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