Enabling the debug boot image

1. Back in the SSH console session window, wait for the Open Firmware prompt "0>"
At the 0> prompt, enter "boot -s verbose"

2. For cdrom boot debug enter:
0> boot cdrom:\ppc\chrp\bootfile.exe -s verbose

At this point, the LPAR will continue to boot and debug information will be sent to the console. While the LPAR is booted in this debug state, all commands that are run will output debug information, such as exec() system calls.