xref: /openbmc/u-boot/dts/Makefile (revision 472d5460)
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
26include $(TOPDIR)/config.mk
27
28LIB	= $(obj)libdts.o
29
30$(if $(CONFIG_DEFAULT_DEVICE_TREE),,\
31$(error Please define CONFIG_DEFAULT_DEVICE_TREE in your board header file))
32DEVICE_TREE = $(subst ",,$(CONFIG_DEFAULT_DEVICE_TREE))
33
34$(if $(CONFIG_ARCH_DEVICE_TREE),,\
35$(error Your architecture does not have device tree support enabled. \
36Please define CONFIG_ARCH_DEVICE_TREE))
37
38# We preprocess the device tree file provide a useful define
39DTS_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
44all:	$(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.
49DT_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 $$rc
59
60process_lds = \
61	$(1) | sed -r -n 's/^OUTPUT_$(2)[ ("]*([^")]*).*/\1/p'
62
63# Run the compiler and get the link script from the linker
64GET_LDS = $(CC) $(CFLAGS) $(LDFLAGS) -Wl,--verbose 2>&1
65
66$(obj)dt.o: $(DT_BIN)
67	# We want the output format and arch.
68	# We also hope to win a prize for ugliest Makefile / shell interaction
69	# We look in the LDSCRIPT first.
70	# Then try the linker which should give us the answer.
71	# Then check it worked.
72	[ -n "$(LDSCRIPT)" ] && \
73		oformat=`$(call process_lds,cat $(LDSCRIPT),FORMAT)` && \
74		oarch=`$(call process_lds,cat $(LDSCRIPT),ARCH)` ;\
75	\
76	[ -z $${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 $(DT_BIN)
92
93OBJS-$(CONFIG_OF_EMBED)	:= dt.o
94
95COBJS	:= $(OBJS-y)
96
97OBJS	:= $(addprefix $(obj),$(COBJS))
98
99binary:	$(DT_BIN)
100
101$(LIB):	$(OBJS) $(DTB)
102	$(call cmd_link_o_target, $(OBJS))
103
104#########################################################################
105
106# defines $(obj).depend target
107include $(SRCTREE)/rules.mk
108
109sinclude $(obj).depend
110
111#########################################################################
112