[PATCH 0/1] UBUNTU: SAUCE: x86: mtrr: don't modify RdDram/WrDram bits of fixed MTRRs

[Tim Gardner]

Stefan Bader wrote:
> Tim Gardner wrote:
>> TJ wrote:
>>> LP #292619 https://launchpad.net/bugs/292619
>>>
>>> This is a cherry-pick from x86-tip that should land for mainline
>>> 2.6.29.1. It resolves kernel panics during boot for SMP AMD CPU systems.
>>>
>>> The cause is the MTRRs for the boot CPU (BP) and additional CPUs (AP)
>>> being modified by Linux for fixed MTRRs - in part because BIOS doesn't
>>> clear SYSCFG[MtrrFixDramModEn].
>>>
>>> The affected systems boot only using acpi=ht, acpi=off or when the
>>> kernel is built with CONFIG_MTRR=n.
>>>
>>> I've cherry-picked the x86-tip commit 3ff42da5048649 from
>>>
>>> git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-tip.git
>>>
>>> It applies cleanly to Jaunty.
>>>
>>> LP #292619 reports this issue since 2.6.24-19-server so if the Jaunty
>>> patch solves the user's issue this patch would be a candidate for Hardy
>>> and Intrepid SRUs.
>>>
>>>
> 
> Tim, given positive feedback for Jaunty (or even now), can you create
> tasks for Intrepid and Hardy and assign the to me?
> 
> 
>>>
>>>
>>
>> Applied
>>
>> https://bugs.edge.launchpad.net/ubuntu/+source/linux/+bug/292619/comments/9
>>
> 
> 

It's your baby now.

-- 
Tim Gardner tim.gardner at canonical.com