The OPB EMAC doesn't have any feature to allow reception of packets with bad FCS (CRC). It can only count them and give a receive error interrupt. This is stated on page 51 of the data sheet for OPB EMAC version 1.04a , DS 435 dated July 26, 2006.
IMNSHO, there should have been two additional bits in the EMACcontrol register, one to cause the FCS of received packets to be stored in the receive buffer, and one to prevent received packets with bad FCS from being discarded.
