kbuild: use Linux Kernel build scripts

[karo-tx-uboot.git] / spl / Makefile

diff --git a/spl/Makefile b/spl/Makefile
index 5339338b2b6a3638b78c14cc4c3c1f6c21639804..6b985d1e4ac76121e1f6df99f51eff7f652a1561 100644 (file)
--- a/spl/Makefile
+++ b/spl/Makefile
@@ -14,9 +14,25 @@
 # Based on top-level Makefile.
 #
 
+src := $(obj)
+
+# Create output directory if not already present
+_dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))
+
+include $(srctree)/scripts/Kbuild.include
+
 CONFIG_SPL_BUILD := y
 export CONFIG_SPL_BUILD
 
+KBUILD_CPPFLAGS += -DCONFIG_SPL_BUILD
+ifeq ($(CONFIG_TPL_BUILD),y)
+KBUILD_CPPFLAGS += -DCONFIG_TPL_BUILD
+endif
+
+# Enable garbage collection of un-used sections for SPL
+KBUILD_CFLAGS += -ffunction-sections -fdata-sections
+LDFLAGS_FINAL += --gc-sections
+
 ifeq ($(CONFIG_TPL_BUILD),y)
 export CONFIG_TPL_BUILD
 SPL_BIN := u-boot-tpl
@@ -26,14 +42,6 @@ endif
 
 include $(TOPDIR)/config.mk
 
-# We want the final binaries in this directory
-ifeq ($(CONFIG_TPL_BUILD),y)
-obj := $(OBJTREE)/tpl/
-SPLTREE := $(TPLTREE)
-else
-obj := $(OBJTREE)/spl/
-endif
-
 HAVE_VENDOR_COMMON_LIB = $(if $(wildcard $(SRCTREE)/board/$(VENDOR)/common/Makefile),y,n)
 
 ifdef  CONFIG_SPL_START_S_PATH
@@ -98,15 +106,16 @@ LIBS-y := $(patsubst %/, %/built-in.o, $(LIBS-y))
 
 # Add GCC lib
 ifeq ("$(USE_PRIVATE_LIBGCC)", "yes")
-PLATFORM_LIBGCC = $(SPLTREE)/arch/$(ARCH)/lib/libgcc.o
-PLATFORM_LIBS := $(filter-out %/libgcc.o, $(filter-out -lgcc, $(PLATFORM_LIBS))) $(PLATFORM_LIBGCC)
+PLATFORM_LIBS := $(SPLTREE)/arch/$(ARCH)/lib/lib.a
 endif
 
-START := $(addprefix $(SPLTREE)/,$(head-y))
-LIBS := $(addprefix $(SPLTREE)/,$(sort $(LIBS-y)))
+LIBS-y := $(sort $(LIBS-y))
+
+__START := $(head-y)
+__LIBS := $(LIBS-y)
 
-__START := $(subst $(obj),,$(START))
-__LIBS := $(subst $(obj),,$(LIBS))
+START := $(addprefix $(obj)/,$(head-y))
+LIBS := $(addprefix $(obj)/,$(LIBS-y))
 
 # Linker Script
 ifdef CONFIG_SPL_LDSCRIPT
@@ -127,8 +136,6 @@ ifeq ($(wildcard $(LDSCRIPT)),)
 $(error could not find linker script)
 endif
 
-build := -f $(TOPDIR)/scripts/Makefile.build -C
-
 # Special flags for CPP when processing the linker script.
 # Pass the version down so we can handle backwards compatibility
 # on the fly.
@@ -139,21 +146,21 @@ LDPPFLAGS += \
        $(shell $(LD) --version | \
          sed -ne 's/GNU ld version \([0-9][0-9]*\)\.\([0-9][0-9]*\).*/-DLD_MAJOR=\1 -DLD_MINOR=\2/p')
 
-$(OBJTREE)/MLO:        $(obj)u-boot-spl.bin
+$(OBJTREE)/MLO:        $(obj)/u-boot-spl.bin
        $(OBJTREE)/tools/mkimage -T omapimage \
                -a $(CONFIG_SPL_TEXT_BASE) -d $< $@
 
-$(OBJTREE)/MLO.byteswap: $(obj)u-boot-spl.bin
+$(OBJTREE)/MLO.byteswap: $(obj)/u-boot-spl.bin
        $(OBJTREE)/tools/mkimage -T omapimage -n byteswap \
                -a $(CONFIG_SPL_TEXT_BASE) -d $< $@
 
-$(OBJTREE)/SPL : $(obj)u-boot-spl.bin depend
-               $(MAKE) $(build) $(SRCTREE)/arch/arm/imx-common $@
+$(objtree)/SPL : $(obj)/u-boot-spl.bin
+               $(MAKE) $(build)=spl/arch/arm/imx-common $@
 
-ALL-y  += $(obj)$(SPL_BIN).bin
+ALL-y  += $(obj)/$(SPL_BIN).bin
 
 ifdef CONFIG_SAMSUNG
-ALL-y  += $(obj)$(BOARD)-spl.bin
+ALL-y  += $(obj)/$(BOARD)-spl.bin
 endif
 
 all:   $(ALL-y)
@@ -164,34 +171,43 @@ VAR_SIZE_PARAM = --vs
 else
 VAR_SIZE_PARAM =
 endif
-$(obj)$(BOARD)-spl.bin: $(obj)u-boot-spl.bin
+$(obj)/$(BOARD)-spl.bin: $(obj)/u-boot-spl.bin
        $(if $(wildcard $(OBJTREE)/spl/board/samsung/$(BOARD)/tools/mk$(BOARD)spl),\
        $(OBJTREE)/spl/board/samsung/$(BOARD)/tools/mk$(BOARD)spl,\
        $(OBJTREE)/tools/mkexynosspl) $(VAR_SIZE_PARAM) $< $@
 endif
 
-$(obj)$(SPL_BIN).bin:  $(obj)$(SPL_BIN)
+$(obj)/$(SPL_BIN).bin: $(obj)/$(SPL_BIN)
        $(OBJCOPY) $(OBJCFLAGS) $(SPL_OBJCFLAGS) -O binary $< $@
 
+LDFLAGS_$(SPL_BIN) += -T u-boot-spl.lds $(LDFLAGS_FINAL)
+ifneq ($(CONFIG_SPL_TEXT_BASE),)
+LDFLAGS_$(SPL_BIN) += -Ttext $(CONFIG_SPL_TEXT_BASE)
+endif
+
 GEN_UBOOT = \
        cd $(obj) && $(LD) $(LDFLAGS) $(LDFLAGS_$(@F)) $(__START) \
                --start-group $(__LIBS) --end-group $(PLATFORM_LIBS) \
                -Map $(SPL_BIN).map -o $(SPL_BIN)
 
-$(obj)$(SPL_BIN):      depend $(START) $(LIBS) $(obj)u-boot-spl.lds
+$(obj)/$(SPL_BIN): $(START) $(LIBS) $(obj)/u-boot-spl.lds
        $(GEN_UBOOT)
 
 $(START):
        @:
 
-$(LIBS):       depend
-       $(MAKE) $(build) $(SRCTREE)$(dir $(subst $(SPLTREE),,$@))
+$(LIBS):
+       $(Q)$(MAKE) $(build)=$(patsubst %/,%,$(dir $@))
+
+# FIX ME
+cpp_flags := $(KBUILD_CPPFLAGS) $(CPPFLAGS) $(UBOOTINCLUDE) $(NOSTDINC_FLAGS)
 
-$(obj)u-boot-spl.lds: $(LDSCRIPT) depend
-       $(CPP) $(CPPFLAGS) $(LDPPFLAGS) -I$(obj). -ansi -D__ASSEMBLY__ -P - < $< > $@
+$(obj)/u-boot-spl.lds: $(LDSCRIPT) FORCE
+       $(CPP) $(cpp_flags) $(LDPPFLAGS) -I$(obj). -ansi -D__ASSEMBLY__ -P - < $< > $@
 
-depend:        $(obj).depend
-.PHONY: depend
+PHONY += FORCE
+FORCE:
 
-# defines $(obj).depend target
-include $(SRCTREE)/rules.mk
+# Declare the contents of the .PHONY variable as phony.  We keep that
+# information in a variable so we can use it in if_changed and friends.
+.PHONY: $(PHONY)