Messages in this thread | | | Subject | Re: question about MTRR areas on x86_64 | From | (Eric W. Biederman) | Date | 14 Oct 2004 04:49:16 -0600 |
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Andi Kleen <ak@muc.de> writes:
> Markus Lidel <Markus.Lidel@shadowconnect.com> writes: > > > > Could it be because the machine has too much memory, or is there a bug in the > I2O driver? > > > The problem comes from the BIOS who set up reg00 to be overlapping > over other areas. The Linux MTRR driver cannot deal with overlapping > MTRRs, in fact it is sometimes impossible because it could run > out of registers or violate some of the MTRR restrictions.
And the BIOS is using overlapping MTRRs because otherwise it would run out.
> It's a long standing problem, eventual fix will be to get rid > of MTRRs completely and only use PAT. But it needs a bit more work.
That would be nice to see.
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