Reply To: Problem with Pi3B and Bullseye

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#17247
JonM
Participant

More progress... ran rpi-update to update the firmware.  This was successful, and dmesg reported

ttyS0 at MMIO 0x3f215040 (irq=86, base_baud=50000000) is a 16550

This is same base_baud that was reported by Raspian 11 when it wasn't working.  The update also updated the kernel to 5.15.33.  Since cat /dev/serial0 was working, I went ahead and installed gpsd and gpsd-clients; as expected those worked too.

I went back to Raspian 11 with 5.15.32 (lower minor number?)

ttyS0 at MMIO 0x3f215040 (irq=71, base_baud=50000000) is a 16550

AND IT WORKED!  Sorry for yelling, but this is exciting!

Tempting fate, I ran rpi-update again, and ended up with the 5.15.34 kernel...

The GPS is still working!

If I had to guess, it was the firmware update that was needed to correspond to the 5.x series kernel.

Blip, blop, bloop...