xref: /openbmc/u-boot/README (revision 5da627a424b3ad2d38a81886ba4a18e5123a6788)
1c609719bSwdenk#
2c609719bSwdenk# (C) Copyright 2000 - 2002
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
2824ee89b9SwdenkEmbedded boards based on PowerPC and ARM processors, which can be
2924ee89b9Swdenkinstalled in a boot ROM and used to initialize and test the hardware
3024ee89b9Swdenkor to download and run application code.
31c609719bSwdenk
32c609719bSwdenkThe development of U-Boot is closely related to Linux: some parts of
3324ee89b9Swdenkthe source code originate in the Linux source tree, we have some
3424ee89b9Swdenkheader files in common, and special provision has been made to
35c609719bSwdenksupport booting of Linux images.
36c609719bSwdenk
37c609719bSwdenkSome attention has been paid to make this software easily
38c609719bSwdenkconfigurable and extendable. For instance, all monitor commands are
39c609719bSwdenkimplemented with the same call interface, so that it's very easy to
40c609719bSwdenkadd new commands. Also, instead of permanently adding rarely used
41c609719bSwdenkcode (for instance hardware test utilities) to the monitor, you can
42c609719bSwdenkload and run it dynamically.
43c609719bSwdenk
44c609719bSwdenk
45c609719bSwdenkStatus:
46c609719bSwdenk=======
47c609719bSwdenk
48c609719bSwdenkIn general, all boards for which a configuration option exists in the
49c609719bSwdenkMakefile have been tested to some extent and can be considered
50c609719bSwdenk"working". In fact, many of them are used in production systems.
51c609719bSwdenk
52c609719bSwdenkIn case of problems see the CHANGELOG and CREDITS files to find out
53c609719bSwdenkwho contributed the specific port.
54c609719bSwdenk
55c609719bSwdenk
56c609719bSwdenkWhere to get help:
57c609719bSwdenk==================
58c609719bSwdenk
59c609719bSwdenkIn case you have questions about, problems with or contributions for
60c609719bSwdenkU-Boot you should send a message to the U-Boot mailing list at
61c609719bSwdenk<u-boot-users@lists.sourceforge.net>. There is also an archive of
62c609719bSwdenkprevious traffic on the mailing list - please search the archive
63c609719bSwdenkbefore asking FAQ's. Please see
64c609719bSwdenkhttp://lists.sourceforge.net/lists/listinfo/u-boot-users/
65c609719bSwdenk
66c609719bSwdenk
67c609719bSwdenkWhere we come from:
68c609719bSwdenk===================
69c609719bSwdenk
70c609719bSwdenk- start from 8xxrom sources
7124ee89b9Swdenk- create PPCBoot project (http://sourceforge.net/projects/ppcboot)
72c609719bSwdenk- clean up code
73c609719bSwdenk- make it easier to add custom boards
74c609719bSwdenk- make it possible to add other [PowerPC] CPUs
75c609719bSwdenk- extend functions, especially:
76c609719bSwdenk  * Provide extended interface to Linux boot loader
77c609719bSwdenk  * S-Record download
78c609719bSwdenk  * network boot
79c609719bSwdenk  * PCMCIA / CompactFLash / ATA disk / SCSI ... boot
8024ee89b9Swdenk- create ARMBoot project (http://sourceforge.net/projects/armboot)
81c609719bSwdenk- add other CPU families (starting with ARM)
8224ee89b9Swdenk- create U-Boot project (http://sourceforge.net/projects/u-boot)
8324ee89b9Swdenk
8424ee89b9Swdenk
8524ee89b9SwdenkNames and Spelling:
8624ee89b9Swdenk===================
8724ee89b9Swdenk
8824ee89b9SwdenkThe "official" name of this project is "Das U-Boot". The spelling
8924ee89b9Swdenk"U-Boot" shall be used in all written text (documentation, comments
9024ee89b9Swdenkin source files etc.). Example:
9124ee89b9Swdenk
9224ee89b9Swdenk	This is the README file for the U-Boot project.
9324ee89b9Swdenk
9424ee89b9SwdenkFile names etc. shall be based on the string "u-boot". Examples:
9524ee89b9Swdenk
9624ee89b9Swdenk	include/asm-ppc/u-boot.h
9724ee89b9Swdenk
9824ee89b9Swdenk	#include <asm/u-boot.h>
9924ee89b9Swdenk
10024ee89b9SwdenkVariable names, preprocessor constants etc. shall be either based on
10124ee89b9Swdenkthe string "u_boot" or on "U_BOOT". Example:
10224ee89b9Swdenk
10324ee89b9Swdenk	U_BOOT_VERSION		u_boot_logo
10424ee89b9Swdenk	IH_OS_U_BOOT		u_boot_hush_start
105c609719bSwdenk
106c609719bSwdenk
10793f19cc0SwdenkVersioning:
10893f19cc0Swdenk===========
10993f19cc0Swdenk
11093f19cc0SwdenkU-Boot uses a 3 level version number containing a version, a
11193f19cc0Swdenksub-version, and a patchlevel: "U-Boot-2.34.5" means version "2",
11293f19cc0Swdenksub-version "34", and patchlevel "4".
11393f19cc0Swdenk
11493f19cc0SwdenkThe patchlevel is used to indicate certain stages of development
11593f19cc0Swdenkbetween released versions, i. e. officially released versions of
11693f19cc0SwdenkU-Boot will always have a patchlevel of "0".
11793f19cc0Swdenk
11893f19cc0Swdenk
119c609719bSwdenkDirectory Hierarchy:
120c609719bSwdenk====================
121c609719bSwdenk
1227152b1d0Swdenk- board		Board dependent files
1237152b1d0Swdenk- common	Misc architecture independent functions
124c609719bSwdenk- cpu		CPU specific files
125c609719bSwdenk- disk		Code for disk drive partition handling
126c609719bSwdenk- doc		Documentation (don't expect too much)
1277152b1d0Swdenk- drivers	Commonly used device drivers
128c609719bSwdenk- dtt		Digital Thermometer and Thermostat drivers
129c609719bSwdenk- examples	Example code for standalone applications, etc.
130c609719bSwdenk- include	Header Files
131c609719bSwdenk- disk		Harddisk interface code
132c609719bSwdenk- net		Networking code
133c609719bSwdenk- ppc		Files generic to PowerPC architecture
134c609719bSwdenk- post		Power On Self Test
135c609719bSwdenk- post/arch		Symlink to architecture specific Power On Self Test
136c609719bSwdenk- post/arch-ppc		PowerPC architecture specific Power On Self Test
137c609719bSwdenk- post/cpu/mpc8260	MPC8260 CPU specific Power On Self Test
138c609719bSwdenk- post/cpu/mpc8xx	MPC8xx CPU specific Power On Self Test
139c609719bSwdenk- rtc		Real Time Clock drivers
140c609719bSwdenk- tools		Tools to build S-Record or U-Boot images, etc.
141c609719bSwdenk
142c609719bSwdenk- cpu/74xx_7xx	Files specific to Motorola MPC74xx and 7xx CPUs
1432e5983d2Swdenk- cpu/arm925t	Files specific to ARM	   925	   CPUs
1446f21347dSwdenk- cpu/arm926ejs	Files specific to ARM	926	CPUs
1450db5bca8Swdenk- cpu/mpc5xx	Files specific to Motorola MPC5xx  CPUs
146c609719bSwdenk- cpu/mpc8xx	Files specific to Motorola MPC8xx  CPUs
147c609719bSwdenk- cpu/mpc824x	Files specific to Motorola MPC824x CPUs
148c609719bSwdenk- cpu/mpc8260	Files specific to Motorola MPC8260 CPU
149c609719bSwdenk- cpu/ppc4xx	Files specific to IBM	   4xx	   CPUs
150c609719bSwdenk
1512e5983d2Swdenk
1523bac3513Swdenk- board/LEOX/   Files specific to boards manufactured by The LEOX team
1533bac3513Swdenk- board/LEOX/elpt860	Files specific to ELPT860 boards
154c609719bSwdenk- board/RPXClassic
155c609719bSwdenk		Files specific to RPXClassic boards
156c609719bSwdenk- board/RPXlite	Files specific to RPXlite    boards
1572abbe075Swdenk- board/at91rm9200dk Files specific to AT91RM9200DK boards
158c609719bSwdenk- board/c2mon	Files specific to c2mon	     boards
1590db5bca8Swdenk- board/cmi	Files specific to cmi        boards
160c609719bSwdenk- board/cogent	Files specific to Cogent     boards
161c609719bSwdenk		(need further configuration)
162c609719bSwdenk		Files specific to CPCIISER4  boards
163c609719bSwdenk- board/cpu86	Files specific to CPU86      boards
164c609719bSwdenk- board/cray/	Files specific to boards manufactured by Cray
165c609719bSwdenk- board/cray/L1		Files specific to L1         boards
166c609719bSwdenk- board/cu824	Files specific to CU824	     boards
167c609719bSwdenk- board/ebony   Files specific to IBM Ebony board
168c609719bSwdenk- board/eric	Files specific to ERIC	     boards
169c609719bSwdenk- board/esd/	Files specific to boards manufactured by ESD
170c609719bSwdenk- board/esd/adciop	Files specific to ADCIOP     boards
171c609719bSwdenk- board/esd/ar405	Files specific to AR405	     boards
172c609719bSwdenk- board/esd/canbt	Files specific to CANBT	     boards
173c609719bSwdenk- board/esd/cpci405	Files specific to CPCI405    boards
174c609719bSwdenk- board/esd/cpciiser4	Files specific to CPCIISER4  boards
175c609719bSwdenk- board/esd/common	Common files for ESD boards
176c609719bSwdenk- board/esd/dasa_sim	Files specific to DASA_SIM   boards
177c609719bSwdenk- board/esd/du405	Files specific to DU405      boards
178c609719bSwdenk- board/esd/ocrtc	Files specific to OCRTC      boards
179c609719bSwdenk- board/esd/pci405	Files specific to PCI405     boards
180c609719bSwdenk- board/esteem192e
181c609719bSwdenk		Files specific to ESTEEM192E boards
182c609719bSwdenk- board/etx094	Files specific to ETX_094    boards
183c609719bSwdenk- board/evb64260
184c609719bSwdenk		Files specific to EVB64260   boards
185c609719bSwdenk- board/fads	Files specific to FADS	     boards
186c609719bSwdenk- board/flagadm Files specific to FLAGADM    boards
1877aa78614Swdenk- board/gen860t Files specific to GEN860T and GEN860T_SC    boards
188c609719bSwdenk- board/genietv Files specific to GENIETV    boards
189c609719bSwdenk- board/gth	Files specific to GTH	     boards
190c609719bSwdenk- board/hermes	Files specific to HERMES     boards
191c609719bSwdenk- board/hymod	Files specific to HYMOD	     boards
192c609719bSwdenk- board/icu862	Files specific to ICU862     boards
193c609719bSwdenk- board/ip860	Files specific to IP860	     boards
194c609719bSwdenk- board/iphase4539
195c609719bSwdenk		Files specific to Interphase4539 boards
196c609719bSwdenk- board/ivm	Files specific to IVMS8/IVML24 boards
197c609719bSwdenk- board/lantec	Files specific to LANTEC     boards
198c609719bSwdenk- board/lwmon	Files specific to LWMON	     boards
199c609719bSwdenk- board/mbx8xx	Files specific to MBX	     boards
200c609719bSwdenk- board/mpc8260ads
2012535d602Swdenk		Files specific to MPC8260ADS and PQ2FADS-ZU boards
202c609719bSwdenk- board/mpl/	Files specific to boards manufactured by MPL
203c609719bSwdenk- board/mpl/common	Common files for MPL boards
204c609719bSwdenk- board/mpl/pip405	Files specific to PIP405     boards
205c609719bSwdenk- board/mpl/mip405	Files specific to MIP405     boards
206531716e1Swdenk- board/mpl/vcma9	Files specific to VCMA9      boards
207c609719bSwdenk- board/musenki	Files specific to MUSEKNI    boards
208c609719bSwdenk- board/mvs1	Files specific to MVS1       boards
209c609719bSwdenk- board/nx823   Files specific to NX823      boards
210c609719bSwdenk- board/oxc	Files specific to OXC        boards
2112e5983d2Swdenk- board/omap1510inn
2122e5983d2Swdenk		Files specific to OMAP 1510 Innovator boards
2136f21347dSwdenk- board/omap1610inn
2146f21347dSwdenk		Files specific to OMAP 1610 Innovator boards
215c609719bSwdenk- board/pcippc2	Files specific to PCIPPC2/PCIPPC6 boards
216c609719bSwdenk- board/pm826	Files specific to PM826      boards
217c609719bSwdenk- board/ppmc8260
218c609719bSwdenk		Files specific to PPMC8260   boards
219c609719bSwdenk- board/rpxsuper
220c609719bSwdenk		Files specific to RPXsuper   boards
221c609719bSwdenk- board/rsdproto
222c609719bSwdenk		Files specific to RSDproto   boards
223c609719bSwdenk- board/sandpoint
224c609719bSwdenk		Files specific to Sandpoint  boards
225c609719bSwdenk- board/sbc8260	Files specific to SBC8260    boards
226c609719bSwdenk- board/sacsng	Files specific to SACSng     boards
227c609719bSwdenk- board/siemens Files specific to boards manufactured by Siemens AG
228c609719bSwdenk- board/siemens/CCM	Files specific to CCM	     boards
229c609719bSwdenk- board/siemens/IAD210	Files specific to IAD210     boards
230c609719bSwdenk- board/siemens/SCM	Files specific to SCM        boards
231c609719bSwdenk- board/siemens/pcu_e	Files specific to PCU_E	     boards
232c609719bSwdenk- board/sixnet	Files specific to SIXNET     boards
233c609719bSwdenk- board/spd8xx	Files specific to SPD8xxTS   boards
234c609719bSwdenk- board/tqm8260 Files specific to TQM8260    boards
235c609719bSwdenk- board/tqm8xx	Files specific to TQM8xxL    boards
236c609719bSwdenk- board/w7o	Files specific to W7O        boards
237c609719bSwdenk- board/walnut405
238c609719bSwdenk		Files specific to Walnut405  boards
239c609719bSwdenk- board/westel/	Files specific to boards manufactured by Westel Wireless
240c609719bSwdenk- board/westel/amx860	Files specific to AMX860     boards
241c609719bSwdenk- board/utx8245	Files specific to UTX8245   boards
24254387ac9Swdenk- board/zpc1900	Files specific to Zephyr Engineering ZPC.1900 board
243c609719bSwdenk
244c609719bSwdenkSoftware Configuration:
245c609719bSwdenk=======================
246c609719bSwdenk
247c609719bSwdenkConfiguration is usually done using C preprocessor defines; the
248c609719bSwdenkrationale behind that is to avoid dead code whenever possible.
249c609719bSwdenk
250c609719bSwdenkThere are two classes of configuration variables:
251c609719bSwdenk
252c609719bSwdenk* Configuration _OPTIONS_:
253c609719bSwdenk  These are selectable by the user and have names beginning with
254c609719bSwdenk  "CONFIG_".
255c609719bSwdenk
256c609719bSwdenk* Configuration _SETTINGS_:
257c609719bSwdenk  These depend on the hardware etc. and should not be meddled with if
258c609719bSwdenk  you don't know what you're doing; they have names beginning with
259c609719bSwdenk  "CFG_".
260c609719bSwdenk
261c609719bSwdenkLater we will add a configuration tool - probably similar to or even
262c609719bSwdenkidentical to what's used for the Linux kernel. Right now, we have to
263c609719bSwdenkdo the configuration by hand, which means creating some symbolic
264c609719bSwdenklinks and editing some configuration files. We use the TQM8xxL boards
265c609719bSwdenkas an example here.
266c609719bSwdenk
267c609719bSwdenk
268c609719bSwdenkSelection of Processor Architecture and Board Type:
269c609719bSwdenk---------------------------------------------------
270c609719bSwdenk
271c609719bSwdenkFor all supported boards there are ready-to-use default
272c609719bSwdenkconfigurations available; just type "make <board_name>_config".
273c609719bSwdenk
274c609719bSwdenkExample: For a TQM823L module type:
275c609719bSwdenk
276c609719bSwdenk	cd u-boot
277c609719bSwdenk	make TQM823L_config
278c609719bSwdenk
279c609719bSwdenkFor the Cogent platform, you need to specify the cpu type as well;
280c609719bSwdenke.g. "make cogent_mpc8xx_config". And also configure the cogent
281c609719bSwdenkdirectory according to the instructions in cogent/README.
282c609719bSwdenk
283c609719bSwdenk
284c609719bSwdenkConfiguration Options:
285c609719bSwdenk----------------------
286c609719bSwdenk
287c609719bSwdenkConfiguration depends on the combination of board and CPU type; all
288c609719bSwdenksuch information is kept in a configuration file
289c609719bSwdenk"include/configs/<board_name>.h".
290c609719bSwdenk
291c609719bSwdenkExample: For a TQM823L module, all configuration settings are in
292c609719bSwdenk"include/configs/TQM823L.h".
293c609719bSwdenk
294c609719bSwdenk
2957f6c2cbcSwdenkMany of the options are named exactly as the corresponding Linux
2967f6c2cbcSwdenkkernel configuration options. The intention is to make it easier to
2977f6c2cbcSwdenkbuild a config tool - later.
2987f6c2cbcSwdenk
2997f6c2cbcSwdenk
300c609719bSwdenkThe following options need to be configured:
301c609719bSwdenk
302c609719bSwdenk- CPU Type:	Define exactly one of
303c609719bSwdenk
304c609719bSwdenk		PowerPC based CPUs:
305c609719bSwdenk		-------------------
306c609719bSwdenk		CONFIG_MPC823,	CONFIG_MPC850,	CONFIG_MPC855,	CONFIG_MPC860
3070db5bca8Swdenk	or	CONFIG_MPC5xx
308c609719bSwdenk	or	CONFIG_MPC824X, CONFIG_MPC8260
309c609719bSwdenk	or	CONFIG_IOP480
310c609719bSwdenk	or	CONFIG_405GP
31112f34241Swdenk	or	CONFIG_405EP
312c609719bSwdenk	or	CONFIG_440
313c609719bSwdenk	or	CONFIG_MPC74xx
31472755c71Swdenk	or	CONFIG_750FX
315c609719bSwdenk
316c609719bSwdenk		ARM based CPUs:
317c609719bSwdenk		---------------
318c609719bSwdenk		CONFIG_SA1110
319c609719bSwdenk		CONFIG_ARM7
320c609719bSwdenk		CONFIG_PXA250
321c609719bSwdenk
322c609719bSwdenk
323c609719bSwdenk- Board Type:	Define exactly one of
324c609719bSwdenk
325c609719bSwdenk		PowerPC based boards:
326c609719bSwdenk		---------------------
327c609719bSwdenk
328c609719bSwdenk		CONFIG_ADCIOP,     CONFIG_ICU862      CONFIG_RPXsuper,
329c609719bSwdenk		CONFIG_ADS860,     CONFIG_IP860,      CONFIG_SM850,
330c609719bSwdenk		CONFIG_AMX860,     CONFIG_IPHASE4539, CONFIG_SPD823TS,
331c609719bSwdenk		CONFIG_AR405,      CONFIG_IVML24,     CONFIG_SXNI855T,
332c609719bSwdenk		CONFIG_BAB7xx,     CONFIG_IVML24_128, CONFIG_Sandpoint8240,
333c609719bSwdenk		CONFIG_CANBT,      CONFIG_IVML24_256, CONFIG_Sandpoint8245,
334c609719bSwdenk		CONFIG_CCM,        CONFIG_IVMS8,      CONFIG_TQM823L,
335c609719bSwdenk		CONFIG_CPCI405,    CONFIG_IVMS8_128,  CONFIG_TQM850L,
336c609719bSwdenk		CONFIG_CPCI4052,   CONFIG_IVMS8_256,  CONFIG_TQM855L,
337c609719bSwdenk		CONFIG_CPCIISER4,  CONFIG_LANTEC,     CONFIG_TQM860L,
338c609719bSwdenk		CONFIG_CPU86,      CONFIG_MBX,        CONFIG_TQM8260,
339c609719bSwdenk		CONFIG_CRAYL1,     CONFIG_MBX860T,    CONFIG_TTTech,
340c609719bSwdenk		CONFIG_CU824,      CONFIG_MHPC,       CONFIG_UTX8245,
341c609719bSwdenk		CONFIG_DASA_SIM,   CONFIG_MIP405,     CONFIG_W7OLMC,
342c609719bSwdenk		CONFIG_DU405,      CONFIG_MOUSSE,     CONFIG_W7OLMG,
343c609719bSwdenk		CONFIG_ELPPC,      CONFIG_MPC8260ADS, CONFIG_WALNUT405,
344c609719bSwdenk		CONFIG_ERIC,       CONFIG_MUSENKI,    CONFIG_ZUMA,
345c609719bSwdenk		CONFIG_ESTEEM192E, CONFIG_MVS1,       CONFIG_c2mon,
346c609719bSwdenk		CONFIG_ETX094,     CONFIG_NX823,      CONFIG_cogent_mpc8260,
347c609719bSwdenk		CONFIG_EVB64260,   CONFIG_OCRTC,      CONFIG_cogent_mpc8xx,
348c609719bSwdenk		CONFIG_FADS823,    CONFIG_ORSG,       CONFIG_ep8260,
349c609719bSwdenk		CONFIG_FADS850SAR, CONFIG_OXC,        CONFIG_gw8260,
350c609719bSwdenk		CONFIG_FADS860T,   CONFIG_PCI405,     CONFIG_hermes,
351c609719bSwdenk		CONFIG_FLAGADM,    CONFIG_PCIPPC2,    CONFIG_hymod,
352c609719bSwdenk		CONFIG_FPS850L,    CONFIG_PCIPPC6,    CONFIG_lwmon,
353c609719bSwdenk		CONFIG_GEN860T,    CONFIG_PIP405,     CONFIG_pcu_e,
354c609719bSwdenk		CONFIG_GENIETV,    CONFIG_PM826,      CONFIG_ppmc8260,
355c609719bSwdenk		CONFIG_GTH,        CONFIG_RPXClassic, CONFIG_rsdproto,
356c609719bSwdenk		CONFIG_IAD210,     CONFIG_RPXlite,    CONFIG_sbc8260,
357608c9146Swdenk		CONFIG_EBONY,      CONFIG_sacsng,     CONFIG_FPS860L,
3587f70e853Swdenk		CONFIG_V37,        CONFIG_ELPT860,    CONFIG_CMI,
35954387ac9Swdenk		CONFIG_NETVIA,     CONFIG_RBC823,     CONFIG_ZPC1900
360c609719bSwdenk
361c609719bSwdenk		ARM based boards:
362c609719bSwdenk		-----------------
363c609719bSwdenk
364c609719bSwdenk		CONFIG_HHP_CRADLE,  CONFIG_DNP1110,    CONFIG_EP7312,
365c609719bSwdenk		CONFIG_IMPA7,       CONFIG_LART,       CONFIG_LUBBOCK,
3666f21347dSwdenk		CONFIG_INNOVATOROMAP1510,	CONFIG_INNOVATOROMAP1610
367c609719bSwdenk		CONFIG_SHANNON,     CONFIG_SMDK2400,   CONFIG_SMDK2410,
368531716e1Swdenk		CONFIG_TRAB,	    CONFIG_VCMA9,      CONFIG_AT91RM9200DK
369c609719bSwdenk
370c609719bSwdenk
371c609719bSwdenk- CPU Module Type: (if CONFIG_COGENT is defined)
372c609719bSwdenk		Define exactly one of
373c609719bSwdenk		CONFIG_CMA286_60_OLD
374c609719bSwdenk--- FIXME --- not tested yet:
375c609719bSwdenk		CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P,
376c609719bSwdenk		CONFIG_CMA287_23, CONFIG_CMA287_50
377c609719bSwdenk
378c609719bSwdenk- Motherboard Type: (if CONFIG_COGENT is defined)
379c609719bSwdenk		Define exactly one of
380c609719bSwdenk		CONFIG_CMA101, CONFIG_CMA102
381c609719bSwdenk
382c609719bSwdenk- Motherboard I/O Modules: (if CONFIG_COGENT is defined)
383c609719bSwdenk		Define one or more of
384c609719bSwdenk		CONFIG_CMA302
385c609719bSwdenk
386c609719bSwdenk- Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined)
387c609719bSwdenk		Define one or more of
388c609719bSwdenk		CONFIG_LCD_HEARTBEAT	- update a character position on
389c609719bSwdenk					  the lcd display every second with
390c609719bSwdenk					  a "rotator" |\-/|\-/
391c609719bSwdenk
3922535d602Swdenk- Board flavour: (if CONFIG_MPC8260ADS is defined)
3932535d602Swdenk		CONFIG_ADSTYPE
3942535d602Swdenk		Possible values are:
3952535d602Swdenk			CFG_8260ADS	- original MPC8260ADS
3962535d602Swdenk			CFG_8266ADS	- MPC8266ADS (untested)
39754387ac9Swdenk			CFG_PQ2FADS	- PQ2FADS-ZU or PQ2FADS-VR
3982535d602Swdenk
3992535d602Swdenk
400c609719bSwdenk- MPC824X Family Member (if CONFIG_MPC824X is defined)
401c609719bSwdenk		Define exactly one of
402c609719bSwdenk		CONFIG_MPC8240, CONFIG_MPC8245
403c609719bSwdenk
404c609719bSwdenk- 8xx CPU Options: (if using an 8xx cpu)
405c609719bSwdenk		Define one or more of
406*5da627a4Swdenk		CONFIG_8xx_GCLK_FREQ	- if get_gclk_freq() cannot work
407*5da627a4Swdenk					  e.g. if there is no 32KHz
408*5da627a4Swdenk					  reference PIT/RTC clock
409c609719bSwdenk
410*5da627a4Swdenk- Linux Kernel Interface:
411c609719bSwdenk		CONFIG_CLOCKS_IN_MHZ
412c609719bSwdenk
413c609719bSwdenk		U-Boot stores all clock information in Hz
414c609719bSwdenk		internally. For binary compatibility with older Linux
415c609719bSwdenk		kernels (which expect the clocks passed in the
416c609719bSwdenk		bd_info data to be in MHz) the environment variable
417c609719bSwdenk		"clocks_in_mhz" can be defined so that U-Boot
418c609719bSwdenk		converts clock data to MHZ before passing it to the
419c609719bSwdenk		Linux kernel.
420c609719bSwdenk		When CONFIG_CLOCKS_IN_MHZ is defined, a definition of
421c609719bSwdenk		"clocks_in_mhz=1" is  automatically  included  in  the
422c609719bSwdenk		default environment.
423c609719bSwdenk
424*5da627a4Swdenk		CONFIG_MEMSIZE_IN_BYTES		[relevant for MIPS only]
425*5da627a4Swdenk
426*5da627a4Swdenk		When transfering memsize parameter to linux, some versions
427*5da627a4Swdenk		expect it to be in bytes, others in MB.
428*5da627a4Swdenk		Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes.
429*5da627a4Swdenk
430c609719bSwdenk- Console Interface:
431c609719bSwdenk		Depending on board, define exactly one serial port
432c609719bSwdenk		(like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2,
433c609719bSwdenk		CONFIG_8xx_CONS_SCC1, ...), or switch off the serial
434c609719bSwdenk		console by defining CONFIG_8xx_CONS_NONE
435c609719bSwdenk
436c609719bSwdenk		Note: if CONFIG_8xx_CONS_NONE is defined, the serial
437c609719bSwdenk		port routines must be defined elsewhere
438c609719bSwdenk		(i.e. serial_init(), serial_getc(), ...)
439c609719bSwdenk
440c609719bSwdenk		CONFIG_CFB_CONSOLE
441c609719bSwdenk		Enables console device for a color framebuffer. Needs following
442c609719bSwdenk		defines (cf. smiLynxEM, i8042, board/eltec/bab7xx)
443c609719bSwdenk			VIDEO_FB_LITTLE_ENDIAN	graphic memory organisation
444c609719bSwdenk						(default big endian)
445c609719bSwdenk			VIDEO_HW_RECTFILL	graphic chip supports
446c609719bSwdenk						rectangle fill
447c609719bSwdenk						(cf. smiLynxEM)
448c609719bSwdenk			VIDEO_HW_BITBLT		graphic chip supports
449c609719bSwdenk						bit-blit (cf. smiLynxEM)
450c609719bSwdenk			VIDEO_VISIBLE_COLS	visible pixel columns
451c609719bSwdenk						(cols=pitch)
452c609719bSwdenk			VIDEO_VISIBLE_ROWS      visible pixel rows
453c609719bSwdenk			VIDEO_PIXEL_SIZE        bytes per pixel
454c609719bSwdenk			VIDEO_DATA_FORMAT	graphic data format
455c609719bSwdenk						(0-5, cf. cfb_console.c)
456c609719bSwdenk			VIDEO_FB_ADRS           framebuffer address
457c609719bSwdenk			VIDEO_KBD_INIT_FCT	keyboard int fct
458c609719bSwdenk						(i.e. i8042_kbd_init())
459c609719bSwdenk			VIDEO_TSTC_FCT		test char fct
460c609719bSwdenk						(i.e. i8042_tstc)
461c609719bSwdenk			VIDEO_GETC_FCT		get char fct
462c609719bSwdenk						(i.e. i8042_getc)
463c609719bSwdenk			CONFIG_CONSOLE_CURSOR	cursor drawing on/off
464c609719bSwdenk						(requires blink timer
465c609719bSwdenk						cf. i8042.c)
466c609719bSwdenk			CFG_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c)
467c609719bSwdenk			CONFIG_CONSOLE_TIME	display time/date info in
468c609719bSwdenk						upper right corner
469c609719bSwdenk						(requires CFG_CMD_DATE)
470c609719bSwdenk			CONFIG_VIDEO_LOGO	display Linux logo in
471c609719bSwdenk						upper left corner
472a6c7ad2fSwdenk			CONFIG_VIDEO_BMP_LOGO	use bmp_logo.h instead of
473a6c7ad2fSwdenk						linux_logo.h for logo.
474a6c7ad2fSwdenk						Requires CONFIG_VIDEO_LOGO
475c609719bSwdenk			CONFIG_CONSOLE_EXTRA_INFO
476c609719bSwdenk						addional board info beside
477c609719bSwdenk						the logo
478c609719bSwdenk
479c609719bSwdenk		When CONFIG_CFB_CONSOLE is defined, video console is
480c609719bSwdenk		default i/o. Serial console can be forced with
481c609719bSwdenk		environment 'console=serial'.
482c609719bSwdenk
483c609719bSwdenk- Console Baudrate:
484c609719bSwdenk		CONFIG_BAUDRATE - in bps
485c609719bSwdenk		Select one of the baudrates listed in
486c609719bSwdenk		CFG_BAUDRATE_TABLE, see below.
487c609719bSwdenk
488c609719bSwdenk- Interrupt driven serial port input:
489c609719bSwdenk		CONFIG_SERIAL_SOFTWARE_FIFO
490c609719bSwdenk
491c609719bSwdenk		PPC405GP only.
492c609719bSwdenk		Use an interrupt handler for receiving data on the
493c609719bSwdenk		serial port. It also enables using hardware handshake
494c609719bSwdenk		(RTS/CTS) and UART's built-in FIFO. Set the number of
495c609719bSwdenk		bytes the interrupt driven input buffer should have.
496c609719bSwdenk
497c609719bSwdenk		Set to 0 to disable this feature (this is the default).
498c609719bSwdenk		This will also disable hardware handshake.
499c609719bSwdenk
5001d49b1f3Sstroese- Console UART Number:
5011d49b1f3Sstroese		CONFIG_UART1_CONSOLE
5021d49b1f3Sstroese
5031d49b1f3Sstroese		IBM PPC4xx only.
5041d49b1f3Sstroese		If defined internal UART1 (and not UART0) is used
5051d49b1f3Sstroese		as default U-Boot console.
5061d49b1f3Sstroese
507c609719bSwdenk- Boot Delay:	CONFIG_BOOTDELAY - in seconds
508c609719bSwdenk		Delay before automatically booting the default image;
509c609719bSwdenk		set to -1 to disable autoboot.
510c609719bSwdenk
511c609719bSwdenk		See doc/README.autoboot for these options that
512c609719bSwdenk		work with CONFIG_BOOTDELAY. None are required.
513c609719bSwdenk		CONFIG_BOOT_RETRY_TIME
514c609719bSwdenk		CONFIG_BOOT_RETRY_MIN
515c609719bSwdenk		CONFIG_AUTOBOOT_KEYED
516c609719bSwdenk		CONFIG_AUTOBOOT_PROMPT
517c609719bSwdenk		CONFIG_AUTOBOOT_DELAY_STR
518c609719bSwdenk		CONFIG_AUTOBOOT_STOP_STR
519c609719bSwdenk		CONFIG_AUTOBOOT_DELAY_STR2
520c609719bSwdenk		CONFIG_AUTOBOOT_STOP_STR2
521c609719bSwdenk		CONFIG_ZERO_BOOTDELAY_CHECK
522c609719bSwdenk		CONFIG_RESET_TO_RETRY
523c609719bSwdenk
524c609719bSwdenk- Autoboot Command:
525c609719bSwdenk		CONFIG_BOOTCOMMAND
526c609719bSwdenk		Only needed when CONFIG_BOOTDELAY is enabled;
527c609719bSwdenk		define a command string that is automatically executed
528c609719bSwdenk		when no character is read on the console interface
529c609719bSwdenk		within "Boot Delay" after reset.
530c609719bSwdenk
531c609719bSwdenk		CONFIG_BOOTARGS
532c609719bSwdenk		This can be used to pass arguments to the bootm
533c609719bSwdenk		command. The value of CONFIG_BOOTARGS goes into the
534c609719bSwdenk		environment value "bootargs".
535c609719bSwdenk
536c609719bSwdenk		CONFIG_RAMBOOT and CONFIG_NFSBOOT
537c609719bSwdenk		The value of these goes into the environment as
538c609719bSwdenk		"ramboot" and "nfsboot" respectively, and can be used
539c609719bSwdenk		as a convenience, when switching between booting from
540c609719bSwdenk		ram and nfs.
541c609719bSwdenk
542c609719bSwdenk- Pre-Boot Commands:
543c609719bSwdenk		CONFIG_PREBOOT
544c609719bSwdenk
545c609719bSwdenk		When this option is #defined, the existence of the
546c609719bSwdenk		environment variable "preboot" will be checked
547c609719bSwdenk		immediately before starting the CONFIG_BOOTDELAY
548c609719bSwdenk		countdown and/or running the auto-boot command resp.
549c609719bSwdenk		entering interactive mode.
550c609719bSwdenk
551c609719bSwdenk		This feature is especially useful when "preboot" is
552c609719bSwdenk		automatically generated or modified. For an example
553c609719bSwdenk		see the LWMON board specific code: here "preboot" is
554c609719bSwdenk		modified when the user holds down a certain
555c609719bSwdenk		combination of keys on the (special) keyboard when
556c609719bSwdenk		booting the systems
557c609719bSwdenk
558c609719bSwdenk- Serial Download Echo Mode:
559c609719bSwdenk		CONFIG_LOADS_ECHO
560c609719bSwdenk		If defined to 1, all characters received during a
561c609719bSwdenk		serial download (using the "loads" command) are
562c609719bSwdenk		echoed back. This might be needed by some terminal
563c609719bSwdenk		emulations (like "cu"), but may as well just take
564c609719bSwdenk		time on others. This setting #define's the initial
565c609719bSwdenk		value of the "loads_echo" environment variable.
566c609719bSwdenk
567c609719bSwdenk- Kgdb Serial Baudrate: (if CFG_CMD_KGDB is defined)
568c609719bSwdenk		CONFIG_KGDB_BAUDRATE
569c609719bSwdenk		Select one of the baudrates listed in
570c609719bSwdenk		CFG_BAUDRATE_TABLE, see below.
571c609719bSwdenk
572c609719bSwdenk- Monitor Functions:
573c609719bSwdenk		CONFIG_COMMANDS
574c609719bSwdenk		Most monitor functions can be selected (or
575c609719bSwdenk		de-selected) by adjusting the definition of
576c609719bSwdenk		CONFIG_COMMANDS; to select individual functions,
577c609719bSwdenk		#define CONFIG_COMMANDS by "OR"ing any of the
578c609719bSwdenk		following values:
579c609719bSwdenk
580c609719bSwdenk		#define enables commands:
581c609719bSwdenk		-------------------------
582c609719bSwdenk		CFG_CMD_ASKENV	* ask for env variable
58378137c3cSwdenk		CFG_CMD_AUTOSCRIPT Autoscript Support
584c609719bSwdenk		CFG_CMD_BDI	  bdinfo
585c609719bSwdenk		CFG_CMD_BEDBUG	  Include BedBug Debugger
58678137c3cSwdenk		CFG_CMD_BMP     * BMP support
587c609719bSwdenk		CFG_CMD_BOOTD	  bootd
588c609719bSwdenk		CFG_CMD_CACHE	  icache, dcache
589c609719bSwdenk		CFG_CMD_CONSOLE	  coninfo
590c609719bSwdenk		CFG_CMD_DATE	* support for RTC, date/time...
591c609719bSwdenk		CFG_CMD_DHCP	  DHCP support
59278137c3cSwdenk		CFG_CMD_DIAG    * Diagnostics
59378137c3cSwdenk		CFG_CMD_DOC     * Disk-On-Chip Support
59478137c3cSwdenk		CFG_CMD_DTT       Digital Therm and Thermostat
595c609719bSwdenk		CFG_CMD_ECHO	* echo arguments
596c609719bSwdenk		CFG_CMD_EEPROM	* EEPROM read/write support
597c609719bSwdenk		CFG_CMD_ELF	  bootelf, bootvx
598c609719bSwdenk		CFG_CMD_ENV	  saveenv
599c609719bSwdenk		CFG_CMD_FDC	* Floppy Disk Support
60071f95118Swdenk		CFG_CMD_FAT	  FAT partition support
6012262cfeeSwdenk		CFG_CMD_FDOS	* Dos diskette Support
602c609719bSwdenk		CFG_CMD_FLASH	  flinfo, erase, protect
603c609719bSwdenk		CFG_CMD_FPGA	  FPGA device initialization support
60478137c3cSwdenk		CFG_CMD_HWFLOW  * RTS/CTS hw flow control
605c609719bSwdenk		CFG_CMD_I2C	* I2C serial bus support
606c609719bSwdenk		CFG_CMD_IDE	* IDE harddisk support
607c609719bSwdenk		CFG_CMD_IMI	  iminfo
60878137c3cSwdenk		CFG_CMD_IMLS      List all found images
609c609719bSwdenk		CFG_CMD_IMMAP	* IMMR dump support
610c609719bSwdenk		CFG_CMD_IRQ	* irqinfo
61178137c3cSwdenk		CFG_CMD_JFFS2   * JFFS2 Support
612c609719bSwdenk		CFG_CMD_KGDB	* kgdb
613c609719bSwdenk		CFG_CMD_LOADB	  loadb
614c609719bSwdenk		CFG_CMD_LOADS	  loads
615c609719bSwdenk		CFG_CMD_MEMORY	  md, mm, nm, mw, cp, cmp, crc, base,
616c609719bSwdenk				  loop, mtest
61778137c3cSwdenk		CFG_CMD_MISC      Misc functions like sleep etc
61871f95118Swdenk		CFG_CMD_MMC	  MMC memory mapped support
619c609719bSwdenk		CFG_CMD_MII	  MII utility commands
62078137c3cSwdenk		CFG_CMD_NAND    * NAND support
621c609719bSwdenk		CFG_CMD_NET	  bootp, tftpboot, rarpboot
622c609719bSwdenk		CFG_CMD_PCI	* pciinfo
623c609719bSwdenk		CFG_CMD_PCMCIA	* PCMCIA support
62478137c3cSwdenk		CFG_CMD_PING    * send ICMP ECHO_REQUEST to network host
62578137c3cSwdenk		CFG_CMD_PORTIO    Port I/O
626c609719bSwdenk		CFG_CMD_REGINFO * Register dump
627c609719bSwdenk		CFG_CMD_RUN	  run command in env variable
62878137c3cSwdenk		CFG_CMD_SAVES     save S record dump
629c609719bSwdenk		CFG_CMD_SCSI	* SCSI Support
63078137c3cSwdenk		CFG_CMD_SDRAM   * print SDRAM configuration information
631c609719bSwdenk		CFG_CMD_SETGETDCR Support for DCR Register access (4xx only)
632c609719bSwdenk		CFG_CMD_SPI	* SPI serial bus support
633c609719bSwdenk		CFG_CMD_USB	* USB support
63478137c3cSwdenk		CFG_CMD_VFD     * VFD support (TRAB)
635c609719bSwdenk		CFG_CMD_BSP	* Board SPecific functions
636c609719bSwdenk		-----------------------------------------------
637c609719bSwdenk		CFG_CMD_ALL	all
638c609719bSwdenk
639c609719bSwdenk		CFG_CMD_DFL	Default configuration; at the moment
640c609719bSwdenk				this is includes all commands, except
641c609719bSwdenk				the ones marked with "*" in the list
642c609719bSwdenk				above.
643c609719bSwdenk
644c609719bSwdenk		If you don't define CONFIG_COMMANDS it defaults to
645c609719bSwdenk		CFG_CMD_DFL in include/cmd_confdefs.h. A board can
646c609719bSwdenk		override the default settings in the respective
647c609719bSwdenk		include file.
648c609719bSwdenk
649c609719bSwdenk		EXAMPLE: If you want all functions except of network
650c609719bSwdenk		support you can write:
651c609719bSwdenk
652c609719bSwdenk		#define CONFIG_COMMANDS (CFG_CMD_ALL & ~CFG_CMD_NET)
653c609719bSwdenk
654c609719bSwdenk
655c609719bSwdenk	Note:	Don't enable the "icache" and "dcache" commands
656c609719bSwdenk		(configuration option CFG_CMD_CACHE) unless you know
657c609719bSwdenk		what you (and your U-Boot users) are doing. Data
658c609719bSwdenk		cache cannot be enabled on systems like the 8xx or
659c609719bSwdenk		8260 (where accesses to the IMMR region must be
660c609719bSwdenk		uncached), and it cannot be disabled on all other
661c609719bSwdenk		systems where we (mis-) use the data cache to hold an
662c609719bSwdenk		initial stack and some data.
663c609719bSwdenk
664c609719bSwdenk
665c609719bSwdenk		XXX - this list needs to get updated!
666c609719bSwdenk
667c609719bSwdenk- Watchdog:
668c609719bSwdenk		CONFIG_WATCHDOG
669c609719bSwdenk		If this variable is defined, it enables watchdog
6707152b1d0Swdenk		support. There must be support in the platform specific
671c609719bSwdenk		code for a watchdog. For the 8xx and 8260 CPUs, the
672c609719bSwdenk		SIU Watchdog feature is enabled in the SYPCR
673c609719bSwdenk		register.
674c609719bSwdenk
675c1551ea8Sstroese- U-Boot Version:
676c1551ea8Sstroese		CONFIG_VERSION_VARIABLE
677c1551ea8Sstroese		If this variable is defined, an environment variable
678c1551ea8Sstroese		named "ver" is created by U-Boot showing the U-Boot
679c1551ea8Sstroese		version as printed by the "version" command.
680c1551ea8Sstroese		This variable is readonly.
681c1551ea8Sstroese
682c609719bSwdenk- Real-Time Clock:
683c609719bSwdenk
684c609719bSwdenk		When CFG_CMD_DATE is selected, the type of the RTC
685c609719bSwdenk		has to be selected, too. Define exactly one of the
686c609719bSwdenk		following options:
687c609719bSwdenk
688c609719bSwdenk		CONFIG_RTC_MPC8xx	- use internal RTC of MPC8xx
689c609719bSwdenk		CONFIG_RTC_PCF8563	- use Philips PCF8563 RTC
690c609719bSwdenk		CONFIG_RTC_MC146818	- use MC146818 RTC
6911cb8e980Swdenk		CONFIG_RTC_DS1307	- use Maxim, Inc. DS1307 RTC
692c609719bSwdenk		CONFIG_RTC_DS1337	- use Maxim, Inc. DS1337 RTC
6937f70e853Swdenk		CONFIG_RTC_DS1338	- use Maxim, Inc. DS1338 RTC
6943bac3513Swdenk		CONFIG_RTC_DS164x	- use Dallas DS164x RTC
695c609719bSwdenk
696b37c7e5eSwdenk		Note that if the RTC uses I2C, then the I2C interface
697b37c7e5eSwdenk		must also be configured. See I2C Support, below.
698b37c7e5eSwdenk
699c609719bSwdenk- Timestamp Support:
700c609719bSwdenk
701c609719bSwdenk		When CONFIG_TIMESTAMP is selected, the timestamp
702c609719bSwdenk		(date and time) of an image is printed by image
703c609719bSwdenk		commands like bootm or iminfo. This option is
704c609719bSwdenk		automatically enabled when you select CFG_CMD_DATE .
705c609719bSwdenk
706c609719bSwdenk- Partition Support:
707c609719bSwdenk		CONFIG_MAC_PARTITION and/or CONFIG_DOS_PARTITION
708c609719bSwdenk		and/or CONFIG_ISO_PARTITION
709c609719bSwdenk
710c609719bSwdenk		If IDE or SCSI support	is  enabled  (CFG_CMD_IDE  or
711c609719bSwdenk		CFG_CMD_SCSI) you must configure support for at least
712c609719bSwdenk		one partition type as well.
713c609719bSwdenk
714c609719bSwdenk- IDE Reset method:
715c609719bSwdenk		CONFIG_IDE_RESET_ROUTINE
716c609719bSwdenk
717c609719bSwdenk		Set this to define that instead of a reset Pin, the
718c609719bSwdenk		routine ide_set_reset(int idereset) will be used.
719c609719bSwdenk
720c609719bSwdenk- ATAPI Support:
721c609719bSwdenk		CONFIG_ATAPI
722c609719bSwdenk
723c609719bSwdenk		Set this to enable ATAPI support.
724c609719bSwdenk
725c609719bSwdenk- SCSI Support:
726c609719bSwdenk		At the moment only there is only support for the
727c609719bSwdenk		SYM53C8XX SCSI controller; define
728c609719bSwdenk		CONFIG_SCSI_SYM53C8XX to enable it.
729c609719bSwdenk
730c609719bSwdenk		CFG_SCSI_MAX_LUN [8], CFG_SCSI_MAX_SCSI_ID [7] and
731c609719bSwdenk		CFG_SCSI_MAX_DEVICE [CFG_SCSI_MAX_SCSI_ID *
732c609719bSwdenk		CFG_SCSI_MAX_LUN] can be adjusted to define the
733c609719bSwdenk		maximum numbers of LUNs, SCSI ID's and target
734c609719bSwdenk		devices.
735c609719bSwdenk		CFG_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz)
736c609719bSwdenk
737c609719bSwdenk- NETWORK Support (PCI):
738682011ffSwdenk		CONFIG_E1000
739682011ffSwdenk		Support for Intel 8254x gigabit chips.
740682011ffSwdenk
741c609719bSwdenk		CONFIG_EEPRO100
742c609719bSwdenk		Support for Intel 82557/82559/82559ER chips.
743c609719bSwdenk		Optional CONFIG_EEPRO100_SROM_WRITE enables eeprom
744c609719bSwdenk		write routine for first time initialisation.
745c609719bSwdenk
746c609719bSwdenk		CONFIG_TULIP
747c609719bSwdenk		Support for Digital 2114x chips.
748c609719bSwdenk		Optional CONFIG_TULIP_SELECT_MEDIA for board specific
749c609719bSwdenk		modem chip initialisation (KS8761/QS6611).
750c609719bSwdenk
751c609719bSwdenk		CONFIG_NATSEMI
752c609719bSwdenk		Support for National dp83815 chips.
753c609719bSwdenk
754c609719bSwdenk		CONFIG_NS8382X
755c609719bSwdenk		Support for National dp8382[01] gigabit chips.
756c609719bSwdenk
75745219c46Swdenk- NETWORK Support (other):
75845219c46Swdenk
75945219c46Swdenk		CONFIG_DRIVER_LAN91C96
76045219c46Swdenk		Support for SMSC's LAN91C96 chips.
76145219c46Swdenk
76245219c46Swdenk			CONFIG_LAN91C96_BASE
76345219c46Swdenk			Define this to hold the physical address
76445219c46Swdenk			of the LAN91C96's I/O space
76545219c46Swdenk
76645219c46Swdenk			CONFIG_LAN91C96_USE_32_BIT
76745219c46Swdenk			Define this to enable 32 bit addressing
76845219c46Swdenk
769c609719bSwdenk- USB Support:
770c609719bSwdenk		At the moment only the UHCI host controller is
771c609719bSwdenk		supported (PIP405, MIP405); define
772c609719bSwdenk		CONFIG_USB_UHCI to enable it.
773c609719bSwdenk		define CONFIG_USB_KEYBOARD to enable the USB Keyboard
774c609719bSwdenk		end define CONFIG_USB_STORAGE to enable the USB
775c609719bSwdenk		storage devices.
776c609719bSwdenk		Note:
777c609719bSwdenk		Supported are USB Keyboards and USB Floppy drives
778c609719bSwdenk		(TEAC FD-05PUB).
779c609719bSwdenk
78071f95118Swdenk- MMC Support:
78171f95118Swdenk		The MMC controller on the Intel PXA is supported. To
78271f95118Swdenk		enable this define CONFIG_MMC. The MMC can be
78371f95118Swdenk		accessed from the boot prompt by mapping the device
78471f95118Swdenk		to physical memory similar to flash. Command line is
78571f95118Swdenk		enabled with CFG_CMD_MMC. The MMC driver also works with
78671f95118Swdenk		the FAT fs. This is enabled with CFG_CMD_FAT.
78771f95118Swdenk
788c609719bSwdenk- Keyboard Support:
789c609719bSwdenk		CONFIG_ISA_KEYBOARD
790c609719bSwdenk
791c609719bSwdenk		Define this to enable standard (PC-Style) keyboard
792c609719bSwdenk		support
793c609719bSwdenk
794c609719bSwdenk		CONFIG_I8042_KBD
795c609719bSwdenk		Standard PC keyboard driver with US (is default) and
796c609719bSwdenk		GERMAN key layout (switch via environment 'keymap=de') support.
797c609719bSwdenk		Export function i8042_kbd_init, i8042_tstc and i8042_getc
798c609719bSwdenk		for cfb_console. Supports cursor blinking.
799c609719bSwdenk
800c609719bSwdenk- Video support:
801c609719bSwdenk		CONFIG_VIDEO
802c609719bSwdenk
803c609719bSwdenk		Define this to enable video support (for output to
804c609719bSwdenk		video).
805c609719bSwdenk
806c609719bSwdenk		CONFIG_VIDEO_CT69000
807c609719bSwdenk
808c609719bSwdenk		Enable Chips & Technologies 69000 Video chip
809c609719bSwdenk
810c609719bSwdenk		CONFIG_VIDEO_SMI_LYNXEM
811c609719bSwdenk		Enable Silicon Motion SMI 712/710/810 Video chip
812c609719bSwdenk		Videomode are selected via environment 'videomode' with
813c609719bSwdenk		standard LiLo mode numbers.
814c609719bSwdenk		Following modes are supported  (* is default):
815c609719bSwdenk
816c609719bSwdenk			    800x600  1024x768  1280x1024
817c609719bSwdenk	      256  (8bit)     303*      305       307
818c609719bSwdenk	    65536 (16bit)     314       317       31a
819c609719bSwdenk	16,7 Mill (24bit)     315       318       31b
820c609719bSwdenk		(i.e. setenv videomode 317; saveenv; reset;)
821c609719bSwdenk
822a6c7ad2fSwdenk		CONFIG_VIDEO_SED13806
823a6c7ad2fSwdenk		Enable Epson SED13806 driver. This driver supports 8bpp
824a6c7ad2fSwdenk		and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP
825a6c7ad2fSwdenk		or CONFIG_VIDEO_SED13806_16BPP
826a6c7ad2fSwdenk
827682011ffSwdenk- Keyboard Support:
828682011ffSwdenk		CONFIG_KEYBOARD
829682011ffSwdenk
830682011ffSwdenk		Define this to enable a custom keyboard support.
831682011ffSwdenk		This simply calls drv_keyboard_init() which must be
832682011ffSwdenk		defined in your board-specific files.
833682011ffSwdenk		The only board using this so far is RBC823.
834a6c7ad2fSwdenk
835c609719bSwdenk- LCD Support:	CONFIG_LCD
836c609719bSwdenk
837c609719bSwdenk		Define this to enable LCD support (for output to LCD
838c609719bSwdenk		display); also select one of the supported displays
839c609719bSwdenk		by defining one of these:
840c609719bSwdenk
841c609719bSwdenk		CONFIG_NEC_NL6648AC33:
842c609719bSwdenk
843c609719bSwdenk			NEC NL6648AC33-18. Active, color, single scan.
844c609719bSwdenk
845c609719bSwdenk		CONFIG_NEC_NL6648BC20
846c609719bSwdenk
847c609719bSwdenk			NEC NL6648BC20-08. 6.5", 640x480.
848c609719bSwdenk			Active, color, single scan.
849c609719bSwdenk
850c609719bSwdenk		CONFIG_SHARP_16x9
851c609719bSwdenk
852c609719bSwdenk			Sharp 320x240. Active, color, single scan.
853c609719bSwdenk			It isn't 16x9, and I am not sure what it is.
854c609719bSwdenk
855c609719bSwdenk		CONFIG_SHARP_LQ64D341
856c609719bSwdenk
857c609719bSwdenk			Sharp LQ64D341 display, 640x480.
858c609719bSwdenk			Active, color, single scan.
859c609719bSwdenk
860c609719bSwdenk		CONFIG_HLD1045
861c609719bSwdenk
862c609719bSwdenk			HLD1045 display, 640x480.
863c609719bSwdenk			Active, color, single scan.
864c609719bSwdenk
865c609719bSwdenk		CONFIG_OPTREX_BW
866c609719bSwdenk
867c609719bSwdenk			Optrex	 CBL50840-2 NF-FW 99 22 M5
868c609719bSwdenk			or
869c609719bSwdenk			Hitachi	 LMG6912RPFC-00T
870c609719bSwdenk			or
871c609719bSwdenk			Hitachi	 SP14Q002
872c609719bSwdenk
873c609719bSwdenk			320x240. Black & white.
874c609719bSwdenk
875c609719bSwdenk		Normally display is black on white background; define
876c609719bSwdenk		CFG_WHITE_ON_BLACK to get it inverted.
877c609719bSwdenk
8787152b1d0Swdenk- Splash Screen Support: CONFIG_SPLASH_SCREEN
879d791b1dcSwdenk
880d791b1dcSwdenk		If this option is set, the environment is checked for
881d791b1dcSwdenk		a variable "splashimage". If found, the usual display
882d791b1dcSwdenk		of logo, copyright and system information on the LCD
883d791b1dcSwdenk		is supressed and the BMP image at the address
884d791b1dcSwdenk		specified in "splashimage" is loaded instead. The
885d791b1dcSwdenk		console is redirected to the "nulldev", too. This
886d791b1dcSwdenk		allows for a "silent" boot where a splash screen is
887d791b1dcSwdenk		loaded very quickly after power-on.
888d791b1dcSwdenk
889c29fdfc1Swdenk- Compression support:
890c29fdfc1Swdenk		CONFIG_BZIP2
891c29fdfc1Swdenk
892c29fdfc1Swdenk		If this option is set, support for bzip2 compressed
893c29fdfc1Swdenk		images is included. If not, only uncompressed and gzip
894c29fdfc1Swdenk		compressed images are supported.
895c29fdfc1Swdenk
896c29fdfc1Swdenk                NOTE: the bzip2 algorithm requires a lot of RAM, so
897c29fdfc1Swdenk                the malloc area (as defined by CFG_MALLOC_LEN) should
898c29fdfc1Swdenk                be at least 4MB.
899d791b1dcSwdenk
900c609719bSwdenk- Ethernet address:
901c609719bSwdenk		CONFIG_ETHADDR
902c609719bSwdenk		CONFIG_ETH2ADDR
903c609719bSwdenk		CONFIG_ETH3ADDR
904c609719bSwdenk
905c609719bSwdenk		Define a default value for ethernet address to use
906c609719bSwdenk		for the respective ethernet interface, in case this
907c609719bSwdenk		is not determined automatically.
908c609719bSwdenk
909c609719bSwdenk- IP address:
910c609719bSwdenk		CONFIG_IPADDR
911c609719bSwdenk
912c609719bSwdenk		Define a default value for the IP address to use for
913c609719bSwdenk		the default ethernet interface, in case this is not
914c609719bSwdenk		determined through e.g. bootp.
915c609719bSwdenk
916c609719bSwdenk- Server IP address:
917c609719bSwdenk		CONFIG_SERVERIP
918c609719bSwdenk
919c609719bSwdenk		Defines a default value for theIP address of a TFTP
920c609719bSwdenk		server to contact when using the "tftboot" command.
921c609719bSwdenk
922c609719bSwdenk- BOOTP Recovery Mode:
923c609719bSwdenk		CONFIG_BOOTP_RANDOM_DELAY
924c609719bSwdenk
925c609719bSwdenk		If you have many targets in a network that try to
926c609719bSwdenk		boot using BOOTP, you may want to avoid that all
927c609719bSwdenk		systems send out BOOTP requests at precisely the same
928c609719bSwdenk		moment (which would happen for instance at recovery
929c609719bSwdenk		from a power failure, when all systems will try to
930c609719bSwdenk		boot, thus flooding the BOOTP server. Defining
931c609719bSwdenk		CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be
932c609719bSwdenk		inserted before sending out BOOTP requests. The
933c609719bSwdenk		following delays are insterted then:
934c609719bSwdenk
935c609719bSwdenk		1st BOOTP request:	delay 0 ... 1 sec
936c609719bSwdenk		2nd BOOTP request:	delay 0 ... 2 sec
937c609719bSwdenk		3rd BOOTP request:	delay 0 ... 4 sec
938c609719bSwdenk		4th and following
939c609719bSwdenk		BOOTP requests:		delay 0 ... 8 sec
940c609719bSwdenk
941fe389a82Sstroese- DHCP Advanced Options:
942fe389a82Sstroese		CONFIG_BOOTP_MASK
943fe389a82Sstroese
944fe389a82Sstroese		You can fine tune the DHCP functionality by adding
945fe389a82Sstroese		these flags to the CONFIG_BOOTP_MASK define:
946fe389a82Sstroese
947fe389a82Sstroese		CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS
948fe389a82Sstroese		serverip from a DHCP server, it is possible that more
949fe389a82Sstroese		than one DNS serverip is offered to the client.
950fe389a82Sstroese		If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS
951fe389a82Sstroese		serverip will be stored in the additional environment
952fe389a82Sstroese		variable "dnsip2". The first DNS serverip is always
953fe389a82Sstroese		stored in the variable "dnsip", when CONFIG_BOOTP_DNS
954fe389a82Sstroese		is added to the CONFIG_BOOTP_MASK.
955fe389a82Sstroese
956fe389a82Sstroese		CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable
957fe389a82Sstroese		to do a dynamic update of a DNS server. To do this, they
958fe389a82Sstroese		need the hostname of the DHCP requester.
959fe389a82Sstroese		If CONFIG_BOOP_SEND_HOSTNAME is added to the
960fe389a82Sstroese		CONFIG_BOOTP_MASK, the content of the "hostname"
961fe389a82Sstroese		environment variable is passed as option 12 to
962fe389a82Sstroese		the DHCP server.
963fe389a82Sstroese
964c609719bSwdenk- Status LED:	CONFIG_STATUS_LED
965c609719bSwdenk
966c609719bSwdenk		Several configurations allow to display the current
967c609719bSwdenk		status using a LED. For instance, the LED will blink
968c609719bSwdenk		fast while running U-Boot code, stop blinking as
969c609719bSwdenk		soon as a reply to a BOOTP request was received, and
970c609719bSwdenk		start blinking slow once the Linux kernel is running
971c609719bSwdenk		(supported by a status LED driver in the Linux
972c609719bSwdenk		kernel). Defining CONFIG_STATUS_LED enables this
973c609719bSwdenk		feature in U-Boot.
974c609719bSwdenk
975c609719bSwdenk- CAN Support:	CONFIG_CAN_DRIVER
976c609719bSwdenk
977c609719bSwdenk		Defining CONFIG_CAN_DRIVER enables CAN driver support
978c609719bSwdenk		on those systems that support this (optional)
979c609719bSwdenk		feature, like the TQM8xxL modules.
980c609719bSwdenk
981c609719bSwdenk- I2C Support:	CONFIG_HARD_I2C | CONFIG_SOFT_I2C
982c609719bSwdenk
983b37c7e5eSwdenk		These enable I2C serial bus commands. Defining either of
984b37c7e5eSwdenk		(but not both of) CONFIG_HARD_I2C or CONFIG_SOFT_I2C will
985b37c7e5eSwdenk		include the appropriate I2C driver for the selected cpu.
986c609719bSwdenk
987b37c7e5eSwdenk		This will allow you to use i2c commands at the u-boot
988b37c7e5eSwdenk		command line (as long as you set CFG_CMD_I2C in
989b37c7e5eSwdenk		CONFIG_COMMANDS) and communicate with i2c based realtime
990b37c7e5eSwdenk		clock chips. See common/cmd_i2c.c for a description of the
991c609719bSwdenk		command line interface.
992c609719bSwdenk
993b37c7e5eSwdenk		CONFIG_HARD_I2C	selects the CPM hardware driver for I2C.
994c609719bSwdenk
995b37c7e5eSwdenk		CONFIG_SOFT_I2C configures u-boot to use a software (aka
996b37c7e5eSwdenk		bit-banging) driver instead of CPM or similar hardware
997b37c7e5eSwdenk		support for I2C.
998c609719bSwdenk
999b37c7e5eSwdenk		There are several other quantities that must also be
1000b37c7e5eSwdenk		defined when you define CONFIG_HARD_I2C or CONFIG_SOFT_I2C.
1001c609719bSwdenk
1002b37c7e5eSwdenk		In both cases you will need to define CFG_I2C_SPEED
1003b37c7e5eSwdenk		to be the frequency (in Hz) at which you wish your i2c bus
1004b37c7e5eSwdenk		to run and CFG_I2C_SLAVE to be the address of this node (ie
1005b37c7e5eSwdenk		the cpu's i2c node address).
1006c609719bSwdenk
1007b37c7e5eSwdenk		Now, the u-boot i2c code for the mpc8xx (cpu/mpc8xx/i2c.c)
1008b37c7e5eSwdenk		sets the cpu up as a master node and so its address should
1009b37c7e5eSwdenk		therefore be cleared to 0 (See, eg, MPC823e User's Manual
1010b37c7e5eSwdenk		p.16-473). So, set CFG_I2C_SLAVE to 0.
1011b37c7e5eSwdenk
1012b37c7e5eSwdenk		That's all that's required for CONFIG_HARD_I2C.
1013b37c7e5eSwdenk
1014b37c7e5eSwdenk		If you use the software i2c interface (CONFIG_SOFT_I2C)
1015b37c7e5eSwdenk		then the following macros need to be defined (examples are
1016b37c7e5eSwdenk		from include/configs/lwmon.h):
1017c609719bSwdenk
1018c609719bSwdenk		I2C_INIT
1019c609719bSwdenk
1020b37c7e5eSwdenk		(Optional). Any commands necessary to enable the I2C
1021c609719bSwdenk		controller or configure ports.
1022c609719bSwdenk
1023b37c7e5eSwdenk		eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |=  PB_SCL)
1024b37c7e5eSwdenk
1025c609719bSwdenk		I2C_PORT
1026c609719bSwdenk
1027c609719bSwdenk		(Only for MPC8260 CPU). The I/O port to use (the code
1028c609719bSwdenk		assumes both bits are on the same port). Valid values
1029c609719bSwdenk		are 0..3 for ports A..D.
1030c609719bSwdenk
1031c609719bSwdenk		I2C_ACTIVE
1032c609719bSwdenk
1033c609719bSwdenk		The code necessary to make the I2C data line active
1034c609719bSwdenk		(driven).  If the data line is open collector, this
1035c609719bSwdenk		define can be null.
1036c609719bSwdenk
1037b37c7e5eSwdenk		eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |=  PB_SDA)
1038b37c7e5eSwdenk
1039c609719bSwdenk		I2C_TRISTATE
1040c609719bSwdenk
1041c609719bSwdenk		The code necessary to make the I2C data line tri-stated
1042c609719bSwdenk		(inactive).  If the data line is open collector, this
1043c609719bSwdenk		define can be null.
1044c609719bSwdenk
1045b37c7e5eSwdenk		eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA)
1046b37c7e5eSwdenk
1047c609719bSwdenk		I2C_READ
1048c609719bSwdenk
1049c609719bSwdenk		Code that returns TRUE if the I2C data line is high,
1050c609719bSwdenk		FALSE if it is low.
1051c609719bSwdenk
1052b37c7e5eSwdenk		eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0)
1053b37c7e5eSwdenk
1054c609719bSwdenk		I2C_SDA(bit)
1055c609719bSwdenk
1056c609719bSwdenk		If <bit> is TRUE, sets the I2C data line high. If it
1057c609719bSwdenk		is FALSE, it clears it (low).
1058c609719bSwdenk
1059b37c7e5eSwdenk		eg: #define I2C_SDA(bit) \
1060b37c7e5eSwdenk			if(bit) immr->im_cpm.cp_pbdat |=  PB_SDA; \
1061b37c7e5eSwdenk			else    immr->im_cpm.cp_pbdat &= ~PB_SDA
1062b37c7e5eSwdenk
1063c609719bSwdenk		I2C_SCL(bit)
1064c609719bSwdenk
1065c609719bSwdenk		If <bit> is TRUE, sets the I2C clock line high. If it
1066c609719bSwdenk		is FALSE, it clears it (low).
1067c609719bSwdenk
1068b37c7e5eSwdenk		eg: #define I2C_SCL(bit) \
1069b37c7e5eSwdenk			if(bit) immr->im_cpm.cp_pbdat |=  PB_SCL; \
1070b37c7e5eSwdenk			else    immr->im_cpm.cp_pbdat &= ~PB_SCL
1071b37c7e5eSwdenk
1072c609719bSwdenk		I2C_DELAY
1073c609719bSwdenk
1074c609719bSwdenk		This delay is invoked four times per clock cycle so this
1075c609719bSwdenk		controls the rate of data transfer.  The data rate thus
1076b37c7e5eSwdenk		is 1 / (I2C_DELAY * 4). Often defined to be something
1077b37c7e5eSwdenk		like:
1078b37c7e5eSwdenk
1079b37c7e5eSwdenk		#define I2C_DELAY  udelay(2)
1080c609719bSwdenk
108147cd00faSwdenk		CFG_I2C_INIT_BOARD
108247cd00faSwdenk
108347cd00faSwdenk		When a board is reset during an i2c bus transfer
108447cd00faSwdenk		chips might think that the current transfer is still
108547cd00faSwdenk		in progress. On some boards it is possible to access
108647cd00faSwdenk		the i2c SCLK line directly, either by using the
108747cd00faSwdenk		processor pin as a GPIO or by having a second pin
108847cd00faSwdenk		connected to the bus. If this option is defined a
108947cd00faSwdenk		custom i2c_init_board() routine in boards/xxx/board.c
109047cd00faSwdenk		is run early in the boot sequence.
109147cd00faSwdenk
1092c609719bSwdenk- SPI Support:	CONFIG_SPI
1093c609719bSwdenk
1094c609719bSwdenk		Enables SPI driver (so far only tested with
1095c609719bSwdenk		SPI EEPROM, also an instance works with Crystal A/D and
1096c609719bSwdenk		D/As on the SACSng board)
1097c609719bSwdenk
1098c609719bSwdenk		CONFIG_SPI_X
1099c609719bSwdenk
1100c609719bSwdenk		Enables extended (16-bit) SPI EEPROM addressing.
1101c609719bSwdenk		(symmetrical to CONFIG_I2C_X)
1102c609719bSwdenk
1103c609719bSwdenk		CONFIG_SOFT_SPI
1104c609719bSwdenk
1105c609719bSwdenk		Enables a software (bit-bang) SPI driver rather than
1106c609719bSwdenk		using hardware support. This is a general purpose
1107c609719bSwdenk		driver that only requires three general I/O port pins
1108c609719bSwdenk		(two outputs, one input) to function. If this is
1109c609719bSwdenk		defined, the board configuration must define several
1110c609719bSwdenk		SPI configuration items (port pins to use, etc). For
1111c609719bSwdenk		an example, see include/configs/sacsng.h.
1112c609719bSwdenk
1113c609719bSwdenk- FPGA Support: CONFIG_FPGA_COUNT
1114c609719bSwdenk
1115c609719bSwdenk		Specify the number of FPGA devices to support.
1116c609719bSwdenk
1117c609719bSwdenk		CONFIG_FPGA
1118c609719bSwdenk
1119c609719bSwdenk		Used to specify the types of FPGA devices. For
1120c609719bSwdenk		example,
1121c609719bSwdenk		#define CONFIG_FPGA  CFG_XILINX_VIRTEX2
1122c609719bSwdenk
1123c609719bSwdenk		CFG_FPGA_PROG_FEEDBACK
1124c609719bSwdenk
1125c609719bSwdenk		Enable printing of hash marks during FPGA
1126c609719bSwdenk		configuration.
1127c609719bSwdenk
1128c609719bSwdenk		CFG_FPGA_CHECK_BUSY
1129c609719bSwdenk
1130c609719bSwdenk		Enable checks on FPGA configuration interface busy
1131c609719bSwdenk		status by the configuration function. This option
1132c609719bSwdenk		will require a board or device specific function to
1133c609719bSwdenk		be written.
1134c609719bSwdenk
1135c609719bSwdenk		CONFIG_FPGA_DELAY
1136c609719bSwdenk
1137c609719bSwdenk		If defined, a function that provides delays in the
1138c609719bSwdenk		FPGA configuration driver.
1139c609719bSwdenk
1140c609719bSwdenk		CFG_FPGA_CHECK_CTRLC
1141c609719bSwdenk
1142c609719bSwdenk		Allow Control-C to interrupt FPGA configuration
1143c609719bSwdenk
1144c609719bSwdenk		CFG_FPGA_CHECK_ERROR
1145c609719bSwdenk
1146c609719bSwdenk		Check for configuration errors during FPGA bitfile
1147c609719bSwdenk		loading. For example, abort during Virtex II
1148c609719bSwdenk		configuration if the INIT_B line goes low (which
1149c609719bSwdenk		indicated a CRC error).
1150c609719bSwdenk
1151c609719bSwdenk		CFG_FPGA_WAIT_INIT
1152c609719bSwdenk
1153c609719bSwdenk		Maximum time to wait for the INIT_B line to deassert
1154c609719bSwdenk		after PROB_B has been deasserted during a Virtex II
1155c609719bSwdenk		FPGA configuration sequence. The default time is 500 mS.
1156c609719bSwdenk
1157c609719bSwdenk		CFG_FPGA_WAIT_BUSY
1158c609719bSwdenk
1159c609719bSwdenk		Maximum time to wait for BUSY to deassert during
1160c609719bSwdenk		Virtex II FPGA configuration. The default is 5 mS.
1161c609719bSwdenk
1162c609719bSwdenk		CFG_FPGA_WAIT_CONFIG
1163c609719bSwdenk
1164c609719bSwdenk		Time to wait after FPGA configuration. The default is
1165c609719bSwdenk		200 mS.
1166c609719bSwdenk
1167c609719bSwdenk- FPGA Support:	CONFIG_FPGA_COUNT
1168c609719bSwdenk
1169c609719bSwdenk		Specify the number of FPGA devices to support.
1170c609719bSwdenk
1171c609719bSwdenk		CONFIG_FPGA
1172c609719bSwdenk
1173c609719bSwdenk		Used to specify the types of FPGA devices.  For example,
1174c609719bSwdenk		#define CONFIG_FPGA  CFG_XILINX_VIRTEX2
1175c609719bSwdenk
1176c609719bSwdenk		CFG_FPGA_PROG_FEEDBACK
1177c609719bSwdenk
1178c609719bSwdenk		Enable printing of hash marks during FPGA configuration.
1179c609719bSwdenk
1180c609719bSwdenk		CFG_FPGA_CHECK_BUSY
1181c609719bSwdenk
1182c609719bSwdenk		Enable checks on FPGA configuration interface busy
1183c609719bSwdenk		status by the configuration function. This option
1184c609719bSwdenk		will require a board or device specific function to
1185c609719bSwdenk		be written.
1186c609719bSwdenk
1187c609719bSwdenk		CONFIG_FPGA_DELAY
1188c609719bSwdenk
1189c609719bSwdenk		If defined, a function that provides delays in the FPGA
1190c609719bSwdenk		configuration driver.
1191c609719bSwdenk
1192c609719bSwdenk		CFG_FPGA_CHECK_CTRLC
1193c609719bSwdenk		Allow Control-C to interrupt FPGA configuration
1194c609719bSwdenk
1195c609719bSwdenk		CFG_FPGA_CHECK_ERROR
1196c609719bSwdenk
1197c609719bSwdenk		Check for configuration errors during FPGA bitfile
1198c609719bSwdenk		loading. For example, abort during Virtex II
1199c609719bSwdenk		configuration if the INIT_B line goes low (which
1200c609719bSwdenk		indicated a CRC error).
1201c609719bSwdenk
1202c609719bSwdenk		CFG_FPGA_WAIT_INIT
1203c609719bSwdenk
1204c609719bSwdenk		Maximum time to wait for the INIT_B line to deassert
1205c609719bSwdenk		after PROB_B has been deasserted during a Virtex II
1206c609719bSwdenk		FPGA configuration sequence. The default time is 500
1207c609719bSwdenk		mS.
1208c609719bSwdenk
1209c609719bSwdenk		CFG_FPGA_WAIT_BUSY
1210c609719bSwdenk
1211c609719bSwdenk		Maximum time to wait for BUSY to deassert during
1212c609719bSwdenk		Virtex II FPGA configuration. The default is 5 mS.
1213c609719bSwdenk
1214c609719bSwdenk		CFG_FPGA_WAIT_CONFIG
1215c609719bSwdenk
1216c609719bSwdenk		Time to wait after FPGA configuration. The default is
1217c609719bSwdenk		200 mS.
1218c609719bSwdenk
1219c609719bSwdenk- Configuration Management:
1220c609719bSwdenk		CONFIG_IDENT_STRING
1221c609719bSwdenk
1222c609719bSwdenk		If defined, this string will be added to the U-Boot
1223c609719bSwdenk		version information (U_BOOT_VERSION)
1224c609719bSwdenk
1225c609719bSwdenk- Vendor Parameter Protection:
1226c609719bSwdenk
1227c609719bSwdenk		U-Boot considers the values of the environment
1228c609719bSwdenk		variables "serial#" (Board Serial Number) and
12297152b1d0Swdenk		"ethaddr" (Ethernet Address) to be parameters that
1230c609719bSwdenk		are set once by the board vendor / manufacturer, and
1231c609719bSwdenk		protects these variables from casual modification by
1232c609719bSwdenk		the user. Once set, these variables are read-only,
1233c609719bSwdenk		and write or delete attempts are rejected. You can
1234c609719bSwdenk		change this behviour:
1235c609719bSwdenk
1236c609719bSwdenk		If CONFIG_ENV_OVERWRITE is #defined in your config
1237c609719bSwdenk		file, the write protection for vendor parameters is
123847cd00faSwdenk		completely disabled. Anybody can change or delete
1239c609719bSwdenk		these parameters.
1240c609719bSwdenk
1241c609719bSwdenk		Alternatively, if you #define _both_ CONFIG_ETHADDR
1242c609719bSwdenk		_and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default
1243c609719bSwdenk		ethernet address is installed in the environment,
1244c609719bSwdenk		which can be changed exactly ONCE by the user. [The
1245c609719bSwdenk		serial# is unaffected by this, i. e. it remains
1246c609719bSwdenk		read-only.]
1247c609719bSwdenk
1248c609719bSwdenk- Protected RAM:
1249c609719bSwdenk		CONFIG_PRAM
1250c609719bSwdenk
1251c609719bSwdenk		Define this variable to enable the reservation of
1252c609719bSwdenk		"protected RAM", i. e. RAM which is not overwritten
1253c609719bSwdenk		by U-Boot. Define CONFIG_PRAM to hold the number of
1254c609719bSwdenk		kB you want to reserve for pRAM. You can overwrite
1255c609719bSwdenk		this default value by defining an environment
1256c609719bSwdenk		variable "pram" to the number of kB you want to
1257c609719bSwdenk		reserve. Note that the board info structure will
1258c609719bSwdenk		still show the full amount of RAM. If pRAM is
1259c609719bSwdenk		reserved, a new environment variable "mem" will
1260c609719bSwdenk		automatically be defined to hold the amount of
1261c609719bSwdenk		remaining RAM in a form that can be passed as boot
1262c609719bSwdenk		argument to Linux, for instance like that:
1263c609719bSwdenk
1264c609719bSwdenk			setenv bootargs ... mem=\$(mem)
1265c609719bSwdenk			saveenv
1266c609719bSwdenk
1267c609719bSwdenk		This way you can tell Linux not to use this memory,
1268c609719bSwdenk		either, which results in a memory region that will
1269c609719bSwdenk		not be affected by reboots.
1270c609719bSwdenk
1271c609719bSwdenk		*WARNING* If your board configuration uses automatic
1272c609719bSwdenk		detection of the RAM size, you must make sure that
1273c609719bSwdenk		this memory test is non-destructive. So far, the
1274c609719bSwdenk		following board configurations are known to be
1275c609719bSwdenk		"pRAM-clean":
1276c609719bSwdenk
1277c609719bSwdenk			ETX094, IVMS8, IVML24, SPD8xx, TQM8xxL,
1278c609719bSwdenk			HERMES, IP860, RPXlite, LWMON, LANTEC,
1279c609719bSwdenk			PCU_E, FLAGADM, TQM8260
1280c609719bSwdenk
1281c609719bSwdenk- Error Recovery:
1282c609719bSwdenk		CONFIG_PANIC_HANG
1283c609719bSwdenk
1284c609719bSwdenk		Define this variable to stop the system in case of a
1285c609719bSwdenk		fatal error, so that you have to reset it manually.
1286c609719bSwdenk		This is probably NOT a good idea for an embedded
1287c609719bSwdenk		system where you want to system to reboot
1288c609719bSwdenk		automatically as fast as possible, but it may be
1289c609719bSwdenk		useful during development since you can try to debug
1290c609719bSwdenk		the conditions that lead to the situation.
1291c609719bSwdenk
1292c609719bSwdenk		CONFIG_NET_RETRY_COUNT
1293c609719bSwdenk
1294c609719bSwdenk		This variable defines the number of retries for
1295c609719bSwdenk		network operations like ARP, RARP, TFTP, or BOOTP
1296c609719bSwdenk		before giving up the operation. If not defined, a
1297c609719bSwdenk		default value of 5 is used.
1298c609719bSwdenk
1299c609719bSwdenk- Command Interpreter:
1300c609719bSwdenk		CFG_HUSH_PARSER
1301c609719bSwdenk
1302c609719bSwdenk		Define this variable to enable the "hush" shell (from
1303c609719bSwdenk		Busybox) as command line interpreter, thus enabling
1304c609719bSwdenk		powerful command line syntax like
1305c609719bSwdenk		if...then...else...fi conditionals or `&&' and '||'
1306c609719bSwdenk		constructs ("shell scripts").
1307c609719bSwdenk
1308c609719bSwdenk		If undefined, you get the old, much simpler behaviour
1309c609719bSwdenk		with a somewhat smaller memory footprint.
1310c609719bSwdenk
1311c609719bSwdenk
1312c609719bSwdenk		CFG_PROMPT_HUSH_PS2
1313c609719bSwdenk
1314c609719bSwdenk		This defines the secondary prompt string, which is
1315c609719bSwdenk		printed when the command interpreter needs more input
1316c609719bSwdenk		to complete a command. Usually "> ".
1317c609719bSwdenk
1318c609719bSwdenk	Note:
1319c609719bSwdenk
1320c609719bSwdenk		In the current implementation, the local variables
1321c609719bSwdenk		space and global environment variables space are
1322c609719bSwdenk		separated. Local variables are those you define by
13233b57fe0aSwdenk		simply typing `name=value'. To access a local
1324c609719bSwdenk		variable later on, you have write `$name' or
13253b57fe0aSwdenk		`${name}'; to execute the contents of a variable
13263b57fe0aSwdenk		directly type `$name' at the command prompt.
1327c609719bSwdenk
1328c609719bSwdenk		Global environment variables are those you use
1329c609719bSwdenk		setenv/printenv to work with. To run a command stored
1330c609719bSwdenk		in such a variable, you need to use the run command,
1331c609719bSwdenk		and you must not use the '$' sign to access them.
1332c609719bSwdenk
1333c609719bSwdenk		To store commands and special characters in a
1334c609719bSwdenk		variable, please use double quotation marks
1335c609719bSwdenk		surrounding the whole text of the variable, instead
1336c609719bSwdenk		of the backslashes before semicolons and special
1337c609719bSwdenk		symbols.
1338c609719bSwdenk
1339c609719bSwdenk- Default Environment
1340c609719bSwdenk		CONFIG_EXTRA_ENV_SETTINGS
1341c609719bSwdenk
1342c609719bSwdenk		Define this to contain any number of null terminated
1343c609719bSwdenk		strings (variable = value pairs) that will be part of
13447152b1d0Swdenk		the default environment compiled into the boot image.
13452262cfeeSwdenk
1346c609719bSwdenk		For example, place something like this in your
1347c609719bSwdenk		board's config file:
1348c609719bSwdenk
1349c609719bSwdenk		#define CONFIG_EXTRA_ENV_SETTINGS \
1350c609719bSwdenk			"myvar1=value1\0" \
1351c609719bSwdenk			"myvar2=value2\0"
1352c609719bSwdenk
1353c609719bSwdenk		Warning: This method is based on knowledge about the
1354c609719bSwdenk		internal format how the environment is stored by the
13552262cfeeSwdenk		U-Boot code. This is NOT an official, exported
1356c609719bSwdenk		interface! Although it is unlikely that this format
13577152b1d0Swdenk		will change soon, there is no guarantee either.
1358c609719bSwdenk		You better know what you are doing here.
1359c609719bSwdenk
1360c609719bSwdenk		Note: overly (ab)use of the default environment is
1361c609719bSwdenk		discouraged. Make sure to check other ways to preset
1362c609719bSwdenk		the environment like the autoscript function or the
1363c609719bSwdenk		boot command first.
1364c609719bSwdenk
13652abbe075Swdenk- DataFlash Support
13662abbe075Swdenk		CONFIG_HAS_DATAFLASH
13672abbe075Swdenk
13682abbe075Swdenk		Defining this option enables DataFlash features and
13692abbe075Swdenk		allows to read/write in Dataflash via the standard
13702abbe075Swdenk		commands cp, md...
13712abbe075Swdenk
1372c609719bSwdenk- Show boot progress
1373c609719bSwdenk		CONFIG_SHOW_BOOT_PROGRESS
1374c609719bSwdenk
1375c609719bSwdenk		Defining this option allows to add some board-
1376c609719bSwdenk		specific code (calling a user-provided function
1377c609719bSwdenk		"show_boot_progress(int)") that enables you to show
1378c609719bSwdenk		the system's boot progress on some display (for
1379c609719bSwdenk		example, some LED's) on your board. At the moment,
1380c609719bSwdenk		the following checkpoints are implemented:
1381c609719bSwdenk
1382c609719bSwdenk  Arg	Where			When
1383c609719bSwdenk    1	common/cmd_bootm.c	before attempting to boot an image
1384c609719bSwdenk   -1	common/cmd_bootm.c	Image header has bad     magic number
1385c609719bSwdenk    2	common/cmd_bootm.c	Image header has correct magic number
1386c609719bSwdenk   -2	common/cmd_bootm.c	Image header has bad     checksum
1387c609719bSwdenk    3	common/cmd_bootm.c	Image header has correct checksum
1388c609719bSwdenk   -3	common/cmd_bootm.c	Image data   has bad     checksum
1389c609719bSwdenk    4	common/cmd_bootm.c	Image data   has correct checksum
1390c609719bSwdenk   -4	common/cmd_bootm.c	Image is for unsupported architecture
1391c609719bSwdenk    5	common/cmd_bootm.c	Architecture check OK
1392c609719bSwdenk   -5	common/cmd_bootm.c	Wrong Image Type (not kernel, multi, standalone)
1393c609719bSwdenk    6	common/cmd_bootm.c	Image Type check OK
1394c609719bSwdenk   -6	common/cmd_bootm.c	gunzip uncompression error
1395c609719bSwdenk   -7	common/cmd_bootm.c	Unimplemented compression type
1396c609719bSwdenk    7	common/cmd_bootm.c	Uncompression OK
1397c609719bSwdenk   -8	common/cmd_bootm.c	Wrong Image Type (not kernel, multi, standalone)
1398c609719bSwdenk    8	common/cmd_bootm.c	Image Type check OK
1399c609719bSwdenk   -9	common/cmd_bootm.c	Unsupported OS (not Linux, BSD, VxWorks, QNX)
1400c609719bSwdenk    9	common/cmd_bootm.c	Start initial ramdisk verification
1401c609719bSwdenk  -10	common/cmd_bootm.c	Ramdisk header has bad     magic number
1402c609719bSwdenk  -11	common/cmd_bootm.c	Ramdisk header has bad     checksum
1403c609719bSwdenk   10	common/cmd_bootm.c	Ramdisk header is OK
1404c609719bSwdenk  -12	common/cmd_bootm.c	Ramdisk data   has bad     checksum
1405c609719bSwdenk   11	common/cmd_bootm.c	Ramdisk data   has correct checksum
1406c609719bSwdenk   12	common/cmd_bootm.c	Ramdisk verification complete, start loading
1407c609719bSwdenk  -13	common/cmd_bootm.c	Wrong Image Type (not PPC Linux Ramdisk)
1408c609719bSwdenk   13	common/cmd_bootm.c	Start multifile image verification
1409c609719bSwdenk   14	common/cmd_bootm.c	No initial ramdisk, no multifile, continue.
1410c609719bSwdenk   15	common/cmd_bootm.c	All preparation done, transferring control to OS
1411c609719bSwdenk
1412c609719bSwdenk   -1	common/cmd_doc.c	Bad usage of "doc" command
1413c609719bSwdenk   -1	common/cmd_doc.c	No boot device
1414c609719bSwdenk   -1	common/cmd_doc.c	Unknown Chip ID on boot device
1415c609719bSwdenk   -1	common/cmd_doc.c	Read Error on boot device
1416c609719bSwdenk   -1	common/cmd_doc.c	Image header has bad magic number
1417c609719bSwdenk
1418c609719bSwdenk   -1	common/cmd_ide.c	Bad usage of "ide" command
1419c609719bSwdenk   -1	common/cmd_ide.c	No boot device
1420c609719bSwdenk   -1	common/cmd_ide.c	Unknown boot device
1421c609719bSwdenk   -1	common/cmd_ide.c	Unknown partition table
1422c609719bSwdenk   -1	common/cmd_ide.c	Invalid partition type
1423c609719bSwdenk   -1	common/cmd_ide.c	Read Error on boot device
1424c609719bSwdenk   -1	common/cmd_ide.c	Image header has bad magic number
1425c609719bSwdenk
1426206c60cbSwdenk   -1	common/cmd_nand.c	Bad usage of "nand" command
1427206c60cbSwdenk   -1	common/cmd_nand.c	No boot device
1428206c60cbSwdenk   -1	common/cmd_nand.c	Unknown Chip ID on boot device
1429206c60cbSwdenk   -1	common/cmd_nand.c	Read Error on boot device
1430206c60cbSwdenk   -1	common/cmd_nand.c	Image header has bad magic number
1431206c60cbSwdenk
1432206c60cbSwdenk   -1	common/env_common.c     Environment has a bad CRC, using default
1433c609719bSwdenk
1434c609719bSwdenk
1435c609719bSwdenkModem Support:
1436c609719bSwdenk--------------
1437c609719bSwdenk
143885ec0bccSwdenk[so far only for SMDK2400 and TRAB boards]
1439c609719bSwdenk
1440c609719bSwdenk- Modem support endable:
1441c609719bSwdenk		CONFIG_MODEM_SUPPORT
1442c609719bSwdenk
1443c609719bSwdenk- RTS/CTS Flow control enable:
1444c609719bSwdenk		CONFIG_HWFLOW
1445c609719bSwdenk
1446c609719bSwdenk- Modem debug support:
1447c609719bSwdenk		CONFIG_MODEM_SUPPORT_DEBUG
1448c609719bSwdenk
1449c609719bSwdenk		Enables debugging stuff (char screen[1024], dbg())
1450c609719bSwdenk		for modem support. Useful only with BDI2000.
1451c609719bSwdenk
1452c609719bSwdenk- General:
1453c609719bSwdenk
1454c609719bSwdenk		In the target system modem support is enabled when a
1455c609719bSwdenk		specific key (key combination) is pressed during
1456c609719bSwdenk		power-on. Otherwise U-Boot will boot normally
1457c609719bSwdenk		(autoboot). The key_pressed() fuction is called from
1458c609719bSwdenk		board_init(). Currently key_pressed() is a dummy
1459c609719bSwdenk		function, returning 1 and thus enabling modem
1460c609719bSwdenk		initialization.
1461c609719bSwdenk
1462c609719bSwdenk		If there are no modem init strings in the
1463c609719bSwdenk		environment, U-Boot proceed to autoboot; the
1464c609719bSwdenk		previous output (banner, info printfs) will be
1465c609719bSwdenk		supressed, though.
1466c609719bSwdenk
1467c609719bSwdenk		See also: doc/README.Modem
1468c609719bSwdenk
1469c609719bSwdenk
1470c609719bSwdenkConfiguration Settings:
1471c609719bSwdenk-----------------------
1472c609719bSwdenk
1473c609719bSwdenk- CFG_LONGHELP: Defined when you want long help messages included;
1474c609719bSwdenk		undefine this when you're short of memory.
1475c609719bSwdenk
1476c609719bSwdenk- CFG_PROMPT:	This is what U-Boot prints on the console to
1477c609719bSwdenk		prompt for user input.
1478c609719bSwdenk
1479c609719bSwdenk- CFG_CBSIZE:	Buffer size for input from the Console
1480c609719bSwdenk
1481c609719bSwdenk- CFG_PBSIZE:	Buffer size for Console output
1482c609719bSwdenk
1483c609719bSwdenk- CFG_MAXARGS:	max. Number of arguments accepted for monitor commands
1484c609719bSwdenk
1485c609719bSwdenk- CFG_BARGSIZE: Buffer size for Boot Arguments which are passed to
1486c609719bSwdenk		the application (usually a Linux kernel) when it is
1487c609719bSwdenk		booted
1488c609719bSwdenk
1489c609719bSwdenk- CFG_BAUDRATE_TABLE:
1490c609719bSwdenk		List of legal baudrate settings for this board.
1491c609719bSwdenk
1492c609719bSwdenk- CFG_CONSOLE_INFO_QUIET
1493c609719bSwdenk		Suppress display of console information at boot.
1494c609719bSwdenk
1495c609719bSwdenk- CFG_CONSOLE_IS_IN_ENV
1496c609719bSwdenk		If the board specific function
1497c609719bSwdenk			extern int overwrite_console (void);
1498c609719bSwdenk		returns 1, the stdin, stderr and stdout are switched to the
1499c609719bSwdenk		serial port, else the settings in the environment are used.
1500c609719bSwdenk
1501c609719bSwdenk- CFG_CONSOLE_OVERWRITE_ROUTINE
1502c609719bSwdenk		Enable the call to overwrite_console().
1503c609719bSwdenk
1504c609719bSwdenk- CFG_CONSOLE_ENV_OVERWRITE
1505c609719bSwdenk		Enable overwrite of previous console environment settings.
1506c609719bSwdenk
1507c609719bSwdenk- CFG_MEMTEST_START, CFG_MEMTEST_END:
1508c609719bSwdenk		Begin and End addresses of the area used by the
1509c609719bSwdenk		simple memory test.
1510c609719bSwdenk
1511c609719bSwdenk- CFG_ALT_MEMTEST:
1512c609719bSwdenk		Enable an alternate, more extensive memory test.
1513c609719bSwdenk
15145f535fe1Swdenk- CFG_MEMTEST_SCRATCH:
15155f535fe1Swdenk		Scratch address used by the alternate memory test
15165f535fe1Swdenk		You only need to set this if address zero isn't writeable
15175f535fe1Swdenk
1518c609719bSwdenk- CFG_TFTP_LOADADDR:
1519c609719bSwdenk		Default load address for network file downloads
1520c609719bSwdenk
1521c609719bSwdenk- CFG_LOADS_BAUD_CHANGE:
1522c609719bSwdenk		Enable temporary baudrate change while serial download
1523c609719bSwdenk
1524c609719bSwdenk- CFG_SDRAM_BASE:
1525c609719bSwdenk		Physical start address of SDRAM. _Must_ be 0 here.
1526c609719bSwdenk
1527c609719bSwdenk- CFG_MBIO_BASE:
1528c609719bSwdenk		Physical start address of Motherboard I/O (if using a
1529c609719bSwdenk		Cogent motherboard)
1530c609719bSwdenk
1531c609719bSwdenk- CFG_FLASH_BASE:
1532c609719bSwdenk		Physical start address of Flash memory.
1533c609719bSwdenk
1534c609719bSwdenk- CFG_MONITOR_BASE:
1535c609719bSwdenk		Physical start address of boot monitor code (set by
1536c609719bSwdenk		make config files to be same as the text base address
1537c609719bSwdenk		(TEXT_BASE) used when linking) - same as
1538c609719bSwdenk		CFG_FLASH_BASE when booting from flash.
1539c609719bSwdenk
1540c609719bSwdenk- CFG_MONITOR_LEN:
15413b57fe0aSwdenk		Size of memory reserved for monitor code, used to
15423b57fe0aSwdenk		determine _at_compile_time_ (!) if the environment is
15433b57fe0aSwdenk		embedded within the U-Boot image, or in a separate
15443b57fe0aSwdenk		flash sector.
1545c609719bSwdenk
1546c609719bSwdenk- CFG_MALLOC_LEN:
1547c609719bSwdenk		Size of DRAM reserved for malloc() use.
1548c609719bSwdenk
1549c609719bSwdenk- CFG_BOOTMAPSZ:
1550c609719bSwdenk		Maximum size of memory mapped by the startup code of
1551c609719bSwdenk		the Linux kernel; all data that must be processed by
1552c609719bSwdenk		the Linux kernel (bd_info, boot arguments, eventually
1553c609719bSwdenk		initrd image) must be put below this limit.
1554c609719bSwdenk
1555c609719bSwdenk- CFG_MAX_FLASH_BANKS:
1556c609719bSwdenk		Max number of Flash memory banks
1557c609719bSwdenk
1558c609719bSwdenk- CFG_MAX_FLASH_SECT:
1559c609719bSwdenk		Max number of sectors on a Flash chip
1560c609719bSwdenk
1561c609719bSwdenk- CFG_FLASH_ERASE_TOUT:
1562c609719bSwdenk		Timeout for Flash erase operations (in ms)
1563c609719bSwdenk
1564c609719bSwdenk- CFG_FLASH_WRITE_TOUT:
1565c609719bSwdenk		Timeout for Flash write operations (in ms)
1566c609719bSwdenk
15678564acf9Swdenk- CFG_FLASH_LOCK_TOUT
15688564acf9Swdenk		Timeout for Flash set sector lock bit operation (in ms)
15698564acf9Swdenk
15708564acf9Swdenk- CFG_FLASH_UNLOCK_TOUT
15718564acf9Swdenk		Timeout for Flash clear lock bits operation (in ms)
15728564acf9Swdenk
15738564acf9Swdenk- CFG_FLASH_PROTECTION
15748564acf9Swdenk		If defined, hardware flash sectors protection is used
15758564acf9Swdenk		instead of U-Boot software protection.
15768564acf9Swdenk
1577c609719bSwdenk- CFG_DIRECT_FLASH_TFTP:
1578c609719bSwdenk
1579c609719bSwdenk		Enable TFTP transfers directly to flash memory;
1580c609719bSwdenk		without this option such a download has to be
1581c609719bSwdenk		performed in two steps: (1) download to RAM, and (2)
1582c609719bSwdenk		copy from RAM to flash.
1583c609719bSwdenk
1584c609719bSwdenk		The two-step approach is usually more reliable, since
1585c609719bSwdenk		you can check if the download worked before you erase
1586c609719bSwdenk		the flash, but in some situations (when sytem RAM is
1587c609719bSwdenk		too limited to allow for a tempory copy of the
1588c609719bSwdenk		downloaded image) this option may be very useful.
1589c609719bSwdenk
1590c609719bSwdenk- CFG_FLASH_CFI:
1591c609719bSwdenk		Define if the flash driver uses extra elements in the
1592c609719bSwdenk		common flash structure for storing flash geometry
159353cf9435Sstroese
159453cf9435Sstroese- CFG_RX_ETH_BUFFER:
159553cf9435Sstroese		Defines the number of ethernet receive buffers. On some
159653cf9435Sstroese		ethernet controllers it is recommended to set this value
159753cf9435Sstroese		to 8 or even higher (EEPRO100 or 405 EMAC), since all
159853cf9435Sstroese		buffers can be full shortly after enabling the interface
159953cf9435Sstroese		on high ethernet traffic.
160053cf9435Sstroese		Defaults to 4 if not defined.
1601c609719bSwdenk
1602c609719bSwdenkThe following definitions that deal with the placement and management
1603c609719bSwdenkof environment data (variable area); in general, we support the
1604c609719bSwdenkfollowing configurations:
1605c609719bSwdenk
1606c609719bSwdenk- CFG_ENV_IS_IN_FLASH:
1607c609719bSwdenk
1608c609719bSwdenk	Define this if the environment is in flash memory.
1609c609719bSwdenk
1610c609719bSwdenk	a) The environment occupies one whole flash sector, which is
1611c609719bSwdenk	   "embedded" in the text segment with the U-Boot code. This
1612c609719bSwdenk	   happens usually with "bottom boot sector" or "top boot
1613c609719bSwdenk	   sector" type flash chips, which have several smaller
1614c609719bSwdenk	   sectors at the start or the end. For instance, such a
1615c609719bSwdenk	   layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In
1616c609719bSwdenk	   such a case you would place the environment in one of the
1617c609719bSwdenk	   4 kB sectors - with U-Boot code before and after it. With
1618c609719bSwdenk	   "top boot sector" type flash chips, you would put the
1619c609719bSwdenk	   environment in one of the last sectors, leaving a gap
1620c609719bSwdenk	   between U-Boot and the environment.
1621c609719bSwdenk
1622c609719bSwdenk	- CFG_ENV_OFFSET:
1623c609719bSwdenk
1624c609719bSwdenk	   Offset of environment data (variable area) to the
1625c609719bSwdenk	   beginning of flash memory; for instance, with bottom boot
1626c609719bSwdenk	   type flash chips the second sector can be used: the offset
1627c609719bSwdenk	   for this sector is given here.
1628c609719bSwdenk
1629c609719bSwdenk	   CFG_ENV_OFFSET is used relative to CFG_FLASH_BASE.
1630c609719bSwdenk
1631c609719bSwdenk	- CFG_ENV_ADDR:
1632c609719bSwdenk
1633c609719bSwdenk	   This is just another way to specify the start address of
1634c609719bSwdenk	   the flash sector containing the environment (instead of
1635c609719bSwdenk	   CFG_ENV_OFFSET).
1636c609719bSwdenk
1637c609719bSwdenk	- CFG_ENV_SECT_SIZE:
1638c609719bSwdenk
1639c609719bSwdenk	   Size of the sector containing the environment.
1640c609719bSwdenk
1641c609719bSwdenk
1642c609719bSwdenk	b) Sometimes flash chips have few, equal sized, BIG sectors.
1643c609719bSwdenk	   In such a case you don't want to spend a whole sector for
1644c609719bSwdenk	   the environment.
1645c609719bSwdenk
1646c609719bSwdenk	- CFG_ENV_SIZE:
1647c609719bSwdenk
1648c609719bSwdenk	   If you use this in combination with CFG_ENV_IS_IN_FLASH
1649c609719bSwdenk	   and CFG_ENV_SECT_SIZE, you can specify to use only a part
1650c609719bSwdenk	   of this flash sector for the environment. This saves
1651c609719bSwdenk	   memory for the RAM copy of the environment.
1652c609719bSwdenk
1653c609719bSwdenk	   It may also save flash memory if you decide to use this
1654c609719bSwdenk	   when your environment is "embedded" within U-Boot code,
1655c609719bSwdenk	   since then the remainder of the flash sector could be used
1656c609719bSwdenk	   for U-Boot code. It should be pointed out that this is
1657c609719bSwdenk	   STRONGLY DISCOURAGED from a robustness point of view:
1658c609719bSwdenk	   updating the environment in flash makes it always
1659c609719bSwdenk	   necessary to erase the WHOLE sector. If something goes
1660c609719bSwdenk	   wrong before the contents has been restored from a copy in
1661c609719bSwdenk	   RAM, your target system will be dead.
1662c609719bSwdenk
1663c609719bSwdenk	- CFG_ENV_ADDR_REDUND
1664c609719bSwdenk	  CFG_ENV_SIZE_REDUND
1665c609719bSwdenk
1666c609719bSwdenk	   These settings describe a second storage area used to hold
1667c609719bSwdenk	   a redundand copy of the environment data, so that there is
16683e38691eSwdenk	   a valid backup copy in case there is a power failure during
1669c609719bSwdenk	   a "saveenv" operation.
1670c609719bSwdenk
1671c609719bSwdenkBE CAREFUL! Any changes to the flash layout, and some changes to the
1672c609719bSwdenksource code will make it necessary to adapt <board>/u-boot.lds*
1673c609719bSwdenkaccordingly!
1674c609719bSwdenk
1675c609719bSwdenk
1676c609719bSwdenk- CFG_ENV_IS_IN_NVRAM:
1677c609719bSwdenk
1678c609719bSwdenk	Define this if you have some non-volatile memory device
1679c609719bSwdenk	(NVRAM, battery buffered SRAM) which you want to use for the
1680c609719bSwdenk	environment.
1681c609719bSwdenk
1682c609719bSwdenk	- CFG_ENV_ADDR:
1683c609719bSwdenk	- CFG_ENV_SIZE:
1684c609719bSwdenk
1685c609719bSwdenk	  These two #defines are used to determin the memory area you
1686c609719bSwdenk	  want to use for environment. It is assumed that this memory
1687c609719bSwdenk	  can just be read and written to, without any special
1688c609719bSwdenk	  provision.
1689c609719bSwdenk
1690c609719bSwdenkBE CAREFUL! The first access to the environment happens quite early
1691c609719bSwdenkin U-Boot initalization (when we try to get the setting of for the
1692c609719bSwdenkconsole baudrate). You *MUST* have mappend your NVRAM area then, or
1693c609719bSwdenkU-Boot will hang.
1694c609719bSwdenk
1695c609719bSwdenkPlease note that even with NVRAM we still use a copy of the
1696c609719bSwdenkenvironment in RAM: we could work on NVRAM directly, but we want to
1697c609719bSwdenkkeep settings there always unmodified except somebody uses "saveenv"
1698c609719bSwdenkto save the current settings.
1699c609719bSwdenk
1700c609719bSwdenk
1701c609719bSwdenk- CFG_ENV_IS_IN_EEPROM:
1702c609719bSwdenk
1703c609719bSwdenk	Use this if you have an EEPROM or similar serial access
1704c609719bSwdenk	device and a driver for it.
1705c609719bSwdenk
1706c609719bSwdenk	- CFG_ENV_OFFSET:
1707c609719bSwdenk	- CFG_ENV_SIZE:
1708c609719bSwdenk
1709c609719bSwdenk	  These two #defines specify the offset and size of the
1710c609719bSwdenk	  environment area within the total memory of your EEPROM.
1711c609719bSwdenk
1712c609719bSwdenk	- CFG_I2C_EEPROM_ADDR:
1713c609719bSwdenk	  If defined, specified the chip address of the EEPROM device.
1714c609719bSwdenk	  The default address is zero.
1715c609719bSwdenk
1716c609719bSwdenk	- CFG_EEPROM_PAGE_WRITE_BITS:
1717c609719bSwdenk	  If defined, the number of bits used to address bytes in a
1718c609719bSwdenk	  single page in the EEPROM device.  A 64 byte page, for example
1719c609719bSwdenk	  would require six bits.
1720c609719bSwdenk
1721c609719bSwdenk	- CFG_EEPROM_PAGE_WRITE_DELAY_MS:
1722c609719bSwdenk	  If defined, the number of milliseconds to delay between
1723c609719bSwdenk	  page writes.  The default is zero milliseconds.
1724c609719bSwdenk
1725c609719bSwdenk	- CFG_I2C_EEPROM_ADDR_LEN:
1726c609719bSwdenk	  The length in bytes of the EEPROM memory array address.  Note
1727c609719bSwdenk	  that this is NOT the chip address length!
1728c609719bSwdenk
1729c609719bSwdenk	- CFG_EEPROM_SIZE:
1730c609719bSwdenk	  The size in bytes of the EEPROM device.
1731c609719bSwdenk
1732c609719bSwdenk
1733c609719bSwdenk- CFG_SPI_INIT_OFFSET
1734c609719bSwdenk
1735c609719bSwdenk	Defines offset to the initial SPI buffer area in DPRAM. The
1736c609719bSwdenk	area is used at an early stage (ROM part) if the environment
1737c609719bSwdenk	is configured to reside in the SPI EEPROM: We need a 520 byte
1738c609719bSwdenk	scratch DPRAM area. It is used between the two initialization
1739c609719bSwdenk	calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems
1740c609719bSwdenk	to be a good choice since it makes it far enough from the
1741c609719bSwdenk	start of the data area as well as from the stack pointer.
1742c609719bSwdenk
1743c609719bSwdenkPlease note that the environment is read-only as long as the monitor
1744c609719bSwdenkhas been relocated to RAM and a RAM copy of the environment has been
1745c609719bSwdenkcreated; also, when using EEPROM you will have to use getenv_r()
1746c609719bSwdenkuntil then to read environment variables.
1747c609719bSwdenk
174885ec0bccSwdenkThe environment is protected by a CRC32 checksum. Before the monitor
174985ec0bccSwdenkis relocated into RAM, as a result of a bad CRC you will be working
175085ec0bccSwdenkwith the compiled-in default environment - *silently*!!! [This is
175185ec0bccSwdenknecessary, because the first environment variable we need is the
175285ec0bccSwdenk"baudrate" setting for the console - if we have a bad CRC, we don't
175385ec0bccSwdenkhave any device yet where we could complain.]
1754c609719bSwdenk
1755c609719bSwdenkNote: once the monitor has been relocated, then it will complain if
1756c609719bSwdenkthe default environment is used; a new CRC is computed as soon as you
175785ec0bccSwdenkuse the "saveenv" command to store a valid environment.
1758c609719bSwdenk
1759fc3e2165Swdenk- CFG_FAULT_ECHO_LINK_DOWN:
1760fc3e2165Swdenk	        Echo the inverted Ethernet link state to the fault LED.
1761fc3e2165Swdenk
1762fc3e2165Swdenk		Note: If this option is active, then CFG_FAULT_MII_ADDR
1763fc3e2165Swdenk		      also needs to be defined.
1764fc3e2165Swdenk
1765fc3e2165Swdenk- CFG_FAULT_MII_ADDR:
1766fc3e2165Swdenk	        MII address of the PHY to check for the Ethernet link state.
1767c609719bSwdenk
1768c609719bSwdenkLow Level (hardware related) configuration options:
1769dc7c9a1aSwdenk---------------------------------------------------
1770c609719bSwdenk
1771c609719bSwdenk- CFG_CACHELINE_SIZE:
1772c609719bSwdenk		Cache Line Size of the CPU.
1773c609719bSwdenk
1774c609719bSwdenk- CFG_DEFAULT_IMMR:
1775c609719bSwdenk		Default address of the IMMR after system reset.
17762535d602Swdenk
17772535d602Swdenk                Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU,
17782535d602Swdenk                and RPXsuper) to be able to adjust the position of
17792535d602Swdenk                the IMMR register after a reset.
1780c609719bSwdenk
17817f6c2cbcSwdenk- Floppy Disk Support:
17827f6c2cbcSwdenk		CFG_FDC_DRIVE_NUMBER
17837f6c2cbcSwdenk
17847f6c2cbcSwdenk		the default drive number (default value 0)
17857f6c2cbcSwdenk
17867f6c2cbcSwdenk		CFG_ISA_IO_STRIDE
17877f6c2cbcSwdenk
17887f6c2cbcSwdenk		defines the spacing between fdc chipset registers
17897f6c2cbcSwdenk		(default value 1)
17907f6c2cbcSwdenk
17917f6c2cbcSwdenk		CFG_ISA_IO_OFFSET
17927f6c2cbcSwdenk
17937f6c2cbcSwdenk		defines the offset of register from address. It
17947f6c2cbcSwdenk		depends on which part of the data bus is connected to
17957f6c2cbcSwdenk		the fdc chipset. (default value 0)
17967f6c2cbcSwdenk
17977f6c2cbcSwdenk		If CFG_ISA_IO_STRIDE CFG_ISA_IO_OFFSET and
17987f6c2cbcSwdenk		CFG_FDC_DRIVE_NUMBER are undefined, they take their
17997f6c2cbcSwdenk		default value.
18007f6c2cbcSwdenk
18017f6c2cbcSwdenk		if CFG_FDC_HW_INIT is defined, then the function
18027f6c2cbcSwdenk		fdc_hw_init() is called at the beginning of the FDC
18037f6c2cbcSwdenk		setup. fdc_hw_init() must be provided by the board
18047f6c2cbcSwdenk		source code. It is used to make hardware dependant
18057f6c2cbcSwdenk		initializations.
18067f6c2cbcSwdenk
1807c609719bSwdenk- CFG_IMMR:	Physical address of the Internal Memory Mapped
1808c609719bSwdenk		Register; DO NOT CHANGE! (11-4)
1809c609719bSwdenk		[MPC8xx systems only]
1810c609719bSwdenk
1811c609719bSwdenk- CFG_INIT_RAM_ADDR:
1812c609719bSwdenk
18137152b1d0Swdenk		Start address of memory area that can be used for
1814c609719bSwdenk		initial data and stack; please note that this must be
1815c609719bSwdenk		writable memory that is working WITHOUT special
1816c609719bSwdenk		initialization, i. e. you CANNOT use normal RAM which
1817c609719bSwdenk		will become available only after programming the
1818c609719bSwdenk		memory controller and running certain initialization
1819c609719bSwdenk		sequences.
1820c609719bSwdenk
1821c609719bSwdenk		U-Boot uses the following memory types:
1822c609719bSwdenk		- MPC8xx and MPC8260: IMMR (internal memory of the CPU)
1823c609719bSwdenk		- MPC824X: data cache
1824c609719bSwdenk		- PPC4xx:  data cache
1825c609719bSwdenk
182685ec0bccSwdenk- CFG_GBL_DATA_OFFSET:
1827c609719bSwdenk
1828c609719bSwdenk		Offset of the initial data structure in the memory
1829c609719bSwdenk		area defined by CFG_INIT_RAM_ADDR. Usually
183085ec0bccSwdenk		CFG_GBL_DATA_OFFSET is chosen such that the initial
1831c609719bSwdenk		data is located at the end of the available space
1832c609719bSwdenk		(sometimes written as (CFG_INIT_RAM_END -
1833c609719bSwdenk		CFG_INIT_DATA_SIZE), and the initial stack is just
1834c609719bSwdenk		below that area (growing from (CFG_INIT_RAM_ADDR +
183585ec0bccSwdenk		CFG_GBL_DATA_OFFSET) downward.
1836c609719bSwdenk
1837c609719bSwdenk	Note:
1838c609719bSwdenk		On the MPC824X (or other systems that use the data
1839c609719bSwdenk		cache for initial memory) the address chosen for
1840c609719bSwdenk		CFG_INIT_RAM_ADDR is basically arbitrary - it must
1841c609719bSwdenk		point to an otherwise UNUSED address space between
1842c609719bSwdenk		the top of RAM and the start of the PCI space.
1843c609719bSwdenk
1844c609719bSwdenk- CFG_SIUMCR:	SIU Module Configuration (11-6)
1845c609719bSwdenk
1846c609719bSwdenk- CFG_SYPCR:	System Protection Control (11-9)
1847c609719bSwdenk
1848c609719bSwdenk- CFG_TBSCR:	Time Base Status and Control (11-26)
1849c609719bSwdenk
1850c609719bSwdenk- CFG_PISCR:	Periodic Interrupt Status and Control (11-31)
1851c609719bSwdenk
1852c609719bSwdenk- CFG_PLPRCR:	PLL, Low-Power, and Reset Control Register (15-30)
1853c609719bSwdenk
1854c609719bSwdenk- CFG_SCCR:	System Clock and reset Control Register (15-27)
1855c609719bSwdenk
1856c609719bSwdenk- CFG_OR_TIMING_SDRAM:
1857c609719bSwdenk		SDRAM timing
1858c609719bSwdenk
1859c609719bSwdenk- CFG_MAMR_PTA:
1860c609719bSwdenk		periodic timer for refresh
1861c609719bSwdenk
1862c609719bSwdenk- CFG_DER:	Debug Event Register (37-47)
1863c609719bSwdenk
1864c609719bSwdenk- FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CFG_REMAP_OR_AM,
1865c609719bSwdenk  CFG_PRELIM_OR_AM, CFG_OR_TIMING_FLASH, CFG_OR0_REMAP,
1866c609719bSwdenk  CFG_OR0_PRELIM, CFG_BR0_PRELIM, CFG_OR1_REMAP, CFG_OR1_PRELIM,
1867c609719bSwdenk  CFG_BR1_PRELIM:
1868c609719bSwdenk		Memory Controller Definitions: BR0/1 and OR0/1 (FLASH)
1869c609719bSwdenk
1870c609719bSwdenk- SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE,
1871c609719bSwdenk  CFG_OR_TIMING_SDRAM, CFG_OR2_PRELIM, CFG_BR2_PRELIM,
1872c609719bSwdenk  CFG_OR3_PRELIM, CFG_BR3_PRELIM:
1873c609719bSwdenk		Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM)
1874c609719bSwdenk
1875c609719bSwdenk- CFG_MAMR_PTA, CFG_MPTPR_2BK_4K, CFG_MPTPR_1BK_4K, CFG_MPTPR_2BK_8K,
1876c609719bSwdenk  CFG_MPTPR_1BK_8K, CFG_MAMR_8COL, CFG_MAMR_9COL:
1877c609719bSwdenk		Machine Mode Register and Memory Periodic Timer
1878c609719bSwdenk		Prescaler definitions (SDRAM timing)
1879c609719bSwdenk
1880c609719bSwdenk- CFG_I2C_UCODE_PATCH, CFG_I2C_DPMEM_OFFSET [0x1FC0]:
1881c609719bSwdenk		enable I2C microcode relocation patch (MPC8xx);
1882c609719bSwdenk		define relocation offset in DPRAM [DSP2]
1883c609719bSwdenk
1884c609719bSwdenk- CFG_SPI_UCODE_PATCH, CFG_SPI_DPMEM_OFFSET [0x1FC0]:
1885c609719bSwdenk		enable SPI microcode relocation patch (MPC8xx);
1886c609719bSwdenk		define relocation offset in DPRAM [SCC4]
1887c609719bSwdenk
1888c609719bSwdenk- CFG_USE_OSCCLK:
1889c609719bSwdenk		Use OSCM clock mode on MBX8xx board. Be careful,
1890c609719bSwdenk		wrong setting might damage your board. Read
1891c609719bSwdenk		doc/README.MBX before setting this variable!
1892c609719bSwdenk
1893ea909b76Swdenk- CFG_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only)
1894ea909b76Swdenk		Offset of the bootmode word in DPRAM used by post
1895ea909b76Swdenk		(Power On Self Tests). This definition overrides
1896ea909b76Swdenk		#define'd default value in commproc.h resp.
1897ea909b76Swdenk		cpm_8260.h.
1898ea909b76Swdenk
18995d232d0eSwdenk- CFG_PCI_SLV_MEM_LOCAL, CFG_PCI_SLV_MEM_BUS, CFG_PICMR0_MASK_ATTRIB,
19005d232d0eSwdenk  CFG_PCI_MSTR0_LOCAL, CFG_PCIMSK0_MASK, CFG_PCI_MSTR1_LOCAL,
19015d232d0eSwdenk  CFG_PCIMSK1_MASK, CFG_PCI_MSTR_MEM_LOCAL, CFG_PCI_MSTR_MEM_BUS,
19025d232d0eSwdenk  CFG_CPU_PCI_MEM_START, CFG_PCI_MSTR_MEM_SIZE, CFG_POCMR0_MASK_ATTRIB,
19035d232d0eSwdenk  CFG_PCI_MSTR_MEMIO_LOCAL, CFG_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START,
19045d232d0eSwdenk  CFG_PCI_MSTR_MEMIO_SIZE, CFG_POCMR1_MASK_ATTRIB, CFG_PCI_MSTR_IO_LOCAL,
19055d232d0eSwdenk  CFG_PCI_MSTR_IO_BUS, CFG_CPU_PCI_IO_START, CFG_PCI_MSTR_IO_SIZE,
19065d232d0eSwdenk  CFG_POCMR2_MASK_ATTRIB: (MPC826x only)
19075d232d0eSwdenk		Overrides the default PCI memory map in cpu/mpc8260/pci.c if set.
19085d232d0eSwdenk
1909c609719bSwdenkBuilding the Software:
1910c609719bSwdenk======================
1911c609719bSwdenk
1912c609719bSwdenkBuilding U-Boot has been tested in native PPC environments (on a
1913c609719bSwdenkPowerBook G3 running LinuxPPC 2000) and in cross environments
1914c609719bSwdenk(running RedHat 6.x and 7.x Linux on x86, Solaris 2.6 on a SPARC, and
1915c609719bSwdenkNetBSD 1.5 on x86).
1916c609719bSwdenk
1917c609719bSwdenkIf you are not using a native PPC environment, it is assumed that you
1918c609719bSwdenkhave the GNU cross compiling tools available in your path and named
1919c609719bSwdenkwith a prefix of "powerpc-linux-". If this is not the case, (e.g. if
1920c609719bSwdenkyou are using Monta Vista's Hard Hat Linux CDK 1.2) you must change
1921c609719bSwdenkthe definition of CROSS_COMPILE in Makefile. For HHL on a 4xx CPU,
1922c609719bSwdenkchange it to:
1923c609719bSwdenk
1924c609719bSwdenk	CROSS_COMPILE = ppc_4xx-
1925c609719bSwdenk
1926c609719bSwdenk
1927c609719bSwdenkU-Boot is intended to be  simple  to  build.  After  installing  the
1928c609719bSwdenksources	 you must configure U-Boot for one specific board type. This
1929c609719bSwdenkis done by typing:
1930c609719bSwdenk
1931c609719bSwdenk	make NAME_config
1932c609719bSwdenk
1933c609719bSwdenkwhere "NAME_config" is the name of one of the existing
1934c609719bSwdenkconfigurations; the following names are supported:
1935c609719bSwdenk
1936c609719bSwdenk    ADCIOP_config	  GTH_config		TQM850L_config
1937c609719bSwdenk    ADS860_config	  IP860_config		TQM855L_config
1938c609719bSwdenk    AR405_config	  IVML24_config		TQM860L_config
1939c609719bSwdenk    CANBT_config	  IVMS8_config		WALNUT405_config
1940c609719bSwdenk    CPCI405_config	  LANTEC_config		cogent_common_config
1941c609719bSwdenk    CPCIISER4_config	  MBX_config		cogent_mpc8260_config
1942c609719bSwdenk    CU824_config	  MBX860T_config	cogent_mpc8xx_config
1943c609719bSwdenk    ESTEEM192E_config	  RPXlite_config	hermes_config
1944c609719bSwdenk    ETX094_config	  RPXsuper_config	hymod_config
1945c609719bSwdenk    FADS823_config	  SM850_config		lwmon_config
1946c609719bSwdenk    FADS850SAR_config	  SPD823TS_config	pcu_e_config
1947c609719bSwdenk    FADS860T_config	  SXNI855T_config	rsdproto_config
1948c609719bSwdenk    FPS850L_config	  Sandpoint8240_config	sbc8260_config
1949c609719bSwdenk    GENIETV_config	  TQM823L_config	PIP405_config
1950384ae025Swdenk    GEN860T_config	  EBONY_config		FPS860L_config
19517f70e853Swdenk    ELPT860_config	  cmi_mpc5xx_config	NETVIA_config
19522535d602Swdenk    at91rm9200dk_config	  omap1510inn_config	MPC8260ADS_config
195354387ac9Swdenk    omap1610inn_config	  ZPC1900_config
195454387ac9Swdenk
1955c609719bSwdenkNote: for some board special configuration names may exist; check  if
1956c609719bSwdenk      additional  information is available from the board vendor; for
1957c609719bSwdenk      instance, the TQM8xxL systems run normally at 50 MHz and use  a
1958c609719bSwdenk      SCC  for	10baseT	 ethernet; there are also systems with 80 MHz
1959c609719bSwdenk      CPU clock, and an optional Fast Ethernet	module	is  available
1960c609719bSwdenk      for  CPU's  with FEC. You can select such additional "features"
1961c609719bSwdenk      when chosing the configuration, i. e.
1962c609719bSwdenk
1963c609719bSwdenk      make TQM860L_config
1964c609719bSwdenk	- will configure for a plain TQM860L, i. e. 50MHz, no FEC
1965c609719bSwdenk
1966c609719bSwdenk      make TQM860L_FEC_config
1967c609719bSwdenk	- will configure for a TQM860L at 50MHz with FEC for ethernet
1968c609719bSwdenk
1969c609719bSwdenk      make TQM860L_80MHz_config
1970c609719bSwdenk	- will configure for a TQM860L at 80 MHz, with normal 10baseT
1971c609719bSwdenk	  interface
1972c609719bSwdenk
1973c609719bSwdenk      make TQM860L_FEC_80MHz_config
1974c609719bSwdenk	- will configure for a TQM860L at 80 MHz with FEC for ethernet
1975c609719bSwdenk
1976c609719bSwdenk      make TQM823L_LCD_config
1977c609719bSwdenk	- will configure for a TQM823L with U-Boot console on LCD
1978c609719bSwdenk
1979c609719bSwdenk      make TQM823L_LCD_80MHz_config
1980c609719bSwdenk	- will configure for a TQM823L at 80 MHz with U-Boot console on LCD
1981c609719bSwdenk
1982c609719bSwdenk      etc.
1983c609719bSwdenk
1984c609719bSwdenk
1985c609719bSwdenkFinally, type "make all", and you should get some working U-Boot
19867152b1d0Swdenkimages ready for download to / installation on your system:
1987c609719bSwdenk
1988c609719bSwdenk- "u-boot.bin" is a raw binary image
1989c609719bSwdenk- "u-boot" is an image in ELF binary format
1990c609719bSwdenk- "u-boot.srec" is in Motorola S-Record format
1991c609719bSwdenk
1992c609719bSwdenk
1993c609719bSwdenkPlease be aware that the Makefiles assume you are using GNU make, so
1994c609719bSwdenkfor instance on NetBSD you might need to use "gmake" instead of
1995c609719bSwdenknative "make".
1996c609719bSwdenk
1997c609719bSwdenk
1998c609719bSwdenkIf the system board that you have is not listed, then you will need
1999c609719bSwdenkto port U-Boot to your hardware platform. To do this, follow these
2000c609719bSwdenksteps:
2001c609719bSwdenk
2002c609719bSwdenk1.  Add a new configuration option for your board to the toplevel
200385ec0bccSwdenk    "Makefile" and to the "MAKEALL" script, using the existing
200485ec0bccSwdenk    entries as examples. Note that here and at many other places
20057152b1d0Swdenk    boards and other names are listed in alphabetical sort order. Please
200685ec0bccSwdenk    keep this order.
2007c609719bSwdenk2.  Create a new directory to hold your board specific code. Add any
200885ec0bccSwdenk    files you need. In your board directory, you will need at least
200985ec0bccSwdenk    the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds".
201085ec0bccSwdenk3.  Create a new configuration file "include/configs/<board>.h" for
201185ec0bccSwdenk    your board
2012c609719bSwdenk3.  If you're porting U-Boot to a new CPU, then also create a new
2013c609719bSwdenk    directory to hold your CPU specific code. Add any files you need.
201485ec0bccSwdenk4.  Run "make <board>_config" with your new name.
2015c609719bSwdenk5.  Type "make", and you should get a working "u-boot.srec" file
2016c609719bSwdenk    to be installed on your target system.
201785ec0bccSwdenk6.  Debug and solve any problems that might arise.
2018c609719bSwdenk    [Of course, this last step is much harder than it sounds.]
2019c609719bSwdenk
2020c609719bSwdenk
2021c609719bSwdenkTesting of U-Boot Modifications, Ports to New Hardware, etc.:
2022c609719bSwdenk==============================================================
2023c609719bSwdenk
2024c609719bSwdenkIf you have modified U-Boot sources (for instance added a new	board
2025c609719bSwdenkor  support  for  new  devices,	 a new CPU, etc.) you are expected to
2026c609719bSwdenkprovide feedback to the other developers. The feedback normally takes
2027c609719bSwdenkthe form of a "patch", i. e. a context diff against a certain (latest
2028c609719bSwdenkofficial or latest in CVS) version of U-Boot sources.
2029c609719bSwdenk
2030c609719bSwdenkBut before you submit such a patch, please verify that	your  modifi-
2031c609719bSwdenkcation	did not break existing code. At least make sure that *ALL* of
2032c609719bSwdenkthe supported boards compile WITHOUT ANY compiler warnings. To do so,
2033c609719bSwdenkjust run the "MAKEALL" script, which will configure and build U-Boot
2034c609719bSwdenkfor ALL supported system. Be warned, this will take a while. You  can
20357152b1d0Swdenkselect	which  (cross)	compiler  to use by passing a `CROSS_COMPILE'
2036c609719bSwdenkenvironment variable to the script, i. e. to use the cross tools from
2037c609719bSwdenkMontaVista's Hard Hat Linux you can type
2038c609719bSwdenk
2039c609719bSwdenk	CROSS_COMPILE=ppc_8xx- MAKEALL
2040c609719bSwdenk
2041c609719bSwdenkor to build on a native PowerPC system you can type
2042c609719bSwdenk
2043c609719bSwdenk	CROSS_COMPILE=' ' MAKEALL
2044c609719bSwdenk
2045c609719bSwdenkSee also "U-Boot Porting Guide" below.
2046c609719bSwdenk
2047c609719bSwdenk
2048c609719bSwdenkMonitor Commands - Overview:
2049c609719bSwdenk============================
2050c609719bSwdenk
2051c609719bSwdenkgo	- start application at address 'addr'
2052c609719bSwdenkrun	- run commands in an environment variable
2053c609719bSwdenkbootm	- boot application image from memory
2054c609719bSwdenkbootp	- boot image via network using BootP/TFTP protocol
2055c609719bSwdenktftpboot- boot image via network using TFTP protocol
2056c609719bSwdenk	       and env variables "ipaddr" and "serverip"
2057c609719bSwdenk	       (and eventually "gatewayip")
2058c609719bSwdenkrarpboot- boot image via network using RARP/TFTP protocol
2059c609719bSwdenkdiskboot- boot from IDE devicebootd   - boot default, i.e., run 'bootcmd'
2060c609719bSwdenkloads	- load S-Record file over serial line
2061c609719bSwdenkloadb	- load binary file over serial line (kermit mode)
2062c609719bSwdenkmd	- memory display
2063c609719bSwdenkmm	- memory modify (auto-incrementing)
2064c609719bSwdenknm	- memory modify (constant address)
2065c609719bSwdenkmw	- memory write (fill)
2066c609719bSwdenkcp	- memory copy
2067c609719bSwdenkcmp	- memory compare
2068c609719bSwdenkcrc32	- checksum calculation
2069c609719bSwdenkimd     - i2c memory display
2070c609719bSwdenkimm     - i2c memory modify (auto-incrementing)
2071c609719bSwdenkinm     - i2c memory modify (constant address)
2072c609719bSwdenkimw     - i2c memory write (fill)
2073c609719bSwdenkicrc32  - i2c checksum calculation
2074c609719bSwdenkiprobe  - probe to discover valid I2C chip addresses
2075c609719bSwdenkiloop   - infinite loop on address range
2076c609719bSwdenkisdram  - print SDRAM configuration information
2077c609719bSwdenksspi    - SPI utility commands
2078c609719bSwdenkbase	- print or set address offset
2079c609719bSwdenkprintenv- print environment variables
2080c609719bSwdenksetenv	- set environment variables
2081c609719bSwdenksaveenv - save environment variables to persistent storage
2082c609719bSwdenkprotect - enable or disable FLASH write protection
2083c609719bSwdenkerase	- erase FLASH memory
2084c609719bSwdenkflinfo	- print FLASH memory information
2085c609719bSwdenkbdinfo	- print Board Info structure
2086c609719bSwdenkiminfo	- print header information for application image
2087c609719bSwdenkconinfo - print console devices and informations
2088c609719bSwdenkide	- IDE sub-system
2089c609719bSwdenkloop	- infinite loop on address range
2090c609719bSwdenkmtest	- simple RAM test
2091c609719bSwdenkicache	- enable or disable instruction cache
2092c609719bSwdenkdcache	- enable or disable data cache
2093c609719bSwdenkreset	- Perform RESET of the CPU
2094c609719bSwdenkecho	- echo args to console
2095c609719bSwdenkversion - print monitor version
2096c609719bSwdenkhelp	- print online help
2097c609719bSwdenk?	- alias for 'help'
2098c609719bSwdenk
2099c609719bSwdenk
2100c609719bSwdenkMonitor Commands - Detailed Description:
2101c609719bSwdenk========================================
2102c609719bSwdenk
2103c609719bSwdenkTODO.
2104c609719bSwdenk
2105c609719bSwdenkFor now: just type "help <command>".
2106c609719bSwdenk
2107c609719bSwdenk
2108c609719bSwdenkEnvironment Variables:
2109c609719bSwdenk======================
2110c609719bSwdenk
2111c609719bSwdenkU-Boot supports user configuration using Environment Variables which
2112c609719bSwdenkcan be made persistent by saving to Flash memory.
2113c609719bSwdenk
2114c609719bSwdenkEnvironment Variables are set using "setenv", printed using
2115c609719bSwdenk"printenv", and saved to Flash using "saveenv". Using "setenv"
2116c609719bSwdenkwithout a value can be used to delete a variable from the
2117c609719bSwdenkenvironment. As long as you don't save the environment you are
2118c609719bSwdenkworking with an in-memory copy. In case the Flash area containing the
2119c609719bSwdenkenvironment is erased by accident, a default environment is provided.
2120c609719bSwdenk
2121c609719bSwdenkSome configuration options can be set using Environment Variables:
2122c609719bSwdenk
2123c609719bSwdenk  baudrate	- see CONFIG_BAUDRATE
2124c609719bSwdenk
2125c609719bSwdenk  bootdelay	- see CONFIG_BOOTDELAY
2126c609719bSwdenk
2127c609719bSwdenk  bootcmd	- see CONFIG_BOOTCOMMAND
2128c609719bSwdenk
2129c609719bSwdenk  bootargs	- Boot arguments when booting an RTOS image
2130c609719bSwdenk
2131c609719bSwdenk  bootfile	- Name of the image to load with TFTP
2132c609719bSwdenk
2133c609719bSwdenk  autoload	- if set to "no" (any string beginning with 'n'),
2134c609719bSwdenk		  "bootp" will just load perform a lookup of the
2135c609719bSwdenk		  configuration from the BOOTP server, but not try to
2136c609719bSwdenk		  load any image using TFTP
2137c609719bSwdenk
2138c609719bSwdenk  autostart	- if set to "yes", an image loaded using the "bootp",
2139c609719bSwdenk		  "rarpboot", "tftpboot" or "diskboot" commands will
2140c609719bSwdenk		  be automatically started (by internally calling
2141c609719bSwdenk		  "bootm")
2142c609719bSwdenk
21434a6fd34bSwdenk		  If set to "no", a standalone image passed to the
21444a6fd34bSwdenk		  "bootm" command will be copied to the load address
21454a6fd34bSwdenk		  (and eventually uncompressed), but NOT be started.
21464a6fd34bSwdenk		  This can be used to load and uncompress arbitrary
21474a6fd34bSwdenk		  data.
21484a6fd34bSwdenk
2149c609719bSwdenk  initrd_high	- restrict positioning of initrd images:
2150c609719bSwdenk		  If this variable is not set, initrd images will be
2151c609719bSwdenk		  copied to the highest possible address in RAM; this
2152c609719bSwdenk		  is usually what you want since it allows for
2153c609719bSwdenk		  maximum initrd size. If for some reason you want to
2154c609719bSwdenk		  make sure that the initrd image is loaded below the
2155c609719bSwdenk		  CFG_BOOTMAPSZ limit, you can set this environment
2156c609719bSwdenk		  variable to a value of "no" or "off" or "0".
2157c609719bSwdenk		  Alternatively, you can set it to a maximum upper
2158c609719bSwdenk		  address to use (U-Boot will still check that it
2159c609719bSwdenk		  does not overwrite the U-Boot stack and data).
2160c609719bSwdenk
2161c609719bSwdenk		  For instance, when you have a system with 16 MB
21627152b1d0Swdenk		  RAM, and want to reserve 4 MB from use by Linux,
2163c609719bSwdenk		  you can do this by adding "mem=12M" to the value of
2164c609719bSwdenk		  the "bootargs" variable. However, now you must make
21657152b1d0Swdenk		  sure that the initrd image is placed in the first
2166c609719bSwdenk		  12 MB as well - this can be done with
2167c609719bSwdenk
2168c609719bSwdenk		  setenv initrd_high 00c00000
2169c609719bSwdenk
217038b99261Swdenk		  If you set initrd_high to 0xFFFFFFFF, this is an
217138b99261Swdenk		  indication to U-Boot that all addresses are legal
217238b99261Swdenk		  for the Linux kernel, including addresses in flash
217338b99261Swdenk		  memory. In this case U-Boot will NOT COPY the
217438b99261Swdenk		  ramdisk at all. This may be useful to reduce the
217538b99261Swdenk		  boot time on your system, but requires that this
217638b99261Swdenk		  feature is supported by your Linux kernel.
217738b99261Swdenk
2178c609719bSwdenk  ipaddr	- IP address; needed for tftpboot command
2179c609719bSwdenk
2180c609719bSwdenk  loadaddr	- Default load address for commands like "bootp",
2181dc7c9a1aSwdenk		  "rarpboot", "tftpboot", "loadb" or "diskboot"
2182c609719bSwdenk
2183c609719bSwdenk  loads_echo	- see CONFIG_LOADS_ECHO
2184c609719bSwdenk
2185c609719bSwdenk  serverip	- TFTP server IP address; needed for tftpboot command
2186c609719bSwdenk
2187c609719bSwdenk  bootretry	- see CONFIG_BOOT_RETRY_TIME
2188c609719bSwdenk
2189c609719bSwdenk  bootdelaykey	- see CONFIG_AUTOBOOT_DELAY_STR
2190c609719bSwdenk
2191c609719bSwdenk  bootstopkey	- see CONFIG_AUTOBOOT_STOP_STR
2192c609719bSwdenk
2193c609719bSwdenk
2194c609719bSwdenkThe following environment variables may be used and automatically
2195c609719bSwdenkupdated by the network boot commands ("bootp" and "rarpboot"),
2196c609719bSwdenkdepending the information provided by your boot server:
2197c609719bSwdenk
2198c609719bSwdenk  bootfile	- see above
2199c609719bSwdenk  dnsip		- IP address of your Domain Name Server
2200fe389a82Sstroese  dnsip2	- IP address of your secondary Domain Name Server
2201c609719bSwdenk  gatewayip	- IP address of the Gateway (Router) to use
2202c609719bSwdenk  hostname	- Target hostname
2203c609719bSwdenk  ipaddr	- see above
2204c609719bSwdenk  netmask	- Subnet Mask
2205c609719bSwdenk  rootpath	- Pathname of the root filesystem on the NFS server
2206c609719bSwdenk  serverip	- see above
2207c609719bSwdenk
2208c609719bSwdenk
2209c609719bSwdenkThere are two special Environment Variables:
2210c609719bSwdenk
2211c609719bSwdenk  serial#	- contains hardware identification information such
2212c609719bSwdenk		  as type string and/or serial number
2213c609719bSwdenk  ethaddr	- Ethernet address
2214c609719bSwdenk
2215c609719bSwdenkThese variables can be set only once (usually during manufacturing of
2216c609719bSwdenkthe board). U-Boot refuses to delete or overwrite these variables
2217c609719bSwdenkonce they have been set once.
2218c609719bSwdenk
2219c609719bSwdenk
2220c1551ea8SstroeseFurther special Environment Variables:
2221c1551ea8Sstroese
2222c1551ea8Sstroese  ver		- Contains the U-Boot version string as printed
2223c1551ea8Sstroese		  with the "version" command. This variable is
2224c1551ea8Sstroese		  readonly (see CONFIG_VERSION_VARIABLE).
2225c1551ea8Sstroese
2226c1551ea8Sstroese
2227c609719bSwdenkPlease note that changes to some configuration parameters may take
2228c609719bSwdenkonly effect after the next boot (yes, that's just like Windoze :-).
2229c609719bSwdenk
2230c609719bSwdenk
2231f07771ccSwdenkCommand Line Parsing:
2232f07771ccSwdenk=====================
2233f07771ccSwdenk
2234f07771ccSwdenkThere are two different command line parsers available with U-Boot:
22357152b1d0Swdenkthe old "simple" one, and the much more powerful "hush" shell:
2236f07771ccSwdenk
2237f07771ccSwdenkOld, simple command line parser:
2238f07771ccSwdenk--------------------------------
2239f07771ccSwdenk
2240f07771ccSwdenk- supports environment variables (through setenv / saveenv commands)
2241f07771ccSwdenk- several commands on one line, separated by ';'
2242f07771ccSwdenk- variable substitution using "... $(name) ..." syntax
2243f07771ccSwdenk- special characters ('$', ';') can be escaped by prefixing with '\',
2244f07771ccSwdenk  for example:
2245f07771ccSwdenk	setenv bootcmd bootm \$(address)
2246f07771ccSwdenk- You can also escape text by enclosing in single apostrophes, for example:
2247f07771ccSwdenk	setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off'
2248f07771ccSwdenk
2249f07771ccSwdenkHush shell:
2250f07771ccSwdenk-----------
2251f07771ccSwdenk
2252f07771ccSwdenk- similar to Bourne shell, with control structures like
2253f07771ccSwdenk  if...then...else...fi, for...do...done; while...do...done,
2254f07771ccSwdenk  until...do...done, ...
2255f07771ccSwdenk- supports environment ("global") variables (through setenv / saveenv
2256f07771ccSwdenk  commands) and local shell variables (through standard shell syntax
2257f07771ccSwdenk  "name=value"); only environment variables can be used with "run"
2258f07771ccSwdenk  command
2259f07771ccSwdenk
2260f07771ccSwdenkGeneral rules:
2261f07771ccSwdenk--------------
2262f07771ccSwdenk
2263f07771ccSwdenk(1) If a command line (or an environment variable executed by a "run"
2264f07771ccSwdenk    command) contains several commands separated by semicolon, and
2265f07771ccSwdenk    one of these commands fails, then the remaining commands will be
2266f07771ccSwdenk    executed anyway.
2267f07771ccSwdenk
2268f07771ccSwdenk(2) If you execute several variables with one call to run (i. e.
2269f07771ccSwdenk    calling run with a list af variables as arguments), any failing
2270f07771ccSwdenk    command will cause "run" to terminate, i. e. the remaining
2271f07771ccSwdenk    variables are not executed.
2272f07771ccSwdenk
2273c609719bSwdenkNote for Redundant Ethernet Interfaces:
2274c609719bSwdenk=======================================
2275c609719bSwdenk
22767152b1d0SwdenkSome boards come with redundant ethernet interfaces; U-Boot supports
2277c609719bSwdenksuch configurations and is capable of automatic selection of a
22787152b1d0Swdenk"working" interface when needed. MAC assignment works as follows:
2279c609719bSwdenk
2280c609719bSwdenkNetwork interfaces are numbered eth0, eth1, eth2, ... Corresponding
2281c609719bSwdenkMAC addresses can be stored in the environment as "ethaddr" (=>eth0),
2282c609719bSwdenk"eth1addr" (=>eth1), "eth2addr", ...
2283c609719bSwdenk
2284c609719bSwdenkIf the network interface stores some valid MAC address (for instance
2285c609719bSwdenkin SROM), this is used as default address if there is NO correspon-
2286c609719bSwdenkding setting in the environment; if the corresponding environment
2287c609719bSwdenkvariable is set, this overrides the settings in the card; that means:
2288c609719bSwdenk
2289c609719bSwdenko If the SROM has a valid MAC address, and there is no address in the
2290c609719bSwdenk  environment, the SROM's address is used.
2291c609719bSwdenk
2292c609719bSwdenko If there is no valid address in the SROM, and a definition in the
2293c609719bSwdenk  environment exists, then the value from the environment variable is
2294c609719bSwdenk  used.
2295c609719bSwdenk
2296c609719bSwdenko If both the SROM and the environment contain a MAC address, and
2297c609719bSwdenk  both addresses are the same, this MAC address is used.
2298c609719bSwdenk
2299c609719bSwdenko If both the SROM and the environment contain a MAC address, and the
2300c609719bSwdenk  addresses differ, the value from the environment is used and a
2301c609719bSwdenk  warning is printed.
2302c609719bSwdenk
2303c609719bSwdenko If neither SROM nor the environment contain a MAC address, an error
2304c609719bSwdenk  is raised.
2305c609719bSwdenk
2306c609719bSwdenk
2307c609719bSwdenkImage Formats:
2308c609719bSwdenk==============
2309c609719bSwdenk
2310c609719bSwdenkThe "boot" commands of this monitor operate on "image" files which
2311c609719bSwdenkcan be basicly anything, preceeded by a special header; see the
2312c609719bSwdenkdefinitions in include/image.h for details; basicly, the header
2313c609719bSwdenkdefines the following image properties:
2314c609719bSwdenk
2315c609719bSwdenk* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD,
2316c609719bSwdenk  4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks,
23177f70e853Swdenk  LynxOS, pSOS, QNX, RTEMS, ARTOS;
23181f4bb37dSwdenk  Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, ARTOS, LynxOS).
2319c609719bSwdenk* Target CPU Architecture (Provisions for Alpha, ARM, Intel x86,
2320c609719bSwdenk  IA64, MIPS, MIPS, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit;
2321c609719bSwdenk  Currently supported: PowerPC).
2322c29fdfc1Swdenk* Compression Type (uncompressed, gzip, bzip2)
2323c609719bSwdenk* Load Address
2324c609719bSwdenk* Entry Point
2325c609719bSwdenk* Image Name
2326c609719bSwdenk* Image Timestamp
2327c609719bSwdenk
2328c609719bSwdenkThe header is marked by a special Magic Number, and both the header
2329c609719bSwdenkand the data portions of the image are secured against corruption by
2330c609719bSwdenkCRC32 checksums.
2331c609719bSwdenk
2332c609719bSwdenk
2333c609719bSwdenkLinux Support:
2334c609719bSwdenk==============
2335c609719bSwdenk
2336c609719bSwdenkAlthough U-Boot should support any OS or standalone application
23377152b1d0Swdenkeasily, the main focus has always been on Linux during the design of
2338c609719bSwdenkU-Boot.
2339c609719bSwdenk
2340c609719bSwdenkU-Boot includes many features that so far have been part of some
2341c609719bSwdenkspecial "boot loader" code within the Linux kernel. Also, any
2342c609719bSwdenk"initrd" images to be used are no longer part of one big Linux image;
2343c609719bSwdenkinstead, kernel and "initrd" are separate images. This implementation
23447152b1d0Swdenkserves several purposes:
2345c609719bSwdenk
2346c609719bSwdenk- the same features can be used for other OS or standalone
2347c609719bSwdenk  applications (for instance: using compressed images to reduce the
2348c609719bSwdenk  Flash memory footprint)
2349c609719bSwdenk
2350c609719bSwdenk- it becomes much easier to port new Linux kernel versions because
23517152b1d0Swdenk  lots of low-level, hardware dependent stuff are done by U-Boot
2352c609719bSwdenk
2353c609719bSwdenk- the same Linux kernel image can now be used with different "initrd"
2354c609719bSwdenk  images; of course this also means that different kernel images can
2355c609719bSwdenk  be run with the same "initrd". This makes testing easier (you don't
2356c609719bSwdenk  have to build a new "zImage.initrd" Linux image when you just
2357c609719bSwdenk  change a file in your "initrd"). Also, a field-upgrade of the
2358c609719bSwdenk  software is easier now.
2359c609719bSwdenk
2360c609719bSwdenk
2361c609719bSwdenkLinux HOWTO:
2362c609719bSwdenk============
2363c609719bSwdenk
2364c609719bSwdenkPorting Linux to U-Boot based systems:
2365c609719bSwdenk---------------------------------------
2366c609719bSwdenk
2367c609719bSwdenkU-Boot cannot save you from doing all the necessary modifications to
2368c609719bSwdenkconfigure the Linux device drivers for use with your target hardware
2369c609719bSwdenk(no, we don't intend to provide a full virtual machine interface to
2370c609719bSwdenkLinux :-).
2371c609719bSwdenk
2372c609719bSwdenkBut now you can ignore ALL boot loader code (in arch/ppc/mbxboot).
2373c609719bSwdenk
2374c609719bSwdenkJust make sure your machine specific header file (for instance
2375c609719bSwdenkinclude/asm-ppc/tqm8xx.h) includes the same definition of the Board
2376c609719bSwdenkInformation structure as we define in include/u-boot.h, and make
2377c609719bSwdenksure that your definition of IMAP_ADDR uses the same value as your
2378c609719bSwdenkU-Boot configuration in CFG_IMMR.
2379c609719bSwdenk
2380c609719bSwdenk
2381c609719bSwdenkConfiguring the Linux kernel:
2382c609719bSwdenk-----------------------------
2383c609719bSwdenk
2384c609719bSwdenkNo specific requirements for U-Boot. Make sure you have some root
2385c609719bSwdenkdevice (initial ramdisk, NFS) for your target system.
2386c609719bSwdenk
2387c609719bSwdenk
2388c609719bSwdenkBuilding a Linux Image:
2389c609719bSwdenk-----------------------
2390c609719bSwdenk
239124ee89b9SwdenkWith U-Boot, "normal" build targets like "zImage" or "bzImage" are
239224ee89b9Swdenknot used. If you use recent kernel source, a new build target
239324ee89b9Swdenk"uImage" will exist which automatically builds an image usable by
239424ee89b9SwdenkU-Boot. Most older kernels also have support for a "pImage" target,
239524ee89b9Swdenkwhich was introduced for our predecessor project PPCBoot and uses a
239624ee89b9Swdenk100% compatible format.
2397c609719bSwdenk
2398c609719bSwdenkExample:
2399c609719bSwdenk
2400c609719bSwdenk	make TQM850L_config
2401c609719bSwdenk	make oldconfig
2402c609719bSwdenk	make dep
240324ee89b9Swdenk	make uImage
2404c609719bSwdenk
240524ee89b9SwdenkThe "uImage" build target uses a special tool (in 'tools/mkimage') to
240624ee89b9Swdenkencapsulate a compressed Linux kernel image with header  information,
240724ee89b9SwdenkCRC32 checksum etc. for use with U-Boot. This is what we are doing:
2408c609719bSwdenk
240924ee89b9Swdenk* build a standard "vmlinux" kernel image (in ELF binary format):
241024ee89b9Swdenk
241124ee89b9Swdenk* convert the kernel into a raw binary image:
241224ee89b9Swdenk
241324ee89b9Swdenk	${CROSS_COMPILE}-objcopy -O binary \
241424ee89b9Swdenk				 -R .note -R .comment \
241524ee89b9Swdenk				 -S vmlinux linux.bin
241624ee89b9Swdenk
241724ee89b9Swdenk* compress the binary image:
241824ee89b9Swdenk
241924ee89b9Swdenk	gzip -9 linux.bin
242024ee89b9Swdenk
242124ee89b9Swdenk* package compressed binary image for U-Boot:
242224ee89b9Swdenk
242324ee89b9Swdenk	mkimage -A ppc -O linux -T kernel -C gzip \
242424ee89b9Swdenk		-a 0 -e 0 -n "Linux Kernel Image" \
242524ee89b9Swdenk		-d linux.bin.gz uImage
242624ee89b9Swdenk
242724ee89b9Swdenk
242824ee89b9SwdenkThe "mkimage" tool can also be used to create ramdisk images for use
242924ee89b9Swdenkwith U-Boot, either separated from the Linux kernel image, or
243024ee89b9Swdenkcombined into one file. "mkimage" encapsulates the images with a 64
243124ee89b9Swdenkbyte header containing information about target architecture,
243224ee89b9Swdenkoperating system, image type, compression method, entry points, time
243324ee89b9Swdenkstamp, CRC32 checksums, etc.
243424ee89b9Swdenk
243524ee89b9Swdenk"mkimage" can be called in two ways: to verify existing images and
243624ee89b9Swdenkprint the header information, or to build new images.
2437c609719bSwdenk
2438c609719bSwdenkIn the first form (with "-l" option) mkimage lists the information
2439c609719bSwdenkcontained in the header of an existing U-Boot image; this includes
2440c609719bSwdenkchecksum verification:
2441c609719bSwdenk
2442c609719bSwdenk	tools/mkimage -l image
2443c609719bSwdenk	  -l ==> list image header information
2444c609719bSwdenk
2445c609719bSwdenkThe second form (with "-d" option) is used to build a U-Boot image
2446c609719bSwdenkfrom a "data file" which is used as image payload:
2447c609719bSwdenk
2448c609719bSwdenk	tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \
2449c609719bSwdenk		      -n name -d data_file image
2450c609719bSwdenk	  -A ==> set architecture to 'arch'
2451c609719bSwdenk	  -O ==> set operating system to 'os'
2452c609719bSwdenk	  -T ==> set image type to 'type'
2453c609719bSwdenk	  -C ==> set compression type 'comp'
2454c609719bSwdenk	  -a ==> set load address to 'addr' (hex)
2455c609719bSwdenk	  -e ==> set entry point to 'ep' (hex)
2456c609719bSwdenk	  -n ==> set image name to 'name'
2457c609719bSwdenk	  -d ==> use image data from 'datafile'
2458c609719bSwdenk
2459c609719bSwdenkRight now, all Linux kernels use the same load address	(0x00000000),
2460c609719bSwdenkbut the entry point address depends on the kernel version:
2461c609719bSwdenk
2462c609719bSwdenk- 2.2.x kernels have the entry point at 0x0000000C,
246324ee89b9Swdenk- 2.3.x and later kernels have the entry point at 0x00000000.
2464c609719bSwdenk
2465c609719bSwdenkSo a typical call to build a U-Boot image would read:
2466c609719bSwdenk
246724ee89b9Swdenk	-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
246824ee89b9Swdenk	> -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \
246924ee89b9Swdenk	> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux.gz \
247024ee89b9Swdenk	> examples/uImage.TQM850L
247124ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
2472c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
2473c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (gzip compressed)
2474c609719bSwdenk	Data Size:    335725 Bytes = 327.86 kB = 0.32 MB
2475c609719bSwdenk	Load Address: 0x00000000
247624ee89b9Swdenk	Entry Point:  0x00000000
2477c609719bSwdenk
2478c609719bSwdenkTo verify the contents of the image (or check for corruption):
2479c609719bSwdenk
248024ee89b9Swdenk	-> tools/mkimage -l examples/uImage.TQM850L
248124ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
2482c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
2483c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (gzip compressed)
2484c609719bSwdenk	Data Size:    335725 Bytes = 327.86 kB = 0.32 MB
2485c609719bSwdenk	Load Address: 0x00000000
248624ee89b9Swdenk	Entry Point:  0x00000000
2487c609719bSwdenk
2488c609719bSwdenkNOTE: for embedded systems where boot time is critical you can trade
2489c609719bSwdenkspeed for memory and install an UNCOMPRESSED image instead: this
2490c609719bSwdenkneeds more space in Flash, but boots much faster since it does not
2491c609719bSwdenkneed to be uncompressed:
2492c609719bSwdenk
249324ee89b9Swdenk	-> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux.gz
249424ee89b9Swdenk	-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
249524ee89b9Swdenk	> -A ppc -O linux -T kernel -C none -a 0 -e 0 \
249624ee89b9Swdenk	> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux \
249724ee89b9Swdenk	> examples/uImage.TQM850L-uncompressed
249824ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
2499c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
2500c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (uncompressed)
2501c609719bSwdenk	Data Size:    792160 Bytes = 773.59 kB = 0.76 MB
2502c609719bSwdenk	Load Address: 0x00000000
250324ee89b9Swdenk	Entry Point:  0x00000000
2504c609719bSwdenk
2505c609719bSwdenk
2506c609719bSwdenkSimilar you can build U-Boot images from a 'ramdisk.image.gz' file
2507c609719bSwdenkwhen your kernel is intended to use an initial ramdisk:
2508c609719bSwdenk
2509c609719bSwdenk	-> tools/mkimage -n 'Simple Ramdisk Image' \
2510c609719bSwdenk	> -A ppc -O linux -T ramdisk -C gzip \
2511c609719bSwdenk	> -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd
2512c609719bSwdenk	Image Name:   Simple Ramdisk Image
2513c609719bSwdenk	Created:      Wed Jan 12 14:01:50 2000
2514c609719bSwdenk	Image Type:   PowerPC Linux RAMDisk Image (gzip compressed)
2515c609719bSwdenk	Data Size:    566530 Bytes = 553.25 kB = 0.54 MB
2516c609719bSwdenk	Load Address: 0x00000000
2517c609719bSwdenk	Entry Point:  0x00000000
2518c609719bSwdenk
2519c609719bSwdenk
2520c609719bSwdenkInstalling a Linux Image:
2521c609719bSwdenk-------------------------
2522c609719bSwdenk
2523c609719bSwdenkTo downloading a U-Boot image over the serial (console) interface,
2524c609719bSwdenkyou must convert the image to S-Record format:
2525c609719bSwdenk
2526c609719bSwdenk	objcopy -I binary -O srec examples/image examples/image.srec
2527c609719bSwdenk
2528c609719bSwdenkThe 'objcopy' does not understand the information in the U-Boot
2529c609719bSwdenkimage header, so the resulting S-Record file will be relative to
2530c609719bSwdenkaddress 0x00000000. To load it to a given address, you need to
2531c609719bSwdenkspecify the target address as 'offset' parameter with the 'loads'
2532c609719bSwdenkcommand.
2533c609719bSwdenk
2534c609719bSwdenkExample: install the image to address 0x40100000 (which on the
2535c609719bSwdenkTQM8xxL is in the first Flash bank):
2536c609719bSwdenk
2537c609719bSwdenk	=> erase 40100000 401FFFFF
2538c609719bSwdenk
2539c609719bSwdenk	.......... done
2540c609719bSwdenk	Erased 8 sectors
2541c609719bSwdenk
2542c609719bSwdenk	=> loads 40100000
2543c609719bSwdenk	## Ready for S-Record download ...
2544c609719bSwdenk	~>examples/image.srec
2545c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 12 13 ...
2546c609719bSwdenk	...
2547c609719bSwdenk	15989 15990 15991 15992
2548c609719bSwdenk	[file transfer complete]
2549c609719bSwdenk	[connected]
2550c609719bSwdenk	## Start Addr = 0x00000000
2551c609719bSwdenk
2552c609719bSwdenk
2553c609719bSwdenkYou can check the success of the download using the 'iminfo' command;
2554c609719bSwdenkthis includes a checksum verification so you  can  be  sure  no	 data
2555c609719bSwdenkcorruption happened:
2556c609719bSwdenk
2557c609719bSwdenk	=> imi 40100000
2558c609719bSwdenk
2559c609719bSwdenk	## Checking Image at 40100000 ...
2560c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
2561c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
2562c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
2563c609719bSwdenk	   Load Address: 00000000
2564c609719bSwdenk	   Entry Point:	 0000000c
2565c609719bSwdenk	   Verifying Checksum ... OK
2566c609719bSwdenk
2567c609719bSwdenk
2568c609719bSwdenkBoot Linux:
2569c609719bSwdenk-----------
2570c609719bSwdenk
2571c609719bSwdenkThe "bootm" command is used to boot an application that is stored in
2572c609719bSwdenkmemory (RAM or Flash). In case of a Linux kernel image, the contents
2573c609719bSwdenkof the "bootargs" environment variable is passed to the kernel as
2574c609719bSwdenkparameters. You can check and modify this variable using the
2575c609719bSwdenk"printenv" and "setenv" commands:
2576c609719bSwdenk
2577c609719bSwdenk
2578c609719bSwdenk	=> printenv bootargs
2579c609719bSwdenk	bootargs=root=/dev/ram
2580c609719bSwdenk
2581c609719bSwdenk	=> setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
2582c609719bSwdenk
2583c609719bSwdenk	=> printenv bootargs
2584c609719bSwdenk	bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
2585c609719bSwdenk
2586c609719bSwdenk	=> bootm 40020000
2587c609719bSwdenk	## Booting Linux kernel at 40020000 ...
2588c609719bSwdenk	   Image Name:	 2.2.13 for NFS on TQM850L
2589c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
2590c609719bSwdenk	   Data Size:	 381681 Bytes = 372 kB = 0 MB
2591c609719bSwdenk	   Load Address: 00000000
2592c609719bSwdenk	   Entry Point:	 0000000c
2593c609719bSwdenk	   Verifying Checksum ... OK
2594c609719bSwdenk	   Uncompressing Kernel Image ... OK
2595c609719bSwdenk	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
2596c609719bSwdenk	Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
2597c609719bSwdenk	time_init: decrementer frequency = 187500000/60
2598c609719bSwdenk	Calibrating delay loop... 49.77 BogoMIPS
2599c609719bSwdenk	Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000]
2600c609719bSwdenk	...
2601c609719bSwdenk
2602c609719bSwdenkIf you want to boot a Linux kernel with initial ram disk, you pass
26037152b1d0Swdenkthe memory addresses of both the kernel and the initrd image (PPBCOOT
2604c609719bSwdenkformat!) to the "bootm" command:
2605c609719bSwdenk
2606c609719bSwdenk	=> imi 40100000 40200000
2607c609719bSwdenk
2608c609719bSwdenk	## Checking Image at 40100000 ...
2609c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
2610c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
2611c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
2612c609719bSwdenk	   Load Address: 00000000
2613c609719bSwdenk	   Entry Point:	 0000000c
2614c609719bSwdenk	   Verifying Checksum ... OK
2615c609719bSwdenk
2616c609719bSwdenk	## Checking Image at 40200000 ...
2617c609719bSwdenk	   Image Name:	 Simple Ramdisk Image
2618c609719bSwdenk	   Image Type:	 PowerPC Linux RAMDisk Image (gzip compressed)
2619c609719bSwdenk	   Data Size:	 566530 Bytes = 553 kB = 0 MB
2620c609719bSwdenk	   Load Address: 00000000
2621c609719bSwdenk	   Entry Point:	 00000000
2622c609719bSwdenk	   Verifying Checksum ... OK
2623c609719bSwdenk
2624c609719bSwdenk	=> bootm 40100000 40200000
2625c609719bSwdenk	## Booting Linux kernel at 40100000 ...
2626c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
2627c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
2628c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
2629c609719bSwdenk	   Load Address: 00000000
2630c609719bSwdenk	   Entry Point:	 0000000c
2631c609719bSwdenk	   Verifying Checksum ... OK
2632c609719bSwdenk	   Uncompressing Kernel Image ... OK
2633c609719bSwdenk	## Loading RAMDisk Image at 40200000 ...
2634c609719bSwdenk	   Image Name:	 Simple Ramdisk Image
2635c609719bSwdenk	   Image Type:	 PowerPC Linux RAMDisk Image (gzip compressed)
2636c609719bSwdenk	   Data Size:	 566530 Bytes = 553 kB = 0 MB
2637c609719bSwdenk	   Load Address: 00000000
2638c609719bSwdenk	   Entry Point:	 00000000
2639c609719bSwdenk	   Verifying Checksum ... OK
2640c609719bSwdenk	   Loading Ramdisk ... OK
2641c609719bSwdenk	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
2642c609719bSwdenk	Boot arguments: root=/dev/ram
2643c609719bSwdenk	time_init: decrementer frequency = 187500000/60
2644c609719bSwdenk	Calibrating delay loop... 49.77 BogoMIPS
2645c609719bSwdenk	...
2646c609719bSwdenk	RAMDISK: Compressed image found at block 0
2647c609719bSwdenk	VFS: Mounted root (ext2 filesystem).
2648c609719bSwdenk
2649c609719bSwdenk	bash#
2650c609719bSwdenk
26516069ff26SwdenkMore About U-Boot Image Types:
26526069ff26Swdenk------------------------------
26536069ff26Swdenk
26546069ff26SwdenkU-Boot supports the following image types:
26556069ff26Swdenk
26566069ff26Swdenk   "Standalone Programs" are directly runnable in the environment
26576069ff26Swdenk	provided by U-Boot; it is expected that (if they behave
26586069ff26Swdenk	well) you can continue to work in U-Boot after return from
26596069ff26Swdenk	the Standalone Program.
26606069ff26Swdenk   "OS Kernel Images" are usually images of some Embedded OS which
26616069ff26Swdenk	will take over control completely. Usually these programs
26626069ff26Swdenk	will install their own set of exception handlers, device
26636069ff26Swdenk	drivers, set up the MMU, etc. - this means, that you cannot
26646069ff26Swdenk	expect to re-enter U-Boot except by resetting the CPU.
26656069ff26Swdenk   "RAMDisk Images" are more or less just data blocks, and their
26666069ff26Swdenk	parameters (address, size) are passed to an OS kernel that is
26676069ff26Swdenk	being started.
26686069ff26Swdenk   "Multi-File Images" contain several images, typically an OS
26696069ff26Swdenk	(Linux) kernel image and one or more data images like
26706069ff26Swdenk	RAMDisks. This construct is useful for instance when you want
26716069ff26Swdenk	to boot over the network using BOOTP etc., where the boot
26726069ff26Swdenk	server provides just a single image file, but you want to get
26736069ff26Swdenk	for instance an OS kernel and a RAMDisk image.
26746069ff26Swdenk
26756069ff26Swdenk	"Multi-File Images" start with a list of image sizes, each
26766069ff26Swdenk	image size (in bytes) specified by an "uint32_t" in network
26776069ff26Swdenk	byte order. This list is terminated by an "(uint32_t)0".
26786069ff26Swdenk	Immediately after the terminating 0 follow the images, one by
26796069ff26Swdenk	one, all aligned on "uint32_t" boundaries (size rounded up to
26806069ff26Swdenk	a multiple of 4 bytes).
26816069ff26Swdenk
26826069ff26Swdenk   "Firmware Images" are binary images containing firmware (like
26836069ff26Swdenk	U-Boot or FPGA images) which usually will be programmed to
26846069ff26Swdenk	flash memory.
26856069ff26Swdenk
26866069ff26Swdenk   "Script files" are command sequences that will be executed by
26876069ff26Swdenk	U-Boot's command interpreter; this feature is especially
26886069ff26Swdenk	useful when you configure U-Boot to use a real shell (hush)
26896069ff26Swdenk	as command interpreter.
26906069ff26Swdenk
2691c609719bSwdenk
2692c609719bSwdenkStandalone HOWTO:
2693c609719bSwdenk=================
2694c609719bSwdenk
2695c609719bSwdenkOne of the features of U-Boot is that you can dynamically load and
2696c609719bSwdenkrun "standalone" applications, which can use some resources of
2697c609719bSwdenkU-Boot like console I/O functions or interrupt services.
2698c609719bSwdenk
2699c609719bSwdenkTwo simple examples are included with the sources:
2700c609719bSwdenk
2701c609719bSwdenk"Hello World" Demo:
2702c609719bSwdenk-------------------
2703c609719bSwdenk
2704c609719bSwdenk'examples/hello_world.c' contains a small "Hello World" Demo
2705c609719bSwdenkapplication; it is automatically compiled when you build U-Boot.
2706c609719bSwdenkIt's configured to run at address 0x00040004, so you can play with it
2707c609719bSwdenklike that:
2708c609719bSwdenk
2709c609719bSwdenk	=> loads
2710c609719bSwdenk	## Ready for S-Record download ...
2711c609719bSwdenk	~>examples/hello_world.srec
2712c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 ...
2713c609719bSwdenk	[file transfer complete]
2714c609719bSwdenk	[connected]
2715c609719bSwdenk	## Start Addr = 0x00040004
2716c609719bSwdenk
2717c609719bSwdenk	=> go 40004 Hello World! This is a test.
2718c609719bSwdenk	## Starting application at 0x00040004 ...
2719c609719bSwdenk	Hello World
2720c609719bSwdenk	argc = 7
2721c609719bSwdenk	argv[0] = "40004"
2722c609719bSwdenk	argv[1] = "Hello"
2723c609719bSwdenk	argv[2] = "World!"
2724c609719bSwdenk	argv[3] = "This"
2725c609719bSwdenk	argv[4] = "is"
2726c609719bSwdenk	argv[5] = "a"
2727c609719bSwdenk	argv[6] = "test."
2728c609719bSwdenk	argv[7] = "<NULL>"
2729c609719bSwdenk	Hit any key to exit ...
2730c609719bSwdenk
2731c609719bSwdenk	## Application terminated, rc = 0x0
2732c609719bSwdenk
2733c609719bSwdenkAnother example, which demonstrates how to register a CPM interrupt
2734c609719bSwdenkhandler with the U-Boot code, can be found in 'examples/timer.c'.
2735c609719bSwdenkHere, a CPM timer is set up to generate an interrupt every second.
2736c609719bSwdenkThe interrupt service routine is trivial, just printing a '.'
2737c609719bSwdenkcharacter, but this is just a demo program. The application can be
2738c609719bSwdenkcontrolled by the following keys:
2739c609719bSwdenk
2740c609719bSwdenk	? - print current values og the CPM Timer registers
2741c609719bSwdenk	b - enable interrupts and start timer
2742c609719bSwdenk	e - stop timer and disable interrupts
2743c609719bSwdenk	q - quit application
2744c609719bSwdenk
2745c609719bSwdenk	=> loads
2746c609719bSwdenk	## Ready for S-Record download ...
2747c609719bSwdenk	~>examples/timer.srec
2748c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 ...
2749c609719bSwdenk	[file transfer complete]
2750c609719bSwdenk	[connected]
2751c609719bSwdenk	## Start Addr = 0x00040004
2752c609719bSwdenk
2753c609719bSwdenk	=> go 40004
2754c609719bSwdenk	## Starting application at 0x00040004 ...
2755c609719bSwdenk	TIMERS=0xfff00980
2756c609719bSwdenk	Using timer 1
2757c609719bSwdenk	  tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0
2758c609719bSwdenk
2759c609719bSwdenkHit 'b':
2760c609719bSwdenk	[q, b, e, ?] Set interval 1000000 us
2761c609719bSwdenk	Enabling timer
2762c609719bSwdenkHit '?':
2763c609719bSwdenk	[q, b, e, ?] ........
2764c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0
2765c609719bSwdenkHit '?':
2766c609719bSwdenk	[q, b, e, ?] .
2767c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0
2768c609719bSwdenkHit '?':
2769c609719bSwdenk	[q, b, e, ?] .
2770c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0
2771c609719bSwdenkHit '?':
2772c609719bSwdenk	[q, b, e, ?] .
2773c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0
2774c609719bSwdenkHit 'e':
2775c609719bSwdenk	[q, b, e, ?] ...Stopping timer
2776c609719bSwdenkHit 'q':
2777c609719bSwdenk	[q, b, e, ?] ## Application terminated, rc = 0x0
2778c609719bSwdenk
2779c609719bSwdenk
278085ec0bccSwdenkMinicom warning:
278185ec0bccSwdenk================
278285ec0bccSwdenk
27837152b1d0SwdenkOver time, many people have reported problems when trying to use the
278485ec0bccSwdenk"minicom" terminal emulation program for serial download. I (wd)
278585ec0bccSwdenkconsider minicom to be broken, and recommend not to use it. Under
2786f07771ccSwdenkUnix, I recommend to use C-Kermit for general purpose use (and
278785ec0bccSwdenkespecially for kermit binary protocol download ("loadb" command), and
278885ec0bccSwdenkuse "cu" for S-Record download ("loads" command).
278985ec0bccSwdenk
279052f52c14SwdenkNevertheless, if you absolutely want to use it try adding this
279152f52c14Swdenkconfiguration to your "File transfer protocols" section:
279252f52c14Swdenk
279352f52c14Swdenk	   Name    Program                      Name U/D FullScr IO-Red. Multi
279452f52c14Swdenk	X  kermit  /usr/bin/kermit -i -l %l -s   Y    U    Y       N      N
279552f52c14Swdenk	Y  kermit  /usr/bin/kermit -i -l %l -r   N    D    Y       N      N
279652f52c14Swdenk
279752f52c14Swdenk
2798c609719bSwdenkNetBSD Notes:
2799c609719bSwdenk=============
2800c609719bSwdenk
2801c609719bSwdenkStarting at version 0.9.2, U-Boot supports NetBSD both as host
2802c609719bSwdenk(build U-Boot) and target system (boots NetBSD/mpc8xx).
2803c609719bSwdenk
2804c609719bSwdenkBuilding requires a cross environment; it is known to work on
2805c609719bSwdenkNetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also
2806c609719bSwdenkneed gmake since the Makefiles are not compatible with BSD make).
2807c609719bSwdenkNote that the cross-powerpc package does not install include files;
2808c609719bSwdenkattempting to build U-Boot will fail because <machine/ansi.h> is
2809c609719bSwdenkmissing.  This file has to be installed and patched manually:
2810c609719bSwdenk
2811c609719bSwdenk	# cd /usr/pkg/cross/powerpc-netbsd/include
2812c609719bSwdenk	# mkdir powerpc
2813c609719bSwdenk	# ln -s powerpc machine
2814c609719bSwdenk	# cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h
2815c609719bSwdenk	# ${EDIT} powerpc/ansi.h	## must remove __va_list, _BSD_VA_LIST
2816c609719bSwdenk
2817c609719bSwdenkNative builds *don't* work due to incompatibilities between native
2818c609719bSwdenkand U-Boot include files.
2819c609719bSwdenk
2820c609719bSwdenkBooting assumes that (the first part of) the image booted is a
2821c609719bSwdenkstage-2 loader which in turn loads and then invokes the kernel
2822c609719bSwdenkproper. Loader sources will eventually appear in the NetBSD source
2823c609719bSwdenktree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the
2824c609719bSwdenkmeantime, send mail to bruno@exet-ag.de and/or wd@denx.de for
2825c609719bSwdenkdetails.
2826c609719bSwdenk
2827c609719bSwdenk
2828c609719bSwdenkImplementation Internals:
2829c609719bSwdenk=========================
2830c609719bSwdenk
2831c609719bSwdenkThe following is not intended to be a complete description of every
2832c609719bSwdenkimplementation detail. However, it should help to understand the
2833c609719bSwdenkinner workings of U-Boot and make it easier to port it to custom
2834c609719bSwdenkhardware.
2835c609719bSwdenk
2836c609719bSwdenk
2837c609719bSwdenkInitial Stack, Global Data:
2838c609719bSwdenk---------------------------
2839c609719bSwdenk
2840c609719bSwdenkThe implementation of U-Boot is complicated by the fact that U-Boot
2841c609719bSwdenkstarts running out of ROM (flash memory), usually without access to
2842c609719bSwdenksystem RAM (because the memory controller is not initialized yet).
2843c609719bSwdenkThis means that we don't have writable Data or BSS segments, and BSS
2844c609719bSwdenkis not initialized as zero. To be able to get a C environment working
2845c609719bSwdenkat all, we have to allocate at least a minimal stack. Implementation
2846c609719bSwdenkoptions for this are defined and restricted by the CPU used: Some CPU
2847c609719bSwdenkmodels provide on-chip memory (like the IMMR area on MPC8xx and
2848c609719bSwdenkMPC826x processors), on others (parts of) the data cache can be
2849c609719bSwdenklocked as (mis-) used as memory, etc.
2850c609719bSwdenk
28517152b1d0Swdenk	Chris Hallinan posted a good summary of  these  issues  to  the
285243d9616cSwdenk	u-boot-users mailing list:
285343d9616cSwdenk
285443d9616cSwdenk	Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)?
285543d9616cSwdenk	From: "Chris Hallinan" <clh@net1plus.com>
285643d9616cSwdenk	Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET)
285743d9616cSwdenk	...
285843d9616cSwdenk
285943d9616cSwdenk	Correct me if I'm wrong, folks, but the way I understand it
286043d9616cSwdenk	is this: Using DCACHE as initial RAM for Stack, etc, does not
286143d9616cSwdenk	require any physical RAM backing up the cache. The cleverness
286243d9616cSwdenk	is that the cache is being used as a temporary supply of
286343d9616cSwdenk	necessary storage before the SDRAM controller is setup. It's
286443d9616cSwdenk	beyond the scope of this list to expain the details, but you
286543d9616cSwdenk	can see how this works by studying the cache architecture and
286643d9616cSwdenk	operation in the architecture and processor-specific manuals.
286743d9616cSwdenk
286843d9616cSwdenk	OCM is On Chip Memory, which I believe the 405GP has 4K. It
286943d9616cSwdenk	is another option for the system designer to use as an
287043d9616cSwdenk	initial stack/ram area prior to SDRAM being available. Either
287143d9616cSwdenk	option should work for you. Using CS 4 should be fine if your
287243d9616cSwdenk	board designers haven't used it for something that would
287343d9616cSwdenk	cause you grief during the initial boot! It is frequently not
287443d9616cSwdenk	used.
287543d9616cSwdenk
287643d9616cSwdenk	CFG_INIT_RAM_ADDR should be somewhere that won't interfere
287743d9616cSwdenk	with your processor/board/system design. The default value
287843d9616cSwdenk	you will find in any recent u-boot distribution in
287943d9616cSwdenk	Walnut405.h should work for you. I'd set it to a value larger
288043d9616cSwdenk	than your SDRAM module. If you have a 64MB SDRAM module, set
288143d9616cSwdenk	it above 400_0000. Just make sure your board has no resources
288243d9616cSwdenk	that are supposed to respond to that address! That code in
288343d9616cSwdenk	start.S has been around a while and should work as is when
288443d9616cSwdenk	you get the config right.
288543d9616cSwdenk
288643d9616cSwdenk	-Chris Hallinan
288743d9616cSwdenk	DS4.COM, Inc.
288843d9616cSwdenk
2889c609719bSwdenkIt is essential to remember this, since it has some impact on the C
2890c609719bSwdenkcode for the initialization procedures:
2891c609719bSwdenk
2892c609719bSwdenk* Initialized global data (data segment) is read-only. Do not attempt
2893c609719bSwdenk  to write it.
2894c609719bSwdenk
2895c609719bSwdenk* Do not use any unitialized global data (or implicitely initialized
2896c609719bSwdenk  as zero data - BSS segment) at all - this is undefined, initiali-
28977152b1d0Swdenk  zation is performed later (when relocating to RAM).
2898c609719bSwdenk
2899c609719bSwdenk* Stack space is very limited. Avoid big data buffers or things like
2900c609719bSwdenk  that.
2901c609719bSwdenk
2902c609719bSwdenkHaving only the stack as writable memory limits means we cannot use
2903c609719bSwdenknormal global data to share information beween the code. But it
2904c609719bSwdenkturned out that the implementation of U-Boot can be greatly
2905c609719bSwdenksimplified by making a global data structure (gd_t) available to all
2906c609719bSwdenkfunctions. We could pass a pointer to this data as argument to _all_
2907c609719bSwdenkfunctions, but this would bloat the code. Instead we use a feature of
2908c609719bSwdenkthe GCC compiler (Global Register Variables) to share the data: we
2909c609719bSwdenkplace a pointer (gd) to the global data into a register which we
2910c609719bSwdenkreserve for this purpose.
2911c609719bSwdenk
29127152b1d0SwdenkWhen choosing a register for such a purpose we are restricted by the
2913c609719bSwdenkrelevant  (E)ABI  specifications for the current architecture, and by
2914c609719bSwdenkGCC's implementation.
2915c609719bSwdenk
2916c609719bSwdenkFor PowerPC, the following registers have specific use:
2917c609719bSwdenk	R1:	stack pointer
2918c609719bSwdenk	R2:	TOC pointer
2919c609719bSwdenk	R3-R4:	parameter passing and return values
2920c609719bSwdenk	R5-R10:	parameter passing
2921c609719bSwdenk	R13:	small data area pointer
2922c609719bSwdenk	R30:	GOT pointer
2923c609719bSwdenk	R31:	frame pointer
2924c609719bSwdenk
2925c609719bSwdenk	(U-Boot also uses R14 as internal GOT pointer.)
2926c609719bSwdenk
2927c609719bSwdenk    ==> U-Boot will use R29 to hold a pointer to the global data
2928c609719bSwdenk
2929c609719bSwdenk    Note: on PPC, we could use a static initializer (since the
2930c609719bSwdenk    address of the global data structure is known at compile time),
2931c609719bSwdenk    but it turned out that reserving a register results in somewhat
2932c609719bSwdenk    smaller code - although the code savings are not that big (on
2933c609719bSwdenk    average for all boards 752 bytes for the whole U-Boot image,
2934c609719bSwdenk    624 text + 127 data).
2935c609719bSwdenk
2936c609719bSwdenkOn ARM, the following registers are used:
2937c609719bSwdenk
2938c609719bSwdenk	R0:	function argument word/integer result
2939c609719bSwdenk	R1-R3:	function argument word
2940c609719bSwdenk	R9:	GOT pointer
2941c609719bSwdenk	R10:	stack limit (used only if stack checking if enabled)
2942c609719bSwdenk	R11:	argument (frame) pointer
2943c609719bSwdenk	R12:	temporary workspace
2944c609719bSwdenk	R13:	stack pointer
2945c609719bSwdenk	R14:	link register
2946c609719bSwdenk	R15:	program counter
2947c609719bSwdenk
2948c609719bSwdenk    ==> U-Boot will use R8 to hold a pointer to the global data
2949c609719bSwdenk
2950c609719bSwdenk
2951c609719bSwdenkMemory Management:
2952c609719bSwdenk------------------
2953c609719bSwdenk
2954c609719bSwdenkU-Boot runs in system state and uses physical addresses, i.e. the
2955c609719bSwdenkMMU is not used either for address mapping nor for memory protection.
2956c609719bSwdenk
2957c609719bSwdenkThe available memory is mapped to fixed addresses using the memory
2958c609719bSwdenkcontroller. In this process, a contiguous block is formed for each
2959c609719bSwdenkmemory type (Flash, SDRAM, SRAM), even when it consists of several
2960c609719bSwdenkphysical memory banks.
2961c609719bSwdenk
2962c609719bSwdenkU-Boot is installed in the first 128 kB of the first Flash bank (on
2963c609719bSwdenkTQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After
2964c609719bSwdenkbooting and sizing and initializing DRAM, the code relocates itself
2965c609719bSwdenkto the upper end of DRAM. Immediately below the U-Boot code some
2966c609719bSwdenkmemory is reserved for use by malloc() [see CFG_MALLOC_LEN
2967c609719bSwdenkconfiguration setting]. Below that, a structure with global Board
2968c609719bSwdenkInfo data is placed, followed by the stack (growing downward).
2969c609719bSwdenk
2970c609719bSwdenkAdditionally, some exception handler code is copied to the low 8 kB
2971c609719bSwdenkof DRAM (0x00000000 ... 0x00001FFF).
2972c609719bSwdenk
2973c609719bSwdenkSo a typical memory configuration with 16 MB of DRAM could look like
2974c609719bSwdenkthis:
2975c609719bSwdenk
2976c609719bSwdenk	0x0000 0000	Exception Vector code
2977c609719bSwdenk	      :
2978c609719bSwdenk	0x0000 1FFF
2979c609719bSwdenk	0x0000 2000	Free for Application Use
2980c609719bSwdenk	      :
2981c609719bSwdenk	      :
2982c609719bSwdenk
2983c609719bSwdenk	      :
2984c609719bSwdenk	      :
2985c609719bSwdenk	0x00FB FF20	Monitor Stack (Growing downward)
2986c609719bSwdenk	0x00FB FFAC	Board Info Data and permanent copy of global data
2987c609719bSwdenk	0x00FC 0000	Malloc Arena
2988c609719bSwdenk	      :
2989c609719bSwdenk	0x00FD FFFF
2990c609719bSwdenk	0x00FE 0000	RAM Copy of Monitor Code
2991c609719bSwdenk	...		eventually: LCD or video framebuffer
2992c609719bSwdenk	...		eventually: pRAM (Protected RAM - unchanged by reset)
2993c609719bSwdenk	0x00FF FFFF	[End of RAM]
2994c609719bSwdenk
2995c609719bSwdenk
2996c609719bSwdenkSystem Initialization:
2997c609719bSwdenk----------------------
2998c609719bSwdenk
2999c609719bSwdenkIn the reset configuration, U-Boot starts at the reset entry point
3000c609719bSwdenk(on most PowerPC systens at address 0x00000100). Because of the reset
3001c609719bSwdenkconfiguration for CS0# this is a mirror of the onboard Flash memory.
30027152b1d0SwdenkTo be able to re-map memory U-Boot then jumps to its link address.
3003c609719bSwdenkTo be able to implement the initialization code in C, a (small!)
3004c609719bSwdenkinitial stack is set up in the internal Dual Ported RAM (in case CPUs
3005c609719bSwdenkwhich provide such a feature like MPC8xx or MPC8260), or in a locked
3006c609719bSwdenkpart of the data cache. After that, U-Boot initializes the CPU core,
3007c609719bSwdenkthe caches and the SIU.
3008c609719bSwdenk
3009c609719bSwdenkNext, all (potentially) available memory banks are mapped using a
3010c609719bSwdenkpreliminary mapping. For example, we put them on 512 MB boundaries
3011c609719bSwdenk(multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash
3012c609719bSwdenkon 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is
3013c609719bSwdenkprogrammed for SDRAM access. Using the temporary configuration, a
3014c609719bSwdenksimple memory test is run that determines the size of the SDRAM
3015c609719bSwdenkbanks.
3016c609719bSwdenk
3017c609719bSwdenkWhen there is more than one SDRAM bank, and the banks are of
30187152b1d0Swdenkdifferent size, the largest is mapped first. For equal size, the first
3019c609719bSwdenkbank (CS2#) is mapped first. The first mapping is always for address
3020c609719bSwdenk0x00000000, with any additional banks following immediately to create
3021c609719bSwdenkcontiguous memory starting from 0.
3022c609719bSwdenk
3023c609719bSwdenkThen, the monitor installs itself at the upper end of the SDRAM area
3024c609719bSwdenkand allocates memory for use by malloc() and for the global Board
3025c609719bSwdenkInfo data; also, the exception vector code is copied to the low RAM
3026c609719bSwdenkpages, and the final stack is set up.
3027c609719bSwdenk
3028c609719bSwdenkOnly after this relocation will you have a "normal" C environment;
3029c609719bSwdenkuntil that you are restricted in several ways, mostly because you are
3030c609719bSwdenkrunning from ROM, and because the code will have to be relocated to a
3031c609719bSwdenknew address in RAM.
3032c609719bSwdenk
3033c609719bSwdenk
3034c609719bSwdenkU-Boot Porting Guide:
3035c609719bSwdenk----------------------
3036c609719bSwdenk
3037c609719bSwdenk[Based on messages by Jerry Van Baren in the U-Boot-Users mailing
30386aff3115Swdenklist, October 2002]
3039c609719bSwdenk
3040c609719bSwdenk
3041c609719bSwdenkint main (int argc, char *argv[])
3042c609719bSwdenk{
3043c609719bSwdenk	sighandler_t no_more_time;
3044c609719bSwdenk
3045c609719bSwdenk	signal (SIGALRM, no_more_time);
3046c609719bSwdenk	alarm (PROJECT_DEADLINE - toSec (3 * WEEK));
3047c609719bSwdenk
3048c609719bSwdenk	if (available_money > available_manpower) {
3049c609719bSwdenk		pay consultant to port U-Boot;
3050c609719bSwdenk		return 0;
3051c609719bSwdenk	}
3052c609719bSwdenk
3053c609719bSwdenk	Download latest U-Boot source;
3054c609719bSwdenk
30556aff3115Swdenk	Subscribe to u-boot-users mailing list;
30566aff3115Swdenk
3057c609719bSwdenk	if (clueless) {
3058c609719bSwdenk		email ("Hi, I am new to U-Boot, how do I get started?");
3059c609719bSwdenk	}
3060c609719bSwdenk
3061c609719bSwdenk	while (learning) {
3062c609719bSwdenk		Read the README file in the top level directory;
3063c609719bSwdenk		Read http://www.denx.de/re/DPLG.html
3064c609719bSwdenk		Read the source, Luke;
3065c609719bSwdenk	}
3066c609719bSwdenk
3067c609719bSwdenk	if (available_money > toLocalCurrency ($2500)) {
3068c609719bSwdenk		Buy a BDI2000;
3069c609719bSwdenk	} else {
3070c609719bSwdenk		Add a lot of aggravation and time;
3071c609719bSwdenk	}
3072c609719bSwdenk
3073c609719bSwdenk	Create your own board support subdirectory;
3074c609719bSwdenk
30756aff3115Swdenk	Create your own board config file;
30766aff3115Swdenk
3077c609719bSwdenk	while (!running) {
3078c609719bSwdenk		do {
3079c609719bSwdenk			Add / modify source code;
3080c609719bSwdenk		} until (compiles);
3081c609719bSwdenk		Debug;
3082c609719bSwdenk		if (clueless)
3083c609719bSwdenk			email ("Hi, I am having problems...");
3084c609719bSwdenk	}
3085c609719bSwdenk	Send patch file to Wolfgang;
3086c609719bSwdenk
3087c609719bSwdenk	return 0;
3088c609719bSwdenk}
3089c609719bSwdenk
3090c609719bSwdenkvoid no_more_time (int sig)
3091c609719bSwdenk{
3092c609719bSwdenk      hire_a_guru();
3093c609719bSwdenk}
3094c609719bSwdenk
3095c609719bSwdenk
3096c609719bSwdenkCoding Standards:
3097c609719bSwdenk-----------------
3098c609719bSwdenk
3099c609719bSwdenkAll contributions to U-Boot should conform to the Linux kernel
3100c609719bSwdenkcoding style; see the file "Documentation/CodingStyle" in your Linux
3101c609719bSwdenkkernel source directory.
3102c609719bSwdenk
3103c609719bSwdenkPlease note that U-Boot is implemented in C (and to some small parts
3104c609719bSwdenkin Assembler); no C++ is used, so please do not use C++ style
3105c609719bSwdenkcomments (//) in your code.
3106c609719bSwdenk
3107c609719bSwdenkSubmissions which do not conform to the standards may be returned
3108c609719bSwdenkwith a request to reformat the changes.
3109c609719bSwdenk
3110c609719bSwdenk
3111c609719bSwdenkSubmitting Patches:
3112c609719bSwdenk-------------------
3113c609719bSwdenk
3114c609719bSwdenkSince the number of patches for U-Boot is growing, we need to
3115c609719bSwdenkestablish some rules. Submissions which do not conform to these rules
3116c609719bSwdenkmay be rejected, even when they contain important and valuable stuff.
3117c609719bSwdenk
3118c609719bSwdenk
3119c609719bSwdenkWhen you send a patch, please include the following information with
3120c609719bSwdenkit:
3121c609719bSwdenk
3122c609719bSwdenk* For bug fixes: a description of the bug and how your patch fixes
3123c609719bSwdenk  this bug. Please try to include a way of demonstrating that the
3124c609719bSwdenk  patch actually fixes something.
3125c609719bSwdenk
3126c609719bSwdenk* For new features: a description of the feature and your
3127c609719bSwdenk  implementation.
3128c609719bSwdenk
3129c609719bSwdenk* A CHANGELOG entry as plaintext (separate from the patch)
3130c609719bSwdenk
3131c609719bSwdenk* For major contributions, your entry to the CREDITS file
3132c609719bSwdenk
3133c609719bSwdenk* When you add support for a new board, don't forget to add this
3134c609719bSwdenk  board to the MAKEALL script, too.
3135c609719bSwdenk
3136c609719bSwdenk* If your patch adds new configuration options, don't forget to
3137c609719bSwdenk  document these in the README file.
3138c609719bSwdenk
3139c609719bSwdenk* The patch itself. If you are accessing the CVS repository use "cvs
3140c609719bSwdenk  update; cvs diff -puRN"; else, use "diff -purN OLD NEW". If your
3141c609719bSwdenk  version of diff does not support these options, then get the latest
3142c609719bSwdenk  version of GNU diff.
3143c609719bSwdenk
31446dff5529Swdenk  The current directory when running this command shall be the top
31456dff5529Swdenk  level directory of the U-Boot source tree, or it's parent directory
31466dff5529Swdenk  (i. e. please make sure that your patch includes sufficient
31476dff5529Swdenk  directory information for the affected files).
31486dff5529Swdenk
3149c609719bSwdenk  We accept patches as plain text, MIME attachments or as uuencoded
3150c609719bSwdenk  gzipped text.
3151c609719bSwdenk
315252f52c14Swdenk* If one logical set of modifications affects or creates several
315352f52c14Swdenk  files, all these changes shall be submitted in a SINGLE patch file.
315452f52c14Swdenk
315552f52c14Swdenk* Changesets that contain different, unrelated modifications shall be
315652f52c14Swdenk  submitted as SEPARATE patches, one patch per changeset.
315752f52c14Swdenk
315852f52c14Swdenk
3159c609719bSwdenkNotes:
3160c609719bSwdenk
3161c609719bSwdenk* Before sending the patch, run the MAKEALL script on your patched
3162c609719bSwdenk  source tree and make sure that no errors or warnings are reported
3163c609719bSwdenk  for any of the boards.
3164c609719bSwdenk
3165c609719bSwdenk* Keep your modifications to the necessary minimum: A patch
3166c609719bSwdenk  containing several unrelated changes or arbitrary reformats will be
3167c609719bSwdenk  returned with a request to re-formatting / split it.
3168c609719bSwdenk
3169c609719bSwdenk* If you modify existing code, make sure that your new code does not
3170c609719bSwdenk  add to the memory footprint of the code ;-) Small is beautiful!
3171c609719bSwdenk  When adding new features, these should compile conditionally only
3172c609719bSwdenk  (using #ifdef), and the resulting code with the new feature
3173c609719bSwdenk  disabled must not need more memory than the old code without your
3174c609719bSwdenk  modification.
3175