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

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Message-ID: <20070622193124.GG5051@rhun.smartcity.com>
Date:	Fri, 22 Jun 2007 12:31:24 -0700
From:	Muli Ben-Yehuda <muli@...ibm.com>
To:	Yinghai Lu <Yinghai.Lu@....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 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?

Cheers,
Muli
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