dts/Makefile

   1 #
   2 # Copyright (c) 2011 The Chromium OS Authors.
   3 #
   4 # SPDX-License-Identifier:      GPL-2.0+
   5 #
   6
   7 # This Makefile builds the internal U-Boot fdt if CONFIG_OF_CONTROL is
   8 # enabled. See doc/README.fdt-control for more details.
   9
  10 include $(TOPDIR)/config.mk
  11
  12 LIB     = $(obj)libdts.o
  13
  14 ifeq ($(DEVICE_TREE),)
  15 $(if $(CONFIG_DEFAULT_DEVICE_TREE),,\
  16 $(error Please define CONFIG_DEFAULT_DEVICE_TREE in your board header file))
  17 DEVICE_TREE = $(subst ",,$(CONFIG_DEFAULT_DEVICE_TREE))
  18 endif
  19
  20 $(if $(CONFIG_ARCH_DEVICE_TREE),,\
  21 $(error Your architecture does not have device tree support enabled. \
  22 Please define CONFIG_ARCH_DEVICE_TREE))
  23
  24 DTS_INCDIRS =  $(SRCTREE)/board/$(VENDOR)/$(BOARD)/dts
  25 DTS_INCDIRS += $(SRCTREE)/board/$(VENDOR)/dts
  26 DTS_INCDIRS += $(SRCTREE)/arch/$(ARCH)/dts
  27
  28 # We preprocess the device tree file provide a useful define
  29 DTS_CPPFLAGS := -x assembler-with-cpp \
  30                 -DARCH_CPU_DTS=\"$(SRCTREE)/arch/$(ARCH)/dts/$(CONFIG_ARCH_DEVICE_TREE).dtsi\" \
  31                 -DBOARD_DTS=\"$(SRCTREE)/board/$(VENDOR)/$(BOARD)/dts/$(DEVICE_TREE).dts\" \
  32                 -nostdinc $(addprefix -I,$(DTS_INCDIRS))
  33
  34 DTC_FLAGS := -R 4 -p 0x1000 \
  35         $(addprefix -i ,$(DTS_INCDIRS))
  36
  37 all:    $(obj).depend $(LIB)
  38
  39 # Use a constant name for this so we can access it from C code.
  40 # objcopy doesn't seem to allow us to set the symbol name independently of
  41 # the filename.
  42 DT_BIN  := $(obj)dt.dtb
  43
  44 $(DT_BIN): $(TOPDIR)/board/$(VENDOR)/dts/$(DEVICE_TREE).dts
  45         $(CPP) -P $(DTS_CPPFLAGS) $< -o $(DT_BIN).dts.tmp
  46         $(DTC) $(DTC_FLAGS) -O dtb -o ${DT_BIN} $(DT_BIN).dts.tmp
  47
  48 process_lds = \
  49         $(1) | sed -r -n 's/^OUTPUT_$(2)[ ("]*([^")]*).*/\1/p'
  50
  51 # Run the compiler and get the link script from the linker
  52 GET_LDS = $(CC) $(CFLAGS) $(LDFLAGS) -Wl,--verbose 2>&1
  53
  54 $(obj)dt.o: $(DT_BIN)
  55         # We want the output format and arch.
  56         # We also hope to win a prize for ugliest Makefile / shell interaction
  57         # We look in the LDSCRIPT first.
  58         # Then try the linker which should give us the answer.
  59         # Then check it worked.
  60         [ -n "$(LDSCRIPT)" ] && \
  61                 oformat=`$(call process_lds,cat $(LDSCRIPT),FORMAT)` && \
  62                 oarch=`$(call process_lds,cat $(LDSCRIPT),ARCH)` ;\
  63         \
  64         [ -z $${oformat} ] && \
  65                 oformat=`$(call process_lds,$(GET_LDS),FORMAT)` ;\
  66         [ -z $${oarch} ] && \
  67                 oarch=`$(call process_lds,$(GET_LDS),ARCH)` ;\
  68         \
  69         [ -z $${oformat} ] && \
  70                 echo "Cannot read OUTPUT_FORMAT from lds file $(LDSCRIPT)" && \
  71                 exit 1 || true ;\
  72         [ -z $${oarch} ] && \
  73                 echo "Cannot read OUTPUT_ARCH from lds file $(LDSCRIPT)" && \
  74                 exit 1 || true ;\
  75         \
  76         cd $(dir ${DT_BIN}) && \
  77         $(OBJCOPY) -I binary -O $${oformat} -B $${oarch} \
  78                 $(notdir ${DT_BIN}) $@
  79         rm $(DT_BIN)
  80
  81 OBJS-$(CONFIG_OF_EMBED) := dt.o
  82
  83 COBJS   := $(OBJS-y)
  84
  85 OBJS    := $(addprefix $(obj),$(COBJS))
  86
  87 binary: $(DT_BIN)
  88
  89 $(LIB): $(OBJS) $(DTB)
  90         $(call cmd_link_o_target, $(OBJS))
  91
  92 #########################################################################
  93
  94 # defines $(obj).depend target
  95 include $(SRCTREE)/rules.mk
  96
  97 sinclude $(obj).depend
  98
  99 #########################################################################