Re: mtrr registers with >= 4GB ram

[Yinghai Lu]

On Wed, Jul 2, 2008 at 7:55 AM, Rann Bar-On <rb6@xxxxxxxx> wrote:
> As documented at https://bugs.launchpad.net/linux/+bug/210780 and
> http://www.rage3d.com/board/showthread.php?t=33821469 (as well as other
> places - google 4gb mtrr bug), the kernel appears to misdetect the mtrr
> registers on many machines with 4gb ram, causing all sorts of issues -
> especially with video drivers in X.  It is possible to rewrite the correct
> registers using a pretty hackish script, but the bug should probably be
> fixed at the kernel level.
>
> Please CC me personally when replying, as I'm not on LKML.  I'd be happy to
> try out patches if such come along :)

please try tip/master
http://people.redhat.com/mingo/tip.git/readme.txt

we have some patches there ...
      x86: mtrr cleanup for converting continuous to discrete layout, v8
      x86: mtrr cleanup for converting continuous to discrete layout v8 - fix
      x86: mtrr cleanup for converting continuous to discrete - auto detect v4
      x86: mtrr cleanup for converting continuous to discrete layout - fix #2

YH
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