I apologize if this has been asked before, but I didn't seem to find this question.

On the MIMXRT1170-EVK evaluation board, there is a 1G Ethernet port (J4), on the same side as a 10/100 Ethernet port (J3).

I was able to compile/build and run the dumb_http_server example successfully.  I looked at the various dts, dtsi files and did find references the enet node.  However, I haven't found any references to enable the 1G Ethernet port.
I also noticed that pinmux.c for the zephyrproject/zephyr/boards/arm/mimxrt1170_evk has pin mapping setup for the 10/100 Ethernet port, but not the 1G Ethernet port.

I'm new to devicetrees, pin mapping and Zephyr.  What are the steps to get the 1G Ethernet port to work for the dumb_http_server example?

Or is there another example that will work for 1G Ethernet on the eval board?

Thank you very much for your help.