Ok lets see if we can force it to reconfigure /devives and /dev
This makes sure the file system is read/write
mount -f ufs -o remount,rw,nologging /devices/ramdisk:a /
Commands to reconfigure dev and devices
/usr/sbin/drvconfig
/usr/sbin/devlinks
/usr/sbin/disks
/usr/sbin/ports
/usr/sbin/tapes
/usr/sbin/audlinks
/usr/sbin/devfsadm -C
init 6
Hopefully this will force picking up the AMD processor.