Broken scsi on 2.6.12rc4 + realtime-preempt-2.6.12-rc4-V0.7.47-03 ( adaptec aic7901a and lsi 53c1030 fusion-mpt )

Broken scsi on 2.6.12rc4 + realtime-preempt-2.6.12-rc4-V0.7.47-03 ( adaptec aic7901a and lsi 53c1030 fusion-mpt )

[Serge Noiraud]

The kernel with the realtime-preempt-2.6.12-rc4-V0.7.47-03 patch works
well on IDE.
I have a cannot open root device at boot on two machines ( i386 ) with
aic79xx or LSI controler.
If I suppress the realtime patch, it works.
I tried to set different options for realtime without success.

On the first machine  with LSI :
The lspci command shows :
...
04:03.0 SCSI storage controller: LSI Logic / Symbios Logic 53c1030 PCI-X
Fusion-MPT Dual Ultra320 SCSI (rev 07)
04:03.1 SCSI storage controller: LSI Logic / Symbios Logic 53c1030 PCI-X
Fusion-MPT Dual Ultra320 SCSI (rev 07)
...

On the second one with adaptec :
The lspci command shows :
...
03:05.0 SCSI storage controller: Adaptec AIC-7901A U320 (rev 03)
...

During boot the following error occurs :
...
VFS: Cannot open root device "0806" or unknown-block(8,6)
Please append a correct "root=" boot option
Kernel panic - not syncing: VFS: Unable to mount root fs on
unknown-block(8,6)

Any idea ?
I can send more info.

Re: Broken scsi on 2.6.12rc4 + realtime-preempt-2.6.12-rc4-V0.7.47-03 ( adaptec aic7901a and lsi 53c1030 fusion-mpt )

[Steven Rostedt]

On Wed, 2005-05-18 at 11:31 +0200, Serge Noiraud wrote:
> The kernel with the realtime-preempt-2.6.12-rc4-V0.7.47-03 patch works
> well on IDE.
> I have a cannot open root device at boot on two machines ( i386 ) with
> aic79xx or LSI controler.
> If I suppress the realtime patch, it works.
> I tried to set different options for realtime without success.
[...]
> During boot the following error occurs :
> ...
> VFS: Cannot open root device "0806" or unknown-block(8,6)
> Please append a correct "root=" boot option
> Kernel panic - not syncing: VFS: Unable to mount root fs on
> unknown-block(8,6)
> 
> Any idea ?

This looks like the same error you would get if these drivers were
compiled as modules and not placed in the initrd.  The RT patch adds the
-V0.7.47-03 to the version of the kernel so the modules do get loaded
into a different /lib/modules directory and should have a different
initrd file.  Make sure that your initrd is correct, or just compile the
necessary modules into the kernel (not as modules).

-- Steve