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    SubjectRe: SATA/IDE Dual Mode w/Intel 945 Chipset or HOW TO LIQUIFY a flash IDE chip under 2.6.18
    Jeff Garzik wrote:

    > Jeff V. Merkey wrote:
    >
    >> Jeff Garzik wrote:
    >>
    >>> Jeff V. Merkey wrote:
    >>>
    >>>>
    >>>> I just finished pulling out a melted IDE flash drive out of a
    >>>> Shuttle motherboard with the intel 945 chipset which claims to support
    >>>> SATA and IDE drives concurrently under Linux 2.6.18.
    >>>>
    >>>> The chip worked for about 30 seconds before liquifying in the
    >>>> chassis. I note that the 945 chipset in the shuttle PC had some
    >>>> serious
    >>>> issues recognizing 2 x SATA devices and a IDE device
    >>>> concurrently. Are there known problems with the Linux drivers
    >>>> with these newer chipsets.
    >>>>
    >>>> One other disturbing issue was the IDE flash drive was configured
    >>>> (and recognized) as /dev/hda during bootup, but when
    >>>> it got to the root mountint, even with root=/dev/hda set, it still
    >>>> kept thinking the drive was at scsi (ATA) device (08,13)
    >>>> and kept crashing with VFS cannot find root FS errors.
    >>>
    >>>
    >>>
    >>> We have two sets of ATA drivers now, and Intel motherboards support
    >>> bazillion annoying IDE modes, so you will need to provide more info
    >>> than this.
    >>>
    >>> Is the motherboard in combined mode?
    >>
    >>
    >>
    >> Yes. "Enhanced mode" is how it is listed in the BIOS.
    >
    >
    > Combined mode is a technical term. Judging from your answers, you are
    > not using combined mode.
    >
    >
    >>> native mode? AHCI or RAID mode?
    >>
    >>
    >> No RAID, just enhanced mode (SATA 3.0 + IDE)
    >
    >
    > Judging from your answers, you are not in AHCI mode.
    >
    > Side note: You should use AHCI if available. Emulating a PATA
    > interface for SATA devices is error prone [in the silicon]. AHCI is
    > native SATA, "enhanced mode" is not.


    AHCI It is.

    Jeff

    >
    >
    >>> The cannot-find-root-FS errors are definitely caused by driver
    >>> and/or initrd misconfiguration. The melted flash, I dunno, maybe
    >>> you managed to get two drivers fighting over the same hardware.
    >>
    >>
    >> No. Seems related to the chipset problems. If I say
    >> "root=/dev/hda2" I have better not be getting errors claiming device
    >> 08:13 could not mount as root. memory corruption?
    >
    >
    > If the kernel cannot mount the requested root= disk, it tries the
    > default that is encoded into the vmlinuz image at build time, which is
    > probably 08:13.
    >
    >
    >> The melted flash seems power related (like pin 20 was live for some
    >> reason on a standard IDE).
    >
    >
    > Probably, otherwise we would have many more reports like this than
    > just yours.
    >
    > Jeff
    >
    >
    >

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