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

[Tim Gardner]

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.
> 
> 
> 
> 

Applied

https://bugs.edge.launchpad.net/ubuntu/+source/linux/+bug/292619/comments/9
-- 
Tim Gardner tim.gardner at canonical.com