OSError: [Errno 22] Invalid argument: '/dev/piControl0'

[davigar15]

BalenaOS versions >=6.3.18 give the following issue with the revpi-connect-4's digital input

OSError: [Errno 22] Invalid argument: '/dev/piControl0'

Balena OS 6.1.24 worked good.

[mpous]

@davigar15 could you please share the dmesg to learn more about the issue? Thanks!

[floion]

Also, can you share details on how you are testing the DIO module?

[davigar15]

Sorry for the delay:

@davigar15 could you please share the dmesg to learn more about the issue? Thanks!

This is the dmesg output related to piControl0

[    8.588291] piControl: loading out-of-tree module taints kernel.
[    8.591457] piControl: built: Mon May 26 03:48:05 PM UTC 2025
[    8.591480] piControl: RevPi Core
[    8.591484] piControl: MAJOR-No.  : 239
[    8.591759] piControl: MAJOR-No.  : 239  MINOR-No.  : 0
[    8.591927] piControl: error: cannot open file /mnt/boot/config.rsc
[    8.591974] piControl: error: cannot open file /opt/KUNBUS/config.rsc
[    8.592182] piControl: piControlInit done
[  197.556182] piControl: problem at driver initialization
[  197.556197] piControl: no piControl reset possible, a firmware update is running
[ 1155.548180] piControl: problem at driver initialization
[ 1155.548195] piControl: no piControl reset possible, a firmware update is running

This is the usage, where it fails:

import revpimodio2
CONFIG = "/etc/revpi/config.rsc"
revpimodio2.RevPiModIO(autorefresh=True, configrsc=CONFIG, procimg=None)

This code runs in a container, which has the /etc/revpi/config.rsc file in the correct path.

I just tested it with the latest recommended version of Balena OS: balenaOS 6.5.24+rev3

Additional note: /mnt/boot/config.rsc file does not exist in the host, but /mnt/boot/config.json does.

[davigar15]

@mpous @floion any updates?

[rhampt]

@davigar15 Quick update. We've decided internally to allocate time towards fixing this problem. We'll be in touch when we have a resolution in place. Thanks!

[That-Guy-Jack]

Just Following on with this from what i've found and gotten from the rev-pi forum, adding a DTOverlay and making the config.rsc on the /mnt/boot/ folder has gotten the LEDs working on my setup,

See the forum post here https://revolutionpi.com/forum/viewtopic.php?t=4722

my device config DT Overlays looks like this

"vc4-kms-v3d,cma-320","dwc2,dr_mode=host,ant2","revpi-connect4"

This seems to work for me on balenaOS 6.5.24+rev3

On balenaOS 6.5.40 i've got a issue thats unrelated with USB power being disabled but, it might be related in some way.