endef
+define SOURCES_TO_DTBS
+ $(notdir $(patsubst %.dts,%.dtb,$(filter %.dts,$(1))))
+endef
+
+# MAKE_FDT macro defines the targets and options to build each FDT binary
+# Arguments: (none)
+define MAKE_FDT
+ $(eval DTB_BUILD_DIR := ${BUILD_PLAT}/fdts)
+ $(eval DTBS := $(addprefix $(DTB_BUILD_DIR)/,$(call SOURCES_TO_DTBS,$(FDT_SOURCES))))
+ $(eval TEMP_DTB_DIRS := $(sort $(dir ${DTBS})))
+ # The $(dir ) function leaves a trailing / on the directory names
+ # Rip off the / to match directory names with make rule targets.
+ $(eval DTB_DIRS := $(patsubst %/,%,$(TEMP_DTB_DIRS)))
+
+$(eval $(foreach objd,${DTB_DIRS},$(call MAKE_PREREQ_DIR,${objd},${BUILD_DIR})))
+
+fdt_dirs: ${DTB_DIRS}
+
+endef
+
+# MAKE_DTB generate the Flattened device tree binary (device tree binary)
+# $(1) = output directory
+# $(2) = input dts
+define MAKE_DTB
+
+$(eval DOBJ := $(1)/$(patsubst %.dts,%.dtb,$(notdir $(2))))
+$(eval DEP := $(patsubst %.dtb,%.d,$(DOBJ)))
+
+$(DOBJ): $(2) | fdt_dirs
+ @echo " DTC $$<"
+ $$(Q)$$(DTC) $$(DTC_FLAGS) -d $(DEP) -o $$@ $$<
+
+-include $(DEP)
+
+endef
+
+# MAKE_DTBS builds flattened device tree sources
+# $(1) = output directory
+# $(2) = list of flattened device tree source files
+define MAKE_DTBS
+ $(eval DOBJS := $(filter %.dts,$(2)))
+ $(eval REMAIN := $(filter-out %.dts,$(2)))
+ $(eval $(foreach obj,$(DOBJS),$(call MAKE_DTB,$(1),$(obj))))
+
+ $(and $(REMAIN),$(error Unexpected s present: $(REMAIN)))
+endef