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 DTS_INCDIRS =  $(SRCTREE)/board/$(VENDOR)/$(BOARD)/dts
  21 DTS_INCDIRS += $(SRCTREE)/board/$(VENDOR)/dts
  22 DTS_INCDIRS += $(SRCTREE)/arch/$(ARCH)/dts
  23
  24 DTS_CPPFLAGS := -x assembler-with-cpp -undef -D__DTS__ \
  25                 -nostdinc $(addprefix -I,$(DTS_INCDIRS))
  26
  27 DTC_FLAGS := -R 4 -p 0x1000 \
  28         $(addprefix -i ,$(DTS_INCDIRS))
  29
  30 all:    $(obj).depend $(LIB)
  31
  32 # Use a constant name for this so we can access it from C code.
  33 # objcopy doesn't seem to allow us to set the symbol name independently of
  34 # the filename.
  35 DT_BIN  := $(obj)dt.dtb
  36
  37 $(DT_BIN): $(TOPDIR)/board/$(VENDOR)/dts/$(DEVICE_TREE).dts
  38         $(CPP) $(DTS_CPPFLAGS) $< -o $(DT_BIN).dts.tmp
  39         $(DTC) $(DTC_FLAGS) -O dtb -o ${DT_BIN} $(DT_BIN).dts.tmp
  40
  41 process_lds = \
  42         $(1) | sed -r -n 's/^OUTPUT_$(2)[ ("]*([^")]*).*/\1/p'
  43
  44 # Run the compiler and get the link script from the linker
  45 GET_LDS = $(CC) $(CFLAGS) $(LDFLAGS) -Wl,--verbose 2>&1
  46
  47 $(obj)dt.o: $(DT_BIN)
  48         # We want the output format and arch.
  49         # We also hope to win a prize for ugliest Makefile / shell interaction
  50         # We look in the LDSCRIPT first.
  51         # Then try the linker which should give us the answer.
  52         # Then check it worked.
  53         [ -n "$(LDSCRIPT)" ] && \
  54                 oformat=`$(call process_lds,cat $(LDSCRIPT),FORMAT)` && \
  55                 oarch=`$(call process_lds,cat $(LDSCRIPT),ARCH)` ;\
  56         \
  57         [ -z $${oformat} ] && \
  58                 oformat=`$(call process_lds,$(GET_LDS),FORMAT)` ;\
  59         [ -z $${oarch} ] && \
  60                 oarch=`$(call process_lds,$(GET_LDS),ARCH)` ;\
  61         \
  62         [ -z $${oformat} ] && \
  63                 echo "Cannot read OUTPUT_FORMAT from lds file $(LDSCRIPT)" && \
  64                 exit 1 || true ;\
  65         [ -z $${oarch} ] && \
  66                 echo "Cannot read OUTPUT_ARCH from lds file $(LDSCRIPT)" && \
  67                 exit 1 || true ;\
  68         \
  69         cd $(dir ${DT_BIN}) && \
  70         $(OBJCOPY) -I binary -O $${oformat} -B $${oarch} \
  71                 $(notdir ${DT_BIN}) $@
  72         rm $(DT_BIN)
  73
  74 OBJS-$(CONFIG_OF_EMBED) := dt.o
  75
  76 COBJS   := $(OBJS-y)
  77
  78 OBJS    := $(addprefix $(obj),$(COBJS))
  79
  80 binary: $(DT_BIN)
  81
  82 $(LIB): $(OBJS) $(DTB)
  83         $(call cmd_link_o_target, $(OBJS))
  84
  85 #########################################################################
  86
  87 # defines $(obj).depend target
  88 include $(SRCTREE)/rules.mk
  89
  90 sinclude $(obj).depend
  91
  92 #########################################################################