build: use genimage tool to create sd image

Signed-off-by: carbon <carbon@milkv.io>

build/Makefile

@@ -580,6 +580,19 @@ ifneq ($(STORAGE_TYPE), sd)
 endif
 endif
 
+sd_image:
+	$(call print_target)
+	-${Q}rm  $(OUTPUT_DIR)/fs
+ifeq ($(CONFIG_BUILDROOT_FS),y)
+	${Q}rm -rf $(OUTPUT_DIR)/br-rootfs
+	${Q}ln -s $(OUTPUT_DIR)/br-rootfs $(OUTPUT_DIR)/fs
+	${Q}mkdir $(OUTPUT_DIR)/br-rootfs
+	${Q}tar xvf $(BR_DIR)/output/$(BR_BOARD)/images/rootfs.tar.xz -C $(OUTPUT_DIR)/br-rootfs
+else
+	${Q}ln -s $(OUTPUT_DIR)/rootfs $(OUTPUT_DIR)/fs
+endif
+	$(TOP_DIR)/device/gen_burn_image_sd.sh $(OUTPUT_DIR)
+
 jffs2:
 	$(call print_target)
 ifeq ($(STORAGE_TYPE),spinor)

build/common_functions.sh

@@ -265,6 +265,13 @@ function pack_burn_image
   popd
 )}
 
+function pack_sd_image
+{(
+  pushd "$BUILD_PATH"
+  make sd_image || return "$?"
+  popd
+)}
+
 function pack_prog_img
 {(
   local tmp_dir