Use mdev to automatically generate the device node

in the init script, e.g: rc.local

cat etc/init.d/rcS

#!/bin/sh

mount -o sys /sys

mount -o proc /proc

echo "----------mount /sys as sysfs"

mount -t tmpfs mdev /dev

echo "----------Starting mdev......"

echo /sbin/mdev > /proc/sys/kernel/hotplug

mdev -s