Re: Booting grub from CD

[Jochen Hoenicke]

On Jul 22, Peter Schuller wrote:
> Hello,
> 
> I hate floppies ;) Hence, I'd like to make a grub boot-CD. 

IIRC it is safest to make a 1.44MB grub floppy image and use that as
boot image for CD.  Other schemes may depend on the BIOS.  Grub asks
the BIOS for the geometry of the boot image via standard BIOS call
int13 ah=8.  Not all bioses provide correct geometry when booting via
cdrom or zip drive though.

I have a patch that makes grub look for geometry information in the
bootsector just as DOS/Windows does it.  The patch isn't perfect, yet,
since it doesn't provide a way to set this information if it's not
already present.  Nonetheless it works if the boot disk has a FAT
image, as mkdosfs or DOS format fill in the correct geometry
information.  The patch is at the savannah patch manager or at
 http://www.informatik.uni-oldenburg.de/~delwi/grub/ 
There is also a CVS snapshot from June, but I think the patch should
still apply to grub-0.90.

  Jochen