Reply To: Problem with Pi3B and Bullseye

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#17263
Mark Williams
Keymaster

FYI, this is what I get on a Pi Zero i just tested. Doesn't look different
[ 2.963607] 3f215040.serial: ttyS0 at MMIO 0x3f215040 (irq = 86, base_baud = 50000000) is a 16550

pi@raspberrypi:~ $  stty -F /dev/serial0
speed 9600 baud; line = 0;
-brkint -imaxbel

Try the stty command with -a stty -F /dev/serial0 -a so you get all values, and see if this is the same between your Pis.
The Rpi2 looks like it is working
$GNTXT,01,01,01,NMEA unknown msg*46
The above message is the GPS telling you that it is seeing data sent from the Pi to the GPS it and doesn't understand them. The Pi is most likely echoing back NMEA sentences.. or the console is still enabled on the serial. You can disable echo using stty -F /dev/ttyAMA0 -echo

Mark --OzzMaker.com --

Blip, blop, bloop...