RPi PoE+ Hat Fan overlay

Apologies for what might be a basic question, but is the dtoverlays mechanism used in config.txt supported by RISC OS on Pi?

I have a RPi3B+ with a PoE+ Hat, but adding dtoverlays=rpi-poe-plus to the config.txt does not seem to activate the fan on the hat. Is this overlay included with RISC OS? Does anyone know how I could look to porting this over if not?

I believe that there is also an i2c option for this overlay, so perhaps there is/could be an app in RISC OS that could take this task on, but presumably not without the overlay in the first place?

It would be great to use RISC OS again after 30 years, but without the fan working on the hat, my little Pi will cook itself!

Apologies for what might be a basic question, but is the dtoverlays mechanism used in config.txt supported by RISC OS on Pi?

No

Welcome to the forum :-)

I take it you’ve got one of these.

I had a quick look but didn’t find any specification for talking to it using I2C. Maybe it’s a case of looking at the source for the Raspberry Pi OS driver to find out what the I2C address and registers are?