Since machines vary greatly in the way their devices are connected, there are aliases defined by the firmware. You can either use the fully qualified Open Firmware path of a device node, or the alias.
The secondary boot loader,
ofwboot, takes
boot commands virtually the same as Open Firmware. Thus, the following examples apply equally to
ofwboot as well as Open Firmware.
A typical list of usable boot devices (extracted from the output of the Open Firmware command
devalias) is:
net /sbus/SUNW,hme@e,8c00000
disk /sbus/SUNW,fas@e,8800000/sd@0,0
cdrom /sbus/SUNW,fas@e,8800000/sd@6,0:f
disk6 /sbus/SUNW,fas@e,8800000/sd@6,0
disk5 /sbus/SUNW,fas@e,8800000/sd@5,0
disk4 /sbus/SUNW,fas@e,8800000/sd@4,0
disk3 /sbus/SUNW,fas@e,8800000/sd@3,0
disk2 /sbus/SUNW,fas@e,8800000/sd@2,0
disk1 /sbus/SUNW,fas@e,8800000/sd@1,0
disk0 /sbus/SUNW,fas@e,8800000/sd@0,0
If a device specification includes a partition letter (for example
cdrom in above list), that partition is used by default, otherwise the first (a) partition is used. If booting from the net device, there is no partition involved.
The boot device is an optional first part of the boot string, if no device is specified the default device is used (see below).