panic: trap: fast data access mmu miss

[vezku at surfeu.fi]

> vinum isn't well-tested on sparc64, so it could well have problems.  A
> backtrace might help to identify the culprit.

Yeah, I was thinking about that. I just removed isp and ispfw options from
kernel and I'll test what it does. Someone had similar probs with those
options, so we'll see what happens.

I'll send a backtrace as soon as I have time...

-Vesa, SysAdmin