mfs /tmp won't mount

-current as of Dec 30 13:38 gmt

i have kernel conf

    device		md		# Memory "disks"

i have /etc/fstab

    /dev/ad0s3b	none	swap	sw		0	0
    ...
    /dev/ad0s3b	/tmp	mfs	-s131072,rw,nosuid,nodev,noatime

at boot, it can not mount /tmp, complaining there is no
/dev/rad0s3b
     ^
due to the devfs changes, i am not yet smart enough to debug this.
any clues?

randy