[Bug] Boards with no PX4IO MCU play error tune on startup

[AlexKlimaj]

Describe the bug

I am getting a constant error tune playing without a PX4IO carrier board. The error tune will play until a new tune overrides it such as the home position tune.

Caused by #22243

ERROR [px4io] PX4IO Not Supported
INFO  [tune_control] Stopping playback...
ERROR [px4io] PX4IO Not Supported
PX4IO start failed

To Reproduce

Upload current main to a flight controller that doesn't include a PX4IO MCU.

Expected behavior

No error tune on boot without a PX4IO.

Screenshot / Media

No response

Flight Log

No Flight Log

Software Version

Current main

Flight controller

ARKV6X

Vehicle type

None

How are the different components wired up (including port information)

No response

Additional context

No response

[julianoes]

Which target is this? I didn't know you could have the ARKv6X without IO.

The check is based on whether the IO update file is included:

PX4-Autopilot/ROMFS/px4fmu_common/init.d/rcS

Line 278 in 0056898

if [ -f $IOFW ]

[AlexKlimaj]

Which target is this? I didn't know you could have the ARKv6X without IO.

The check is based on whether the IO update file is included:

PX4-Autopilot/ROMFS/px4fmu_common/init.d/rcS

Line 278 in 0056898

if [ -f $IOFW ]

The IO MCU is on the carrier board. You can use any of the PAB form factor flight controllers on carrier boards with or without the IO. The ARK PAB Carrier and ARK Jetson PAB Carrier don't include the IO MCU. But you can use the ARKV6X on any of the Holybro or CUAV carriers with an IO MCU.

[julianoes]

Right, so essentially the IO seems to be an option. So that means we need to make it "optional" which also means we can't raise an alarm if IO is not discovered when it should be there. We can't have both, bit messy.

[AlexKlimaj]

We could extend the ver command to specially be able to query if the IO should be started.