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