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

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Message-ID: <20090317094332.GE6477@elte.hu>
Date:	Tue, 17 Mar 2009 10:43:32 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Ozan Çağlayan <ozan@...dus.org.tr>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [BUG 2.6.29_rc8] BIOS Bug: CPU MTRRs don't cover all of
	memory, losing 0MB of RAM.


* Yinghai Lu <yinghai@...nel.org> 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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