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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 | $(CPP) -P $(DTS_CPPFLAGS) $< -o $(DT_BIN).dts.tmp | |
39 | $(DTC) -R 4 -p 0x1000 -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 | ######################################################################### |