> Changing root device to sd1a.
> PRAM: Battery clock has earlier time than UNIX fs.

This isn't as bad as it seems, and certainly isn't the cause of the
panic you are experiencing.

> <nothing happens for a while; hit the Return key>
> 
> panic: kernl jump to zero
> Stopped at      _Debugger+0x6:    unlk    a6
> db>

Hmm, this sounds a bit familiar to me.... Just to make sure: You've
checked out the FAQ, haven't you?  It doesn't sound exactly like one
of them, though...

ken