[coreboot] Crazy Intel graphics mtrr

[Joe]

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