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    SubjectRe: 2.6.18 - AHCI detection pauses excessively
    Berck E. Nash wrote:
    > AHCI pauses heartily on during detection boot, but eventually proceeds.
    > I've mentioned the problem before, but have since narrowed it down a
    > bit. The problem does not occur in 2.6.17.3, but does occur in 2.6.18.
    > The problem is still occurring both in 2.6.19-rc5 as well as
    > 2.6.19-rc5-mm1.
    >
    > Please cc me on replies since I am not subscribed to LKML.
    >
    > Messages surrounding the hang:
    >
    > scsi2 : ahci
    > ata2: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
    > ata2.00: qc timeout (cmd 0xec)
    > ata2.00: failed to IDENTIFY (I/O error, err_mask=0x104)
    > ata2: port is slow to respond, please be patient (Status 0x80)
    > ata2: port failed to respond (30 secs, Status 0x80)
    > ata2: COMRESET failed (device not ready)
    > ata2: hardreset failed, retrying in 5 secs
    > ata2: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
    > ata2.00: ATA-6, max UDMA/133, 640 sectors: LBA
    > ata2.00: ata2: dev 0 multi count 1
    > ata2.00: configured for UDMA/133
    >
    > I should note that on this system ata1 and ata3 both detect quickly, but
    > they have 1.5 Gbps devices whereas ata2 has a 3.0Gbps device.

    Hmmm.. Can you try with the attached patch applied? Also, please turn
    on kernel config 'Kernel Hacking -> Show timing info on printks' and
    report boot dmesg.

    Thanks.

    --
    tejun
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