openwrtv3/package/base-files/files/sbin/mount_root

#!/bin/sh
# Copyright (C) 2006 OpenWrt.org
. /etc/functions.sh

mount none /proc -t proc
size=$(awk '/Mem:/ {l=5242880;print((s=$2/2)<l)?$2-l:s}' /proc/meminfo)
mount none /tmp -t tmpfs -o size=$size,nosuid,nodev,mode=1777

grep rootfs /proc/mtd >/dev/null 2>/dev/null && {
	mtd unlock rootfs
	grep rootfs_data /proc/mtd >/dev/null 2>/dev/null && {
		. /bin/firstboot
		echo "switching to jffs2"
		mount "$(find_mtd_part rootfs_data)" /jffs -t jffs2
		fopivot /jffs /rom
	}
} || mount -o remount,rw /dev/root /

mkdir -p /dev/pts
mount none /dev/pts -t devpts
grep sysfs /proc/filesystems >/dev/null && mount -t sysfs none /sys 2>&-