[coreboot] Crazy Intel graphics mtrr
Joe
joe at settoplinux.org
Tue Apr 22 00:06:14 CEST 2008
Hey did anyone know you can adjust your mtrr in Linux?
I did not know that:-)
Check out this link:
http://www.meduna.org/txt_mtrr_en.html
Thanks,
Joseph Smith
Set-Top-Linux
www.settoplinux.org
> -----Original Message-----
> From: yhlu [mailto:yinghailu at gmail.com]
> Sent: Wednesday, April 16, 2008 10:08 PM
> To: joe at settoplinux.org
> Cc: coreboot at coreboot.org
> Subject: Re: [coreboot] Crazy Intel graphics mtrr
>
> On Wed, Apr 16, 2008 at 5:03 PM, <joe at settoplinux.org> wrote:
> > Hello,
> > 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)
>
> YH
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