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<H1>[Mageia-dev] Grub2 vs. Grub Legacy in M3</H1>
<B>Frank Griffin</B>
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TITLE="[Mageia-dev] Grub2 vs. Grub Legacy in M3">ftg at roadrunner.com
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<I>Mon Jan 21 01:01:30 CET 2013</I>
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<PRE>On 01/20/2013 02:58 PM, Maurice Batey wrote:
><i> On Sun, 20 Jan 2013 20:04:32 +0200, Thomas Backlund wrote:
</I>><i>
</I>>><i> <A HREF="http://svnweb.mageia.org/packages/cauldron/grub2/current/SOURCES/README.Mageia?view=markup">http://svnweb.mageia.org/packages/cauldron/grub2/current/SOURCES/README.Mageia?view=markup</A>
</I>><i> Many thanks, Thomas!
</I>><i>
</I>Look, I don't don't want to restate the obvious, but you *do* realize
that in order for chainloader to work, you actually have to install the
secondary bootloader on the PBR of its owing partition ? You can't just
have installed grub on your MBR at some point in the past, then install
grub2 (or anything else, for that matter) on the MBR again, and expect
your original partitions to boot ?
In MGA install terms, and specific to the case of grub2 on the MBR
trying to boot grub on a PBR, you have to boot the grub partition (or do
the boot-elsewhere/chroot thing), modify the /boot/grub/install.sh to
not target the MBR (stage2=(hd0)) but indicate the PBR (stage2=(hd0,x))
and rerun install.sh to install grub on the PBR.
In terms of the install paradigm, you have to choose to install the
bootloader to the PBR (sdaX) rather than the MBR (sda). Otherwise, when
the MBR bootloader, whether grub2 or grub, boots and chains to the PBR
of the desired partition, there won't be anything there in the PBR to boot.
If you need clarification on this, ask, and give specifics. The
objective of chainloading is to have each PBR (partition) behave as if
it is its own MBR. If you try to point grub2 menu entries to native
partiton grub files, or vice versa, you are just asking for trouble.
The clean way to do it is to use chainloading to link the MBR (whatever
it is) to the PBR (whatever it is), and let the PBR do the bootloading
for its own partition according to its own needs.
If you do it this way, you can install whatever you want as a bootloader
on the MBR, and each partition can have whatever BIOS-compliant
bootloader it wants, including grub, grub2, lilo, OS/2, DOS, or Wndows.
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