diff --git a/build/build_flash_kl3.sh b/build/build_flash_kl3.sh
index 5ecbc0a..3d4bb4a 100755
--- a/build/build_flash_kl3.sh
+++ b/build/build_flash_kl3.sh
@@ -953,6 +953,7 @@ build_obj_func() {
             #     ./make.py -j APP=${APP_SELECTION} -C .. clobber
             # fi
             # ./make.py -j PLATFORM=${DEF_PLATFORM_TYPE} cco=1 APP=${APP_SELECTION} FLASH_SIZE=${FLASH_SIZE_nM} -C ..
+            ./make.py -j APP=${APP_SELECTION} -C .. creat_src_file
             build_use_ninja ${DEF_PLATFORM_TYPE} ${APP_SELECTION} ${FLASH_SIZE_nM}
             if [ "${APP_SELECTION}" == "${DEF_CUS_APP}" ]; then
                 #kl3 customer demo, cus_core.
diff --git a/build/makefile.cfg b/build/makefile.cfg
index a3c466f..8318dc7 100644
--- a/build/makefile.cfg
+++ b/build/makefile.cfg
@@ -84,8 +84,8 @@ SRCS        += $(EXT_SRC)
 # all the obj names
 OBJECTS	    = $(addprefix $(BIN_DIR)/, $(patsubst %.S, %.o, $(patsubst %.c, %.o, $(patsubst %.cpp, %.o, $(SRCS)))))
 
-$(shell echo $(SRCS) > "src_files.txt")
-$(shell echo $(ADD_INCLUDE) >> "src_files.txt")
+# $(shell echo $(SRCS) > "src_files.txt")
+# $(shell echo $(ADD_INCLUDE) >> "src_files.txt")
 endif
 
 PLATFORM    ?= FPGA
@@ -422,6 +422,17 @@ clean:
 clobber:
 	@echo clobber
 
+creat_src_file:src_files.txt
+
+src_files.txt:
+	@echo $(SRCS) > "src_files.txt"
+	@echo $(ADD_INCLUDE) >> "src_files.txt"
+	@for d in $(SUB_DIRS) ; do\
+		if [ -e "$$d/Makefile" ]; then\
+			$(MAKE) -C $$d $@ ;\
+		fi;\
+	done
+
 # clean obj files only
 clean_objs:
 	-$(RM) $(OBJECTS)
diff --git a/clear_output.py b/clear_output.py
index 27d6e75..c0913c3 100644
--- a/clear_output.py
+++ b/clear_output.py
@@ -15,6 +15,10 @@ def clear(dir_path:str,rm_dir:str):
                 shutil.rmtree(path)
             else:
                 clear(path,rm_dir)
+        elif os.path.isfile(path):
+            if item == rm_dir:
+                print('remove: ',path)
+                os.remove(path)
 
 
 
@@ -22,4 +26,5 @@ def clear(dir_path:str,rm_dir:str):
 
 if __name__ == "__main__":
     clear('../','.output')
+    clear('../','src_files.txt')