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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 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.


>> 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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