After some adventure updating my source trees [everything to -current
and the PPC-based ports (except pmppc) to "ppcoea-renovation"], I've
managed to build a fresh release for prep and update my setup.

It still hangs probing esiop.  Before that, wdc0 (slide0) reported
"lost interrupt" much as I had seen previously on macppc.  I think I
updated after the most recent change to "powerpc/pic/intr.c".  I have
v1.1.2.18, 04:47:11 2007/09/07.  I suspect that on prep the problem lies
elsewhere.

The log of my latest boot attempt is at:

     http://bobdbob.com/~jdbaker/mtx-ppcoea.log

--
John D. Baker                            NetBSD     Darwin/MacOS X
http://mylinuxisp(dot)com/(tilde)jdbaker/     OpenBSD            FreeBSD
BSD.  It just sits there and _works_.
GPG fingerprint = D703 4A7E 479F 63F8 D3F4  BD99 9572 8F23 E4AD 1645