Re: 2.6.12?

[Andi Kleen <ak@muc.de>]

On Wed, Jun 08, 2005 at 04:04:56PM -0700, Martin J. Bligh wrote:
> >>> > >>> The one that worries me is that my x86_64 box won't boot since -rc3
> >>> > >>>  See:
> >>> > >>> 
> >>> > >>>  http://ftp.kernel.org/pub/linux/kernel/people/mbligh/abat/regression_matrix.html
> >>> > 
> >>> > HA. Found it. binary search reveals it's patch 182 out of 2.6.12-rc2-mm2.
> >>> > And the winner is .... <drum roll please> ....
> >>> > 
> >>> > x86_64-use-the-e820-hole-to-map-the-iommu-agp-aperture.patch
> >>> > 
> >>> 
> >>> hrm.  No useful messages in dmesg?
> >>> 
> >>> Andi, do we revert it?
> >> 
> >> Ok. For now. 
> >> 
> >> Actually it fixes some other bugs (e.g. one from Matt D.), but they are not
> >> very high priority.
> >> 
> >> I would like to debug it, but I am not sure I will still make it this week.
> >> But Martin, can you please send me the dmesg again? Maybe it is something
> >> stupid.
> > 
> > All the logs are linked off here:
> > 
> > http://ftp.kernel.org/pub/linux/kernel/people/mbligh/abat/regression_matrix.html
> > 
> > Just click on the ABORT messages in hte left column. But I'm thinking maybe
> > I'm off by one, and it might be:
> 
> Nope, I was correct, just one of my scrawled notes was wrong. backing out
> 
> x86_64-use-the-e820-hole-to-map-the-iommu-agp-aperture.patch
> 
> does indeed fix it.

Most likely it is a BIOS bug and the Newisys BIOS puts something in 
the hole when it should be marked RESERVED in e820. Little we can do 
here :/

Note in theory it could blow up on i386 too if you have enough
mappings. 
-Andi