mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-22 19:23:07 +00:00
8bde7f776c
- remove trailing white space, trailing empty lines, C++ comments, etc.
- split cmd_boot.c (separate cmd_bdinfo.c and cmd_load.c)
* Patches by Kenneth Johansson, 25 Jun 2003:
- major rework of command structure
(work done mostly by Michal Cendrowski and Joakim Kristiansen)
89 lines
2.7 KiB
Text
89 lines
2.7 KiB
Text
/*
|
|
* (C) Copyright 2000
|
|
* Dave Ellis, SIXNET, dge@sixnetio.com
|
|
*
|
|
* See file CREDITS for list of people who contributed to this
|
|
* project.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation; either version 2 of
|
|
* the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
|
|
* MA 02111-1307 USA
|
|
*/
|
|
|
|
Using the Motorola MPC8XXFADS development board
|
|
===============================================
|
|
|
|
CONFIGURATIONS
|
|
--------------
|
|
|
|
There are ready-to-use default configurations available for the
|
|
FADS823, FADS850SAR and FADS860T. The FADS860T configuration also
|
|
works for the 855T processor.
|
|
|
|
LOADING U-Boot INTO FADS FLASH MEMORY
|
|
--------------------------------------
|
|
|
|
MPC8BUG can load U-Boot into the FLASH memory using LOADF.
|
|
|
|
loadf u-boot.srec 100000
|
|
|
|
|
|
STARTING U-Boot FROM MPC8BUG
|
|
-----------------------------
|
|
|
|
To start U-Boot from MPC8BUG:
|
|
|
|
1. Reset the board:
|
|
reset :h
|
|
|
|
2. Change BR0 and OR0 back to their values at reset:
|
|
rms memc br0 00000001
|
|
rms memc or0 00000d34
|
|
|
|
3. Modify DER so MPC8BUG gets control only when it should:
|
|
rms der 2002000f
|
|
|
|
4. Start as if from reset:
|
|
go 100
|
|
|
|
This is NOT exactly the same as starting U-Boot without
|
|
MPC8BUG. MPC8BUG turns off the watchdog as part of the hard reset.
|
|
After it does the reset it writes SYPCR (to disable the watchdog)
|
|
and sets BR0 and OR0 to map the FLASH at 0x02800000 (and does lots
|
|
of other initialization). That is why it is necessary to set BR0
|
|
and OR0 to map the FLASH everywhere. U-Boot can't turn on the
|
|
watchdog after that, since MPC8BUG has used the only chance to write
|
|
to SYPCR.
|
|
|
|
Here is a bizarre sequence of MPC8BUG and U-Boot commands that lets
|
|
U-Boot write to SYPCR. It works with MPC8BUG 1.5 and an 855T
|
|
processor (your mileage may vary). It is probably better (and a lot
|
|
easier) just to accept having the watchdog disabled when the debug
|
|
cable is connected.
|
|
|
|
in MPC8BUG:
|
|
reset :h
|
|
rms memc br0 00000001
|
|
rms memc or0 00000d34
|
|
rms der 2000f
|
|
go 100
|
|
|
|
Now U-Boot is running with the MPC8BUG value for SYPCR. Use the
|
|
U-Boot 'reset' command to reset the board.
|
|
=>reset
|
|
Next, in MPC8BUG:
|
|
rms der 2000f
|
|
go
|
|
|
|
Now U-Boot is running with the U-Boot value for SYPCR.
|