diff --git a/mk_mmc.sh b/mk_mmc.sh
index 6721154..8204762 100755
--- a/mk_mmc.sh
+++ b/mk_mmc.sh
@@ -941,10 +941,16 @@ unmount_all_drive_partitions () {
 		umount ${DRIVE} >/dev/null 2>&1 || true
 	done
 
+	if [ ! "x${conf_smart_uboot}" = "xenable" ] ; then
+		count="100"
+	else
+		count="70"
+	fi
+
 	echo "Zeroing out Partition Table"
-	dd if=/dev/zero of=${media} bs=1M count=108 || drive_error_ro
+	dd if=/dev/zero of=${media} bs=1M count=${count} || drive_error_ro
 	sync
-	dd if=${media} of=/dev/null bs=1M count=108
+	dd if=${media} of=/dev/null bs=1M count=${count}
 	sync
 }
 
@@ -1301,7 +1307,11 @@ process_dtb_conf () {
 
 	#defaults, if not set...
 	conf_boot_startmb=${conf_boot_startmb:-"1"}
-	conf_boot_endmb=${conf_boot_endmb:-"96"}
+	if [ ! "x${conf_smart_uboot}" = "xenable" ] ; then
+		conf_boot_endmb=${conf_boot_endmb:-"96"}
+	else
+		conf_boot_endmb=${conf_boot_endmb:-"64"}
+	fi
 	conf_root_device=${conf_root_device:-"/dev/mmcblk0"}
 
 	#error checking...