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Re: grub2 on power6 box.

From: Lennart Sorensen
Subject: Re: grub2 on power6 box.
Date: Wed, 28 Jul 2010 10:45:16 -0400
User-agent: Mutt/1.5.18 (2008-05-17)

On Wed, Jul 28, 2010 at 05:27:33PM +0300, Vladimir 'φ-coder/phcoder' Serbinenko 
> On 07/23/2010 11:02 PM, Lennart Sorensen wrote:
> > So how would one explain to grub-install that it needs part_msdos when
> > the partition tables that the md devices are running on are of type msdos?
> > How would one make it automatically add the correct prefix (since it
> > needs either (hd,msdos#)/boot/grub or (md0)/boot/grub or similar added
> > instead of the default)?  And of course finally it would have to dd to
> > the target device, rather than just create a file and try to make the
> > firmware boot that file.  The boot device also has to be the full disk
> > on the IBM, not a disk,partition,file combination.
> >   
> Normally it should be all autodetected. Could you file a bug report for
> this? Could you tell the commands to reproduce it? I have a PPC box but
> it has only one disk but a mdraid on partitions should do it.

Well the problem appears to be that grub-install does this:

# Then the partition map module.  In order to support partition-less media,
# this command is allowed to fail (--target=fs already grants us that the
# filesystem will be accessible).
for x in `$grub_probe --target=partmap --device ${grub_device} 2> /dev/null`; do
   partmap_module="$partmap_module part_$x";

Unfortunately there is nothing that defines ${grub_device} in the script.
If it used the target install device, it would in fact get the right

Now of course another issue is that the script aborts if /boot/grub is
not a seperate mount point.  Well on the IBM powerpc there is no reason
to make it a seperate mount point since you can't boot from a partition
with a filesystem anyhow.

I am not sure how one would go about getting grub-install to figure out
the grub name for the filesystem holding /boot/grub so that it can pass
the prefix, since it could be (md0)/boot/grub or (md/0)/boot/grub

So where is the bug track system?

Len Sorensen

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