dts/Makefile

   1 #
   2 # Copyright (c) 2011 The Chromium OS Authors.
   3 #
   4 # See file CREDITS for list of people who contributed to this
   5 # project.
   6 #
   7 # This program is free software; you can redistribute it and/or
   8 # modify it under the terms of the GNU General Public License as
   9 # published by the Free Software Foundatio; either version 2 of
  10 # the License, or (at your option) any later version.
  11 #
  12 # This program is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License
  18 # along with this program; if not, write to the Free Software
  19 # Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  20 # MA 02111-1307 USA
  21 #
  22
  23 # This Makefile builds the internal U-Boot fdt if CONFIG_OF_CONTROL is
  24 # enabled. See doc/README.fdt-control for more details.
  25
  26 include $(TOPDIR)/config.mk
  27
  28 LIB     = $(obj)libdts.o
  29
  30 $(if $(CONFIG_DEFAULT_DEVICE_TREE),,\
  31 $(error Please define CONFIG_DEFAULT_DEVICE_TREE in your board header file))
  32 DEVICE_TREE = $(subst ",,$(CONFIG_DEFAULT_DEVICE_TREE))
  33
  34 $(if $(CONFIG_ARCH_DEVICE_TREE),,\
  35 $(error Your architecture does not have device tree support enabled. \
  36 Please define CONFIG_ARCH_DEVICE_TREE))
  37
  38 # We preprocess the device tree file provide a useful define
  39 DTS_CPPFLAGS := -x assembler-with-cpp \
  40                 -DARCH_CPU_DTS=\"$(SRCTREE)/arch/$(ARCH)/dts/$(CONFIG_ARCH_DEVICE_TREE).dtsi\" \
  41                 -DBOARD_DTS=\"$(SRCTREE)/board/$(VENDOR)/$(BOARD)/dts/$(DEVICE_TREE).dts\" \
  42                 -I$(SRCTREE)/board/$(VENDOR)/dts -I$(SRCTREE)/arch/$(ARCH)/dts
  43
  44 all:    $(obj).depend $(LIB)
  45
  46 # Use a constant name for this so we can access it from C code.
  47 # objcopy doesn't seem to allow us to set the symbol name independently of
  48 # the filename.
  49 DT_BIN  := $(obj)dt.dtb
  50
  51 $(DT_BIN): $(TOPDIR)/board/$(VENDOR)/dts/$(DEVICE_TREE).dts
  52         rc=$$( \
  53                 cat $< | $(CPP) -P $(DTS_CPPFLAGS) - | \
  54                 { { $(DTC) -R 4 -p 0x1000 -O dtb -o ${DT_BIN} - 2>&1 ; \
  55                     echo $$? >&3 ; } | \
  56                   grep -v '^DTC: dts->dtb  on file' ; \
  57                 } 3>&1 1>&2 ) ; \
  58         exit $$rc
  59
  60 process_lds = \
  61         $(1) | sed -r -n 's/^OUTPUT_$(2)[ ("]*([^")]*).*/\1/p'
  62
  63 # Run the compiler and get the link script from the linker
  64 GET_LDS = $(CC) $(CFLAGS) $(LDFLAGS) -Wl,--verbose 2>&1
  65
  66 $(obj)dt.o: $(DT_BIN)
  67         # We want the output format and arch.
  68         # We also hope to win a prize for ugliest Makefile / shell interaction
  69         # We look in the LDSCRIPT first.
  70         # Then try the linker which should give us the answer.
  71         # Then check it worked.
  72         [ -n "$(LDSCRIPT)" ] && \
  73                 oformat=`$(call process_lds,cat $(LDSCRIPT),FORMAT)` && \
  74                 oarch=`$(call process_lds,cat $(LDSCRIPT),ARCH)` ;\
  75         \
  76         [ -z $${oformat} ] && \
  77                 oformat=`$(call process_lds,$(GET_LDS),FORMAT)` ;\
  78         [ -z $${oarch} ] && \
  79                 oarch=`$(call process_lds,$(GET_LDS),ARCH)` ;\
  80         \
  81         [ -z $${oformat} ] && \
  82                 echo "Cannot read OUTPUT_FORMAT from lds file $(LDSCRIPT)" && \
  83                 exit 1 || true ;\
  84         [ -z $${oarch} ] && \
  85                 echo "Cannot read OUTPUT_ARCH from lds file $(LDSCRIPT)" && \
  86                 exit 1 || true ;\
  87         \
  88         cd $(dir ${DT_BIN}) && \
  89         $(OBJCOPY) -I binary -O $${oformat} -B $${oarch} \
  90                 $(notdir ${DT_BIN}) $@
  91         rm $(DT_BIN)
  92
  93 OBJS-$(CONFIG_OF_EMBED) := dt.o
  94
  95 COBJS   := $(OBJS-y)
  96
  97 OBJS    := $(addprefix $(obj),$(COBJS))
  98
  99 binary: $(DT_BIN)
 100
 101 $(LIB): $(OBJS) $(DTB)
 102         $(call cmd_link_o_target, $(OBJS))
 103
 104 #########################################################################
 105
 106 # defines $(obj).depend target
 107 include $(SRCTREE)/rules.mk
 108
 109 sinclude $(obj).depend
 110
 111 #########################################################################