Automation, sensing and robotics • RPi 5 pwm-pio errno ENOENT

RPi 5 with OpenMediaVault installed. I've add "dtoverly=pwm-pio,gpio=27" to /boot/firmware/config.txt.
After reboot dmesg | grep pwm:
pwm-pio-rp1 pwm_pio@1b: error -ENOENT: /pwm_pio@1b: could not open PIO
pwm-pio-rp1 pwm_pio@1b: probe with driver pwm-pio-rp1 failed with error -2

There is a /dev/pio0 and /sys/class/pwm/pwmchip0 only.
I expected a /sys/class/pwm/pwmchip1 also, but NO.
OMV alerts updates and I am current, but I'm not sure if that just for OMV or both OMV and RPI OS Lite Bookworm.

I do not know where to look next.

Recommendations?
Thanks, morris

Statistics: Posted by p26grinz — Mon Feb 02, 2026 7:36 pm — Replies 0 — Views 22

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