we use c6474 evm board to develop our project.but i found that when i tried to boot c6474 through emac,it seemed that no ether_ready_frame was recived,i try to send my bootimage to c6474, but it didn'r work.the bootimage is created according to bootloader user guide,and sw4 and sw5 is set too,bootmode is emac master and set override off.can somebody show me where the problem may be?