I came to this late and missed most of the thread so apologies if this
has been covered.

Did you mount /proc into /mnt/gentoo before chroot'ing? (see install
docs) This allows grub to correctly "sense" the drive map for writing
the boot sectors.

Some early MB's changed the drive map depending on what disk/media
(i.e., cdrom) you booted from so grub wrote a correct map at the time,
then the MB changed the mapping on the HD boot.  Fix was to
intelligently guess the correct drive and write it manually using grub.
A later bios update allowed some control at the bios level which made it
easier.

Billk


On Wed, 2007-11-14 at 18:36 -0800, maxim wexler wrote:
> > Grub can perfectly from a floppy disk. See "info
> > grub" (the full grub
> > documentation, the man page is crap) in order to
> > learn how to create a
> > grub floppy disk (or CD/R(W)). You will then be able
> > to set the BIOS
> > boot order to default and see what a freshly booted
> 
> Arrgh! Now I learn this box won't boot from a floppy!
> 
> It bipasses the floppy completely unless I disable ALL
> the drives except the floppy and then I get:
> 
> Invalid boot diskette: insert BOOT disk in A:\
> 
> Huh? Maybe it's because this is a Dell PIII and
> requires a proprietary DOS boot disk. 
> 
> There seems to be two methods from what I can find on
> the Web: copying menu.lst to /mnt/floppy/boot/grub and
> copying /boot/grub/stage1 and /boot/grub/stage2 to a
> floppy I tried them both without success.
> 
> Of course I can still boot the gentoo-install CD but
> then I have to chroot to run grub which puts me back
> in the hole. 
> 
> Now, I don't have a burner on the PIII, but I have one
> on another box. Can someone suggest a method to burn a
> grub-boot CD that won't leave me with a coaster -- got
> plenty of those :(
> 
> -mw
> 
> 
>       
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