Re: [BUG 2.6.29_rc8] BIOS Bug: CPU MTRRs don't cover all ofmemory, losing 0MB of RAM.

From: Ingo Molnar
Date: Tue Mar 17 2009 - 05:45:02 EST



* Yinghai Lu <yinghai@xxxxxxxxxx> wrote:

> > x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106
> > get_mtrr: cpu0 reg00 base=0000000000 size=0010000000 write-back
> > get_mtrr: cpu0 reg01 base=00000cff00 size=0000000100 uncachable
> > get_mtrr: cpu0 reg02 base=00000d0000 size=0000010000 uncachable
> > get_mtrr: cpu0 reg03 base=00000e0000 size=0000020000 uncachable
> > get_mtrr: cpu0 reg04 base=0000000004 size=0000000001 uncachable
> > get_mtrr: cpu0 reg05 base=0000000005 size=0000000001 uncachable
> > get_mtrr: cpu0 reg06 base=0000000006 size=0000000001 uncachable
> > get_mtrr: cpu0 reg07 base=0000000007 size=0000000001 uncachable
> > WARNING: BIOS bug: VAR MTRR contains strange UC entry under 1M, check with your system vendor!
> > WARNING: BIOS bug: VAR MTRR contains strange UC entry under 1M, check with your system vendor!
> > WARNING: BIOS bug: VAR MTRR contains strange UC entry under 1M, check with your system vendor!
> > WARNING: BIOS bug: VAR MTRR contains strange UC entry under 1M, check with your system vendor!
>
> you got four wrong entries

but it's unintuitive. That warning should specify which entry is
wrong, so that we dont get these pointless duplicated lines.

Ingo
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