Can't boot a rawhide kernel since Jan. 13 or so? Read this.

[Paul W. Frields]

On Fri, Jan 23, 2009 at 12:59:34PM -0500, Will Woods wrote:
> If you have an x86 machine that can't boot a rawhide kernel after
> kernel-2.6.29-0.35.rc1.git4.fc11 (Jan. 13), you may have a buggy BIOS
> that can't handle the CONFIG_DMAR kernel option.
> 
> This kernel option was enabled in Rawhide during May 2008 but caused a
> lot of machines with buggy BIOSes to lock up at boot, so it was disabled
> on May 22 2008.
> 
> Support has since improved, and it's required for the KVM PCI Device
> Assignment feature, so it was re-enabled on January 13.
> 
> If your system stopped booting after that, try adding "intel_iommu=off"
> to the boot arguments, and if your system boots after that, please
> comment on this bug: https://bugzilla.redhat.com/show_bug.cgi?id=481356
> 
> If anyone can confirm this bug we'll need to get some information about
> your system to figure out how to update the blacklist so your machine
> can boot again.

Is this something that should be noted on the Fedora 11 Alpha release
notes one-sheet for people testing that release?  In particular, if we
expect a significant amount of testers might see a lag behind current
Rawhide that exhibits this weird "won't-boot" behavior, we should say
that.

https://fedoraproject.org/wiki/Fedora_11_Alpha_release_notes
 
-- 
Paul W. Frields                                http://paul.frields.org/
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