openwrt-xburst/target/default/target_skeleton/etc/preinit

#!/bin/sh
# executed from squashfs before init to 
# transfer root to the jffs2 partition
mount none /proc -t proc
insmod diag
echo 0x01 > /proc/sys/diag
sleep 1
if [ $(cat /proc/sys/reset) = 1 ] ; then
  export FAILSAFE=true
  while :; do { echo $(((X=(X+1)%8)%2)) > /proc/sys/diag; sleep $((X==0)); } done &
else
  mtd unlock mtd4
  mount -t jffs2 /dev/mtdblock/4 /jffs
  pivot_root /jffs /jffs/rom
  mount none /dev -t devfs
  mount none /proc -t proc
  umount rom/proc
fi
mount none /tmp -t ramfs
exec /sbin/init