xref: /openbmc/u-boot/README (revision 8564acf936726c5568d71e4fa93a0ae9814e0d07)
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
122c609719bSwdenk- board		Board dependend files
123c609719bSwdenk- common	Misc architecture independend functions
124c609719bSwdenk- cpu		CPU specific files
125c609719bSwdenk- disk		Code for disk drive partition handling
126c609719bSwdenk- doc		Documentation (don't expect too much)
127c609719bSwdenk- drivers	Common 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
1430db5bca8Swdenk- cpu/mpc5xx	Files specific to Motorola MPC5xx  CPUs
144c609719bSwdenk- cpu/mpc8xx	Files specific to Motorola MPC8xx  CPUs
145c609719bSwdenk- cpu/mpc824x	Files specific to Motorola MPC824x CPUs
146c609719bSwdenk- cpu/mpc8260	Files specific to Motorola MPC8260 CPU
147c609719bSwdenk- cpu/ppc4xx	Files specific to IBM	   4xx	   CPUs
148c609719bSwdenk
1493bac3513Swdenk- board/LEOX/   Files specific to boards manufactured by The LEOX team
1503bac3513Swdenk- board/LEOX/elpt860	Files specific to ELPT860 boards
151c609719bSwdenk- board/RPXClassic
152c609719bSwdenk		Files specific to RPXClassic boards
153c609719bSwdenk- board/RPXlite	Files specific to RPXlite    boards
1542abbe075Swdenk- board/at91rm9200dk Files specific to AT91RM9200DK boards
155c609719bSwdenk- board/c2mon	Files specific to c2mon	     boards
1560db5bca8Swdenk- board/cmi	Files specific to cmi        boards
157c609719bSwdenk- board/cogent	Files specific to Cogent     boards
158c609719bSwdenk		(need further configuration)
159c609719bSwdenk		Files specific to CPCIISER4  boards
160c609719bSwdenk- board/cpu86	Files specific to CPU86      boards
161c609719bSwdenk- board/cray/	Files specific to boards manufactured by Cray
162c609719bSwdenk- board/cray/L1		Files specific to L1         boards
163c609719bSwdenk- board/cu824	Files specific to CU824	     boards
164c609719bSwdenk- board/ebony   Files specific to IBM Ebony board
165c609719bSwdenk- board/eric	Files specific to ERIC	     boards
166c609719bSwdenk- board/esd/	Files specific to boards manufactured by ESD
167c609719bSwdenk- board/esd/adciop	Files specific to ADCIOP     boards
168c609719bSwdenk- board/esd/ar405	Files specific to AR405	     boards
169c609719bSwdenk- board/esd/canbt	Files specific to CANBT	     boards
170c609719bSwdenk- board/esd/cpci405	Files specific to CPCI405    boards
171c609719bSwdenk- board/esd/cpciiser4	Files specific to CPCIISER4  boards
172c609719bSwdenk- board/esd/common	Common files for ESD boards
173c609719bSwdenk- board/esd/dasa_sim	Files specific to DASA_SIM   boards
174c609719bSwdenk- board/esd/du405	Files specific to DU405      boards
175c609719bSwdenk- board/esd/ocrtc	Files specific to OCRTC      boards
176c609719bSwdenk- board/esd/pci405	Files specific to PCI405     boards
177c609719bSwdenk- board/esteem192e
178c609719bSwdenk		Files specific to ESTEEM192E boards
179c609719bSwdenk- board/etx094	Files specific to ETX_094    boards
180c609719bSwdenk- board/evb64260
181c609719bSwdenk		Files specific to EVB64260   boards
182c609719bSwdenk- board/fads	Files specific to FADS	     boards
183c609719bSwdenk- board/flagadm Files specific to FLAGADM    boards
1847aa78614Swdenk- board/gen860t Files specific to GEN860T and GEN860T_SC    boards
185c609719bSwdenk- board/genietv Files specific to GENIETV    boards
186c609719bSwdenk- board/gth	Files specific to GTH	     boards
187c609719bSwdenk- board/hermes	Files specific to HERMES     boards
188c609719bSwdenk- board/hymod	Files specific to HYMOD	     boards
189c609719bSwdenk- board/icu862	Files specific to ICU862     boards
190c609719bSwdenk- board/ip860	Files specific to IP860	     boards
191c609719bSwdenk- board/iphase4539
192c609719bSwdenk		Files specific to Interphase4539 boards
193c609719bSwdenk- board/ivm	Files specific to IVMS8/IVML24 boards
194c609719bSwdenk- board/lantec	Files specific to LANTEC     boards
195c609719bSwdenk- board/lwmon	Files specific to LWMON	     boards
196c609719bSwdenk- board/mbx8xx	Files specific to MBX	     boards
197c609719bSwdenk- board/mpc8260ads
198c609719bSwdenk		Files specific to MMPC8260ADS boards
199c609719bSwdenk- board/mpl/	Files specific to boards manufactured by MPL
200c609719bSwdenk- board/mpl/common	Common files for MPL boards
201c609719bSwdenk- board/mpl/pip405	Files specific to PIP405     boards
202c609719bSwdenk- board/mpl/mip405	Files specific to MIP405     boards
203c609719bSwdenk- board/musenki	Files specific to MUSEKNI    boards
204c609719bSwdenk- board/mvs1	Files specific to MVS1       boards
205c609719bSwdenk- board/nx823   Files specific to NX823      boards
206c609719bSwdenk- board/oxc	Files specific to OXC        boards
207c609719bSwdenk- board/pcippc2	Files specific to PCIPPC2/PCIPPC6 boards
208c609719bSwdenk- board/pm826	Files specific to PM826      boards
209c609719bSwdenk- board/ppmc8260
210c609719bSwdenk		Files specific to PPMC8260   boards
211c609719bSwdenk- board/rpxsuper
212c609719bSwdenk		Files specific to RPXsuper   boards
213c609719bSwdenk- board/rsdproto
214c609719bSwdenk		Files specific to RSDproto   boards
215c609719bSwdenk- board/sandpoint
216c609719bSwdenk		Files specific to Sandpoint  boards
217c609719bSwdenk- board/sbc8260	Files specific to SBC8260    boards
218c609719bSwdenk- board/sacsng	Files specific to SACSng     boards
219c609719bSwdenk- board/siemens Files specific to boards manufactured by Siemens AG
220c609719bSwdenk- board/siemens/CCM	Files specific to CCM	     boards
221c609719bSwdenk- board/siemens/IAD210	Files specific to IAD210     boards
222c609719bSwdenk- board/siemens/SCM	Files specific to SCM        boards
223c609719bSwdenk- board/siemens/pcu_e	Files specific to PCU_E	     boards
224c609719bSwdenk- board/sixnet	Files specific to SIXNET     boards
225c609719bSwdenk- board/spd8xx	Files specific to SPD8xxTS   boards
226c609719bSwdenk- board/tqm8260 Files specific to TQM8260    boards
227c609719bSwdenk- board/tqm8xx	Files specific to TQM8xxL    boards
228c609719bSwdenk- board/w7o	Files specific to W7O        boards
229c609719bSwdenk- board/walnut405
230c609719bSwdenk		Files specific to Walnut405  boards
231c609719bSwdenk- board/westel/	Files specific to boards manufactured by Westel Wireless
232c609719bSwdenk- board/westel/amx860	Files specific to AMX860     boards
233c609719bSwdenk- board/utx8245	Files specific to UTX8245   boards
234c609719bSwdenk
235c609719bSwdenkSoftware Configuration:
236c609719bSwdenk=======================
237c609719bSwdenk
238c609719bSwdenkConfiguration is usually done using C preprocessor defines; the
239c609719bSwdenkrationale behind that is to avoid dead code whenever possible.
240c609719bSwdenk
241c609719bSwdenkThere are two classes of configuration variables:
242c609719bSwdenk
243c609719bSwdenk* Configuration _OPTIONS_:
244c609719bSwdenk  These are selectable by the user and have names beginning with
245c609719bSwdenk  "CONFIG_".
246c609719bSwdenk
247c609719bSwdenk* Configuration _SETTINGS_:
248c609719bSwdenk  These depend on the hardware etc. and should not be meddled with if
249c609719bSwdenk  you don't know what you're doing; they have names beginning with
250c609719bSwdenk  "CFG_".
251c609719bSwdenk
252c609719bSwdenkLater we will add a configuration tool - probably similar to or even
253c609719bSwdenkidentical to what's used for the Linux kernel. Right now, we have to
254c609719bSwdenkdo the configuration by hand, which means creating some symbolic
255c609719bSwdenklinks and editing some configuration files. We use the TQM8xxL boards
256c609719bSwdenkas an example here.
257c609719bSwdenk
258c609719bSwdenk
259c609719bSwdenkSelection of Processor Architecture and Board Type:
260c609719bSwdenk---------------------------------------------------
261c609719bSwdenk
262c609719bSwdenkFor all supported boards there are ready-to-use default
263c609719bSwdenkconfigurations available; just type "make <board_name>_config".
264c609719bSwdenk
265c609719bSwdenkExample: For a TQM823L module type:
266c609719bSwdenk
267c609719bSwdenk	cd u-boot
268c609719bSwdenk	make TQM823L_config
269c609719bSwdenk
270c609719bSwdenkFor the Cogent platform, you need to specify the cpu type as well;
271c609719bSwdenke.g. "make cogent_mpc8xx_config". And also configure the cogent
272c609719bSwdenkdirectory according to the instructions in cogent/README.
273c609719bSwdenk
274c609719bSwdenk
275c609719bSwdenkConfiguration Options:
276c609719bSwdenk----------------------
277c609719bSwdenk
278c609719bSwdenkConfiguration depends on the combination of board and CPU type; all
279c609719bSwdenksuch information is kept in a configuration file
280c609719bSwdenk"include/configs/<board_name>.h".
281c609719bSwdenk
282c609719bSwdenkExample: For a TQM823L module, all configuration settings are in
283c609719bSwdenk"include/configs/TQM823L.h".
284c609719bSwdenk
285c609719bSwdenk
2867f6c2cbcSwdenkMany of the options are named exactly as the corresponding Linux
2877f6c2cbcSwdenkkernel configuration options. The intention is to make it easier to
2887f6c2cbcSwdenkbuild a config tool - later.
2897f6c2cbcSwdenk
2907f6c2cbcSwdenk
291c609719bSwdenkThe following options need to be configured:
292c609719bSwdenk
293c609719bSwdenk- CPU Type:	Define exactly one of
294c609719bSwdenk
295c609719bSwdenk		PowerPC based CPUs:
296c609719bSwdenk		-------------------
297c609719bSwdenk		CONFIG_MPC823,	CONFIG_MPC850,	CONFIG_MPC855,	CONFIG_MPC860
2980db5bca8Swdenk	or	CONFIG_MPC5xx
299c609719bSwdenk	or	CONFIG_MPC824X, CONFIG_MPC8260
300c609719bSwdenk	or	CONFIG_IOP480
301c609719bSwdenk	or	CONFIG_405GP
302c609719bSwdenk	or	CONFIG_440
303c609719bSwdenk	or	CONFIG_MPC74xx
30472755c71Swdenk	or	CONFIG_750FX
305c609719bSwdenk
306c609719bSwdenk		ARM based CPUs:
307c609719bSwdenk		---------------
308c609719bSwdenk		CONFIG_SA1110
309c609719bSwdenk		CONFIG_ARM7
310c609719bSwdenk		CONFIG_PXA250
311c609719bSwdenk
312c609719bSwdenk
313c609719bSwdenk- Board Type:	Define exactly one of
314c609719bSwdenk
315c609719bSwdenk		PowerPC based boards:
316c609719bSwdenk		---------------------
317c609719bSwdenk
318c609719bSwdenk		CONFIG_ADCIOP,     CONFIG_ICU862      CONFIG_RPXsuper,
319c609719bSwdenk		CONFIG_ADS860,     CONFIG_IP860,      CONFIG_SM850,
320c609719bSwdenk		CONFIG_AMX860,     CONFIG_IPHASE4539, CONFIG_SPD823TS,
321c609719bSwdenk		CONFIG_AR405,      CONFIG_IVML24,     CONFIG_SXNI855T,
322c609719bSwdenk		CONFIG_BAB7xx,     CONFIG_IVML24_128, CONFIG_Sandpoint8240,
323c609719bSwdenk		CONFIG_CANBT,      CONFIG_IVML24_256, CONFIG_Sandpoint8245,
324c609719bSwdenk		CONFIG_CCM,        CONFIG_IVMS8,      CONFIG_TQM823L,
325c609719bSwdenk		CONFIG_CPCI405,    CONFIG_IVMS8_128,  CONFIG_TQM850L,
326c609719bSwdenk		CONFIG_CPCI4052,   CONFIG_IVMS8_256,  CONFIG_TQM855L,
327c609719bSwdenk		CONFIG_CPCIISER4,  CONFIG_LANTEC,     CONFIG_TQM860L,
328c609719bSwdenk		CONFIG_CPU86,      CONFIG_MBX,        CONFIG_TQM8260,
329c609719bSwdenk		CONFIG_CRAYL1,     CONFIG_MBX860T,    CONFIG_TTTech,
330c609719bSwdenk		CONFIG_CU824,      CONFIG_MHPC,       CONFIG_UTX8245,
331c609719bSwdenk		CONFIG_DASA_SIM,   CONFIG_MIP405,     CONFIG_W7OLMC,
332c609719bSwdenk		CONFIG_DU405,      CONFIG_MOUSSE,     CONFIG_W7OLMG,
333c609719bSwdenk		CONFIG_ELPPC,      CONFIG_MPC8260ADS, CONFIG_WALNUT405,
334c609719bSwdenk		CONFIG_ERIC,       CONFIG_MUSENKI,    CONFIG_ZUMA,
335c609719bSwdenk		CONFIG_ESTEEM192E, CONFIG_MVS1,       CONFIG_c2mon,
336c609719bSwdenk		CONFIG_ETX094,     CONFIG_NX823,      CONFIG_cogent_mpc8260,
337c609719bSwdenk		CONFIG_EVB64260,   CONFIG_OCRTC,      CONFIG_cogent_mpc8xx,
338c609719bSwdenk		CONFIG_FADS823,    CONFIG_ORSG,       CONFIG_ep8260,
339c609719bSwdenk		CONFIG_FADS850SAR, CONFIG_OXC,        CONFIG_gw8260,
340c609719bSwdenk		CONFIG_FADS860T,   CONFIG_PCI405,     CONFIG_hermes,
341c609719bSwdenk		CONFIG_FLAGADM,    CONFIG_PCIPPC2,    CONFIG_hymod,
342c609719bSwdenk		CONFIG_FPS850L,    CONFIG_PCIPPC6,    CONFIG_lwmon,
343c609719bSwdenk		CONFIG_GEN860T,    CONFIG_PIP405,     CONFIG_pcu_e,
344c609719bSwdenk		CONFIG_GENIETV,    CONFIG_PM826,      CONFIG_ppmc8260,
345c609719bSwdenk		CONFIG_GTH,        CONFIG_RPXClassic, CONFIG_rsdproto,
346c609719bSwdenk		CONFIG_IAD210,     CONFIG_RPXlite,    CONFIG_sbc8260,
347608c9146Swdenk		CONFIG_EBONY,      CONFIG_sacsng,     CONFIG_FPS860L,
3487f70e853Swdenk		CONFIG_V37,        CONFIG_ELPT860,    CONFIG_CMI,
349682011ffSwdenk		CONFIG_NETVIA,     CONFIG_RBC823
350c609719bSwdenk
351c609719bSwdenk		ARM based boards:
352c609719bSwdenk		-----------------
353c609719bSwdenk
354c609719bSwdenk		CONFIG_HHP_CRADLE,  CONFIG_DNP1110,    CONFIG_EP7312,
355c609719bSwdenk		CONFIG_IMPA7,       CONFIG_LART,       CONFIG_LUBBOCK,
356c609719bSwdenk		CONFIG_SHANNON,     CONFIG_SMDK2400,   CONFIG_SMDK2410,
3572abbe075Swdenk		CONFIG_TRAB,	    CONFIG_AT91RM9200DK
358c609719bSwdenk
359c609719bSwdenk
360c609719bSwdenk- CPU Module Type: (if CONFIG_COGENT is defined)
361c609719bSwdenk		Define exactly one of
362c609719bSwdenk		CONFIG_CMA286_60_OLD
363c609719bSwdenk--- FIXME --- not tested yet:
364c609719bSwdenk		CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P,
365c609719bSwdenk		CONFIG_CMA287_23, CONFIG_CMA287_50
366c609719bSwdenk
367c609719bSwdenk- Motherboard Type: (if CONFIG_COGENT is defined)
368c609719bSwdenk		Define exactly one of
369c609719bSwdenk		CONFIG_CMA101, CONFIG_CMA102
370c609719bSwdenk
371c609719bSwdenk- Motherboard I/O Modules: (if CONFIG_COGENT is defined)
372c609719bSwdenk		Define one or more of
373c609719bSwdenk		CONFIG_CMA302
374c609719bSwdenk
375c609719bSwdenk- Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined)
376c609719bSwdenk		Define one or more of
377c609719bSwdenk		CONFIG_LCD_HEARTBEAT	- update a character position on
378c609719bSwdenk					  the lcd display every second with
379c609719bSwdenk					  a "rotator" |\-/|\-/
380c609719bSwdenk
381c609719bSwdenk- MPC824X Family Member (if CONFIG_MPC824X is defined)
382c609719bSwdenk	Define exactly one of
383c609719bSwdenk	CONFIG_MPC8240, CONFIG_MPC8245
384c609719bSwdenk
385c609719bSwdenk- 8xx CPU Options: (if using an 8xx cpu)
386c609719bSwdenk		Define one or more of
387c609719bSwdenk		CONFIG_8xx_GCLK_FREQ	- if get_gclk_freq() can not work e.g.
388c609719bSwdenk					  no 32KHz reference PIT/RTC clock
389c609719bSwdenk
390c609719bSwdenk- Clock Interface:
391c609719bSwdenk		CONFIG_CLOCKS_IN_MHZ
392c609719bSwdenk
393c609719bSwdenk		U-Boot stores all clock information in Hz
394c609719bSwdenk		internally. For binary compatibility with older Linux
395c609719bSwdenk		kernels (which expect the clocks passed in the
396c609719bSwdenk		bd_info data to be in MHz) the environment variable
397c609719bSwdenk		"clocks_in_mhz" can be defined so that U-Boot
398c609719bSwdenk		converts clock data to MHZ before passing it to the
399c609719bSwdenk		Linux kernel.
400c609719bSwdenk
401c609719bSwdenk		When CONFIG_CLOCKS_IN_MHZ is defined, a definition of
402c609719bSwdenk		"clocks_in_mhz=1" is  automatically  included  in  the
403c609719bSwdenk		default environment.
404c609719bSwdenk
405c609719bSwdenk- Console Interface:
406c609719bSwdenk		Depending on board, define exactly one serial port
407c609719bSwdenk		(like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2,
408c609719bSwdenk		CONFIG_8xx_CONS_SCC1, ...), or switch off the serial
409c609719bSwdenk		console by defining CONFIG_8xx_CONS_NONE
410c609719bSwdenk
411c609719bSwdenk		Note: if CONFIG_8xx_CONS_NONE is defined, the serial
412c609719bSwdenk		port routines must be defined elsewhere
413c609719bSwdenk		(i.e. serial_init(), serial_getc(), ...)
414c609719bSwdenk
415c609719bSwdenk		CONFIG_CFB_CONSOLE
416c609719bSwdenk		Enables console device for a color framebuffer. Needs following
417c609719bSwdenk		defines (cf. smiLynxEM, i8042, board/eltec/bab7xx)
418c609719bSwdenk			VIDEO_FB_LITTLE_ENDIAN	graphic memory organisation
419c609719bSwdenk						(default big endian)
420c609719bSwdenk			VIDEO_HW_RECTFILL	graphic chip supports
421c609719bSwdenk						rectangle fill
422c609719bSwdenk						(cf. smiLynxEM)
423c609719bSwdenk			VIDEO_HW_BITBLT		graphic chip supports
424c609719bSwdenk						bit-blit (cf. smiLynxEM)
425c609719bSwdenk			VIDEO_VISIBLE_COLS	visible pixel columns
426c609719bSwdenk						(cols=pitch)
427c609719bSwdenk			VIDEO_VISIBLE_ROWS      visible pixel rows
428c609719bSwdenk			VIDEO_PIXEL_SIZE        bytes per pixel
429c609719bSwdenk			VIDEO_DATA_FORMAT	graphic data format
430c609719bSwdenk						(0-5, cf. cfb_console.c)
431c609719bSwdenk			VIDEO_FB_ADRS           framebuffer address
432c609719bSwdenk			VIDEO_KBD_INIT_FCT	keyboard int fct
433c609719bSwdenk						(i.e. i8042_kbd_init())
434c609719bSwdenk			VIDEO_TSTC_FCT		test char fct
435c609719bSwdenk						(i.e. i8042_tstc)
436c609719bSwdenk			VIDEO_GETC_FCT		get char fct
437c609719bSwdenk						(i.e. i8042_getc)
438c609719bSwdenk			CONFIG_CONSOLE_CURSOR	cursor drawing on/off
439c609719bSwdenk						(requires blink timer
440c609719bSwdenk						cf. i8042.c)
441c609719bSwdenk			CFG_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c)
442c609719bSwdenk			CONFIG_CONSOLE_TIME	display time/date info in
443c609719bSwdenk						upper right corner
444c609719bSwdenk						(requires CFG_CMD_DATE)
445c609719bSwdenk			CONFIG_VIDEO_LOGO	display Linux logo in
446c609719bSwdenk						upper left corner
447a6c7ad2fSwdenk			CONFIG_VIDEO_BMP_LOGO	use bmp_logo.h instead of
448a6c7ad2fSwdenk						linux_logo.h for logo.
449a6c7ad2fSwdenk						Requires CONFIG_VIDEO_LOGO
450c609719bSwdenk			CONFIG_CONSOLE_EXTRA_INFO
451c609719bSwdenk						addional board info beside
452c609719bSwdenk						the logo
453c609719bSwdenk
454c609719bSwdenk		When CONFIG_CFB_CONSOLE is defined, video console is
455c609719bSwdenk		default i/o. Serial console can be forced with
456c609719bSwdenk		environment 'console=serial'.
457c609719bSwdenk
458c609719bSwdenk- Console Baudrate:
459c609719bSwdenk		CONFIG_BAUDRATE - in bps
460c609719bSwdenk		Select one of the baudrates listed in
461c609719bSwdenk		CFG_BAUDRATE_TABLE, see below.
462c609719bSwdenk
463c609719bSwdenk- Interrupt driven serial port input:
464c609719bSwdenk		CONFIG_SERIAL_SOFTWARE_FIFO
465c609719bSwdenk
466c609719bSwdenk		PPC405GP only.
467c609719bSwdenk		Use an interrupt handler for receiving data on the
468c609719bSwdenk		serial port. It also enables using hardware handshake
469c609719bSwdenk		(RTS/CTS) and UART's built-in FIFO. Set the number of
470c609719bSwdenk		bytes the interrupt driven input buffer should have.
471c609719bSwdenk
472c609719bSwdenk		Set to 0 to disable this feature (this is the default).
473c609719bSwdenk		This will also disable hardware handshake.
474c609719bSwdenk
4751d49b1f3Sstroese- Console UART Number:
4761d49b1f3Sstroese		CONFIG_UART1_CONSOLE
4771d49b1f3Sstroese
4781d49b1f3Sstroese		IBM PPC4xx only.
4791d49b1f3Sstroese		If defined internal UART1 (and not UART0) is used
4801d49b1f3Sstroese		as default U-Boot console.
4811d49b1f3Sstroese
482c609719bSwdenk- Boot Delay:	CONFIG_BOOTDELAY - in seconds
483c609719bSwdenk		Delay before automatically booting the default image;
484c609719bSwdenk		set to -1 to disable autoboot.
485c609719bSwdenk
486c609719bSwdenk		See doc/README.autoboot for these options that
487c609719bSwdenk		work with CONFIG_BOOTDELAY. None are required.
488c609719bSwdenk		CONFIG_BOOT_RETRY_TIME
489c609719bSwdenk		CONFIG_BOOT_RETRY_MIN
490c609719bSwdenk		CONFIG_AUTOBOOT_KEYED
491c609719bSwdenk		CONFIG_AUTOBOOT_PROMPT
492c609719bSwdenk		CONFIG_AUTOBOOT_DELAY_STR
493c609719bSwdenk		CONFIG_AUTOBOOT_STOP_STR
494c609719bSwdenk		CONFIG_AUTOBOOT_DELAY_STR2
495c609719bSwdenk		CONFIG_AUTOBOOT_STOP_STR2
496c609719bSwdenk		CONFIG_ZERO_BOOTDELAY_CHECK
497c609719bSwdenk		CONFIG_RESET_TO_RETRY
498c609719bSwdenk
499c609719bSwdenk- Autoboot Command:
500c609719bSwdenk		CONFIG_BOOTCOMMAND
501c609719bSwdenk		Only needed when CONFIG_BOOTDELAY is enabled;
502c609719bSwdenk		define a command string that is automatically executed
503c609719bSwdenk		when no character is read on the console interface
504c609719bSwdenk		within "Boot Delay" after reset.
505c609719bSwdenk
506c609719bSwdenk		CONFIG_BOOTARGS
507c609719bSwdenk		This can be used to pass arguments to the bootm
508c609719bSwdenk		command. The value of CONFIG_BOOTARGS goes into the
509c609719bSwdenk		environment value "bootargs".
510c609719bSwdenk
511c609719bSwdenk		CONFIG_RAMBOOT and CONFIG_NFSBOOT
512c609719bSwdenk		The value of these goes into the environment as
513c609719bSwdenk		"ramboot" and "nfsboot" respectively, and can be used
514c609719bSwdenk		as a convenience, when switching between booting from
515c609719bSwdenk		ram and nfs.
516c609719bSwdenk
517c609719bSwdenk- Pre-Boot Commands:
518c609719bSwdenk		CONFIG_PREBOOT
519c609719bSwdenk
520c609719bSwdenk		When this option is #defined, the existence of the
521c609719bSwdenk		environment variable "preboot" will be checked
522c609719bSwdenk		immediately before starting the CONFIG_BOOTDELAY
523c609719bSwdenk		countdown and/or running the auto-boot command resp.
524c609719bSwdenk		entering interactive mode.
525c609719bSwdenk
526c609719bSwdenk		This feature is especially useful when "preboot" is
527c609719bSwdenk		automatically generated or modified. For an example
528c609719bSwdenk		see the LWMON board specific code: here "preboot" is
529c609719bSwdenk		modified when the user holds down a certain
530c609719bSwdenk		combination of keys on the (special) keyboard when
531c609719bSwdenk		booting the systems
532c609719bSwdenk
533c609719bSwdenk- Serial Download Echo Mode:
534c609719bSwdenk		CONFIG_LOADS_ECHO
535c609719bSwdenk		If defined to 1, all characters received during a
536c609719bSwdenk		serial download (using the "loads" command) are
537c609719bSwdenk		echoed back. This might be needed by some terminal
538c609719bSwdenk		emulations (like "cu"), but may as well just take
539c609719bSwdenk		time on others. This setting #define's the initial
540c609719bSwdenk		value of the "loads_echo" environment variable.
541c609719bSwdenk
542c609719bSwdenk- Kgdb Serial Baudrate: (if CFG_CMD_KGDB is defined)
543c609719bSwdenk		CONFIG_KGDB_BAUDRATE
544c609719bSwdenk		Select one of the baudrates listed in
545c609719bSwdenk		CFG_BAUDRATE_TABLE, see below.
546c609719bSwdenk
547c609719bSwdenk- Monitor Functions:
548c609719bSwdenk		CONFIG_COMMANDS
549c609719bSwdenk		Most monitor functions can be selected (or
550c609719bSwdenk		de-selected) by adjusting the definition of
551c609719bSwdenk		CONFIG_COMMANDS; to select individual functions,
552c609719bSwdenk		#define CONFIG_COMMANDS by "OR"ing any of the
553c609719bSwdenk		following values:
554c609719bSwdenk
555c609719bSwdenk		#define enables commands:
556c609719bSwdenk		-------------------------
557c609719bSwdenk		CFG_CMD_ASKENV	* ask for env variable
558c609719bSwdenk		CFG_CMD_BDI	  bdinfo
559c609719bSwdenk		CFG_CMD_BEDBUG	  Include BedBug Debugger
560c609719bSwdenk		CFG_CMD_BOOTD	  bootd
561c609719bSwdenk		CFG_CMD_CACHE	  icache, dcache
562c609719bSwdenk		CFG_CMD_CONSOLE	  coninfo
563c609719bSwdenk		CFG_CMD_DATE	* support for RTC, date/time...
564c609719bSwdenk		CFG_CMD_DHCP	  DHCP support
565c609719bSwdenk		CFG_CMD_ECHO	* echo arguments
566c609719bSwdenk		CFG_CMD_EEPROM	* EEPROM read/write support
567c609719bSwdenk		CFG_CMD_ELF	  bootelf, bootvx
568c609719bSwdenk		CFG_CMD_ENV	  saveenv
569c609719bSwdenk		CFG_CMD_FDC	* Floppy Disk Support
57071f95118Swdenk		CFG_CMD_FAT	  FAT partition support
5712262cfeeSwdenk		CFG_CMD_FDOS	* Dos diskette Support
572c609719bSwdenk		CFG_CMD_FLASH	  flinfo, erase, protect
573c609719bSwdenk		CFG_CMD_FPGA	  FPGA device initialization support
574c609719bSwdenk		CFG_CMD_I2C	* I2C serial bus support
575c609719bSwdenk		CFG_CMD_IDE	* IDE harddisk support
576c609719bSwdenk		CFG_CMD_IMI	  iminfo
577c609719bSwdenk		CFG_CMD_IMMAP	* IMMR dump support
578c609719bSwdenk		CFG_CMD_IRQ	* irqinfo
579c609719bSwdenk		CFG_CMD_KGDB	* kgdb
580c609719bSwdenk		CFG_CMD_LOADB	  loadb
581c609719bSwdenk		CFG_CMD_LOADS	  loads
582c609719bSwdenk		CFG_CMD_MEMORY	  md, mm, nm, mw, cp, cmp, crc, base,
583c609719bSwdenk				  loop, mtest
58471f95118Swdenk		CFG_CMD_MMC	  MMC memory mapped support
585c609719bSwdenk		CFG_CMD_MII	  MII utility commands
586c609719bSwdenk		CFG_CMD_NET	  bootp, tftpboot, rarpboot
587c609719bSwdenk		CFG_CMD_PCI	* pciinfo
588c609719bSwdenk		CFG_CMD_PCMCIA	* PCMCIA support
589c609719bSwdenk		CFG_CMD_REGINFO * Register dump
590c609719bSwdenk		CFG_CMD_RUN	  run command in env variable
591c609719bSwdenk		CFG_CMD_SCSI	* SCSI Support
592c609719bSwdenk		CFG_CMD_SETGETDCR Support for DCR Register access (4xx only)
593c609719bSwdenk		CFG_CMD_SPI	* SPI serial bus support
594c609719bSwdenk		CFG_CMD_USB	* USB support
595c609719bSwdenk		CFG_CMD_BSP	* Board SPecific functions
596c609719bSwdenk		-----------------------------------------------
597c609719bSwdenk		CFG_CMD_ALL	all
598c609719bSwdenk
599c609719bSwdenk		CFG_CMD_DFL	Default configuration; at the moment
600c609719bSwdenk				this is includes all commands, except
601c609719bSwdenk				the ones marked with "*" in the list
602c609719bSwdenk				above.
603c609719bSwdenk
604c609719bSwdenk		If you don't define CONFIG_COMMANDS it defaults to
605c609719bSwdenk		CFG_CMD_DFL in include/cmd_confdefs.h. A board can
606c609719bSwdenk		override the default settings in the respective
607c609719bSwdenk		include file.
608c609719bSwdenk
609c609719bSwdenk		EXAMPLE: If you want all functions except of network
610c609719bSwdenk		support you can write:
611c609719bSwdenk
612c609719bSwdenk		#define CONFIG_COMMANDS (CFG_CMD_ALL & ~CFG_CMD_NET)
613c609719bSwdenk
614c609719bSwdenk
615c609719bSwdenk	Note:	Don't enable the "icache" and "dcache" commands
616c609719bSwdenk		(configuration option CFG_CMD_CACHE) unless you know
617c609719bSwdenk		what you (and your U-Boot users) are doing. Data
618c609719bSwdenk		cache cannot be enabled on systems like the 8xx or
619c609719bSwdenk		8260 (where accesses to the IMMR region must be
620c609719bSwdenk		uncached), and it cannot be disabled on all other
621c609719bSwdenk		systems where we (mis-) use the data cache to hold an
622c609719bSwdenk		initial stack and some data.
623c609719bSwdenk
624c609719bSwdenk
625c609719bSwdenk		XXX - this list needs to get updated!
626c609719bSwdenk
627c609719bSwdenk- Watchdog:
628c609719bSwdenk		CONFIG_WATCHDOG
629c609719bSwdenk		If this variable is defined, it enables watchdog
630c609719bSwdenk		support. There must support in the platform specific
631c609719bSwdenk		code for a watchdog. For the 8xx and 8260 CPUs, the
632c609719bSwdenk		SIU Watchdog feature is enabled in the SYPCR
633c609719bSwdenk		register.
634c609719bSwdenk
635c1551ea8Sstroese- U-Boot Version:
636c1551ea8Sstroese		CONFIG_VERSION_VARIABLE
637c1551ea8Sstroese		If this variable is defined, an environment variable
638c1551ea8Sstroese		named "ver" is created by U-Boot showing the U-Boot
639c1551ea8Sstroese		version as printed by the "version" command.
640c1551ea8Sstroese		This variable is readonly.
641c1551ea8Sstroese
642c609719bSwdenk- Real-Time Clock:
643c609719bSwdenk
644c609719bSwdenk		When CFG_CMD_DATE is selected, the type of the RTC
645c609719bSwdenk		has to be selected, too. Define exactly one of the
646c609719bSwdenk		following options:
647c609719bSwdenk
648c609719bSwdenk		CONFIG_RTC_MPC8xx	- use internal RTC of MPC8xx
649c609719bSwdenk		CONFIG_RTC_PCF8563	- use Philips PCF8563 RTC
650c609719bSwdenk		CONFIG_RTC_MC146818	- use MC146818 RTC
6511cb8e980Swdenk		CONFIG_RTC_DS1307	- use Maxim, Inc. DS1307 RTC
652c609719bSwdenk		CONFIG_RTC_DS1337	- use Maxim, Inc. DS1337 RTC
6537f70e853Swdenk		CONFIG_RTC_DS1338	- use Maxim, Inc. DS1338 RTC
6543bac3513Swdenk		CONFIG_RTC_DS164x	- use Dallas DS164x RTC
655c609719bSwdenk
656b37c7e5eSwdenk		Note that if the RTC uses I2C, then the I2C interface
657b37c7e5eSwdenk		must also be configured. See I2C Support, below.
658b37c7e5eSwdenk
659c609719bSwdenk- Timestamp Support:
660c609719bSwdenk
661c609719bSwdenk		When CONFIG_TIMESTAMP is selected, the timestamp
662c609719bSwdenk		(date and time) of an image is printed by image
663c609719bSwdenk		commands like bootm or iminfo. This option is
664c609719bSwdenk		automatically enabled when you select CFG_CMD_DATE .
665c609719bSwdenk
666c609719bSwdenk- Partition Support:
667c609719bSwdenk		CONFIG_MAC_PARTITION and/or CONFIG_DOS_PARTITION
668c609719bSwdenk		and/or CONFIG_ISO_PARTITION
669c609719bSwdenk
670c609719bSwdenk		If IDE or SCSI support	is  enabled  (CFG_CMD_IDE  or
671c609719bSwdenk		CFG_CMD_SCSI) you must configure support for at least
672c609719bSwdenk		one partition type as well.
673c609719bSwdenk
674c609719bSwdenk- IDE Reset method:
675c609719bSwdenk		CONFIG_IDE_RESET_ROUTINE
676c609719bSwdenk
677c609719bSwdenk		Set this to define that instead of a reset Pin, the
678c609719bSwdenk		routine ide_set_reset(int idereset) will be used.
679c609719bSwdenk
680c609719bSwdenk- ATAPI Support:
681c609719bSwdenk		CONFIG_ATAPI
682c609719bSwdenk
683c609719bSwdenk		Set this to enable ATAPI support.
684c609719bSwdenk
685c609719bSwdenk- SCSI Support:
686c609719bSwdenk		At the moment only there is only support for the
687c609719bSwdenk		SYM53C8XX SCSI controller; define
688c609719bSwdenk		CONFIG_SCSI_SYM53C8XX to enable it.
689c609719bSwdenk
690c609719bSwdenk		CFG_SCSI_MAX_LUN [8], CFG_SCSI_MAX_SCSI_ID [7] and
691c609719bSwdenk		CFG_SCSI_MAX_DEVICE [CFG_SCSI_MAX_SCSI_ID *
692c609719bSwdenk		CFG_SCSI_MAX_LUN] can be adjusted to define the
693c609719bSwdenk		maximum numbers of LUNs, SCSI ID's and target
694c609719bSwdenk		devices.
695c609719bSwdenk		CFG_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz)
696c609719bSwdenk
697c609719bSwdenk- NETWORK Support (PCI):
698682011ffSwdenk		CONFIG_E1000
699682011ffSwdenk		Support for Intel 8254x gigabit chips.
700682011ffSwdenk
701c609719bSwdenk		CONFIG_EEPRO100
702c609719bSwdenk		Support for Intel 82557/82559/82559ER chips.
703c609719bSwdenk		Optional CONFIG_EEPRO100_SROM_WRITE enables eeprom
704c609719bSwdenk		write routine for first time initialisation.
705c609719bSwdenk
706c609719bSwdenk		CONFIG_TULIP
707c609719bSwdenk		Support for Digital 2114x chips.
708c609719bSwdenk		Optional CONFIG_TULIP_SELECT_MEDIA for board specific
709c609719bSwdenk		modem chip initialisation (KS8761/QS6611).
710c609719bSwdenk
711c609719bSwdenk		CONFIG_NATSEMI
712c609719bSwdenk		Support for National dp83815 chips.
713c609719bSwdenk
714c609719bSwdenk		CONFIG_NS8382X
715c609719bSwdenk		Support for National dp8382[01] gigabit chips.
716c609719bSwdenk
71745219c46Swdenk- NETWORK Support (other):
71845219c46Swdenk
71945219c46Swdenk		CONFIG_DRIVER_LAN91C96
72045219c46Swdenk		Support for SMSC's LAN91C96 chips.
72145219c46Swdenk
72245219c46Swdenk			CONFIG_LAN91C96_BASE
72345219c46Swdenk			Define this to hold the physical address
72445219c46Swdenk			of the LAN91C96's I/O space
72545219c46Swdenk
72645219c46Swdenk			CONFIG_LAN91C96_USE_32_BIT
72745219c46Swdenk			Define this to enable 32 bit addressing
72845219c46Swdenk
729c609719bSwdenk- USB Support:
730c609719bSwdenk		At the moment only the UHCI host controller is
731c609719bSwdenk		supported (PIP405, MIP405); define
732c609719bSwdenk		CONFIG_USB_UHCI to enable it.
733c609719bSwdenk		define CONFIG_USB_KEYBOARD to enable the USB Keyboard
734c609719bSwdenk		end define CONFIG_USB_STORAGE to enable the USB
735c609719bSwdenk		storage devices.
736c609719bSwdenk		Note:
737c609719bSwdenk		Supported are USB Keyboards and USB Floppy drives
738c609719bSwdenk		(TEAC FD-05PUB).
739c609719bSwdenk
74071f95118Swdenk- MMC Support:
74171f95118Swdenk		The MMC controller on the Intel PXA is supported. To
74271f95118Swdenk		enable this define CONFIG_MMC. The MMC can be
74371f95118Swdenk		accessed from the boot prompt by mapping the device
74471f95118Swdenk		to physical memory similar to flash. Command line is
74571f95118Swdenk		enabled with CFG_CMD_MMC. The MMC driver also works with
74671f95118Swdenk		the FAT fs. This is enabled with CFG_CMD_FAT.
74771f95118Swdenk
748c609719bSwdenk- Keyboard Support:
749c609719bSwdenk		CONFIG_ISA_KEYBOARD
750c609719bSwdenk
751c609719bSwdenk		Define this to enable standard (PC-Style) keyboard
752c609719bSwdenk		support
753c609719bSwdenk
754c609719bSwdenk		CONFIG_I8042_KBD
755c609719bSwdenk		Standard PC keyboard driver with US (is default) and
756c609719bSwdenk		GERMAN key layout (switch via environment 'keymap=de') support.
757c609719bSwdenk		Export function i8042_kbd_init, i8042_tstc and i8042_getc
758c609719bSwdenk		for cfb_console. Supports cursor blinking.
759c609719bSwdenk
760c609719bSwdenk- Video support:
761c609719bSwdenk		CONFIG_VIDEO
762c609719bSwdenk
763c609719bSwdenk		Define this to enable video support (for output to
764c609719bSwdenk		video).
765c609719bSwdenk
766c609719bSwdenk		CONFIG_VIDEO_CT69000
767c609719bSwdenk
768c609719bSwdenk		Enable Chips & Technologies 69000 Video chip
769c609719bSwdenk
770c609719bSwdenk		CONFIG_VIDEO_SMI_LYNXEM
771c609719bSwdenk		Enable Silicon Motion SMI 712/710/810 Video chip
772c609719bSwdenk		Videomode are selected via environment 'videomode' with
773c609719bSwdenk		standard LiLo mode numbers.
774c609719bSwdenk		Following modes are supported  (* is default):
775c609719bSwdenk
776c609719bSwdenk			    800x600  1024x768  1280x1024
777c609719bSwdenk	      256  (8bit)     303*      305       307
778c609719bSwdenk	    65536 (16bit)     314       317       31a
779c609719bSwdenk	16,7 Mill (24bit)     315       318       31b
780c609719bSwdenk		(i.e. setenv videomode 317; saveenv; reset;)
781c609719bSwdenk
782a6c7ad2fSwdenk		CONFIG_VIDEO_SED13806
783a6c7ad2fSwdenk		Enable Epson SED13806 driver. This driver supports 8bpp
784a6c7ad2fSwdenk		and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP
785a6c7ad2fSwdenk		or CONFIG_VIDEO_SED13806_16BPP
786a6c7ad2fSwdenk
787682011ffSwdenk- Keyboard Support:
788682011ffSwdenk		CONFIG_KEYBOARD
789682011ffSwdenk
790682011ffSwdenk		Define this to enable a custom keyboard support.
791682011ffSwdenk		This simply calls drv_keyboard_init() which must be
792682011ffSwdenk		defined in your board-specific files.
793682011ffSwdenk		The only board using this so far is RBC823.
794a6c7ad2fSwdenk
795c609719bSwdenk- LCD Support:	CONFIG_LCD
796c609719bSwdenk
797c609719bSwdenk		Define this to enable LCD support (for output to LCD
798c609719bSwdenk		display); also select one of the supported displays
799c609719bSwdenk		by defining one of these:
800c609719bSwdenk
801c609719bSwdenk		CONFIG_NEC_NL6648AC33:
802c609719bSwdenk
803c609719bSwdenk			NEC NL6648AC33-18. Active, color, single scan.
804c609719bSwdenk
805c609719bSwdenk		CONFIG_NEC_NL6648BC20
806c609719bSwdenk
807c609719bSwdenk			NEC NL6648BC20-08. 6.5", 640x480.
808c609719bSwdenk			Active, color, single scan.
809c609719bSwdenk
810c609719bSwdenk		CONFIG_SHARP_16x9
811c609719bSwdenk
812c609719bSwdenk			Sharp 320x240. Active, color, single scan.
813c609719bSwdenk			It isn't 16x9, and I am not sure what it is.
814c609719bSwdenk
815c609719bSwdenk		CONFIG_SHARP_LQ64D341
816c609719bSwdenk
817c609719bSwdenk			Sharp LQ64D341 display, 640x480.
818c609719bSwdenk			Active, color, single scan.
819c609719bSwdenk
820c609719bSwdenk		CONFIG_HLD1045
821c609719bSwdenk
822c609719bSwdenk			HLD1045 display, 640x480.
823c609719bSwdenk			Active, color, single scan.
824c609719bSwdenk
825c609719bSwdenk		CONFIG_OPTREX_BW
826c609719bSwdenk
827c609719bSwdenk			Optrex	 CBL50840-2 NF-FW 99 22 M5
828c609719bSwdenk			or
829c609719bSwdenk			Hitachi	 LMG6912RPFC-00T
830c609719bSwdenk			or
831c609719bSwdenk			Hitachi	 SP14Q002
832c609719bSwdenk
833c609719bSwdenk			320x240. Black & white.
834c609719bSwdenk
835c609719bSwdenk		Normally display is black on white background; define
836c609719bSwdenk		CFG_WHITE_ON_BLACK to get it inverted.
837c609719bSwdenk
838d791b1dcSwdenk- Spash Screen Support: CONFIG_SPLASH_SCREEN
839d791b1dcSwdenk
840d791b1dcSwdenk		If this option is set, the environment is checked for
841d791b1dcSwdenk		a variable "splashimage". If found, the usual display
842d791b1dcSwdenk		of logo, copyright and system information on the LCD
843d791b1dcSwdenk		is supressed and the BMP image at the address
844d791b1dcSwdenk		specified in "splashimage" is loaded instead. The
845d791b1dcSwdenk		console is redirected to the "nulldev", too. This
846d791b1dcSwdenk		allows for a "silent" boot where a splash screen is
847d791b1dcSwdenk		loaded very quickly after power-on.
848d791b1dcSwdenk
849d791b1dcSwdenk
850c609719bSwdenk- Ethernet address:
851c609719bSwdenk		CONFIG_ETHADDR
852c609719bSwdenk		CONFIG_ETH2ADDR
853c609719bSwdenk		CONFIG_ETH3ADDR
854c609719bSwdenk
855c609719bSwdenk		Define a default value for ethernet address to use
856c609719bSwdenk		for the respective ethernet interface, in case this
857c609719bSwdenk		is not determined automatically.
858c609719bSwdenk
859c609719bSwdenk- IP address:
860c609719bSwdenk		CONFIG_IPADDR
861c609719bSwdenk
862c609719bSwdenk		Define a default value for the IP address to use for
863c609719bSwdenk		the default ethernet interface, in case this is not
864c609719bSwdenk		determined through e.g. bootp.
865c609719bSwdenk
866c609719bSwdenk- Server IP address:
867c609719bSwdenk		CONFIG_SERVERIP
868c609719bSwdenk
869c609719bSwdenk		Defines a default value for theIP address of a TFTP
870c609719bSwdenk		server to contact when using the "tftboot" command.
871c609719bSwdenk
872c609719bSwdenk- BOOTP Recovery Mode:
873c609719bSwdenk		CONFIG_BOOTP_RANDOM_DELAY
874c609719bSwdenk
875c609719bSwdenk		If you have many targets in a network that try to
876c609719bSwdenk		boot using BOOTP, you may want to avoid that all
877c609719bSwdenk		systems send out BOOTP requests at precisely the same
878c609719bSwdenk		moment (which would happen for instance at recovery
879c609719bSwdenk		from a power failure, when all systems will try to
880c609719bSwdenk		boot, thus flooding the BOOTP server. Defining
881c609719bSwdenk		CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be
882c609719bSwdenk		inserted before sending out BOOTP requests. The
883c609719bSwdenk		following delays are insterted then:
884c609719bSwdenk
885c609719bSwdenk		1st BOOTP request:	delay 0 ... 1 sec
886c609719bSwdenk		2nd BOOTP request:	delay 0 ... 2 sec
887c609719bSwdenk		3rd BOOTP request:	delay 0 ... 4 sec
888c609719bSwdenk		4th and following
889c609719bSwdenk		BOOTP requests:		delay 0 ... 8 sec
890c609719bSwdenk
891c609719bSwdenk- Status LED:	CONFIG_STATUS_LED
892c609719bSwdenk
893c609719bSwdenk		Several configurations allow to display the current
894c609719bSwdenk		status using a LED. For instance, the LED will blink
895c609719bSwdenk		fast while running U-Boot code, stop blinking as
896c609719bSwdenk		soon as a reply to a BOOTP request was received, and
897c609719bSwdenk		start blinking slow once the Linux kernel is running
898c609719bSwdenk		(supported by a status LED driver in the Linux
899c609719bSwdenk		kernel). Defining CONFIG_STATUS_LED enables this
900c609719bSwdenk		feature in U-Boot.
901c609719bSwdenk
902c609719bSwdenk- CAN Support:	CONFIG_CAN_DRIVER
903c609719bSwdenk
904c609719bSwdenk		Defining CONFIG_CAN_DRIVER enables CAN driver support
905c609719bSwdenk		on those systems that support this (optional)
906c609719bSwdenk		feature, like the TQM8xxL modules.
907c609719bSwdenk
908c609719bSwdenk- I2C Support:	CONFIG_HARD_I2C | CONFIG_SOFT_I2C
909c609719bSwdenk
910b37c7e5eSwdenk		These enable I2C serial bus commands. Defining either of
911b37c7e5eSwdenk		(but not both of) CONFIG_HARD_I2C or CONFIG_SOFT_I2C will
912b37c7e5eSwdenk		include the appropriate I2C driver for the selected cpu.
913c609719bSwdenk
914b37c7e5eSwdenk		This will allow you to use i2c commands at the u-boot
915b37c7e5eSwdenk		command line (as long as you set CFG_CMD_I2C in
916b37c7e5eSwdenk		CONFIG_COMMANDS) and communicate with i2c based realtime
917b37c7e5eSwdenk		clock chips. See common/cmd_i2c.c for a description of the
918c609719bSwdenk		command line interface.
919c609719bSwdenk
920b37c7e5eSwdenk		CONFIG_HARD_I2C	selects the CPM hardware driver for I2C.
921c609719bSwdenk
922b37c7e5eSwdenk		CONFIG_SOFT_I2C configures u-boot to use a software (aka
923b37c7e5eSwdenk		bit-banging) driver instead of CPM or similar hardware
924b37c7e5eSwdenk		support for I2C.
925c609719bSwdenk
926b37c7e5eSwdenk		There are several other quantities that must also be
927b37c7e5eSwdenk		defined when you define CONFIG_HARD_I2C or CONFIG_SOFT_I2C.
928c609719bSwdenk
929b37c7e5eSwdenk		In both cases you will need to define CFG_I2C_SPEED
930b37c7e5eSwdenk		to be the frequency (in Hz) at which you wish your i2c bus
931b37c7e5eSwdenk		to run and CFG_I2C_SLAVE to be the address of this node (ie
932b37c7e5eSwdenk		the cpu's i2c node address).
933c609719bSwdenk
934b37c7e5eSwdenk		Now, the u-boot i2c code for the mpc8xx (cpu/mpc8xx/i2c.c)
935b37c7e5eSwdenk		sets the cpu up as a master node and so its address should
936b37c7e5eSwdenk		therefore be cleared to 0 (See, eg, MPC823e User's Manual
937b37c7e5eSwdenk		p.16-473). So, set CFG_I2C_SLAVE to 0.
938b37c7e5eSwdenk
939b37c7e5eSwdenk		That's all that's required for CONFIG_HARD_I2C.
940b37c7e5eSwdenk
941b37c7e5eSwdenk		If you use the software i2c interface (CONFIG_SOFT_I2C)
942b37c7e5eSwdenk		then the following macros need to be defined (examples are
943b37c7e5eSwdenk		from include/configs/lwmon.h):
944c609719bSwdenk
945c609719bSwdenk		I2C_INIT
946c609719bSwdenk
947b37c7e5eSwdenk		(Optional). Any commands necessary to enable the I2C
948c609719bSwdenk		controller or configure ports.
949c609719bSwdenk
950b37c7e5eSwdenk		eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |=  PB_SCL)
951b37c7e5eSwdenk
952c609719bSwdenk		I2C_PORT
953c609719bSwdenk
954c609719bSwdenk		(Only for MPC8260 CPU). The I/O port to use (the code
955c609719bSwdenk		assumes both bits are on the same port). Valid values
956c609719bSwdenk		are 0..3 for ports A..D.
957c609719bSwdenk
958c609719bSwdenk		I2C_ACTIVE
959c609719bSwdenk
960c609719bSwdenk		The code necessary to make the I2C data line active
961c609719bSwdenk		(driven).  If the data line is open collector, this
962c609719bSwdenk		define can be null.
963c609719bSwdenk
964b37c7e5eSwdenk		eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |=  PB_SDA)
965b37c7e5eSwdenk
966c609719bSwdenk		I2C_TRISTATE
967c609719bSwdenk
968c609719bSwdenk		The code necessary to make the I2C data line tri-stated
969c609719bSwdenk		(inactive).  If the data line is open collector, this
970c609719bSwdenk		define can be null.
971c609719bSwdenk
972b37c7e5eSwdenk		eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA)
973b37c7e5eSwdenk
974c609719bSwdenk		I2C_READ
975c609719bSwdenk
976c609719bSwdenk		Code that returns TRUE if the I2C data line is high,
977c609719bSwdenk		FALSE if it is low.
978c609719bSwdenk
979b37c7e5eSwdenk		eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0)
980b37c7e5eSwdenk
981c609719bSwdenk		I2C_SDA(bit)
982c609719bSwdenk
983c609719bSwdenk		If <bit> is TRUE, sets the I2C data line high. If it
984c609719bSwdenk		is FALSE, it clears it (low).
985c609719bSwdenk
986b37c7e5eSwdenk		eg: #define I2C_SDA(bit) \
987b37c7e5eSwdenk		         if(bit) immr->im_cpm.cp_pbdat |=  PB_SDA; \
988b37c7e5eSwdenk		         else    immr->im_cpm.cp_pbdat &= ~PB_SDA
989b37c7e5eSwdenk
990c609719bSwdenk		I2C_SCL(bit)
991c609719bSwdenk
992c609719bSwdenk		If <bit> is TRUE, sets the I2C clock line high. If it
993c609719bSwdenk		is FALSE, it clears it (low).
994c609719bSwdenk
995b37c7e5eSwdenk		eg: #define I2C_SCL(bit) \
996b37c7e5eSwdenk		         if(bit) immr->im_cpm.cp_pbdat |=  PB_SCL; \
997b37c7e5eSwdenk		         else    immr->im_cpm.cp_pbdat &= ~PB_SCL
998b37c7e5eSwdenk
999c609719bSwdenk		I2C_DELAY
1000c609719bSwdenk
1001c609719bSwdenk		This delay is invoked four times per clock cycle so this
1002c609719bSwdenk		controls the rate of data transfer.  The data rate thus
1003b37c7e5eSwdenk		is 1 / (I2C_DELAY * 4). Often defined to be something
1004b37c7e5eSwdenk		like:
1005b37c7e5eSwdenk
1006b37c7e5eSwdenk		#define I2C_DELAY  udelay(2)
1007c609719bSwdenk
100847cd00faSwdenk		CFG_I2C_INIT_BOARD
100947cd00faSwdenk
101047cd00faSwdenk		When a board is reset during an i2c bus transfer
101147cd00faSwdenk		chips might think that the current transfer is still
101247cd00faSwdenk		in progress. On some boards it is possible to access
101347cd00faSwdenk		the i2c SCLK line directly, either by using the
101447cd00faSwdenk		processor pin as a GPIO or by having a second pin
101547cd00faSwdenk		connected to the bus. If this option is defined a
101647cd00faSwdenk		custom i2c_init_board() routine in boards/xxx/board.c
101747cd00faSwdenk		is run early in the boot sequence.
101847cd00faSwdenk
1019c609719bSwdenk- SPI Support:	CONFIG_SPI
1020c609719bSwdenk
1021c609719bSwdenk		Enables SPI driver (so far only tested with
1022c609719bSwdenk		SPI EEPROM, also an instance works with Crystal A/D and
1023c609719bSwdenk		D/As on the SACSng board)
1024c609719bSwdenk
1025c609719bSwdenk		CONFIG_SPI_X
1026c609719bSwdenk
1027c609719bSwdenk		Enables extended (16-bit) SPI EEPROM addressing.
1028c609719bSwdenk		(symmetrical to CONFIG_I2C_X)
1029c609719bSwdenk
1030c609719bSwdenk		CONFIG_SOFT_SPI
1031c609719bSwdenk
1032c609719bSwdenk		Enables a software (bit-bang) SPI driver rather than
1033c609719bSwdenk		using hardware support. This is a general purpose
1034c609719bSwdenk		driver that only requires three general I/O port pins
1035c609719bSwdenk		(two outputs, one input) to function. If this is
1036c609719bSwdenk		defined, the board configuration must define several
1037c609719bSwdenk		SPI configuration items (port pins to use, etc). For
1038c609719bSwdenk		an example, see include/configs/sacsng.h.
1039c609719bSwdenk
1040c609719bSwdenk- FPGA Support: CONFIG_FPGA_COUNT
1041c609719bSwdenk
1042c609719bSwdenk		Specify the number of FPGA devices to support.
1043c609719bSwdenk
1044c609719bSwdenk		CONFIG_FPGA
1045c609719bSwdenk
1046c609719bSwdenk		Used to specify the types of FPGA devices. For
1047c609719bSwdenk		example,
1048c609719bSwdenk		#define CONFIG_FPGA  CFG_XILINX_VIRTEX2
1049c609719bSwdenk
1050c609719bSwdenk		CFG_FPGA_PROG_FEEDBACK
1051c609719bSwdenk
1052c609719bSwdenk		Enable printing of hash marks during FPGA
1053c609719bSwdenk		configuration.
1054c609719bSwdenk
1055c609719bSwdenk		CFG_FPGA_CHECK_BUSY
1056c609719bSwdenk
1057c609719bSwdenk		Enable checks on FPGA configuration interface busy
1058c609719bSwdenk		status by the configuration function. This option
1059c609719bSwdenk		will require a board or device specific function to
1060c609719bSwdenk		be written.
1061c609719bSwdenk
1062c609719bSwdenk		CONFIG_FPGA_DELAY
1063c609719bSwdenk
1064c609719bSwdenk		If defined, a function that provides delays in the
1065c609719bSwdenk		FPGA configuration driver.
1066c609719bSwdenk
1067c609719bSwdenk		CFG_FPGA_CHECK_CTRLC
1068c609719bSwdenk
1069c609719bSwdenk		Allow Control-C to interrupt FPGA configuration
1070c609719bSwdenk
1071c609719bSwdenk		CFG_FPGA_CHECK_ERROR
1072c609719bSwdenk
1073c609719bSwdenk		Check for configuration errors during FPGA bitfile
1074c609719bSwdenk		loading. For example, abort during Virtex II
1075c609719bSwdenk		configuration if the INIT_B line goes low (which
1076c609719bSwdenk		indicated a CRC error).
1077c609719bSwdenk
1078c609719bSwdenk		CFG_FPGA_WAIT_INIT
1079c609719bSwdenk
1080c609719bSwdenk		Maximum time to wait for the INIT_B line to deassert
1081c609719bSwdenk		after PROB_B has been deasserted during a Virtex II
1082c609719bSwdenk		FPGA configuration sequence. The default time is 500 mS.
1083c609719bSwdenk
1084c609719bSwdenk		CFG_FPGA_WAIT_BUSY
1085c609719bSwdenk
1086c609719bSwdenk		Maximum time to wait for BUSY to deassert during
1087c609719bSwdenk		Virtex II FPGA configuration. The default is 5 mS.
1088c609719bSwdenk
1089c609719bSwdenk		CFG_FPGA_WAIT_CONFIG
1090c609719bSwdenk
1091c609719bSwdenk		Time to wait after FPGA configuration. The default is
1092c609719bSwdenk		200 mS.
1093c609719bSwdenk
1094c609719bSwdenk- FPGA Support:	CONFIG_FPGA_COUNT
1095c609719bSwdenk
1096c609719bSwdenk		Specify the number of FPGA devices to support.
1097c609719bSwdenk
1098c609719bSwdenk		CONFIG_FPGA
1099c609719bSwdenk
1100c609719bSwdenk		Used to specify the types of FPGA devices.  For example,
1101c609719bSwdenk		#define CONFIG_FPGA  CFG_XILINX_VIRTEX2
1102c609719bSwdenk
1103c609719bSwdenk		CFG_FPGA_PROG_FEEDBACK
1104c609719bSwdenk
1105c609719bSwdenk		Enable printing of hash marks during FPGA configuration.
1106c609719bSwdenk
1107c609719bSwdenk		CFG_FPGA_CHECK_BUSY
1108c609719bSwdenk
1109c609719bSwdenk		Enable checks on FPGA configuration interface busy
1110c609719bSwdenk		status by the configuration function. This option
1111c609719bSwdenk		will require a board or device specific function to
1112c609719bSwdenk		be written.
1113c609719bSwdenk
1114c609719bSwdenk		CONFIG_FPGA_DELAY
1115c609719bSwdenk
1116c609719bSwdenk		If defined, a function that provides delays in the FPGA
1117c609719bSwdenk		configuration driver.
1118c609719bSwdenk
1119c609719bSwdenk		CFG_FPGA_CHECK_CTRLC
1120c609719bSwdenk		Allow Control-C to interrupt FPGA configuration
1121c609719bSwdenk
1122c609719bSwdenk		CFG_FPGA_CHECK_ERROR
1123c609719bSwdenk
1124c609719bSwdenk		Check for configuration errors during FPGA bitfile
1125c609719bSwdenk		loading. For example, abort during Virtex II
1126c609719bSwdenk		configuration if the INIT_B line goes low (which
1127c609719bSwdenk		indicated a CRC error).
1128c609719bSwdenk
1129c609719bSwdenk		CFG_FPGA_WAIT_INIT
1130c609719bSwdenk
1131c609719bSwdenk		Maximum time to wait for the INIT_B line to deassert
1132c609719bSwdenk		after PROB_B has been deasserted during a Virtex II
1133c609719bSwdenk		FPGA configuration sequence. The default time is 500
1134c609719bSwdenk		mS.
1135c609719bSwdenk
1136c609719bSwdenk		CFG_FPGA_WAIT_BUSY
1137c609719bSwdenk
1138c609719bSwdenk		Maximum time to wait for BUSY to deassert during
1139c609719bSwdenk		Virtex II FPGA configuration. The default is 5 mS.
1140c609719bSwdenk
1141c609719bSwdenk		CFG_FPGA_WAIT_CONFIG
1142c609719bSwdenk
1143c609719bSwdenk		Time to wait after FPGA configuration. The default is
1144c609719bSwdenk		200 mS.
1145c609719bSwdenk
1146c609719bSwdenk- Configuration Management:
1147c609719bSwdenk		CONFIG_IDENT_STRING
1148c609719bSwdenk
1149c609719bSwdenk		If defined, this string will be added to the U-Boot
1150c609719bSwdenk		version information (U_BOOT_VERSION)
1151c609719bSwdenk
1152c609719bSwdenk- Vendor Parameter Protection:
1153c609719bSwdenk
1154c609719bSwdenk		U-Boot considers the values of the environment
1155c609719bSwdenk		variables "serial#" (Board Serial Number) and
1156c609719bSwdenk		"ethaddr" (Ethernet Address) to bb parameters that
1157c609719bSwdenk		are set once by the board vendor / manufacturer, and
1158c609719bSwdenk		protects these variables from casual modification by
1159c609719bSwdenk		the user. Once set, these variables are read-only,
1160c609719bSwdenk		and write or delete attempts are rejected. You can
1161c609719bSwdenk		change this behviour:
1162c609719bSwdenk
1163c609719bSwdenk		If CONFIG_ENV_OVERWRITE is #defined in your config
1164c609719bSwdenk		file, the write protection for vendor parameters is
116547cd00faSwdenk		completely disabled. Anybody can change or delete
1166c609719bSwdenk		these parameters.
1167c609719bSwdenk
1168c609719bSwdenk		Alternatively, if you #define _both_ CONFIG_ETHADDR
1169c609719bSwdenk		_and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default
1170c609719bSwdenk		ethernet address is installed in the environment,
1171c609719bSwdenk		which can be changed exactly ONCE by the user. [The
1172c609719bSwdenk		serial# is unaffected by this, i. e. it remains
1173c609719bSwdenk		read-only.]
1174c609719bSwdenk
1175c609719bSwdenk- Protected RAM:
1176c609719bSwdenk		CONFIG_PRAM
1177c609719bSwdenk
1178c609719bSwdenk		Define this variable to enable the reservation of
1179c609719bSwdenk		"protected RAM", i. e. RAM which is not overwritten
1180c609719bSwdenk		by U-Boot. Define CONFIG_PRAM to hold the number of
1181c609719bSwdenk		kB you want to reserve for pRAM. You can overwrite
1182c609719bSwdenk		this default value by defining an environment
1183c609719bSwdenk		variable "pram" to the number of kB you want to
1184c609719bSwdenk		reserve. Note that the board info structure will
1185c609719bSwdenk		still show the full amount of RAM. If pRAM is
1186c609719bSwdenk		reserved, a new environment variable "mem" will
1187c609719bSwdenk		automatically be defined to hold the amount of
1188c609719bSwdenk		remaining RAM in a form that can be passed as boot
1189c609719bSwdenk		argument to Linux, for instance like that:
1190c609719bSwdenk
1191c609719bSwdenk			setenv bootargs ... mem=\$(mem)
1192c609719bSwdenk			saveenv
1193c609719bSwdenk
1194c609719bSwdenk		This way you can tell Linux not to use this memory,
1195c609719bSwdenk		either, which results in a memory region that will
1196c609719bSwdenk		not be affected by reboots.
1197c609719bSwdenk
1198c609719bSwdenk		*WARNING* If your board configuration uses automatic
1199c609719bSwdenk		detection of the RAM size, you must make sure that
1200c609719bSwdenk		this memory test is non-destructive. So far, the
1201c609719bSwdenk		following board configurations are known to be
1202c609719bSwdenk		"pRAM-clean":
1203c609719bSwdenk
1204c609719bSwdenk			ETX094, IVMS8, IVML24, SPD8xx, TQM8xxL,
1205c609719bSwdenk			HERMES, IP860, RPXlite, LWMON, LANTEC,
1206c609719bSwdenk			PCU_E, FLAGADM, TQM8260
1207c609719bSwdenk
1208c609719bSwdenk- Error Recovery:
1209c609719bSwdenk		CONFIG_PANIC_HANG
1210c609719bSwdenk
1211c609719bSwdenk		Define this variable to stop the system in case of a
1212c609719bSwdenk		fatal error, so that you have to reset it manually.
1213c609719bSwdenk		This is probably NOT a good idea for an embedded
1214c609719bSwdenk		system where you want to system to reboot
1215c609719bSwdenk		automatically as fast as possible, but it may be
1216c609719bSwdenk		useful during development since you can try to debug
1217c609719bSwdenk		the conditions that lead to the situation.
1218c609719bSwdenk
1219c609719bSwdenk		CONFIG_NET_RETRY_COUNT
1220c609719bSwdenk
1221c609719bSwdenk		This variable defines the number of retries for
1222c609719bSwdenk		network operations like ARP, RARP, TFTP, or BOOTP
1223c609719bSwdenk		before giving up the operation. If not defined, a
1224c609719bSwdenk		default value of 5 is used.
1225c609719bSwdenk
1226c609719bSwdenk- Command Interpreter:
1227c609719bSwdenk		CFG_HUSH_PARSER
1228c609719bSwdenk
1229c609719bSwdenk		Define this variable to enable the "hush" shell (from
1230c609719bSwdenk		Busybox) as command line interpreter, thus enabling
1231c609719bSwdenk		powerful command line syntax like
1232c609719bSwdenk		if...then...else...fi conditionals or `&&' and '||'
1233c609719bSwdenk		constructs ("shell scripts").
1234c609719bSwdenk
1235c609719bSwdenk		If undefined, you get the old, much simpler behaviour
1236c609719bSwdenk		with a somewhat smaller memory footprint.
1237c609719bSwdenk
1238c609719bSwdenk
1239c609719bSwdenk		CFG_PROMPT_HUSH_PS2
1240c609719bSwdenk
1241c609719bSwdenk		This defines the secondary prompt string, which is
1242c609719bSwdenk		printed when the command interpreter needs more input
1243c609719bSwdenk		to complete a command. Usually "> ".
1244c609719bSwdenk
1245c609719bSwdenk	Note:
1246c609719bSwdenk
1247c609719bSwdenk		In the current implementation, the local variables
1248c609719bSwdenk		space and global environment variables space are
1249c609719bSwdenk		separated. Local variables are those you define by
12503b57fe0aSwdenk		simply typing `name=value'. To access a local
1251c609719bSwdenk		variable later on, you have write `$name' or
12523b57fe0aSwdenk		`${name}'; to execute the contents of a variable
12533b57fe0aSwdenk		directly type `$name' at the command prompt.
1254c609719bSwdenk
1255c609719bSwdenk		Global environment variables are those you use
1256c609719bSwdenk		setenv/printenv to work with. To run a command stored
1257c609719bSwdenk		in such a variable, you need to use the run command,
1258c609719bSwdenk		and you must not use the '$' sign to access them.
1259c609719bSwdenk
1260c609719bSwdenk		To store commands and special characters in a
1261c609719bSwdenk		variable, please use double quotation marks
1262c609719bSwdenk		surrounding the whole text of the variable, instead
1263c609719bSwdenk		of the backslashes before semicolons and special
1264c609719bSwdenk		symbols.
1265c609719bSwdenk
1266c609719bSwdenk- Default Environment
1267c609719bSwdenk		CONFIG_EXTRA_ENV_SETTINGS
1268c609719bSwdenk
1269c609719bSwdenk		Define this to contain any number of null terminated
1270c609719bSwdenk		strings (variable = value pairs) that will be part of
1271c609719bSwdenk		the default enviroment compiled into the boot image.
12722262cfeeSwdenk
1273c609719bSwdenk		For example, place something like this in your
1274c609719bSwdenk		board's config file:
1275c609719bSwdenk
1276c609719bSwdenk		#define CONFIG_EXTRA_ENV_SETTINGS \
1277c609719bSwdenk			"myvar1=value1\0" \
1278c609719bSwdenk			"myvar2=value2\0"
1279c609719bSwdenk
1280c609719bSwdenk		Warning: This method is based on knowledge about the
1281c609719bSwdenk		internal format how the environment is stored by the
12822262cfeeSwdenk		U-Boot code. This is NOT an official, exported
1283c609719bSwdenk		interface! Although it is unlikely that this format
12842262cfeeSwdenk		will change soon, but there is no guarantee either.
1285c609719bSwdenk		You better know what you are doing here.
1286c609719bSwdenk
1287c609719bSwdenk		Note: overly (ab)use of the default environment is
1288c609719bSwdenk		discouraged. Make sure to check other ways to preset
1289c609719bSwdenk		the environment like the autoscript function or the
1290c609719bSwdenk		boot command first.
1291c609719bSwdenk
12922abbe075Swdenk- DataFlash Support
12932abbe075Swdenk		CONFIG_HAS_DATAFLASH
12942abbe075Swdenk
12952abbe075Swdenk		Defining this option enables DataFlash features and
12962abbe075Swdenk		allows to read/write in Dataflash via the standard
12972abbe075Swdenk		commands cp, md...
12982abbe075Swdenk
1299c609719bSwdenk- Show boot progress
1300c609719bSwdenk		CONFIG_SHOW_BOOT_PROGRESS
1301c609719bSwdenk
1302c609719bSwdenk		Defining this option allows to add some board-
1303c609719bSwdenk		specific code (calling a user-provided function
1304c609719bSwdenk		"show_boot_progress(int)") that enables you to show
1305c609719bSwdenk		the system's boot progress on some display (for
1306c609719bSwdenk		example, some LED's) on your board. At the moment,
1307c609719bSwdenk		the following checkpoints are implemented:
1308c609719bSwdenk
1309c609719bSwdenk  Arg	Where			When
1310c609719bSwdenk    1	common/cmd_bootm.c	before attempting to boot an image
1311c609719bSwdenk   -1	common/cmd_bootm.c	Image header has bad     magic number
1312c609719bSwdenk    2	common/cmd_bootm.c	Image header has correct magic number
1313c609719bSwdenk   -2	common/cmd_bootm.c	Image header has bad     checksum
1314c609719bSwdenk    3	common/cmd_bootm.c	Image header has correct checksum
1315c609719bSwdenk   -3	common/cmd_bootm.c	Image data   has bad     checksum
1316c609719bSwdenk    4	common/cmd_bootm.c	Image data   has correct checksum
1317c609719bSwdenk   -4	common/cmd_bootm.c	Image is for unsupported architecture
1318c609719bSwdenk    5	common/cmd_bootm.c	Architecture check OK
1319c609719bSwdenk   -5	common/cmd_bootm.c	Wrong Image Type (not kernel, multi, standalone)
1320c609719bSwdenk    6	common/cmd_bootm.c	Image Type check OK
1321c609719bSwdenk   -6	common/cmd_bootm.c	gunzip uncompression error
1322c609719bSwdenk   -7	common/cmd_bootm.c	Unimplemented compression type
1323c609719bSwdenk    7	common/cmd_bootm.c	Uncompression OK
1324c609719bSwdenk   -8	common/cmd_bootm.c	Wrong Image Type (not kernel, multi, standalone)
1325c609719bSwdenk    8	common/cmd_bootm.c	Image Type check OK
1326c609719bSwdenk   -9	common/cmd_bootm.c	Unsupported OS (not Linux, BSD, VxWorks, QNX)
1327c609719bSwdenk    9	common/cmd_bootm.c	Start initial ramdisk verification
1328c609719bSwdenk  -10	common/cmd_bootm.c	Ramdisk header has bad     magic number
1329c609719bSwdenk  -11	common/cmd_bootm.c	Ramdisk header has bad     checksum
1330c609719bSwdenk   10	common/cmd_bootm.c	Ramdisk header is OK
1331c609719bSwdenk  -12	common/cmd_bootm.c	Ramdisk data   has bad     checksum
1332c609719bSwdenk   11	common/cmd_bootm.c	Ramdisk data   has correct checksum
1333c609719bSwdenk   12	common/cmd_bootm.c	Ramdisk verification complete, start loading
1334c609719bSwdenk  -13	common/cmd_bootm.c	Wrong Image Type (not PPC Linux Ramdisk)
1335c609719bSwdenk   13	common/cmd_bootm.c	Start multifile image verification
1336c609719bSwdenk   14	common/cmd_bootm.c	No initial ramdisk, no multifile, continue.
1337c609719bSwdenk   15	common/cmd_bootm.c	All preparation done, transferring control to OS
1338c609719bSwdenk
1339c609719bSwdenk   -1	common/cmd_doc.c	Bad usage of "doc" command
1340c609719bSwdenk   -1	common/cmd_doc.c	No boot device
1341c609719bSwdenk   -1	common/cmd_doc.c	Unknown Chip ID on boot device
1342c609719bSwdenk   -1	common/cmd_doc.c	Read Error on boot device
1343c609719bSwdenk   -1	common/cmd_doc.c	Image header has bad magic number
1344c609719bSwdenk
1345c609719bSwdenk   -1	common/cmd_ide.c	Bad usage of "ide" command
1346c609719bSwdenk   -1	common/cmd_ide.c	No boot device
1347c609719bSwdenk   -1	common/cmd_ide.c	Unknown boot device
1348c609719bSwdenk   -1	common/cmd_ide.c	Unknown partition table
1349c609719bSwdenk   -1	common/cmd_ide.c	Invalid partition type
1350c609719bSwdenk   -1	common/cmd_ide.c	Read Error on boot device
1351c609719bSwdenk   -1	common/cmd_ide.c	Image header has bad magic number
1352c609719bSwdenk
1353c609719bSwdenk   -1	common/cmd_nvedit.c	Environment not changable, but has bad CRC
1354c609719bSwdenk
1355c609719bSwdenk
1356c609719bSwdenkModem Support:
1357c609719bSwdenk--------------
1358c609719bSwdenk
135985ec0bccSwdenk[so far only for SMDK2400 and TRAB boards]
1360c609719bSwdenk
1361c609719bSwdenk- Modem support endable:
1362c609719bSwdenk		CONFIG_MODEM_SUPPORT
1363c609719bSwdenk
1364c609719bSwdenk- RTS/CTS Flow control enable:
1365c609719bSwdenk		CONFIG_HWFLOW
1366c609719bSwdenk
1367c609719bSwdenk- Modem debug support:
1368c609719bSwdenk		CONFIG_MODEM_SUPPORT_DEBUG
1369c609719bSwdenk
1370c609719bSwdenk		Enables debugging stuff (char screen[1024], dbg())
1371c609719bSwdenk		for modem support. Useful only with BDI2000.
1372c609719bSwdenk
1373c609719bSwdenk- General:
1374c609719bSwdenk
1375c609719bSwdenk		In the target system modem support is enabled when a
1376c609719bSwdenk		specific key (key combination) is pressed during
1377c609719bSwdenk		power-on. Otherwise U-Boot will boot normally
1378c609719bSwdenk		(autoboot). The key_pressed() fuction is called from
1379c609719bSwdenk		board_init(). Currently key_pressed() is a dummy
1380c609719bSwdenk		function, returning 1 and thus enabling modem
1381c609719bSwdenk		initialization.
1382c609719bSwdenk
1383c609719bSwdenk		If there are no modem init strings in the
1384c609719bSwdenk		environment, U-Boot proceed to autoboot; the
1385c609719bSwdenk		previous output (banner, info printfs) will be
1386c609719bSwdenk		supressed, though.
1387c609719bSwdenk
1388c609719bSwdenk		See also: doc/README.Modem
1389c609719bSwdenk
1390c609719bSwdenk
1391c609719bSwdenkConfiguration Settings:
1392c609719bSwdenk-----------------------
1393c609719bSwdenk
1394c609719bSwdenk- CFG_LONGHELP: Defined when you want long help messages included;
1395c609719bSwdenk		undefine this when you're short of memory.
1396c609719bSwdenk
1397c609719bSwdenk- CFG_PROMPT:	This is what U-Boot prints on the console to
1398c609719bSwdenk		prompt for user input.
1399c609719bSwdenk
1400c609719bSwdenk- CFG_CBSIZE:	Buffer size for input from the Console
1401c609719bSwdenk
1402c609719bSwdenk- CFG_PBSIZE:	Buffer size for Console output
1403c609719bSwdenk
1404c609719bSwdenk- CFG_MAXARGS:	max. Number of arguments accepted for monitor commands
1405c609719bSwdenk
1406c609719bSwdenk- CFG_BARGSIZE: Buffer size for Boot Arguments which are passed to
1407c609719bSwdenk		the application (usually a Linux kernel) when it is
1408c609719bSwdenk		booted
1409c609719bSwdenk
1410c609719bSwdenk- CFG_BAUDRATE_TABLE:
1411c609719bSwdenk		List of legal baudrate settings for this board.
1412c609719bSwdenk
1413c609719bSwdenk- CFG_CONSOLE_INFO_QUIET
1414c609719bSwdenk		Suppress display of console information at boot.
1415c609719bSwdenk
1416c609719bSwdenk- CFG_CONSOLE_IS_IN_ENV
1417c609719bSwdenk		If the board specific function
1418c609719bSwdenk			extern int overwrite_console (void);
1419c609719bSwdenk		returns 1, the stdin, stderr and stdout are switched to the
1420c609719bSwdenk		serial port, else the settings in the environment are used.
1421c609719bSwdenk
1422c609719bSwdenk- CFG_CONSOLE_OVERWRITE_ROUTINE
1423c609719bSwdenk		Enable the call to overwrite_console().
1424c609719bSwdenk
1425c609719bSwdenk- CFG_CONSOLE_ENV_OVERWRITE
1426c609719bSwdenk		Enable overwrite of previous console environment settings.
1427c609719bSwdenk
1428c609719bSwdenk- CFG_MEMTEST_START, CFG_MEMTEST_END:
1429c609719bSwdenk		Begin and End addresses of the area used by the
1430c609719bSwdenk		simple memory test.
1431c609719bSwdenk
1432c609719bSwdenk- CFG_ALT_MEMTEST:
1433c609719bSwdenk		Enable an alternate, more extensive memory test.
1434c609719bSwdenk
1435c609719bSwdenk- CFG_TFTP_LOADADDR:
1436c609719bSwdenk		Default load address for network file downloads
1437c609719bSwdenk
1438c609719bSwdenk- CFG_LOADS_BAUD_CHANGE:
1439c609719bSwdenk		Enable temporary baudrate change while serial download
1440c609719bSwdenk
1441c609719bSwdenk- CFG_SDRAM_BASE:
1442c609719bSwdenk		Physical start address of SDRAM. _Must_ be 0 here.
1443c609719bSwdenk
1444c609719bSwdenk- CFG_MBIO_BASE:
1445c609719bSwdenk		Physical start address of Motherboard I/O (if using a
1446c609719bSwdenk		Cogent motherboard)
1447c609719bSwdenk
1448c609719bSwdenk- CFG_FLASH_BASE:
1449c609719bSwdenk		Physical start address of Flash memory.
1450c609719bSwdenk
1451c609719bSwdenk- CFG_MONITOR_BASE:
1452c609719bSwdenk		Physical start address of boot monitor code (set by
1453c609719bSwdenk		make config files to be same as the text base address
1454c609719bSwdenk		(TEXT_BASE) used when linking) - same as
1455c609719bSwdenk		CFG_FLASH_BASE when booting from flash.
1456c609719bSwdenk
1457c609719bSwdenk- CFG_MONITOR_LEN:
14583b57fe0aSwdenk		Size of memory reserved for monitor code, used to
14593b57fe0aSwdenk		determine _at_compile_time_ (!) if the environment is
14603b57fe0aSwdenk		embedded within the U-Boot image, or in a separate
14613b57fe0aSwdenk		flash sector.
1462c609719bSwdenk
1463c609719bSwdenk- CFG_MALLOC_LEN:
1464c609719bSwdenk		Size of DRAM reserved for malloc() use.
1465c609719bSwdenk
1466c609719bSwdenk- CFG_BOOTMAPSZ:
1467c609719bSwdenk		Maximum size of memory mapped by the startup code of
1468c609719bSwdenk		the Linux kernel; all data that must be processed by
1469c609719bSwdenk		the Linux kernel (bd_info, boot arguments, eventually
1470c609719bSwdenk		initrd image) must be put below this limit.
1471c609719bSwdenk
1472c609719bSwdenk- CFG_MAX_FLASH_BANKS:
1473c609719bSwdenk		Max number of Flash memory banks
1474c609719bSwdenk
1475c609719bSwdenk- CFG_MAX_FLASH_SECT:
1476c609719bSwdenk		Max number of sectors on a Flash chip
1477c609719bSwdenk
1478c609719bSwdenk- CFG_FLASH_ERASE_TOUT:
1479c609719bSwdenk		Timeout for Flash erase operations (in ms)
1480c609719bSwdenk
1481c609719bSwdenk- CFG_FLASH_WRITE_TOUT:
1482c609719bSwdenk		Timeout for Flash write operations (in ms)
1483c609719bSwdenk
1484*8564acf9Swdenk- CFG_FLASH_LOCK_TOUT
1485*8564acf9Swdenk		Timeout for Flash set sector lock bit operation (in ms)
1486*8564acf9Swdenk
1487*8564acf9Swdenk- CFG_FLASH_UNLOCK_TOUT
1488*8564acf9Swdenk		Timeout for Flash clear lock bits operation (in ms)
1489*8564acf9Swdenk
1490*8564acf9Swdenk- CFG_FLASH_PROTECTION
1491*8564acf9Swdenk		If defined, hardware flash sectors protection is used
1492*8564acf9Swdenk		instead of U-Boot software protection.
1493*8564acf9Swdenk
1494c609719bSwdenk- CFG_DIRECT_FLASH_TFTP:
1495c609719bSwdenk
1496c609719bSwdenk		Enable TFTP transfers directly to flash memory;
1497c609719bSwdenk		without this option such a download has to be
1498c609719bSwdenk		performed in two steps: (1) download to RAM, and (2)
1499c609719bSwdenk		copy from RAM to flash.
1500c609719bSwdenk
1501c609719bSwdenk		The two-step approach is usually more reliable, since
1502c609719bSwdenk		you can check if the download worked before you erase
1503c609719bSwdenk		the flash, but in some situations (when sytem RAM is
1504c609719bSwdenk		too limited to allow for a tempory copy of the
1505c609719bSwdenk		downloaded image) this option may be very useful.
1506c609719bSwdenk
1507c609719bSwdenk- CFG_FLASH_CFI:
1508c609719bSwdenk		Define if the flash driver uses extra elements in the
1509c609719bSwdenk		common flash structure for storing flash geometry
151053cf9435Sstroese
151153cf9435Sstroese- CFG_RX_ETH_BUFFER:
151253cf9435Sstroese		Defines the number of ethernet receive buffers. On some
151353cf9435Sstroese		ethernet controllers it is recommended to set this value
151453cf9435Sstroese		to 8 or even higher (EEPRO100 or 405 EMAC), since all
151553cf9435Sstroese		buffers can be full shortly after enabling the interface
151653cf9435Sstroese		on high ethernet traffic.
151753cf9435Sstroese		Defaults to 4 if not defined.
1518c609719bSwdenk
1519c609719bSwdenkThe following definitions that deal with the placement and management
1520c609719bSwdenkof environment data (variable area); in general, we support the
1521c609719bSwdenkfollowing configurations:
1522c609719bSwdenk
1523c609719bSwdenk- CFG_ENV_IS_IN_FLASH:
1524c609719bSwdenk
1525c609719bSwdenk	Define this if the environment is in flash memory.
1526c609719bSwdenk
1527c609719bSwdenk	a) The environment occupies one whole flash sector, which is
1528c609719bSwdenk	   "embedded" in the text segment with the U-Boot code. This
1529c609719bSwdenk	   happens usually with "bottom boot sector" or "top boot
1530c609719bSwdenk	   sector" type flash chips, which have several smaller
1531c609719bSwdenk	   sectors at the start or the end. For instance, such a
1532c609719bSwdenk	   layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In
1533c609719bSwdenk	   such a case you would place the environment in one of the
1534c609719bSwdenk	   4 kB sectors - with U-Boot code before and after it. With
1535c609719bSwdenk	   "top boot sector" type flash chips, you would put the
1536c609719bSwdenk	   environment in one of the last sectors, leaving a gap
1537c609719bSwdenk	   between U-Boot and the environment.
1538c609719bSwdenk
1539c609719bSwdenk	- CFG_ENV_OFFSET:
1540c609719bSwdenk
1541c609719bSwdenk	   Offset of environment data (variable area) to the
1542c609719bSwdenk	   beginning of flash memory; for instance, with bottom boot
1543c609719bSwdenk	   type flash chips the second sector can be used: the offset
1544c609719bSwdenk	   for this sector is given here.
1545c609719bSwdenk
1546c609719bSwdenk	   CFG_ENV_OFFSET is used relative to CFG_FLASH_BASE.
1547c609719bSwdenk
1548c609719bSwdenk	- CFG_ENV_ADDR:
1549c609719bSwdenk
1550c609719bSwdenk	   This is just another way to specify the start address of
1551c609719bSwdenk	   the flash sector containing the environment (instead of
1552c609719bSwdenk	   CFG_ENV_OFFSET).
1553c609719bSwdenk
1554c609719bSwdenk	- CFG_ENV_SECT_SIZE:
1555c609719bSwdenk
1556c609719bSwdenk	   Size of the sector containing the environment.
1557c609719bSwdenk
1558c609719bSwdenk
1559c609719bSwdenk	b) Sometimes flash chips have few, equal sized, BIG sectors.
1560c609719bSwdenk	   In such a case you don't want to spend a whole sector for
1561c609719bSwdenk	   the environment.
1562c609719bSwdenk
1563c609719bSwdenk	- CFG_ENV_SIZE:
1564c609719bSwdenk
1565c609719bSwdenk	   If you use this in combination with CFG_ENV_IS_IN_FLASH
1566c609719bSwdenk	   and CFG_ENV_SECT_SIZE, you can specify to use only a part
1567c609719bSwdenk	   of this flash sector for the environment. This saves
1568c609719bSwdenk	   memory for the RAM copy of the environment.
1569c609719bSwdenk
1570c609719bSwdenk	   It may also save flash memory if you decide to use this
1571c609719bSwdenk	   when your environment is "embedded" within U-Boot code,
1572c609719bSwdenk	   since then the remainder of the flash sector could be used
1573c609719bSwdenk	   for U-Boot code. It should be pointed out that this is
1574c609719bSwdenk	   STRONGLY DISCOURAGED from a robustness point of view:
1575c609719bSwdenk	   updating the environment in flash makes it always
1576c609719bSwdenk	   necessary to erase the WHOLE sector. If something goes
1577c609719bSwdenk	   wrong before the contents has been restored from a copy in
1578c609719bSwdenk	   RAM, your target system will be dead.
1579c609719bSwdenk
1580c609719bSwdenk	- CFG_ENV_ADDR_REDUND
1581c609719bSwdenk	  CFG_ENV_SIZE_REDUND
1582c609719bSwdenk
1583c609719bSwdenk	   These settings describe a second storage area used to hold
1584c609719bSwdenk	   a redundand copy of the environment data, so that there is
15853e38691eSwdenk	   a valid backup copy in case there is a power failure during
1586c609719bSwdenk	   a "saveenv" operation.
1587c609719bSwdenk
1588c609719bSwdenkBE CAREFUL! Any changes to the flash layout, and some changes to the
1589c609719bSwdenksource code will make it necessary to adapt <board>/u-boot.lds*
1590c609719bSwdenkaccordingly!
1591c609719bSwdenk
1592c609719bSwdenk
1593c609719bSwdenk- CFG_ENV_IS_IN_NVRAM:
1594c609719bSwdenk
1595c609719bSwdenk	Define this if you have some non-volatile memory device
1596c609719bSwdenk	(NVRAM, battery buffered SRAM) which you want to use for the
1597c609719bSwdenk	environment.
1598c609719bSwdenk
1599c609719bSwdenk	- CFG_ENV_ADDR:
1600c609719bSwdenk	- CFG_ENV_SIZE:
1601c609719bSwdenk
1602c609719bSwdenk	  These two #defines are used to determin the memory area you
1603c609719bSwdenk	  want to use for environment. It is assumed that this memory
1604c609719bSwdenk	  can just be read and written to, without any special
1605c609719bSwdenk	  provision.
1606c609719bSwdenk
1607c609719bSwdenkBE CAREFUL! The first access to the environment happens quite early
1608c609719bSwdenkin U-Boot initalization (when we try to get the setting of for the
1609c609719bSwdenkconsole baudrate). You *MUST* have mappend your NVRAM area then, or
1610c609719bSwdenkU-Boot will hang.
1611c609719bSwdenk
1612c609719bSwdenkPlease note that even with NVRAM we still use a copy of the
1613c609719bSwdenkenvironment in RAM: we could work on NVRAM directly, but we want to
1614c609719bSwdenkkeep settings there always unmodified except somebody uses "saveenv"
1615c609719bSwdenkto save the current settings.
1616c609719bSwdenk
1617c609719bSwdenk
1618c609719bSwdenk- CFG_ENV_IS_IN_EEPROM:
1619c609719bSwdenk
1620c609719bSwdenk	Use this if you have an EEPROM or similar serial access
1621c609719bSwdenk	device and a driver for it.
1622c609719bSwdenk
1623c609719bSwdenk	- CFG_ENV_OFFSET:
1624c609719bSwdenk	- CFG_ENV_SIZE:
1625c609719bSwdenk
1626c609719bSwdenk	  These two #defines specify the offset and size of the
1627c609719bSwdenk	  environment area within the total memory of your EEPROM.
1628c609719bSwdenk
1629c609719bSwdenk	- CFG_I2C_EEPROM_ADDR:
1630c609719bSwdenk	  If defined, specified the chip address of the EEPROM device.
1631c609719bSwdenk	  The default address is zero.
1632c609719bSwdenk
1633c609719bSwdenk	- CFG_EEPROM_PAGE_WRITE_BITS:
1634c609719bSwdenk	  If defined, the number of bits used to address bytes in a
1635c609719bSwdenk	  single page in the EEPROM device.  A 64 byte page, for example
1636c609719bSwdenk	  would require six bits.
1637c609719bSwdenk
1638c609719bSwdenk	- CFG_EEPROM_PAGE_WRITE_DELAY_MS:
1639c609719bSwdenk	  If defined, the number of milliseconds to delay between
1640c609719bSwdenk	  page writes.  The default is zero milliseconds.
1641c609719bSwdenk
1642c609719bSwdenk	- CFG_I2C_EEPROM_ADDR_LEN:
1643c609719bSwdenk	  The length in bytes of the EEPROM memory array address.  Note
1644c609719bSwdenk	  that this is NOT the chip address length!
1645c609719bSwdenk
1646c609719bSwdenk	- CFG_EEPROM_SIZE:
1647c609719bSwdenk	  The size in bytes of the EEPROM device.
1648c609719bSwdenk
1649c609719bSwdenk
1650c609719bSwdenk- CFG_SPI_INIT_OFFSET
1651c609719bSwdenk
1652c609719bSwdenk	Defines offset to the initial SPI buffer area in DPRAM. The
1653c609719bSwdenk	area is used at an early stage (ROM part) if the environment
1654c609719bSwdenk	is configured to reside in the SPI EEPROM: We need a 520 byte
1655c609719bSwdenk	scratch DPRAM area. It is used between the two initialization
1656c609719bSwdenk	calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems
1657c609719bSwdenk	to be a good choice since it makes it far enough from the
1658c609719bSwdenk	start of the data area as well as from the stack pointer.
1659c609719bSwdenk
1660c609719bSwdenkPlease note that the environment is read-only as long as the monitor
1661c609719bSwdenkhas been relocated to RAM and a RAM copy of the environment has been
1662c609719bSwdenkcreated; also, when using EEPROM you will have to use getenv_r()
1663c609719bSwdenkuntil then to read environment variables.
1664c609719bSwdenk
166585ec0bccSwdenkThe environment is protected by a CRC32 checksum. Before the monitor
166685ec0bccSwdenkis relocated into RAM, as a result of a bad CRC you will be working
166785ec0bccSwdenkwith the compiled-in default environment - *silently*!!! [This is
166885ec0bccSwdenknecessary, because the first environment variable we need is the
166985ec0bccSwdenk"baudrate" setting for the console - if we have a bad CRC, we don't
167085ec0bccSwdenkhave any device yet where we could complain.]
1671c609719bSwdenk
1672c609719bSwdenkNote: once the monitor has been relocated, then it will complain if
1673c609719bSwdenkthe default environment is used; a new CRC is computed as soon as you
167485ec0bccSwdenkuse the "saveenv" command to store a valid environment.
1675c609719bSwdenk
1676c609719bSwdenk
1677c609719bSwdenkLow Level (hardware related) configuration options:
1678dc7c9a1aSwdenk---------------------------------------------------
1679c609719bSwdenk
1680c609719bSwdenk- CFG_CACHELINE_SIZE:
1681c609719bSwdenk		Cache Line Size of the CPU.
1682c609719bSwdenk
1683c609719bSwdenk- CFG_DEFAULT_IMMR:
1684c609719bSwdenk		Default address of the IMMR after system reset.
1685c609719bSwdenk		Needed on some 8260 systems (MPC8260ADS and RPXsuper)
1686c609719bSwdenk		to be able to adjust the position of the IMMR
1687c609719bSwdenk		register after a reset.
1688c609719bSwdenk
16897f6c2cbcSwdenk- Floppy Disk Support:
16907f6c2cbcSwdenk		CFG_FDC_DRIVE_NUMBER
16917f6c2cbcSwdenk
16927f6c2cbcSwdenk		the default drive number (default value 0)
16937f6c2cbcSwdenk
16947f6c2cbcSwdenk		CFG_ISA_IO_STRIDE
16957f6c2cbcSwdenk
16967f6c2cbcSwdenk		defines the spacing between fdc chipset registers
16977f6c2cbcSwdenk		(default value 1)
16987f6c2cbcSwdenk
16997f6c2cbcSwdenk		CFG_ISA_IO_OFFSET
17007f6c2cbcSwdenk
17017f6c2cbcSwdenk		defines the offset of register from address. It
17027f6c2cbcSwdenk		depends on which part of the data bus is connected to
17037f6c2cbcSwdenk		the fdc chipset. (default value 0)
17047f6c2cbcSwdenk
17057f6c2cbcSwdenk		If CFG_ISA_IO_STRIDE CFG_ISA_IO_OFFSET and
17067f6c2cbcSwdenk		CFG_FDC_DRIVE_NUMBER are undefined, they take their
17077f6c2cbcSwdenk		default value.
17087f6c2cbcSwdenk
17097f6c2cbcSwdenk		if CFG_FDC_HW_INIT is defined, then the function
17107f6c2cbcSwdenk		fdc_hw_init() is called at the beginning of the FDC
17117f6c2cbcSwdenk		setup. fdc_hw_init() must be provided by the board
17127f6c2cbcSwdenk		source code. It is used to make hardware dependant
17137f6c2cbcSwdenk		initializations.
17147f6c2cbcSwdenk
1715c609719bSwdenk- CFG_IMMR:	Physical address of the Internal Memory Mapped
1716c609719bSwdenk		Register; DO NOT CHANGE! (11-4)
1717c609719bSwdenk		[MPC8xx systems only]
1718c609719bSwdenk
1719c609719bSwdenk- CFG_INIT_RAM_ADDR:
1720c609719bSwdenk
1721c609719bSwdenk		Start address of memory area tha can be used for
1722c609719bSwdenk		initial data and stack; please note that this must be
1723c609719bSwdenk		writable memory that is working WITHOUT special
1724c609719bSwdenk		initialization, i. e. you CANNOT use normal RAM which
1725c609719bSwdenk		will become available only after programming the
1726c609719bSwdenk		memory controller and running certain initialization
1727c609719bSwdenk		sequences.
1728c609719bSwdenk
1729c609719bSwdenk		U-Boot uses the following memory types:
1730c609719bSwdenk		- MPC8xx and MPC8260: IMMR (internal memory of the CPU)
1731c609719bSwdenk		- MPC824X: data cache
1732c609719bSwdenk		- PPC4xx:  data cache
1733c609719bSwdenk
173485ec0bccSwdenk- CFG_GBL_DATA_OFFSET:
1735c609719bSwdenk
1736c609719bSwdenk		Offset of the initial data structure in the memory
1737c609719bSwdenk		area defined by CFG_INIT_RAM_ADDR. Usually
173885ec0bccSwdenk		CFG_GBL_DATA_OFFSET is chosen such that the initial
1739c609719bSwdenk		data is located at the end of the available space
1740c609719bSwdenk		(sometimes written as (CFG_INIT_RAM_END -
1741c609719bSwdenk		CFG_INIT_DATA_SIZE), and the initial stack is just
1742c609719bSwdenk		below that area (growing from (CFG_INIT_RAM_ADDR +
174385ec0bccSwdenk		CFG_GBL_DATA_OFFSET) downward.
1744c609719bSwdenk
1745c609719bSwdenk	Note:
1746c609719bSwdenk		On the MPC824X (or other systems that use the data
1747c609719bSwdenk		cache for initial memory) the address chosen for
1748c609719bSwdenk		CFG_INIT_RAM_ADDR is basically arbitrary - it must
1749c609719bSwdenk		point to an otherwise UNUSED address space between
1750c609719bSwdenk		the top of RAM and the start of the PCI space.
1751c609719bSwdenk
1752c609719bSwdenk- CFG_SIUMCR:	SIU Module Configuration (11-6)
1753c609719bSwdenk
1754c609719bSwdenk- CFG_SYPCR:	System Protection Control (11-9)
1755c609719bSwdenk
1756c609719bSwdenk- CFG_TBSCR:	Time Base Status and Control (11-26)
1757c609719bSwdenk
1758c609719bSwdenk- CFG_PISCR:	Periodic Interrupt Status and Control (11-31)
1759c609719bSwdenk
1760c609719bSwdenk- CFG_PLPRCR:	PLL, Low-Power, and Reset Control Register (15-30)
1761c609719bSwdenk
1762c609719bSwdenk- CFG_SCCR:	System Clock and reset Control Register (15-27)
1763c609719bSwdenk
1764c609719bSwdenk- CFG_OR_TIMING_SDRAM:
1765c609719bSwdenk		SDRAM timing
1766c609719bSwdenk
1767c609719bSwdenk- CFG_MAMR_PTA:
1768c609719bSwdenk		periodic timer for refresh
1769c609719bSwdenk
1770c609719bSwdenk- CFG_DER:	Debug Event Register (37-47)
1771c609719bSwdenk
1772c609719bSwdenk- FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CFG_REMAP_OR_AM,
1773c609719bSwdenk  CFG_PRELIM_OR_AM, CFG_OR_TIMING_FLASH, CFG_OR0_REMAP,
1774c609719bSwdenk  CFG_OR0_PRELIM, CFG_BR0_PRELIM, CFG_OR1_REMAP, CFG_OR1_PRELIM,
1775c609719bSwdenk  CFG_BR1_PRELIM:
1776c609719bSwdenk		Memory Controller Definitions: BR0/1 and OR0/1 (FLASH)
1777c609719bSwdenk
1778c609719bSwdenk- SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE,
1779c609719bSwdenk  CFG_OR_TIMING_SDRAM, CFG_OR2_PRELIM, CFG_BR2_PRELIM,
1780c609719bSwdenk  CFG_OR3_PRELIM, CFG_BR3_PRELIM:
1781c609719bSwdenk		Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM)
1782c609719bSwdenk
1783c609719bSwdenk- CFG_MAMR_PTA, CFG_MPTPR_2BK_4K, CFG_MPTPR_1BK_4K, CFG_MPTPR_2BK_8K,
1784c609719bSwdenk  CFG_MPTPR_1BK_8K, CFG_MAMR_8COL, CFG_MAMR_9COL:
1785c609719bSwdenk		Machine Mode Register and Memory Periodic Timer
1786c609719bSwdenk		Prescaler definitions (SDRAM timing)
1787c609719bSwdenk
1788c609719bSwdenk- CFG_I2C_UCODE_PATCH, CFG_I2C_DPMEM_OFFSET [0x1FC0]:
1789c609719bSwdenk		enable I2C microcode relocation patch (MPC8xx);
1790c609719bSwdenk		define relocation offset in DPRAM [DSP2]
1791c609719bSwdenk
1792c609719bSwdenk- CFG_SPI_UCODE_PATCH, CFG_SPI_DPMEM_OFFSET [0x1FC0]:
1793c609719bSwdenk		enable SPI microcode relocation patch (MPC8xx);
1794c609719bSwdenk		define relocation offset in DPRAM [SCC4]
1795c609719bSwdenk
1796c609719bSwdenk- CFG_USE_OSCCLK:
1797c609719bSwdenk		Use OSCM clock mode on MBX8xx board. Be careful,
1798c609719bSwdenk		wrong setting might damage your board. Read
1799c609719bSwdenk		doc/README.MBX before setting this variable!
1800c609719bSwdenk
1801ea909b76Swdenk- CFG_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only)
1802ea909b76Swdenk		Offset of the bootmode word in DPRAM used by post
1803ea909b76Swdenk		(Power On Self Tests). This definition overrides
1804ea909b76Swdenk		#define'd default value in commproc.h resp.
1805ea909b76Swdenk		cpm_8260.h.
1806ea909b76Swdenk
18075d232d0eSwdenk- CFG_PCI_SLV_MEM_LOCAL, CFG_PCI_SLV_MEM_BUS, CFG_PICMR0_MASK_ATTRIB,
18085d232d0eSwdenk  CFG_PCI_MSTR0_LOCAL, CFG_PCIMSK0_MASK, CFG_PCI_MSTR1_LOCAL,
18095d232d0eSwdenk  CFG_PCIMSK1_MASK, CFG_PCI_MSTR_MEM_LOCAL, CFG_PCI_MSTR_MEM_BUS,
18105d232d0eSwdenk  CFG_CPU_PCI_MEM_START, CFG_PCI_MSTR_MEM_SIZE, CFG_POCMR0_MASK_ATTRIB,
18115d232d0eSwdenk  CFG_PCI_MSTR_MEMIO_LOCAL, CFG_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START,
18125d232d0eSwdenk  CFG_PCI_MSTR_MEMIO_SIZE, CFG_POCMR1_MASK_ATTRIB, CFG_PCI_MSTR_IO_LOCAL,
18135d232d0eSwdenk  CFG_PCI_MSTR_IO_BUS, CFG_CPU_PCI_IO_START, CFG_PCI_MSTR_IO_SIZE,
18145d232d0eSwdenk  CFG_POCMR2_MASK_ATTRIB: (MPC826x only)
18155d232d0eSwdenk		Overrides the default PCI memory map in cpu/mpc8260/pci.c if set.
18165d232d0eSwdenk
1817c609719bSwdenkBuilding the Software:
1818c609719bSwdenk======================
1819c609719bSwdenk
1820c609719bSwdenkBuilding U-Boot has been tested in native PPC environments (on a
1821c609719bSwdenkPowerBook G3 running LinuxPPC 2000) and in cross environments
1822c609719bSwdenk(running RedHat 6.x and 7.x Linux on x86, Solaris 2.6 on a SPARC, and
1823c609719bSwdenkNetBSD 1.5 on x86).
1824c609719bSwdenk
1825c609719bSwdenkIf you are not using a native PPC environment, it is assumed that you
1826c609719bSwdenkhave the GNU cross compiling tools available in your path and named
1827c609719bSwdenkwith a prefix of "powerpc-linux-". If this is not the case, (e.g. if
1828c609719bSwdenkyou are using Monta Vista's Hard Hat Linux CDK 1.2) you must change
1829c609719bSwdenkthe definition of CROSS_COMPILE in Makefile. For HHL on a 4xx CPU,
1830c609719bSwdenkchange it to:
1831c609719bSwdenk
1832c609719bSwdenk	CROSS_COMPILE = ppc_4xx-
1833c609719bSwdenk
1834c609719bSwdenk
1835c609719bSwdenkU-Boot is intended to be  simple  to  build.  After  installing  the
1836c609719bSwdenksources	 you must configure U-Boot for one specific board type. This
1837c609719bSwdenkis done by typing:
1838c609719bSwdenk
1839c609719bSwdenk	make NAME_config
1840c609719bSwdenk
1841c609719bSwdenkwhere "NAME_config" is the name of one of the existing
1842c609719bSwdenkconfigurations; the following names are supported:
1843c609719bSwdenk
1844c609719bSwdenk    ADCIOP_config	  GTH_config		TQM850L_config
1845c609719bSwdenk    ADS860_config	  IP860_config		TQM855L_config
1846c609719bSwdenk    AR405_config	  IVML24_config		TQM860L_config
1847c609719bSwdenk    CANBT_config	  IVMS8_config		WALNUT405_config
1848c609719bSwdenk    CPCI405_config	  LANTEC_config		cogent_common_config
1849c609719bSwdenk    CPCIISER4_config	  MBX_config		cogent_mpc8260_config
1850c609719bSwdenk    CU824_config	  MBX860T_config	cogent_mpc8xx_config
1851c609719bSwdenk    ESTEEM192E_config	  RPXlite_config	hermes_config
1852c609719bSwdenk    ETX094_config	  RPXsuper_config	hymod_config
1853c609719bSwdenk    FADS823_config	  SM850_config		lwmon_config
1854c609719bSwdenk    FADS850SAR_config	  SPD823TS_config	pcu_e_config
1855c609719bSwdenk    FADS860T_config	  SXNI855T_config	rsdproto_config
1856c609719bSwdenk    FPS850L_config	  Sandpoint8240_config	sbc8260_config
1857c609719bSwdenk    GENIETV_config	  TQM823L_config	PIP405_config
1858384ae025Swdenk    GEN860T_config	  EBONY_config		FPS860L_config
18597f70e853Swdenk    ELPT860_config	  cmi_mpc5xx_config	NETVIA_config
18602abbe075Swdenk    at91rm9200dk_config
1861c609719bSwdenk
1862c609719bSwdenkNote: for some board special configuration names may exist; check  if
1863c609719bSwdenk      additional  information is available from the board vendor; for
1864c609719bSwdenk      instance, the TQM8xxL systems run normally at 50 MHz and use  a
1865c609719bSwdenk      SCC  for	10baseT	 ethernet; there are also systems with 80 MHz
1866c609719bSwdenk      CPU clock, and an optional Fast Ethernet	module	is  available
1867c609719bSwdenk      for  CPU's  with FEC. You can select such additional "features"
1868c609719bSwdenk      when chosing the configuration, i. e.
1869c609719bSwdenk
1870c609719bSwdenk      make TQM860L_config
1871c609719bSwdenk	- will configure for a plain TQM860L, i. e. 50MHz, no FEC
1872c609719bSwdenk
1873c609719bSwdenk      make TQM860L_FEC_config
1874c609719bSwdenk	- will configure for a TQM860L at 50MHz with FEC for ethernet
1875c609719bSwdenk
1876c609719bSwdenk      make TQM860L_80MHz_config
1877c609719bSwdenk	- will configure for a TQM860L at 80 MHz, with normal 10baseT
1878c609719bSwdenk	  interface
1879c609719bSwdenk
1880c609719bSwdenk      make TQM860L_FEC_80MHz_config
1881c609719bSwdenk	- will configure for a TQM860L at 80 MHz with FEC for ethernet
1882c609719bSwdenk
1883c609719bSwdenk      make TQM823L_LCD_config
1884c609719bSwdenk	- will configure for a TQM823L with U-Boot console on LCD
1885c609719bSwdenk
1886c609719bSwdenk      make TQM823L_LCD_80MHz_config
1887c609719bSwdenk	- will configure for a TQM823L at 80 MHz with U-Boot console on LCD
1888c609719bSwdenk
1889c609719bSwdenk      etc.
1890c609719bSwdenk
1891c609719bSwdenk
1892c609719bSwdenkFinally, type "make all", and you should get some working U-Boot
1893c609719bSwdenkimages ready for downlod to / installation on your system:
1894c609719bSwdenk
1895c609719bSwdenk- "u-boot.bin" is a raw binary image
1896c609719bSwdenk- "u-boot" is an image in ELF binary format
1897c609719bSwdenk- "u-boot.srec" is in Motorola S-Record format
1898c609719bSwdenk
1899c609719bSwdenk
1900c609719bSwdenkPlease be aware that the Makefiles assume you are using GNU make, so
1901c609719bSwdenkfor instance on NetBSD you might need to use "gmake" instead of
1902c609719bSwdenknative "make".
1903c609719bSwdenk
1904c609719bSwdenk
1905c609719bSwdenkIf the system board that you have is not listed, then you will need
1906c609719bSwdenkto port U-Boot to your hardware platform. To do this, follow these
1907c609719bSwdenksteps:
1908c609719bSwdenk
1909c609719bSwdenk1.  Add a new configuration option for your board to the toplevel
191085ec0bccSwdenk    "Makefile" and to the "MAKEALL" script, using the existing
191185ec0bccSwdenk    entries as examples. Note that here and at many other places
191285ec0bccSwdenk    boards and other names are listed alphabetically sorted. Please
191385ec0bccSwdenk    keep this order.
1914c609719bSwdenk2.  Create a new directory to hold your board specific code. Add any
191585ec0bccSwdenk    files you need. In your board directory, you will need at least
191685ec0bccSwdenk    the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds".
191785ec0bccSwdenk3.  Create a new configuration file "include/configs/<board>.h" for
191885ec0bccSwdenk    your board
1919c609719bSwdenk3.  If you're porting U-Boot to a new CPU, then also create a new
1920c609719bSwdenk    directory to hold your CPU specific code. Add any files you need.
192185ec0bccSwdenk4.  Run "make <board>_config" with your new name.
1922c609719bSwdenk5.  Type "make", and you should get a working "u-boot.srec" file
1923c609719bSwdenk    to be installed on your target system.
192485ec0bccSwdenk6.  Debug and solve any problems that might arise.
1925c609719bSwdenk    [Of course, this last step is much harder than it sounds.]
1926c609719bSwdenk
1927c609719bSwdenk
1928c609719bSwdenkTesting of U-Boot Modifications, Ports to New Hardware, etc.:
1929c609719bSwdenk==============================================================
1930c609719bSwdenk
1931c609719bSwdenkIf you have modified U-Boot sources (for instance added a new	board
1932c609719bSwdenkor  support  for  new  devices,	 a new CPU, etc.) you are expected to
1933c609719bSwdenkprovide feedback to the other developers. The feedback normally takes
1934c609719bSwdenkthe form of a "patch", i. e. a context diff against a certain (latest
1935c609719bSwdenkofficial or latest in CVS) version of U-Boot sources.
1936c609719bSwdenk
1937c609719bSwdenkBut before you submit such a patch, please verify that	your  modifi-
1938c609719bSwdenkcation	did not break existing code. At least make sure that *ALL* of
1939c609719bSwdenkthe supported boards compile WITHOUT ANY compiler warnings. To do so,
1940c609719bSwdenkjust run the "MAKEALL" script, which will configure and build U-Boot
1941c609719bSwdenkfor ALL supported system. Be warned, this will take a while. You  can
1942c609719bSwdenkselect	which  (cross)	compiler  to use py passing a `CROSS_COMPILE'
1943c609719bSwdenkenvironment variable to the script, i. e. to use the cross tools from
1944c609719bSwdenkMontaVista's Hard Hat Linux you can type
1945c609719bSwdenk
1946c609719bSwdenk	CROSS_COMPILE=ppc_8xx- MAKEALL
1947c609719bSwdenk
1948c609719bSwdenkor to build on a native PowerPC system you can type
1949c609719bSwdenk
1950c609719bSwdenk	CROSS_COMPILE=' ' MAKEALL
1951c609719bSwdenk
1952c609719bSwdenkSee also "U-Boot Porting Guide" below.
1953c609719bSwdenk
1954c609719bSwdenk
1955c609719bSwdenkMonitor Commands - Overview:
1956c609719bSwdenk============================
1957c609719bSwdenk
1958c609719bSwdenkgo	- start application at address 'addr'
1959c609719bSwdenkrun	- run commands in an environment variable
1960c609719bSwdenkbootm	- boot application image from memory
1961c609719bSwdenkbootp	- boot image via network using BootP/TFTP protocol
1962c609719bSwdenktftpboot- boot image via network using TFTP protocol
1963c609719bSwdenk	       and env variables "ipaddr" and "serverip"
1964c609719bSwdenk	       (and eventually "gatewayip")
1965c609719bSwdenkrarpboot- boot image via network using RARP/TFTP protocol
1966c609719bSwdenkdiskboot- boot from IDE devicebootd   - boot default, i.e., run 'bootcmd'
1967c609719bSwdenkloads	- load S-Record file over serial line
1968c609719bSwdenkloadb	- load binary file over serial line (kermit mode)
1969c609719bSwdenkmd	- memory display
1970c609719bSwdenkmm	- memory modify (auto-incrementing)
1971c609719bSwdenknm	- memory modify (constant address)
1972c609719bSwdenkmw	- memory write (fill)
1973c609719bSwdenkcp	- memory copy
1974c609719bSwdenkcmp	- memory compare
1975c609719bSwdenkcrc32	- checksum calculation
1976c609719bSwdenkimd     - i2c memory display
1977c609719bSwdenkimm     - i2c memory modify (auto-incrementing)
1978c609719bSwdenkinm     - i2c memory modify (constant address)
1979c609719bSwdenkimw     - i2c memory write (fill)
1980c609719bSwdenkicrc32  - i2c checksum calculation
1981c609719bSwdenkiprobe  - probe to discover valid I2C chip addresses
1982c609719bSwdenkiloop   - infinite loop on address range
1983c609719bSwdenkisdram  - print SDRAM configuration information
1984c609719bSwdenksspi    - SPI utility commands
1985c609719bSwdenkbase	- print or set address offset
1986c609719bSwdenkprintenv- print environment variables
1987c609719bSwdenksetenv	- set environment variables
1988c609719bSwdenksaveenv - save environment variables to persistent storage
1989c609719bSwdenkprotect - enable or disable FLASH write protection
1990c609719bSwdenkerase	- erase FLASH memory
1991c609719bSwdenkflinfo	- print FLASH memory information
1992c609719bSwdenkbdinfo	- print Board Info structure
1993c609719bSwdenkiminfo	- print header information for application image
1994c609719bSwdenkconinfo - print console devices and informations
1995c609719bSwdenkide	- IDE sub-system
1996c609719bSwdenkloop	- infinite loop on address range
1997c609719bSwdenkmtest	- simple RAM test
1998c609719bSwdenkicache	- enable or disable instruction cache
1999c609719bSwdenkdcache	- enable or disable data cache
2000c609719bSwdenkreset	- Perform RESET of the CPU
2001c609719bSwdenkecho	- echo args to console
2002c609719bSwdenkversion - print monitor version
2003c609719bSwdenkhelp	- print online help
2004c609719bSwdenk?	- alias for 'help'
2005c609719bSwdenk
2006c609719bSwdenk
2007c609719bSwdenkMonitor Commands - Detailed Description:
2008c609719bSwdenk========================================
2009c609719bSwdenk
2010c609719bSwdenkTODO.
2011c609719bSwdenk
2012c609719bSwdenkFor now: just type "help <command>".
2013c609719bSwdenk
2014c609719bSwdenk
2015c609719bSwdenkEnvironment Variables:
2016c609719bSwdenk======================
2017c609719bSwdenk
2018c609719bSwdenkU-Boot supports user configuration using Environment Variables which
2019c609719bSwdenkcan be made persistent by saving to Flash memory.
2020c609719bSwdenk
2021c609719bSwdenkEnvironment Variables are set using "setenv", printed using
2022c609719bSwdenk"printenv", and saved to Flash using "saveenv". Using "setenv"
2023c609719bSwdenkwithout a value can be used to delete a variable from the
2024c609719bSwdenkenvironment. As long as you don't save the environment you are
2025c609719bSwdenkworking with an in-memory copy. In case the Flash area containing the
2026c609719bSwdenkenvironment is erased by accident, a default environment is provided.
2027c609719bSwdenk
2028c609719bSwdenkSome configuration options can be set using Environment Variables:
2029c609719bSwdenk
2030c609719bSwdenk  baudrate	- see CONFIG_BAUDRATE
2031c609719bSwdenk
2032c609719bSwdenk  bootdelay	- see CONFIG_BOOTDELAY
2033c609719bSwdenk
2034c609719bSwdenk  bootcmd	- see CONFIG_BOOTCOMMAND
2035c609719bSwdenk
2036c609719bSwdenk  bootargs	- Boot arguments when booting an RTOS image
2037c609719bSwdenk
2038c609719bSwdenk  bootfile	- Name of the image to load with TFTP
2039c609719bSwdenk
2040c609719bSwdenk  autoload	- if set to "no" (any string beginning with 'n'),
2041c609719bSwdenk		  "bootp" will just load perform a lookup of the
2042c609719bSwdenk		  configuration from the BOOTP server, but not try to
2043c609719bSwdenk		  load any image using TFTP
2044c609719bSwdenk
2045c609719bSwdenk  autostart	- if set to "yes", an image loaded using the "bootp",
2046c609719bSwdenk		  "rarpboot", "tftpboot" or "diskboot" commands will
2047c609719bSwdenk		  be automatically started (by internally calling
2048c609719bSwdenk		  "bootm")
2049c609719bSwdenk
20504a6fd34bSwdenk		  If set to "no", a standalone image passed to the
20514a6fd34bSwdenk		  "bootm" command will be copied to the load address
20524a6fd34bSwdenk		  (and eventually uncompressed), but NOT be started.
20534a6fd34bSwdenk		  This can be used to load and uncompress arbitrary
20544a6fd34bSwdenk		  data.
20554a6fd34bSwdenk
2056c609719bSwdenk  initrd_high	- restrict positioning of initrd images:
2057c609719bSwdenk		  If this variable is not set, initrd images will be
2058c609719bSwdenk		  copied to the highest possible address in RAM; this
2059c609719bSwdenk		  is usually what you want since it allows for
2060c609719bSwdenk		  maximum initrd size. If for some reason you want to
2061c609719bSwdenk		  make sure that the initrd image is loaded below the
2062c609719bSwdenk		  CFG_BOOTMAPSZ limit, you can set this environment
2063c609719bSwdenk		  variable to a value of "no" or "off" or "0".
2064c609719bSwdenk		  Alternatively, you can set it to a maximum upper
2065c609719bSwdenk		  address to use (U-Boot will still check that it
2066c609719bSwdenk		  does not overwrite the U-Boot stack and data).
2067c609719bSwdenk
2068c609719bSwdenk		  For instance, when you have a system with 16 MB
2069c609719bSwdenk		  RAM, and want to reseve 4 MB from use by Linux,
2070c609719bSwdenk		  you can do this by adding "mem=12M" to the value of
2071c609719bSwdenk		  the "bootargs" variable. However, now you must make
2072c609719bSwdenk		  sure, that the initrd image is placed in the first
2073c609719bSwdenk		  12 MB as well - this can be done with
2074c609719bSwdenk
2075c609719bSwdenk		  setenv initrd_high 00c00000
2076c609719bSwdenk
207738b99261Swdenk		  If you set initrd_high to 0xFFFFFFFF, this is an
207838b99261Swdenk		  indication to U-Boot that all addresses are legal
207938b99261Swdenk		  for the Linux kernel, including addresses in flash
208038b99261Swdenk		  memory. In this case U-Boot will NOT COPY the
208138b99261Swdenk		  ramdisk at all. This may be useful to reduce the
208238b99261Swdenk		  boot time on your system, but requires that this
208338b99261Swdenk		  feature is supported by your Linux kernel.
208438b99261Swdenk
2085c609719bSwdenk  ipaddr	- IP address; needed for tftpboot command
2086c609719bSwdenk
2087c609719bSwdenk  loadaddr	- Default load address for commands like "bootp",
2088dc7c9a1aSwdenk		  "rarpboot", "tftpboot", "loadb" or "diskboot"
2089c609719bSwdenk
2090c609719bSwdenk  loads_echo	- see CONFIG_LOADS_ECHO
2091c609719bSwdenk
2092c609719bSwdenk  serverip	- TFTP server IP address; needed for tftpboot command
2093c609719bSwdenk
2094c609719bSwdenk  bootretry	- see CONFIG_BOOT_RETRY_TIME
2095c609719bSwdenk
2096c609719bSwdenk  bootdelaykey	- see CONFIG_AUTOBOOT_DELAY_STR
2097c609719bSwdenk
2098c609719bSwdenk  bootstopkey	- see CONFIG_AUTOBOOT_STOP_STR
2099c609719bSwdenk
2100c609719bSwdenk
2101c609719bSwdenkThe following environment variables may be used and automatically
2102c609719bSwdenkupdated by the network boot commands ("bootp" and "rarpboot"),
2103c609719bSwdenkdepending the information provided by your boot server:
2104c609719bSwdenk
2105c609719bSwdenk  bootfile	- see above
2106c609719bSwdenk  dnsip		- IP address of your Domain Name Server
2107c609719bSwdenk  gatewayip	- IP address of the Gateway (Router) to use
2108c609719bSwdenk  hostname	- Target hostname
2109c609719bSwdenk  ipaddr	- see above
2110c609719bSwdenk  netmask	- Subnet Mask
2111c609719bSwdenk  rootpath	- Pathname of the root filesystem on the NFS server
2112c609719bSwdenk  serverip	- see above
2113c609719bSwdenk
2114c609719bSwdenk
2115c609719bSwdenkThere are two special Environment Variables:
2116c609719bSwdenk
2117c609719bSwdenk  serial#	- contains hardware identification information such
2118c609719bSwdenk		  as type string and/or serial number
2119c609719bSwdenk  ethaddr	- Ethernet address
2120c609719bSwdenk
2121c609719bSwdenkThese variables can be set only once (usually during manufacturing of
2122c609719bSwdenkthe board). U-Boot refuses to delete or overwrite these variables
2123c609719bSwdenkonce they have been set once.
2124c609719bSwdenk
2125c609719bSwdenk
2126c1551ea8SstroeseFurther special Environment Variables:
2127c1551ea8Sstroese
2128c1551ea8Sstroese  ver		- Contains the U-Boot version string as printed
2129c1551ea8Sstroese		  with the "version" command. This variable is
2130c1551ea8Sstroese		  readonly (see CONFIG_VERSION_VARIABLE).
2131c1551ea8Sstroese
2132c1551ea8Sstroese
2133c609719bSwdenkPlease note that changes to some configuration parameters may take
2134c609719bSwdenkonly effect after the next boot (yes, that's just like Windoze :-).
2135c609719bSwdenk
2136c609719bSwdenk
2137f07771ccSwdenkCommand Line Parsing:
2138f07771ccSwdenk=====================
2139f07771ccSwdenk
2140f07771ccSwdenkThere are two different command line parsers available  with  U-Boot:
2141f07771ccSwdenkthe old "simple" one, and the much more pwerful "hush" shell:
2142f07771ccSwdenk
2143f07771ccSwdenkOld, simple command line parser:
2144f07771ccSwdenk--------------------------------
2145f07771ccSwdenk
2146f07771ccSwdenk- supports environment variables (through setenv / saveenv commands)
2147f07771ccSwdenk- several commands on one line, separated by ';'
2148f07771ccSwdenk- variable substitution using "... $(name) ..." syntax
2149f07771ccSwdenk- special characters ('$', ';') can be escaped by prefixing with '\',
2150f07771ccSwdenk  for example:
2151f07771ccSwdenk	setenv bootcmd bootm \$(address)
2152f07771ccSwdenk- You can also escape text by enclosing in single apostrophes, for example:
2153f07771ccSwdenk	setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off'
2154f07771ccSwdenk
2155f07771ccSwdenkHush shell:
2156f07771ccSwdenk-----------
2157f07771ccSwdenk
2158f07771ccSwdenk- similar to Bourne shell, with control structures like
2159f07771ccSwdenk  if...then...else...fi, for...do...done; while...do...done,
2160f07771ccSwdenk  until...do...done, ...
2161f07771ccSwdenk- supports environment ("global") variables (through setenv / saveenv
2162f07771ccSwdenk  commands) and local shell variables (through standard shell syntax
2163f07771ccSwdenk  "name=value"); only environment variables can be used with "run"
2164f07771ccSwdenk  command
2165f07771ccSwdenk
2166f07771ccSwdenkGeneral rules:
2167f07771ccSwdenk--------------
2168f07771ccSwdenk
2169f07771ccSwdenk(1) If a command line (or an environment variable executed by a "run"
2170f07771ccSwdenk    command) contains several commands separated by semicolon, and
2171f07771ccSwdenk    one of these commands fails, then the remaining commands will be
2172f07771ccSwdenk    executed anyway.
2173f07771ccSwdenk
2174f07771ccSwdenk(2) If you execute several variables with one call to run (i. e.
2175f07771ccSwdenk    calling run with a list af variables as arguments), any failing
2176f07771ccSwdenk    command will cause "run" to terminate, i. e. the remaining
2177f07771ccSwdenk    variables are not executed.
2178f07771ccSwdenk
2179c609719bSwdenkNote for Redundant Ethernet Interfaces:
2180c609719bSwdenk=======================================
2181c609719bSwdenk
2182c609719bSwdenkSome boards come with redundand ethernet interfaces; U-Boot supports
2183c609719bSwdenksuch configurations and is capable of automatic selection of a
2184c609719bSwdenk"working" interface when needed. MAC assignemnt works as follows:
2185c609719bSwdenk
2186c609719bSwdenkNetwork interfaces are numbered eth0, eth1, eth2, ... Corresponding
2187c609719bSwdenkMAC addresses can be stored in the environment as "ethaddr" (=>eth0),
2188c609719bSwdenk"eth1addr" (=>eth1), "eth2addr", ...
2189c609719bSwdenk
2190c609719bSwdenkIf the network interface stores some valid MAC address (for instance
2191c609719bSwdenkin SROM), this is used as default address if there is NO correspon-
2192c609719bSwdenkding setting in the environment; if the corresponding environment
2193c609719bSwdenkvariable is set, this overrides the settings in the card; that means:
2194c609719bSwdenk
2195c609719bSwdenko If the SROM has a valid MAC address, and there is no address in the
2196c609719bSwdenk  environment, the SROM's address is used.
2197c609719bSwdenk
2198c609719bSwdenko If there is no valid address in the SROM, and a definition in the
2199c609719bSwdenk  environment exists, then the value from the environment variable is
2200c609719bSwdenk  used.
2201c609719bSwdenk
2202c609719bSwdenko If both the SROM and the environment contain a MAC address, and
2203c609719bSwdenk  both addresses are the same, this MAC address is used.
2204c609719bSwdenk
2205c609719bSwdenko If both the SROM and the environment contain a MAC address, and the
2206c609719bSwdenk  addresses differ, the value from the environment is used and a
2207c609719bSwdenk  warning is printed.
2208c609719bSwdenk
2209c609719bSwdenko If neither SROM nor the environment contain a MAC address, an error
2210c609719bSwdenk  is raised.
2211c609719bSwdenk
2212c609719bSwdenk
2213c609719bSwdenkImage Formats:
2214c609719bSwdenk==============
2215c609719bSwdenk
2216c609719bSwdenkThe "boot" commands of this monitor operate on "image" files which
2217c609719bSwdenkcan be basicly anything, preceeded by a special header; see the
2218c609719bSwdenkdefinitions in include/image.h for details; basicly, the header
2219c609719bSwdenkdefines the following image properties:
2220c609719bSwdenk
2221c609719bSwdenk* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD,
2222c609719bSwdenk  4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks,
22237f70e853Swdenk  LynxOS, pSOS, QNX, RTEMS, ARTOS;
22247f70e853Swdenk  Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, ARTOS).
2225c609719bSwdenk* Target CPU Architecture (Provisions for Alpha, ARM, Intel x86,
2226c609719bSwdenk  IA64, MIPS, MIPS, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit;
2227c609719bSwdenk  Currently supported: PowerPC).
2228c609719bSwdenk* Compression Type (Provisions for uncompressed, gzip, bzip2;
2229c609719bSwdenk  Currently supported: uncompressed, gzip).
2230c609719bSwdenk* Load Address
2231c609719bSwdenk* Entry Point
2232c609719bSwdenk* Image Name
2233c609719bSwdenk* Image Timestamp
2234c609719bSwdenk
2235c609719bSwdenkThe header is marked by a special Magic Number, and both the header
2236c609719bSwdenkand the data portions of the image are secured against corruption by
2237c609719bSwdenkCRC32 checksums.
2238c609719bSwdenk
2239c609719bSwdenk
2240c609719bSwdenkLinux Support:
2241c609719bSwdenk==============
2242c609719bSwdenk
2243c609719bSwdenkAlthough U-Boot should support any OS or standalone application
2244c609719bSwdenkeasily, Linux has always been in the focus during the design of
2245c609719bSwdenkU-Boot.
2246c609719bSwdenk
2247c609719bSwdenkU-Boot includes many features that so far have been part of some
2248c609719bSwdenkspecial "boot loader" code within the Linux kernel. Also, any
2249c609719bSwdenk"initrd" images to be used are no longer part of one big Linux image;
2250c609719bSwdenkinstead, kernel and "initrd" are separate images. This implementation
2251c609719bSwdenkserves serveral purposes:
2252c609719bSwdenk
2253c609719bSwdenk- the same features can be used for other OS or standalone
2254c609719bSwdenk  applications (for instance: using compressed images to reduce the
2255c609719bSwdenk  Flash memory footprint)
2256c609719bSwdenk
2257c609719bSwdenk- it becomes much easier to port new Linux kernel versions because
2258c609719bSwdenk  lots of low-level, hardware dependend stuff are done by U-Boot
2259c609719bSwdenk
2260c609719bSwdenk- the same Linux kernel image can now be used with different "initrd"
2261c609719bSwdenk  images; of course this also means that different kernel images can
2262c609719bSwdenk  be run with the same "initrd". This makes testing easier (you don't
2263c609719bSwdenk  have to build a new "zImage.initrd" Linux image when you just
2264c609719bSwdenk  change a file in your "initrd"). Also, a field-upgrade of the
2265c609719bSwdenk  software is easier now.
2266c609719bSwdenk
2267c609719bSwdenk
2268c609719bSwdenkLinux HOWTO:
2269c609719bSwdenk============
2270c609719bSwdenk
2271c609719bSwdenkPorting Linux to U-Boot based systems:
2272c609719bSwdenk---------------------------------------
2273c609719bSwdenk
2274c609719bSwdenkU-Boot cannot save you from doing all the necessary modifications to
2275c609719bSwdenkconfigure the Linux device drivers for use with your target hardware
2276c609719bSwdenk(no, we don't intend to provide a full virtual machine interface to
2277c609719bSwdenkLinux :-).
2278c609719bSwdenk
2279c609719bSwdenkBut now you can ignore ALL boot loader code (in arch/ppc/mbxboot).
2280c609719bSwdenk
2281c609719bSwdenkJust make sure your machine specific header file (for instance
2282c609719bSwdenkinclude/asm-ppc/tqm8xx.h) includes the same definition of the Board
2283c609719bSwdenkInformation structure as we define in include/u-boot.h, and make
2284c609719bSwdenksure that your definition of IMAP_ADDR uses the same value as your
2285c609719bSwdenkU-Boot configuration in CFG_IMMR.
2286c609719bSwdenk
2287c609719bSwdenk
2288c609719bSwdenkConfiguring the Linux kernel:
2289c609719bSwdenk-----------------------------
2290c609719bSwdenk
2291c609719bSwdenkNo specific requirements for U-Boot. Make sure you have some root
2292c609719bSwdenkdevice (initial ramdisk, NFS) for your target system.
2293c609719bSwdenk
2294c609719bSwdenk
2295c609719bSwdenkBuilding a Linux Image:
2296c609719bSwdenk-----------------------
2297c609719bSwdenk
229824ee89b9SwdenkWith U-Boot, "normal" build targets like "zImage" or "bzImage" are
229924ee89b9Swdenknot used. If you use recent kernel source, a new build target
230024ee89b9Swdenk"uImage" will exist which automatically builds an image usable by
230124ee89b9SwdenkU-Boot. Most older kernels also have support for a "pImage" target,
230224ee89b9Swdenkwhich was introduced for our predecessor project PPCBoot and uses a
230324ee89b9Swdenk100% compatible format.
2304c609719bSwdenk
2305c609719bSwdenkExample:
2306c609719bSwdenk
2307c609719bSwdenk	make TQM850L_config
2308c609719bSwdenk	make oldconfig
2309c609719bSwdenk	make dep
231024ee89b9Swdenk	make uImage
2311c609719bSwdenk
231224ee89b9SwdenkThe "uImage" build target uses a special tool (in 'tools/mkimage') to
231324ee89b9Swdenkencapsulate a compressed Linux kernel image with header  information,
231424ee89b9SwdenkCRC32 checksum etc. for use with U-Boot. This is what we are doing:
2315c609719bSwdenk
231624ee89b9Swdenk* build a standard "vmlinux" kernel image (in ELF binary format):
231724ee89b9Swdenk
231824ee89b9Swdenk* convert the kernel into a raw binary image:
231924ee89b9Swdenk
232024ee89b9Swdenk	${CROSS_COMPILE}-objcopy -O binary \
232124ee89b9Swdenk				 -R .note -R .comment \
232224ee89b9Swdenk				 -S vmlinux linux.bin
232324ee89b9Swdenk
232424ee89b9Swdenk* compress the binary image:
232524ee89b9Swdenk
232624ee89b9Swdenk	gzip -9 linux.bin
232724ee89b9Swdenk
232824ee89b9Swdenk* package compressed binary image for U-Boot:
232924ee89b9Swdenk
233024ee89b9Swdenk	mkimage -A ppc -O linux -T kernel -C gzip \
233124ee89b9Swdenk		-a 0 -e 0 -n "Linux Kernel Image" \
233224ee89b9Swdenk		-d linux.bin.gz uImage
233324ee89b9Swdenk
233424ee89b9Swdenk
233524ee89b9SwdenkThe "mkimage" tool can also be used to create ramdisk images for use
233624ee89b9Swdenkwith U-Boot, either separated from the Linux kernel image, or
233724ee89b9Swdenkcombined into one file. "mkimage" encapsulates the images with a 64
233824ee89b9Swdenkbyte header containing information about target architecture,
233924ee89b9Swdenkoperating system, image type, compression method, entry points, time
234024ee89b9Swdenkstamp, CRC32 checksums, etc.
234124ee89b9Swdenk
234224ee89b9Swdenk"mkimage" can be called in two ways: to verify existing images and
234324ee89b9Swdenkprint the header information, or to build new images.
2344c609719bSwdenk
2345c609719bSwdenkIn the first form (with "-l" option) mkimage lists the information
2346c609719bSwdenkcontained in the header of an existing U-Boot image; this includes
2347c609719bSwdenkchecksum verification:
2348c609719bSwdenk
2349c609719bSwdenk	tools/mkimage -l image
2350c609719bSwdenk	  -l ==> list image header information
2351c609719bSwdenk
2352c609719bSwdenkThe second form (with "-d" option) is used to build a U-Boot image
2353c609719bSwdenkfrom a "data file" which is used as image payload:
2354c609719bSwdenk
2355c609719bSwdenk	tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \
2356c609719bSwdenk		      -n name -d data_file image
2357c609719bSwdenk	  -A ==> set architecture to 'arch'
2358c609719bSwdenk	  -O ==> set operating system to 'os'
2359c609719bSwdenk	  -T ==> set image type to 'type'
2360c609719bSwdenk	  -C ==> set compression type 'comp'
2361c609719bSwdenk	  -a ==> set load address to 'addr' (hex)
2362c609719bSwdenk	  -e ==> set entry point to 'ep' (hex)
2363c609719bSwdenk	  -n ==> set image name to 'name'
2364c609719bSwdenk	  -d ==> use image data from 'datafile'
2365c609719bSwdenk
2366c609719bSwdenkRight now, all Linux kernels use the same load address	(0x00000000),
2367c609719bSwdenkbut the entry point address depends on the kernel version:
2368c609719bSwdenk
2369c609719bSwdenk- 2.2.x kernels have the entry point at 0x0000000C,
237024ee89b9Swdenk- 2.3.x and later kernels have the entry point at 0x00000000.
2371c609719bSwdenk
2372c609719bSwdenkSo a typical call to build a U-Boot image would read:
2373c609719bSwdenk
237424ee89b9Swdenk	-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
237524ee89b9Swdenk	> -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \
237624ee89b9Swdenk	> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux.gz \
237724ee89b9Swdenk	> examples/uImage.TQM850L
237824ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
2379c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
2380c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (gzip compressed)
2381c609719bSwdenk	Data Size:    335725 Bytes = 327.86 kB = 0.32 MB
2382c609719bSwdenk	Load Address: 0x00000000
238324ee89b9Swdenk	Entry Point:  0x00000000
2384c609719bSwdenk
2385c609719bSwdenkTo verify the contents of the image (or check for corruption):
2386c609719bSwdenk
238724ee89b9Swdenk	-> tools/mkimage -l examples/uImage.TQM850L
238824ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
2389c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
2390c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (gzip compressed)
2391c609719bSwdenk	Data Size:    335725 Bytes = 327.86 kB = 0.32 MB
2392c609719bSwdenk	Load Address: 0x00000000
239324ee89b9Swdenk	Entry Point:  0x00000000
2394c609719bSwdenk
2395c609719bSwdenkNOTE: for embedded systems where boot time is critical you can trade
2396c609719bSwdenkspeed for memory and install an UNCOMPRESSED image instead: this
2397c609719bSwdenkneeds more space in Flash, but boots much faster since it does not
2398c609719bSwdenkneed to be uncompressed:
2399c609719bSwdenk
240024ee89b9Swdenk	-> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux.gz
240124ee89b9Swdenk	-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
240224ee89b9Swdenk	> -A ppc -O linux -T kernel -C none -a 0 -e 0 \
240324ee89b9Swdenk	> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux \
240424ee89b9Swdenk	> examples/uImage.TQM850L-uncompressed
240524ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
2406c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
2407c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (uncompressed)
2408c609719bSwdenk	Data Size:    792160 Bytes = 773.59 kB = 0.76 MB
2409c609719bSwdenk	Load Address: 0x00000000
241024ee89b9Swdenk	Entry Point:  0x00000000
2411c609719bSwdenk
2412c609719bSwdenk
2413c609719bSwdenkSimilar you can build U-Boot images from a 'ramdisk.image.gz' file
2414c609719bSwdenkwhen your kernel is intended to use an initial ramdisk:
2415c609719bSwdenk
2416c609719bSwdenk	-> tools/mkimage -n 'Simple Ramdisk Image' \
2417c609719bSwdenk	> -A ppc -O linux -T ramdisk -C gzip \
2418c609719bSwdenk	> -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd
2419c609719bSwdenk	Image Name:   Simple Ramdisk Image
2420c609719bSwdenk	Created:      Wed Jan 12 14:01:50 2000
2421c609719bSwdenk	Image Type:   PowerPC Linux RAMDisk Image (gzip compressed)
2422c609719bSwdenk	Data Size:    566530 Bytes = 553.25 kB = 0.54 MB
2423c609719bSwdenk	Load Address: 0x00000000
2424c609719bSwdenk	Entry Point:  0x00000000
2425c609719bSwdenk
2426c609719bSwdenk
2427c609719bSwdenkInstalling a Linux Image:
2428c609719bSwdenk-------------------------
2429c609719bSwdenk
2430c609719bSwdenkTo downloading a U-Boot image over the serial (console) interface,
2431c609719bSwdenkyou must convert the image to S-Record format:
2432c609719bSwdenk
2433c609719bSwdenk	objcopy -I binary -O srec examples/image examples/image.srec
2434c609719bSwdenk
2435c609719bSwdenkThe 'objcopy' does not understand the information in the U-Boot
2436c609719bSwdenkimage header, so the resulting S-Record file will be relative to
2437c609719bSwdenkaddress 0x00000000. To load it to a given address, you need to
2438c609719bSwdenkspecify the target address as 'offset' parameter with the 'loads'
2439c609719bSwdenkcommand.
2440c609719bSwdenk
2441c609719bSwdenkExample: install the image to address 0x40100000 (which on the
2442c609719bSwdenkTQM8xxL is in the first Flash bank):
2443c609719bSwdenk
2444c609719bSwdenk	=> erase 40100000 401FFFFF
2445c609719bSwdenk
2446c609719bSwdenk	.......... done
2447c609719bSwdenk	Erased 8 sectors
2448c609719bSwdenk
2449c609719bSwdenk	=> loads 40100000
2450c609719bSwdenk	## Ready for S-Record download ...
2451c609719bSwdenk	~>examples/image.srec
2452c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 12 13 ...
2453c609719bSwdenk	...
2454c609719bSwdenk	15989 15990 15991 15992
2455c609719bSwdenk	[file transfer complete]
2456c609719bSwdenk	[connected]
2457c609719bSwdenk	## Start Addr = 0x00000000
2458c609719bSwdenk
2459c609719bSwdenk
2460c609719bSwdenkYou can check the success of the download using the 'iminfo' command;
2461c609719bSwdenkthis includes a checksum verification so you  can  be  sure  no	 data
2462c609719bSwdenkcorruption happened:
2463c609719bSwdenk
2464c609719bSwdenk	=> imi 40100000
2465c609719bSwdenk
2466c609719bSwdenk	## Checking Image at 40100000 ...
2467c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
2468c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
2469c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
2470c609719bSwdenk	   Load Address: 00000000
2471c609719bSwdenk	   Entry Point:	 0000000c
2472c609719bSwdenk	   Verifying Checksum ... OK
2473c609719bSwdenk
2474c609719bSwdenk
2475c609719bSwdenkBoot Linux:
2476c609719bSwdenk-----------
2477c609719bSwdenk
2478c609719bSwdenkThe "bootm" command is used to boot an application that is stored in
2479c609719bSwdenkmemory (RAM or Flash). In case of a Linux kernel image, the contents
2480c609719bSwdenkof the "bootargs" environment variable is passed to the kernel as
2481c609719bSwdenkparameters. You can check and modify this variable using the
2482c609719bSwdenk"printenv" and "setenv" commands:
2483c609719bSwdenk
2484c609719bSwdenk
2485c609719bSwdenk	=> printenv bootargs
2486c609719bSwdenk	bootargs=root=/dev/ram
2487c609719bSwdenk
2488c609719bSwdenk	=> setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
2489c609719bSwdenk
2490c609719bSwdenk	=> printenv bootargs
2491c609719bSwdenk	bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
2492c609719bSwdenk
2493c609719bSwdenk	=> bootm 40020000
2494c609719bSwdenk	## Booting Linux kernel at 40020000 ...
2495c609719bSwdenk	   Image Name:	 2.2.13 for NFS on TQM850L
2496c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
2497c609719bSwdenk	   Data Size:	 381681 Bytes = 372 kB = 0 MB
2498c609719bSwdenk	   Load Address: 00000000
2499c609719bSwdenk	   Entry Point:	 0000000c
2500c609719bSwdenk	   Verifying Checksum ... OK
2501c609719bSwdenk	   Uncompressing Kernel Image ... OK
2502c609719bSwdenk	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
2503c609719bSwdenk	Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
2504c609719bSwdenk	time_init: decrementer frequency = 187500000/60
2505c609719bSwdenk	Calibrating delay loop... 49.77 BogoMIPS
2506c609719bSwdenk	Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000]
2507c609719bSwdenk	...
2508c609719bSwdenk
2509c609719bSwdenkIf you want to boot a Linux kernel with initial ram disk, you pass
2510c609719bSwdenkthe memory addreses of both the kernel and the initrd image (PPBCOOT
2511c609719bSwdenkformat!) to the "bootm" command:
2512c609719bSwdenk
2513c609719bSwdenk	=> imi 40100000 40200000
2514c609719bSwdenk
2515c609719bSwdenk	## Checking Image at 40100000 ...
2516c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
2517c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
2518c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
2519c609719bSwdenk	   Load Address: 00000000
2520c609719bSwdenk	   Entry Point:	 0000000c
2521c609719bSwdenk	   Verifying Checksum ... OK
2522c609719bSwdenk
2523c609719bSwdenk	## Checking Image at 40200000 ...
2524c609719bSwdenk	   Image Name:	 Simple Ramdisk Image
2525c609719bSwdenk	   Image Type:	 PowerPC Linux RAMDisk Image (gzip compressed)
2526c609719bSwdenk	   Data Size:	 566530 Bytes = 553 kB = 0 MB
2527c609719bSwdenk	   Load Address: 00000000
2528c609719bSwdenk	   Entry Point:	 00000000
2529c609719bSwdenk	   Verifying Checksum ... OK
2530c609719bSwdenk
2531c609719bSwdenk	=> bootm 40100000 40200000
2532c609719bSwdenk	## Booting Linux kernel at 40100000 ...
2533c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
2534c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
2535c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
2536c609719bSwdenk	   Load Address: 00000000
2537c609719bSwdenk	   Entry Point:	 0000000c
2538c609719bSwdenk	   Verifying Checksum ... OK
2539c609719bSwdenk	   Uncompressing Kernel Image ... OK
2540c609719bSwdenk	## Loading RAMDisk Image at 40200000 ...
2541c609719bSwdenk	   Image Name:	 Simple Ramdisk Image
2542c609719bSwdenk	   Image Type:	 PowerPC Linux RAMDisk Image (gzip compressed)
2543c609719bSwdenk	   Data Size:	 566530 Bytes = 553 kB = 0 MB
2544c609719bSwdenk	   Load Address: 00000000
2545c609719bSwdenk	   Entry Point:	 00000000
2546c609719bSwdenk	   Verifying Checksum ... OK
2547c609719bSwdenk	   Loading Ramdisk ... OK
2548c609719bSwdenk	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
2549c609719bSwdenk	Boot arguments: root=/dev/ram
2550c609719bSwdenk	time_init: decrementer frequency = 187500000/60
2551c609719bSwdenk	Calibrating delay loop... 49.77 BogoMIPS
2552c609719bSwdenk	...
2553c609719bSwdenk	RAMDISK: Compressed image found at block 0
2554c609719bSwdenk	VFS: Mounted root (ext2 filesystem).
2555c609719bSwdenk
2556c609719bSwdenk	bash#
2557c609719bSwdenk
25586069ff26SwdenkMore About U-Boot Image Types:
25596069ff26Swdenk------------------------------
25606069ff26Swdenk
25616069ff26SwdenkU-Boot supports the following image types:
25626069ff26Swdenk
25636069ff26Swdenk   "Standalone Programs" are directly runnable in the environment
25646069ff26Swdenk	provided by U-Boot; it is expected that (if they behave
25656069ff26Swdenk	well) you can continue to work in U-Boot after return from
25666069ff26Swdenk	the Standalone Program.
25676069ff26Swdenk   "OS Kernel Images" are usually images of some Embedded OS which
25686069ff26Swdenk	will take over control completely. Usually these programs
25696069ff26Swdenk	will install their own set of exception handlers, device
25706069ff26Swdenk	drivers, set up the MMU, etc. - this means, that you cannot
25716069ff26Swdenk	expect to re-enter U-Boot except by resetting the CPU.
25726069ff26Swdenk   "RAMDisk Images" are more or less just data blocks, and their
25736069ff26Swdenk	parameters (address, size) are passed to an OS kernel that is
25746069ff26Swdenk	being started.
25756069ff26Swdenk   "Multi-File Images" contain several images, typically an OS
25766069ff26Swdenk	(Linux) kernel image and one or more data images like
25776069ff26Swdenk	RAMDisks. This construct is useful for instance when you want
25786069ff26Swdenk	to boot over the network using BOOTP etc., where the boot
25796069ff26Swdenk	server provides just a single image file, but you want to get
25806069ff26Swdenk	for instance an OS kernel and a RAMDisk image.
25816069ff26Swdenk
25826069ff26Swdenk	"Multi-File Images" start with a list of image sizes, each
25836069ff26Swdenk	image size (in bytes) specified by an "uint32_t" in network
25846069ff26Swdenk	byte order. This list is terminated by an "(uint32_t)0".
25856069ff26Swdenk	Immediately after the terminating 0 follow the images, one by
25866069ff26Swdenk	one, all aligned on "uint32_t" boundaries (size rounded up to
25876069ff26Swdenk	a multiple of 4 bytes).
25886069ff26Swdenk
25896069ff26Swdenk   "Firmware Images" are binary images containing firmware (like
25906069ff26Swdenk	U-Boot or FPGA images) which usually will be programmed to
25916069ff26Swdenk	flash memory.
25926069ff26Swdenk
25936069ff26Swdenk   "Script files" are command sequences that will be executed by
25946069ff26Swdenk	U-Boot's command interpreter; this feature is especially
25956069ff26Swdenk	useful when you configure U-Boot to use a real shell (hush)
25966069ff26Swdenk	as command interpreter.
25976069ff26Swdenk
2598c609719bSwdenk
2599c609719bSwdenkStandalone HOWTO:
2600c609719bSwdenk=================
2601c609719bSwdenk
2602c609719bSwdenkOne of the features of U-Boot is that you can dynamically load and
2603c609719bSwdenkrun "standalone" applications, which can use some resources of
2604c609719bSwdenkU-Boot like console I/O functions or interrupt services.
2605c609719bSwdenk
2606c609719bSwdenkTwo simple examples are included with the sources:
2607c609719bSwdenk
2608c609719bSwdenk"Hello World" Demo:
2609c609719bSwdenk-------------------
2610c609719bSwdenk
2611c609719bSwdenk'examples/hello_world.c' contains a small "Hello World" Demo
2612c609719bSwdenkapplication; it is automatically compiled when you build U-Boot.
2613c609719bSwdenkIt's configured to run at address 0x00040004, so you can play with it
2614c609719bSwdenklike that:
2615c609719bSwdenk
2616c609719bSwdenk	=> loads
2617c609719bSwdenk	## Ready for S-Record download ...
2618c609719bSwdenk	~>examples/hello_world.srec
2619c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 ...
2620c609719bSwdenk	[file transfer complete]
2621c609719bSwdenk	[connected]
2622c609719bSwdenk	## Start Addr = 0x00040004
2623c609719bSwdenk
2624c609719bSwdenk	=> go 40004 Hello World! This is a test.
2625c609719bSwdenk	## Starting application at 0x00040004 ...
2626c609719bSwdenk	Hello World
2627c609719bSwdenk	argc = 7
2628c609719bSwdenk	argv[0] = "40004"
2629c609719bSwdenk	argv[1] = "Hello"
2630c609719bSwdenk	argv[2] = "World!"
2631c609719bSwdenk	argv[3] = "This"
2632c609719bSwdenk	argv[4] = "is"
2633c609719bSwdenk	argv[5] = "a"
2634c609719bSwdenk	argv[6] = "test."
2635c609719bSwdenk	argv[7] = "<NULL>"
2636c609719bSwdenk	Hit any key to exit ...
2637c609719bSwdenk
2638c609719bSwdenk	## Application terminated, rc = 0x0
2639c609719bSwdenk
2640c609719bSwdenkAnother example, which demonstrates how to register a CPM interrupt
2641c609719bSwdenkhandler with the U-Boot code, can be found in 'examples/timer.c'.
2642c609719bSwdenkHere, a CPM timer is set up to generate an interrupt every second.
2643c609719bSwdenkThe interrupt service routine is trivial, just printing a '.'
2644c609719bSwdenkcharacter, but this is just a demo program. The application can be
2645c609719bSwdenkcontrolled by the following keys:
2646c609719bSwdenk
2647c609719bSwdenk	? - print current values og the CPM Timer registers
2648c609719bSwdenk	b - enable interrupts and start timer
2649c609719bSwdenk	e - stop timer and disable interrupts
2650c609719bSwdenk	q - quit application
2651c609719bSwdenk
2652c609719bSwdenk	=> loads
2653c609719bSwdenk	## Ready for S-Record download ...
2654c609719bSwdenk	~>examples/timer.srec
2655c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 ...
2656c609719bSwdenk	[file transfer complete]
2657c609719bSwdenk	[connected]
2658c609719bSwdenk	## Start Addr = 0x00040004
2659c609719bSwdenk
2660c609719bSwdenk	=> go 40004
2661c609719bSwdenk	## Starting application at 0x00040004 ...
2662c609719bSwdenk	TIMERS=0xfff00980
2663c609719bSwdenk	Using timer 1
2664c609719bSwdenk	  tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0
2665c609719bSwdenk
2666c609719bSwdenkHit 'b':
2667c609719bSwdenk	[q, b, e, ?] Set interval 1000000 us
2668c609719bSwdenk	Enabling timer
2669c609719bSwdenkHit '?':
2670c609719bSwdenk	[q, b, e, ?] ........
2671c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0
2672c609719bSwdenkHit '?':
2673c609719bSwdenk	[q, b, e, ?] .
2674c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0
2675c609719bSwdenkHit '?':
2676c609719bSwdenk	[q, b, e, ?] .
2677c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0
2678c609719bSwdenkHit '?':
2679c609719bSwdenk	[q, b, e, ?] .
2680c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0
2681c609719bSwdenkHit 'e':
2682c609719bSwdenk	[q, b, e, ?] ...Stopping timer
2683c609719bSwdenkHit 'q':
2684c609719bSwdenk	[q, b, e, ?] ## Application terminated, rc = 0x0
2685c609719bSwdenk
2686c609719bSwdenk
268785ec0bccSwdenkMinicom warning:
268885ec0bccSwdenk================
268985ec0bccSwdenk
269085ec0bccSwdenkOver time, many people have reported problems when trying to used the
269185ec0bccSwdenk"minicom" terminal emulation program for serial download. I (wd)
269285ec0bccSwdenkconsider minicom to be broken, and recommend not to use it. Under
2693f07771ccSwdenkUnix, I recommend to use C-Kermit for general purpose use (and
269485ec0bccSwdenkespecially for kermit binary protocol download ("loadb" command), and
269585ec0bccSwdenkuse "cu" for S-Record download ("loads" command).
269685ec0bccSwdenk
269752f52c14SwdenkNevertheless, if you absolutely want to use it try adding this
269852f52c14Swdenkconfiguration to your "File transfer protocols" section:
269952f52c14Swdenk
270052f52c14Swdenk	   Name    Program                      Name U/D FullScr IO-Red. Multi
270152f52c14Swdenk	X  kermit  /usr/bin/kermit -i -l %l -s   Y    U    Y       N      N
270252f52c14Swdenk	Y  kermit  /usr/bin/kermit -i -l %l -r   N    D    Y       N      N
270352f52c14Swdenk
270452f52c14Swdenk
2705c609719bSwdenkNetBSD Notes:
2706c609719bSwdenk=============
2707c609719bSwdenk
2708c609719bSwdenkStarting at version 0.9.2, U-Boot supports NetBSD both as host
2709c609719bSwdenk(build U-Boot) and target system (boots NetBSD/mpc8xx).
2710c609719bSwdenk
2711c609719bSwdenkBuilding requires a cross environment; it is known to work on
2712c609719bSwdenkNetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also
2713c609719bSwdenkneed gmake since the Makefiles are not compatible with BSD make).
2714c609719bSwdenkNote that the cross-powerpc package does not install include files;
2715c609719bSwdenkattempting to build U-Boot will fail because <machine/ansi.h> is
2716c609719bSwdenkmissing.  This file has to be installed and patched manually:
2717c609719bSwdenk
2718c609719bSwdenk	# cd /usr/pkg/cross/powerpc-netbsd/include
2719c609719bSwdenk	# mkdir powerpc
2720c609719bSwdenk	# ln -s powerpc machine
2721c609719bSwdenk	# cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h
2722c609719bSwdenk	# ${EDIT} powerpc/ansi.h	## must remove __va_list, _BSD_VA_LIST
2723c609719bSwdenk
2724c609719bSwdenkNative builds *don't* work due to incompatibilities between native
2725c609719bSwdenkand U-Boot include files.
2726c609719bSwdenk
2727c609719bSwdenkBooting assumes that (the first part of) the image booted is a
2728c609719bSwdenkstage-2 loader which in turn loads and then invokes the kernel
2729c609719bSwdenkproper. Loader sources will eventually appear in the NetBSD source
2730c609719bSwdenktree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the
2731c609719bSwdenkmeantime, send mail to bruno@exet-ag.de and/or wd@denx.de for
2732c609719bSwdenkdetails.
2733c609719bSwdenk
2734c609719bSwdenk
2735c609719bSwdenkImplementation Internals:
2736c609719bSwdenk=========================
2737c609719bSwdenk
2738c609719bSwdenkThe following is not intended to be a complete description of every
2739c609719bSwdenkimplementation detail. However, it should help to understand the
2740c609719bSwdenkinner workings of U-Boot and make it easier to port it to custom
2741c609719bSwdenkhardware.
2742c609719bSwdenk
2743c609719bSwdenk
2744c609719bSwdenkInitial Stack, Global Data:
2745c609719bSwdenk---------------------------
2746c609719bSwdenk
2747c609719bSwdenkThe implementation of U-Boot is complicated by the fact that U-Boot
2748c609719bSwdenkstarts running out of ROM (flash memory), usually without access to
2749c609719bSwdenksystem RAM (because the memory controller is not initialized yet).
2750c609719bSwdenkThis means that we don't have writable Data or BSS segments, and BSS
2751c609719bSwdenkis not initialized as zero. To be able to get a C environment working
2752c609719bSwdenkat all, we have to allocate at least a minimal stack. Implementation
2753c609719bSwdenkoptions for this are defined and restricted by the CPU used: Some CPU
2754c609719bSwdenkmodels provide on-chip memory (like the IMMR area on MPC8xx and
2755c609719bSwdenkMPC826x processors), on others (parts of) the data cache can be
2756c609719bSwdenklocked as (mis-) used as memory, etc.
2757c609719bSwdenk
275843d9616cSwdenk	Chris Hallinan posted a good summy of  these  issues  to  the
275943d9616cSwdenk	u-boot-users mailing list:
276043d9616cSwdenk
276143d9616cSwdenk	Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)?
276243d9616cSwdenk	From: "Chris Hallinan" <clh@net1plus.com>
276343d9616cSwdenk	Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET)
276443d9616cSwdenk	...
276543d9616cSwdenk
276643d9616cSwdenk	Correct me if I'm wrong, folks, but the way I understand it
276743d9616cSwdenk	is this: Using DCACHE as initial RAM for Stack, etc, does not
276843d9616cSwdenk	require any physical RAM backing up the cache. The cleverness
276943d9616cSwdenk	is that the cache is being used as a temporary supply of
277043d9616cSwdenk	necessary storage before the SDRAM controller is setup. It's
277143d9616cSwdenk	beyond the scope of this list to expain the details, but you
277243d9616cSwdenk	can see how this works by studying the cache architecture and
277343d9616cSwdenk	operation in the architecture and processor-specific manuals.
277443d9616cSwdenk
277543d9616cSwdenk	OCM is On Chip Memory, which I believe the 405GP has 4K. It
277643d9616cSwdenk	is another option for the system designer to use as an
277743d9616cSwdenk	initial stack/ram area prior to SDRAM being available. Either
277843d9616cSwdenk	option should work for you. Using CS 4 should be fine if your
277943d9616cSwdenk	board designers haven't used it for something that would
278043d9616cSwdenk	cause you grief during the initial boot! It is frequently not
278143d9616cSwdenk	used.
278243d9616cSwdenk
278343d9616cSwdenk	CFG_INIT_RAM_ADDR should be somewhere that won't interfere
278443d9616cSwdenk	with your processor/board/system design. The default value
278543d9616cSwdenk	you will find in any recent u-boot distribution in
278643d9616cSwdenk	Walnut405.h should work for you. I'd set it to a value larger
278743d9616cSwdenk	than your SDRAM module. If you have a 64MB SDRAM module, set
278843d9616cSwdenk	it above 400_0000. Just make sure your board has no resources
278943d9616cSwdenk	that are supposed to respond to that address! That code in
279043d9616cSwdenk	start.S has been around a while and should work as is when
279143d9616cSwdenk	you get the config right.
279243d9616cSwdenk
279343d9616cSwdenk	-Chris Hallinan
279443d9616cSwdenk	DS4.COM, Inc.
279543d9616cSwdenk
2796c609719bSwdenkIt is essential to remember this, since it has some impact on the C
2797c609719bSwdenkcode for the initialization procedures:
2798c609719bSwdenk
2799c609719bSwdenk* Initialized global data (data segment) is read-only. Do not attempt
2800c609719bSwdenk  to write it.
2801c609719bSwdenk
2802c609719bSwdenk* Do not use any unitialized global data (or implicitely initialized
2803c609719bSwdenk  as zero data - BSS segment) at all - this is undefined, initiali-
2804c609719bSwdenk  zation is performed later (when relocationg to RAM).
2805c609719bSwdenk
2806c609719bSwdenk* Stack space is very limited. Avoid big data buffers or things  like
2807c609719bSwdenk  that.
2808c609719bSwdenk
2809c609719bSwdenkHaving only the stack as writable memory limits means we cannot use
2810c609719bSwdenknormal global data to share information beween the code. But it
2811c609719bSwdenkturned out that the implementation of U-Boot can be greatly
2812c609719bSwdenksimplified by making a global data structure (gd_t) available to all
2813c609719bSwdenkfunctions. We could pass a pointer to this data as argument to _all_
2814c609719bSwdenkfunctions, but this would bloat the code. Instead we use a feature of
2815c609719bSwdenkthe GCC compiler (Global Register Variables) to share the data: we
2816c609719bSwdenkplace a pointer (gd) to the global data into a register which we
2817c609719bSwdenkreserve for this purpose.
2818c609719bSwdenk
2819c609719bSwdenkWhen chosing a register for such a purpose we are restricted  by  the
2820c609719bSwdenkrelevant  (E)ABI  specifications for the current architecture, and by
2821c609719bSwdenkGCC's implementation.
2822c609719bSwdenk
2823c609719bSwdenkFor PowerPC, the following registers have specific use:
2824c609719bSwdenk	R1:	stack pointer
2825c609719bSwdenk	R2:	TOC pointer
2826c609719bSwdenk	R3-R4:	parameter passing and return values
2827c609719bSwdenk	R5-R10:	parameter passing
2828c609719bSwdenk	R13:	small data area pointer
2829c609719bSwdenk	R30:	GOT pointer
2830c609719bSwdenk	R31:	frame pointer
2831c609719bSwdenk
2832c609719bSwdenk	(U-Boot also uses R14 as internal GOT pointer.)
2833c609719bSwdenk
2834c609719bSwdenk    ==> U-Boot will use R29 to hold a pointer to the global data
2835c609719bSwdenk
2836c609719bSwdenk    Note: on PPC, we could use a static initializer (since the
2837c609719bSwdenk    address of the global data structure is known at compile time),
2838c609719bSwdenk    but it turned out that reserving a register results in somewhat
2839c609719bSwdenk    smaller code - although the code savings are not that big (on
2840c609719bSwdenk    average for all boards 752 bytes for the whole U-Boot image,
2841c609719bSwdenk    624 text + 127 data).
2842c609719bSwdenk
2843c609719bSwdenkOn ARM, the following registers are used:
2844c609719bSwdenk
2845c609719bSwdenk	R0:	function argument word/integer result
2846c609719bSwdenk	R1-R3:	function argument word
2847c609719bSwdenk	R9:	GOT pointer
2848c609719bSwdenk	R10:	stack limit (used only if stack checking if enabled)
2849c609719bSwdenk	R11:	argument (frame) pointer
2850c609719bSwdenk	R12:	temporary workspace
2851c609719bSwdenk	R13:	stack pointer
2852c609719bSwdenk	R14:	link register
2853c609719bSwdenk	R15:	program counter
2854c609719bSwdenk
2855c609719bSwdenk    ==> U-Boot will use R8 to hold a pointer to the global data
2856c609719bSwdenk
2857c609719bSwdenk
2858c609719bSwdenkMemory Management:
2859c609719bSwdenk------------------
2860c609719bSwdenk
2861c609719bSwdenkU-Boot runs in system state and uses physical addresses, i.e. the
2862c609719bSwdenkMMU is not used either for address mapping nor for memory protection.
2863c609719bSwdenk
2864c609719bSwdenkThe available memory is mapped to fixed addresses using the memory
2865c609719bSwdenkcontroller. In this process, a contiguous block is formed for each
2866c609719bSwdenkmemory type (Flash, SDRAM, SRAM), even when it consists of several
2867c609719bSwdenkphysical memory banks.
2868c609719bSwdenk
2869c609719bSwdenkU-Boot is installed in the first 128 kB of the first Flash bank (on
2870c609719bSwdenkTQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After
2871c609719bSwdenkbooting and sizing and initializing DRAM, the code relocates itself
2872c609719bSwdenkto the upper end of DRAM. Immediately below the U-Boot code some
2873c609719bSwdenkmemory is reserved for use by malloc() [see CFG_MALLOC_LEN
2874c609719bSwdenkconfiguration setting]. Below that, a structure with global Board
2875c609719bSwdenkInfo data is placed, followed by the stack (growing downward).
2876c609719bSwdenk
2877c609719bSwdenkAdditionally, some exception handler code is copied to the low 8 kB
2878c609719bSwdenkof DRAM (0x00000000 ... 0x00001FFF).
2879c609719bSwdenk
2880c609719bSwdenkSo a typical memory configuration with 16 MB of DRAM could look like
2881c609719bSwdenkthis:
2882c609719bSwdenk
2883c609719bSwdenk	0x0000 0000	Exception Vector code
2884c609719bSwdenk	      :
2885c609719bSwdenk	0x0000 1FFF
2886c609719bSwdenk	0x0000 2000	Free for Application Use
2887c609719bSwdenk	      :
2888c609719bSwdenk	      :
2889c609719bSwdenk
2890c609719bSwdenk	      :
2891c609719bSwdenk	      :
2892c609719bSwdenk	0x00FB FF20	Monitor Stack (Growing downward)
2893c609719bSwdenk	0x00FB FFAC	Board Info Data and permanent copy of global data
2894c609719bSwdenk	0x00FC 0000	Malloc Arena
2895c609719bSwdenk	      :
2896c609719bSwdenk	0x00FD FFFF
2897c609719bSwdenk	0x00FE 0000	RAM Copy of Monitor Code
2898c609719bSwdenk	...		eventually: LCD or video framebuffer
2899c609719bSwdenk	...		eventually: pRAM (Protected RAM - unchanged by reset)
2900c609719bSwdenk	0x00FF FFFF	[End of RAM]
2901c609719bSwdenk
2902c609719bSwdenk
2903c609719bSwdenkSystem Initialization:
2904c609719bSwdenk----------------------
2905c609719bSwdenk
2906c609719bSwdenkIn the reset configuration, U-Boot starts at the reset entry point
2907c609719bSwdenk(on most PowerPC systens at address 0x00000100). Because of the reset
2908c609719bSwdenkconfiguration for CS0# this is a mirror of the onboard Flash memory.
2909c609719bSwdenkTo be able to re-map memory U-Boot then jumps to it's link address.
2910c609719bSwdenkTo be able to implement the initialization code in C, a (small!)
2911c609719bSwdenkinitial stack is set up in the internal Dual Ported RAM (in case CPUs
2912c609719bSwdenkwhich provide such a feature like MPC8xx or MPC8260), or in a locked
2913c609719bSwdenkpart of the data cache. After that, U-Boot initializes the CPU core,
2914c609719bSwdenkthe caches and the SIU.
2915c609719bSwdenk
2916c609719bSwdenkNext, all (potentially) available memory banks are mapped using a
2917c609719bSwdenkpreliminary mapping. For example, we put them on 512 MB boundaries
2918c609719bSwdenk(multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash
2919c609719bSwdenkon 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is
2920c609719bSwdenkprogrammed for SDRAM access. Using the temporary configuration, a
2921c609719bSwdenksimple memory test is run that determines the size of the SDRAM
2922c609719bSwdenkbanks.
2923c609719bSwdenk
2924c609719bSwdenkWhen there is more than one SDRAM bank, and the banks are of
2925c609719bSwdenkdifferent size, the larger is mapped first. For equal size, the first
2926c609719bSwdenkbank (CS2#) is mapped first. The first mapping is always for address
2927c609719bSwdenk0x00000000, with any additional banks following immediately to create
2928c609719bSwdenkcontiguous memory starting from 0.
2929c609719bSwdenk
2930c609719bSwdenkThen, the monitor installs itself at the upper end of the SDRAM area
2931c609719bSwdenkand allocates memory for use by malloc() and for the global Board
2932c609719bSwdenkInfo data; also, the exception vector code is copied to the low RAM
2933c609719bSwdenkpages, and the final stack is set up.
2934c609719bSwdenk
2935c609719bSwdenkOnly after this relocation will you have a "normal" C environment;
2936c609719bSwdenkuntil that you are restricted in several ways, mostly because you are
2937c609719bSwdenkrunning from ROM, and because the code will have to be relocated to a
2938c609719bSwdenknew address in RAM.
2939c609719bSwdenk
2940c609719bSwdenk
2941c609719bSwdenkU-Boot Porting Guide:
2942c609719bSwdenk----------------------
2943c609719bSwdenk
2944c609719bSwdenk[Based on messages by Jerry Van Baren in the U-Boot-Users mailing
29456aff3115Swdenklist, October 2002]
2946c609719bSwdenk
2947c609719bSwdenk
2948c609719bSwdenkint main (int argc, char *argv[])
2949c609719bSwdenk{
2950c609719bSwdenk	sighandler_t no_more_time;
2951c609719bSwdenk
2952c609719bSwdenk	signal (SIGALRM, no_more_time);
2953c609719bSwdenk	alarm (PROJECT_DEADLINE - toSec (3 * WEEK));
2954c609719bSwdenk
2955c609719bSwdenk	if (available_money > available_manpower) {
2956c609719bSwdenk		pay consultant to port U-Boot;
2957c609719bSwdenk		return 0;
2958c609719bSwdenk	}
2959c609719bSwdenk
2960c609719bSwdenk	Download latest U-Boot source;
2961c609719bSwdenk
29626aff3115Swdenk	Subscribe to u-boot-users mailing list;
29636aff3115Swdenk
2964c609719bSwdenk	if (clueless) {
2965c609719bSwdenk		email ("Hi, I am new to U-Boot, how do I get started?");
2966c609719bSwdenk	}
2967c609719bSwdenk
2968c609719bSwdenk	while (learning) {
2969c609719bSwdenk		Read the README file in the top level directory;
2970c609719bSwdenk		Read http://www.denx.de/re/DPLG.html
2971c609719bSwdenk		Read the source, Luke;
2972c609719bSwdenk	}
2973c609719bSwdenk
2974c609719bSwdenk	if (available_money > toLocalCurrency ($2500)) {
2975c609719bSwdenk		Buy a BDI2000;
2976c609719bSwdenk	} else {
2977c609719bSwdenk		Add a lot of aggravation and time;
2978c609719bSwdenk	}
2979c609719bSwdenk
2980c609719bSwdenk	Create your own board support subdirectory;
2981c609719bSwdenk
29826aff3115Swdenk	Create your own board config file;
29836aff3115Swdenk
2984c609719bSwdenk	while (!running) {
2985c609719bSwdenk		do {
2986c609719bSwdenk			Add / modify source code;
2987c609719bSwdenk		} until (compiles);
2988c609719bSwdenk		Debug;
2989c609719bSwdenk		if (clueless)
2990c609719bSwdenk			email ("Hi, I am having problems...");
2991c609719bSwdenk	}
2992c609719bSwdenk	Send patch file to Wolfgang;
2993c609719bSwdenk
2994c609719bSwdenk	return 0;
2995c609719bSwdenk}
2996c609719bSwdenk
2997c609719bSwdenkvoid no_more_time (int sig)
2998c609719bSwdenk{
2999c609719bSwdenk      hire_a_guru();
3000c609719bSwdenk}
3001c609719bSwdenk
3002c609719bSwdenk
3003c609719bSwdenkCoding Standards:
3004c609719bSwdenk-----------------
3005c609719bSwdenk
3006c609719bSwdenkAll contributions to U-Boot should conform to the Linux kernel
3007c609719bSwdenkcoding style; see the file "Documentation/CodingStyle" in your Linux
3008c609719bSwdenkkernel source directory.
3009c609719bSwdenk
3010c609719bSwdenkPlease note that U-Boot is implemented in C (and to some small parts
3011c609719bSwdenkin Assembler); no C++ is used, so please do not use C++ style
3012c609719bSwdenkcomments (//) in your code.
3013c609719bSwdenk
3014c609719bSwdenkSubmissions which do not conform to the standards may be returned
3015c609719bSwdenkwith a request to reformat the changes.
3016c609719bSwdenk
3017c609719bSwdenk
3018c609719bSwdenkSubmitting Patches:
3019c609719bSwdenk-------------------
3020c609719bSwdenk
3021c609719bSwdenkSince the number of patches for U-Boot is growing, we need to
3022c609719bSwdenkestablish some rules. Submissions which do not conform to these rules
3023c609719bSwdenkmay be rejected, even when they contain important and valuable stuff.
3024c609719bSwdenk
3025c609719bSwdenk
3026c609719bSwdenkWhen you send a patch, please include the following information with
3027c609719bSwdenkit:
3028c609719bSwdenk
3029c609719bSwdenk* For bug fixes: a description of the bug and how your patch fixes
3030c609719bSwdenk  this bug. Please try to include a way of demonstrating that the
3031c609719bSwdenk  patch actually fixes something.
3032c609719bSwdenk
3033c609719bSwdenk* For new features: a description of the feature and your
3034c609719bSwdenk  implementation.
3035c609719bSwdenk
3036c609719bSwdenk* A CHANGELOG entry as plaintext (separate from the patch)
3037c609719bSwdenk
3038c609719bSwdenk* For major contributions, your entry to the CREDITS file
3039c609719bSwdenk
3040c609719bSwdenk* When you add support for a new board, don't forget to add this
3041c609719bSwdenk  board to the MAKEALL script, too.
3042c609719bSwdenk
3043c609719bSwdenk* If your patch adds new configuration options, don't forget to
3044c609719bSwdenk  document these in the README file.
3045c609719bSwdenk
3046c609719bSwdenk* The patch itself. If you are accessing the CVS repository use "cvs
3047c609719bSwdenk  update; cvs diff -puRN"; else, use "diff -purN OLD NEW". If your
3048c609719bSwdenk  version of diff does not support these options, then get the latest
3049c609719bSwdenk  version of GNU diff.
3050c609719bSwdenk
3051c609719bSwdenk  We accept patches as plain text, MIME attachments or as uuencoded
3052c609719bSwdenk  gzipped text.
3053c609719bSwdenk
305452f52c14Swdenk* If one logical set of modifications affects or creates several
305552f52c14Swdenk  files, all these changes shall be submitted in a SINGLE patch file.
305652f52c14Swdenk
305752f52c14Swdenk* Changesets that contain different, unrelated modifications shall be
305852f52c14Swdenk  submitted as SEPARATE patches, one patch per changeset.
305952f52c14Swdenk
306052f52c14Swdenk
3061c609719bSwdenkNotes:
3062c609719bSwdenk
3063c609719bSwdenk* Before sending the patch, run the MAKEALL script on your patched
3064c609719bSwdenk  source tree and make sure that no errors or warnings are reported
3065c609719bSwdenk  for any of the boards.
3066c609719bSwdenk
3067c609719bSwdenk* Keep your modifications to the necessary minimum: A patch
3068c609719bSwdenk  containing several unrelated changes or arbitrary reformats will be
3069c609719bSwdenk  returned with a request to re-formatting / split it.
3070c609719bSwdenk
3071c609719bSwdenk* If you modify existing code, make sure that your new code does not
3072c609719bSwdenk  add to the memory footprint of the code ;-) Small is beautiful!
3073c609719bSwdenk  When adding new features, these should compile conditionally only
3074c609719bSwdenk  (using #ifdef), and the resulting code with the new feature
3075c609719bSwdenk  disabled must not need more memory than the old code without your
3076c609719bSwdenk  modification.
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