Add burn_bootloader target

Code to burn fuses is moved from ispload target to this new target, so
that fuses are burned only once when needed.

Fix #85

HISTORY.md

@@ -8,6 +8,7 @@ I tried to give credit whenever possible. If I have missed anyone, kindly add it
 - Don't append port details to avrdude for usbasp. See #123
 - Ignore commented lines while parsing boards.txt file. See #124
 - In ISP mode, read baudrate and programmer from boards.txt. See #125
+- Add `burn_bootloader` target. See #85
 
 ### 1.0.1 (2013-09-25)
 - Unconditionally add -D in avrdude options. See #114

arduino-mk/Arduino.mk

@@ -559,6 +559,14 @@ ifeq ($(strip $(NO_CORE)),)
         ISP_EXT_FUSE = $(call PARSE_BOARD,$(BOARD_TAG),bootloader.extended_fuses)
     endif
 
+    ifndef BOOTLOADER_PATH
+        BOOTLOADER_PATH = $(call PARSE_BOARD,$(BOARD_TAG),bootloader.path)
+    endif
+
+    ifndef BOOTLOADER_FILE
+        BOOTLOADER_FILE = $(call PARSE_BOARD,$(BOARD_TAG),bootloader.file)
+    endif
+
     ifndef ISP_LOCK_FUSE_POST
         ISP_LOCK_FUSE_POST = $(call PARSE_BOARD,$(BOARD_TAG),bootloader.lock_bits)
     endif
@@ -991,13 +999,19 @@ ifndef AVRDUDE_ISP_BAUDRATE
     endif
 endif
 
+# Fuse settings copied from Arduino IDE.
+# https://github.com/arduino/Arduino/blob/master/app/src/processing/app/debug/AvrdudeUploader.java#L254
+
 # Pre fuse settings
 ifndef AVRDUDE_ISP_FUSES_PRE
-
     ifneq ($(strip $(ISP_LOCK_FUSE_PRE)),)
         AVRDUDE_ISP_FUSES_PRE += -U lock:w:$(ISP_LOCK_FUSE_PRE):m
     endif
 
+    ifneq ($(strip $(ISP_EXT_FUSE)),)
+        AVRDUDE_ISP_FUSES_PRE += -U efuse:w:$(ISP_EXT_FUSE):m
+    endif
+
     ifneq ($(strip $(ISP_HIGH_FUSE)),)
         AVRDUDE_ISP_FUSES_PRE += -U hfuse:w:$(ISP_HIGH_FUSE):m
     endif
@@ -1005,11 +1019,16 @@ ifndef AVRDUDE_ISP_FUSES_PRE
     ifneq ($(strip $(ISP_LOW_FUSE)),)
         AVRDUDE_ISP_FUSES_PRE += -U lfuse:w:$(ISP_LOW_FUSE):m
     endif
+endif
 
-    ifneq ($(strip $(ISP_EXT_FUSE)),)
+# Bootloader file settings
-        AVRDUDE_ISP_FUSES_PRE += -U efuse:w:$(ISP_EXT_FUSE):m
+# TODO: Handle relative bootloader file path as well
+ifndef AVRDUDE_ISP_BURN_BOOTLOADER
+    ifneq ($(strip $(BOOTLOADER_PATH)),)
+        ifneq ($(strip $(BOOTLOADER_FILE)),)
+            AVRDUDE_ISP_BURN_BOOTLOADER += -U flash:w:$(BOOTLOADER_PATH)/$(BOOTLOADER_FILE):i
+        endif
     endif
-
 endif
 
 # Post fuse settings
@@ -1102,12 +1121,17 @@ reset_stty:
 		$$STTYF $(call get_monitor_port) -hupcl
 
 ispload:	$(TARGET_EEP) $(TARGET_HEX) verify_size
-ifdef AVRDUDE_ISP_FUSES_PRE
-		$(AVRDUDE) $(AVRDUDE_COM_OPTS) $(AVRDUDE_ISP_OPTS) -e $(AVRDUDE_ISP_FUSES_PRE)
-endif
 		$(AVRDUDE) $(AVRDUDE_COM_OPTS) $(AVRDUDE_ISP_OPTS) \
 			$(AVRDUDE_ISPLOAD_OPTS)
-ifdef AVRDUDE_ISP_FUSES_POST
+
+burn_bootloader:
+ifneq ($(strip $(AVRDUDE_ISP_FUSES_PRE)),)
+		$(AVRDUDE) $(AVRDUDE_COM_OPTS) $(AVRDUDE_ISP_OPTS) -e $(AVRDUDE_ISP_FUSES_PRE)
+endif
+ifneq ($(strip $(AVRDUDE_ISP_BURN_BOOTLOADER)),)
+		$(AVRDUDE) $(AVRDUDE_COM_OPTS) $(AVRDUDE_ISP_OPTS) $(AVRDUDE_ISP_BURN_BOOTLOADER)
+endif
+ifneq ($(strip $(AVRDUDE_ISP_FUSES_POST)),)
 		$(AVRDUDE) $(AVRDUDE_COM_OPTS) $(AVRDUDE_ISP_OPTS) $(AVRDUDE_ISP_FUSES_POST)
 endif
 
@@ -1163,13 +1187,14 @@ help:
                           the capacity of the micro controller.\n\
   make eeprom           - upload the eep file\n\
   make raw_eeprom       - upload the eep file without first resetting\n\
+  make burn_bootloader  - Burn bootloader and/or fuses\n\
   make help             - show this help\n\
 "
 	@$(ECHO) "Please refer to $(ARDMK_DIR)/arduino-mk/Arduino.mk for more details."
 
 .PHONY: all upload raw_upload raw_eeprom error_on_caterina reset reset_stty ispload \
         clean depends size show_boards monitor disasm symbol_sizes generated_assembly \
-        generate_assembly verify_size help
+        generate_assembly verify_size burn_bootloader help
 
 # added - in the beginning, so that we don't get an error if the file is not present
 -include $(DEPS)