Messages in this thread | | | Subject | Re: Current git fails to boot with VT-D enabled due to flood of DMAR errors | From | David Woodhouse <> | Date | Sat, 19 Sep 2009 21:41:08 -0700 |
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On Sat, 2009-09-19 at 22:32 -0600, Robert Hancock wrote: > On an Asus P7P55D Pro-based system (Lynnfield CPU), with Intel VT-d > enabled in the BIOS, on 2.6.30.5 (the previous version I tested) I get > these lines in dmesg: > > DMAR:Host address width 36 > DMAR:DRHD (flags: 0x00000001)base: 0x00000000fed90000 > DMAR:RMRR base: 0x00000000000e4000 end: 0x00000000000e7fff > DMAR:RMRR base: 0x00000000bf7ec000 end: 0x00000000bf7fffff > Not all IO-APIC's listed under remapping hardware > > In current -git, I get these lines as well, but then I get this: > > DRHD: handling fault status reg ffffffff > DMAR:[DMA Read] Request device [ff:1f.7] fault addr fffffffffffff000 > DMAR:[fault reason 255] Unknown > > The last two lines repeat in a continuous flood and the system doesn't > boot. This happens even if I pass "intel_iommu=off" (which seems like > it's already the default). > > Could be a kernel bug or a BIOS bug, but in the latter case we should > probably deal with it better. The registers all reading FF seems like > maybe the registers are disabled or something..
This ought to be 'fixed' in linux-next by this commit: http://git.infradead.org/iommu-2.6.git/commitdiff/0815565ad
Please try linux-next or the iommu tree from git://git.infradead.org/iommu-2.6.git
-- David Woodhouse Open Source Technology Centre David.Woodhouse@intel.com Intel Corporation
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