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SubjectRe: activating mttr on voodoo 3

>I seems that 'lspci -v' reports a 32MB pre-fetchable window of memory,
>not 16MB for the hardware.
>This is with a 3dfx Voodoo3 3000 AGP, kernel version 2.3.49.

I have the same board with the same kernel. For some reason the card
reports 32mb with lspci. I read once that this might have to do with
having the frame buffer console enabled (seems doubtful). In any case,
the card only has a 16mb frame buffer ; enabling a 16mb write combining
range starting at the prefetchable buffer start address is sufficient,
enabling 32mb will yield no improvement. And enabling write-combining on
the non-prefetchable range will have disastrous results.

Phil D.


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