The primary CPLD image is: sgpio_if/default.xsvf

This is a binary file built from HDL source in sgpio_if.  You do not need
Xilinx tools unless you want to make your own modifications.

To update the CPLD, first update the firmware, libhackrf, and hackrf-tools.
Then:

$ hackrf_cpldjtag -x sgpio_if/default.xsvf
