Terasic DE1-SoC Configure FPGA from Linux (LXDE Kernel 4.5)

Can anybody please explain how I can configure the FPGA from Linux?

Previously it was possibly to
cat fpga_image.rbf > /dev/fpga0

but this method is deprecated and I cannot find any instructions. This post is the closest to help I can find but it doesn’t give instructions:-
https://forum.rocketboards.org/t/missing-dev-fpga0-device-on-de0-nano-soc/526