[coreboot] Crazy Intel graphics mtrr
yinghailu at gmail.com
Thu Apr 17 04:08:00 CEST 2008
On Wed, Apr 16, 2008 at 5:03 PM, <joe at settoplinux.org> wrote:
> I am noticing some X problems (slow, crashes once and a while) on the RCA RM4100. I think this is related to the crazy way coreboot setup the mtrr. For some reason when the Intel onboard graphics are enabled, coreboot sets up this crazy looking mtrr. I don't think they should all be write-back? Isn't write-combining faster for graphics? Does it need to have a uncachable area?
that is normal.
> reg00: base=0x00000000 ( 0MB), size= 64MB: write-back, count=1
> reg01: base=0x04000000 ( 64MB), size= 32MB: write-back, count=1
> reg02: base=0x06000000 ( 96MB), size= 16MB: write-back, count=1
> reg03: base=0x07000000 ( 112MB), size= 8MB: write-back, count=1
> reg00: base=0x07800000 ( 120MB), size= 8MB: uncachable, count=1
> reg01: base=0x00000000 ( 0MB), size= 128MB: write-back, count=1
and old kernel like previous one
64+32+16+8 == (128 - 8)
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