#!/bin/sh
ARTMTD=$(grep \"ART\" /proc/mtd | awk -F ':' '{print $1}')
BAKMTD=$(grep \"ART.bak\" /proc/mtd | awk -F ':' '{print $1}')
validlen=65536
hwid_len=34

is_valid_board_parameter()
{
	[ "$(dd if=$1 bs=1 count=$hwid_len skip=41 2>/dev/null | cat)" != "$(cat /hw_id)" ] && return 255
	# add other check here if necessary
	return 0
	# Note: return 0 means true, return other value means false
}

if [ "x$BAKMTD" = "x" ]; then
	echo "Not find ART.bak mtd partition"
	exit
fi

nanddump /dev/$ARTMTD -l $validlen -f /tmp/$ARTMTD 2>/dev/null
nanddump /dev/$BAKMTD -l $validlen -f /tmp/$BAKMTD 2>/dev/null
if is_valid_board_parameter /tmp/$ARTMTD
then
	if diff -q /tmp/$ARTMTD /tmp/$BAKMTD > /dev/null
	then
		echo "board parameter in $ARTMTD and $BAKMTD partition are same and valid"
	else
		echo "backup board parameter from $ARTMTD to $BAKMTD partition"
		nandwrite -p -m -q /dev/$BAKMTD /tmp/$ARTMTD
	fi
else
	if is_valid_board_parameter /tmp/$BAKMTD
	then
		echo "restore board parameter from $BAKMTD to $ARTMTD partition"
		nandwrite -p -m -q /dev/$ARTMTD /tmp/$BAKMTD
	else
		echo "!!! board parameter in $ARTMTD and $BAKMTD partition both are invalid"
	fi
fi
rm -f /tmp/$ARTMTD /tmp/$BAKMTD