At power on: (useful reference)
Stop-A : stop the boot process, takes you to OBP ok prompt
Stop-N : reset to default NVRAM values
From go prompt (from article here):
- to enable POST diags, not sent to monitor but sent via serial connection to a terminal or terminal emulator
setenv diag-switch? true
Turn off again with false
- Turn off configured boot drive:
setenv auto-boot? false
true to enable again
- Manually boot from given device:
boot disk
boot cdrom
where disk and cdrom are device aliases that you can view with
devalias