On Wed, Feb 05, 2003 at 01:07:35AM +0100, Guido Guenther wrote:
> On IP22 the PROM uses SystemPartition to find the kernel/bootloader.
> We set it to something like scsi(0)disk(1)rdisk(0)partition(8) to grab
> it from the vh. Is SystemPartition used differently on IP27?
I think SystemPartition is ignored (haven't been able to see any
evidence to the contrary... I should look in the source...)
> > So, we should obviously support OSLoadPartition=/dev/sda1 (=>
> > root=/dev/sda1),
> > but it would also be nice to support OSLoadPartition=dksc(0,1,3).
> Well we could either check if OSLoadPartition matches the linux device
> naming scheme or the other way around and see if it looks like a valid
> device identifier used by the PROM (I'd prefer the later, though) - or
> simply make the OSLoadPartition <-> root= mapping '#ifdef CONFIG_SGI_IP22'.
I think the middle option (the one you prefer) of matching dksc(0,1,3)
and converting it /dev/sda2 is best. Just, it has to happen after the
hard disks are probed - /dev/sdXY are allocated dynamically (in
a predictable-for-end-user way), so you need to find out what it was
allocated to. Is this doable in a nice way?
BTW, I think file system labels are a much better way of identifying FSs.
Perhaps this discussion is irrelevant... people who are using
OSLoadPartition to control their bootloader should just add a root=