Using Ethernet in Custom Board

Should I preform any hardware initialization for using Ethernet in my S7G2 Custom Board?

For example, to use the SDRAM, we have to initialize the hardware manually in a custom board whereas it is taken care of in the bsp_init() function of a Synergy S7G2SK or S7G2DK . Similarly should I perform any function call to write the register settings to the Ethernet transreceiver while using custom board?