J721S2XSOMXEVM: J721S2: TDA4VE-Q1: Mapping of Eth Config in enet_loopback example to GESI Ports

Tool/software:

Hi,

I am wondering how the GESI Eth Ports are mapped to the example Eth Application Configuration; for example the loopback example has the following static config,
*enetType = ENET_CPSW_2G;
*instId = 1U;
*boardId = ENETBOARD_GESI_ID;
*expPort = ENETBOARD_EXP_PORT_GESI;
*macPort = ENET_MAC_PORT_1;
*macMode = RGMII;

There are five Eth Ports on GESI Board, J23(1), J21(2), J20(2); how do I know which port on the GESI board does this refer to?

Thanks in advance.

Best,
Moses