Thank you.
I have got the imx708 module loading, but I am still getting no camera detected.
I am a bit confused about some of the instructions on this page:
https://archlinuxarm.org/wiki/Raspberry_PiI realise that this is really aimed at the Pi 3.
If I put these options in my config, the pi won't boot.
$this->bbcode_second_pass_code('', 'start_file=start_x.elf fixup_file=fixup_x.dat')