Ok so here his a new stab a simplifying the MC setup. I am
pretty sure i didn't broke or change in fundamental way how
we setup MC. See that i left untouch the mc_vram_size tweak.
Difference is that now we try to place VRAM at the same address
as PCI aperture, which should be fine, we might want to relax
that on r6xx and after as they the most likely GPU to have
1G or more of VRAM (did anyone know of some X1xxx GPU with more
than 1G of VRAM ?)

Now once i am done with radeon & ttm change for unmappable
VRAM should be easy to enable just remove couple of VRAM
downsizing in r100.c & r600.c.

Sweet bonus this patch as a negative - vs + countline :)

Cheers,
Jerome


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