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    SubjectRe: SATA DMA problem (sata_uli)
    Jeff Garzik wrote:
    > Alan wrote:
    >>> I tracked it down to one of the drives being forced into PIO4 mode
    >>> rather than UDMA mode; dmesg bits:
    >>> ata4.00: ATA-7, max UDMA/133, 586072368 sectors: LBA48 NCQ (depth 0/32)
    >>> ata4.00: ata4: dev 0 multi count 16
    >>> ata4.00: simplex DMA is claimed by other device, disabling DMA
    >>
    >> Your ULi controller is reporting that it supports UDMA upon only one
    >> channel at a time. The kernel is honouring this information. The older
    >> ULi (was ALi) PATA devices report simplex but let you turn it off so
    >> see if the following does the trick. Test carefully as always with
    >> disk driver
    >> changes.
    >>
    >> (Jeff probably best to check the docs before merging this but I believe
    >> it is sane)
    >>
    >> Signed-off-by: Alan Cox <alan@redhat.com>
    >
    > My Uli SATA docs do not appear to cover the bmdma registers :( Only the
    > PCI config registers.
    >
    > But regardless, I think the better fix is to never set ATA_HOST_SIMPLEX
    > if ATA_FLAG_NO_LEGACY is set.
    >
    > None of the SATA controllers I've ever encountered has been simplex.

    Just another data point. The same problem is reported by bug #7590.

    http://bugzilla.kernel.org/show_bug.cgi?id=7590

    Is somebody brewing a patch?

    --
    tejun
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