Hi Sujith,
The PRU Ethernet interfaces are connected to the PRU_ICSS (see this user guide https://github.com/beagleboard/am335x_pru_package/blob/master/am335xPruReferenceGuide.pdf). They are used for Industial Ethernet protocols, like EtherCat. For standard Ethernet under Linux the two CPSW Ethernet ports must be used (GEMAC_CPSW/MII1 and GEMAC_CPSW/MII2, plus GEMAC_CPSW/MDIO of course). The available pins and modes are listed in section 2.3.6.2 of the AM335X Datasheet, Rev. F.
