Re: [2.6.19-rc2] SATA boot problems

[Tejun Heo]

Mark Lord wrote:
> Hi.  I'm copying your posting for the linux-ide mailing list,
> where the libata designers hang out.
>
> Robert Wruck wrote:
> > Hi,
> >
> > I'm having problems booting from a SATA disk with 2.6.19-rc2.
> > Grub loads fine, but when the kernel boots, it *sometimes* ends up with
> > VFS: Cannot open root device "sda5" or unknown-block(0,0)
> >
> > The strange thing is that this happens only in 2/3 of the boot attempts.
> > If I reset the machine, the next attempt is likely to succeed.
> > I first noted this when switching from 2.6.17 (2.6.17.11, IIRC) to
> > 2.6.18 and it persists in 2.6.19-rc2 (Windows does not encounter similar
> > problems on the same machine).
> >
> > I attached a diff of a successful and an unsuccessful netconsole log
> > below. It seems that the drive is sometimes simply not detected...
> > I'm not using an initrd and changing the kernel command line from
> > root=/dev/sda5 to root=0x0805 did not help.
> >
> > The controller is:
> > 00:1f.2 IDE interface: Intel Corporation 82801FB/FW (ICH6/ICH6W) SATA
> > Controller (rev 03)
> >
> > Any ideas? Please CC me, as I'm not subscribed.
> > Robert

Can you give a shot at the latest -mm (2.6.19-rc2-mm2)?  It contains 
device-detection-via-polling which is supposed to fix problems similar 
to yours.

--
tejun
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