Re: MTRR & NVTNT
Jeremy Fitzhardinge (jeremy@goop.org)
Fri, 12 Mar 1999 11:25:41 -0800 (PST)
On 11-Mar-99 Scott Lampert wrote:
> Doh! You're right of course. Setting it to size (0x1000000) worked
> fine. That leads me to another two questions if you have the time:
>
> My X server has this line for video ram:
>
> (--) SVGA: PCI: NVidia Riva TNT rev 4, Memory @ 0xe4000000, 0xe6000000
>
> Does this mean I should have two 8 meg MTRR entries at those base
> addresses or just ignore the first one?
Don't set an mtrr for the memory at 0xe4000000 - its marked un-prefetchable,
which means its probably IO registers or something. The last thing the
hardware needs is the CPU rearranging its instructions.
J
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