RE: panic on boot

> The patch exists that modifies BTX to reflect interrupts and requests into
> the real mode, see
> http://people.freebsd.org/~kib/realbtx/
> http://people.freebsd.org/~kib/realbtx/realbtx.2.patch
> 
> You would need to either somehow inplant supplied loader into your CD
> image, or rebuild the whole installation CD with patch applied. Again,
> I cannot guarantee that the patch is relevant for your problem.

Despite you couldn't guarantee it, it really helped and it boots now.
I've used the binary loader available from ~kib site and just replaced
it on the original ISO: mdcondifig -> mount ->
tar cf - | (cd elswhere && tar xvpf -) -> replace the loader -> mkisomages.sh

Thanks a lot,
Petr