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  • #
    # (C) Copyright 2000-2011
    # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
    #
    # (C) Copyright 2011
    # Daniel Schwierzeck, daniel.schwierzeck@googlemail.com.
    #
    # (C) Copyright 2011
    # Texas Instruments Incorporated - http://www.ti.com/
    # Aneesh V <aneesh@ti.com>
    #
    
    # SPDX-License-Identifier:	GPL-2.0+
    
    src := $(obj)
    
    # Create output directory if not already present
    _dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))
    
    
    include $(srctree)/scripts/Kbuild.include
    
    
    -include include/config/auto.conf
    
    -include $(obj)/include/autoconf.mk
    
    KBUILD_CPPFLAGS += -DCONFIG_SPL_BUILD
    ifeq ($(CONFIG_TPL_BUILD),y)
    KBUILD_CPPFLAGS += -DCONFIG_TPL_BUILD
    endif
    
    
    ifeq ($(CONFIG_TPL_BUILD),y)
    SPL_BIN := u-boot-tpl
    else
    SPL_BIN := u-boot-spl
    endif
    
    
    ifdef CONFIG_SPL_BUILD
    SPL_ := SPL_
    
    ifeq ($(CONFIG_TPL_BUILD),y)
    SPL_TPL_ := TPL_
    else
    SPL_TPL_ := SPL_
    endif
    
    else
    SPL_ :=
    
    include $(srctree)/config.mk
    
    include $(srctree)/arch/$(ARCH)/Makefile
    
    # Enable garbage collection of un-used sections for SPL
    KBUILD_CFLAGS += -ffunction-sections -fdata-sections
    LDFLAGS_FINAL += --gc-sections
    
    
    cpp_flags := $(KBUILD_CPPFLAGS) $(PLATFORM_CPPFLAGS) $(UBOOTINCLUDE) \
    							$(NOSTDINC_FLAGS)
    
    c_flags := $(KBUILD_CFLAGS) $(cpp_flags)
    
    HAVE_VENDOR_COMMON_LIB = $(if $(wildcard $(srctree)/board/$(VENDOR)/common/Makefile),y,n)
    
    libs-y += $(if $(BOARDDIR),board/$(BOARDDIR)/)
    
    libs-$(HAVE_VENDOR_COMMON_LIB) += board/$(VENDOR)/common/
    
    libs-$(CONFIG_SPL_FRAMEWORK) += common/spl/
    
    libs-y += common/init/
    
    
    # Special handling for a few options which support SPL/TPL
    ifeq ($(CONFIG_TPL_BUILD),y)
    libs-$(CONFIG_TPL_LIBCOMMON_SUPPORT) += common/ cmd/
    libs-$(CONFIG_TPL_LIBGENERIC_SUPPORT) += lib/
    else
    
    libs-$(CONFIG_SPL_LIBCOMMON_SUPPORT) += common/ cmd/
    
    libs-$(CONFIG_SPL_LIBGENERIC_SUPPORT) += lib/
    endif
    
    
    libs-$(CONFIG_SPL_LIBDISK_SUPPORT) += disk/
    
    libs-$(CONFIG_SPL_USB_GADGET_SUPPORT) += drivers/usb/dwc3/
    
    libs-y += dts/
    
    libs-y += fs/
    libs-$(CONFIG_SPL_POST_MEM_SUPPORT) += post/drivers/
    libs-$(CONFIG_SPL_NET_SUPPORT) += net/
    
    head-y		:= $(addprefix $(obj)/,$(head-y))
    libs-y		:= $(addprefix $(obj)/,$(libs-y))
    u-boot-spl-dirs	:= $(patsubst %/,%,$(filter %/, $(libs-y)))
    
    libs-y := $(patsubst %/, %/built-in.o, $(libs-y))
    
    # Add GCC lib
    
    ifeq ($(CONFIG_USE_PRIVATE_LIBGCC),y)
    
    PLATFORM_LIBGCC = arch/$(ARCH)/lib/lib.a
    
    PLATFORM_LIBS := $(filter-out %/lib.a, $(filter-out -lgcc, $(PLATFORM_LIBS))) $(PLATFORM_LIBGCC)
    
    u-boot-spl-init := $(head-y)
    u-boot-spl-main := $(libs-y)
    
    ifdef CONFIG_SPL_OF_PLATDATA
    u-boot-spl-platdata := $(obj)/dts/dt-platdata.o
    endif
    
    
    # Linker Script
    ifdef CONFIG_SPL_LDSCRIPT
    # need to strip off double quotes
    
    LDSCRIPT := $(addprefix $(srctree)/,$(CONFIG_SPL_LDSCRIPT:"%"=%))
    
    endif
    
    ifeq ($(wildcard $(LDSCRIPT)),)
    
    	LDSCRIPT := $(srctree)/board/$(BOARDDIR)/u-boot-spl.lds
    
    endif
    ifeq ($(wildcard $(LDSCRIPT)),)
    
    	LDSCRIPT := $(srctree)/$(CPUDIR)/u-boot-spl.lds
    
    ifeq ($(wildcard $(LDSCRIPT)),)
    
    	LDSCRIPT := $(srctree)/arch/$(ARCH)/cpu/u-boot-spl.lds
    
    ifeq ($(wildcard $(LDSCRIPT)),)
    $(error could not find linker script)
    endif
    
    # Special flags for CPP when processing the linker script.
    # Pass the version down so we can handle backwards compatibility
    # on the fly.
    LDPPFLAGS += \
    
    	-include $(srctree)/include/u-boot/u-boot.lds.h \
    
    	-include $(objtree)/include/config.h \
    
    	-DCPUDIR=$(CPUDIR) \
    
    	$(shell $(LD) --version | \
    	  sed -ne 's/GNU ld version \([0-9][0-9]*\)\.\([0-9][0-9]*\).*/-DLD_MAJOR=\1 -DLD_MINOR=\2/p')
    
    
    quiet_cmd_mkimage = MKIMAGE $@
    
    cmd_mkimage = $(objtree)/tools/mkimage $(MKIMAGEFLAGS_$(@F)) -d $< $@ \
    
    	$(if $(KBUILD_VERBOSE:1=), >$(MKIMAGEOUTPUT))
    
    MKIMAGEFLAGS_MLO = -T omapimage -a $(CONFIG_SPL_TEXT_BASE)
    
    MKIMAGEFLAGS_MLO.byteswap = -T omapimage -n byteswap -a $(CONFIG_SPL_TEXT_BASE)
    
    
    MLO MLO.byteswap: $(obj)/u-boot-spl.bin FORCE
    
    	$(call if_changed,mkimage)
    
    ifeq ($(CONFIG_SYS_SOC),"at91")
    
    MKIMAGEFLAGS_boot.bin = -T atmelimage
    
    ifeq ($(CONFIG_SPL_GENERATE_ATMEL_PMECC_HEADER),y)
    MKIMAGEFLAGS_boot.bin += -n $(shell $(obj)/../tools/atmel_pmecc_params)
    
    boot.bin: $(obj)/../tools/atmel_pmecc_params
    endif
    
    
    boot.bin: $(obj)/u-boot-spl.bin FORCE
    
    	$(call if_changed,mkimage)
    
    MKIMAGEFLAGS_boot.bin = -T zynqimage -R $(srctree)/$(CONFIG_BOOT_INIT_FILE)
    
    MKIMAGEFLAGS_boot.bin = -T zynqmpimage -R $(srctree)/$(CONFIG_BOOT_INIT_FILE)
    
    spl/boot.bin: $(obj)/u-boot-spl.bin FORCE
    
    ifdef CONFIG_SAMSUNG
    
    ALL-y	+= $(obj)/$(BOARD)-spl.bin
    
    ALL-y	+= $(obj)/$(SPL_BIN).sfp
    
    ifdef CONFIG_ARCH_SUNXI
    
    ALL-y	+= $(obj)/sunxi-spl.bin
    
    
    ifdef CONFIG_NAND_SUNXI
    ALL-y	+= $(obj)/sunxi-spl-with-ecc.bin
    endif
    
    ifeq ($(CONFIG_SYS_SOC),"at91")
    ALL-y	+= boot.bin
    endif
    
    
    ALL-$(CONFIG_SPL_X86_16BIT_INIT) += $(obj)/u-boot-x86-16bit-spl.bin
    
    
    ALL-$(CONFIG_ARCH_ZYNQ)		+= $(obj)/boot.bin
    ALL-$(CONFIG_ARCH_ZYNQMP)	+= $(obj)/boot.bin
    
    quiet_cmd_cat = CAT     $@
    cmd_cat = cat $(filter-out $(PHONY), $^) > $@
    
    
    quiet_cmd_copy = COPY    $@
          cmd_copy = cp $< $@
    
    
    ifeq ($(CONFIG_SPL_OF_CONTROL)$(CONFIG_OF_SEPARATE)$(CONFIG_SPL_OF_PLATDATA),yy)
    
    $(obj)/$(SPL_BIN)-dtb.bin: $(obj)/$(SPL_BIN)-nodtb.bin \
    		$(if $(CONFIG_SPL_SEPARATE_BSS),,$(obj)/$(SPL_BIN)-pad.bin) \
    
    		$(obj)/$(SPL_BIN).dtb FORCE
    	$(call if_changed,cat)
    
    
    $(obj)/$(SPL_BIN).bin: $(obj)/$(SPL_BIN)-dtb.bin FORCE
    	$(call if_changed,copy)
    else
    $(obj)/$(SPL_BIN).bin: $(obj)/$(SPL_BIN)-nodtb.bin FORCE
    	$(call if_changed,copy)
    endif
    
    # Create a file that pads from the end of u-boot-spl-nodtb.bin to bss_end
    
    $(obj)/$(SPL_BIN)-pad.bin: $(obj)/$(SPL_BIN)
    	@bss_size_str=$(shell $(NM) $< | awk 'BEGIN {size = 0} /__bss_size/ {size = $$1} END {print "ibase=16; " toupper(size)}' | bc); \
    	dd if=/dev/zero of=$@ bs=1 count=$${bss_size_str} 2>/dev/null;
    
    # Pass the original device tree file through fdtgrep twice. The first pass
    # removes any unwanted nodes (i.e. those which don't have the
    # 'u-boot,dm-pre-reloc' property and thus are not needed by SPL. The second
    # pass removes various unused properties from the remaining nodes.
    # The output is typically a much smaller device tree file.
    
    ifeq ($(CONFIG_TPL_BUILD),y)
    fdtgrep_props := -b u-boot,dm-pre-reloc -b u-boot,dm-tpl
    else
    fdtgrep_props := -b u-boot,dm-pre-reloc -b u-boot,dm-spl
    endif
    
    quiet_cmd_fdtgrep = FDTGREP $@
    
          cmd_fdtgrep = $(objtree)/tools/fdtgrep $(fdtgrep_props) -RT $< \
    
    		-n /chosen -O dtb | \
    	$(objtree)/tools/fdtgrep -r -O dtb - -o $@ \
    		$(addprefix -P ,$(subst $\",,$(CONFIG_OF_SPL_REMOVE_PROPS)))
    
    
    $(obj)/$(SPL_BIN).dtb: dts/dt.dtb $(objtree)/tools/fdtgrep FORCE
    	$(call if_changed,fdtgrep)
    
    pythonpath = PYTHONPATH=tools
    
    quiet_cmd_dtocc = DTOC C  $@
    cmd_dtocc = $(pythonpath) $(srctree)/tools/dtoc/dtoc -d $(obj)/$(SPL_BIN).dtb -o $@ platdata
    
    quiet_cmd_dtoch = DTOC H  $@
    cmd_dtoch = $(pythonpath) $(srctree)/tools/dtoc/dtoc -d $(obj)/$(SPL_BIN).dtb -o $@ struct
    
    quiet_cmd_plat = PLAT    $@
    cmd_plat = $(CC) $(c_flags) -c $< -o $@
    
    $(obj)/dts/dt-platdata.o: $(obj)/dts/dt-platdata.c include/generated/dt-structs.h
    	$(call if_changed,plat)
    
    PHONY += dts_dir
    dts_dir:
    	$(shell [ -d $(obj)/dts ] || mkdir -p $(obj)/dts)
    
    include/generated/dt-structs.h: $(obj)/$(SPL_BIN).dtb dts_dir dtoc
    	$(call if_changed,dtoch)
    
    $(obj)/dts/dt-platdata.c: $(obj)/$(SPL_BIN).dtb dts_dir dtoc
    	$(call if_changed,dtocc)
    
    dtoc: #$(objtree)/tools/_libfdt.so
    
    
    ifdef CONFIG_SAMSUNG
    
    ifdef CONFIG_VAR_SIZE_SPL
    VAR_SIZE_PARAM = --vs
    else
    VAR_SIZE_PARAM =
    endif
    
    $(obj)/$(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) $< $@
    
    quiet_cmd_objcopy = OBJCOPY $@
    cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
    
    
    OBJCOPYFLAGS_$(SPL_BIN)-nodtb.bin = $(SPL_OBJCFLAGS) -O binary \
    		$(if $(CONFIG_SPL_X86_16BIT_INIT),-R .start16 -R .resetvec)
    
    $(obj)/$(SPL_BIN)-nodtb.bin: $(obj)/$(SPL_BIN) FORCE
    
    	$(call if_changed,objcopy)
    
    OBJCOPYFLAGS_u-boot-x86-16bit-spl.bin := -O binary -j .start16 -j .resetvec
    $(obj)/u-boot-x86-16bit-spl.bin: $(obj)/u-boot-spl FORCE
    	$(call if_changed,objcopy)
    
    
    LDFLAGS_$(SPL_BIN) += -T u-boot-spl.lds $(LDFLAGS_FINAL)
    
    ifneq ($(CONFIG_SPL_TEXT_BASE),)
    LDFLAGS_$(SPL_BIN) += -Ttext $(CONFIG_SPL_TEXT_BASE)
    endif
    
    
    MKIMAGEFLAGS_$(SPL_BIN).sfp = -T socfpgaimage
    $(obj)/$(SPL_BIN).sfp: $(obj)/$(SPL_BIN).bin FORCE
    
    quiet_cmd_mksunxiboot = MKSUNXI $@
    cmd_mksunxiboot = $(objtree)/tools/mksunxiboot $< $@
    
    $(obj)/sunxi-spl.bin: $(obj)/$(SPL_BIN).bin FORCE
    
    	$(call if_changed,mksunxiboot)
    
    
    quiet_cmd_sunxi_spl_image_builder = SUNXI_SPL_IMAGE_BUILDER $@
    cmd_sunxi_spl_image_builder = $(objtree)/tools/sunxi-spl-image-builder \
    				-c $(CONFIG_NAND_SUNXI_SPL_ECC_STRENGTH)/$(CONFIG_NAND_SUNXI_SPL_ECC_SIZE) \
    				-p $(CONFIG_SYS_NAND_PAGE_SIZE) \
    				-o $(CONFIG_SYS_NAND_OOBSIZE) \
    				-u $(CONFIG_NAND_SUNXI_SPL_USABLE_PAGE_SIZE) \
    				-e $(CONFIG_SYS_NAND_BLOCK_SIZE) \
    				-s -b $< $@
    $(obj)/sunxi-spl-with-ecc.bin: $(obj)/sunxi-spl.bin
    	$(call if_changed,sunxi_spl_image_builder)
    
    
    # Rule to link u-boot-spl
    # May be overridden by arch/$(ARCH)/config.mk
    quiet_cmd_u-boot-spl ?= LD      $@
          cmd_u-boot-spl ?= (cd $(obj) && $(LD) $(LDFLAGS) $(LDFLAGS_$(@F)) \
    
    		       $(patsubst $(obj)/%,%,$(u-boot-spl-init)) --start-group \
    
    		       $(patsubst $(obj)/%,%,$(u-boot-spl-main))  \
    		       $(patsubst $(obj)/%,%,$(u-boot-spl-platdata)) \
    		       --end-group \
    
    		       $(PLATFORM_LIBS) -Map $(SPL_BIN).map -o $(SPL_BIN))
    
    $(obj)/$(SPL_BIN): $(u-boot-spl-platdata) $(u-boot-spl-init) \
    		$(u-boot-spl-main) $(obj)/u-boot-spl.lds FORCE
    
    	$(call if_changed,u-boot-spl)
    
    $(sort $(u-boot-spl-init) $(u-boot-spl-main)): $(u-boot-spl-dirs) ;
    
    PHONY += $(u-boot-spl-dirs)
    
    $(u-boot-spl-dirs): $(u-boot-spl-platdata)
    
    	$(Q)$(MAKE) $(build)=$@
    
    quiet_cmd_cpp_lds = LDS     $@
    
    cmd_cpp_lds = $(CPP) -Wp,-MD,$(depfile) $(cpp_flags) $(LDPPFLAGS) -ansi \
    		-D__ASSEMBLY__ -x assembler-with-cpp -P -o $@ $<
    
    $(obj)/u-boot-spl.lds: $(LDSCRIPT) FORCE
    
    	$(call if_changed_dep,cpp_lds)
    
    # read all saved command lines
    
    targets := $(wildcard $(sort $(targets)))
    cmd_files := $(wildcard $(obj)/.*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
    
    ifneq ($(cmd_files),)
      $(cmd_files): ;	# Do not try to update included dependency files
      include $(cmd_files)
    endif
    
    
    PHONY += FORCE
    FORCE:
    
    # 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)