Hi Jack,
I.MX8M doesn't support local bus, BUT support PCIe interface. So you can select FPGA with PCIe interface.
Actually, this kind of interface is not called local bus on iMX processors,but WEIM, which is supported by i.MX6QP, I.MX6Q, I.MX6D, IMX6DL , I.MX6S , i.MX6UL.
Hope above information is helpful for you!
Have a nice day!
B.R,
Weidong