diff --git a/board/MigoR/Makefile b/board/MigoR/Makefile
index f1e2856..1f7d003 100644
--- a/board/MigoR/Makefile
+++ b/board/MigoR/Makefile
@@ -24,11 +24,15 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= lib$(BOARD).a
+LIB	= $(obj)lib$(BOARD).a
 
 OBJS	:= migo_r.o
 SOBJS	:= lowlevel_init.o
 
+SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(COBJS))
+SOBJS	:= $(addprefix $(obj),$(SOBJS))
+
 $(LIB):	$(OBJS) $(SOBJS)
 	$(AR) $(ARFLAGS) $@ $(OBJS) $(SOBJS)
 
@@ -40,9 +44,9 @@
 
 #########################################################################
 
-.depend:	Makefile $(SOBJS:.o=.S) $(OBJS:.o=.c)
-		$(CC) -M $(CPPFLAGS) $(SOBJS:.o=.S) $(OBJS:.o=.c) > $@
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
 
--include .depend
+sinclude $(obj).depend
 
 #########################################################################
diff --git a/board/freescale/m5275evb/Makefile b/board/freescale/m5275evb/Makefile
index 5d09afe..ef0b19e 100644
--- a/board/freescale/m5275evb/Makefile
+++ b/board/freescale/m5275evb/Makefile
@@ -23,18 +23,22 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= lib$(BOARD).a
+LIB	= $(obj)lib$(BOARD).a
 
 OBJS	= $(BOARD).o mii.o
 
+SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(COBJS))
+SOBJS	:= $(addprefix $(obj),$(SOBJS))
+
 $(LIB):	.depend $(OBJS)
 	$(AR) $(ARFLAGS) $@ $(OBJS)
 
 #########################################################################
 
-.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/mpr2/Makefile b/board/mpr2/Makefile
index a10ec77..69e6525 100644
--- a/board/mpr2/Makefile
+++ b/board/mpr2/Makefile
@@ -30,11 +30,15 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= lib$(BOARD).a
+LIB	= $(obj)lib$(BOARD).a
 
 OBJS	:= mpr2.o
 SOBJS	:= lowlevel_init.o
 
+SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(COBJS))
+SOBJS	:= $(addprefix $(obj),$(SOBJS))
+
 $(LIB):	$(OBJS) $(SOBJS)
 	$(AR) $(ARFLAGS) $@ $(OBJS) $(SOBJS)
 
@@ -46,9 +50,9 @@
 
 #########################################################################
 
-.depend:	Makefile $(SOBJS:.o=.S) $(OBJS:.o=.c)
-		$(CC) -M $(CPPFLAGS) $(SOBJS:.o=.S) $(OBJS:.o=.c) > $@
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
 
--include .depend
+sinclude $(obj).depend
 
 #########################################################################
diff --git a/board/ms7720se/Makefile b/board/ms7720se/Makefile
index 236959c..0288bed 100644
--- a/board/ms7720se/Makefile
+++ b/board/ms7720se/Makefile
@@ -27,11 +27,15 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= lib$(BOARD).a
+LIB	= $(obj)lib$(BOARD).a
 
 OBJS	:= ms7720se.o
 SOBJS	:= lowlevel_init.o
 
+SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(COBJS))
+SOBJS	:= $(addprefix $(obj),$(SOBJS))
+
 $(LIB):	$(OBJS) $(SOBJS)
 	$(AR) $(ARFLAGS) $@ $(OBJS) $(SOBJS)
 
@@ -43,9 +47,9 @@
 
 #########################################################################
 
-.depend:	Makefile $(SOBJS:.o=.S) $(OBJS:.o=.c)
-		$(CC) -M $(CPPFLAGS) $(SOBJS:.o=.S) $(OBJS:.o=.c) > $@
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
 
--include .depend
+sinclude $(obj).depend
 
 #########################################################################
diff --git a/board/ms7722se/Makefile b/board/ms7722se/Makefile
index b384687..41e0faf 100644
--- a/board/ms7722se/Makefile
+++ b/board/ms7722se/Makefile
@@ -24,11 +24,15 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= lib$(BOARD).a
+LIB	= $(obj)lib$(BOARD).a
 
 OBJS	:= ms7722se.o
 SOBJS	:= lowlevel_init.o
 
+SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(COBJS))
+SOBJS	:= $(addprefix $(obj),$(SOBJS))
+
 $(LIB):	$(OBJS) $(SOBJS)
 	$(AR) $(ARFLAGS) $@ $(OBJS) $(SOBJS)
 
@@ -40,9 +44,9 @@
 
 #########################################################################
 
-.depend:	Makefile $(SOBJS:.o=.S) $(OBJS:.o=.c)
-		$(CC) -M $(CPPFLAGS) $(SOBJS:.o=.S) $(OBJS:.o=.c) > $@
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
 
--include .depend
+sinclude $(obj).depend
 
 #########################################################################
diff --git a/board/ms7750se/Makefile b/board/ms7750se/Makefile
index f02ad0a..b4b82bb 100644
--- a/board/ms7750se/Makefile
+++ b/board/ms7750se/Makefile
@@ -19,11 +19,15 @@
 #
 include $(TOPDIR)/config.mk
 
-LIB	= lib$(BOARD).a
+LIB	= $(obj)lib$(BOARD).a
 
 OBJS	:= ms7750se.o
 SOBJS	:= lowlevel_init.o
 
+SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(COBJS))
+SOBJS	:= $(addprefix $(obj),$(SOBJS))
+
 $(LIB):	$(OBJS) $(SOBJS)
 	$(AR) $(ARFLAGS) $@ $(OBJS) $(SOBJS)
 
@@ -33,11 +37,11 @@
 distclean:	clean
 	rm -f $(LIB) core *.bak .depend
 
-#################################################################
+#########################################################################
 
-.depend:	Makefile $(SOBJS:.o=.S) $(OBJS:.o=.c)
-	$(CC) -M $(CPPFLAGS) $(SOBJS:.o=.S) $(OBJS:.o=.c) > $@
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
 
--include .depend
+sinclude $(obj).depend
 
-#################################################################
+#########################################################################
diff --git a/board/r2dplus/Makefile b/board/r2dplus/Makefile
index 2909d46..5b50987 100644
--- a/board/r2dplus/Makefile
+++ b/board/r2dplus/Makefile
@@ -19,11 +19,15 @@
 #
 include $(TOPDIR)/config.mk
 
-LIB	= lib$(BOARD).a
+LIB	= $(obj)lib$(BOARD).a
 
 OBJS	:= r2dplus.o
 SOBJS	:= lowlevel_init.o
 
+SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(COBJS))
+SOBJS	:= $(addprefix $(obj),$(SOBJS))
+
 $(LIB):	$(OBJS) $(SOBJS)
 	$(AR) $(ARFLAGS) $@ $(OBJS) $(SOBJS)
 
@@ -33,11 +37,11 @@
 distclean:	clean
 	rm -f $(LIB) core *.bak .depend
 
-#################################################################
+#########################################################################
 
-.depend:	Makefile $(SOBJS:.o=.S) $(OBJS:.o=.c)
-	$(CC) -M $(CPPFLAGS) $(SOBJS:.o=.S) $(OBJS:.o=.c) > $@
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
 
--include .depend
+sinclude $(obj).depend
 
-#################################################################
+#########################################################################
diff --git a/board/r7780mp/Makefile b/board/r7780mp/Makefile
index f0f1c97..34ce9a8 100644
--- a/board/r7780mp/Makefile
+++ b/board/r7780mp/Makefile
@@ -20,11 +20,15 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= lib$(BOARD).a
+LIB	= $(obj)lib$(BOARD).a
 
 OBJS	:= r7780mp.o
 SOBJS	:= lowlevel_init.o
 
+SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(COBJS))
+SOBJS	:= $(addprefix $(obj),$(SOBJS))
+
 $(LIB):	$(OBJS) $(SOBJS)
 	$(AR) $(ARFLAGS) $@ $(OBJS) $(SOBJS)
 
@@ -36,9 +40,9 @@
 
 #########################################################################
 
-.depend:	Makefile $(SOBJS:.o=.S) $(OBJS:.o=.c)
-		$(CC) -M $(CPPFLAGS) $(SOBJS:.o=.S) $(OBJS:.o=.c) > $@
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
 
--include .depend
+sinclude $(obj).depend
 
 #########################################################################
diff --git a/board/sh7763rdp/Makefile b/board/sh7763rdp/Makefile
index eef25d9..fc13955 100644
--- a/board/sh7763rdp/Makefile
+++ b/board/sh7763rdp/Makefile
@@ -23,11 +23,15 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= lib$(BOARD).a
+LIB	= $(obj)lib$(BOARD).a
 
 OBJS	:= sh7763rdp.o
 SOBJS	:= lowlevel_init.o
 
+SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(COBJS))
+SOBJS	:= $(addprefix $(obj),$(SOBJS))
+
 $(LIB):	$(OBJS) $(SOBJS)
 	$(AR) $(ARFLAGS) $@ $(OBJS) $(SOBJS)
 
@@ -39,9 +43,9 @@
 
 #########################################################################
 
-.depend:	Makefile $(SOBJS:.o=.S) $(OBJS:.o=.c)
-		$(CC) -M $(CPPFLAGS) $(SOBJS:.o=.S) $(OBJS:.o=.c) > $@
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
 
--include .depend
+sinclude $(obj).depend
 
 #########################################################################
diff --git a/cpu/sh3/Makefile b/cpu/sh3/Makefile
index 1fdeb3c..441c765 100644
--- a/cpu/sh3/Makefile
+++ b/cpu/sh3/Makefile
@@ -31,19 +31,27 @@
 
 LIB	= $(obj)lib$(CPU).a
 
-START	= start.o
+SOBJS	= start.o
 OBJS	= cpu.o interrupts.o watchdog.o time.o cache.o
 
-all:	.depend $(START) $(LIB)
+SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(COBJS))
+SOBJS	:= $(addprefix $(obj),$(SOBJS))
 
-$(LIB):	$(OBJS)
-	$(AR) $(ARFLAGS) $@ $(OBJS)
+$(LIB):	$(OBJS) $(SOBJS)
+	$(AR) $(ARFLAGS) $@ $(OBJS) $(SOBJS)
+
+clean:
+	rm -f $(SOBJS) $(OBJS)
+
+distclean:	clean
+	rm -f $(LIB) core *.bak .depend
 
 #########################################################################
 
-.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/cpu/sh4/Makefile b/cpu/sh4/Makefile
index aaaaf1f..6192913 100644
--- a/cpu/sh4/Makefile
+++ b/cpu/sh4/Makefile
@@ -28,19 +28,27 @@
 
 LIB	= $(obj)lib$(CPU).a
 
-START	= start.o
+SOBJS	= start.o
 OBJS	= cpu.o interrupts.o watchdog.o time.o cache.o
 
-all:	.depend $(START) $(LIB)
+SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(COBJS))
+SOBJS	:= $(addprefix $(obj),$(SOBJS))
 
-$(LIB):	$(OBJS)
-	$(AR) $(ARFLAGS) $@ $(OBJS)
+$(LIB):	$(OBJS) $(SOBJS)
+	$(AR) $(ARFLAGS) $@ $(OBJS) $(SOBJS)
+
+clean:
+	rm -f $(SOBJS) $(OBJS)
+
+distclean:	clean
+	rm -f $(LIB) core *.bak .depend
 
 #########################################################################
 
-.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
 
 #########################################################################