Boot Console Interface
Searching for Bootable Media
Where device_type is one of the following:
fwscsi is the built-in fast, wide differential SCSI bus or
the built-in ultra, wide single-ended SCSI bus
sescsi is the built-in single-ended SCSI bus
lan is all connections to the built-in LAN
gscn is an optional FW SCSI interface in slot number n
188