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xen-devel
Re: [Xen-devel] [PATCH] Check AMD SYSCFG DramModEn bit for MTRR configur
It is indeed very rare. But such bug, whenever it happens, is very hard
to spot. Linux kernel forces this bit to clear when read fixed MTRR. I
think we should at least print out a warning message.
-Wei
On Wed, 2011-03-02 at 09:20 -0600, Anish Patel wrote:
> Buggy BIOSes are more common than you think. especially from small
> shops, and some times they don't tend to release BIOS updates for their
> platforms.
>
>
>
> On 03/02/11 02:01, Keir Fraser wrote:
> > On 01/03/2011 21:11, "Wei Huang"<wei.huang2@xxxxxxx> wrote:
> >
> >> This patch checks whether SYSCFG DramModEn bit is clear by BIOS. Some
> >> buggy BIOS might set this bit to 1, which causes unexpected behavior on
> >> AMD platforms. This patch also increase family check for AMD CPUs when
> >> setting fixed MTRR ranges.
> > How common are these buggy BIOSes? Can't we just get users to update their
> > BIOS?
> >
> > -- Keir
> >
> >> Signed-off-by: Wei Huang<wei.huang2@xxxxxxx>
> >>
> >>
> >> PS: If OK, please apply it to both xen-4.1 and xen-4.0 trees.
> >>
> >> _______________________________________________
> >> Xen-devel mailing list
> >> Xen-devel@xxxxxxxxxxxxxxxxxxx
> >> http://lists.xensource.com/xen-devel
> >
> >
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-devel
> >
>
>
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