openwrt/openwrt/target/default/target_skeleton/etc/preinit

#!/bin/sh
[ "$(/usr/sbin/nvram get boot_wait)" != "on" ] && {
	/usr/sbin/nvram set boot_wait=on
	/usr/sbin/nvram commit
}
mount none /proc -t proc
insmod diag
echo 0x01 > /proc/sys/diag
sleep 1
if [ $(cat /proc/sys/reset) = 1 ] || [ "$(/usr/sbin/nvram get failsafe)" = 1 ]; then
  export FAILSAFE=true
  while :; do { echo $(((X=(X+1)%8)%2)) > /proc/sys/diag; sleep $((X==0)); } done &
fi
/sbin/mount_root ${FAILSAFE:+failsafe}

exec /sbin/init