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Re: grub: support 'guest disks'

From: Marco Gerards
Subject: Re: grub: support 'guest disks'
Date: Thu, 30 Sep 2004 12:37:19 +0000
User-agent: Gnus/5.1006 (Gnus v5.10.6) Emacs/21.3 (gnu/linux)

Yotam Medini <address@hidden> writes:

> Now, when writing the grub menu for H2, while at C1, 
> you end up referring to (hd1,.),
> while you actually want to finally have (hd0,.) when back at H2.
> A nice feature would be, to have an implicit symbol, 
> for the "device-being-booted-by", say 'bd'.

A device name like this could prevent other problems (for example with
weird BIOSes) as well.  Therefore I thought about implementing this
for GRUB 2, not for this reason, but mainly for other reasons I will
explain later in my email.

AFAIK this is how LILO works.  So whenever GRUB does not work and LILO
does, this is most likely the case.  This problem occurs or can occur
in these situations of which some are quite rare:

- When booting from hd1 the hd0 and hd1 are swapped by the BIOS.  In
  that case hd1 is hd0, while it was hd1 at install time.

- Bootable CDROMs.

- USB keys.

Okuji, what is your opinion on this?  I am not a GRUB Legacy/PC BIOS
expert so I might have misunderstood things that went wrong.  The
things I am saying here are mostly things that were told to me on IRC
and not things I experienced myself.


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