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Danni's bootloader (fast tiny & mega UART bootloader) is fast and tiny, and works on many AVRs just by including the part's ".INC" assembly description file.http://www.avrfreaks.net/index.php?module=Freaks%20Academy&func=viewItem&item_id=1008&item_type=projectIts only short-coming is that the program that talks to the bootloader is written for DOS, with at least one Windows version floating around the net.Then, Andreas Butti contributed an almost-working linux version here:http://www.mikrocontroller.net/attachment/35618/Bootloader21_20080510.tar.gzFinally yours truly finished it off and made it work on OS X and Linux.Speed:ATmega164P @ 18.432 MHz; 200 MHz Linux/ARM9 SBC @ 115200 baudFlash/Verify: 13563 bytes in 2.51 secondsVerify: 13563 bytes in 1.57 secondsOptions added in new version (1.1):* Optional character sequence to send to AVR to initiate reboot* Optional limit on retries to connect to AVR's bootloader* Optional silencing of all output except errors* Errors to stderr, exit 0 on success and -1 on failure