[bug #61624] [Feature request] Serial/UART UPDI programmers

[mcudude]

Follow-up Comment #18, bug #61624 (project avrdude):

I just tested reading from and writing to EEPROM on an ATmega4808 and
ATmega4809, and it seems to work just fine. I've loaded various hex files, and
the content read from EEPROM is always correct. It's also very fast, reading
and writing take about a second, reading a little shorter perhaps.

>Anyway, what I'm saying is that you should be able to test with these attiny
chips, as long as you test flash and fuses. 

Great! I'll test them later tonight. I have to do some soldering in order to
free up the UPDI pin.

> Now, for the message at the end (lfuse/hfuse/efuse) - that's another
interesting thing, but it's a part of core AVRDUDE code. I will think about
approaching that in some reasonable, least invasive manner.

Thanks for looking into it!

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