One bootloader for the Diecimila and NG - just different makefile targets to pass in slightly different defines.

bootloader168-diecimila/ATmegaBOOT_168.c

@@ -78,7 +78,8 @@
 /* 20060803: hacked by DojoCorp */
 /* 20070626: hacked by David A. Mellis to decrease waiting time for auto-reset */
 /* set the waiting time for the bootloader */
-#define MAX_TIME_COUNT (F_CPU>>4)
+/* get this from the Makefile instead */
+/* #define MAX_TIME_COUNT (F_CPU>>4) */
 
 /* 20070707: hacked by David A. Mellis - after this many errors give up and launch application */
 #define MAX_ERROR_COUNT 5
@@ -357,9 +358,9 @@ int main(void)
     /* flash onboard LED to signal entering of bootloader */
 #ifdef __AVR_ATmega128__
     // 4x for UART0, 5x for UART1
-    flash_led(3 + bootuart);
+    flash_led(NUM_LED_FLASHES + bootuart);
 #else
-    flash_led(1);
+    flash_led(NUM_LED_FLASHES);
 #endif
     
     /* 20050803: by DojoCorp, this is one of the parts provoking the

bootloader168-diecimila/Makefile

@@ -2,6 +2,18 @@
 # E.Lins, 18.7.2005
 # $Id$
 
+# Instructions
+#
+# To build the bootloader for the Diecimila:
+# make diecimila
+#
+# To build the bootloader for the NG/Mini:
+# make ng
+#
+# To burn the bootloader:
+# make TARGET=diecimila isp
+# make TARGET=ng isp
+
 # program name should not be changed...
 PROGRAM    = ATmegaBOOT_168
 
@@ -26,7 +38,7 @@ LDSECTION  = --section-start=.text=0x3800
 # lock it), but since the high two bits of the lock byte are
 # unused, avrdude would get confused.
 ISPFUSES    = avrdude -c $(ISPTOOL) -p m168 -P $(ISPPORT) $(ISPSPEED) -e -u -U lock:w:0x3f:m -U efuse:w:0x00:m -U hfuse:w:0xdf:m -U lfuse:w:0xff:m
-ISPFLASH    = avrdude -c $(ISPTOOL) -p m168 -P $(ISPPORT) $(ISPSPEED) -U flash:w:$(PROGRAM).hex -U lock:w:0x0f:m
+ISPFLASH    = avrdude -c $(ISPTOOL) -p m168 -P $(ISPPORT) $(ISPSPEED) -U flash:w:$(PROGRAM)_$(TARGET).hex -U lock:w:0x0f:m
 
 
 OBJ        = $(PROGRAM).o
@@ -41,37 +53,35 @@ CC         = avr-gcc
 # Override is only needed by avr-lib build system.
 
 override CFLAGS        = -g -Wall $(OPTIMIZE) -mmcu=$(MCU_TARGET) -DF_CPU=$(AVR_FREQ) $(DEFS)
-override LDFLAGS       = -Wl,-Map,$(PROGRAM).map,$(LDSECTION)
+override LDFLAGS       = -Wl,$(LDSECTION)
+#override LDFLAGS       = -Wl,-Map,$(PROGRAM).map,$(LDSECTION)
 
 OBJCOPY        = avr-objcopy
 OBJDUMP        = avr-objdump
 
-all: $(PROGRAM).elf lst text
+all:
 
-isp: $(PROGRAM).hex
+diecimila: TARGET = diecimila
+diecimila: CFLAGS += '-DMAX_TIME_COUNT=F_CPU>>4' '-DNUM_LED_FLASHES=1'
+diecimila: $(PROGRAM)_diecimila.hex
+
+ng: TARGET = ng
+ng: CFLAGS += '-DMAX_TIME_COUNT=F_CPU>>1' '-DNUM_LED_FLASHES=3'
+ng: $(PROGRAM)_ng.hex
+
+isp: $(PROGRAM)_$(TARGET).hex
 	$(ISPFUSES)
 	$(ISPFLASH)
 
-$(PROGRAM).elf: $(OBJ)
+%.elf: $(OBJ)
 	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ $(LIBS)
 
 clean:
-	rm -rf *.o *.elf *.lst *.map *.sym *.lss *.eep
-	rm -rf $(PROGRAM).hex $(PROGRAM).srec $(PROGRAM).bin
-
-lst:  $(PROGRAM).lst
+	rm -rf *.o *.elf *.lst *.map *.sym *.lss *.eep *.srec *.bin *.hex
 
 %.lst: %.elf
 	$(OBJDUMP) -h -S $< > $@
 
-# Rules for building the .text rom images
-
-text: hex bin srec
-
-hex:  $(PROGRAM).hex
-bin:  $(PROGRAM).bin
-srec: $(PROGRAM).srec
-
 %.hex: %.elf
 	$(OBJCOPY) -j .text -j .data -O ihex $< $@