No SPI bus in radax-cms-io image

Hi All,

I’m using a rock compute on a CM3 board and the Ubuntu Server 20.04 image.
but I cannot access the SPI bus ?

When looking in dev directory I see no SPI bus, gpio and i2c is there.

When do I need to do to enable the SPI bus ?

also there is no boot/uEnv.txt file to add any overlays?

Any help would be great!.