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xen-bugs
[Xen-bugs] [Bug 821] New: Can not change mtrr registers
http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=821
Summary: Can not change mtrr registers
Product: Xen
Version: unstable
Platform: x86
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Unspecified
AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
ReportedBy: fhuberts@xxxxxxxxx
I have a Fedora Core 6 system with 4GB RAM and an ATI gfx card. For the gfx
card to work optimally it needs write-combining.
My BIOS doesn't set up the write-combining so I have to do it myself (I think
no BIOS does setup this).
With a PAE kernel I can adjust the mtrr settings just fine, but xen does not
allow me to do this. When I try to disable an entry or add an entry then the
shell responds with an 'echo' error.
xen release is 3.0.3-rc5-1.2849.f
kernel is 2.6.18-1.2849.fc6xen
I have an asus p5w mb and use the memory remapping bios setting: 2GB from 0GB
and 2GB from 4GB (PAE mode). The 2GB from 2GB are uncacheable, and the region
d0-e0 needs to be write-combing.
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