Arduino MBED RP2040 udev rules are insufficient for SparkFun RP2350 board

I'm testing a SparkFun Pro Micro RP2350 board on Fedora Linux 40. The install sequence is as follows:

Install Arduino CLI.
Install the old Arduino MBED RP2040 core: arduino-cli core install arduino:mbed_rp2040. This says

    You might need to configure permissions for uploading.
    To do so, run the following command from the terminal:
    sudo "/var/home/znmeb/.arduino15/packages/arduino/hardware/mbed_rp2040/4.1.5/post_install.sh"

Do the post-install. This creates the udev rule file

    ❯ more /etc/udev/rules.d/60-arduino-mbed.rules

    # Arduino Mbed bootloader mode udev rules

    SUBSYSTEMS=="usb", ATTRS{idVendor}=="2e8a", MODE:="0666"
    SUBSYSTEMS=="usb", ATTRS{idVendor}=="2341", MODE:="0666"
    SUBSYSTEMS=="usb", ATTRS{idVendor}=="1fc9", MODE:="0666"
    SUBSYSTEMS=="usb", ATTRS{idVendor}=="0525", MODE:="0666"

Put the board in BOOTSEL mode and run the PSRAMTest test sketch:

    ❯ source ./sparkfun_promicrorp2350.fqbn
    FQBN: rp2040:rp2040:sparkfun_promicrorp2350
    ❯ ./PSRAMTest.sh 2>&1 | tee PSRAMTest.log
    Compiling
    Sketch uses 57908 bytes (0%) of program storage space. Maximum is 16769024 bytes.
    Global variables use 141924 bytes (27%) of dynamic memory, leaving 382364 bytes for local variables. Maximum is 524288 bytes.

    Used platform Version Path
    rp2040:rp2040 4.0.1   /var/home/znmeb/.arduino15/packages/rp2040/hardware/rp2040/4.0.1

    USB and TTY status before upload
    Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
    Bus 001 Device 003: ID 0408:a061 Quanta Computer, Inc. HD User Facing
    Bus 001 Device 005: ID 8087:0026 Intel Corp. AX201 Bluetooth
    Bus 001 Device 015: ID 05e3:0610 Genesys Logic, Inc. Hub
    Bus 001 Device 024: ID 2e8a:000f Raspberry Pi RP2350 Boot
    Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
    Bus 002 Device 002: ID 05e3:0626 Genesys Logic, Inc. Hub

    ls: cannot access '/dev/ttyACM0': No such file or directory

    Capturing begin time for 'journalctl' filtering
    Sleeping 15 seconds for devices to settle
    Uploading
    Resetting /dev/ttyACM0
    Converting to uf2, output size: 130048, start address: 0x2000
    Scanning for RP2040 devices
    Flashing /run/media/znmeb/RP2350 (RP2350)
    Wrote 130048 bytes to /run/media/znmeb/RP2350/NEW.UF2
    Flashing /media/znmeb/RP2350 (RP2350)
    Wrote 130048 bytes to /media/znmeb/RP2350/NEW.UF2
    Flashing /var/run/media/znmeb/RP2350 (RP2350)
    Wrote 130048 bytes to /var/run/media/znmeb/RP2350/NEW.UF2
    New upload port: /dev/ttyACM0 (serial)

    Sleeping 15 seconds for devices to settle
    Capturing end time for 'journalctl' filtering

    USB and TTY status after upload
    Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
    Bus 001 Device 003: ID 0408:a061 Quanta Computer, Inc. HD User Facing
    Bus 001 Device 005: ID 8087:0026 Intel Corp. AX201 Bluetooth
    Bus 001 Device 015: ID 05e3:0610 Genesys Logic, Inc. Hub
    Bus 001 Device 025: ID 1b4f:0026 SparkFun ProMicro RP2350
    Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
    Bus 002 Device 002: ID 05e3:0626 Genesys Logic, Inc. Hub

    crw-rw----. 1 root dialout 166, 0 Sep  9 17:45 /dev/ttyACM0 <-- owner and dialout group can use port, "world" can not!!!

    Monitoring
    Port monitor error: command 'open' failed: Permission denied

What has happened is that the upload process and restart changed the vendor:product of the board from 2e8a:000f to 1b4f:0026. There's no udev rule for that in the Arduino MBED rules, and arduino-cli monitor needs /dev/ttyACM0 to be world-writable, which causes the "Permission denied". Adding the rule

SUBSYSTEMS=="usb", ATTRS{idVendor}=="1b4f", MODE:="0666"

fixes it.

Is it possible for Arduino-Pico to include an option to install udev rules so I can do away with the MBED RP2040 install entirely? At this point I'm only using it to get the udev rules.

earlephilhower / arduino-pico

Arduino MBED RP2040 udev rules are insufficient for SparkFun RP2350 board #2438