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    SubjectRe: libata PATA patch for 2.6.16-rc5
    Hi,

    matthieu castet wrote:
    > Hi Alan
    >
    > Alan Cox wrote:
    >
    >> On Maw, 2006-02-28 at 23:36 +0100, matthieu castet wrote:
    >>
    >>> for the SIL680 I have a 100Mhz clock instead of a 133Mhz with ide/pci
    >>> driver [1]
    >>
    >>
    >>
    >> Fixed (missing break in switch)
    >>
    >>
    >>> The ATAPI doesn't seem to work fine with VIA.
    >>
    >>
    >>
    >> Still investigating
    >>
    > If it can help you, I attach a log with debug enabled.
    >
    Ok, I think I have a hint.

    The drive that is failling is the secondary slave [1].
    When I try to change xfermode with hdparm -X, it take some times (10 s)
    and I found an error in the kernel log.
    But even with that error, it seem the xfermode is changed.

    What happen with libata if we lose an interrupt ?


    Matthieu




    [1]
    /dev/hdd:

    ATAPI CD-ROM, with removable media
    Model Number: CD-RW CDR-6S48
    Serial Number:
    Firmware Revision: SSG5
    Standards:
    Used: ATAPI for CD-ROMs, SFF-8020i, r2.5
    Supported: CD-ROM ATAPI-2
    Configuration:
    DRQ response: 50us.
    Packet size: 12 bytes
    Capabilities:
    LBA, IORDY(cannot be disabled)
    DMA: mdma0 mdma1 mdma2 udma0 udma1 *udma2
    Cycle time: min=120ns recommended=120ns
    PIO: pio0 pio1 pio2 pio3 pio4
    Cycle time: no flow control=227ns IORDY flow control=120ns

    [2]
    hdd: lost interrupt
    hdd: CHECK for good STATUS
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