Booting sparkly new F12 install, error 13 from grub.

Bill Davidsen davidsen at tmr.com
Thu Dec 10 18:05:04 UTC 2009


Tom H wrote:
>> Resend as there has been no reply, with added info.
>>
>> I finally said to hell with it and let F12 install itself on /dev/sdb
>> with all its defaults.
>>
>> I was surprised on the reboot when my usual grub menu from
>> /dev/sda was all that showed up, no mention of an F12 install at all.
>>
>> Added: I had it install everything in the options list, but gave it only
>> /dev/sdb to play with in the available disks menu's, & use the defaults on
>> /dev/sdb, so it made a  100 meg /boot, using ext4, and a logical volume out
>> of the rest of the drive.  I have NDI how to query the filesystem used there,
>> other than trying to mount /dev/sdb1 as ext3 fails.
>>
>> So, since I had blown away a centos install to put F12 on /dev/sdb, I
>> carved up a fresh grub stanza that reads like this and added it to
>> /dev/sda1/grub/grub.conf:
>>
>> # grub.conf generated by anaconda
>> #
>> # Note that you do not have to rerun grub after making changes to this file
>> # NOTICE:  You have a /boot partition.  This means that
>> #          all kernel and initrd paths are relative to /boot/, eg.
>> #          root (hd0,0)
>> #          kernel /vmlinuz-version ro root=/dev/sdb3
>> #          initrd /initrd-version.img
>> #boot=/dev/sda
>> default=19
>> fallback=1
>> timeout=15
>> splashimage=(hd0,0)/grub/splash.xpm.gz
>>
>> [...]
>>
>> #21 new stanza
>> title   Fedora 12 (2.6.31.6-162.fc12.x86_64 from dev/sdb)
>>        root (hd1,0)
>>        kernel /vmlinuz-2.6.31.6-162.fc12.x86_64 ro root=/dev/mapper/vg_coyote-
>> lv_root  LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc
>> KEYTABLE=us rhgb quiet
>>        initrd /initramfs-2.6.31.6-162.fc12.x86_64.img
>>
>> which is in fact pasted from the /dev/sdb1/grub/grub.conf except for the
>> initial "root (hd1,0)" statement.
>>
>> So it looks as if I might have to 'chainloader +1 ' it instead, so how
>> do I do that?  I've never done that before.
>>
>> Also, that /dev/sdb1 partition only mounts as ext4 if that is important.
>>
>> Added: I experimentally added a 'chainloader+1' as the next line after the
>> root (hd1,0) in the /dev/sda1/grub/grub.conf, but all that seemed to do was
>> add another 10 second delay before I get the error 13 message.  I would have
>> thought from what little I know about grub, that this should force a reload,
>> effectively a grub restart, from the mbr of /dev/sdb.  Is there something I
>> need to change in the /dev/sdb1/grub/grub.conf also?
> 
> Chainloading will not work because F12 defaults to grub1, which cannot
> boot from an ext4 /boot.
> 
You are almost right. The F12 version of grub1 will boot from ext4, Gene's 
problem is that his installed graub is F11, which will not. I couldn't reproduce 
this because I always set my /boot to ext2, which always works fine.

Fastest solution seems to lie in backup, change to ext3, restore, and use of 
either map or chain should work fine.

> Your F12 stanza looks OK (I have never used so many options but why not?).
> 
> Is your /boot/grub/device.map on /dev/sda associating (hd1) to /dev/sdb?
> 


-- 
Bill Davidsen <davidsen at tmr.com>
   "We have more to fear from the bungling of the incompetent than from
the machinations of the wicked."  - from Slashdot




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