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. Thanks, -w
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