dwdebug and pyupdi provide a covenient and cheap solution by using a standard TTL serial port to program debugwire and UPDI AVR MCU. You can follow below circuit to make a adapter yourself, then ...

[Daumemo] likes experimenting with DIY electronics, and like many people, eventually ran across an AVR microcontroller with a Unified Program and Debug Interface (UPDI). One option is of course to ...

From my POV, I don't think so. There might be things we can do differently for *BSD operating systems, but we'll need someone that's willing to dive deep in. I don't have much time for this, and I'm ...