Ok, I think I've determined the cause of the evil spurious machine checks
when probing non-existent PCI devices.

Oh yay, I love buggy core logic.

New images:

	ftp.netbsd.org:/ftp/pub/incoming/thorpej/disk1of2
	ftp.netbsd.org:/ftp/pub/incoming/thorpej/disk2of2
	ftp.netbsd.org:/ftp/pub/incoming/thorpej/netbsd-GENERIC-Sable

Note, still requires serial console.

Please send me a COMPLETE log of the boot sequence if you try these.

Thanks!

        -- Jason R. Thorpe <thorpej@nas.nasa.gov>