mk_mmc.sh: build the dd command up

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

hwpack/A10-OLinuXino-Lime.conf

@@ -10,8 +10,11 @@ conf_bl_listfile="bootloader-ng"
 conf_boot_fstype="ext2"
 
 bootloader_location="dd_uboot_boot"
-dd_uboot_bs="1024"
+uboot_name="u-boot.sunxi"
+dd_uboot_count=
 dd_uboot_seek="8"
+dd_uboot_conf="fsync,notrunc"
+dd_uboot_bs="1024"
 unset spl_name
 boot_name="u-boot.sunxi"
 

hwpack/A20-OLinuXino-Lime.conf

@@ -10,8 +10,11 @@ conf_bl_listfile="bootloader-ng"
 conf_boot_fstype="ext2"
 
 bootloader_location="dd_uboot_boot"
-dd_uboot_bs="1024"
+uboot_name="u-boot.sunxi"
+dd_uboot_count=
 dd_uboot_seek="8"
+dd_uboot_conf="fsync,notrunc"
+dd_uboot_bs="1024"
 unset spl_name
 boot_name="u-boot.sunxi"
 

mk_mmc.sh

@@ -923,11 +923,30 @@ sfdisk_partition_layout () {
 }
 
 dd_uboot_boot () {
-	#For: Freescale: i.mx5/6 Devices
 	echo ""
 	echo "Using dd to place bootloader on drive"
 	echo "-----------------------------"
-	dd if=${TEMPDIR}/dl/${UBOOT} of=${media} seek=${dd_uboot_seek} bs=${dd_uboot_bs}
+
+	unset dd_uboot
+	if [ ! "x${dd_uboot_count}" = "x" ] ; then
+		dd_uboot="${dd_uboot}count=${dd_uboot_count} "
+	fi
+
+	if [ ! "x${dd_uboot_seek}" = "x" ] ; then
+		dd_uboot="${dd_uboot}seek=${dd_uboot_seek} "
+	fi
+
+	if [ ! "x${dd_uboot_conf}" = "x" ] ; then
+		dd_uboot="${dd_uboot}conv=${dd_uboot_conf} "
+	fi
+
+	if [ ! "x${dd_uboot_bs}" = "x" ] ; then
+		dd_uboot="${dd_uboot}bs=${dd_uboot_bs}"
+	fi
+
+	echo "${uboot_name}: dd if=${uboot_name} of=${media} ${dd_uboot}"
+	echo "-----------------------------"
+	dd if=${TEMPDIR}/dl/${UBOOT} of=${media} ${dd_uboot}
 	bootloader_installed=1
 }