how do I boot a cd from a grub command prompt?

mangolicious · 12-13-2005, 10:04 AM

I am trying to boot an ubuntu live cd on an old computer that can't boot cds. So I thought, "Why don't I just make a grub boot diskette and boot the cd with it?" Apparently it is not so simple.

by default, grub can only access cdroms if you are booting grub from a cdrom using stage2_eltorito. Obviously, that is not an option in this case. So my question is how do I get grub to access cdroms only using a floppy disk?

PTrenholme · 12-13-2005, 10:30 AM

Did you try a simple root (cd,0) in your floppy boot menu for the cd? Perhaps you need the rootnoverify (cd,0) and chainloader +1 options?

(Just guessing here, never tried it. Oh, maybe root (cd) is all that's needed. In any case, since the CD has it's own boot loader, I suspect that you want GRUB to use it, via chainloader.)

mangolicious · 12-14-2005, 07:46 AM

Yeah that's the idea. the command would look something like this:

Code:

rootnoverify (cd,0)
chainload +1

But I am not sure if the (cd,0) device is made available in the regular grub boot floppy. I will try it though.

mangolicious · 02-12-2006, 07:17 PM

no, the (cd,0) device isn't enabled at all. I am sure.