I have a custom board with an ATMEGA644 (not ATMEGA644P) as MCU and uploaded ATmegaBOOT_644.hex bootloader (I got it from http://code.google.com/p/arduino-atmega644/) via ICSP (with AVRStudio). I used the fuse/lock bits from the enclosed boards.txt file.
I managed to upload .hex files via ICSP - AVRStudio.
The problem is uploading sketches via ARDUINO IDE (via FTDI). I followed sanguino instructions to copy the folder to Arduino but receive this error message:
avrdude: stk500_getsync(): not in sync: resp=0x00
avrdude: stk500_disable(): protocol error, expect=0x14, resp=0x00
Is there any hint?
Many thanks in advance!