From af855c685f785186630cea4ea0e30a601e9a1d82 Mon Sep 17 00:00:00 2001
From: Jonas Gorski <jogo@openwrt.org>
Date: Thu, 16 Jul 2015 11:12:52 +0000
Subject: image.mk: add a BuildDTB define

Add a Image/BuildDTB command that takes the path to an dts file and
applies the CPP using the default include directories, then uses dtc
to compile the dts as the specified output file.
Additional CPP and DTC flags can be supplied as additional arguments.

Signed-off-by: Jonas Gorski <jogo@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@46389 3c298f89-4303-0410-b956-a3cf2f4a3e73
---
 include/image.mk | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'include/image.mk')

diff --git a/include/image.mk b/include/image.mk
index 6767e76dc1..a20e090fe7 100644
--- a/include/image.mk
+++ b/include/image.mk
@@ -126,6 +126,22 @@ define Image/BuildKernel/MkFIT
 	PATH=$(LINUX_DIR)/scripts/dtc:$(PATH) mkimage -f $(KDIR)/fit-$(1).its $(KDIR)/fit-$(1)$(7).itb
 endef
 
+# $(1) source dts file
+# $(2) target dtb file
+# $(3) extra CPP flags
+# $(4) extra DTC flags
+define Image/BuildDTB
+	$(CPP) -nostdinc -x assembler-with-cpp \
+		-I$(LINUX_DIR)/arch/$(ARCH)/boot/dts \
+		-I$(LINUX_DIR)/arch/$(ARCH)/boot/dts/include \
+		-undef -D__DTS__ $(3) \
+		-o $(2).tmp $(1)
+	$(LINUX_DIR)/scripts/dtc/dtc -O dtb \
+		-i$(dir $(1)) $(4) \
+		-o $(2) $(2).tmp
+	$(RM) $(2).tmp
+endef
+
 define Image/mkfs/jffs2/sub
 		$(STAGING_DIR_HOST)/bin/mkfs.jffs2 $(3) --pad -e $(patsubst %k,%KiB,$(1)) -o $(KDIR)/root.jffs2-$(2) -d $(TARGET_DIR) -v 2>&1 1>/dev/null | awk '/^.+$$$$/'
 		$(call add_jffs2_mark,$(KDIR)/root.jffs2-$(2))
-- 
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