flashrd ramdisk

Contains /dev and only enough binary to bootstrap vnd image
Ramdisk has no way of knowing which disk was booted from

Bootstrap routine: /stand/rc

for i in sd3a sd2a sd1a sd0a wd3a wd2a wd1a wd0a; do
 if mount -o rdonly /dev/$i /flash >/dev/null 2>&1; then
  if test -f /flash/openbsd.vnd; then
   disk=$i
  ...
 fi
done
...
if ! mount -o noatime,nodev,nosuid /dev/$disk /flash; then
 echo bootstrap: fatal error mounting $disk to /flash
 exit 1
fi

mkvndmnt /flash