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xen-devel
RE: [Xen-devel] [Fwd: Installing from distribution CDs]
Have we got concensus about how to handle this? (and hence a definitive
patch).
Requiring people to change there config command lines is probably OK
provided that we're making it closer to standard Linux behaviour.
Ian
> -----Original Message-----
> From: Anthony Liguori [mailto:anthony@xxxxxxxxxxxxx]
> Sent: 03 February 2005 02:17
> To: Ian Pratt
> Cc: Anthony Liguori; Jared Rhine; xen-devel@xxxxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-devel] [Fwd: Installing from distribution CDs]
>
> Ian Pratt wrote:
>
> >Thanks for looking into this. I wander if it's something to
> do with the
> >way xen packages up the module as an initrd for dom0? Maybe
> there's some
> >difference between an initrd and a ramdisk?
> >
> >
> Didn't have time this afternoon but I was able to look into
> it more this
> evening and I found the culprit. In arch/i386/kernel/setup.c
> there was
> the following line around L1363:
>
> ROOT_DEV = MKDEV(RAMDISK_MAJOR,0);
> /*old_decode_dev(ORIG_ROOT_DEV);*/
>
> This defaults the root device to /dev/ram0 instead of trying
> to get it
> from the boot loader. I'm not sure why this there (perhaps a part of
> early development?). I've attached a patch that puts back the
> old_decode_dev call and the behavior becomes exactly what
> you'd expect:
> if no root= is specified, initrd still works but if /linuxrc
> exits you
> get a VFS error because no root= is specified.
>
> This is what Linux would normally do.
>
> It's very important to note though that applying this patch
> means that
> if people had ramdisk=... lines in their configs and didn't have
> root=/dev/ram0, their machines won't boot anymore.
>
> A solution would be to add an initrd option to the configuration file
> and have the ramdisk= option default the root device to /dev/ram0.
>
> I've tested this patch on a couple day old copy of xen-unstable. I'm
> curious to know what the source of this was though because I
> don't feel
> very comfortable with just restoring something that was
> obviously taken
> out for a reason..
>
> Regards,
> Anthony Liguori
>
> Signed-off-by: Anthony Liguori
>
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