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    SubjectRe: SATA DMA problem (sata_uli)
    Tejun Heo wrote:
    > 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 <>
    >> 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.
    > Is somebody brewing a patch?

    Not to my knowledge. Did you just volunteer? ;-)

    /me runs...


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