Avoid hardwiring tftpboot

target/device/Atmel/DataFlashBoot/DataflashBoot.mk

@@ -34,7 +34,7 @@ dataflash:	 $(DATAFLASHBOOT_DIR)/$(DATAFLASHBOOT_BINARY)
 	mkdir -p $(BINARIES_DIR)
 	cp $(DATAFLASHBOOT_DIR)/$(DATAFLASHBOOT_BINARY)	$(BINARIES_DIR)/$(BOARD_NAME)-$(DATAFLASHBOOT_BINARY)
 ifneq	($(TARGET_ATMEL_COPYTO),)
-	cp $(DATAFLASHBOOT_DIR)/$(DATAFLASHBOOT_BINARY)	/tftpboot/$(BOARD_NAME)-$(DATAFLASHBOOT_BINARY)
+	cp $(DATAFLASHBOOT_DIR)/$(DATAFLASHBOOT_BINARY)	$(TARGET_ATMEL_COPYTO)/$(BOARD_NAME)-$(DATAFLASHBOOT_BINARY)
 endif
 
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