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    SubjectRe: [PATCH 2.6.22.y] ieee1394: revert "sbp2: enforce 32bit DMA mapping"
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    Stefan Richter <stefanr@s5r6.in-berlin.de> writes:
    >
    > 1.) The ieee1394 subsystem is known to work on x86_64 with more than 4
    > GB RAM,

    It's actually ~3+GB where memory above the 4GB barrier starts appearing.
    In some extreme cases even for 2+GB.

    > so I gather that architecture code already sets a proper DMA
    > mask for all those 32bit PCI OHCI-1394 implementations out there.

    If you don't set a DMA mask then the default is always 4GB.

    -Andi
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