diff --git a/arch/sparc/cpu/leon2/Makefile b/arch/sparc/cpu/leon2/Makefile
index f43d3d2..8c95ca5 100644
--- a/arch/sparc/cpu/leon2/Makefile
+++ b/arch/sparc/cpu/leon2/Makefile
@@ -5,28 +5,5 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-include $(TOPDIR)/config.mk
-
-LIB	= $(obj)lib$(CPU).o
-
-START	= start.o
-SOBJS	=
-COBJS	= cpu_init.o serial.o cpu.o interrupts.o prom.o
-
-SRCS	:= $(START:.o=.S) $(SOBJS:.o=.S) $(COBJS:.o=.c)
-OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))
-START	:= $(addprefix $(obj),$(START))
-
-all:	$(obj).depend $(START) $(LIB)
-
-$(LIB):	$(OBJS)
-	$(call cmd_link_o_target, $(OBJS))
-
-#########################################################################
-
-# defines $(obj).depend target
-include $(SRCTREE)/rules.mk
-
-sinclude $(obj).depend
-
-#########################################################################
+extra-y	= start.o
+obj-y	= cpu_init.o serial.o cpu.o interrupts.o prom.o
diff --git a/arch/sparc/cpu/leon3/Makefile b/arch/sparc/cpu/leon3/Makefile
index 95bbfc9..4f13ec3 100644
--- a/arch/sparc/cpu/leon3/Makefile
+++ b/arch/sparc/cpu/leon3/Makefile
@@ -5,28 +5,5 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-include $(TOPDIR)/config.mk
-
-LIB	= $(obj)lib$(CPU).o
-
-START	= start.o
-SOBJS	=
-COBJS	= cpu_init.o serial.o cpu.o ambapp.o interrupts.o prom.o usb_uhci.o
-
-SRCS	:= $(START:.o=.S) $(SOBJS:.o=.S) $(COBJS:.o=.c)
-OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))
-START	:= $(addprefix $(obj),$(START))
-
-all:	$(obj).depend $(START) $(LIB)
-
-$(LIB):	$(OBJS)
-	$(call cmd_link_o_target, $(OBJS))
-
-#########################################################################
-
-# defines $(obj).depend target
-include $(SRCTREE)/rules.mk
-
-sinclude $(obj).depend
-
-#########################################################################
+extra-y	= start.o
+obj-y	= cpu_init.o serial.o cpu.o ambapp.o interrupts.o prom.o usb_uhci.o
diff --git a/arch/sparc/lib/Makefile b/arch/sparc/lib/Makefile
index 9914e35..e69b9ba 100644
--- a/arch/sparc/lib/Makefile
+++ b/arch/sparc/lib/Makefile
@@ -5,28 +5,5 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-include $(TOPDIR)/config.mk
-
-LIB	= $(obj)lib$(ARCH).o
-
-SOBJS	=
-
-COBJS	= board.o cache.o interrupts.o time.o
-COBJS-$(CONFIG_CMD_BOOTM) += bootm.o
-
-COBJS := $(COBJS) $(COBJS-y)
-
-SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
-OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))
-
-$(LIB):	$(obj).depend $(OBJS)
-	$(call cmd_link_o_target, $(OBJS))
-
-#########################################################################
-
-# defines $(obj).depend target
-include $(SRCTREE)/rules.mk
-
-sinclude $(obj).depend
-
-#########################################################################
+obj-y	= board.o cache.o interrupts.o time.o
+obj-$(CONFIG_CMD_BOOTM) += bootm.o
diff --git a/board/gaisler/gr_cpci_ax2000/Makefile b/board/gaisler/gr_cpci_ax2000/Makefile
index baa067d..1cef4d5 100644
--- a/board/gaisler/gr_cpci_ax2000/Makefile
+++ b/board/gaisler/gr_cpci_ax2000/Makefile
@@ -6,25 +6,4 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-include $(TOPDIR)/config.mk
-
-LIB	= $(obj)lib$(BOARD).o
-
-COBJS	:= $(BOARD).o
-
-#flash.o
-SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
-OBJS	:= $(addprefix $(obj),$(COBJS))
-SOBJS	:= $(addprefix $(obj),$(SOBJS))
-
-$(LIB):	$(obj).depend $(OBJS)
-	$(call cmd_link_o_target, $(OBJS))
-
-#########################################################################
-
-# defines $(obj).depend target
-include $(SRCTREE)/rules.mk
-
-sinclude $(obj).depend
-
-#########################################################################
+obj-y	:= gr_cpci_ax2000.o
diff --git a/board/gaisler/gr_ep2s60/Makefile b/board/gaisler/gr_ep2s60/Makefile
index baa067d..a8b3e6a 100644
--- a/board/gaisler/gr_ep2s60/Makefile
+++ b/board/gaisler/gr_ep2s60/Makefile
@@ -6,25 +6,4 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-include $(TOPDIR)/config.mk
-
-LIB	= $(obj)lib$(BOARD).o
-
-COBJS	:= $(BOARD).o
-
-#flash.o
-SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
-OBJS	:= $(addprefix $(obj),$(COBJS))
-SOBJS	:= $(addprefix $(obj),$(SOBJS))
-
-$(LIB):	$(obj).depend $(OBJS)
-	$(call cmd_link_o_target, $(OBJS))
-
-#########################################################################
-
-# defines $(obj).depend target
-include $(SRCTREE)/rules.mk
-
-sinclude $(obj).depend
-
-#########################################################################
+obj-y	:= gr_ep2s60.o
diff --git a/board/gaisler/gr_xc3s_1500/Makefile b/board/gaisler/gr_xc3s_1500/Makefile
index baa067d..2ca473d 100644
--- a/board/gaisler/gr_xc3s_1500/Makefile
+++ b/board/gaisler/gr_xc3s_1500/Makefile
@@ -6,25 +6,4 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-include $(TOPDIR)/config.mk
-
-LIB	= $(obj)lib$(BOARD).o
-
-COBJS	:= $(BOARD).o
-
-#flash.o
-SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
-OBJS	:= $(addprefix $(obj),$(COBJS))
-SOBJS	:= $(addprefix $(obj),$(SOBJS))
-
-$(LIB):	$(obj).depend $(OBJS)
-	$(call cmd_link_o_target, $(OBJS))
-
-#########################################################################
-
-# defines $(obj).depend target
-include $(SRCTREE)/rules.mk
-
-sinclude $(obj).depend
-
-#########################################################################
+obj-y	:= gr_xc3s_1500.o
diff --git a/board/gaisler/grsim/Makefile b/board/gaisler/grsim/Makefile
index 2c0119e..4c93bda 100644
--- a/board/gaisler/grsim/Makefile
+++ b/board/gaisler/grsim/Makefile
@@ -5,24 +5,4 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-include $(TOPDIR)/config.mk
-
-LIB	= $(obj)lib$(BOARD).o
-
-COBJS	:= $(BOARD).o
-
-SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
-OBJS	:= $(addprefix $(obj),$(COBJS))
-SOBJS	:= $(addprefix $(obj),$(SOBJS))
-
-$(LIB):	$(obj).depend $(OBJS)
-	$(call cmd_link_o_target, $(OBJS))
-
-#########################################################################
-
-# defines $(obj).depend target
-include $(SRCTREE)/rules.mk
-
-sinclude $(obj).depend
-
-#########################################################################
+obj-y	:= grsim.o
diff --git a/board/gaisler/grsim_leon2/Makefile b/board/gaisler/grsim_leon2/Makefile
index 2c0119e..5468305 100644
--- a/board/gaisler/grsim_leon2/Makefile
+++ b/board/gaisler/grsim_leon2/Makefile
@@ -5,24 +5,4 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-include $(TOPDIR)/config.mk
-
-LIB	= $(obj)lib$(BOARD).o
-
-COBJS	:= $(BOARD).o
-
-SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
-OBJS	:= $(addprefix $(obj),$(COBJS))
-SOBJS	:= $(addprefix $(obj),$(SOBJS))
-
-$(LIB):	$(obj).depend $(OBJS)
-	$(call cmd_link_o_target, $(OBJS))
-
-#########################################################################
-
-# defines $(obj).depend target
-include $(SRCTREE)/rules.mk
-
-sinclude $(obj).depend
-
-#########################################################################
+obj-y	:= grsim_leon2.o
