[U-Boot-Users] [patch] add-support-for-high-boot-on-tqm5200-and-tqm5200s-boards

[Martin Krause]

Add support for high boot on TQM5200 and TQM5200S boards.

The high boot U-Boot could be used as a backup or rescue option if
something goes wrong during an (low boot) U-Boot update. For this a
secondary copy of U-Boot is stored at the end of the flash memory. 
Over jumper X30 on the STK52xx the desired boot option (low boot or 
high boot) could be selected.

Hint: the CPLD on the TQM5200 must be programmed with a software 
version supporting the high boot option!

U-Boot configurations for high boot:

- TQM5200_HIGHBOOT_config
- TQM5200_B_HIGHBOOT_config (for TQM5200S and TQM5200 with MPC5200B CPU)

The "high boot" U-Boot should be programmed to the beginning of the last
megabyte in flash memory (this addrss depends on the overall flash memory
of the used TQM5200 variant).

To actually "high boot", set jumper X30 on the STK52xx.

Both U-Boot versions (low boot and high boot) are using the same
environment stored in flash at address 0xFC080000.

Signed-off-by: Martin Krause <martin.krause at tqs.de>


CHANGELOG

* Add support for high boot on TQM5200 and TQM5200S boards.
  Patch by Martin Krause, 7 Jul 2006
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