Beep or visual signal after booting OpenBSD/sparc64

Hi everybody,

I've setup a firewall/router on a SunFire v100 using OpenBSD/sparc64
(version 4.5)

Since it's a headless system (all management done via serial port), is
there a way to play a "signal" when the system has finished its
booting sequence, to inform me that services are up and running?
Ideally, it would be a beep sound, but basically any audible or
visible signal is ok for me.

Until now, I've tried various "hacks" :

- shell script ( "\a" in C)
- access to audio system (but the v100 does not seem to have an
internal "speaker" like those I'm more familiar in PC)
- visual signal (there are two alarms linked to green lights in the
front case that can be set in LOM but I understand they are not
accessible within OpenBSD).

Any ideas or suggestions will be most welcome! Thanks in advance,

Hans.