linux-kernel - Re: SATA/IDE Dual Mode w/Intel 945 Chipset or HOW TO LIQUIFY a flash IDE chip under 2.6.18

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Date:	Tue, 09 Jan 2007 17:13:22 -0700
From:	"Jeff V. Merkey" <jmerkey@...fmountaingroup.com>
To:	Jeff Garzik <jeff@...zik.org>
CC:	Linux kernel <linux-kernel@...r.kernel.org>
Subject: Re: 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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