[Sunhelp] I can't boot to single-user mode(use boot -s)!

[Jackey Cheung]

Hi!
  I can't boot to single-user mode by use command 'boot -s' in ok prompt,
the system will boot from network when i press <Enter> key,why?
  Thank you.
            Jackey Cheung
            jackeych at netease.com
            7/7/00