[coreboot] [PATCH] Fix UMA memory range in RS780/RS785G

[Rudolf Marek]

Hello,

Attached patches fixes a video BIOS freeze with 128MB UMA. It looks like the 
internal address 0xc0000000 - 0xcfffffff was hardcoded. The change just takes
the fb size to account resulting in - 0xc7ffffff for 128MB UMA.

Signed-off-by: Rudolf Marek <r.marek at assembler.cz>

Yes it took some hours to find this out...

Thanks,
Rudolf
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