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<H1>[Mageia-dev] Grub2 vs. Grub Legacy in M3</H1>
<B>Barry Jackson</B>
<A HREF="mailto:mageia-dev%40mageia.org?Subject=Re%3A%20%5BMageia-dev%5D%20Grub2%20vs.%20Grub%20Legacy%20in%20M3&In-Reply-To=%3C5106FDE4.2050508%40zen.co.uk%3E"
TITLE="[Mageia-dev] Grub2 vs. Grub Legacy in M3">zen25000 at zen.co.uk
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<I>Mon Jan 28 23:38:28 CET 2013</I>
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<PRE>On 28/01/13 20:01, Felix Miata wrote:
><i> On 2013-01-28 19:27 (GMT) Barry Jackson composed:
</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>
</I>>><i> Chainloading into grub2 is not the best way, due to the block lists
</I>>><i> problem people keep mentioning and complaining about.
</I>>><i> Grub2 can install it's kernel in the root filesystem which can be booted
</I>>><i> directly. Installing the grub2 package, whether during install or later
</I>>><i> automatically builds /boot/grub/i386-pc/core.img and also creates a
</I>>><i> grub.cfg ready for use.
</I>>><i> Chanloading is un-necessary since an entry in menu.lst on a legacy
</I>>><i> system will boot a grub2 Mageia system using:
</I>><i>
</I>>><i> title Mageia via GRUB 2
</I>>><i> root (hdx,y)
</I>>><i> kernel /boot/grub2/i386-pc/core.img
</I>><i>
</I>>><i> ...as explained in the above README.Mageia
</I>><i>
</I>>><i> I use a small grub2 partition sda1 as "master".
</I>>><i> To boot into Mageia grub2 systems I use the grub2 multiboot command:
</I>><i>
</I>>><i> menuentry 'Mageia-3 multi sda6' {
</I>>><i> search --no-floppy --label --set=root mageia-3
</I>>><i> multiboot /boot/grub2/i386-pc/core.img
</I>>><i> }
</I>><i>
</I>>><i> So IMO all of the FUD about "you can't install grub2 to the PBR" is
</I>>><i> pointless since it's just not necessary.
</I>><i>
</I>><i> Maybe not all is FUD. I don't see anything in that README that describes
</I>><i> a procedure for an OS/2 or eCS multibooter whose primary bootloader
</I>><i> and/or bootloader of choice is IBM Boot Manager, which is prerequisite
</I>><i> to booting OS/2 when it is installed to a logical partition (the only
</I>><i> place I've ever installed it in the past decade). It can't be told to
</I>><i> load a particular file on a partition, only its PBR via the simple
</I>><i> process of selecting a partition in its setup utility for inclusion in
</I>><i> its boot menu. It works (in effect, chainloads) fine for partitions on
</I>><i> which Grub Legacy has been configured with the Grub Legacy setup
</I>><i> command. The only options I see for such users is selecting a partition
</I>><i> with Grub Legacy configured with menu.lst stanza(s) that include
</I>><i> core.img, or configuring IBM BM as a secondary bootloader to a primary
</I>><i> bootloader that is not installed on the MBR.
</I>
Maybe.
I have no OS/2 systems to test with.
I think grub2 can be forced to write to the PBR (but I can't find it
documented just now).
Maybe you could investigate and test this and suggest an edit to the
README ?
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