable PCI-Express on systems where it is supported but not
35589cacf4fcSDirk Eibach		required.
35599cacf4fcSDirk Eibach
356069fd2d3bSAndrew Sharp- CONFIG_PCI_ENUM_ONLY
356169fd2d3bSAndrew Sharp		Only scan through and get the devices on the busses.
356269fd2d3bSAndrew Sharp		Don't do any setup work, presumably because someone or
356369fd2d3bSAndrew Sharp		something has already done it, and we don't need to do it
356469fd2d3bSAndrew Sharp		a second time.	Useful for platforms that are pre-booted
356569fd2d3bSAndrew Sharp		by coreboot or similar.
356669fd2d3bSAndrew Sharp
3567a09b9b68SKumar Gala- CONFIG_SYS_SRIO:
3568a09b9b68SKumar Gala		Chip has SRIO or not
3569a09b9b68SKumar Gala
3570a09b9b68SKumar Gala- CONFIG_SRIO1:
3571a09b9b68SKumar Gala		Board has SRIO 1 port available
3572a09b9b68SKumar Gala
3573a09b9b68SKumar Gala- CONFIG_SRIO2:
3574a09b9b68SKumar Gala		Board has SRIO 2 port available
3575a09b9b68SKumar Gala
3576a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_VIRT:
3577a09b9b68SKumar Gala		Virtual Address of SRIO port 'n' memory region
3578a09b9b68SKumar Gala
3579a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_PHYS:
3580a09b9b68SKumar Gala		Physical Address of SRIO port 'n' memory region
3581a09b9b68SKumar Gala
3582a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_SIZE:
3583a09b9b68SKumar Gala		Size of SRIO port 'n' memory region
3584a09b9b68SKumar Gala
3585eced4626SAlex Waterman- CONFIG_SYS_NDFC_16
3586eced4626SAlex Waterman		Defined to tell the NDFC that the NAND chip is using a
3587eced4626SAlex Waterman		16 bit bus.
3588eced4626SAlex Waterman
3589eced4626SAlex Waterman- CONFIG_SYS_NDFC_EBC0_CFG
3590eced4626SAlex Waterman		Sets the EBC0_CFG register for the NDFC. If not defined
3591eced4626SAlex Waterman		a default value will be used.
3592eced4626SAlex Waterman
3593bb99ad6dSBen Warren- CONFIG_SPD_EEPROM
3594218ca724SWolfgang Denk		Get DDR timing information from an I2C EEPROM. Common
3595218ca724SWolfgang Denk		with pluggable memory modules such as SODIMMs
3596218ca724SWolfgang Denk
3597bb99ad6dSBen Warren  SPD_EEPROM_ADDRESS
3598bb99ad6dSBen Warren		I2C address of the SPD EEPROM
3599bb99ad6dSBen Warren
36006d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPD_BUS_NUM
3601218ca724SWolfgang Denk		If SPD EEPROM is on an I2C bus other than the first
3602218ca724SWolfgang Denk		one, specify here. Note that the value must resolve
3603218ca724SWolfgang Denk		to something your driver can deal with.
3604bb99ad6dSBen Warren
36051b3e3c4fSYork Sun- CONFIG_SYS_DDR_RAW_TIMING
36061b3e3c4fSYork Sun		Get DDR timing information from other than SPD. Common with
36071b3e3c4fSYork Sun		soldered DDR chips onboard without SPD. DDR raw timing
36081b3e3c4fSYork Sun		parameters are extracted from datasheet and hard-coded into
36091b3e3c4fSYork Sun		header files or board specific files.
36101b3e3c4fSYork Sun
36116f5e1dc5SYork Sun- CONFIG_FSL_DDR_INTERACTIVE
36126f5e1dc5SYork Sun		Enable interactive DDR debugging. See doc/README.fsl-ddr.
36136f5e1dc5SYork Sun
36146d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_83XX_DDR_USES_CS0
3615218ca724SWolfgang Denk		Only for 83xx systems. If specified, then DDR should
3616218ca724SWolfgang Denk		be configured using CS0 and CS1 instead of CS2 and CS3.
36172ad6b513STimur Tabi
3618c26e454dSwdenk- CONFIG_ETHER_ON_FEC[12]
3619c26e454dSwdenk		Define to enable FEC[12] on a 8xx series processor.
3620c26e454dSwdenk
3621c26e454dSwdenk- CONFIG_FEC[12]_PHY
3622c26e454dSwdenk		Define to the hardcoded PHY address which corresponds
36236e592385Swdenk		to the given FEC; i. e.
3624c26e454dSwdenk			#define CONFIG_FEC1_PHY 4
3625c26e454dSwdenk		means that the PHY with address 4 is connected to FEC1
3626c26e454dSwdenk
3627c26e454dSwdenk		When set to -1, means to probe for first available.
3628c26e454dSwdenk
3629c26e454dSwdenk- CONFIG_FEC[12]_PHY_NORXERR
3630c26e454dSwdenk		The PHY does not have a RXERR line (RMII only).
3631c26e454dSwdenk		(so program the FEC to ignore it).
3632c26e454dSwdenk
3633c26e454dSwdenk- CONFIG_RMII
3634c26e454dSwdenk		Enable RMII mode for all FECs.
3635c26e454dSwdenk		Note that this is a global option, we can't
3636c26e454dSwdenk		have one FEC in standard MII mode and another in RMII mode.
3637c26e454dSwdenk
36385cf91d6bSwdenk- CONFIG_CRC32_VERIFY
36395cf91d6bSwdenk		Add a verify option to the crc32 command.
36405cf91d6bSwdenk		The syntax is:
36415cf91d6bSwdenk
36425cf91d6bSwdenk		=> crc32 -v <address> <count> <crc32>
36435cf91d6bSwdenk
36445cf91d6bSwdenk		Where address/count indicate a memory area
36455cf91d6bSwdenk		and crc32 is the correct crc32 which the
36465cf91d6bSwdenk		area should have.
36475cf91d6bSwdenk
364856523f12Swdenk- CONFIG_LOOPW
364956523f12Swdenk		Add the "loopw" memory command. This only takes effect if
3650602ad3b3SJon Loeliger		the memory commands are activated globally (CONFIG_CMD_MEM).
365156523f12Swdenk
36527b466641Sstroese- CONFIG_MX_CYCLIC
36537b466641Sstroese		Add the "mdc" and "mwc" memory commands. These are cyclic
36547b466641Sstroese		"md/mw" commands.
36557b466641Sstroese		Examples:
36567b466641Sstroese
36577b466641Sstroese		=> mdc.b 10 4 500
36587b466641Sstroese		This command will print 4 bytes (10,11,12,13) each 500 ms.
36597b466641Sstroese
36607b466641Sstroese		=> mwc.l 100 12345678 10
36617b466641Sstroese		This command will write 12345678 to address 100 all 10 ms.
36627b466641Sstroese
36637b466641Sstroese		This only takes effect if the memory commands are activated
3664602ad3b3SJon Loeliger		globally (CONFIG_CMD_MEM).
36657b466641Sstroese
36668aa1a2d1Swdenk- CONFIG_SKIP_LOWLEVEL_INIT
3667afc1ce82SMacpaul Lin		[ARM, NDS32, MIPS only] If this variable is defined, then certain
3668e03f3169SWolfgang Denk		low level initializations (like setting up the memory
3669e03f3169SWolfgang Denk		controller) are omitted and/or U-Boot does not
3670e03f3169SWolfgang Denk		relocate itself into RAM.
36718aa1a2d1Swdenk
3672e03f3169SWolfgang Denk		Normally this variable MUST NOT be defined. The only
3673e03f3169SWolfgang Denk		exception is when U-Boot is loaded (to RAM) by some
3674e03f3169SWolfgang Denk		other boot loader or by a debugger which performs
3675e03f3169SWolfgang Denk		these initializations itself.
36768aa1a2d1Swdenk
3677401bb30bSAneesh V- CONFIG_SPL_BUILD
3678df81238bSMagnus Lilja		Modifies the behaviour of start.S when compiling a loader
3679df81238bSMagnus Lilja		that is executed before the actual U-Boot. E.g. when
3680df81238bSMagnus Lilja		compiling a NAND SPL.
3681400558b5Swdenk
3682d8834a13SMatthias Weisser- CONFIG_USE_ARCH_MEMCPY
3683d8834a13SMatthias Weisser  CONFIG_USE_ARCH_MEMSET
3684d8834a13SMatthias Weisser		If these options are used a optimized version of memcpy/memset will
3685d8834a13SMatthias Weisser		be used if available. These functions may be faster under some
3686d8834a13SMatthias Weisser		conditions but may increase the binary size.
3687d8834a13SMatthias Weisser
3688b16f521aSGabe Black- CONFIG_X86_NO_RESET_VECTOR
3689b16f521aSGabe Black		If defined, the x86 reset vector code is excluded. You will need
3690b16f521aSGabe Black		to do this when U-Boot is running from Coreboot.
3691b16f521aSGabe Black
36925b5ece9eSGabe Black- CONFIG_X86_NO_REAL_MODE
36935b5ece9eSGabe Black		If defined, x86 real mode code is omitted. This assumes a
36945b5ece9eSGabe Black		32-bit environment where such code is not needed. You will
36955b5ece9eSGabe Black		need to do this when U-Boot is running from Coreboot.
36965b5ece9eSGabe Black
36975b5ece9eSGabe Black
3698f2717b47STimur TabiFreescale QE/FMAN Firmware Support:
3699f2717b47STimur Tabi-----------------------------------
3700f2717b47STimur Tabi
3701f2717b47STimur TabiThe Freescale QUICCEngine (QE) and Frame Manager (FMAN) both support the
3702f2717b47STimur Tabiloading of "firmware", which is encoded in the QE firmware binary format.
3703f2717b47STimur TabiThis firmware often needs to be loaded during U-Boot booting, so macros
3704f2717b47STimur Tabiare used to identify the storage device (NOR flash, SPI, etc) and the address
3705f2717b47STimur Tabiwithin that device.
3706f2717b47STimur Tabi
3707f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_ADDR
3708f2717b47STimur Tabi	The address in the storage device where the firmware is located.  The
3709f2717b47STimur Tabi	meaning of this address depends on which CONFIG_SYS_QE_FW_IN_xxx macro
3710f2717b47STimur Tabi	is also specified.
3711f2717b47STimur Tabi
3712f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_LENGTH
3713f2717b47STimur Tabi	The maximum possible size of the firmware.  The firmware binary format
3714f2717b47STimur Tabi	has a field that specifies the actual size of the firmware, but it
3715f2717b47STimur Tabi	might not be possible to read any part of the firmware unless some
3716f2717b47STimur Tabi	local storage is allocated to hold the entire firmware first.
3717f2717b47STimur Tabi
3718f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_NOR
3719f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located in NOR flash, mapped as
3720f2717b47STimur Tabi	normal addressable memory via the LBC.  CONFIG_SYS_FMAN_FW_ADDR is the
3721f2717b47STimur Tabi	virtual address in NOR flash.
3722f2717b47STimur Tabi
3723f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_NAND
3724f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located in NAND flash.
3725f2717b47STimur Tabi	CONFIG_SYS_FMAN_FW_ADDR is the offset within NAND flash.
3726f2717b47STimur Tabi
3727f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_MMC
3728f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located on the primary SD/MMC
3729f2717b47STimur Tabi	device.  CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device.
3730f2717b47STimur Tabi
3731f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_SPIFLASH
3732f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located on the primary SPI
3733f2717b47STimur Tabi	device.  CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device.
3734f2717b47STimur Tabi
3735292dc6c5SLiu Gang- CONFIG_SYS_QE_FMAN_FW_IN_REMOTE
3736292dc6c5SLiu Gang	Specifies that QE/FMAN firmware is located in the remote (master)
3737292dc6c5SLiu Gang	memory space.	CONFIG_SYS_FMAN_FW_ADDR is a virtual address which
3738fc54c7faSLiu Gang	can be mapped from slave TLB->slave LAW->slave SRIO or PCIE outbound
3739fc54c7faSLiu Gang	window->master inbound window->master LAW->the ucode address in
3740fc54c7faSLiu Gang	master's memory space.
3741f2717b47STimur Tabi
3742c609719bSwdenkBuilding the Software:
3743c609719bSwdenk======================
3744c609719bSwdenk
3745218ca724SWolfgang DenkBuilding U-Boot has been tested in several native build environments
3746218ca724SWolfgang Denkand in many different cross environments. Of course we cannot support
3747218ca724SWolfgang Denkall possibly existing versions of cross development tools in all
3748218ca724SWolfgang Denk(potentially obsolete) versions. In case of tool chain problems we
3749218ca724SWolfgang Denkrecommend to use the ELDK (see http://www.denx.de/wiki/DULG/ELDK)
3750218ca724SWolfgang Denkwhich is extensively used to build and test U-Boot.
3751c609719bSwdenk
3752218ca724SWolfgang DenkIf you are not using a native environment, it is assumed that you
3753218ca724SWolfgang Denkhave GNU cross compiling tools available in your path. In this case,
3754218ca724SWolfgang Denkyou must set the environment variable CROSS_COMPILE in your shell.
3755218ca724SWolfgang DenkNote that no changes to the Makefile or any other source files are
3756218ca724SWolfgang Denknecessary. For example using the ELDK on a 4xx CPU, please enter:
3757c609719bSwdenk
3758218ca724SWolfgang Denk	$ CROSS_COMPILE=ppc_4xx-
3759218ca724SWolfgang Denk	$ export CROSS_COMPILE
3760c609719bSwdenk
37612f8d396bSPeter TyserNote: If you wish to generate Windows versions of the utilities in
37622f8d396bSPeter Tyser      the tools directory you can use the MinGW toolchain
37632f8d396bSPeter Tyser      (http://www.mingw.org).  Set your HOST tools to the MinGW
37642f8d396bSPeter Tyser      toolchain and execute 'make tools'.  For example:
37652f8d396bSPeter Tyser
37662f8d396bSPeter Tyser       $ make HOSTCC=i586-mingw32msvc-gcc HOSTSTRIP=i586-mingw32msvc-strip tools
37672f8d396bSPeter Tyser
37682f8d396bSPeter Tyser      Binaries such as tools/mkimage.exe will be created which can
37692f8d396bSPeter Tyser      be executed on computers running Windows.
37702f8d396bSPeter Tyser
3771c609719bSwdenkU-Boot is intended to be simple to build. After installing the
3772c609719bSwdenksources you must configure U-Boot for one specific board type. This
3773c609719bSwdenkis done by typing:
3774c609719bSwdenk
3775c609719bSwdenk	make NAME_config
3776c609719bSwdenk
3777218ca724SWolfgang Denkwhere "NAME_config" is the name of one of the existing configu-
37784d675ae6SMichael Jonesrations; see boards.cfg for supported names.
377954387ac9Swdenk
3780c609719bSwdenkNote: for some board special configuration names may exist; check if
3781c609719bSwdenk      additional information is available from the board vendor; for
37822729af9dSwdenk      instance, the TQM823L systems are available without (standard)
37832729af9dSwdenk      or with LCD support. You can select such additional "features"
378411ccc33fSMarcel Ziswiler      when choosing the configuration, i. e.
3785c609719bSwdenk
37862729af9dSwdenk      make TQM823L_config
37872729af9dSwdenk	- will configure for a plain TQM823L, i. e. no LCD support
3788c609719bSwdenk
3789c609719bSwdenk      make TQM823L_LCD_config
3790c609719bSwdenk	- will configure for a TQM823L with U-Boot console on LCD
3791c609719bSwdenk
3792c609719bSwdenk      etc.
3793c609719bSwdenk
3794c609719bSwdenk
3795c609719bSwdenkFinally, type "make all", and you should get some working U-Boot
37967152b1d0Swdenkimages ready for download to / installation on your system:
3797c609719bSwdenk
3798c609719bSwdenk- "u-boot.bin" is a raw binary image
3799c609719bSwdenk- "u-boot" is an image in ELF binary format
3800c609719bSwdenk- "u-boot.srec" is in Motorola S-Record format
3801c609719bSwdenk
3802baf31249SMarian BalakowiczBy default the build is performed locally and the objects are saved
3803baf31249SMarian Balakowiczin the source directory. One of the two methods can be used to change
3804baf31249SMarian Balakowiczthis behavior and build U-Boot to some external directory:
3805baf31249SMarian Balakowicz
3806baf31249SMarian Balakowicz1. Add O= to the make command line invocations:
3807baf31249SMarian Balakowicz
3808baf31249SMarian Balakowicz	make O=/tmp/build distclean
3809baf31249SMarian Balakowicz	make O=/tmp/build NAME_config
3810baf31249SMarian Balakowicz	make O=/tmp/build all
3811baf31249SMarian Balakowicz
3812baf31249SMarian Balakowicz2. Set environment variable BUILD_DIR to point to the desired location:
3813baf31249SMarian Balakowicz
3814baf31249SMarian Balakowicz	export BUILD_DIR=/tmp/build
3815baf31249SMarian Balakowicz	make distclean
3816baf31249SMarian Balakowicz	make NAME_config
3817baf31249SMarian Balakowicz	make all
3818baf31249SMarian Balakowicz
3819baf31249SMarian BalakowiczNote that the command line "O=" setting overrides the BUILD_DIR environment
3820baf31249SMarian Balakowiczvariable.
3821baf31249SMarian Balakowicz
3822c609719bSwdenk
3823c609719bSwdenkPlease be aware that the Makefiles assume you are using GNU make, so
3824c609719bSwdenkfor instance on NetBSD you might need to use "gmake" instead of
3825c609719bSwdenknative "make".
3826c609719bSwdenk
3827c609719bSwdenk
3828c609719bSwdenkIf the system board that you have is not listed, then you will need
3829c609719bSwdenkto port U-Boot to your hardware platform. To do this, follow these
3830c609719bSwdenksteps:
3831c609719bSwdenk
3832c609719bSwdenk1.  Add a new configuration option for your board to the toplevel
38334d675ae6SMichael Jones    "boards.cfg" file, using the existing entries as examples.
38344d675ae6SMichael Jones    Follow the instructions there to keep the boards in order.
3835c609719bSwdenk2.  Create a new directory to hold your board specific code. Add any
383685ec0bccSwdenk    files you need. In your board directory, you will need at least
383785ec0bccSwdenk    the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds".
383885ec0bccSwdenk3.  Create a new configuration file "include/configs/<board>.h" for
383985ec0bccSwdenk    your board
3840c609719bSwdenk3.  If you're porting U-Boot to a new CPU, then also create a new
3841c609719bSwdenk    directory to hold your CPU specific code. Add any files you need.
384285ec0bccSwdenk4.  Run "make <board>_config" with your new name.
3843c609719bSwdenk5.  Type "make", and you should get a working "u-boot.srec" file
3844c609719bSwdenk    to be installed on your target system.
384585ec0bccSwdenk6.  Debug and solve any problems that might arise.
3846c609719bSwdenk    [Of course, this last step is much harder than it sounds.]
3847c609719bSwdenk
3848c609719bSwdenk
3849c609719bSwdenkTesting of U-Boot Modifications, Ports to New Hardware, etc.:
3850c609719bSwdenk==============================================================
3851c609719bSwdenk
3852c609719bSwdenkIf you have modified U-Boot sources (for instance added a new board
3853c609719bSwdenkor support for new devices, a new CPU, etc.) you are expected to
3854c609719bSwdenkprovide feedback to the other developers. The feedback normally takes
3855c609719bSwdenkthe form of a "patch", i. e. a context diff against a certain (latest
3856218ca724SWolfgang Denkofficial or latest in the git repository) version of U-Boot sources.
3857c609719bSwdenk
3858c609719bSwdenkBut before you submit such a patch, please verify that your modifi-
3859c609719bSwdenkcation did not break existing code. At least make sure that *ALL* of
3860c609719bSwdenkthe supported boards compile WITHOUT ANY compiler warnings. To do so,
3861c609719bSwdenkjust run the "MAKEALL" script, which will configure and build U-Boot
3862c609719bSwdenkfor ALL supported system. Be warned, this will take a while. You can
38637152b1d0Swdenkselect which (cross) compiler to use by passing a `CROSS_COMPILE'
3864218ca724SWolfgang Denkenvironment variable to the script, i. e. to use the ELDK cross tools
3865218ca724SWolfgang Denkyou can type
3866c609719bSwdenk
3867c609719bSwdenk	CROSS_COMPILE=ppc_8xx- MAKEALL
3868c609719bSwdenk
3869c609719bSwdenkor to build on a native PowerPC system you can type
3870c609719bSwdenk
3871c609719bSwdenk	CROSS_COMPILE=' ' MAKEALL
3872c609719bSwdenk
3873218ca724SWolfgang DenkWhen using the MAKEALL script, the default behaviour is to build
3874218ca724SWolfgang DenkU-Boot in the source directory. This location can be changed by
3875218ca724SWolfgang Denksetting the BUILD_DIR environment variable. Also, for each target
3876218ca724SWolfgang Denkbuilt, the MAKEALL script saves two log files (<target>.ERR and
3877218ca724SWolfgang Denk<target>.MAKEALL) in the <source dir>/LOG directory. This default
3878218ca724SWolfgang Denklocation can be changed by setting the MAKEALL_LOGDIR environment
3879218ca724SWolfgang Denkvariable. For example:
3880baf31249SMarian Balakowicz
3881baf31249SMarian Balakowicz	export BUILD_DIR=/tmp/build
3882baf31249SMarian Balakowicz	export MAKEALL_LOGDIR=/tmp/log
3883baf31249SMarian Balakowicz	CROSS_COMPILE=ppc_8xx- MAKEALL
3884baf31249SMarian Balakowicz
3885218ca724SWolfgang DenkWith the above settings build objects are saved in the /tmp/build,
3886218ca724SWolfgang Denklog files are saved in the /tmp/log and the source tree remains clean
3887218ca724SWolfgang Denkduring the whole build process.
3888baf31249SMarian Balakowicz
3889baf31249SMarian Balakowicz
3890c609719bSwdenkSee also "U-Boot Porting Guide" below.
3891c609719bSwdenk
3892c609719bSwdenk
3893c609719bSwdenkMonitor Commands - Overview:
3894c609719bSwdenk============================
3895c609719bSwdenk
3896c609719bSwdenkgo	- start application at address 'addr'
3897c609719bSwdenkrun	- run commands in an environment variable
3898c609719bSwdenkbootm	- boot application image from memory
3899c609719bSwdenkbootp	- boot image via network using BootP/TFTP protocol
390044f074c7SMarek Vasutbootz   - boot zImage from memory
3901c609719bSwdenktftpboot- boot image via network using TFTP protocol
3902c609719bSwdenk	       and env variables "ipaddr" and "serverip"
3903c609719bSwdenk	       (and eventually "gatewayip")
39041fb7cd49SSimon Glasstftpput - upload a file via network using TFTP protocol
3905c609719bSwdenkrarpboot- boot image via network using RARP/TFTP protocol
3906c609719bSwdenkdiskboot- boot from IDE devicebootd   - boot default, i.e., run 'bootcmd'
3907c609719bSwdenkloads	- load S-Record file over serial line
3908c609719bSwdenkloadb	- load binary file over serial line (kermit mode)
3909c609719bSwdenkmd	- memory display
3910c609719bSwdenkmm	- memory modify (auto-incrementing)
3911c609719bSwdenknm	- memory modify (constant address)
3912c609719bSwdenkmw	- memory write (fill)
3913c609719bSwdenkcp	- memory copy
3914c609719bSwdenkcmp	- memory compare
3915c609719bSwdenkcrc32	- checksum calculation
39160f89c54bSPeter Tyseri2c	- I2C sub-system
3917c609719bSwdenksspi	- SPI utility commands
3918c609719bSwdenkbase	- print or set address offset
3919c609719bSwdenkprintenv- print environment variables
3920c609719bSwdenksetenv	- set environment variables
3921c609719bSwdenksaveenv - save environment variables to persistent storage
3922c609719bSwdenkprotect - enable or disable FLASH write protection
3923c609719bSwdenkerase	- erase FLASH memory
3924c609719bSwdenkflinfo	- print FLASH memory information
392510635afaSKarl O. Pincnand	- NAND memory operations (see doc/README.nand)
3926c609719bSwdenkbdinfo	- print Board Info structure
3927c609719bSwdenkiminfo	- print header information for application image
3928c609719bSwdenkconinfo - print console devices and informations
3929c609719bSwdenkide	- IDE sub-system
3930c609719bSwdenkloop	- infinite loop on address range
393156523f12Swdenkloopw	- infinite write loop on address range
3932c609719bSwdenkmtest	- simple RAM test
3933c609719bSwdenkicache	- enable or disable instruction cache
3934c609719bSwdenkdcache	- enable or disable data cache
3935c609719bSwdenkreset	- Perform RESET of the CPU
3936c609719bSwdenkecho	- echo args to console
3937c609719bSwdenkversion - print monitor version
3938c609719bSwdenkhelp	- print online help
3939c609719bSwdenk?	- alias for 'help'
3940c609719bSwdenk
3941c609719bSwdenk
3942c609719bSwdenkMonitor Commands - Detailed Description:
3943c609719bSwdenk========================================
3944c609719bSwdenk
3945c609719bSwdenkTODO.
3946c609719bSwdenk
3947c609719bSwdenkFor now: just type "help <command>".
3948c609719bSwdenk
3949c609719bSwdenk
3950c609719bSwdenkEnvironment Variables:
3951c609719bSwdenk======================
3952c609719bSwdenk
3953c609719bSwdenkU-Boot supports user configuration using Environment Variables which
3954c609719bSwdenkcan be made persistent by saving to Flash memory.
3955c609719bSwdenk
3956c609719bSwdenkEnvironment Variables are set using "setenv", printed using
3957c609719bSwdenk"printenv", and saved to Flash using "saveenv". Using "setenv"
3958c609719bSwdenkwithout a value can be used to delete a variable from the
3959c609719bSwdenkenvironment. As long as you don't save the environment you are
3960c609719bSwdenkworking with an in-memory copy. In case the Flash area containing the
3961c609719bSwdenkenvironment is erased by accident, a default environment is provided.
3962c609719bSwdenk
3963c96f86eeSWolfgang DenkSome configuration options can be set using Environment Variables.
3964c96f86eeSWolfgang Denk
3965c96f86eeSWolfgang DenkList of environment variables (most likely not complete):
3966c609719bSwdenk
3967c609719bSwdenk  baudrate	- see CONFIG_BAUDRATE
3968c609719bSwdenk
3969c609719bSwdenk  bootdelay	- see CONFIG_BOOTDELAY
3970c609719bSwdenk
3971c609719bSwdenk  bootcmd	- see CONFIG_BOOTCOMMAND
3972c609719bSwdenk
3973c609719bSwdenk  bootargs	- Boot arguments when booting an RTOS image
3974c609719bSwdenk
3975c609719bSwdenk  bootfile	- Name of the image to load with TFTP
3976c609719bSwdenk
39777d721e34SBartlomiej Sieka  bootm_low	- Memory range available for image processing in the bootm
39787d721e34SBartlomiej Sieka		  command can be restricted. This variable is given as
39797d721e34SBartlomiej Sieka		  a hexadecimal number and defines lowest address allowed
39807d721e34SBartlomiej Sieka		  for use by the bootm command. See also "bootm_size"
39817d721e34SBartlomiej Sieka		  environment variable. Address defined by "bootm_low" is
39827d721e34SBartlomiej Sieka		  also the base of the initial memory mapping for the Linux
3983c3624e6eSGrant Likely		  kernel -- see the description of CONFIG_SYS_BOOTMAPSZ and
3984c3624e6eSGrant Likely		  bootm_mapsize.
3985c3624e6eSGrant Likely
3986c3624e6eSGrant Likely  bootm_mapsize - Size of the initial memory mapping for the Linux kernel.
3987c3624e6eSGrant Likely		  This variable is given as a hexadecimal number and it
3988c3624e6eSGrant Likely		  defines the size of the memory region starting at base
3989c3624e6eSGrant Likely		  address bootm_low that is accessible by the Linux kernel
3990c3624e6eSGrant Likely		  during early boot.  If unset, CONFIG_SYS_BOOTMAPSZ is used
3991c3624e6eSGrant Likely		  as the default value if it is defined, and bootm_size is
3992c3624e6eSGrant Likely		  used otherwise.
39937d721e34SBartlomiej Sieka
39947d721e34SBartlomiej Sieka  bootm_size	- Memory range available for image processing in the bootm
39957d721e34SBartlomiej Sieka		  command can be restricted. This variable is given as
39967d721e34SBartlomiej Sieka		  a hexadecimal number and defines the size of the region
39977d721e34SBartlomiej Sieka		  allowed for use by the bootm command. See also "bootm_low"
39987d721e34SBartlomiej Sieka		  environment variable.
39997d721e34SBartlomiej Sieka
40004bae9090SBartlomiej Sieka  updatefile	- Location of the software update file on a TFTP server, used
40014bae9090SBartlomiej Sieka		  by the automatic software update feature. Please refer to
40024bae9090SBartlomiej Sieka		  documentation in doc/README.update for more details.
40034bae9090SBartlomiej Sieka
4004c609719bSwdenk  autoload	- if set to "no" (any string beginning with 'n'),
4005c609719bSwdenk		  "bootp" will just load perform a lookup of the
4006c609719bSwdenk		  configuration from the BOOTP server, but not try to
4007c609719bSwdenk		  load any image using TFTP
4008c609719bSwdenk
4009c609719bSwdenk  autostart	- if set to "yes", an image loaded using the "bootp",
4010c609719bSwdenk		  "rarpboot", "tftpboot" or "diskboot" commands will
4011c609719bSwdenk		  be automatically started (by internally calling
4012c609719bSwdenk		  "bootm")
4013c609719bSwdenk
40144a6fd34bSwdenk		  If set to "no", a standalone image passed to the
40154a6fd34bSwdenk		  "bootm" command will be copied to the load address
40164a6fd34bSwdenk		  (and eventually uncompressed), but NOT be started.
40174a6fd34bSwdenk		  This can be used to load and uncompress arbitrary
40184a6fd34bSwdenk		  data.
40194a6fd34bSwdenk
4020a28afca5SDavid A. Long  fdt_high	- if set this restricts the maximum address that the
4021a28afca5SDavid A. Long		  flattened device tree will be copied into upon boot.
4022fa34f6b2SShawn Guo		  For example, if you have a system with 1 GB memory
4023fa34f6b2SShawn Guo		  at physical address 0x10000000, while Linux kernel
4024fa34f6b2SShawn Guo		  only recognizes the first 704 MB as low memory, you
4025fa34f6b2SShawn Guo		  may need to set fdt_high as 0x3C000000 to have the
4026fa34f6b2SShawn Guo		  device tree blob be copied to the maximum address
4027fa34f6b2SShawn Guo		  of the 704 MB low memory, so that Linux kernel can
4028fa34f6b2SShawn Guo		  access it during the boot procedure.
4029fa34f6b2SShawn Guo
4030a28afca5SDavid A. Long		  If this is set to the special value 0xFFFFFFFF then
4031a28afca5SDavid A. Long		  the fdt will not be copied at all on boot.  For this
4032a28afca5SDavid A. Long		  to work it must reside in writable memory, have
4033a28afca5SDavid A. Long		  sufficient padding on the end of it for u-boot to
4034a28afca5SDavid A. Long		  add the information it needs into it, and the memory
4035a28afca5SDavid A. Long		  must be accessible by the kernel.
4036a28afca5SDavid A. Long
4037eea63e05SSimon Glass  fdtcontroladdr- if set this is the address of the control flattened
4038eea63e05SSimon Glass		  device tree used by U-Boot when CONFIG_OF_CONTROL is
4039eea63e05SSimon Glass		  defined.
4040eea63e05SSimon Glass
404117ea1177Swdenk  i2cfast	- (PPC405GP|PPC405EP only)
404217ea1177Swdenk		  if set to 'y' configures Linux I2C driver for fast
404317ea1177Swdenk		  mode (400kHZ). This environment variable is used in
404417ea1177Swdenk		  initialization code. So, for changes to be effective
404517ea1177Swdenk		  it must be saved and board must be reset.
404617ea1177Swdenk
4047c609719bSwdenk  initrd_high	- restrict positioning of initrd images:
4048c609719bSwdenk		  If this variable is not set, initrd images will be
4049c609719bSwdenk		  copied to the highest possible address in RAM; this
4050c609719bSwdenk		  is usually what you want since it allows for
4051c609719bSwdenk		  maximum initrd size. If for some reason you want to
4052c609719bSwdenk		  make sure that the initrd image is loaded below the
40536d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		  CONFIG_SYS_BOOTMAPSZ limit, you can set this environment
4054c609719bSwdenk		  variable to a value of "no" or "off" or "0".
4055c609719bSwdenk		  Alternatively, you can set it to a maximum upper
4056c609719bSwdenk		  address to use (U-Boot will still check that it
4057c609719bSwdenk		  does not overwrite the U-Boot stack and data).
4058c609719bSwdenk
4059c609719bSwdenk		  For instance, when you have a system with 16 MB
40607152b1d0Swdenk		  RAM, and want to reserve 4 MB from use by Linux,
4061c609719bSwdenk		  you can do this by adding "mem=12M" to the value of
4062c609719bSwdenk		  the "bootargs" variable. However, now you must make
40637152b1d0Swdenk		  sure that the initrd image is placed in the first
4064c609719bSwdenk		  12 MB as well - this can be done with
4065c609719bSwdenk
4066c609719bSwdenk		  setenv initrd_high 00c00000
4067c609719bSwdenk
406838b99261Swdenk		  If you set initrd_high to 0xFFFFFFFF, this is an
406938b99261Swdenk		  indication to U-Boot that all addresses are legal
407038b99261Swdenk		  for the Linux kernel, including addresses in flash
407138b99261Swdenk		  memory. In this case U-Boot will NOT COPY the
407238b99261Swdenk		  ramdisk at all. This may be useful to reduce the
407338b99261Swdenk		  boot time on your system, but requires that this
407438b99261Swdenk		  feature is supported by your Linux kernel.
407538b99261Swdenk
4076c609719bSwdenk  ipaddr	- IP address; needed for tftpboot command
4077c609719bSwdenk
4078c609719bSwdenk  loadaddr	- Default load address for commands like "bootp",
4079dc7c9a1aSwdenk		  "rarpboot", "tftpboot", "loadb" or "diskboot"
4080c609719bSwdenk
4081c609719bSwdenk  loads_echo	- see CONFIG_LOADS_ECHO
4082c609719bSwdenk
4083c609719bSwdenk  serverip	- TFTP server IP address; needed for tftpboot command
4084c609719bSwdenk
4085c609719bSwdenk  bootretry	- see CONFIG_BOOT_RETRY_TIME
4086c609719bSwdenk
4087c609719bSwdenk  bootdelaykey	- see CONFIG_AUTOBOOT_DELAY_STR
4088c609719bSwdenk
4089c609719bSwdenk  bootstopkey	- see CONFIG_AUTOBOOT_STOP_STR
4090c609719bSwdenk
4091e2a53458SMike Frysinger  ethprime	- controls which interface is used first.
4092a3d991bdSwdenk
4093e2a53458SMike Frysinger  ethact	- controls which interface is currently active.
4094e2a53458SMike Frysinger		  For example you can do the following
4095a3d991bdSwdenk
409648690d80SHeiko Schocher		  => setenv ethact FEC
409748690d80SHeiko Schocher		  => ping 192.168.0.1 # traffic sent on FEC
409848690d80SHeiko Schocher		  => setenv ethact SCC
409948690d80SHeiko Schocher		  => ping 10.0.0.1 # traffic sent on SCC
4100a3d991bdSwdenk
4101e1692577SMatthias Fuchs  ethrotate	- When set to "no" U-Boot does not go through all
4102e1692577SMatthias Fuchs		  available network interfaces.
4103e1692577SMatthias Fuchs		  It just stays at the currently selected interface.
4104e1692577SMatthias Fuchs
4105a3d991bdSwdenk  netretry	- When set to "no" each network operation will
4106a3d991bdSwdenk		  either succeed or fail without retrying.
41076e592385Swdenk		  When set to "once" the network operation will
41086e592385Swdenk		  fail when all the available network interfaces
41096e592385Swdenk		  are tried once without success.
4110a3d991bdSwdenk		  Useful on scripts which control the retry operation
4111a3d991bdSwdenk		  themselves.
4112a3d991bdSwdenk
4113b4e2f89dSJean-Christophe PLAGNIOL-VILLARD  npe_ucode	- set load address for the NPE microcode
4114a1cf027aSJean-Christophe PLAGNIOL-VILLARD
411528cb9375SWolfgang Denk  tftpsrcport	- If this is set, the value is used for TFTP's
4116ecb0ccd9SWolfgang Denk		  UDP source port.
4117ecb0ccd9SWolfgang Denk
411828cb9375SWolfgang Denk  tftpdstport	- If this is set, the value is used for TFTP's UDP
411928cb9375SWolfgang Denk		  destination port instead of the Well Know Port 69.
412028cb9375SWolfgang Denk
4121c96f86eeSWolfgang Denk  tftpblocksize - Block size to use for TFTP transfers; if not set,
4122c96f86eeSWolfgang Denk		  we use the TFTP server's default block size
4123c96f86eeSWolfgang Denk
4124c96f86eeSWolfgang Denk  tftptimeout	- Retransmission timeout for TFTP packets (in milli-
4125c96f86eeSWolfgang Denk		  seconds, minimum value is 1000 = 1 second). Defines
4126c96f86eeSWolfgang Denk		  when a packet is considered to be lost so it has to
4127c96f86eeSWolfgang Denk		  be retransmitted. The default is 5000 = 5 seconds.
4128c96f86eeSWolfgang Denk		  Lowering this value may make downloads succeed
4129c96f86eeSWolfgang Denk		  faster in networks with high packet loss rates or
4130c96f86eeSWolfgang Denk		  with unreliable TFTP servers.
4131c96f86eeSWolfgang Denk
4132a3d991bdSwdenk  vlan		- When set to a value < 4095 the traffic over
413311ccc33fSMarcel Ziswiler		  Ethernet is encapsulated/received over 802.1q
4134a3d991bdSwdenk		  VLAN tagged frames.
4135c609719bSwdenk
4136dc0b7b0eSJason HobbsThe following image location variables contain the location of images
4137dc0b7b0eSJason Hobbsused in booting. The "Image" column gives the role of the image and is
4138dc0b7b0eSJason Hobbsnot an environment variable name. The other columns are environment
4139dc0b7b0eSJason Hobbsvariable names. "File Name" gives the name of the file on a TFTP
4140dc0b7b0eSJason Hobbsserver, "RAM Address" gives the location in RAM the image will be
4141dc0b7b0eSJason Hobbsloaded to, and "Flash Location" gives the image's address in NOR
4142dc0b7b0eSJason Hobbsflash or offset in NAND flash.
4143dc0b7b0eSJason Hobbs
4144dc0b7b0eSJason Hobbs*Note* - these variables don't have to be defined for all boards, some
4145dc0b7b0eSJason Hobbsboards currenlty use other variables for these purposes, and some
4146dc0b7b0eSJason Hobbsboards use these variables for other purposes.
4147dc0b7b0eSJason Hobbs
4148dc0b7b0eSJason HobbsImage		    File Name	     RAM Address       Flash Location
4149dc0b7b0eSJason Hobbs-----		    ---------	     -----------       --------------
4150dc0b7b0eSJason Hobbsu-boot		    u-boot	     u-boot_addr_r     u-boot_addr
4151dc0b7b0eSJason HobbsLinux kernel	    bootfile	     kernel_addr_r     kernel_addr
4152dc0b7b0eSJason Hobbsdevice tree blob    fdtfile	     fdt_addr_r	       fdt_addr
4153dc0b7b0eSJason Hobbsramdisk		    ramdiskfile	     ramdisk_addr_r    ramdisk_addr
4154dc0b7b0eSJason Hobbs
4155c609719bSwdenkThe following environment variables may be used and automatically
4156c609719bSwdenkupdated by the network boot commands ("bootp" and "rarpboot"),
4157c609719bSwdenkdepending the information provided by your boot server:
4158c609719bSwdenk
4159c609719bSwdenk  bootfile	- see above
4160c609719bSwdenk  dnsip		- IP address of your Domain Name Server
4161fe389a82Sstroese  dnsip2	- IP address of your secondary Domain Name Server
4162c609719bSwdenk  gatewayip	- IP address of the Gateway (Router) to use
4163c609719bSwdenk  hostname	- Target hostname
4164c609719bSwdenk  ipaddr	- see above
4165c609719bSwdenk  netmask	- Subnet Mask
4166c609719bSwdenk  rootpath	- Pathname of the root filesystem on the NFS server
4167c609719bSwdenk  serverip	- see above
4168c609719bSwdenk
4169c609719bSwdenk
4170c609719bSwdenkThere are two special Environment Variables:
4171c609719bSwdenk
4172c609719bSwdenk  serial#	- contains hardware identification information such
4173c609719bSwdenk		  as type string and/or serial number
4174c609719bSwdenk  ethaddr	- Ethernet address
4175c609719bSwdenk
4176c609719bSwdenkThese variables can be set only once (usually during manufacturing of
4177c609719bSwdenkthe board). U-Boot refuses to delete or overwrite these variables
4178c609719bSwdenkonce they have been set once.
4179c609719bSwdenk
4180c609719bSwdenk
4181c1551ea8SstroeseFurther special Environment Variables:
4182c1551ea8Sstroese
4183c1551ea8Sstroese  ver		- Contains the U-Boot version string as printed
4184c1551ea8Sstroese		  with the "version" command. This variable is
4185c1551ea8Sstroese		  readonly (see CONFIG_VERSION_VARIABLE).
4186c1551ea8Sstroese
4187c1551ea8Sstroese
4188c609719bSwdenkPlease note that changes to some configuration parameters may take
4189c609719bSwdenkonly effect after the next boot (yes, that's just like Windoze :-).
4190c609719bSwdenk
4191c609719bSwdenk
4192f07771ccSwdenkCommand Line Parsing:
4193f07771ccSwdenk=====================
4194f07771ccSwdenk
4195f07771ccSwdenkThere are two different command line parsers available with U-Boot:
41967152b1d0Swdenkthe old "simple" one, and the much more powerful "hush" shell:
4197f07771ccSwdenk
4198f07771ccSwdenkOld, simple command line parser:
4199f07771ccSwdenk--------------------------------
4200f07771ccSwdenk
4201f07771ccSwdenk- supports environment variables (through setenv / saveenv commands)
4202f07771ccSwdenk- several commands on one line, separated by ';'
4203fe126d8bSWolfgang Denk- variable substitution using "... ${name} ..." syntax
4204f07771ccSwdenk- special characters ('$', ';') can be escaped by prefixing with '\',
4205f07771ccSwdenk  for example:
4206fe126d8bSWolfgang Denk	setenv bootcmd bootm \${address}
4207f07771ccSwdenk- You can also escape text by enclosing in single apostrophes, for example:
4208f07771ccSwdenk	setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off'
4209f07771ccSwdenk
4210f07771ccSwdenkHush shell:
4211f07771ccSwdenk-----------
4212f07771ccSwdenk
4213f07771ccSwdenk- similar to Bourne shell, with control structures like
4214f07771ccSwdenk  if...then...else...fi, for...do...done; while...do...done,
4215f07771ccSwdenk  until...do...done, ...
4216f07771ccSwdenk- supports environment ("global") variables (through setenv / saveenv
4217f07771ccSwdenk  commands) and local shell variables (through standard shell syntax
4218f07771ccSwdenk  "name=value"); only environment variables can be used with "run"
4219f07771ccSwdenk  command
4220f07771ccSwdenk
4221f07771ccSwdenkGeneral rules:
4222f07771ccSwdenk--------------
4223f07771ccSwdenk
4224f07771ccSwdenk(1) If a command line (or an environment variable executed by a "run"
4225f07771ccSwdenk    command) contains several commands separated by semicolon, and
4226f07771ccSwdenk    one of these commands fails, then the remaining commands will be
4227f07771ccSwdenk    executed anyway.
4228f07771ccSwdenk
4229f07771ccSwdenk(2) If you execute several variables with one call to run (i. e.
423011ccc33fSMarcel Ziswiler    calling run with a list of variables as arguments), any failing
4231f07771ccSwdenk    command will cause "run" to terminate, i. e. the remaining
4232f07771ccSwdenk    variables are not executed.
4233f07771ccSwdenk
4234c609719bSwdenkNote for Redundant Ethernet Interfaces:
4235c609719bSwdenk=======================================
4236c609719bSwdenk
423711ccc33fSMarcel ZiswilerSome boards come with redundant Ethernet interfaces; U-Boot supports
4238c609719bSwdenksuch configurations and is capable of automatic selection of a
42397152b1d0Swdenk"working" interface when needed. MAC assignment works as follows:
4240c609719bSwdenk
4241c609719bSwdenkNetwork interfaces are numbered eth0, eth1, eth2, ... Corresponding
4242c609719bSwdenkMAC addresses can be stored in the environment as "ethaddr" (=>eth0),
4243c609719bSwdenk"eth1addr" (=>eth1), "eth2addr", ...
4244c609719bSwdenk
4245c609719bSwdenkIf the network interface stores some valid MAC address (for instance
4246c609719bSwdenkin SROM), this is used as default address if there is NO correspon-
4247c609719bSwdenkding setting in the environment; if the corresponding environment
4248c609719bSwdenkvariable is set, this overrides the settings in the card; that means:
4249c609719bSwdenk
4250c609719bSwdenko If the SROM has a valid MAC address, and there is no address in the
4251c609719bSwdenk  environment, the SROM's address is used.
4252c609719bSwdenk
4253c609719bSwdenko If there is no valid address in the SROM, and a definition in the
4254c609719bSwdenk  environment exists, then the value from the environment variable is
4255c609719bSwdenk  used.
4256c609719bSwdenk
4257c609719bSwdenko If both the SROM and the environment contain a MAC address, and
4258c609719bSwdenk  both addresses are the same, this MAC address is used.
4259c609719bSwdenk
4260c609719bSwdenko If both the SROM and the environment contain a MAC address, and the
4261c609719bSwdenk  addresses differ, the value from the environment is used and a
4262c609719bSwdenk  warning is printed.
4263c609719bSwdenk
4264c609719bSwdenko If neither SROM nor the environment contain a MAC address, an error
4265c609719bSwdenk  is raised.
4266c609719bSwdenk
4267ecee9324SBen WarrenIf Ethernet drivers implement the 'write_hwaddr' function, valid MAC addresses
4268ecee9324SBen Warrenwill be programmed into hardware as part of the initialization process.	 This
4269ecee9324SBen Warrenmay be skipped by setting the appropriate 'ethmacskip' environment variable.
4270ecee9324SBen WarrenThe naming convention is as follows:
4271ecee9324SBen Warren"ethmacskip" (=>eth0), "eth1macskip" (=>eth1) etc.
4272c609719bSwdenk
4273c609719bSwdenkImage Formats:
4274c609719bSwdenk==============
4275c609719bSwdenk
42763310c549SMarian BalakowiczU-Boot is capable of booting (and performing other auxiliary operations on)
42773310c549SMarian Balakowiczimages in two formats:
42783310c549SMarian Balakowicz
42793310c549SMarian BalakowiczNew uImage format (FIT)
42803310c549SMarian Balakowicz-----------------------
42813310c549SMarian Balakowicz
42823310c549SMarian BalakowiczFlexible and powerful format based on Flattened Image Tree -- FIT (similar
42833310c549SMarian Balakowiczto Flattened Device Tree). It allows the use of images with multiple
42843310c549SMarian Balakowiczcomponents (several kernels, ramdisks, etc.), with contents protected by
42853310c549SMarian BalakowiczSHA1, MD5 or CRC32. More details are found in the doc/uImage.FIT directory.
42863310c549SMarian Balakowicz
42873310c549SMarian Balakowicz
42883310c549SMarian BalakowiczOld uImage format
42893310c549SMarian Balakowicz-----------------
42903310c549SMarian Balakowicz
42913310c549SMarian BalakowiczOld image format is based on binary files which can be basically anything,
42923310c549SMarian Balakowiczpreceded by a special header; see the definitions in include/image.h for
42933310c549SMarian Balakowiczdetails; basically, the header defines the following image properties:
4294c609719bSwdenk
4295c609719bSwdenk* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD,
4296c609719bSwdenk  4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks,
4297f5ed9e39SPeter Tyser  LynxOS, pSOS, QNX, RTEMS, INTEGRITY;
4298f5ed9e39SPeter Tyser  Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, LynxOS,
4299f5ed9e39SPeter Tyser  INTEGRITY).
43007b64fef3SWolfgang Denk* Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86,
4301afc1ce82SMacpaul Lin  IA64, MIPS, NDS32, Nios II, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit;
4302afc1ce82SMacpaul Lin  Currently supported: ARM, AVR32, Intel x86, MIPS, NDS32, Nios II, PowerPC).
4303c29fdfc1Swdenk* Compression Type (uncompressed, gzip, bzip2)
4304c609719bSwdenk* Load Address
4305c609719bSwdenk* Entry Point
4306c609719bSwdenk* Image Name
4307c609719bSwdenk* Image Timestamp
4308c609719bSwdenk
4309c609719bSwdenkThe header is marked by a special Magic Number, and both the header
4310c609719bSwdenkand the data portions of the image are secured against corruption by
4311c609719bSwdenkCRC32 checksums.
4312c609719bSwdenk
4313c609719bSwdenk
4314c609719bSwdenkLinux Support:
4315c609719bSwdenk==============
4316c609719bSwdenk
4317c609719bSwdenkAlthough U-Boot should support any OS or standalone application
43187152b1d0Swdenkeasily, the main focus has always been on Linux during the design of
4319c609719bSwdenkU-Boot.
4320c609719bSwdenk
4321c609719bSwdenkU-Boot includes many features that so far have been part of some
4322c609719bSwdenkspecial "boot loader" code within the Linux kernel. Also, any
4323c609719bSwdenk"initrd" images to be used are no longer part of one big Linux image;
4324c609719bSwdenkinstead, kernel and "initrd" are separate images. This implementation
43257152b1d0Swdenkserves several purposes:
4326c609719bSwdenk
4327c609719bSwdenk- the same features can be used for other OS or standalone
4328c609719bSwdenk  applications (for instance: using compressed images to reduce the
4329c609719bSwdenk  Flash memory footprint)
4330c609719bSwdenk
4331c609719bSwdenk- it becomes much easier to port new Linux kernel versions because
43327152b1d0Swdenk  lots of low-level, hardware dependent stuff are done by U-Boot
4333c609719bSwdenk
4334c609719bSwdenk- the same Linux kernel image can now be used with different "initrd"
4335c609719bSwdenk  images; of course this also means that different kernel images can
4336c609719bSwdenk  be run with the same "initrd". This makes testing easier (you don't
4337c609719bSwdenk  have to build a new "zImage.initrd" Linux image when you just
4338c609719bSwdenk  change a file in your "initrd"). Also, a field-upgrade of the
4339c609719bSwdenk  software is easier now.
4340c609719bSwdenk
4341c609719bSwdenk
4342c609719bSwdenkLinux HOWTO:
4343c609719bSwdenk============
4344c609719bSwdenk
4345c609719bSwdenkPorting Linux to U-Boot based systems:
4346c609719bSwdenk---------------------------------------
4347c609719bSwdenk
4348c609719bSwdenkU-Boot cannot save you from doing all the necessary modifications to
4349c609719bSwdenkconfigure the Linux device drivers for use with your target hardware
4350c609719bSwdenk(no, we don't intend to provide a full virtual machine interface to
4351c609719bSwdenkLinux :-).
4352c609719bSwdenk
4353a47a12beSStefan RoeseBut now you can ignore ALL boot loader code (in arch/powerpc/mbxboot).
4354c609719bSwdenk
4355c609719bSwdenkJust make sure your machine specific header file (for instance
4356c609719bSwdenkinclude/asm-ppc/tqm8xx.h) includes the same definition of the Board
43571dc30693SMarkus HeidelbergInformation structure as we define in include/asm-<arch>/u-boot.h,
43581dc30693SMarkus Heidelbergand make sure that your definition of IMAP_ADDR uses the same value
43596d0f6bcfSJean-Christophe PLAGNIOL-VILLARDas your U-Boot configuration in CONFIG_SYS_IMMR.
4360c609719bSwdenk
4361c609719bSwdenk
4362c609719bSwdenkConfiguring the Linux kernel:
4363c609719bSwdenk-----------------------------
4364c609719bSwdenk
4365c609719bSwdenkNo specific requirements for U-Boot. Make sure you have some root
4366c609719bSwdenkdevice (initial ramdisk, NFS) for your target system.
4367c609719bSwdenk
4368c609719bSwdenk
4369c609719bSwdenkBuilding a Linux Image:
4370c609719bSwdenk-----------------------
4371c609719bSwdenk
437224ee89b9SwdenkWith U-Boot, "normal" build targets like "zImage" or "bzImage" are
437324ee89b9Swdenknot used. If you use recent kernel source, a new build target
437424ee89b9Swdenk"uImage" will exist which automatically builds an image usable by
437524ee89b9SwdenkU-Boot. Most older kernels also have support for a "pImage" target,
437624ee89b9Swdenkwhich was introduced for our predecessor project PPCBoot and uses a
437724ee89b9Swdenk100% compatible format.
4378c609719bSwdenk
4379c609719bSwdenkExample:
4380c609719bSwdenk
4381c609719bSwdenk	make TQM850L_config
4382c609719bSwdenk	make oldconfig
4383c609719bSwdenk	make dep
438424ee89b9Swdenk	make uImage
4385c609719bSwdenk
438624ee89b9SwdenkThe "uImage" build target uses a special tool (in 'tools/mkimage') to
438724ee89b9Swdenkencapsulate a compressed Linux kernel image with header	 information,
438824ee89b9SwdenkCRC32 checksum etc. for use with U-Boot. This is what we are doing:
4389c609719bSwdenk
439024ee89b9Swdenk* build a standard "vmlinux" kernel image (in ELF binary format):
439124ee89b9Swdenk
439224ee89b9Swdenk* convert the kernel into a raw binary image:
439324ee89b9Swdenk
439424ee89b9Swdenk	${CROSS_COMPILE}-objcopy -O binary \
439524ee89b9Swdenk				 -R .note -R .comment \
439624ee89b9Swdenk				 -S vmlinux linux.bin
439724ee89b9Swdenk
439824ee89b9Swdenk* compress the binary image:
439924ee89b9Swdenk
440024ee89b9Swdenk	gzip -9 linux.bin
440124ee89b9Swdenk
440224ee89b9Swdenk* package compressed binary image for U-Boot:
440324ee89b9Swdenk
440424ee89b9Swdenk	mkimage -A ppc -O linux -T kernel -C gzip \
440524ee89b9Swdenk		-a 0 -e 0 -n "Linux Kernel Image" \
440624ee89b9Swdenk		-d linux.bin.gz uImage
440724ee89b9Swdenk
440824ee89b9Swdenk
440924ee89b9SwdenkThe "mkimage" tool can also be used to create ramdisk images for use
441024ee89b9Swdenkwith U-Boot, either separated from the Linux kernel image, or
441124ee89b9Swdenkcombined into one file. "mkimage" encapsulates the images with a 64
441224ee89b9Swdenkbyte header containing information about target architecture,
441324ee89b9Swdenkoperating system, image type, compression method, entry points, time
441424ee89b9Swdenkstamp, CRC32 checksums, etc.
441524ee89b9Swdenk
441624ee89b9Swdenk"mkimage" can be called in two ways: to verify existing images and
441724ee89b9Swdenkprint the header information, or to build new images.
4418c609719bSwdenk
4419c609719bSwdenkIn the first form (with "-l" option) mkimage lists the information
4420c609719bSwdenkcontained in the header of an existing U-Boot image; this includes
4421c609719bSwdenkchecksum verification:
4422c609719bSwdenk
4423c609719bSwdenk	tools/mkimage -l image
4424c609719bSwdenk	  -l ==> list image header information
4425c609719bSwdenk
4426c609719bSwdenkThe second form (with "-d" option) is used to build a U-Boot image
4427c609719bSwdenkfrom a "data file" which is used as image payload:
4428c609719bSwdenk
4429c609719bSwdenk	tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \
4430c609719bSwdenk		      -n name -d data_file image
4431c609719bSwdenk	  -A ==> set architecture to 'arch'
4432c609719bSwdenk	  -O ==> set operating system to 'os'
4433c609719bSwdenk	  -T ==> set image type to 'type'
4434c609719bSwdenk	  -C ==> set compression type 'comp'
4435c609719bSwdenk	  -a ==> set load address to 'addr' (hex)
4436c609719bSwdenk	  -e ==> set entry point to 'ep' (hex)
4437c609719bSwdenk	  -n ==> set image name to 'name'
4438c609719bSwdenk	  -d ==> use image data from 'datafile'
4439c609719bSwdenk
444069459791SwdenkRight now, all Linux kernels for PowerPC systems use the same load
444169459791Swdenkaddress (0x00000000), but the entry point address depends on the
444269459791Swdenkkernel version:
4443c609719bSwdenk
4444c609719bSwdenk- 2.2.x kernels have the entry point at 0x0000000C,
444524ee89b9Swdenk- 2.3.x and later kernels have the entry point at 0x00000000.
4446c609719bSwdenk
4447c609719bSwdenkSo a typical call to build a U-Boot image would read:
4448c609719bSwdenk
444924ee89b9Swdenk	-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
445024ee89b9Swdenk	> -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \
4451a47a12beSStefan Roese	> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz \
445224ee89b9Swdenk	> examples/uImage.TQM850L
445324ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
4454c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
4455c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (gzip compressed)
4456c609719bSwdenk	Data Size:    335725 Bytes = 327.86 kB = 0.32 MB
4457c609719bSwdenk	Load Address: 0x00000000
445824ee89b9Swdenk	Entry Point:  0x00000000
4459c609719bSwdenk
4460c609719bSwdenkTo verify the contents of the image (or check for corruption):
4461c609719bSwdenk
446224ee89b9Swdenk	-> tools/mkimage -l examples/uImage.TQM850L
446324ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
4464c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
4465c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (gzip compressed)
4466c609719bSwdenk	Data Size:    335725 Bytes = 327.86 kB = 0.32 MB
4467c609719bSwdenk	Load Address: 0x00000000
446824ee89b9Swdenk	Entry Point:  0x00000000
4469c609719bSwdenk
4470c609719bSwdenkNOTE: for embedded systems where boot time is critical you can trade
4471c609719bSwdenkspeed for memory and install an UNCOMPRESSED image instead: this
4472c609719bSwdenkneeds more space in Flash, but boots much faster since it does not
4473c609719bSwdenkneed to be uncompressed:
4474c609719bSwdenk
4475a47a12beSStefan Roese	-> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz
447624ee89b9Swdenk	-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
447724ee89b9Swdenk	> -A ppc -O linux -T kernel -C none -a 0 -e 0 \
4478a47a12beSStefan Roese	> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux \
447924ee89b9Swdenk	> examples/uImage.TQM850L-uncompressed
448024ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
4481c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
4482c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (uncompressed)
4483c609719bSwdenk	Data Size:    792160 Bytes = 773.59 kB = 0.76 MB
4484c609719bSwdenk	Load Address: 0x00000000
448524ee89b9Swdenk	Entry Point:  0x00000000
4486c609719bSwdenk
4487c609719bSwdenk
4488c609719bSwdenkSimilar you can build U-Boot images from a 'ramdisk.image.gz' file
4489c609719bSwdenkwhen your kernel is intended to use an initial ramdisk:
4490c609719bSwdenk
4491c609719bSwdenk	-> tools/mkimage -n 'Simple Ramdisk Image' \
4492c609719bSwdenk	> -A ppc -O linux -T ramdisk -C gzip \
4493c609719bSwdenk	> -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd
4494c609719bSwdenk	Image Name:   Simple Ramdisk Image
4495c609719bSwdenk	Created:      Wed Jan 12 14:01:50 2000
4496c609719bSwdenk	Image Type:   PowerPC Linux RAMDisk Image (gzip compressed)
4497c609719bSwdenk	Data Size:    566530 Bytes = 553.25 kB = 0.54 MB
4498c609719bSwdenk	Load Address: 0x00000000
4499c609719bSwdenk	Entry Point:  0x00000000
4500c609719bSwdenk
4501c609719bSwdenk
4502c609719bSwdenkInstalling a Linux Image:
4503c609719bSwdenk-------------------------
4504c609719bSwdenk
4505c609719bSwdenkTo downloading a U-Boot image over the serial (console) interface,
4506c609719bSwdenkyou must convert the image to S-Record format:
4507c609719bSwdenk
4508c609719bSwdenk	objcopy -I binary -O srec examples/image examples/image.srec
4509c609719bSwdenk
4510c609719bSwdenkThe 'objcopy' does not understand the information in the U-Boot
4511c609719bSwdenkimage header, so the resulting S-Record file will be relative to
4512c609719bSwdenkaddress 0x00000000. To load it to a given address, you need to
4513c609719bSwdenkspecify the target address as 'offset' parameter with the 'loads'
4514c609719bSwdenkcommand.
4515c609719bSwdenk
4516c609719bSwdenkExample: install the image to address 0x40100000 (which on the
4517c609719bSwdenkTQM8xxL is in the first Flash bank):
4518c609719bSwdenk
4519c609719bSwdenk	=> erase 40100000 401FFFFF
4520c609719bSwdenk
4521c609719bSwdenk	.......... done
4522c609719bSwdenk	Erased 8 sectors
4523c609719bSwdenk
4524c609719bSwdenk	=> loads 40100000
4525c609719bSwdenk	## Ready for S-Record download ...
4526c609719bSwdenk	~>examples/image.srec
4527c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 12 13 ...
4528c609719bSwdenk	...
4529c609719bSwdenk	15989 15990 15991 15992
4530c609719bSwdenk	[file transfer complete]
4531c609719bSwdenk	[connected]
4532c609719bSwdenk	## Start Addr = 0x00000000
4533c609719bSwdenk
4534c609719bSwdenk
4535c609719bSwdenkYou can check the success of the download using the 'iminfo' command;
4536c609719bSwdenkthis includes a checksum verification so you can be sure no data
4537c609719bSwdenkcorruption happened:
4538c609719bSwdenk
4539c609719bSwdenk	=> imi 40100000
4540c609719bSwdenk
4541c609719bSwdenk	## Checking Image at 40100000 ...
4542c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
4543c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
4544c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
4545c609719bSwdenk	   Load Address: 00000000
4546c609719bSwdenk	   Entry Point:	 0000000c
4547c609719bSwdenk	   Verifying Checksum ... OK
4548c609719bSwdenk
4549c609719bSwdenk
4550c609719bSwdenkBoot Linux:
4551c609719bSwdenk-----------
4552c609719bSwdenk
4553c609719bSwdenkThe "bootm" command is used to boot an application that is stored in
4554c609719bSwdenkmemory (RAM or Flash). In case of a Linux kernel image, the contents
4555c609719bSwdenkof the "bootargs" environment variable is passed to the kernel as
4556c609719bSwdenkparameters. You can check and modify this variable using the
4557c609719bSwdenk"printenv" and "setenv" commands:
4558c609719bSwdenk
4559c609719bSwdenk
4560c609719bSwdenk	=> printenv bootargs
4561c609719bSwdenk	bootargs=root=/dev/ram
4562c609719bSwdenk
4563c609719bSwdenk	=> setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
4564c609719bSwdenk
4565c609719bSwdenk	=> printenv bootargs
4566c609719bSwdenk	bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
4567c609719bSwdenk
4568c609719bSwdenk	=> bootm 40020000
4569c609719bSwdenk	## Booting Linux kernel at 40020000 ...
4570c609719bSwdenk	   Image Name:	 2.2.13 for NFS on TQM850L
4571c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
4572c609719bSwdenk	   Data Size:	 381681 Bytes = 372 kB = 0 MB
4573c609719bSwdenk	   Load Address: 00000000
4574c609719bSwdenk	   Entry Point:	 0000000c
4575c609719bSwdenk	   Verifying Checksum ... OK
4576c609719bSwdenk	   Uncompressing Kernel Image ... OK
4577c609719bSwdenk	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
4578c609719bSwdenk	Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
4579c609719bSwdenk	time_init: decrementer frequency = 187500000/60
4580c609719bSwdenk	Calibrating delay loop... 49.77 BogoMIPS
4581c609719bSwdenk	Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000]
4582c609719bSwdenk	...
4583c609719bSwdenk
458411ccc33fSMarcel ZiswilerIf you want to boot a Linux kernel with initial RAM disk, you pass
45857152b1d0Swdenkthe memory addresses of both the kernel and the initrd image (PPBCOOT
4586c609719bSwdenkformat!) to the "bootm" command:
4587c609719bSwdenk
4588c609719bSwdenk	=> imi 40100000 40200000
4589c609719bSwdenk
4590c609719bSwdenk	## Checking Image at 40100000 ...
4591c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
4592c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
4593c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
4594c609719bSwdenk	   Load Address: 00000000
4595c609719bSwdenk	   Entry Point:	 0000000c
4596c609719bSwdenk	   Verifying Checksum ... OK
4597c609719bSwdenk
4598c609719bSwdenk	## Checking Image at 40200000 ...
4599c609719bSwdenk	   Image Name:	 Simple Ramdisk Image
4600c609719bSwdenk	   Image Type:	 PowerPC Linux RAMDisk Image (gzip compressed)
4601c609719bSwdenk	   Data Size:	 566530 Bytes = 553 kB = 0 MB
4602c609719bSwdenk	   Load Address: 00000000
4603c609719bSwdenk	   Entry Point:	 00000000
4604c609719bSwdenk	   Verifying Checksum ... OK
4605c609719bSwdenk
4606c609719bSwdenk	=> bootm 40100000 40200000
4607c609719bSwdenk	## Booting Linux kernel at 40100000 ...
4608c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
4609c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
4610c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
4611c609719bSwdenk	   Load Address: 00000000
4612c609719bSwdenk	   Entry Point:	 0000000c
4613c609719bSwdenk	   Verifying Checksum ... OK
4614c609719bSwdenk	   Uncompressing Kernel Image ... OK
4615c609719bSwdenk	## Loading RAMDisk Image at 40200000 ...
4616c609719bSwdenk	   Image Name:	 Simple Ramdisk Image
4617c609719bSwdenk	   Image Type:	 PowerPC Linux RAMDisk Image (gzip compressed)
4618c609719bSwdenk	   Data Size:	 566530 Bytes = 553 kB = 0 MB
4619c609719bSwdenk	   Load Address: 00000000
4620c609719bSwdenk	   Entry Point:	 00000000
4621c609719bSwdenk	   Verifying Checksum ... OK
4622c609719bSwdenk	   Loading Ramdisk ... OK
4623c609719bSwdenk	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
4624c609719bSwdenk	Boot arguments: root=/dev/ram
4625c609719bSwdenk	time_init: decrementer frequency = 187500000/60
4626c609719bSwdenk	Calibrating delay loop... 49.77 BogoMIPS
4627c609719bSwdenk	...
4628c609719bSwdenk	RAMDISK: Compressed image found at block 0
4629c609719bSwdenk	VFS: Mounted root (ext2 filesystem).
4630c609719bSwdenk
4631c609719bSwdenk	bash#
4632c609719bSwdenk
46330267768eSMatthew McClintockBoot Linux and pass a flat device tree:
46340267768eSMatthew McClintock-----------
46350267768eSMatthew McClintock
46360267768eSMatthew McClintockFirst, U-Boot must be compiled with the appropriate defines. See the section
46370267768eSMatthew McClintocktitled "Linux Kernel Interface" above for a more in depth explanation. The
46380267768eSMatthew McClintockfollowing is an example of how to start a kernel and pass an updated
46390267768eSMatthew McClintockflat device tree:
46400267768eSMatthew McClintock
46410267768eSMatthew McClintock=> print oftaddr
46420267768eSMatthew McClintockoftaddr=0x300000
46430267768eSMatthew McClintock=> print oft
46440267768eSMatthew McClintockoft=oftrees/mpc8540ads.dtb
46450267768eSMatthew McClintock=> tftp $oftaddr $oft
46460267768eSMatthew McClintockSpeed: 1000, full duplex
46470267768eSMatthew McClintockUsing TSEC0 device
46480267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.101
46490267768eSMatthew McClintockFilename 'oftrees/mpc8540ads.dtb'.
46500267768eSMatthew McClintockLoad address: 0x300000
46510267768eSMatthew McClintockLoading: #
46520267768eSMatthew McClintockdone
46530267768eSMatthew McClintockBytes transferred = 4106 (100a hex)
46540267768eSMatthew McClintock=> tftp $loadaddr $bootfile
46550267768eSMatthew McClintockSpeed: 1000, full duplex
46560267768eSMatthew McClintockUsing TSEC0 device
46570267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.2
46580267768eSMatthew McClintockFilename 'uImage'.
46590267768eSMatthew McClintockLoad address: 0x200000
46600267768eSMatthew McClintockLoading:############
46610267768eSMatthew McClintockdone
46620267768eSMatthew McClintockBytes transferred = 1029407 (fb51f hex)
46630267768eSMatthew McClintock=> print loadaddr
46640267768eSMatthew McClintockloadaddr=200000
46650267768eSMatthew McClintock=> print oftaddr
46660267768eSMatthew McClintockoftaddr=0x300000
46670267768eSMatthew McClintock=> bootm $loadaddr - $oftaddr
46680267768eSMatthew McClintock## Booting image at 00200000 ...
46690267768eSMatthew McClintock   Image Name:	 Linux-2.6.17-dirty
46700267768eSMatthew McClintock   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
46710267768eSMatthew McClintock   Data Size:	 1029343 Bytes = 1005.2 kB
46720267768eSMatthew McClintock   Load Address: 00000000
46730267768eSMatthew McClintock   Entry Point:	 00000000
46740267768eSMatthew McClintock   Verifying Checksum ... OK
46750267768eSMatthew McClintock   Uncompressing Kernel Image ... OK
46760267768eSMatthew McClintockBooting using flat device tree at 0x300000
46770267768eSMatthew McClintockUsing MPC85xx ADS machine description
46780267768eSMatthew McClintockMemory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb
46790267768eSMatthew McClintock[snip]
46800267768eSMatthew McClintock
46810267768eSMatthew McClintock
46826069ff26SwdenkMore About U-Boot Image Types:
46836069ff26Swdenk------------------------------
46846069ff26Swdenk
46856069ff26SwdenkU-Boot supports the following image types:
46866069ff26Swdenk
46876069ff26Swdenk   "Standalone Programs" are directly runnable in the environment
46886069ff26Swdenk	provided by U-Boot; it is expected that (if they behave
46896069ff26Swdenk	well) you can continue to work in U-Boot after return from
46906069ff26Swdenk	the Standalone Program.
46916069ff26Swdenk   "OS Kernel Images" are usually images of some Embedded OS which
46926069ff26Swdenk	will take over control completely. Usually these programs
46936069ff26Swdenk	will install their own set of exception handlers, device
46946069ff26Swdenk	drivers, set up the MMU, etc. - this means, that you cannot
46956069ff26Swdenk	expect to re-enter U-Boot except by resetting the CPU.
46966069ff26Swdenk   "RAMDisk Images" are more or less just data blocks, and their
46976069ff26Swdenk	parameters (address, size) are passed to an OS kernel that is
46986069ff26Swdenk	being started.
46996069ff26Swdenk   "Multi-File Images" contain several images, typically an OS
47006069ff26Swdenk	(Linux) kernel image and one or more data images like
47016069ff26Swdenk	RAMDisks. This construct is useful for instance when you want
47026069ff26Swdenk	to boot over the network using BOOTP etc., where the boot
47036069ff26Swdenk	server provides just a single image file, but you want to get
47046069ff26Swdenk	for instance an OS kernel and a RAMDisk image.
47056069ff26Swdenk
47066069ff26Swdenk	"Multi-File Images" start with a list of image sizes, each
47076069ff26Swdenk	image size (in bytes) specified by an "uint32_t" in network
47086069ff26Swdenk	byte order. This list is terminated by an "(uint32_t)0".
47096069ff26Swdenk	Immediately after the terminating 0 follow the images, one by
47106069ff26Swdenk	one, all aligned on "uint32_t" boundaries (size rounded up to
47116069ff26Swdenk	a multiple of 4 bytes).
47126069ff26Swdenk
47136069ff26Swdenk   "Firmware Images" are binary images containing firmware (like
47146069ff26Swdenk	U-Boot or FPGA images) which usually will be programmed to
47156069ff26Swdenk	flash memory.
47166069ff26Swdenk
47176069ff26Swdenk   "Script files" are command sequences that will be executed by
47186069ff26Swdenk	U-Boot's command interpreter; this feature is especially
47196069ff26Swdenk	useful when you configure U-Boot to use a real shell (hush)
47206069ff26Swdenk	as command interpreter.
47216069ff26Swdenk
472244f074c7SMarek VasutBooting the Linux zImage:
472344f074c7SMarek Vasut-------------------------
472444f074c7SMarek Vasut
472544f074c7SMarek VasutOn some platforms, it's possible to boot Linux zImage. This is done
472644f074c7SMarek Vasutusing the "bootz" command. The syntax of "bootz" command is the same
472744f074c7SMarek Vasutas the syntax of "bootm" command.
472844f074c7SMarek Vasut
4729017e1f3fSMarek VasutNote, defining the CONFIG_SUPPORT_INITRD_RAW allows user to supply
4730017e1f3fSMarek Vasutkernel with raw initrd images. The syntax is slightly different, the
4731017e1f3fSMarek Vasutaddress of the initrd must be augmented by it's size, in the following
4732017e1f3fSMarek Vasutformat: "<initrd addres>:<initrd size>".
4733017e1f3fSMarek Vasut
4734c609719bSwdenk
4735c609719bSwdenkStandalone HOWTO:
4736c609719bSwdenk=================
4737c609719bSwdenk
4738c609719bSwdenkOne of the features of U-Boot is that you can dynamically load and
4739c609719bSwdenkrun "standalone" applications, which can use some resources of
4740c609719bSwdenkU-Boot like console I/O functions or interrupt services.
4741c609719bSwdenk
4742c609719bSwdenkTwo simple examples are included with the sources:
4743c609719bSwdenk
4744c609719bSwdenk"Hello World" Demo:
4745c609719bSwdenk-------------------
4746c609719bSwdenk
4747c609719bSwdenk'examples/hello_world.c' contains a small "Hello World" Demo
4748c609719bSwdenkapplication; it is automatically compiled when you build U-Boot.
4749c609719bSwdenkIt's configured to run at address 0x00040004, so you can play with it
4750c609719bSwdenklike that:
4751c609719bSwdenk
4752c609719bSwdenk	=> loads
4753c609719bSwdenk	## Ready for S-Record download ...
4754c609719bSwdenk	~>examples/hello_world.srec
4755c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 ...
4756c609719bSwdenk	[file transfer complete]
4757c609719bSwdenk	[connected]
4758c609719bSwdenk	## Start Addr = 0x00040004
4759c609719bSwdenk
4760c609719bSwdenk	=> go 40004 Hello World! This is a test.
4761c609719bSwdenk	## Starting application at 0x00040004 ...
4762c609719bSwdenk	Hello World
4763c609719bSwdenk	argc = 7
4764c609719bSwdenk	argv[0] = "40004"
4765c609719bSwdenk	argv[1] = "Hello"
4766c609719bSwdenk	argv[2] = "World!"
4767c609719bSwdenk	argv[3] = "This"
4768c609719bSwdenk	argv[4] = "is"
4769c609719bSwdenk	argv[5] = "a"
4770c609719bSwdenk	argv[6] = "test."
4771c609719bSwdenk	argv[7] = "<NULL>"
4772c609719bSwdenk	Hit any key to exit ...
4773c609719bSwdenk
4774c609719bSwdenk	## Application terminated, rc = 0x0
4775c609719bSwdenk
4776c609719bSwdenkAnother example, which demonstrates how to register a CPM interrupt
4777c609719bSwdenkhandler with the U-Boot code, can be found in 'examples/timer.c'.
4778c609719bSwdenkHere, a CPM timer is set up to generate an interrupt every second.
4779c609719bSwdenkThe interrupt service routine is trivial, just printing a '.'
4780c609719bSwdenkcharacter, but this is just a demo program. The application can be
4781c609719bSwdenkcontrolled by the following keys:
4782c609719bSwdenk
4783c609719bSwdenk	? - print current values og the CPM Timer registers
4784c609719bSwdenk	b - enable interrupts and start timer
4785c609719bSwdenk	e - stop timer and disable interrupts
4786c609719bSwdenk	q - quit application
4787c609719bSwdenk
4788c609719bSwdenk	=> loads
4789c609719bSwdenk	## Ready for S-Record download ...
4790c609719bSwdenk	~>examples/timer.srec
4791c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 ...
4792c609719bSwdenk	[file transfer complete]
4793c609719bSwdenk	[connected]
4794c609719bSwdenk	## Start Addr = 0x00040004
4795c609719bSwdenk
4796c609719bSwdenk	=> go 40004
4797c609719bSwdenk	## Starting application at 0x00040004 ...
4798c609719bSwdenk	TIMERS=0xfff00980
4799c609719bSwdenk	Using timer 1
4800c609719bSwdenk	  tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0
4801c609719bSwdenk
4802c609719bSwdenkHit 'b':
4803c609719bSwdenk	[q, b, e, ?] Set interval 1000000 us
4804c609719bSwdenk	Enabling timer
4805c609719bSwdenkHit '?':
4806c609719bSwdenk	[q, b, e, ?] ........
4807c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0
4808c609719bSwdenkHit '?':
4809c609719bSwdenk	[q, b, e, ?] .
4810c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0
4811c609719bSwdenkHit '?':
4812c609719bSwdenk	[q, b, e, ?] .
4813c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0
4814c609719bSwdenkHit '?':
4815c609719bSwdenk	[q, b, e, ?] .
4816c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0
4817c609719bSwdenkHit 'e':
4818c609719bSwdenk	[q, b, e, ?] ...Stopping timer
4819c609719bSwdenkHit 'q':
4820c609719bSwdenk	[q, b, e, ?] ## Application terminated, rc = 0x0
4821c609719bSwdenk
4822c609719bSwdenk
482385ec0bccSwdenkMinicom warning:
482485ec0bccSwdenk================
482585ec0bccSwdenk
48267152b1d0SwdenkOver time, many people have reported problems when trying to use the
482785ec0bccSwdenk"minicom" terminal emulation program for serial download. I (wd)
482885ec0bccSwdenkconsider minicom to be broken, and recommend not to use it. Under
4829f07771ccSwdenkUnix, I recommend to use C-Kermit for general purpose use (and
483085ec0bccSwdenkespecially for kermit binary protocol download ("loadb" command), and
4831e53515a2SKarl O. Pincuse "cu" for S-Record download ("loads" command).  See
4832e53515a2SKarl O. Pinchttp://www.denx.de/wiki/view/DULG/SystemSetup#Section_4.3.
4833e53515a2SKarl O. Pincfor help with kermit.
4834e53515a2SKarl O. Pinc
483585ec0bccSwdenk
483652f52c14SwdenkNevertheless, if you absolutely want to use it try adding this
483752f52c14Swdenkconfiguration to your "File transfer protocols" section:
483852f52c14Swdenk
483952f52c14Swdenk	   Name	   Program			Name U/D FullScr IO-Red. Multi
484052f52c14Swdenk	X  kermit  /usr/bin/kermit -i -l %l -s	 Y    U	   Y	   N	  N
484152f52c14Swdenk	Y  kermit  /usr/bin/kermit -i -l %l -r	 N    D	   Y	   N	  N
484252f52c14Swdenk
484352f52c14Swdenk
4844c609719bSwdenkNetBSD Notes:
4845c609719bSwdenk=============
4846c609719bSwdenk
4847c609719bSwdenkStarting at version 0.9.2, U-Boot supports NetBSD both as host
4848c609719bSwdenk(build U-Boot) and target system (boots NetBSD/mpc8xx).
4849c609719bSwdenk
4850c609719bSwdenkBuilding requires a cross environment; it is known to work on
4851c609719bSwdenkNetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also
4852c609719bSwdenkneed gmake since the Makefiles are not compatible with BSD make).
4853c609719bSwdenkNote that the cross-powerpc package does not install include files;
4854c609719bSwdenkattempting to build U-Boot will fail because <machine/ansi.h> is
4855c609719bSwdenkmissing.  This file has to be installed and patched manually:
4856c609719bSwdenk
4857c609719bSwdenk	# cd /usr/pkg/cross/powerpc-netbsd/include
4858c609719bSwdenk	# mkdir powerpc
4859c609719bSwdenk	# ln -s powerpc machine
4860c609719bSwdenk	# cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h
4861c609719bSwdenk	# ${EDIT} powerpc/ansi.h	## must remove __va_list, _BSD_VA_LIST
4862c609719bSwdenk
4863c609719bSwdenkNative builds *don't* work due to incompatibilities between native
4864c609719bSwdenkand U-Boot include files.
4865c609719bSwdenk
4866c609719bSwdenkBooting assumes that (the first part of) the image booted is a
4867c609719bSwdenkstage-2 loader which in turn loads and then invokes the kernel
4868c609719bSwdenkproper. Loader sources will eventually appear in the NetBSD source
4869c609719bSwdenktree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the
48702a8af187Swdenkmeantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz
4871c609719bSwdenk
4872c609719bSwdenk
4873c609719bSwdenkImplementation Internals:
4874c609719bSwdenk=========================
4875c609719bSwdenk
4876c609719bSwdenkThe following is not intended to be a complete description of every
4877c609719bSwdenkimplementation detail. However, it should help to understand the
4878c609719bSwdenkinner workings of U-Boot and make it easier to port it to custom
4879c609719bSwdenkhardware.
4880c609719bSwdenk
4881c609719bSwdenk
4882c609719bSwdenkInitial Stack, Global Data:
4883c609719bSwdenk---------------------------
4884c609719bSwdenk
4885c609719bSwdenkThe implementation of U-Boot is complicated by the fact that U-Boot
4886c609719bSwdenkstarts running out of ROM (flash memory), usually without access to
4887c609719bSwdenksystem RAM (because the memory controller is not initialized yet).
4888c609719bSwdenkThis means that we don't have writable Data or BSS segments, and BSS
4889c609719bSwdenkis not initialized as zero. To be able to get a C environment working
4890c609719bSwdenkat all, we have to allocate at least a minimal stack. Implementation
4891c609719bSwdenkoptions for this are defined and restricted by the CPU used: Some CPU
4892c609719bSwdenkmodels provide on-chip memory (like the IMMR area on MPC8xx and
4893c609719bSwdenkMPC826x processors), on others (parts of) the data cache can be
4894c609719bSwdenklocked as (mis-) used as memory, etc.
4895c609719bSwdenk
48967152b1d0Swdenk	Chris Hallinan posted a good summary of these issues to the
48970668236bSWolfgang Denk	U-Boot mailing list:
489843d9616cSwdenk
489943d9616cSwdenk	Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)?
490043d9616cSwdenk	From: "Chris Hallinan" <clh@net1plus.com>
490143d9616cSwdenk	Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET)
490243d9616cSwdenk	...
490343d9616cSwdenk
490443d9616cSwdenk	Correct me if I'm wrong, folks, but the way I understand it
490543d9616cSwdenk	is this: Using DCACHE as initial RAM for Stack, etc, does not
490643d9616cSwdenk	require any physical RAM backing up the cache. The cleverness
490743d9616cSwdenk	is that the cache is being used as a temporary supply of
490843d9616cSwdenk	necessary storage before the SDRAM controller is setup. It's
490911ccc33fSMarcel Ziswiler	beyond the scope of this list to explain the details, but you
491043d9616cSwdenk	can see how this works by studying the cache architecture and
491143d9616cSwdenk	operation in the architecture and processor-specific manuals.
491243d9616cSwdenk
491343d9616cSwdenk	OCM is On Chip Memory, which I believe the 405GP has 4K. It
491443d9616cSwdenk	is another option for the system designer to use as an
491511ccc33fSMarcel Ziswiler	initial stack/RAM area prior to SDRAM being available. Either
491643d9616cSwdenk	option should work for you. Using CS 4 should be fine if your
491743d9616cSwdenk	board designers haven't used it for something that would
491843d9616cSwdenk	cause you grief during the initial boot! It is frequently not
491943d9616cSwdenk	used.
492043d9616cSwdenk
49216d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	CONFIG_SYS_INIT_RAM_ADDR should be somewhere that won't interfere
492243d9616cSwdenk	with your processor/board/system design. The default value
492343d9616cSwdenk	you will find in any recent u-boot distribution in
49248a316c9bSStefan Roese	walnut.h should work for you. I'd set it to a value larger
492543d9616cSwdenk	than your SDRAM module. If you have a 64MB SDRAM module, set
492643d9616cSwdenk	it above 400_0000. Just make sure your board has no resources
492743d9616cSwdenk	that are supposed to respond to that address! That code in
492843d9616cSwdenk	start.S has been around a while and should work as is when
492943d9616cSwdenk	you get the config right.
493043d9616cSwdenk
493143d9616cSwdenk	-Chris Hallinan
493243d9616cSwdenk	DS4.COM, Inc.
493343d9616cSwdenk
4934c609719bSwdenkIt is essential to remember this, since it has some impact on the C
4935c609719bSwdenkcode for the initialization procedures:
4936c609719bSwdenk
4937c609719bSwdenk* Initialized global data (data segment) is read-only. Do not attempt
4938c609719bSwdenk  to write it.
4939c609719bSwdenk
494011ccc33fSMarcel Ziswiler* Do not use any uninitialized global data (or implicitely initialized
4941c609719bSwdenk  as zero data - BSS segment) at all - this is undefined, initiali-
49427152b1d0Swdenk  zation is performed later (when relocating to RAM).
4943c609719bSwdenk
4944c609719bSwdenk* Stack space is very limited. Avoid big data buffers or things like
4945c609719bSwdenk  that.
4946c609719bSwdenk
4947c609719bSwdenkHaving only the stack as writable memory limits means we cannot use
4948c609719bSwdenknormal global data to share information beween the code. But it
4949c609719bSwdenkturned out that the implementation of U-Boot can be greatly
4950c609719bSwdenksimplified by making a global data structure (gd_t) available to all
4951c609719bSwdenkfunctions. We could pass a pointer to this data as argument to _all_
4952c609719bSwdenkfunctions, but this would bloat the code. Instead we use a feature of
4953c609719bSwdenkthe GCC compiler (Global Register Variables) to share the data: we
4954c609719bSwdenkplace a pointer (gd) to the global data into a register which we
4955c609719bSwdenkreserve for this purpose.
4956c609719bSwdenk
49577152b1d0SwdenkWhen choosing a register for such a purpose we are restricted by the
4958c609719bSwdenkrelevant  (E)ABI  specifications for the current architecture, and by
4959c609719bSwdenkGCC's implementation.
4960c609719bSwdenk
4961c609719bSwdenkFor PowerPC, the following registers have specific use:
4962c609719bSwdenk	R1:	stack pointer
4963e7670f6cSWolfgang Denk	R2:	reserved for system use
4964c609719bSwdenk	R3-R4:	parameter passing and return values
4965c609719bSwdenk	R5-R10: parameter passing
4966c609719bSwdenk	R13:	small data area pointer
4967c609719bSwdenk	R30:	GOT pointer
4968c609719bSwdenk	R31:	frame pointer
4969c609719bSwdenk
4970e6bee808SJoakim Tjernlund	(U-Boot also uses R12 as internal GOT pointer. r12
4971e6bee808SJoakim Tjernlund	is a volatile register so r12 needs to be reset when
4972e6bee808SJoakim Tjernlund	going back and forth between asm and C)
4973c609719bSwdenk
4974e7670f6cSWolfgang Denk    ==> U-Boot will use R2 to hold a pointer to the global data
4975c609719bSwdenk
4976c609719bSwdenk    Note: on PPC, we could use a static initializer (since the
4977c609719bSwdenk    address of the global data structure is known at compile time),
4978c609719bSwdenk    but it turned out that reserving a register results in somewhat
4979c609719bSwdenk    smaller code - although the code savings are not that big (on
4980c609719bSwdenk    average for all boards 752 bytes for the whole U-Boot image,
4981c609719bSwdenk    624 text + 127 data).
4982c609719bSwdenk
4983c4db335cSRobin GetzOn Blackfin, the normal C ABI (except for P3) is followed as documented here:
49844c58eb55SMike Frysinger	http://docs.blackfin.uclinux.org/doku.php?id=application_binary_interface
49854c58eb55SMike Frysinger
4986c4db335cSRobin Getz    ==> U-Boot will use P3 to hold a pointer to the global data
49874c58eb55SMike Frysinger
4988c609719bSwdenkOn ARM, the following registers are used:
4989c609719bSwdenk
4990c609719bSwdenk	R0:	function argument word/integer result
4991c609719bSwdenk	R1-R3:	function argument word
4992c609719bSwdenk	R9:	GOT pointer
4993c609719bSwdenk	R10:	stack limit (used only if stack checking if enabled)
4994c609719bSwdenk	R11:	argument (frame) pointer
4995c609719bSwdenk	R12:	temporary workspace
4996c609719bSwdenk	R13:	stack pointer
4997c609719bSwdenk	R14:	link register
4998c609719bSwdenk	R15:	program counter
4999c609719bSwdenk
5000c609719bSwdenk    ==> U-Boot will use R8 to hold a pointer to the global data
5001c609719bSwdenk
50020df01fd3SThomas ChouOn Nios II, the ABI is documented here:
50030df01fd3SThomas Chou	http://www.altera.com/literature/hb/nios2/n2cpu_nii51016.pdf
50040df01fd3SThomas Chou
50050df01fd3SThomas Chou    ==> U-Boot will use gp to hold a pointer to the global data
50060df01fd3SThomas Chou
50070df01fd3SThomas Chou    Note: on Nios II, we give "-G0" option to gcc and don't use gp
50080df01fd3SThomas Chou    to access small data sections, so gp is free.
50090df01fd3SThomas Chou
5010afc1ce82SMacpaul LinOn NDS32, the following registers are used:
5011afc1ce82SMacpaul Lin
5012afc1ce82SMacpaul Lin	R0-R1:	argument/return
5013afc1ce82SMacpaul Lin	R2-R5:	argument
5014afc1ce82SMacpaul Lin	R15:	temporary register for assembler
5015afc1ce82SMacpaul Lin	R16:	trampoline register
5016afc1ce82SMacpaul Lin	R28:	frame pointer (FP)
5017afc1ce82SMacpaul Lin	R29:	global pointer (GP)
5018afc1ce82SMacpaul Lin	R30:	link register (LP)
5019afc1ce82SMacpaul Lin	R31:	stack pointer (SP)
5020afc1ce82SMacpaul Lin	PC:	program counter (PC)
5021afc1ce82SMacpaul Lin
5022afc1ce82SMacpaul Lin    ==> U-Boot will use R10 to hold a pointer to the global data
5023afc1ce82SMacpaul Lin
5024d87080b7SWolfgang DenkNOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope,
5025d87080b7SWolfgang Denkor current versions of GCC may "optimize" the code too much.
5026c609719bSwdenk
5027c609719bSwdenkMemory Management:
5028c609719bSwdenk------------------
5029c609719bSwdenk
5030c609719bSwdenkU-Boot runs in system state and uses physical addresses, i.e. the
5031c609719bSwdenkMMU is not used either for address mapping nor for memory protection.
5032c609719bSwdenk
5033c609719bSwdenkThe available memory is mapped to fixed addresses using the memory
5034c609719bSwdenkcontroller. In this process, a contiguous block is formed for each
5035c609719bSwdenkmemory type (Flash, SDRAM, SRAM), even when it consists of several
5036c609719bSwdenkphysical memory banks.
5037c609719bSwdenk
5038c609719bSwdenkU-Boot is installed in the first 128 kB of the first Flash bank (on
5039c609719bSwdenkTQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After
5040c609719bSwdenkbooting and sizing and initializing DRAM, the code relocates itself
5041c609719bSwdenkto the upper end of DRAM. Immediately below the U-Boot code some
50426d0f6bcfSJean-Christophe PLAGNIOL-VILLARDmemory is reserved for use by malloc() [see CONFIG_SYS_MALLOC_LEN
5043c609719bSwdenkconfiguration setting]. Below that, a structure with global Board
5044c609719bSwdenkInfo data is placed, followed by the stack (growing downward).
5045c609719bSwdenk
5046c609719bSwdenkAdditionally, some exception handler code is copied to the low 8 kB
5047c609719bSwdenkof DRAM (0x00000000 ... 0x00001FFF).
5048c609719bSwdenk
5049c609719bSwdenkSo a typical memory configuration with 16 MB of DRAM could look like
5050c609719bSwdenkthis:
5051c609719bSwdenk
5052c609719bSwdenk	0x0000 0000	Exception Vector code
5053c609719bSwdenk	      :
5054c609719bSwdenk	0x0000 1FFF
5055c609719bSwdenk	0x0000 2000	Free for Application Use
5056c609719bSwdenk	      :
5057c609719bSwdenk	      :
5058c609719bSwdenk
5059c609719bSwdenk	      :
5060c609719bSwdenk	      :
5061c609719bSwdenk	0x00FB FF20	Monitor Stack (Growing downward)
5062c609719bSwdenk	0x00FB FFAC	Board Info Data and permanent copy of global data
5063c609719bSwdenk	0x00FC 0000	Malloc Arena
5064c609719bSwdenk	      :
5065c609719bSwdenk	0x00FD FFFF
5066c609719bSwdenk	0x00FE 0000	RAM Copy of Monitor Code
5067c609719bSwdenk	...		eventually: LCD or video framebuffer
5068c609719bSwdenk	...		eventually: pRAM (Protected RAM - unchanged by reset)
5069c609719bSwdenk	0x00FF FFFF	[End of RAM]
5070c609719bSwdenk
5071c609719bSwdenk
5072c609719bSwdenkSystem Initialization:
5073c609719bSwdenk----------------------
5074c609719bSwdenk
5075c609719bSwdenkIn the reset configuration, U-Boot starts at the reset entry point
507611ccc33fSMarcel Ziswiler(on most PowerPC systems at address 0x00000100). Because of the reset
5077c609719bSwdenkconfiguration for CS0# this is a mirror of the onboard Flash memory.
50787152b1d0SwdenkTo be able to re-map memory U-Boot then jumps to its link address.
5079c609719bSwdenkTo be able to implement the initialization code in C, a (small!)
5080c609719bSwdenkinitial stack is set up in the internal Dual Ported RAM (in case CPUs
5081c609719bSwdenkwhich provide such a feature like MPC8xx or MPC8260), or in a locked
5082c609719bSwdenkpart of the data cache. After that, U-Boot initializes the CPU core,
5083c609719bSwdenkthe caches and the SIU.
5084c609719bSwdenk
5085c609719bSwdenkNext, all (potentially) available memory banks are mapped using a
5086c609719bSwdenkpreliminary mapping. For example, we put them on 512 MB boundaries
5087c609719bSwdenk(multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash
5088c609719bSwdenkon 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is
5089c609719bSwdenkprogrammed for SDRAM access. Using the temporary configuration, a
5090c609719bSwdenksimple memory test is run that determines the size of the SDRAM
5091c609719bSwdenkbanks.
5092c609719bSwdenk
5093c609719bSwdenkWhen there is more than one SDRAM bank, and the banks are of
50947152b1d0Swdenkdifferent size, the largest is mapped first. For equal size, the first
5095c609719bSwdenkbank (CS2#) is mapped first. The first mapping is always for address
5096c609719bSwdenk0x00000000, with any additional banks following immediately to create
5097c609719bSwdenkcontiguous memory starting from 0.
5098c609719bSwdenk
5099c609719bSwdenkThen, the monitor installs itself at the upper end of the SDRAM area
5100c609719bSwdenkand allocates memory for use by malloc() and for the global Board
5101c609719bSwdenkInfo data; also, the exception vector code is copied to the low RAM
5102c609719bSwdenkpages, and the final stack is set up.
5103c609719bSwdenk
5104c609719bSwdenkOnly after this relocation will you have a "normal" C environment;
5105c609719bSwdenkuntil that you are restricted in several ways, mostly because you are
5106c609719bSwdenkrunning from ROM, and because the code will have to be relocated to a
5107c609719bSwdenknew address in RAM.
5108c609719bSwdenk
5109c609719bSwdenk
5110c609719bSwdenkU-Boot Porting Guide:
5111c609719bSwdenk----------------------
5112c609719bSwdenk
5113c609719bSwdenk[Based on messages by Jerry Van Baren in the U-Boot-Users mailing
51146aff3115Swdenklist, October 2002]
5115c609719bSwdenk
5116c609719bSwdenk
5117c609719bSwdenkint main(int argc, char *argv[])
5118c609719bSwdenk{
5119c609719bSwdenk	sighandler_t no_more_time;
5120c609719bSwdenk
5121c609719bSwdenk	signal(SIGALRM, no_more_time);
5122c609719bSwdenk	alarm(PROJECT_DEADLINE - toSec (3 * WEEK));
5123c609719bSwdenk
5124c609719bSwdenk	if (available_money > available_manpower) {
51256c3fef28SJerry Van Baren		Pay consultant to port U-Boot;
5126c609719bSwdenk		return 0;
5127c609719bSwdenk	}
5128c609719bSwdenk
5129c609719bSwdenk	Download latest U-Boot source;
5130c609719bSwdenk
51310668236bSWolfgang Denk	Subscribe to u-boot mailing list;
51326aff3115Swdenk
51336c3fef28SJerry Van Baren	if (clueless)
5134c609719bSwdenk		email("Hi, I am new to U-Boot, how do I get started?");
5135c609719bSwdenk
5136c609719bSwdenk	while (learning) {
5137c609719bSwdenk		Read the README file in the top level directory;
51387cb22f97Swdenk		Read http://www.denx.de/twiki/bin/view/DULG/Manual;
51396c3fef28SJerry Van Baren		Read applicable doc/*.README;
5140c609719bSwdenk		Read the source, Luke;
51416c3fef28SJerry Van Baren		/* find . -name "*.[chS]" | xargs grep -i <keyword> */
5142c609719bSwdenk	}
5143c609719bSwdenk
51446c3fef28SJerry Van Baren	if (available_money > toLocalCurrency ($2500))
51456c3fef28SJerry Van Baren		Buy a BDI3000;
51466c3fef28SJerry Van Baren	else
5147c609719bSwdenk		Add a lot of aggravation and time;
5148c609719bSwdenk
51496c3fef28SJerry Van Baren	if (a similar board exists) {	/* hopefully... */
51506c3fef28SJerry Van Baren		cp -a board/<similar> board/<myboard>
51516c3fef28SJerry Van Baren		cp include/configs/<similar>.h include/configs/<myboard>.h
51526c3fef28SJerry Van Baren	} else {
5153c609719bSwdenk		Create your own board support subdirectory;
51546c3fef28SJerry Van Baren		Create your own board include/configs/<myboard>.h file;
51556c3fef28SJerry Van Baren	}
51566c3fef28SJerry Van Baren	Edit new board/<myboard> files
51576c3fef28SJerry Van Baren	Edit new include/configs/<myboard>.h
5158c609719bSwdenk
51596c3fef28SJerry Van Baren	while (!accepted) {
5160c609719bSwdenk		while (!running) {
5161c609719bSwdenk			do {
5162c609719bSwdenk				Add / modify source code;
5163c609719bSwdenk			} until (compiles);
5164c609719bSwdenk			Debug;
5165c609719bSwdenk			if (clueless)
5166c609719bSwdenk				email("Hi, I am having problems...");
5167c609719bSwdenk		}
51686c3fef28SJerry Van Baren		Send patch file to the U-Boot email list;
51696c3fef28SJerry Van Baren		if (reasonable critiques)
51706c3fef28SJerry Van Baren			Incorporate improvements from email list code review;
51716c3fef28SJerry Van Baren		else
51726c3fef28SJerry Van Baren			Defend code as written;
51736c3fef28SJerry Van Baren	}
5174c609719bSwdenk
5175c609719bSwdenk	return 0;
5176c609719bSwdenk}
5177c609719bSwdenk
5178c609719bSwdenkvoid no_more_time (int sig)
5179c609719bSwdenk{
5180c609719bSwdenk      hire_a_guru();
5181c609719bSwdenk}
5182c609719bSwdenk
5183c609719bSwdenk
5184c609719bSwdenkCoding Standards:
5185c609719bSwdenk-----------------
5186c609719bSwdenk
5187c609719bSwdenkAll contributions to U-Boot should conform to the Linux kernel
51882c051651SDetlev Zundelcoding style; see the file "Documentation/CodingStyle" and the script
51897ca9296eSWolfgang Denk"scripts/Lindent" in your Linux kernel source directory.
5190c609719bSwdenk
51912c051651SDetlev ZundelSource files originating from a different project (for example the
51922c051651SDetlev ZundelMTD subsystem) are generally exempt from these guidelines and are not
51932c051651SDetlev Zundelreformated to ease subsequent migration to newer versions of those
51942c051651SDetlev Zundelsources.
51952c051651SDetlev Zundel
51962c051651SDetlev ZundelPlease note that U-Boot is implemented in C (and to some small parts in
51972c051651SDetlev ZundelAssembler); no C++ is used, so please do not use C++ style comments (//)
51982c051651SDetlev Zundelin your code.
5199c609719bSwdenk
5200c178d3daSwdenkPlease also stick to the following formatting rules:
5201180d3f74Swdenk- remove any trailing white space
52027ca9296eSWolfgang Denk- use TAB characters for indentation and vertical alignment, not spaces
5203180d3f74Swdenk- make sure NOT to use DOS '\r\n' line feeds
52047ca9296eSWolfgang Denk- do not add more than 2 consecutive empty lines to source files
5205180d3f74Swdenk- do not add trailing empty lines to source files
5206180d3f74Swdenk
5207c609719bSwdenkSubmissions which do not conform to the standards may be returned
5208c609719bSwdenkwith a request to reformat the changes.
5209c609719bSwdenk
5210c609719bSwdenk
5211c609719bSwdenkSubmitting Patches:
5212c609719bSwdenk-------------------
5213c609719bSwdenk
5214c609719bSwdenkSince the number of patches for U-Boot is growing, we need to
5215c609719bSwdenkestablish some rules. Submissions which do not conform to these rules
5216c609719bSwdenkmay be rejected, even when they contain important and valuable stuff.
5217c609719bSwdenk
52180d28f34bSMagnus LiljaPlease see http://www.denx.de/wiki/U-Boot/Patches for details.
5219218ca724SWolfgang Denk
52200668236bSWolfgang DenkPatches shall be sent to the u-boot mailing list <u-boot@lists.denx.de>;
52210668236bSWolfgang Denksee http://lists.denx.de/mailman/listinfo/u-boot
52220668236bSWolfgang Denk
5223c609719bSwdenkWhen you send a patch, please include the following information with
5224c609719bSwdenkit:
5225c609719bSwdenk
5226c609719bSwdenk* For bug fixes: a description of the bug and how your patch fixes
5227c609719bSwdenk  this bug. Please try to include a way of demonstrating that the
5228c609719bSwdenk  patch actually fixes something.
5229c609719bSwdenk
5230c609719bSwdenk* For new features: a description of the feature and your
5231c609719bSwdenk  implementation.
5232c609719bSwdenk
5233c609719bSwdenk* A CHANGELOG entry as plaintext (separate from the patch)
5234c609719bSwdenk
5235c609719bSwdenk* For major contributions, your entry to the CREDITS file
5236c609719bSwdenk
5237c609719bSwdenk* When you add support for a new board, don't forget to add this
52387ca9296eSWolfgang Denk  board to the MAINTAINERS file, too.
5239c609719bSwdenk
5240c609719bSwdenk* If your patch adds new configuration options, don't forget to
5241c609719bSwdenk  document these in the README file.
5242c609719bSwdenk
5243218ca724SWolfgang Denk* The patch itself. If you are using git (which is *strongly*
5244218ca724SWolfgang Denk  recommended) you can easily generate the patch using the
52457ca9296eSWolfgang Denk  "git format-patch". If you then use "git send-email" to send it to
5246218ca724SWolfgang Denk  the U-Boot mailing list, you will avoid most of the common problems
5247218ca724SWolfgang Denk  with some other mail clients.
5248c609719bSwdenk
5249218ca724SWolfgang Denk  If you cannot use git, use "diff -purN OLD NEW". If your version of
5250218ca724SWolfgang Denk  diff does not support these options, then get the latest version of
5251218ca724SWolfgang Denk  GNU diff.
52526dff5529Swdenk
5253218ca724SWolfgang Denk  The current directory when running this command shall be the parent
5254218ca724SWolfgang Denk  directory of the U-Boot source tree (i. e. please make sure that
5255218ca724SWolfgang Denk  your patch includes sufficient directory information for the
5256218ca724SWolfgang Denk  affected files).
5257218ca724SWolfgang Denk
5258218ca724SWolfgang Denk  We prefer patches as plain text. MIME attachments are discouraged,
5259218ca724SWolfgang Denk  and compressed attachments must not be used.
5260c609719bSwdenk
526152f52c14Swdenk* If one logical set of modifications affects or creates several
526252f52c14Swdenk  files, all these changes shall be submitted in a SINGLE patch file.
526352f52c14Swdenk
526452f52c14Swdenk* Changesets that contain different, unrelated modifications shall be
526552f52c14Swdenk  submitted as SEPARATE patches, one patch per changeset.
526652f52c14Swdenk
526752f52c14Swdenk
5268c609719bSwdenkNotes:
5269c609719bSwdenk
5270c609719bSwdenk* Before sending the patch, run the MAKEALL script on your patched
5271c609719bSwdenk  source tree and make sure that no errors or warnings are reported
5272c609719bSwdenk  for any of the boards.
5273c609719bSwdenk
5274c609719bSwdenk* Keep your modifications to the necessary minimum: A patch
5275c609719bSwdenk  containing several unrelated changes or arbitrary reformats will be
5276c609719bSwdenk  returned with a request to re-formatting / split it.
5277c609719bSwdenk
5278c609719bSwdenk* If you modify existing code, make sure that your new code does not
5279c609719bSwdenk  add to the memory footprint of the code ;-) Small is beautiful!
5280c609719bSwdenk  When adding new features, these should compile conditionally only
5281c609719bSwdenk  (using #ifdef), and the resulting code with the new feature
5282c609719bSwdenk  disabled must not need more memory than the old code without your
5283c609719bSwdenk  modification.
528490dc6704Swdenk
52850668236bSWolfgang Denk* Remember that there is a size limit of 100 kB per message on the
52860668236bSWolfgang Denk  u-boot mailing list. Bigger patches will be moderated. If they are
52870668236bSWolfgang Denk  reasonable and not too big, they will be acknowledged. But patches
52880668236bSWolfgang Denk  bigger than the size limit should be avoided.
5289