http://docs.sun.com/source/820-2383-14/index.html#0_27275
http://forums.sun.com/thread.jspa?threadID=5345963
To Install the OS From a USB DVD Drive
1. Connect the USB DVD drive.
2. Identify the USB device path at the OpenBoot PROM level from output from the show-disks command:
{0} ok show-disks
a) /[email protected]/[email protected]/[email protected]/LSILogic,[email protected]/disk
b) /[email protected]/[email protected]/[email protected]/[email protected]/[email protected],2/[email protected]/disk <========
q) NO SELECTION
Enter Selection, q to quit: q
{0} ok
3. At the ok prompt, boot from the DVD drive to proceed with the Solaris OS install:
{0} ok boot /[email protected]/[email protected]/[email protected]/[email protected]/[email protected],2/[email protected]/disk:f