2 # Copyright (c) 2011 The Chromium OS Authors.
4 # SPDX-License-Identifier: GPL-2.0+
7 # This Makefile builds the internal U-Boot fdt if CONFIG_OF_CONTROL is
8 # enabled. See doc/README.fdt-control for more details.
10 DEVICE_TREE ?= $(CONFIG_DEFAULT_DEVICE_TREE:"%"=%)
11 ifeq ($(DEVICE_TREE),)
15 ARCH_PATH := arch/$(ARCH)/dts
16 dtb_depends := arch-dtbs
21 DTB := $(ARCH_PATH)/$(DEVICE_TREE).dtb
22 dtb_depends += $(DTB:.dtb=.dts)
25 # Pass the original device tree file through fdtgrep twice. The first pass
26 # removes any unwanted nodes (i.e. those which don't have the
27 # 'u-boot,dm-pre-reloc' property and thus are not needed by SPL. The second
28 # pass removes various unused properties from the remaining nodes.
29 # The output is typically a much smaller device tree file.
30 ifeq ($(CONFIG_TPL_BUILD),y)
31 fdtgrep_props := -b u-boot,dm-pre-reloc -b u-boot,dm-tpl
33 fdtgrep_props := -b u-boot,dm-pre-reloc -b u-boot,dm-spl
35 quiet_cmd_fdtgrep = FDTGREP $@
36 cmd_fdtgrep = $(objtree)/tools/fdtgrep $(fdtgrep_props) -RT $< \
37 -n /chosen -n /config -O dtb | \
38 $(objtree)/tools/fdtgrep -r -O dtb - -o $@ \
39 $(addprefix -P ,$(subst $\",,$(CONFIG_OF_SPL_REMOVE_PROPS)))
41 $(obj)/dt-spl.dtb: $(DTB) $(objtree)/tools/fdtgrep FORCE
42 $(call if_changed,fdtgrep)
44 $(obj)/dt.dtb: $(DTB) FORCE
45 $(call if_changed,shipped)
47 targets += dt.dtb dt-spl.dtb
49 $(DTB): $(dtb_depends)
51 $(Q)$(MAKE) $(build)=$(ARCH_PATH) $@
55 echo >&2 "Device Tree Source is not correctly specified."; \
56 echo >&2 "Please define 'CONFIG_DEFAULT_DEVICE_TREE'"; \
57 echo >&2 "or build with 'DEVICE_TREE=<device_tree>' argument"; \
62 $(Q)$(MAKE) $(build)=$(ARCH_PATH) dtbs
64 .SECONDARY: $(obj)/dt.dtb.S $(obj)/dt-spl.dtb.S
67 ifeq ($(CONFIG_SPL_BUILD),y)
68 obj-$(CONFIG_OF_EMBED) := dt-spl.dtb.o
69 # support "out-of-tree" build for dtb-spl
70 $(obj)/dt-spl.dtb.o: $(obj)/dt-spl.dtb.S FORCE
71 $(call if_changed_dep,as_o_S)
73 obj-$(CONFIG_OF_EMBED) := dt.dtb.o
76 dtbs: $(obj)/dt.dtb $(obj)/dt-spl.dtb
79 clean-files := dt.dtb.S dt-spl.dtb.S
81 # Let clean descend into dts directories
82 subdir- += ../arch/arm/dts ../arch/microblaze/dts ../arch/mips/dts ../arch/sandbox/dts ../arch/x86/dts