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    SubjectRe: 2.6.20 libata cdrom
    Mark Lord wrote:
    > Tejun Heo wrote:
    > ..
    >>>>> scsi1 : ata_piix
    >>>>> ata2.00: failed to IDENTIFY (I/O error, err_mask=0x1)
    > ..
    >> The err_mask is AC_ERR_DEV indicating that the device raised aborted the
    >> IDENTIFY command. I wonder what's going on.
    >>
    >> Can you change "#undef ATA_DEBUG" in include/linux/libata.h to "#define
    >> ATA_DEBUG" and report the resulting dmesg? There will be a LOT of
    >> messages so you probably want to increase printk buffer size and detach
    >> other devices if possible. It would be best if your root device isn't
    >> driven by libata so that you can just insert the module and store the
    >> resulting dmesg.
    >
    > If the command really was "IDENTIFY", then of course it failed.
    > This is an ATAPI device, and it wants "PACKET_IDENTIFY".
    >
    > Maybe libata somehow thinks it's ATA rather than ATAPI?

    And this is the second one today where it would be very useful
    to see a tf dump. It's time to add one to that code patch, methinks.
    -
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