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+I have extended mkhybrid to create a CD that is bootable via PPCbug
+on a PowerPC Reference Platform compliant machine (referred to as
+PReP).
+
+This includes a number of IBM RS-6000 clones, along with most of
+Motorola's embedded PowerPC boards, such as the MTX and MVME
+boards. (The motorola boards are sometimes referred to as PowerPlus)
+
+To build a bootable CD, you will first need a kernel image for your
+machine. Put the image somewhere in the filesystem you want
+to generate and ISO9660 image from.
+
+The '-B' or '-prep-boot' flags are used to specify the image file
+to use. The path must be relative to the root of the CD filesytem,
+NOT from the current directory.
+
+For example: to make an image of /tmp/cd and use the image file
+/tmp/cd/zImage, (with rock ridge extensions) use:
+
+mkhybrid -r -B zImage /tmp/cd -o cd.img
+
+Since there are four entries for bootable 'partitions', I have
+allowed up to 4 different images to be used. This might be 
+usefull if one has need of different kernel images for different
+machines on the same CD.
+
+The first image will be in the first partition entry, so if one
+uses:
+
+mkhybrid -r -B zImage1 -B zImage2 -B zImage3 -B zImage4 /tmp/cd
+
+This will result in 4 bootable images. To boot off the first image
+from PPCbug, use 'pboot 0 41' from the ppcbug> prompt.
+(assuming the CDROM is at SCSI ID 4.. replace the 4 with the SCSI
+ID of the CDROM if not.) The second image is at 'pboot 0 42', etc.
+
+There should not be any conflicts with any of the HFS or hybrid
+functions, since the space used by the PReP partition maps is
+unused by anything else. If fact, the goal is to make a CD
+bootable on both Mac's and PReP machines ;)
+
+For any questions contact me at one of the following addresses:
+troy@microux.com
+troy@blacklablinux.com
+hozer@drgw.net