Continuing the saga: F9alpha AMD-64 HP DC7700 SFF switch_root: no filesystems

Will Woods wwoods at redhat.com
Wed Mar 12 05:40:42 UTC 2008


On Mar 11, 2008, at 8:32 PM, John Summerfield wrote:

> Michal Jaegermann wrote:
>> On Tue, Mar 11, 2008 at 04:59:50PM +0900, John Summerfield wrote:
>>> Note that the ATA buses are detected - a full transcription is here:
>>> https://bugzilla.redhat.com/process_bug.cgi
> https://bugzilla.redhat.com/show_bug.cgi?id=436099
>> Try again, please. (I made the same "copy-and-waste" in a hurry
>> mistakes in the past. :-)
>
> I normally double-click and that doesn't stop at the "?." I am  
> cursed with the "swapped buttons" bug and that's been making lide  
> difficult.
>
> https://bugzilla.redhat.com/show_bug.cgi?id=436099
>>> and so's the SATA DVD drive, Just not the two SATA drives.
>> Does the following look familiar?
> Looks familiar, but I don't think it's the same. I don't get a  
> timeout. B'sides, mine's Intel CPU and chips.
>
>> https://bugzilla.redhat.com/show_bug.cgi?id=436591
>> Note also URL references mentioned in comments.  What about
>
> nvidia chips. Mine are Chipzilla.
>> http://lkml.org/lkml/2008/3/9/136
>> and other messages in the same thread?  If that is the case
>> then maybe 'irqpoll' has a chance to alleviate the problem
>> at least enough to boot?
>>   Michal
>
> The Jones boy think it's mkinitrd. I'm sceptical, it the same works  
> for other kernels, but I do wish it would go away.

There were a *lot* of people who were unable to boot after we moved to  
pre-release 2.6.25 kernels:

0) mkinitrd figures out what device types / modules it's dealing with  
by poking around in /sys.
1) There are big changes in the layout of /sys in 2.6.25 kernels.
2) Therefore, initrds created for 2.6.25 kernels fail under certain  
(common) conditions.

So, nearly all of the "cannot find /dev/root" problems we've seen have  
been mkinitrd-related. So davej is correct: it is very likely to be a  
mkinitrd bug. It *might* actually be something in the sata driver..  
but I can't really tell one way or the other.

What's your disk layout / fstab look like?

-w




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