Utilizing 1000Base-T transceiver (RJ45 type) to down speed the port to use case is still possible, but compatible transceiver is required.
According to readme from Intel, the followings are official supported modules and highly recommened
1. Finisar 1000BASE-T SFP FCLF8522P2BTL 2. Avago 1000BASE-T ABCU-5710RZ 3. HP 1000BASE-SX SFP 453153-001
Advantech got chance to check followings, would be the list for customer a reference
Driver : ixgbe version: 5.5.3
Able to get link up*:
* Check Only to get IP from DHCP and is able to Ping out