build: fix arch used during dts compilation

Use kernel arch for dts compilation.
Also use Image/BuildDTB to build dts for ramips.

Signed-off-by: Nikolay Martynov <mar.kolya@gmail.com>

SVN-Revision: 47823

include/image.mk

@@ -16,7 +16,7 @@ override NO_TRACE_MAKE:=$(_SINGLE)$(NO_TRACE_MAKE)
 
 KDIR=$(KERNEL_BUILD_DIR)
 KDIR_TMP=$(KDIR)/tmp
-DTS_DIR:=$(LINUX_DIR)/arch/$(ARCH)/boot/dts/
+DTS_DIR:=$(LINUX_DIR)/arch/$(LINUX_KARCH)/boot/dts
 
 IMG_PREFIX:=openwrt-$(if $(CONFIG_VERSION_FILENAMES),$(VERSION_NUMBER)-)$(BOARD)$(if $(SUBTARGET),-$(SUBTARGET))
 
@@ -143,8 +143,8 @@ endef
 # $(4) extra DTC flags
 define Image/BuildDTB
 	$(CPP) -nostdinc -x assembler-with-cpp \
-		-I$(LINUX_DIR)/arch/$(ARCH)/boot/dts \
-		-I$(LINUX_DIR)/arch/$(ARCH)/boot/dts/include \
+		-I$(DTS_DIR) \
+		-I$(DTS_DIR)/include \
 		-undef -D__DTS__ $(3) \
 		-o $(2).tmp $(1)
 	$(LINUX_DIR)/scripts/dtc/dtc -O dtb \

target/linux/ramips/image/Makefile

@@ -39,7 +39,7 @@ define Device/Default
 endef
 
 define Build/patch-dtb
-	$(LINUX_DIR)/scripts/dtc/dtc -O dtb -o $@.dtb ../dts/$(DTS).dts
+	$(call Image/BuildDTB,../dts/$(DTS).dts,$@.dtb)
 	$(STAGING_DIR_HOST)/bin/patch-dtb $@ $@.dtb
 endef