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    SubjectRe: libata: 2.6.7-bk6,12 hang with ata_piix in combined mode; -bk5 ok
    Bill Rugolsky Jr. wrote:
    > Jeff,
    > I have a Dell Poweredge 750 with a pair of Maxtor 250GB SATA drives
    > running Fedora Core 1 + upgrades to support 2.6.
    > The Dell BIOS configures the controller in combined mode.
    > Kernel 2.6.7-bk5 boots, while 2.6.7-bk6,bk12 generate the following
    > timeout (copied by hand):
    > ata_piix: combined mode detected
    > ACPI: PCI interrupt 0000:1f.2[A]: no GSI
    > ata: 0x1f0 IDE port busy
    > ata1: SATA max UDMA/133 cmd 0x170 ctl 0x376 bmdma 0xFEA8 irq 15
    > ata1: dev 0 ATA, max UDMA/133 488281250 sectors: lba48
    > ata1: dev 1 ATA, max UDMA/133 488281250 sectors: lba48
    > ata1: dev0 configured for UDMA/133
    > ata1: dev1 configured for UDMA/133
    > scsi0: ata_piix
    > Vendor: ATA Model: Maxtor 7Y250M0 Rev: YAR5
    > Type: Direct Access ANSI SCSI revision: 05
    > SCSI device sda: 488281250 512-byte hdwr sectors (250000MB)
    > SCSI device sda: drive cache: write back
    > sda:<3>ata1: command 0x25 timeout, stat 0xd0 host_stat 0x64

    If "acpi=off" does not fix this, please test the patch I posted recently
    [PATCH,RFT] SATA interrupt handling

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