ar71xx: scan nand ubi partition for ath9k eeprom files

The MR18 stores the ath9k eeprom values on the NAND.
This patch makes it possible to retrieve the images
from there.

Signed-off-by: Chris R Blake <chrisrblake93@gmail.com>

SVN-Revision: 47948

package/base-files/files/lib/functions/system.sh

@@ -41,6 +41,23 @@ mtd_get_mac_binary() {
 	dd bs=1 skip=$offset count=6 if=$part 2>/dev/null | hexdump -v -n 6 -e '5/1 "%02x:" 1/1 "%02x"'
 }
 
+mtd_get_mac_binary_ubi() {
+	local mtdname="$1"
+	local offset="$2"
+
+	. /lib/upgrade/nand.sh
+
+	local ubidev=$(nand_find_ubi $CI_UBIPART)
+	local part=$(nand_find_volume $ubidev $1)
+
+	if [ -z "$part" ]; then
+		echo "mtd_get_mac_binary: ubi volume $mtdname not found!" >&2
+		return
+	fi
+
+	hexdump -v -n 6 -s $offset -e '5/1 "%02x:" 1/1 "%02x"' /dev/$part 2>/dev/null
+}
+
 mtd_get_part_size() {
 	local part_name=$1
 	local first dev size erasesize name