[PATCH 2.6.12-rc2] Add flash mapping for Radstone PPC7D

[Chris Elston]

This patch adds MTD mapping support for the PPC7D.  Because of the potentially
large amount of SDRAM on this platform I have had to map each bank of flash
into kernel virtual address space on demand.  I've done this by providing my
own read/write/copy_from/copy_to functions which map the required bank and then
drop straight through to the standard inline versions.  This doesn't seem to
create a large performance hit, but I don't have any quantative results to back
that up.

Comments/criticisms on this technique and the rest of the patch would be much 
appreciated.

Thanks

Chris.

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