Stuart,
fmc30rf_ctrl_probefmc() expect the GPIO switch to be set properly (GPIO_DIP_SW0 to "0" on SW12) on both ZC702/ZC706, check 4FM Getting Started Guide. That should work fine.
I have the feeling to repeat myself again, but please refer to the reference design; The FMC30RF is too complex to document everything, you will need to understand the reference design, modify the reference design as any of our customer did using the same material. There is also information on a sticky topic in the FMC30RF forum.
If you are not able to do so, we can offer you an engineering support contract, where we will help you and answer all your direct questions. If this is a path you are interested to take, I can get a sales engineer to discuss that further with you.
Best Regards,
Arnaud
[/size][size=78%] [/size]