If you boot the operating system, exit it with either the Stop-A or halt commands, and then use some OpenBoot commands, the commands might not work as expected.
For example, suppose you boot the operating system, exit it with Stop-A, then execute the probe-scsi command. You may find that probe-scsi fails, and you may not be able to resume the operating system. When this happens, type the following commands:
ok sync ok boot
To re-execute an OpenBoot command which fails because the operating system has halted, reset the system, then invoke the command, as shown:
ok reset ok probe-scsi ok