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xen-devel
Re: [Xen-devel] [Fwd: Installing from distribution CDs]
I posted a patch on 2/4. Does anyone have a problem with that patch?
Regards,
Ian Pratt wrote:
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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