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    Subjectata1.00: failed to IDENTIFY (I/O error, err_mask=0x4)
    Hi,

    I am experiencing a strange problem with 2.6.23.15-137.fc8 (Fedora 8)
    kernel. Everything works fine, but if I provide the "nosmp" option to
    the kernel, I get some (S)ATA errors and the system does not boot.

    Here is a screenshot:
    http://folk.uio.no/vegardno/DSCF2543.JPG

    Handwritten summary:
    scsi0 : ahci
    scsi1 : ahci
    ata1: SATA max UDMA/133 cmd 0xf884c100 ctl 0x00000000 bmdma 0x000...
    ata2: SATA max UDMA/133 cmd 0xf884c180 ctl 0x00000000 bmdma 0x000...
    ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
    ata1.00: qc timeout (cmd 0xec)
    ata1.00: failed to IDENTIFY (I/O error, err_mask=0x4)
    ata1: port is slow to respond, please be patient (Status 0x80)
    ata1: COMRESET failed (errno=-16)
    ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
    ...

    I don't see the connection between (no-)smp and ata. Something with
    interrupt routing/IPI, missing irq ack? Booting another !SMP kernel
    works fine. The problem also exists in 2.6.24-rc2.


    Kind regards,
    Vegard Nossum


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