powerpc: Kernel panic on install

[msplsh]

I'm having a problem installing on a PowerMac3,1 400Mhz where I trigger this patch.

[base] Revision 297466

svnweb.freebsd.org

svn commit: r309148 - head/sys/kern

It panics with "timed sleep before timers are working" and reboots immediately. Had to use a slo-mo camera to even see the message.

I'm installing from a CD that is hooked up via FireWire.

Any ideas?