I am wondering if anyone has ever flashed a ATMEGA2560 utilizing a WIZnet 5500? I have looked at this bootloader package but it only supports the 5100. I may have to do it myself but am a little worried as there doesn't seem to be any support/documentation online and I am not the best programmer. Any help would be greatly appreciated.


The latest Ariadne bootloader from 'codebender' is in his 'personal' GitHub repository. It has W5500 support. Per created his fork with better documentation and a hardware package earlier. The loathingKernel's repo still lacks good documentation.

I installed Per's Ariadne package over Board Manager and then I replaced the files in Per's package with files from loathingKernel's repo. The I flashed the bootloader to Mega without problems and the Ariadne bootloader worked for me over W5500.

I configured the upload from IDE too.

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  • i trying to do same, but use arduino nano + wiznet5500 board. Default configuration with tftp server on is started, but not responing for my tftp client. And I suspect 7KB of memory for the Ariadne bootloader and 26KB for the main firmware will overflow flash-memory microcontroller memory, since there is only 30KB. I'll try Mega, like you – hwak May 17 at 16:02
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    @hwak, did you reset to bootloader. for Mega there is a better library now github.com/jandrassy/ArduinoOTA – Juraj May 17 at 16:31
  • thank you. It’s a pity that Mega is very large. I would like something smaller so that it fits into standard electrical sealed boxes 100х100 millimeters – hwak May 17 at 18:33
  • @hwak, Nano Every is good, but it has no OTA solution yet. I plan to try to make one over SD card and SD bootloader. but I have too many Arduino plans and not enough free time for it. – Juraj May 17 at 18:39

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