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


From: Dawid Buchwald
Subject: [bug #61624] [Feature request] Serial/UART UPDI programmers
Date: Mon, 13 Dec 2021 05:01:35 -0500 (EST)
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.93 Safari/537.36

Follow-up Comment #11, bug #61624 (project avrdude):

Hey, I'm glad to hear that at least flash programming works correctly now. I
assume that once uploaded, programs work as expected? Could you confirm this?

As for the atmega4808 failure during fuse setting, there are actually two
problems there: the more obvious one is segmentation fault, which probably is
just some invalid printf. It will take a while to find, but it's not a biggie.
What bothers me more is the fact that fuse is being written with value 0x54,
but read back with value 0x00:

avrdude: ST to 0x001281
avrdude: Sending 4 bytes [0x55, 0x44, 0x81, 0x12]
avrdude: Received 1 bytes [0x40]
avrdude: Sending 1 bytes [ *0x54* ]
avrdude: Received 1 bytes [0x40]
Writing | ################################################## | 100% 0.01s
avrdude: 1 bytes of fuse1 written
avrdude: verifying fuse1 memory against 0x54:
avrdude: load data fuse1 data from input file 0x54:
avrdude: input file 0x54 contains 1 bytes
avrdude: reading on-chip fuse1 data:
Reading |                                                    | 0% 0.00s
avrdude: LD from 0x001281
avrdude: Sending 4 bytes [0x55, 0x04, 0x81, 0x12]
avrdude: Received 1 bytes [ *0x00* ]

Unfortunately I don't think I can fix that without having the actual chip on
my desk, and I'm currently waiting for one to arrive in couple of days.

In the meantime I will try to replicate the scenario somehow using the
hardware I have on hand.

Once again, thanks a lot for all your effort!

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