Hi. I'm copying your posting for the linux-ide mailing list, where the libata designers hang out. Robert Wruck wrote:
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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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