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    Subject[2.6.19-rc2] SATA boot problems
    Hi,

    I'm having problems booting from a SATA disk with 2.6.19-rc2.
    Grub loads fine, but when the kernel boots, it *sometimes* ends up with
    VFS: Cannot open root device "sda5" or unknown-block(0,0)

    The strange thing is that this happens only in 2/3 of the boot attempts.
    If I reset the machine, the next attempt is likely to succeed.
    I first noted this when switching from 2.6.17 (2.6.17.11, IIRC) to
    2.6.18 and it persists in 2.6.19-rc2 (Windows does not encounter similar
    problems on the same machine).

    I attached a diff of a successful and an unsuccessful netconsole log
    below. It seems that the drive is sometimes simply not detected...
    I'm not using an initrd and changing the kernel command line from
    root=/dev/sda5 to root=0x0805 did not help.

    The controller is:
    00:1f.2 IDE interface: Intel Corporation 82801FB/FW (ICH6/ICH6W) SATA
    Controller (rev 03)

    Any ideas? Please CC me, as I'm not subscribed.
    Robert


    ata1: SATA max UDMA/133 cmd 0xEC00 ctl 0xE802 bmdma 0xDC00 irq 19
    ata2: SATA max UDMA/133 cmd 0xE400 ctl 0xE002 bmdma 0xDC08 irq 19
    scsi0 : ata_piix
    +ata1.00: ATA-7, max UDMA/133, 312581808 sectors: LBA48 NCQ (depth 0/32)
    +ata1.00: ata1: dev 0 multi count 16
    +ata1.00: configured for UDMA/133
    scsi1 : ata_piix
    ATA: abnormal status 0x7F on port 0xE407
    + Vendor: ATA Model: Maxtor 6V160E0 Rev: VA11
    + Type: Direct-Access ANSI SCSI revision: 05
    +SCSI device sda: 312581808 512-byte hdwr sectors (160042 MB)
    +sda: Write Protect is off
    +SCSI device sda: drive cache: write back
    +SCSI device sda: 312581808 512-byte hdwr sectors (160042 MB)
    +sda: Write Protect is off
    +SCSI device sda: drive cache: write back
    + sda: sda1 sda2 sda3 < sda5 sda6 sda7 sda8 sda9 sda10 sda11 sda12 >
    +sd 0:0:0:0: Attached scsi disk sda
    +sd 0:0:0:0: Attached scsi generic sg0 type 0
    ACPI: PCI Interrupt 0000:00:1d.7[A] -> GSI 23 (level, low) -> IRQ 20
    ehci_hcd 0000:00:1d.7: EHCI Host Controller
    ehci_hcd 0000:00:1d.7: new USB bus registered, assigned bus number 1

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