If you configured the Tx and Rx clocks wrong (Rx clk was connected to Tx and Tx clk was connected to Rx), FCC can still works, but it will lost most of the packets.

yuwp

From: "Ho Lee" flyduck@linuxkernel.net To: "u-boot-users" u-boot-users@lists.sourceforge.net Date: Fri, 4 Jun 2004 18:43:22 -0700 Subject: [U-Boot-Users] MPC8260 FCC ethernet fails.

Hi Folks,

I am porting u-boot 1.1.1 to MPC8260 based board, which uses FCC3 for ethernet. Basicially it is working; it sends and receives ICMP packets

(ping)

and DHCP packets. But when I try to download a file via TFTP protocol, it loses packets frequently (once per about 10 packet transfers), eventually results in timeout. I monitor the packet transfers by tcpdump, and the

server

surely sends a packet, but the buffer descriptor of FCC says the RX buffer is empty. What may cause this problem? I would appreciate any comments.

Regards, Ho