Re: Grub & CD

[tlaronde]

En réponse à Chris Lingard <address@hidden>:

> On Tuesday 08 July 2003 1:47 pm, Treutwein Bernhard wrote:
> 
> >
> > But, as far as I understand Leonid's posting, it should work,
> > when having it on a CD in no-emulation mode.
> 
> Guess I am going to have to read the archives and google a lot.
> 
> I have a method of running lilo on a 2.88Mb image and using that
> as the -b  boot.img, but am hoping to prune it to 1.44Mb
> 
> I was under the impression that if I make a grub boot floppy, copy it
> to a 1.44Mb file; and use this as the -b boot.img,  this would work
> 
> I thought that the BIOS read the whole image  kernel/initrd from the
> CD when set to boot from CD.  I am not too sure how to use grub
> to make the jump, so that the BIOS passes control to grub.

The problem with GRUB (at the present) is that the El Torito emulation
works with LBA able devices _but_ the emulation is CHS based i.e. when
GRUB stage1 is loaded it detects that the device is LBA able and
switch to LBA and is unable to read an image which must be treated as
a CHS device.

I have made patches for all of this, including for the support of non
standard floppy formats (1.60 and so on) but the patches applie to
0.92 and I have no time/will to update them once more to follow the
new version (it should not be very difficult, this is just a matter of
adjusting the offset of the diffs actually).

There is also a script written by Robert Millan and me and called
`mkbimage' which should be in the GRUB sources and is presently here :

http://corpus.polynum.org/admin/mkbimage

The patches are here:

http://alpha.polynum.org/misc/

HTH