let parted set boot flag over fdisk

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>

mk_mmc.sh

@@ -372,7 +372,7 @@ NUM_MOUNTS=$(mount | grep -v none | grep "$MMC" | wc -l)
   sudo umount ${DRIVE} &> /dev/null || true
  done
 
- sudo parted -s ${MMC} mklabel msdos
+ sudo parted --script ${MMC} mklabel msdos
 }
 
 function create_partitions {
@@ -383,8 +383,6 @@ p
 1
 1
 +64M
-a
-1
 t
 e
 p
@@ -393,6 +391,8 @@ END
 
 sync
 
+sudo parted --script ${MMC} set 1 boot on
+
 echo ""
 echo "Formating Boot Partition"
 echo ""