From c67d48b6021a03006c8da8fa8c643662563b1050 Mon Sep 17 00:00:00 2001
From: Jon Langseth <jon.langseth@lilug.no>
Date: Sun, 30 Jun 2013 01:12:36 +0200
Subject: [PATCH] CORRECTION * Updated to correctly support bootloader
 programming w/Optiboot.

Removed ERRORS in Makefile setting incorrect fusebits and lockbits.

Get Optiboot v4.4 from https://code.google.com/p/optiboot/downloads/list

Use Optiboot v4.4, modify target optiboot-target "atmega328" and set AVR_FREQ to
atmega328: AVR_FREQ = 20000000L

Reccomended to also change the LED pin definitions in pin_defs.h of Optiboot:
#define LED_DDR     DDRD
#define LED_PORT    PORTD
#define LED_PIN     PIND
#define LED         PIND6
---
 Makefile | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/Makefile b/Makefile
index 2569c38..18de3f6 100644
--- a/Makefile
+++ b/Makefile
@@ -241,7 +241,7 @@ FUSES =
 ifdef FUSE_EXT
 FUSES += -U efuse:w:$(FUSE_EXT):m
 endif
-FUSES += -U efuse:w:$(FUSE_EXT):m
+FUSES += -U hfuse:w:$(FUSE_HIGH):m
 FUSES += -U lfuse:w:$(FUSE_LOW):m
 
 fusebits: $(TARGET).hex
@@ -251,10 +251,7 @@ lockbits: $(TARGET).hex
 	$(AVRDUDE) -p $(MCU) $(AVRDUDE_PROG) -e -u -U lock:w:$(FUSE_LOCK):m
 
 bl_fusebits: $(TARGET).hex
-	$(AVRDUDE) -p $(MCU) $(AVRDUDE_PROG) -U efuse:w:$(BL_FUSE_EXT):m -U efuse:w:$(BL_FUSE_EXT):m -U lfuse:w:$(BL_FUSE_LOW):m
-	
-bl_lockbits: $(TARGET).hex
-	$(AVRDUDE)-p $(MCU) $(AVRDUDE_PROG) -e -u -U lock:w:$(BL_FUSE_LOCK):m
+	$(AVRDUDE) -p $(MCU) $(AVRDUDE_PROG) -U efuse:w:$(BL_FUSE_EXT):m -U hfuse:w:$(BL_FUSE_HIGH):m -U lfuse:w:$(BL_FUSE_LOW):m
 
 # Convert ELF to COFF for use in debugging / simulating in AVR Studio or VMLAB.
 COFFCONVERT=$(OBJCOPY) --debugging \
-- 
2.39.2