Chainloader question.

[Paulo Cavalcanti]

On Sat, Nov 21, 2009 at 5:39 AM, Erik P. Olsen <epodata at gmail.com> wrote:

> On 20/11/09 23:50, Mikkel wrote:
> > Erik P. Olsen wrote:
> >> Can a 64-bit system be chainloaded from a 32-bit?
> >>
> > What do you mean by chainloaded? If you are talking about a Grub,
> > then it is the same for a 32 or 64 bit version of Fedora. Grub is a
> > boot loader that is independent of the OS installed. (Except for
> > storing its files.)
> >
> My setup is fairly simple. I have a running fedora 10, 32-bit version. I
> have
> build a 64-bit fedora 12 system which I want to chainload using grub from
> F10.
> So far I have only got the answer "Geom error" and I thought that might be
> due
> to the different architectures.
>
>
>
In my case, I had to reinstall grub on the /boot partition of the
chainloaded Fedoras.

First, find out where is /boot:

su -
grub
grub>find /grub/stage1
(hd0,0)
(hd1,1)
(hd2,0)
grub>quit

Then, install it on the /boot partition:

su -
grub
root (hd2,0)
setup (hd2,0)
quit

In my case, I have three disks with F10 x86_64 (hd2), F8 x86_64 (hd1) and
RHEl5 (hd0).

grub is installed on the mbr in hd0 (my RHEL main disk). The other two have
grub on /boot,
the way I showed you. This is my RHEL 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/sda2
#          initrd /initrd-version.img
#boot=/dev/sda
default=2
timeout=15
splashimage=(hd0,0)/grub/splash.xpm.gz
#hiddenmenu
title Red Hat Enterprise Linux Server (2.6.18-164.6.1.el5)
        root (hd0,0)
        kernel /vmlinuz-2.6.18-164.6.1.el5 ro root=LABEL=/ quiet
        initrd /initrd-2.6.18-164.6.1.el5.img
title Red Hat Enterprise Linux Server (2.6.18-164.2.1.el5)
        root (hd0,0)
        kernel /vmlinuz-2.6.18-164.2.1.el5 ro root=LABEL=/ quiet
        initrd /initrd-2.6.18-164.2.1.el5.img
title Fedora 10
        rootnoverify (hd2,0)
        chainloader +1
title Fedora 8
        rootnoverify (hd1,1)
        chainloader +1
title Windows XP
        map (hd0,0) (hd1,0)
        map (hd1,0) (hd0,0)
        rootnoverify (hd1,0)
        chainloader +1
title Memtest86+ (2.11)
        root (hd0,0)
        kernel --type=netbsd /elf-memtest86+-2.11


The disk with F8 will receive F12 soon, and the disk with F10 will receive
F14, and so on...

I hope this helps.

-- 
Paulo Roma Cavalcanti
LCG - UFRJ
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