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Notes on turning tomsrtbt El Torito into a Etherboot image:
0. Tomsrtbt (http://www.toms.net/) is an all-purpose rescue and utility
1-floppy Linux system. You can read all about it at the web site. These
notes explain how to turn the El Torito version of it into a netbootable
image for Etherboot. Note that the .img file is not an ISO image, it is
a 2.88M floppy emulation image for writing onto a CD-R(W) with mkisofs.
It's actually a minix filesystem. Inside it are the kernel bz2bzImage
and initrd.bz2.
1. First uncompress the .img:
bunzip2 tomsrtbt-2.0.103.ElTorito.288.img.bz2
2. Mount the image using loopback. You probably need to be root to do
this:
mount -o ro,loop tomsrtbt-2.0.103.ElTorito.288.img /media/floppy
I've specified /media/floppy which is the floppy mount point for my
system, but any convenient directory will do.
3. Copy the kernel image and initrd off it:
cp -p /media/floppy/bz2bzImage /media/floppy/initrd.bz2 .
4. Use mkelf-linux (or mknbi-linux) to make a netbootable image:
mkelf-linux --append='root=100' bz2bzImage initrd.bz2 > tomsrtbt.nb
root=100 means use /dev/ram0 (device 1,0) as the root device.
5. That's it. Clean up by unmounting the .img:
umount /media/cdrom
tomsrtbt.nb can now be loaded with Etherboot. Have fun.
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