#
  # (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+

  #
  # 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

  -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_ :=

  SPL_TPL_ :=

  endif

  include $(srctree)/config.mk

  include $(srctree)/arch/$(ARCH)/Makefile

  include $(srctree)/scripts/Makefile.lib

  # Enable garbage collection of un-used sections for SPL
  KBUILD_CFLAGS += -ffunction-sections -fdata-sections
  LDFLAGS_FINAL += --gc-sections

  # FIX ME

  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/ env/

  libs-$(CONFIG_TPL_LIBGENERIC_SUPPORT) += lib/
  else

  libs-$(CONFIG_SPL_LIBCOMMON_SUPPORT) += common/ cmd/ env/

  libs-$(CONFIG_SPL_LIBGENERIC_SUPPORT) += lib/
  endif

  libs-$(CONFIG_SPL_LIBDISK_SUPPORT) += disk/

  libs-y += drivers/

  libs-$(CONFIG_SPL_USB_GADGET_SUPPORT) += drivers/usb/dwc3/

  libs-$(CONFIG_SPL_USB_GADGET_SUPPORT) += drivers/usb/cdns3/

  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)

  endif

  u-boot-spl-init := $(head-y)
  u-boot-spl-main := $(libs-y)

  ifdef CONFIG_$(SPL_TPL_)OF_PLATDATA

  u-boot-spl-platdata := $(obj)/dts/dt-platdata.o
  endif

  
  # Linker Script

  # First test whether there's a linker-script for the specific stage defined...
  ifneq ($(CONFIG_$(SPL_TPL_)LDSCRIPT),)

  # need to strip off double quotes

  LDSCRIPT := $(addprefix $(srctree)/,$(CONFIG_$(SPL_TPL_)LDSCRIPT:"%"=%))

  else
  # ...then fall back to the generic SPL linker-script
  ifneq ($(CONFIG_SPL_LDSCRIPT),)
  # need to strip off double quotes
  LDSCRIPT := $(addprefix $(srctree)/,$(CONFIG_SPL_LDSCRIPT:"%"=%))
  endif

  endif
  
  ifeq ($(wildcard $(LDSCRIPT)),)

  	LDSCRIPT := $(srctree)/board/$(BOARDDIR)/u-boot-spl.lds

  endif
  ifeq ($(wildcard $(LDSCRIPT)),)

  	LDSCRIPT := $(srctree)/$(CPUDIR)/u-boot-spl.lds

  endif
  ifeq ($(wildcard $(LDSCRIPT)),)

  	LDSCRIPT := $(srctree)/arch/$(ARCH)/cpu/u-boot-spl.lds

  endif
  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')

  MKIMAGEOUTPUT ?= /dev/null

  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)

  else

  ifdef CONFIG_ARCH_ZYNQ

  MKIMAGEFLAGS_boot.bin = -T zynqimage -R $(srctree)/$(CONFIG_BOOT_INIT_FILE)

  endif
  ifdef CONFIG_ARCH_ZYNQMP

  MKIMAGEFLAGS_boot.bin = -T zynqmpimage -R $(srctree)/$(CONFIG_BOOT_INIT_FILE) \
  	-n $(srctree)/$(CONFIG_PMUFW_INIT_FILE)

  endif

  spl/boot.bin: $(obj)/u-boot-spl.bin FORCE

  	$(call if_changed,mkimage)
  endif

  ALL-y	+= $(obj)/$(SPL_BIN).bin

  ifdef CONFIG_SAMSUNG

  ALL-y	+= $(obj)/$(BOARD)-spl.bin

  endif

  ifdef CONFIG_ARCH_SOCFPGA

  ALL-y	+= $(obj)/$(SPL_BIN).sfp

  endif

  ifdef CONFIG_ARCH_SUNXI

  ALL-y	+= $(obj)/sunxi-spl.bin

  
  ifdef CONFIG_NAND_SUNXI
  ALL-y	+= $(obj)/sunxi-spl-with-ecc.bin
  endif

  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

  all:	$(ALL-y)

  quiet_cmd_cat = CAT     $@
  cmd_cat = cat $(filter-out $(PHONY), $^) > $@

  quiet_cmd_copy = COPY    $@
        cmd_copy = cp $< $@

  ifneq ($(CONFIG_SPL_MULTI_DTB_FIT),y)
  FINAL_DTB_CONTAINER = $(obj)/$(SPL_BIN).dtb
  else ifeq ($(CONFIG_SPL_MULTI_DTB_FIT_LZO),y)
  FINAL_DTB_CONTAINER = $(obj)/$(SPL_BIN).multidtb.fit.lzo
  else ifeq ($(CONFIG_SPL_MULTI_DTB_FIT_GZIP),y)
  FINAL_DTB_CONTAINER = $(obj)/$(SPL_BIN).multidtb.fit.gz
  else
  FINAL_DTB_CONTAINER = $(obj)/$(SPL_BIN).multidtb.fit
  endif

  ifeq ($(CONFIG_$(SPL_TPL_)OF_CONTROL)$(CONFIG_OF_SEPARATE)$(CONFIG_$(SPL_TPL_)OF_PLATDATA),yy)

  $(obj)/$(SPL_BIN)-dtb.bin: $(obj)/$(SPL_BIN)-nodtb.bin \
  		$(if $(CONFIG_SPL_SEPARATE_BSS),,$(obj)/$(SPL_BIN)-pad.bin) \

  		$(FINAL_DTB_CONTAINER)  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;

  $(obj)/$(SPL_BIN).dtb: dts/dt-spl.dtb FORCE
  	$(call if_changed,copy)

  pythonpath = PYTHONPATH=scripts/dtc/pylibfdt

  
  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-gen.h

  	$(call if_changed,plat)
  
  PHONY += dts_dir
  dts_dir:
  	$(shell [ -d $(obj)/dts ] || mkdir -p $(obj)/dts)

  include/generated/dt-structs-gen.h: $(obj)/$(SPL_BIN).dtb dts_dir FORCE

  	$(call if_changed,dtoch)

  $(obj)/dts/dt-platdata.c: $(obj)/$(SPL_BIN).dtb dts_dir FORCE

  	$(call if_changed,dtocc)

  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) $< $@

  endif

  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)

  
  # Avoid 'Not enough room for program headers' error on binutils 2.28 onwards.
  LDFLAGS_$(SPL_BIN) += $(call ld-option, --no-dynamic-linker)

  # First try the best-match (i.e. SPL_TEXT_BASE for SPL, TPL_TEXT_BASE for TPL)
  ifneq ($(CONFIG_$(SPL_TPL_)TEXT_BASE),)
  LDFLAGS_$(SPL_BIN) += -Ttext $(CONFIG_$(SPL_TPL_)TEXT_BASE)
  else
  # And then fall back to just testing for SPL_TEXT_BASE, even if in TPL mode

  ifneq ($(CONFIG_SPL_TEXT_BASE),)
  LDFLAGS_$(SPL_BIN) += -Ttext $(CONFIG_SPL_TEXT_BASE)
  endif

  endif

  MKIMAGEFLAGS_$(SPL_BIN).sfp = -T socfpgaimage
  $(obj)/$(SPL_BIN).sfp: $(obj)/$(SPL_BIN).bin FORCE

  	$(call if_changed,mkimage)

  quiet_cmd_mksunxiboot = MKSUNXI $@

  cmd_mksunxiboot = $(objtree)/tools/mksunxiboot \
  			--default-dt $(CONFIG_DEFAULT_DEVICE_TREE) $< $@

  $(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:

  PHONY += dtbs
  dtbs:
  	$(Q)$(MAKE) $(build)=dts dtbs

  # 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)

  
  SHRUNK_ARCH_DTB = $(patsubst %,$(obj)/dts/%.dtb,$(subst ",,$(CONFIG_SPL_OF_LIST)))
  .SECONDEXPANSION:
  $(SHRUNK_ARCH_DTB): $$(patsubst $(obj)/dts/%, arch/$(ARCH)/dts/%, $$@)
  	$(call if_changed,fdtgrep)
  
  MKIMAGEFLAGS_$(SPL_BIN).multidtb.fit = -f auto -A $(ARCH) -T firmware -C none -O u-boot \
  	-n "Multi DTB fit image for $(SPL_BIN)" -E \
  	$(patsubst %,-b %,$(SHRUNK_ARCH_DTB))
  
  $(obj)/$(SPL_BIN).multidtb.fit: /dev/null $(SHRUNK_ARCH_DTB) FORCE
  	$(call if_changed,mkimage)
  
  $(obj)/$(SPL_BIN).multidtb.fit.gz: $(obj)/$(SPL_BIN).multidtb.fit
  	@gzip -kf9 $< > $@
  
  $(obj)/$(SPL_BIN).multidtb.fit.lzo: $(obj)/$(SPL_BIN).multidtb.fit
  	@lzop -f9 $< > $@