Subject: re: Looking to make a Sparc bootable cdrom, any instructions?
To: Manuel Bouyer <email@example.com>
From: matthew green <firstname.lastname@example.org>
Date: 10/21/1998 20:50:52
making bootable SPARC & sun3 cdroms is fairly simple. here's the scoop:
the prom treats the cdrom like a normal disk device, so you must provide
a valid sun disklabel on the cdrom, in the normal spot. it does the
normal "boot" thing here too -- given a partition, load the first few
sectors, and run it. the prom has some "smarts" about what partition it
will load by default from a cdrom. eg, partition b is for sun4, c for
sun4c, etc. this includes sun3 & sun3x support. the ultras have a
smarter method that involves a data file on the disk.
so what you need to do is:
- create an "almost" full iso9660 image of whatever you want
to put on the cd (i've used the NetBSD 1.3.2 tree for this).
- get a bootable (floppy) image
- rewrite the iso image with (a) a sun disklabel at the start,
(b) the image at the end, and (c) with the right offset/size
values in the disklabel for the bootloader.
i've done this and it isn't hard. ignatious souvatzis wrote a program
called mksunbootcd that i've hacked on a bit that does all the above
Usage: mksunbootcd [-v] [-c cylsize] cdimage part1 part2...
it rewrites the `cdimage' file, so don't run it multiple times.
(BTW, this is how the sunos4 cdroms work. the solaris 2 ones put
a UFS filesystem in place, rather than an iso one, and boot directly
from the cdrom, rather than via a special kernel).