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 ifeq ($(DEVICE_TREE),)
  11 $(if $(CONFIG_DEFAULT_DEVICE_TREE),,\
  12 $(error Please define CONFIG_DEFAULT_DEVICE_TREE in your board header file))
  13 DEVICE_TREE = $(subst ",,$(CONFIG_DEFAULT_DEVICE_TREE))
  14 endif
  15
  16 DTS_INCDIRS =  $(SRCTREE)/board/$(VENDOR)/$(BOARD)/dts
  17 DTS_INCDIRS += $(SRCTREE)/board/$(VENDOR)/dts
  18 DTS_INCDIRS += $(SRCTREE)/arch/$(ARCH)/dts
  19
  20 DTS_CPPFLAGS := -x assembler-with-cpp -undef -D__DTS__ \
  21                 -nostdinc $(addprefix -I,$(DTS_INCDIRS))
  22
  23 DTC_FLAGS := -R 4 -p 0x1000 \
  24         $(addprefix -i ,$(DTS_INCDIRS))
  25
  26 # Use a constant name for this so we can access it from C code.
  27 # objcopy doesn't seem to allow us to set the symbol name independently of
  28 # the filename.
  29 DT_BIN  := $(obj)dt.dtb
  30
  31 $(DT_BIN): $(TOPDIR)/board/$(VENDOR)/dts/$(DEVICE_TREE).dts
  32         $(CPP) $(DTS_CPPFLAGS) $< -o $(DT_BIN).dts.tmp
  33         $(DTC) $(DTC_FLAGS) -O dtb -o ${DT_BIN} $(DT_BIN).dts.tmp
  34
  35 process_lds = \
  36         $(1) | sed -r -n 's/^OUTPUT_$(2)[ ("]*([^")]*).*/\1/p'
  37
  38 # Run the compiler and get the link script from the linker
  39 GET_LDS = $(CC) $(CFLAGS) $(LDFLAGS) -Wl,--verbose 2>&1
  40
  41 $(obj)dt.o: $(DT_BIN)
  42         # We want the output format and arch.
  43         # We also hope to win a prize for ugliest Makefile / shell interaction
  44         # We look in the LDSCRIPT first.
  45         # Then try the linker which should give us the answer.
  46         # Then check it worked.
  47         [ -n "$(LDSCRIPT)" ] && \
  48                 oformat=`$(call process_lds,cat $(LDSCRIPT),FORMAT)` && \
  49                 oarch=`$(call process_lds,cat $(LDSCRIPT),ARCH)` ;\
  50         \
  51         [ -z $${oformat} ] && \
  52                 oformat=`$(call process_lds,$(GET_LDS),FORMAT)` ;\
  53         [ -z $${oarch} ] && \
  54                 oarch=`$(call process_lds,$(GET_LDS),ARCH)` ;\
  55         \
  56         [ -z $${oformat} ] && \
  57                 echo "Cannot read OUTPUT_FORMAT from lds file $(LDSCRIPT)" && \
  58                 exit 1 || true ;\
  59         [ -z $${oarch} ] && \
  60                 echo "Cannot read OUTPUT_ARCH from lds file $(LDSCRIPT)" && \
  61                 exit 1 || true ;\
  62         \
  63         cd $(dir ${DT_BIN}) && \
  64         $(OBJCOPY) -I binary -O $${oformat} -B $${oarch} \
  65                 $(notdir ${DT_BIN}) $@
  66         rm $(DT_BIN)
  67
  68 obj-$(CONFIG_OF_EMBED)  := dt.o
  69
  70 binary: $(DT_BIN)