source: freewrt/package/base-files/default/sbin/mount_root@ 28df043

#!/bin/sh
is_dirty() {
        grep Broadcom /proc/cpuinfo >&- || return 1
        OFFSET="$(($(hexdump -v /dev/mtdblock/1 -s 20 -n 2 -e '"%d"')-1))"
        return $(hexdump -v /dev/mtdblock/1 -s $OFFSET -n 1 -e '"%d"')
}

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

if [ "$1" != "failsafe" ]; then 
        mtd unlock linux
        mount | grep jffs2 >&-
        if [ $? = 0 ] ; then
                if [ $(cat /proc/mtd | wc -l) = 6 ]; then
                        mtd erase data
                        jffs2root --move --reboot
                else
                        mount -o remount,rw /dev/root /
                fi
        else
                . /bin/firstboot
                is_dirty 
                [ $? != 0 ] && {
                        echo "switching to jffs2"
                        mount /dev/mtdblock/4 /jffs -t jffs2
                        pivot /jffs /rom
                } || {
                        echo "jffs2 unusable; using ramdisk"
                        ramoverlay
                }
        fi
fi

mount none /tmp -t tmpfs -o remount,nosuid,nodev,mode=1777
mkdir -p /dev/pts
mount none /dev/pts -t devpts
mount -t sysfs none /sys 2>&-