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authorStefano Babic <sbabic@denx.de>2014-07-16 08:51:30 +0200
committerStefano Babic <sbabic@denx.de>2014-07-16 08:51:30 +0200
commitdab5e3469d294a4e1ffed8407d296a78e02cc01f (patch)
treec6378034591210b3142ca3add806d52c6ea22b3b /board/fads/README
parent14a1613140519a8d0a88e6054c302a8cb3e067a5 (diff)
parent524123a70761110c5cf3ccc5f52f6d4da071b959 (diff)
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Merge branch 'master' of git://git.denx.de/u-boot
Signed-off-by: Stefano Babic <sbabic@denx.de> Conflicts: boards.cfg
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-/*
- * (C) Copyright 2000
- * Dave Ellis, SIXNET, dge@sixnetio.com
- *
- * SPDX-License-Identifier: GPL-2.0+
- */
-
-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.