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lyallp
Veteran
Joined: 15 Jul 2004
Posts: 1579
Location: Adelaide/Australia
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 Posted: Sat Oct 19, 2013 3:55 am Post subject: grub 2 - getting mine working... |
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I have been a long time user of legacy grub.
I dual boot Gentoo linux and Windows 7.
My existing grub config looks like this
| Code: | default 0
fallback 1
timeout 5
# raid not assembling does not seem to actually not assemble
title Gentoo Linux 3.10.7-gentoo-r1 GenKernel no Kernel RAID Assemble
root (hd2,0)
kernel /boot/kernel-genkernel-x86_64-3.10.7-gentoo-r1 dolvm domdadm raid=noautodetect real_root=/dev/md126 root=/dev/md126 video=uvesafb:ywrap,mtrr:3,1280x1024-32@60
initrd /boot/initramfs-genkernel-x86_64-3.10.7-gentoo-r1
title GRUB2 Chainload
root (hd2,0)
kernel /boot/grub/i386-pc/core.img
boot
title Windows 7 x64 (from hd1)
#map (hd0) (hd1)
#map (hd1) (hd0)
rootnoverify (hd1,0)
makeactive
chainloader +1
boot
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My specifics include
- I use XFS
- I have multiple XFS partitions, not a single root partition.
- I have a separate /usr partition
- I have an initrd to deal with the separate root partition
- I use LVM to host all my partitions except root and boot
- I have RAID 1 of boot, root and LVM partitions
- I dual boot to Windows 7
Given all this wonderfulness, of course, the out of the box grub 2 does not work.
It seems to think my root partition is my /usr partition which it successfully finds in LVM, when in actual fact, my root partition is a raw, mirrored partition.
So, I had to throw out the entire automated menu list by removing execute permission on
- /etc/grub.d/10_linux
- /etc/grub.d/20_linux_zen
- /etc/grub.d/30_os-prober
and create my own /etc/grub/40_custom, as follows
| Code: | #!/bin/sh
exec tail -n +3 $0
# This file provides an easy way to add custom menu entries. Simply type the
# menu entries you want to add after this comment. Be careful not to change
# the 'exec tail' line above.
echo "Creating Lyalls Custom entries..."
menuentry "Linux" {
set root=(hd2,1)
linux "/boot/kernel-genkernel-x86_64-3.10.7-gentoo-r1" dolvm domdadm raid=noautodetect real_root=/dev/md126 root=/dev/md126 video=uvesafb:ywrap,mtrr:3,1280x1024-32@60
initrd /boot/initramfs-genkernel-x86_64-3.10.7-gentoo-r1
}
menuentry "Windows" {
set root=(hd1,1)
chainloader (hd1,1)+1
}
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This worked. I can chainload from grub legacy to grub 2, the grub 2 menu displays and I can boot Linux, windows also boots.
The fact that my Grub2 menu doesn't seem to include a whole pile of confusing options now, is also an improvement, IMHO.
I am sure I can do all sorts of wonderful things, but less is more. 
I thought I would share.
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...Lyall |
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dmpogo
Advocate
Joined: 02 Sep 2004
Posts: 3267
Location: Canada
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| Posted: Sat Oct 19, 2013 5:12 am Post subject: |
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| At some stage you need to delete legacy grub, otherwise - what's the point ? |
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TomWij
Retired Dev
Joined: 04 Jul 2012
Posts: 1553
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| Posted: Sat Oct 19, 2013 5:36 am Post subject: |
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Yes, have been using 40_custom here too; because well, I haven't yet spend time on trying to fit what I want in the auto detection style.
| dmpogo wrote: | | At some stage you need to delete legacy grub, otherwise - what's the point ? |
Seems like a neat way to make the switch without having to worry about breaking what's already in place. |
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mackal
Tux's lil' helper
Joined: 04 Aug 2011
Posts: 92
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| Posted: Sat Oct 19, 2013 7:02 am Post subject: |
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Read the wiki page.
From what I can tell you need sys-boot/grub:2 device-mapper and then add GRUB_PRELOAD_MODULES=lvm in /etc/default/grub
You will also set GRUB_CMDLINE_LINUX="video=uvesafb:ywrap,mtrr:3,1280x1024-32@60" in /etc/default/grub
If the USE flag change and the PRELOAD thing doesn't do the LVM stuff, you might be able to get it working right adding it to GRUB_CMDLINE_LINUX.
You can also uncomment GRUB_DISABLE_LINUX_UUID=true if you don't want to use UUID. |
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lyallp
Veteran
Joined: 15 Jul 2004
Posts: 1579
Location: Adelaide/Australia
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| Posted: Sat Oct 19, 2013 11:36 pm Post subject: |
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Regarding removing legacy grub, yeah, I plan to, but I think I will leave it there for a bit whilst I continue to experiment with Grub2.
In particular, the wiki page seems to have improved quite significantly since I looked last time.
I will see how I go at tweaking config options, etc, to try make my setup a bit more flexible and move away from the hard coding which I currently have.
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Installing Gentoo
