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fdt: Add DEV_TREE_BIN option to specify a device tree binary file

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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>
This commit is contained in:
Simon Glass
2014-06-02 22:04:50 -06:00
committed by Tom Rini
parent 31890ae299
commit 63b4b5bae5
3 changed files with 19 additions and 3 deletions
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4
dts/Makefile
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@@ -12,7 +12,11 @@ ifeq ($(DEVICE_TREE),)
DEVICE_TREE := unset
endif
ifneq ($(DEV_TREE_BIN),)
DTB := $(DEV_TREE_BIN)
else
DTB := arch/$(ARCH)/dts/$(DEVICE_TREE).dtb
endif
$(obj)/dt.dtb: $(DTB) FORCE
$(call if_changed,shipped)