linux-kernel - Re: [PATCH] x86-64: disable the GART before allocate aperture

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Date:	Fri, 22 Jun 2007 12:38:16 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Muli Ben-Yehuda" <muli@...ibm.com>
Cc:	"Andi Kleen" <ak@...e.de>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Vivek Goyal" <vgoyal@...ibm.com>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86-64: disable the GART before allocate aperture

On 6/22/07, Muli Ben-Yehuda <muli@...ibm.com> wrote:
> On Fri, Jun 22, 2007 at 12:19:15PM -0700, Yinghai Lu wrote:
> > [PATCH] x86-64: disable the GART before allocate aperture
> >
> > For K8 system: 4G RAM with memory hole remapping enabled, or more
> > than 4G RAM installed. when mem is allocated for GART, it will do
> > the memset for clear.  and for kexec case, the first kernel already
> > enable that, the memset in second kernel will cause the system
> > restart. So disable that at first before we try to allocate mem for
> > it.
>
> Why does the memset in the second kernel cause a system restart?

the mem for aperture is still used by GART. or the translation is still enabled.

YH
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