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communication between two C6474 EVM boards by EMAC

Hi, guys! I have tested the EMAC example(CCS3.3\boards\evmc6474_v1\tests\emac) on C6474 EVM in external loopback mode, and the program works well. Now I want to complete a program which fulfill the communication between two C6474 EVM boards based on the same example. Since two C6474 EVM boards are same devices, I think a cat6 cable, wired T568A-T568B is needed, and the MAC address uesd in loopback mode(00.01.02.03.04.05) should be changed to the real MAC address from EFUSE, am I right? And are there any other place in the original program should be altered?