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Diffstat (limited to 'board/fads/README')
-rw-r--r-- | board/fads/README | 73 |
1 files changed, 0 insertions, 73 deletions
diff --git a/board/fads/README b/board/fads/README deleted file mode 100644 index 0873682..0000000 --- a/board/fads/README +++ /dev/null @@ -1,73 +0,0 @@ -/* - * (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. |