linux-kernel - Re: [PATCH] x86: mtrr: don't modify RdDram/WrDram bits of fixed MTRRs

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Message-ID: <20090312125352.GG20716@alberich.amd.com>
Date:	Thu, 12 Mar 2009 13:53:52 +0100
From:	Andreas Herrmann <andreas.herrmann3@....com>
To:	Maxim Levitsky <maximlevitsky@...il.com>
CC:	Yinghai Lu <yinghai@...nel.org>, Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
	trenn@...e.de
Subject: Re: [PATCH] x86: mtrr: don't modify RdDram/WrDram bits of fixed
	MTRRs

On Thu, Mar 12, 2009 at 02:29:02PM +0200, Maxim Levitsky wrote:
> On Thu, 2009-03-12 at 12:41 +0100, Andreas Herrmann wrote:
> >  (Causing Suspend/resume problem:)
> > - Acer Ferrari 1000
> > - Acer Ferrari 5000

> What problem?
> Hang second resume???

See

  http://lkml.org/lkml/2007/4/3/110

I don't have access to such a machine. Thus I don't know
what the exact problem was.

But it was the reason that the code to sync RdMem/WrMem bits of
fixed-MTRRs on AMD-CPUs was added. And now this caused new problems on
systems with other buggy BIOSes.


Regards,

Andreas

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