Booting freebsd on a powermac g4 from a CD

[Jukka Ukkonen]

Hello all,

What might be the current official method or at least known
working method for booting FreeBSD on a PowerMac G4 from a CD?

After 10.1 update my installed kernel hangs after probing
gem0. When the MAC address has been displayed there is no
more output, and the boot time autoconfig never proceeds
any further.
Now I would like to try booting an alternate (probably also
older) version of FreeBSD from CD to try to fix the system.
The old examples I have found for booting from CD do not seem
to work.

--jau