Messages in this thread |  | | | Subject | Re: [regression, bisected] fails to boot on Dell Optiplex 760 with VT-d enabled | | From | David Woodhouse <> | | Date | Mon, 17 Aug 2009 23:17:03 +0100 |
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On Mon, 2009-08-17 at 14:27 -0700, Faidon Liambotis wrote: > I am experiencin a bug on an Dell Optiplex 760 with a configuration that > has an Intel Core2 Q9550 CPU and with an up-to-date BIOS, version A03. > > When "VT for Direct I/O" is enabled in the BIOS, v2.6.30 boots and works > perfectly, while v2.6.31-rc1..rc6 fail (both of them x86-64). > > More specifically, I get an endless loop of printing the following > messages in > the screen: > DMAR: [DMA Read] Request device [ff:1f.7] fault addr > fffffffffffff000 > DMAR: [fault reason 255] Unknown > and the boot process doesn't move on from there.
Is it fixed by http://git.infradead.org/iommu-2.6.git/commit/0815565a ?
I strongly suspect you weren't actually using the IOMMU in your 'working' 2.6.30 kernel? Can you show a full log of that one booting?
-- David Woodhouse Open Source Technology Centre David.Woodhouse@intel.com Intel Corporation
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