this is obsolete doc -- see http://doc.nethence.com/ instead

How to use the ok prompt 

Initialize the firmware with the factory defaults, 

set-defaults

disable autoboot and reset, 

printenv

setenv auto-boot? false

reset-all

Note. On SUN4M boxes it's simply, 

reset

Look for devices, 

probe-scsi

probe-scsi-all

showdevs

show-disks

show aliases or "shortcuts", 

devalias

Boot with the cdrom, 

boot cdrom

or boot with the default disk, 

boot disk

or boot with the first or second disk, 

boot disk0

#boot disk1

Power off the system, 

power-off

Refs. 

OK Prompt  

http://jeeva.us/Sun/OKPrompt