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This is Arduino IDE screenshot after downloading LED Blinky sketch to F32C inside FPGA, selected generic FPGA board with 128K RAM and 100MHz Clock. After download the on-board LED on the FPGA/SoC SoM will blink.

Troubleshooting Tips

If you are not sure to what pins the LED(s) are connected it is possible to create a "dummy" FPGA design with "UNUSED PIN PULLUP" option. If FPGA is loaded with bitfile then any LED that is connected in active high configuration will be on, if the I/O Bank is powered. The internal pullup current is sufficient to make most modern LED to be lit (not very bright).

If you know that there are LED's connected to FPGA and they do not get lit with "unused pin pullup" FPGA design, then most likely the I/O Bank with the LED's has no power.