Date: Fri, 22 Jun 2007 12:49:35 -0700
From: Yinghai Lu <Yinghai.Lu@Sun.COM>
Subject: Re: [PATCH] x86-64: disable the GART before allocate aperture
In-reply-to: <20070622193124.GG5051@rhun.smartcity.com>
To: Muli Ben-Yehuda <muli@il.ibm.com>
Cc: Andi Kleen <ak@suse.de>, Andrew Morton <akpm@linux-foundation.org>,
       "Eric W. Biederman" <ebiederm@xmission.com>,
       Vivek Goyal <vgoyal@in.ibm.com>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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Muli Ben-Yehuda 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?
> 
GART is enabled by first kernel, and some driver is using that for DMA.

YH
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