diff --git a/board/bf533-ezkit/Makefile b/board/bf533-ezkit/Makefile
index 8f51eb2..4fe7d78 100644
--- a/board/bf533-ezkit/Makefile
+++ b/board/bf533-ezkit/Makefile
@@ -27,22 +27,32 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= lib$(BOARD).a
+LIB	= $(obj)lib$(BOARD).a
 
-OBJS	= $(BOARD).o flash.o
+COBJS	:= $(BOARD).o flash.o
 
-$(LIB):	.depend $(OBJS) u-boot.lds
-	$(AR) cr $@ $(OBJS)
+SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(COBJS))
+SOBJS	:= $(addprefix $(obj),$(SOBJS))
+
+$(LIB):	$(obj).depend $(OBJS) $(SOBJS) u-boot.lds
+	$(AR) $(ARFLAGS) $@ $(OBJS) $(SOBJS)
 
 u-boot.lds: u-boot.lds.S
 	$(CPP) $(CPPFLAGS) -P -Ubfin $^ > $@.tmp
 	mv -f $@.tmp $@
 
+clean:
+	rm -f $(SOBJS) $(OBJS)
+
+distclean:	clean
+	rm -f $(LIB) core *.bak .depend
+
 #########################################################################
 
-.depend:	Makefile $(SOBJS:.o=.S) $(OBJS:.o=.c)
-		$(CC) -M $(CFLAGS) $(SOBJS:.o=.S) $(OBJS:.o=.c) > $@
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
 
-sinclude .depend
+sinclude $(obj).depend
 
 #########################################################################
diff --git a/board/bf533-stamp/Makefile b/board/bf533-stamp/Makefile
index 217e5f0..8223d59 100644
--- a/board/bf533-stamp/Makefile
+++ b/board/bf533-stamp/Makefile
@@ -27,22 +27,32 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= lib$(BOARD).a
+LIB	= $(obj)lib$(BOARD).a
 
-OBJS	= $(BOARD).o spi.o
+COBJS	:= $(BOARD).o spi.o
 
-$(LIB):	.depend $(OBJS) u-boot.lds
-	$(AR) cr $@ $(OBJS)
+SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(COBJS))
+SOBJS	:= $(addprefix $(obj),$(SOBJS))
+
+$(LIB):	$(obj).depend $(OBJS) $(SOBJS) u-boot.lds
+	$(AR) $(ARFLAGS) $@ $(OBJS) $(SOBJS)
 
 u-boot.lds: u-boot.lds.S
 	$(CPP) $(CPPFLAGS) -P -Ubfin $^ > $@.tmp
 	mv -f $@.tmp $@
 
+clean:
+	rm -f $(SOBJS) $(OBJS)
+
+distclean:	clean
+	rm -f $(LIB) core *.bak .depend
+
 #########################################################################
 
-.depend:	Makefile $(SOBJS:.o=.S) $(OBJS:.o=.c)
-		$(CC) -M $(CFLAGS) $(SOBJS:.o=.S) $(OBJS:.o=.c) > $@
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
 
-sinclude .depend
+sinclude $(obj).depend
 
 #########################################################################
diff --git a/cpu/bf533/Makefile b/cpu/bf533/Makefile
index 6fd5e33..ee7842a 100644
--- a/cpu/bf533/Makefile
+++ b/cpu/bf533/Makefile
@@ -26,23 +26,27 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= lib$(CPU).a
+LIB	= $(obj)lib$(CPU).a
 
 START	= start.o start1.o interrupt.o cache.o flush.o init_sdram.o
-OBJS	= cpu.o traps.o ints.o serial.o interrupts.o video.o
+COBJS	= cpu.o traps.o ints.o serial.o interrupts.o video.o
 
 EXTRA = init_sdram_bootrom_initblock.o
 
-all:	.depend $(START) $(LIB) .depend $(EXTRA)
+SRCS	:= $(START:.o=.S) $(SOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(COBJS) $(SOBJS))
+START	:= $(addprefix $(obj),$(START))
+
+all:	$(obj).depend $(START) $(LIB) $(obj).depend $(EXTRA)
 
 $(LIB):	$(OBJS)
-	$(AR) cr $@ $(OBJS)
+	$(AR) $(ARFLAGS) $@ $(OBJS)
 
 #########################################################################
 
-.depend:	Makefile $(START:.o=.S) $(OBJS:.o=.c)
-		$(CC) -M $(CFLAGS) $(START:.o=.S) $(OBJS:.o=.c) > $@
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
 
-sinclude .depend
+sinclude $(obj).depend
 
 #########################################################################
diff --git a/lib_blackfin/Makefile b/lib_blackfin/Makefile
index 4171473..ac78662 100644
--- a/lib_blackfin/Makefile
+++ b/lib_blackfin/Makefile
@@ -27,21 +27,23 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= lib$(ARCH).a
+LIB	= $(obj)lib$(ARCH).a
 
-AOBJS	= memcpy.o memcmp.o memset.o memmove.o
+SOBJS	= memcpy.o memcmp.o memset.o memmove.o
 
 COBJS	= post.o tests.o board.o bf533_linux.o bf533_string.o cache.o muldi3.o
-OBJS	= $(AOBJS) $(COBJS)
 
-$(LIB):	.depend $(OBJS)
-	$(AR) cr $@ $(OBJS)
+SRCS 	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))
+
+$(LIB):	$(obj).depend $(OBJS)
+	$(AR) $(ARFLAGS) $@ $(OBJS)
 
 #########################################################################
 
-.depend:	Makefile $(AOBJS:.o=.S) $(COBJS:.o=.c)
-		$(CC) -M $(CFLAGS) $(AOBJS:.o=.S) $(COBJS:.o=.c) > $@
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
 
-sinclude .depend
+sinclude $(obj).depend
 
 #########################################################################