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    SubjectRe: [PATCH 2.6.22.y] ieee1394: revert "sbp2: enforce 32bit DMA mapping"
    Benjamin Herrenschmidt wrote:
    >>> If setting 32-bit DMA mask fails on ppc64, that sounds like a problem
    >>> with the DMA implementation on that architecture. There are enough cards
    >>> out there that only support 32-bit DMA that this really needs to work..
    >> Yes, could the PPC folks please have a look at it? Thanks.
    > Smells like we may have a bug there. No worries though, all current PPC
    > machines have an iommu that will not give out addresses above 32 bits
    > anyway, but I'll double check what's up.
    > Do you see something in dmesg when that happens ?

    There was nothing in Olaf's report, except for trouble in sbp2 _after_
    the failure. (I don't have a PMac.)
    Stefan Richter
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