now it compiles with UART

Makefile

@@ -9,7 +9,7 @@ F_CPU       = 16000000	# CPU clock frequency [Hz]
 USE_LED     = 0	# Debug with two (defined in asmfunc.S)
 USE_UART    = 0	# Debug on Serial. 0 ... deactivate or divider of http://wormfood.net/avrbaudcalc.php for baud rate!
 #------------------------------------------------------------------
-CSRC        = main.c pff/src/pff.c diskio.c #uart/uart.c #uart/uart.c is taken out by --gc,sections if USE_UART = 0
+CSRC        = main.c pff/src/pff.c diskio.c uart/uart.c #uart/uart.c is taken out by --gc,sections if USE_UART = 0
 
 TARGET      = avr_boot
 ASRC        = asmfunc.S

README.md

@@ -41,9 +41,10 @@ This is with avr-gcc and avrdude under linux with an Atmega1284p and avrIsp mkII
 - it might already have happend!
 
 # Bootloader size
+For devices with less and more than 64kb
  - 3650 - 3700 bytes
  - 3960 - 4010 bytes debugging with USE_LED
- - ? bytes debugging with USE_UART (does not compile any more - please help)
+ - 3870 - 3930 bytes debugging with USE_UART
 
 # Serial support - Help wanted
 it should not be so difficult to fit a normal serial bootloader (with automatic baudrate detection?) into the remaining 500 bytes ... help is appreciated!

main.c

@@ -46,6 +46,12 @@ const char filename[13] ="FIRMWARE.BIN\0"; 	// EDIT FILENAME HERE
 #include <string.h>
 #include "pff/src/pff.h"
 
+#if BOOT_ADR > 0xFFFF
+  #define PGM_READ_BYTE(x) pgm_read_byte_far(x)
+#else
+  #define PGM_READ_BYTE(x) pgm_read_byte(x)
+#endif
+
 #if USE_UART
   #include "uart/uart.h"
 #endif
@@ -73,7 +79,7 @@ static uint8_t pagecmp(const DWORD fa, uint8_t buff[SPM_PAGESIZE])
 	UINT i;
 	uint8_t b_flash,b_buff;
 	for (i = 0; i < SPM_PAGESIZE; i++) {
-                b_flash = BOOT_ADR>0xFFFF ? pgm_read_byte_far(fa+i):pgm_read_byte(fa+i);
+                b_flash = PGM_READ_BYTE(fa+i);
                 b_buff = buff[i];
 		if ( b_flash != b_buff) {
 			#if USE_UART  //output first difference

uart/uart.c

@@ -12,6 +12,13 @@
 #define 	UDRE 	UDRE0
 #define 	UDR 	UDR0
 #define 	RXC 	RXC0
+
+#if BOOT_ADR > 0xFFFF
+  #define PGM_READ_BYTE(x) pgm_read_byte_far(x)
+#else
+  #define PGM_READ_BYTE(x) pgm_read_byte(x)
+#endif
+
 // Just enable the UART Tx and set baud rate for 38400 on 3.6864MHz (STK500)
 
 void UART_init(void) {
@@ -30,7 +37,7 @@ void UART_put(uint8_t c) {
 void UART_puts(const char * str) {
     char c;
     do {
-        c = pgm_read_byte_far(str++);
+        c = PGM_READ_BYTE(str++);
         if (c) {
             UART_put(c);
         }