On Sat, Nov 20, 2010 at 04:28:33AM +0100, Andries E. Brouwer wrote:
> Answering myself (and providing info that can be Googled):
>
> > I wanted to boot a recent kernel on an old machine and failed.
> > The last kernel that worked was 2.6.27.
> > What goes wrong is that the disks are no longer detected on 2.6.28.
>
> A typical error would be
>
> Cannot open root device 342 or unknown block (3,66)
>
> Reading the code shows that the default probing is no longer done.
Well, this got changed in 20df429dd6671804999493baf2952f82582869fa since
we had other problems when having ide-generic and a specific PCI IDE
controller driver enabled at the same time, AFAIR.
There are two fixes I can think of - you either enable the specific IDE
controller driver for your chipset or you enforce probing with
ide_generic.probe_mask=0x3f
on the kernel command line.
HTH.
--
Regards/Gruss,
Boris.
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