How does ethernet work on freescale MPC8555E embedded platform with FreeBSD system?

The main purpose of this paper is to provide the reader with some insight into how Ethernet controller works on MPC8555E embedded platform produced by Freescale company. The paper will deal with the problems connected with Ethernet performance during power-up of computer when firmware is running on the hardware and later when FreeBSD loader works. Another problem which will be described is network controller management that is provided by FreeBSD kernel. The last part will mention some differences between firmware (pooling) and kernel network implementation (interrupt).