63b4b5bae5
In some cases, an externally-built device tree binary is required to be attached to U-Boot. An example is when using image signing, since in that case the .dtb file must include the public keys. Add a DEV_TREE_BIN option to the Makefile, and update the documentation. Usage is something like: make DEV_TREE_BIN=boot/am335x-boneblack-pubkey.dtb Signed-off-by: Simon Glass <sjg@chromium.org>
49 lines
1.1 KiB
Makefile
49 lines
1.1 KiB
Makefile
#
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# Copyright (c) 2011 The Chromium OS Authors.
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#
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# SPDX-License-Identifier: GPL-2.0+
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#
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# This Makefile builds the internal U-Boot fdt if CONFIG_OF_CONTROL is
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# enabled. See doc/README.fdt-control for more details.
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DEVICE_TREE ?= $(CONFIG_DEFAULT_DEVICE_TREE:"%"=%)
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ifeq ($(DEVICE_TREE),)
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DEVICE_TREE := unset
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endif
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ifneq ($(DEV_TREE_BIN),)
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DTB := $(DEV_TREE_BIN)
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else
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DTB := arch/$(ARCH)/dts/$(DEVICE_TREE).dtb
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endif
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$(obj)/dt.dtb: $(DTB) FORCE
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$(call if_changed,shipped)
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targets += dt.dtb
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$(DTB): arch-dtbs
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$(Q)test -e $@ || ( \
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echo >&2; \
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echo >&2 "Device Tree Source is not correctly specified."; \
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echo >&2 "Please define 'CONFIG_DEFAULT_DEVICE_TREE'"; \
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echo >&2 "or build with 'DEVICE_TREE=<device_tree>' argument"; \
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echo >&2; \
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/bin/false)
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arch-dtbs:
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$(Q)$(MAKE) $(build)=arch/$(ARCH)/dts dtbs
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.SECONDARY: $(obj)/dt.dtb.S
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obj-$(CONFIG_OF_EMBED) := dt.dtb.o
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dtbs: $(obj)/dt.dtb
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@:
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clean-files := dt.dtb.S
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# Let clean descend into dts directories
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subdir- += ../arch/arm/dts ../arch/microblaze/dts ../arch/sandbox/dts ../arch/x86/dts
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