diff --git a/board/esd/hh405/Makefile b/board/esd/hh405/Makefile
index fdae010..0507f1b 100644
--- a/board/esd/hh405/Makefile
+++ b/board/esd/hh405/Makefile
@@ -5,30 +5,11 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-include $(TOPDIR)/config.mk
 ifneq ($(OBJTREE),$(SRCTREE))
 $(shell mkdir -p $(obj)../common)
 endif
 
-LIB	= $(obj)lib$(BOARD).o
-
-COBJS	= $(BOARD).o flash.o \
+obj-y	= hh405.o flash.o \
 	../common/misc.o \
 	../common/esd405ep_nand.o \
 	../common/auto_update.o
-
-SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
-OBJS	:= $(addprefix $(obj),$(COBJS))
-SOBJS	:= $(addprefix $(obj),$(SOBJS))
-
-$(LIB):	$(OBJS) $(SOBJS)
-	$(call cmd_link_o_target, $(OBJS))
-
-#########################################################################
-
-# defines $(obj).depend target
-include $(SRCTREE)/rules.mk
-
-sinclude $(obj).depend
-
-#########################################################################