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[n00b@localhost]
Apprentice
Apprentice


Joined: 30 Aug 2004
Posts: 266
Location: London, UK

PostPosted: Wed May 29, 2013 12:16 pm    Post subject: Has GRUB changed recently? Reply with quote

I was setting up NFS remotely on my PC last night. To do so I needed to enable some options in the kernel, recompile and reinstall it. My usual sequence of commands for upgrading the kernel is:
Code:
localhost ~ # cd /usr/src/linux
localhost linux # make menuconfig
/* edit options */
localhost linux # mount /boot
localhost linux # make && make modules && make modules_install && make install
localhost linux # module-rebuild rebuild


After this sequence of commands my /boot directory looks something like this:
Code:
localhost linux # ls -l /boot
total 27642
lrwxrwxrwx 1 root root      19 May 29 11:53 config -> config-3.9.2-gentoo
-rw-r--r-- 1 root root   74765 May 29 11:53 config-3.9.2-gentoo
-rw-r--r-- 1 root root   74691 May 29 11:08 config-3.9.2-gentoo.old
lrwxrwxrwx 1 root root      23 May 29 11:53 config.old -> config-3.9.2-gentoo.old
drwxr-xr-x 2 root root    1024 May 26 16:41 grub
-rw-r--r-- 1 root root 3961271 Oct  4  2012 initramfs.cpio.gz
drwx------ 2 root root   12288 May 31  2011 lost+found
lrwxrwxrwx 1 root root      23 May 29 11:53 System.map -> System.map-3.9.2-gentoo
-rw-r--r-- 1 root root 1993910 May 29 11:53 System.map-3.9.2-gentoo
-rw-r--r-- 1 root root 1986803 May 29 11:08 System.map-3.9.2-gentoo.old
lrwxrwxrwx 1 root root      27 May 29 11:53 System.map.old -> System.map-3.9.2-gentoo.old
lrwxrwxrwx 1 root root      20 May 29 11:53 vmlinuz -> vmlinuz-3.9.2-gentoo
-rw-r--r-- 1 root root 4283616 May 29 11:53 vmlinuz-3.9.2-gentoo
-rw-r--r-- 1 root root 4252736 May 29 11:08 vmlinuz-3.9.2-gentoo.old
lrwxrwxrwx 1 root root      24 May 29 11:53 vmlinuz.old -> vmlinuz-3.9.2-gentoo.old


My /boot/grub/grub.conf for the past 5 years has been:
Code:
localhost linux # cat /boot/grub/grub.conf
# This is a sample grub.conf for use with Genkernel, per the Gentoo handbook
# http://www.gentoo.org/doc/en/handbook/handbook-x86.xml?part=1&chap=10#doc_chap2
# If you are not using Genkernel and you need help creating this file, you
# should consult the handbook. Alternatively, consult the grub.conf.sample that
# is included with the Grub documentation.

default 0
timeout 3
splashimage=(hd0,0)/boot/grub/splash.xpm.gz                                                                                                                                       
                                                                                                                                                                                   
title Gentoo Linux                                                                                                                                                                 
root (hd0,0)                                                                                                                                                                       
kernel /boot/vmlinuz root=LABEL=root video=uvesafb:ywrap,mtrr:2,1920x1080-32@70 splash=silent,fadein,fadeout,theme:natural_gentoo quiet console=tty1                               
initrd /boot/initramfs.cpio.gz

title Gentoo Linux no framebuffer
root (hd0,0)
kernel /boot/vmlinuz root=LABEL=root video=uvesafb:off
initrd /boot/initramfs.cpio.gz

title Gentoo Linux old
root (hd0,0)
kernel /boot/vmlinuz.old root=LABEL=root video=uvesafb:ywrap,mtrr:2,1920x1080-32@70 splash=silent,fadein,fadeout,theme:natural_gentoo quiet console=tty1
initrd /boot/initramfs.cpio.gz

title Gentoo Linux old no framebuffer
root (hd0,0)
kernel /boot/vmlinuz.old root=LABEL=root video=uvesafb:off
initrd /boot/initramfs.cpio.gz

# vim:ft=conf:


When I rebooted this time the system didn't come back up and when I got into work this morning GRUB was displaying "Error 15" (not "Error 15: File Not Found" as seems to turn up when Googling). After spending nearly an hour rebooting with different kernels/settings I added the following entry to grub.conf which has allowed me to boot into the new kernel:
Code:
title Gentoo Linux (noroot)
kernel (hd0,0)/vmlinuz root=LABEL=root video=uvesafb:ywrap,mtrr:2,1920x1080-32@70 splash=silent,fadein,fadeout,theme:natural_gentoo quiet console=tty1
initrd (hd0,0)/initramfs.cpio.gz


Does anyone know what may have happened to stop my usual method of upgrading the kernel from working this time?
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Logicien
Veteran
Veteran


Joined: 16 Sep 2005
Posts: 1369
Location: Montréal

PostPosted: Wed May 29, 2013 1:19 pm    Post subject: Reply with quote

Are you sure all your kernels are in the root directory of the boot partition or some of them are in the /boot directory of the root partition?

I would check the contain of the /boot directory without the boot partition mounted in and then check again with the boot partition mounted in the /boot/directory.. When you have a boot partition, the /boot directory should be emply when the boot partition is not mounted in.

If so, when the boot partition is mounted in the /boot directory, doing
Code:
cd /boot
ln -s . boot

can resolv the problem. So you can use (hd0,0)/boot/vmlinuz or (hd0,0)/vmlinuz.
_________________
Paul
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[n00b@localhost]
Apprentice
Apprentice


Joined: 30 Aug 2004
Posts: 266
Location: London, UK

PostPosted: Wed May 29, 2013 1:36 pm    Post subject: Reply with quote

Logicien wrote:
Are you sure all your kernels are in the root directory of the boot partition or some of them are in the /boot directory of the root partition?

Yes. This was one of the first things I checked. The unmounted /boot directory on the root partition is empty. All the kernels are correctly stored on the boot partition and appear in /boot when mounted.

Logicien wrote:
If so, when the boot partition is mounted in the /boot directory, doing
Code:
cd /boot
ln -s . boot


can resolv the problem. So you can use (hd0,0)/boot/vmlinuz or (hd0,0)/vmlinuz.


This sounds like it might do the trick. I seem to remember there being a symlink like that before but it must have got deleted somehow. I'll try later as my PC makes a racket when it turns on so I don't tend to reboot that often.
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