Public bug reported:
Hello
I don't know if Ubuntu have any plans to use Grub2 for PowerPC, but
currently there is an easily fixable bug with os-prober:
Existing installations that use yaboot will normally have their root
defined like so in a yaboot.conf:
root=UUID=big-long-number-0000
However, os-prober (or more accuratly the file 40yaboot) when it scans
the yaboot.conf will read this as
root=UUID
Consequently, when the operating system is selected from a grub2 menu it
fails to boot.
This can be solved by changing (in 40yaboot)
case "$1" in
root)
rootdev="$(dequote "$2")"
to
case "$1" in
root)
shift 1
rootdev="$(dequote "${line#root=}")"
I'll make a proper diff patch when I'm back on a linux machine. I'm not
sure if the shift 1 is necessary. but some of the other cases seem to
have it so I put it in.
I had a look at yaboot-installer to see how that does things and
interestingly that has its own piece of code to setup root:
# Get UUID= or LABEL= for the given unix partition block device.
# If it could not be determined, give the unix partition block device back.
uuidlabel() {
echo `devsymlink "$1" nobyid` \
| sed -e "s,/dev/disk/by-uuid/,UUID=," \
-e "s,/dev/disk/by-label/,LABEL=,"
}
root="`uuidlabel "$mappedpartition"`"
This therefore doesn't suffer from this bug. It's actually quite a
sensible thing to do since root=/dev/sdx (which a lot of old installs
used to use) is unreliable. I don't know whether to create a patch for
os-prober to do the same, or if the grub2 scripts should really sort it
out.
Anyway, that's turned into a bit of a ramble. Oh, nearly forgot, fedora
also has a patch on os-prober for PowerPC - see
https://bugzilla.redhat.com/show_bug.cgi?id=825041 .
I'm toying with the idea of creating an updated iso for Ubuntu 12.04.
If I do then I plan to use Grub2 as the bootloader. If you would like
to collaborate on shifting PowerPC to grub2 then get in touch!
Thanks
** Affects: os-prober (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1261817
Title:
Grub2 does not setup existing linux operating systems correctly on
PowerPC
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