IO MUX MAC V on Arria10 SoC


This question may be silly but it indeed confuses me a lot.
From the user guide, I know this CPLD is used for IO MUX.
But I am quite confused how can I use it? Actually I am testing the FMC-HDMI board from terasic. I was asked to update the .sof file for IO MUX MAX V CPLD. So I really want to know about this.
Thank you in advance.