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 $(error Your architecture does not have device tree support enabled. \
  22 Please define CONFIG_ARCH_DEVICE_TREE))
  23
  24 # We preprocess the device tree file provide a useful define
  25 DTS_CPPFLAGS := -x assembler-with-cpp \
  26                 -DARCH_CPU_DTS=\"$(SRCTREE)/arch/$(ARCH)/dts/$(CONFIG_ARCH_DEVICE_TREE).dtsi\" \
  27                 -DBOARD_DTS=\"$(SRCTREE)/board/$(VENDOR)/$(BOARD)/dts/$(DEVICE_TREE).dts\" \
  28                 -I$(SRCTREE)/board/$(VENDOR)/dts -I$(SRCTREE)/arch/$(ARCH)/dts
  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         rc=$$( \
  39                 cat $< | $(CPP) -P $(DTS_CPPFLAGS) - | \
  40                 { { $(DTC) -R 4 -p 0x1000 -O dtb -o ${DT_BIN} - 2>&1 ; \
  41                     echo $$? >&3 ; } | \
  42                   grep -v '^DTC: dts->dtb  on file' ; \
  43                 } 3>&1 1>&2 ) ; \
  44         exit $$rc
  45
  46 process_lds = \
  47         $(1) | sed -r -n 's/^OUTPUT_$(2)[ ("]*([^")]*).*/\1/p'
  48
  49 # Run the compiler and get the link script from the linker
  50 GET_LDS = $(CC) $(CFLAGS) $(LDFLAGS) -Wl,--verbose 2>&1
  51
  52 $(obj)dt.o: $(DT_BIN)
  53         # We want the output format and arch.
  54         # We also hope to win a prize for ugliest Makefile / shell interaction
  55         # We look in the LDSCRIPT first.
  56         # Then try the linker which should give us the answer.
  57         # Then check it worked.
  58         [ -n "$(LDSCRIPT)" ] && \
  59                 oformat=`$(call process_lds,cat $(LDSCRIPT),FORMAT)` && \
  60                 oarch=`$(call process_lds,cat $(LDSCRIPT),ARCH)` ;\
  61         \
  62         [ -z $${oformat} ] && \
  63                 oformat=`$(call process_lds,$(GET_LDS),FORMAT)` ;\
  64         [ -z $${oarch} ] && \
  65                 oarch=`$(call process_lds,$(GET_LDS),ARCH)` ;\
  66         \
  67         [ -z $${oformat} ] && \
  68                 echo "Cannot read OUTPUT_FORMAT from lds file $(LDSCRIPT)" && \
  69                 exit 1 || true ;\
  70         [ -z $${oarch} ] && \
  71                 echo "Cannot read OUTPUT_ARCH from lds file $(LDSCRIPT)" && \
  72                 exit 1 || true ;\
  73         \
  74         cd $(dir ${DT_BIN}) && \
  75         $(OBJCOPY) -I binary -O $${oformat} -B $${oarch} \
  76                 $(notdir ${DT_BIN}) $@
  77         rm $(DT_BIN)
  78
  79 OBJS-$(CONFIG_OF_EMBED) := dt.o
  80
  81 COBJS   := $(OBJS-y)
  82
  83 OBJS    := $(addprefix $(obj),$(COBJS))
  84
  85 binary: $(DT_BIN)
  86
  87 $(LIB): $(OBJS) $(DTB)
  88         $(call cmd_link_o_target, $(OBJS))
  89
  90 #########################################################################
  91
  92 # defines $(obj).depend target
  93 include $(SRCTREE)/rules.mk
  94
  95 sinclude $(obj).depend
  96
  97 #########################################################################