[bug #61626] jtagmkii_pdi improvements for jtag2updi use

[mcudude]

Follow-up Comment #2, bug #61626 (project avrdude):

I'm not sure I follow you regarding the documentation and what you mean by
"it", sorry. The jtag2updi project is documented on its Github repo, and the
hardware required for it to work is pretty much any AVR with at least 16k
flash I think. There are also some information scattered around in this
AVRfreaks thread:
https://www.avrfreaks.net/forum/updi-programmer-software-arduino-compatible-avrdude

The ASCII-like schematic was something I made up just to illustrate how a
programmer could be designed if DTR or RTS was controlled by Avrdude during
upload. I don't own a physical jtagicemkii (only a chinese JTAGICE stick), but
my "stick" with a CH340T USB to serial chip doesn't seem to utilize any of the
hardware handshake pins. Do you know if this is true for the actual JTAGICE
mkII as well?

Will support for increased baud rates cause any backwards compatibility issues
for the jtagicemkii_pdi protocol? 

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