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    SubjectRe: [regression, bisected] fails to boot on Dell Optiplex 760 with VT-d enabled
    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 ?

    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 Intel Corporation

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