kbuild: change out-of-tree build

This commit changes the working directory
where the build process occurs.

Before this commit, build process occurred under the source
tree for both in-tree and out-of-tree build.

That's why we needed to add $(obj) prefix to all generated
files in makefiles like follows:
  $(obj)u-boot.bin:  $(obj)u-boot

Here, $(obj) is empty for in-tree build, whereas it points
to the output directory for out-of-tree build.

And our old build system changes the current working directory
with "make -C <sub-dir>" syntax when descending into the
sub-directories.

On the other hand, Kbuild uses a different idea
to handle out-of-tree build and directory descending.

The build process of Kbuild always occurs under the output tree.
When "O=dir/to/store/output/files" is given, the build system
changes the current working directory to that directory and
restarts the make.

Kbuild uses "make -f $(srctree)/scripts/Makefile.build obj=<sub-dir>"
syntax for descending into sub-directories.
(We can write it like "make $(obj)=<sub-dir>" with a shorthand.)
This means the current working directory is always the top
of the output directory.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Tested-by: Gerhard Sittig <gsi@denx.de>

12 files changed, 141 insertions, 279 deletions

diff --git a/nand_spl/board/amcc/acadia/Makefile b/nand_spl/board/amcc/acadia/Makefile
index 3b00d49..041213f 100644
--- a/nand_spl/board/amcc/acadia/Makefile
+++ b/nand_spl/board/amcc/acadia/Makefile
@@ -18,8 +18,8 @@ CFLAGS	+= -DCONFIG_NAND_SPL
 SOBJS	= start.o resetvec.o cache.o
 COBJS	= gpio.o nand_boot.o nand_ecc.o memory.o ndfc.o pll.o
 
-SRCS	:= $(addprefix $(obj),$(SOBJS:.o=.S) $(COBJS:.o=.c))
-OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))
+SRCS	:= $(addprefix $(obj)/,$(SOBJS:.o=.S) $(COBJS:.o=.c))
+OBJS	:= $(addprefix $(obj)/,$(SOBJS) $(COBJS))
 __OBJS	:= $(SOBJS) $(COBJS)
 LNDIR	:= $(nandobj)board/$(BOARDDIR)
 
@@ -47,49 +47,41 @@ $(nandobj)u-boot.lds: $(LDSCRIPT)
 # create symbolic links for common files
 
 # from cpu directory
-$(obj)cache.S:
+$(obj)/cache.S:
 	@rm -f $@
 	ln -s $(SRCTREE)/arch/powerpc/cpu/ppc4xx/cache.S $@
 
-$(obj)gpio.c:
+$(obj)/gpio.c:
 	@rm -f $@
 	ln -s $(SRCTREE)/arch/powerpc/cpu/ppc4xx/gpio.c $@
 
-$(obj)ndfc.c:
+$(obj)/ndfc.c:
 	@rm -f $@
 	ln -s $(SRCTREE)/drivers/mtd/nand/ndfc.c $@
 
-$(obj)resetvec.S:
+$(obj)/resetvec.S:
 	@rm -f $@
 	ln -s $(SRCTREE)/arch/powerpc/cpu/ppc4xx/resetvec.S $@
 
-$(obj)start.S:
+$(obj)/start.S:
 	@rm -f $@
 	ln -s $(SRCTREE)/arch/powerpc/cpu/ppc4xx/start.S $@
 
 # from board directory
-$(obj)memory.c:
+$(obj)/memory.c:
 	@rm -f $@
 	ln -s $(SRCTREE)/board/amcc/acadia/memory.c $@
 
-$(obj)pll.c:
+$(obj)/pll.c:
 	@rm -f $@
 	ln -s $(SRCTREE)/board/amcc/acadia/pll.c $@
 
 # from nand_spl directory
-$(obj)nand_boot.c:
+$(obj)/nand_boot.c:
 	@rm -f $@
 	ln -s $(SRCTREE)/nand_spl/nand_boot.c $@
 
 # from drivers/mtd/nand directory
-$(obj)nand_ecc.c:
+$(obj)/nand_ecc.c:
 	@rm -f $@
 	ln -s $(SRCTREE)/drivers/mtd/nand/nand_ecc.c $@
-
-#########################################################################
-
-$(obj)%.o:	$(obj)%.S
-	$(CC) $(AFLAGS) -c -o $@ $<
-
-$(obj)%.o:	$(obj)%.c
-	$(CC) $(CFLAGS) -c -o $@ $<
diff --git a/nand_spl/board/amcc/bamboo/Makefile b/nand_spl/board/amcc/bamboo/Makefile
index 4063274..92b604e 100644
--- a/nand_spl/board/amcc/bamboo/Makefile
+++ b/nand_spl/board/amcc/bamboo/Makefile
@@ -18,8 +18,8 @@ CFLAGS	+= -DCONFIG_NAND_SPL
 SOBJS	= start.o init.o resetvec.o
 COBJS	= nand_boot.o nand_ecc.o ndfc.o sdram.o
 
-SRCS	:= $(addprefix $(obj),$(SOBJS:.o=.S) $(COBJS:.o=.c))
-OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))
+SRCS	:= $(addprefix $(obj)/,$(SOBJS:.o=.S) $(COBJS:.o=.c))
+OBJS	:= $(addprefix $(obj)/,$(SOBJS) $(COBJS))
 __OBJS	:= $(SOBJS) $(COBJS)
 LNDIR	:= $(nandobj)board/$(BOARDDIR)
 
@@ -41,43 +41,29 @@ $(nandobj)u-boot.lds: $(LDSCRIPT)
 # create symbolic links for common files
 
 # from cpu directory
-$(obj)ndfc.c:
+$(obj)/ndfc.c:
 	@rm -f $@
 	ln -s $(SRCTREE)/drivers/mtd/nand/ndfc.c $@
 
-$(obj)resetvec.S:
+$(obj)/resetvec.S:
 	@rm -f $@
 	ln -s $(SRCTREE)/arch/powerpc/cpu/ppc4xx/resetvec.S $@
 
-$(obj)start.S:
+$(obj)/start.S:
 	@rm -f $@
 	ln -s $(SRCTREE)/arch/powerpc/cpu/ppc4xx/start.S $@
 
 # from board directory
-$(obj)init.S:
+$(obj)/init.S:
 	@rm -f $@
 	ln -s $(SRCTREE)/board/amcc/bamboo/init.S $@
 
 # from nand_spl directory
-$(obj)nand_boot.c:
+$(obj)/nand_boot.c:
 	@rm -f $@
 	ln -s $(SRCTREE)/nand_spl/nand_boot.c $@
 
 # from drivers/mtd/nand directory
-$(obj)nand_ecc.c:
+$(obj)/nand_ecc.c:
 	@rm -f $@
 	ln -s $(SRCTREE)/drivers/mtd/nand/nand_ecc.c $@
-
-ifneq ($(OBJTREE), $(SRCTREE))
-$(obj)sdram.c:
-	@rm -f $@
-	ln -s $(SRCTREE)/nand_spl/board/$(BOARDDIR)/sdram.c $@
-endif
-
-#########################################################################
-
-$(obj)%.o:	$(obj)%.S
-	$(CC) $(AFLAGS) -c -o $@ $<
-
-$(obj)%.o:	$(obj)%.c
-	$(CC) $(CFLAGS) -c -o $@ $<
diff --git a/nand_spl/board/amcc/canyonlands/Makefile b/nand_spl/board/amcc/canyonlands/Makefile
index 13c8b36..9a730e9 100644
--- a/nand_spl/board/amcc/canyonlands/Makefile
+++ b/nand_spl/board/amcc/canyonlands/Makefile
@@ -23,8 +23,8 @@ COBJS	+= nand_boot.o
 COBJS	+= nand_ecc.o
 COBJS	+= ndfc.o
 
-SRCS	:= $(addprefix $(obj),$(SOBJS:.o=.S) $(COBJS:.o=.c))
-OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))
+SRCS	:= $(addprefix $(obj)/,$(SOBJS:.o=.S) $(COBJS:.o=.c))
+OBJS	:= $(addprefix $(obj)/,$(SOBJS) $(COBJS))
 __OBJS	:= $(SOBJS) $(COBJS)
 LNDIR	:= $(nandobj)board/$(BOARDDIR)
 
@@ -46,43 +46,29 @@ $(nandobj)u-boot.lds: $(LDSCRIPT)
 # create symbolic links for common files
 
 # from cpu directory
-$(obj)ndfc.c:
+$(obj)/ndfc.c:
 	@rm -f $@
 	ln -s $(SRCTREE)/drivers/mtd/nand/ndfc.c $@
 
-$(obj)resetvec.S:
+$(obj)/resetvec.S:
 	@rm -f $@
 	ln -s $(SRCTREE)/arch/powerpc/cpu/ppc4xx/resetvec.S $@
 
-$(obj)start.S:
+$(obj)/start.S:
 	@rm -f $@
 	ln -s $(SRCTREE)/arch/powerpc/cpu/ppc4xx/start.S $@
 
 # from board directory
-$(obj)init.S:
+$(obj)/init.S:
 	@rm -f $@
 	ln -s $(SRCTREE)/board/amcc/canyonlands/init.S $@
 
 # from nand_spl directory
-$(obj)nand_boot.c:
+$(obj)/nand_boot.c:
 	@rm -f $@
 	ln -s $(SRCTREE)/nand_spl/nand_boot.c $@
 
 # from drivers/mtd/nand directory
-$(obj)nand_ecc.c:
+$(obj)/nand_ecc.c:
 	@rm -f $@
 	ln -s $(SRCTREE)/drivers/mtd/nand/nand_ecc.c $@
-
-ifneq ($(OBJTREE), $(SRCTREE))
-$(obj)ddr2_fixed.c:
-	@rm -f $@
-	ln -s $(SRCTREE)/nand_spl/board/$(BOARDDIR)/ddr2_fixed.c $@
-endif
-
-#########################################################################
-
-$(obj)%.o:	$(obj)%.S
-	$(CC) $(AFLAGS) -c -o $@ $<
-
-$(obj)%.o:	$(obj)%.c
-	$(CC) $(CFLAGS) -c -o $@ $<
diff --git a/nand_spl/board/amcc/kilauea/Makefile b/nand_spl/board/amcc/kilauea/Makefile
index 9d07147..1c5498c 100644
--- a/nand_spl/board/amcc/kilauea/Makefile
+++ b/nand_spl/board/amcc/kilauea/Makefile
@@ -18,8 +18,8 @@ CFLAGS	+= -DCONFIG_NAND_SPL
 SOBJS	= start.o resetvec.o cache.o
 COBJS	= 44x_spd_ddr2.o nand_boot.o nand_ecc.o ndfc.o
 
-SRCS	:= $(addprefix $(obj),$(SOBJS:.o=.S) $(COBJS:.o=.c))
-OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))
+SRCS	:= $(addprefix $(obj)/,$(SOBJS:.o=.S) $(COBJS:.o=.c))
+OBJS	:= $(addprefix $(obj)/,$(SOBJS) $(COBJS))
 __OBJS	:= $(SOBJS) $(COBJS)
 LNDIR	:= $(nandobj)board/$(BOARDDIR)
 
@@ -41,44 +41,36 @@ $(nandobj)u-boot.lds: $(LDSCRIPT)
 # create symbolic links for common files
 
 # from cpu directory
-$(obj)44x_spd_ddr2.c: $(obj)ecc.h
+$(obj)/44x_spd_ddr2.c: $(obj)/ecc.h
 	@rm -f $@
 	ln -s $(SRCTREE)/arch/powerpc/cpu/ppc4xx/44x_spd_ddr2.c $@
 
-$(obj)cache.S:
+$(obj)/cache.S:
 	@rm -f $@
 	ln -s $(SRCTREE)/arch/powerpc/cpu/ppc4xx/cache.S $@
 
-$(obj)ecc.h:
+$(obj)/ecc.h:
 	@rm -f $@
 	ln -s $(SRCTREE)/arch/powerpc/cpu/ppc4xx/ecc.h $@
 
-$(obj)ndfc.c:
+$(obj)/ndfc.c:
 	@rm -f $@
 	ln -s $(SRCTREE)/drivers/mtd/nand/ndfc.c $@
 
-$(obj)resetvec.S:
+$(obj)/resetvec.S:
 	@rm -f $@
 	ln -s $(SRCTREE)/arch/powerpc/cpu/ppc4xx/resetvec.S $@
 
-$(obj)start.S:
+$(obj)/start.S:
 	@rm -f $@
 	ln -s $(SRCTREE)/arch/powerpc/cpu/ppc4xx/start.S $@
 
 # from nand_spl directory
-$(obj)nand_boot.c:
+$(obj)/nand_boot.c:
 	@rm -f $@
 	ln -s $(SRCTREE)/nand_spl/nand_boot.c $@
 
 # from drivers/nand directory
-$(obj)nand_ecc.c:
+$(obj)/nand_ecc.c:
 	@rm -f $@
 	ln -s $(SRCTREE)/drivers/mtd/nand/nand_ecc.c $@
-
-#########################################################################
-
-$(obj)%.o:	$(obj)%.S
-	$(CC) $(AFLAGS) -c -o $@ $<
-
-$(obj)%.o:	$(obj)%.c
-	$(CC) $(CFLAGS) -c -o $@ $<
diff --git a/nand_spl/board/amcc/sequoia/Makefile b/nand_spl/board/amcc/sequoia/Makefile
index 111bb0d..62131ab 100644
--- a/nand_spl/board/amcc/sequoia/Makefile
+++ b/nand_spl/board/amcc/sequoia/Makefile
@@ -18,8 +18,8 @@ CFLAGS	+= -DCONFIG_NAND_SPL
 SOBJS	= start.o init.o resetvec.o
 COBJS	= denali_data_eye.o nand_boot.o nand_ecc.o ndfc.o sdram.o
 
-SRCS	:= $(addprefix $(obj),$(SOBJS:.o=.S) $(COBJS:.o=.c))
-OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))
+SRCS	:= $(addprefix $(obj)/,$(SOBJS:.o=.S) $(COBJS:.o=.c))
+OBJS	:= $(addprefix $(obj)/,$(SOBJS) $(COBJS))
 __OBJS	:= $(SOBJS) $(COBJS)
 LNDIR	:= $(nandobj)board/$(BOARDDIR)
 
@@ -41,47 +41,39 @@ $(nandobj)u-boot.lds: $(LDSCRIPT)
 # create symbolic links for common files
 
 # from cpu directory
-$(obj)denali_data_eye.c:
+$(obj)/denali_data_eye.c:
 	@rm -f $@
 	ln -s $(SRCTREE)/arch/powerpc/cpu/ppc4xx/denali_data_eye.c $@
 
-$(obj)ndfc.c:
+$(obj)/ndfc.c:
 	@rm -f $@
 	ln -s $(SRCTREE)/drivers/mtd/nand/ndfc.c $@
 
-$(obj)resetvec.S:
+$(obj)/resetvec.S:
 	@rm -f $@
 	ln -s $(SRCTREE)/arch/powerpc/cpu/ppc4xx/resetvec.S $@
 
-$(obj)start.S:
+$(obj)/start.S:
 	@rm -f $@
 	ln -s $(SRCTREE)/arch/powerpc/cpu/ppc4xx/start.S $@
 
 # from board directory
-$(obj)init.S:
+$(obj)/init.S:
 	@rm -f $@
 	ln -s $(SRCTREE)/board/amcc/sequoia/init.S $@
 
-$(obj)sdram.c:
+$(obj)/sdram.c:
 	@rm -f $@
-	@rm -f $(obj)sdram.h
+	@rm -f $(obj)/sdram.h
 	ln -s $(SRCTREE)/board/amcc/sequoia/sdram.c $@
-	ln -s $(SRCTREE)/board/amcc/sequoia/sdram.h $(obj)sdram.h
+	ln -s $(SRCTREE)/board/amcc/sequoia/sdram.h $(obj)/sdram.h
 
 # from nand_spl directory
-$(obj)nand_boot.c:
+$(obj)/nand_boot.c:
 	@rm -f $@
 	ln -s $(SRCTREE)/nand_spl/nand_boot.c $@
 
 # from drivers/mtd/nand directory
-$(obj)nand_ecc.c:
+$(obj)/nand_ecc.c:
 	@rm -f $@
 	ln -s $(SRCTREE)/drivers/mtd/nand/nand_ecc.c $@
-
-#########################################################################
-
-$(obj)%.o:	$(obj)%.S
-	$(CC) $(AFLAGS) -c -o $@ $<
-
-$(obj)%.o:	$(obj)%.c
-	$(CC) $(CFLAGS) -c -o $@ $<
diff --git a/nand_spl/board/freescale/mpc8315erdb/Makefile b/nand_spl/board/freescale/mpc8315erdb/Makefile
index 7813823..a2054ee 100644
--- a/nand_spl/board/freescale/mpc8315erdb/Makefile
+++ b/nand_spl/board/freescale/mpc8315erdb/Makefile
@@ -20,8 +20,8 @@ SOBJS	= start.o ticks.o
 COBJS	= nand_boot_fsl_elbc.o $(BOARD).o sdram.o ns16550.o spl_minimal.o \
 	  time.o cache.o
 
-SRCS	:= $(addprefix $(obj),$(SOBJS:.o=.S) $(COBJS:.o=.c))
-OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))
+SRCS	:= $(addprefix $(obj)/,$(SOBJS:.o=.S) $(COBJS:.o=.c))
+OBJS	:= $(addprefix $(obj)/,$(SOBJS) $(COBJS))
 __OBJS	:= $(SOBJS) $(COBJS)
 LNDIR	:= $(nandobj)board/$(BOARDDIR)
 
@@ -42,37 +42,29 @@ $(nandobj)u-boot.lds: $(LDSCRIPT)
 
 # create symbolic links for common files
 
-$(obj)start.S:
+$(obj)/start.S:
 	ln -sf $(SRCTREE)/arch/powerpc/cpu/mpc83xx/start.S $@
 
-$(obj)nand_boot_fsl_elbc.c:
+$(obj)/nand_boot_fsl_elbc.c:
 	ln -sf $(SRCTREE)/nand_spl/nand_boot_fsl_elbc.c $@
 
-$(obj)sdram.c:
+$(obj)/sdram.c:
 	ln -sf $(SRCTREE)/board/$(BOARDDIR)/sdram.c $@
 
-$(obj)$(BOARD).c:
+$(obj)/$(BOARD).c:
 	ln -sf $(SRCTREE)/board/$(BOARDDIR)/$(BOARD).c $@
 
-$(obj)ns16550.c:
+$(obj)/ns16550.c:
 	ln -sf $(SRCTREE)/drivers/serial/ns16550.c $@
 
-$(obj)spl_minimal.c:
+$(obj)/spl_minimal.c:
 	ln -sf $(SRCTREE)/arch/powerpc/cpu/mpc83xx/spl_minimal.c $@
 
-$(obj)cache.c:
+$(obj)/cache.c:
 	ln -sf $(SRCTREE)/arch/powerpc/lib/cache.c $@
 
-$(obj)time.c:
+$(obj)/time.c:
 	ln -sf $(SRCTREE)/arch/powerpc/lib/time.c $@
 
-$(obj)ticks.S:
+$(obj)/ticks.S:
 	ln -sf $(SRCTREE)/arch/powerpc/lib/ticks.S $@
-
-#########################################################################
-
-$(obj)%.o:	$(obj)%.S
-	$(CC) $(AFLAGS) -c -o $@ $<
-
-$(obj)%.o:	$(obj)%.c
-	$(CC) $(CFLAGS) -c -o $@ $<
diff --git a/nand_spl/board/freescale/mpc8536ds/Makefile b/nand_spl/board/freescale/mpc8536ds/Makefile
index 5d9953b..f711cf3 100644
--- a/nand_spl/board/freescale/mpc8536ds/Makefile
+++ b/nand_spl/board/freescale/mpc8536ds/Makefile
@@ -22,8 +22,8 @@ SOBJS	= start.o resetvec.o
 COBJS	= cache.o cpu_init_early.o spl_minimal.o fsl_law.o law.o \
 	  nand_boot.o nand_boot_fsl_elbc.o ns16550.o tlb.o tlb_table.o
 
-SRCS	:= $(addprefix $(obj),$(SOBJS:.o=.S) $(COBJS:.o=.c))
-OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))
+SRCS	:= $(addprefix $(obj)/,$(SOBJS:.o=.S) $(COBJS:.o=.c))
+OBJS	:= $(addprefix $(obj)/,$(SOBJS) $(COBJS))
 __OBJS	:= $(SOBJS) $(COBJS)
 LNDIR	:= $(nandobj)board/$(BOARDDIR)
 
@@ -45,64 +45,50 @@ $(nandobj)u-boot-nand_spl.lds: $(LDSCRIPT)
 
 # create symbolic links for common files
 
-$(obj)cache.c:
+$(obj)/cache.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/arch/powerpc/lib/cache.c $@
 
-$(obj)cpu_init_early.c:
+$(obj)/cpu_init_early.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/arch/powerpc/cpu/mpc85xx/cpu_init_early.c $@
 
-$(obj)spl_minimal.c:
+$(obj)/spl_minimal.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/arch/powerpc/cpu/mpc85xx/spl_minimal.c $@
 
-$(obj)fsl_law.c:
+$(obj)/fsl_law.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/arch/powerpc/cpu/mpc8xxx/law.c $@
 
-$(obj)law.c:
+$(obj)/law.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/board/$(BOARDDIR)/law.c $@
 
-$(obj)nand_boot_fsl_elbc.c:
+$(obj)/nand_boot_fsl_elbc.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/nand_spl/nand_boot_fsl_elbc.c $@
 
-$(obj)ns16550.c:
+$(obj)/ns16550.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/drivers/serial/ns16550.c $@
 
-$(obj)resetvec.S:
+$(obj)/resetvec.S:
 	@rm -f $@
 	ln -s $(SRCTREE)/$(CPUDIR)/resetvec.S $@
 
-$(obj)fixed_ivor.S:
+$(obj)/fixed_ivor.S:
 	@rm -f $@
 	ln -sf $(SRCTREE)/arch/powerpc/cpu/mpc85xx/fixed_ivor.S $@
 
-$(obj)start.S: $(obj)fixed_ivor.S
+$(obj)/start.S: $(obj)/fixed_ivor.S
 	@rm -f $@
 	ln -sf $(SRCTREE)/arch/powerpc/cpu/mpc85xx/start.S $@
 
-$(obj)tlb.c:
+$(obj)/tlb.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/arch/powerpc/cpu/mpc85xx/tlb.c $@
 
-$(obj)tlb_table.c:
+$(obj)/tlb_table.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/board/$(BOARDDIR)/tlb.c $@
-
-ifneq ($(OBJTREE), $(SRCTREE))
-$(obj)nand_boot.c:
-	@rm -f $@
-	ln -s $(SRCTREE)/nand_spl/board/$(BOARDDIR)/nand_boot.c $@
-endif
-
-#########################################################################
-
-$(obj)%.o:	$(obj)%.S
-	$(CC) $(AFLAGS) -c -o $@ $<
-
-$(obj)%.o:	$(obj)%.c
-	$(CC) $(CFLAGS) -c -o $@ $<
diff --git a/nand_spl/board/freescale/mpc8569mds/Makefile b/nand_spl/board/freescale/mpc8569mds/Makefile
index 5d9953b..f711cf3 100644
--- a/nand_spl/board/freescale/mpc8569mds/Makefile
+++ b/nand_spl/board/freescale/mpc8569mds/Makefile
@@ -22,8 +22,8 @@ SOBJS	= start.o resetvec.o
 COBJS	= cache.o cpu_init_early.o spl_minimal.o fsl_law.o law.o \
 	  nand_boot.o nand_boot_fsl_elbc.o ns16550.o tlb.o tlb_table.o
 
-SRCS	:= $(addprefix $(obj),$(SOBJS:.o=.S) $(COBJS:.o=.c))
-OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))
+SRCS	:= $(addprefix $(obj)/,$(SOBJS:.o=.S) $(COBJS:.o=.c))
+OBJS	:= $(addprefix $(obj)/,$(SOBJS) $(COBJS))
 __OBJS	:= $(SOBJS) $(COBJS)
 LNDIR	:= $(nandobj)board/$(BOARDDIR)
 
@@ -45,64 +45,50 @@ $(nandobj)u-boot-nand_spl.lds: $(LDSCRIPT)
 
 # create symbolic links for common files
 
-$(obj)cache.c:
+$(obj)/cache.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/arch/powerpc/lib/cache.c $@
 
-$(obj)cpu_init_early.c:
+$(obj)/cpu_init_early.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/arch/powerpc/cpu/mpc85xx/cpu_init_early.c $@
 
-$(obj)spl_minimal.c:
+$(obj)/spl_minimal.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/arch/powerpc/cpu/mpc85xx/spl_minimal.c $@
 
-$(obj)fsl_law.c:
+$(obj)/fsl_law.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/arch/powerpc/cpu/mpc8xxx/law.c $@
 
-$(obj)law.c:
+$(obj)/law.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/board/$(BOARDDIR)/law.c $@
 
-$(obj)nand_boot_fsl_elbc.c:
+$(obj)/nand_boot_fsl_elbc.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/nand_spl/nand_boot_fsl_elbc.c $@
 
-$(obj)ns16550.c:
+$(obj)/ns16550.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/drivers/serial/ns16550.c $@
 
-$(obj)resetvec.S:
+$(obj)/resetvec.S:
 	@rm -f $@
 	ln -s $(SRCTREE)/$(CPUDIR)/resetvec.S $@
 
-$(obj)fixed_ivor.S:
+$(obj)/fixed_ivor.S:
 	@rm -f $@
 	ln -sf $(SRCTREE)/arch/powerpc/cpu/mpc85xx/fixed_ivor.S $@
 
-$(obj)start.S: $(obj)fixed_ivor.S
+$(obj)/start.S: $(obj)/fixed_ivor.S
 	@rm -f $@
 	ln -sf $(SRCTREE)/arch/powerpc/cpu/mpc85xx/start.S $@
 
-$(obj)tlb.c:
+$(obj)/tlb.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/arch/powerpc/cpu/mpc85xx/tlb.c $@
 
-$(obj)tlb_table.c:
+$(obj)/tlb_table.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/board/$(BOARDDIR)/tlb.c $@
-
-ifneq ($(OBJTREE), $(SRCTREE))
-$(obj)nand_boot.c:
-	@rm -f $@
-	ln -s $(SRCTREE)/nand_spl/board/$(BOARDDIR)/nand_boot.c $@
-endif
-
-#########################################################################
-
-$(obj)%.o:	$(obj)%.S
-	$(CC) $(AFLAGS) -c -o $@ $<
-
-$(obj)%.o:	$(obj)%.c
-	$(CC) $(CFLAGS) -c -o $@ $<
diff --git a/nand_spl/board/freescale/mpc8572ds/Makefile b/nand_spl/board/freescale/mpc8572ds/Makefile
index 5d9953b..f711cf3 100644
--- a/nand_spl/board/freescale/mpc8572ds/Makefile
+++ b/nand_spl/board/freescale/mpc8572ds/Makefile
@@ -22,8 +22,8 @@ SOBJS	= start.o resetvec.o
 COBJS	= cache.o cpu_init_early.o spl_minimal.o fsl_law.o law.o \
 	  nand_boot.o nand_boot_fsl_elbc.o ns16550.o tlb.o tlb_table.o
 
-SRCS	:= $(addprefix $(obj),$(SOBJS:.o=.S) $(COBJS:.o=.c))
-OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))
+SRCS	:= $(addprefix $(obj)/,$(SOBJS:.o=.S) $(COBJS:.o=.c))
+OBJS	:= $(addprefix $(obj)/,$(SOBJS) $(COBJS))
 __OBJS	:= $(SOBJS) $(COBJS)
 LNDIR	:= $(nandobj)board/$(BOARDDIR)
 
@@ -45,64 +45,50 @@ $(nandobj)u-boot-nand_spl.lds: $(LDSCRIPT)
 
 # create symbolic links for common files
 
-$(obj)cache.c:
+$(obj)/cache.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/arch/powerpc/lib/cache.c $@
 
-$(obj)cpu_init_early.c:
+$(obj)/cpu_init_early.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/arch/powerpc/cpu/mpc85xx/cpu_init_early.c $@
 
-$(obj)spl_minimal.c:
+$(obj)/spl_minimal.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/arch/powerpc/cpu/mpc85xx/spl_minimal.c $@
 
-$(obj)fsl_law.c:
+$(obj)/fsl_law.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/arch/powerpc/cpu/mpc8xxx/law.c $@
 
-$(obj)law.c:
+$(obj)/law.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/board/$(BOARDDIR)/law.c $@
 
-$(obj)nand_boot_fsl_elbc.c:
+$(obj)/nand_boot_fsl_elbc.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/nand_spl/nand_boot_fsl_elbc.c $@
 
-$(obj)ns16550.c:
+$(obj)/ns16550.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/drivers/serial/ns16550.c $@
 
-$(obj)resetvec.S:
+$(obj)/resetvec.S:
 	@rm -f $@
 	ln -s $(SRCTREE)/$(CPUDIR)/resetvec.S $@
 
-$(obj)fixed_ivor.S:
+$(obj)/fixed_ivor.S:
 	@rm -f $@
 	ln -sf $(SRCTREE)/arch/powerpc/cpu/mpc85xx/fixed_ivor.S $@
 
-$(obj)start.S: $(obj)fixed_ivor.S
+$(obj)/start.S: $(obj)/fixed_ivor.S
 	@rm -f $@
 	ln -sf $(SRCTREE)/arch/powerpc/cpu/mpc85xx/start.S $@
 
-$(obj)tlb.c:
+$(obj)/tlb.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/arch/powerpc/cpu/mpc85xx/tlb.c $@
 
-$(obj)tlb_table.c:
+$(obj)/tlb_table.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/board/$(BOARDDIR)/tlb.c $@
-
-ifneq ($(OBJTREE), $(SRCTREE))
-$(obj)nand_boot.c:
-	@rm -f $@
-	ln -s $(SRCTREE)/nand_spl/board/$(BOARDDIR)/nand_boot.c $@
-endif
-
-#########################################################################
-
-$(obj)%.o:	$(obj)%.S
-	$(CC) $(AFLAGS) -c -o $@ $<
-
-$(obj)%.o:	$(obj)%.c
-	$(CC) $(CFLAGS) -c -o $@ $<
diff --git a/nand_spl/board/freescale/p1023rds/Makefile b/nand_spl/board/freescale/p1023rds/Makefile
index 652590d..21a6920 100644
--- a/nand_spl/board/freescale/p1023rds/Makefile
+++ b/nand_spl/board/freescale/p1023rds/Makefile
@@ -18,8 +18,8 @@ SOBJS	= start.o resetvec.o
 COBJS	= cache.o cpu_init_early.o spl_minimal.o fsl_law.o law.o \
 	  nand_boot.o nand_boot_fsl_elbc.o ns16550.o tlb.o tlb_table.o
 
-SRCS	:= $(addprefix $(obj),$(SOBJS:.o=.S) $(COBJS:.o=.c))
-OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))
+SRCS	:= $(addprefix $(obj)/,$(SOBJS:.o=.S) $(COBJS:.o=.c))
+OBJS	:= $(addprefix $(obj)/,$(SOBJS) $(COBJS))
 __OBJS	:= $(SOBJS) $(COBJS)
 LNDIR	:= $(nandobj)board/$(BOARDDIR)
 
@@ -41,64 +41,50 @@ $(nandobj)u-boot-nand_spl.lds: $(LDSCRIPT)
 
 # create symbolic links for common files
 
-$(obj)cache.c:
+$(obj)/cache.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/arch/powerpc/lib/cache.c $@
 
-$(obj)cpu_init_early.c:
+$(obj)/cpu_init_early.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/$(CPUDIR)/cpu_init_early.c $@
 
-$(obj)spl_minimal.c:
+$(obj)/spl_minimal.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/$(CPUDIR)/spl_minimal.c $@
 
-$(obj)fsl_law.c:
+$(obj)/fsl_law.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/arch/powerpc/cpu/mpc8xxx/law.c $@
 
-$(obj)law.c:
+$(obj)/law.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/board/$(BOARDDIR)/law.c $@
 
-$(obj)nand_boot_fsl_elbc.c:
+$(obj)/nand_boot_fsl_elbc.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/nand_spl/nand_boot_fsl_elbc.c $@
 
-$(obj)ns16550.c:
+$(obj)/ns16550.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/drivers/serial/ns16550.c $@
 
-$(obj)resetvec.S:
+$(obj)/resetvec.S:
 	@rm -f $@
 	ln -s $(SRCTREE)/$(CPUDIR)/resetvec.S $@
 
-$(obj)fixed_ivor.S:
+$(obj)/fixed_ivor.S:
 	@rm -f $@
 	ln -sf $(SRCTREE)/$(CPUDIR)/fixed_ivor.S $@
 
-$(obj)start.S: $(obj)fixed_ivor.S
+$(obj)/start.S: $(obj)/fixed_ivor.S
 	@rm -f $@
 	ln -sf $(SRCTREE)/$(CPUDIR)/start.S $@
 
-$(obj)tlb.c:
+$(obj)/tlb.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/$(CPUDIR)/tlb.c $@
 
-$(obj)tlb_table.c:
+$(obj)/tlb_table.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/board/$(BOARDDIR)/tlb.c $@
-
-ifneq ($(OBJTREE), $(SRCTREE))
-$(obj)nand_boot.c:
-	@rm -f $@
-	ln -s $(SRCTREE)/nand_spl/board/$(BOARDDIR)/nand_boot.c $@
-endif
-
-#########################################################################
-
-$(obj)%.o:	$(obj)%.S
-	$(CC) $(AFLAGS) -c -o $@ $<
-
-$(obj)%.o:	$(obj)%.c
-	$(CC) $(CFLAGS) -c -o $@ $<
diff --git a/nand_spl/board/freescale/p1_p2_rdb/Makefile b/nand_spl/board/freescale/p1_p2_rdb/Makefile
index 5d9953b..f711cf3 100644
--- a/nand_spl/board/freescale/p1_p2_rdb/Makefile
+++ b/nand_spl/board/freescale/p1_p2_rdb/Makefile
@@ -22,8 +22,8 @@ SOBJS	= start.o resetvec.o
 COBJS	= cache.o cpu_init_early.o spl_minimal.o fsl_law.o law.o \
 	  nand_boot.o nand_boot_fsl_elbc.o ns16550.o tlb.o tlb_table.o
 
-SRCS	:= $(addprefix $(obj),$(SOBJS:.o=.S) $(COBJS:.o=.c))
-OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))
+SRCS	:= $(addprefix $(obj)/,$(SOBJS:.o=.S) $(COBJS:.o=.c))
+OBJS	:= $(addprefix $(obj)/,$(SOBJS) $(COBJS))
 __OBJS	:= $(SOBJS) $(COBJS)
 LNDIR	:= $(nandobj)board/$(BOARDDIR)
 
@@ -45,64 +45,50 @@ $(nandobj)u-boot-nand_spl.lds: $(LDSCRIPT)
 
 # create symbolic links for common files
 
-$(obj)cache.c:
+$(obj)/cache.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/arch/powerpc/lib/cache.c $@
 
-$(obj)cpu_init_early.c:
+$(obj)/cpu_init_early.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/arch/powerpc/cpu/mpc85xx/cpu_init_early.c $@
 
-$(obj)spl_minimal.c:
+$(obj)/spl_minimal.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/arch/powerpc/cpu/mpc85xx/spl_minimal.c $@
 
-$(obj)fsl_law.c:
+$(obj)/fsl_law.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/arch/powerpc/cpu/mpc8xxx/law.c $@
 
-$(obj)law.c:
+$(obj)/law.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/board/$(BOARDDIR)/law.c $@
 
-$(obj)nand_boot_fsl_elbc.c:
+$(obj)/nand_boot_fsl_elbc.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/nand_spl/nand_boot_fsl_elbc.c $@
 
-$(obj)ns16550.c:
+$(obj)/ns16550.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/drivers/serial/ns16550.c $@
 
-$(obj)resetvec.S:
+$(obj)/resetvec.S:
 	@rm -f $@
 	ln -s $(SRCTREE)/$(CPUDIR)/resetvec.S $@
 
-$(obj)fixed_ivor.S:
+$(obj)/fixed_ivor.S:
 	@rm -f $@
 	ln -sf $(SRCTREE)/arch/powerpc/cpu/mpc85xx/fixed_ivor.S $@
 
-$(obj)start.S: $(obj)fixed_ivor.S
+$(obj)/start.S: $(obj)/fixed_ivor.S
 	@rm -f $@
 	ln -sf $(SRCTREE)/arch/powerpc/cpu/mpc85xx/start.S $@
 
-$(obj)tlb.c:
+$(obj)/tlb.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/arch/powerpc/cpu/mpc85xx/tlb.c $@
 
-$(obj)tlb_table.c:
+$(obj)/tlb_table.c:
 	@rm -f $@
 	ln -sf $(SRCTREE)/board/$(BOARDDIR)/tlb.c $@
-
-ifneq ($(OBJTREE), $(SRCTREE))
-$(obj)nand_boot.c:
-	@rm -f $@
-	ln -s $(SRCTREE)/nand_spl/board/$(BOARDDIR)/nand_boot.c $@
-endif
-
-#########################################################################
-
-$(obj)%.o:	$(obj)%.S
-	$(CC) $(AFLAGS) -c -o $@ $<
-
-$(obj)%.o:	$(obj)%.c
-	$(CC) $(CFLAGS) -c -o $@ $<
diff --git a/nand_spl/board/sheldon/simpc8313/Makefile b/nand_spl/board/sheldon/simpc8313/Makefile
index 5e83abc..ca45ecd 100644
--- a/nand_spl/board/sheldon/simpc8313/Makefile
+++ b/nand_spl/board/sheldon/simpc8313/Makefile
@@ -19,8 +19,8 @@ SOBJS	= start.o ticks.o
 COBJS	= nand_boot_fsl_elbc.o $(BOARD).o sdram.o ns16550.o spl_minimal.o \
 	  time.o cache.o
 
-SRCS	:= $(addprefix $(obj),$(SOBJS:.o=.S) $(COBJS:.o=.c))
-OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))
+SRCS	:= $(addprefix $(obj)/,$(SOBJS:.o=.S) $(COBJS:.o=.c))
+OBJS	:= $(addprefix $(obj)/,$(SOBJS) $(COBJS))
 __OBJS	:= $(SOBJS) $(COBJS)
 LNDIR	:= $(nandobj)board/$(BOARDDIR)
 
@@ -41,46 +41,38 @@ $(nandobj)u-boot.lds: $(LDSCRIPT)
 
 # create symbolic links for common files
 
-$(obj)start.S:
+$(obj)/start.S:
 	@rm -f $@
 	ln -s $(SRCTREE)/arch/powerpc/cpu/mpc83xx/start.S $@
 
-$(obj)nand_boot_fsl_elbc.c:
+$(obj)/nand_boot_fsl_elbc.c:
 	@rm -f $@
 	ln -s $(SRCTREE)/nand_spl/nand_boot_fsl_elbc.c $@
 
-$(obj)sdram.c:
+$(obj)/sdram.c:
 	@rm -f $@
 	ln -s $(SRCTREE)/board/$(BOARDDIR)/sdram.c $@
 
-$(obj)$(BOARD).c:
+$(obj)/$(BOARD).c:
 	@rm -f $@
 	ln -s $(SRCTREE)/board/$(BOARDDIR)/$(BOARD).c $@
 
-$(obj)ns16550.c:
+$(obj)/ns16550.c:
 	@rm -f $@
 	ln -s $(SRCTREE)/drivers/serial/ns16550.c $@
 
-$(obj)spl_minimal.c:
+$(obj)/spl_minimal.c:
 	@rm -f $@
 	ln -s $(SRCTREE)/arch/powerpc/cpu/mpc83xx/spl_minimal.c $@
 
-$(obj)cache.c:
+$(obj)/cache.c:
 	@rm -f $@
 	ln -s $(SRCTREE)/arch/powerpc/lib/cache.c $@
 
-$(obj)time.c:
+$(obj)/time.c:
 	@rm -f $@
 	ln -s $(SRCTREE)/arch/powerpc/lib/time.c $@
 
-$(obj)ticks.S:
+$(obj)/ticks.S:
 	@rm -f $@
 	ln -s $(SRCTREE)/arch/powerpc/lib/ticks.S $@
-
-#########################################################################
-
-$(obj)%.o:	$(obj)%.S
-	$(CC) $(AFLAGS) -c -o $@ $<
-
-$(obj)%.o:	$(obj)%.c
-	$(CC) $(CFLAGS) -c -o $@ $<