TMDSIDK437X: Software modifications when changing PRU Ethernet PHY

Hi,

I have written an application with PRUICSS-based ethernet at idkam437x with ccs 6.1.2 and sdk 2.1.1.2. Everything was doing great - an external application could have been connected to the idkam437x and the data was sent without big problems.

Now, we use a custom board with am4377 processor with ethernet programmed at the same PRUICSS and the same PRU unit and nothing could be replicated - even the ping test fails. There looks to be no big differences between this processor and the one used in idkam437x concerning the ICSS - I suspect the problem lies in different PHY used at the custom board. 

Could you please tell me if I have to change something ( and where to change it ) in the registers or sdk source codes when different Ethernet PHY unit is used?

Thank you,

JJ