diff --git a/make/mcu-defs.mk b/make/mcu-defs.mk
new file mode 100644
index 00000000..6c575043
--- /dev/null
+++ b/make/mcu-defs.mk
@@ -0,0 +1,52 @@
+#PROJECT                      ?= $(shell cd $(TOPDIR); /bin/pwd | xargs notdir)
+
+#define mcu_check_var
+#  ifeq ($($(1)),)
+#    $(error $(1) not specified)
+#  endif
+#endef
+
+ifeq ($(MCU_BOARD_MODEL),)
+  error MCU_BOARD_MODEL not specified
+endif
+
+ifeq ($(MCU_FLASH_OFFSET),)
+  error MCU_FLASH_OFFSET not specified
+endif
+
+ifeq ($(MCU_FLASH_SIZE),)
+  error MCU_FLASH_SIZE not specified
+endif
+
+MCU_BOARD_MODEL_LC           ?= $(shell echo $(MCU_BOARD_MODEL) | tr '[A-Z]' '[a-z]')
+MCU_BOARD                    ?= $(MCU_BOARD_MODEL)
+MCU_BOARD_LC                 ?= $(shell echo $(MCU_BOARD) | tr '[A-Z]' '[a-z]')
+
+MCU_OPENOCD_CFG_FILE         ?= $(TOPDIR)/make/openocd-$(MCU_BOARD_LC).cfg
+MCU_OPENOCD_OPTS             ?= -f $(MCU_OPENOCD_CFG_FILE) -c "echo \"Started by jw-build\"" -c "gdb_port 3333" -c "telnet_port 4444" -c "tcl_port 6666"
+MCU_OPENOCD_BIN              ?= openocd
+MCU_OPENOCD                  ?= $(MCU_OPENOCD_BIN) $(MCU_OPENOCD_OPTS)
+
+MCU_FLASH_FETCH_BANK         ?=  $(MCU_FLASH_BANK)
+MCU_FLASH_FETCH_FILE_BIN     ?=  $(MCU_FLASH_FILE_BIN)
+MCU_FLASH_FETCH_FILE_HEX     ?=  $(MCU_FLASH_FILE_HEX)
+MCU_FLASH_FETCH_OFFSET       ?=  $(MCU_FLASH_OFFSET)
+MCU_FLASH_FETCH_SIZE         ?=  $(MCU_FLASH_SIZE)
+
+MCU_FLASH_PUSH_BANK          ?=  $(MCU_FLASH_BANK)
+MCU_FLASH_PUSH_FILE_BIN      ?=  $(MCU_FLASH_FILE_BIN)
+MCU_FLASH_PUSH_FILE_HEX      ?=  $(MCU_FLASH_FILE_HEX)
+MCU_FLASH_PUSH_OFFSET        ?=  $(MCU_FLASH_OFFSET)
+MCU_FLASH_PUSH_SIZE          ?=  $(MCU_FLASH_SIZE)
+
+TOOLCHAIN_PREFIX             ?= arm-none-eabi-
+MCU_OBJCOPY                  ?= $(TOOLCHAIN_PREFIX)objcopy
+MCU_FLASH_BANK               ?= 0
+MCU_FLASH_FILE_BIN           ?= $(TOPDIR)/bin/$(MCU_BOARD_LC).bin
+MCU_FLASH_FILE_HEX           ?= $(TOPDIR)/bin/$(MCU_BOARD_LC).hex
+#MCU_FLASH_OFFSET             ?= 0x0000000
+#MCU_FLASH_SIZE               ?= 0x5000
+
+ifneq ($(MCU_FLASH_FETCH_OFFSET),)
+  MCU_OBJCOPY_FETCH_OPTS     += --change-addresses $(MCU_FLASH_FETCH_OFFSET)
+endif
diff --git a/make/mcu-topdir.mk b/make/mcu-topdir.mk
new file mode 100644
index 00000000..92412391
--- /dev/null
+++ b/make/mcu-topdir.mk
@@ -0,0 +1,24 @@
+include $(MODDIR)/make/mcu-defs.mk
+include $(MODDIR)/make/topdir.mk
+
+.PHONY: flash-fetch flash-push flash-clean-fetch flash-clean-push
+
+all:
+
+flash-fetch: $(MCU_FLASH_FETCH_FILE_HEX)
+clean: flash-clean-fetch
+flash-clean-fetch:
+	rm -f $(MCU_FLASH_FETCH_FILE_BIN) $(MCU_FLASH_FETCH_FILE_HEX) *.tmp
+flash-clean-push:
+	rm -f $(MCU_FLASH_PUSH_FILE_BIN) $(MCU_FLASH_PUSH_FILE_HEX) *.tmp
+$(MCU_FLASH_FETCH_FILE_BIN):
+	$(MCU_OPENOCD) -c "init" -c "reset init" -c "flash read_bank $(MCU_FLASH_FETCH_BANK) $@.tmp $(MCU_FLASH_FETCH_OFFSET) $(MCU_FLASH_FETCH_SIZE)" -c "exit"
+	mv $@.tmp $@
+%.hex: %.bin
+	$(MCU_OBJCOPY) $(MCU_OBJCOPY_FETCH_OPTS) -I binary -O ihex $< $@.tmp
+	mv $@.tmp $@
+flash-push: 
+	# see http://openocd.org/doc/html/Flash-Programming.html
+	$(MCU_OPENOCD) -c "program $(MCU_FLASH_PUSH_FILE_HEX) verify reset exit $(MCU_FLASH_PUSH_OFFSET)"
+%-flash-push:
+	MCU_FLASH_PUSH_FILE_HEX=$* make flash-push