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Date: Thu, 10 Jan 2008 19:13:29 -0800
From: "Yinghai Lu" <yhlu.kernel@gmail.com>
To: "Christoph Lameter" <clameter@sgi.com>
Subject: Re: kexec fail
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
       LKML <linux-kernel@vger.kernel.org>
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On Jan 8, 2008 2:36 PM, Yinghai Lu <yhlu.kernel@gmail.com> wrote:
>
> On Jan 8, 2008 12:15 AM, Yinghai Lu <yhlu.kernel@gmail.com> wrote:
> >
> > On Jan 7, 2008 9:50 PM, Christoph Lameter <clameter@sgi.com> wrote:
> > > On Mon, 7 Jan 2008, Yinghai Lu wrote:
> > >
> > > > try to kexec 2.6.23 from RHEL 5.1, will get
> > > > Your BIOS doesn't leave a aperture memory hole
> > > > Please enable the IOMMU option in the BIOS setup
> > > > This costs you 64 MB of RAM ======> reboot
> > > >
> > > > but 2.6.24-rc7 kexec 2.6.24-rc7 is ok.
> > >
> > > BUG in 2.6.23 kexec?
> > >
> > >
> >
> > yeah, that is more worse. it will cause reboot.
> >
>
> change mem model from CONFIG_SPARSEMEM_MANUL to
> CONFIG_DISCONTIGMEM_MANUAL it will work.

find the cause. because two kernel has different addr for GART aper.
and second kernel will put vmemmap in the GART set by first kernel.

http://lkml.org/lkml/2008/1/10/517

YH