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Troubleshooting • rpi 4b Bookworm no /dev/ttyACM*

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I installed Bookworm onto a raspberry pi 4b, used raspi-config to enable serial port and am trying to get

Code:

arduino_cli board list
to work but it just says:

Code:

Port       Protocol Type        Board Name FQBN Core/dev/ttyS0 serial   Serial Port Unknown

Code:

ls -l /dev/dev/ttyA*
shows nothing when I plug in a Pico W via USB and nothing mounted when I plug it in in bootloader mode.

I can see the pico w with lsusb:

Code:

pi@pi:~ $ lsusbBus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hubBus 001 Device 007: ID 2e8a:0003 Raspberry Pi RP2 BootBus 001 Device 002: ID 2109:3431 VIA Labs, Inc. HubBus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
If I take out the Bookworm sdcard and plug in the ssd that has Bullseye it all works fine.

Is there something I've forgotten to do on Bookworm that I did on Bullseye years ago to get the /dev/ttyA* working?

Statistics: Posted by codebrane — Sat May 31, 2025 8:10 am



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