Originally Posted by knc1
My one ARMed Chatty Katie is getting a photo session of the pads around the lamp power connector today.
And a bit of probing with my $10 O'Scope (if it works, it was only $10).
Having a higher speed than 115,200 would be nice when re-writing a 4G flash drive.
But I agree with you, that is going to take some flow-control signals. If I can find them....
Writing flash images over serial is aided by the fact the YMODEM protocol checksums the packets and retries if missing or damaged bytes. u-boot also has kermit support, but yifanlu says that this is broken, so we should use YMODEM.
One time, on a tiny device, I had to suck a firmware image out over a blinking LED, because that was all that I could control. It took many days.