Jihua Cheng writes:
Jihua> Yuli, Thanks very much for your instruction. It seems I move Jihua> further, however I still do not make Ethernet port2 works Jihua> fine. Following is the my modification and the symptom.
Jihua> 1) I changed the BCSRs bit FETHIEN2 to 0, reset the Ethernet Jihua> Port2 (Phy addr 3) to enable auto-negatiation. Now, the Jihua> MII reg0 = 0x3100, reg1=0x782D. IP Addr 172.18.100.54 Jihua> does exist. when I enable FCC2 and ping 172.18.100.54, Jihua> ping success. When I "ping 172.18.100.54", the message Jihua> "fex: tx error" is gone. It seems TX is fine. Is it Jihua> correct?
Probably it is. Try a sniffer (ethereal, tcpdump) on the host to see if anything is transmitted by the board.
Jihua> 2) However, "ping 172.18.100.54" fail. the message "ping Jihua> failed; host 172.18.100.54" is not alive. FCC3 Rx Clock Jihua> is set to CLK15. PortB4~17, PortC16~17 are enabled.
Why do you think that the problem is still at the hardware level? What are the board's IP address, MAC address, subnet mask, etc. (just type printenv). You write that 172.18.100.54 exists but you don't write anything about the host to which this address belongs. Is it a Linux machine? Does it respond to pings at all? What's about subnets? There are too many possible reasons for ping failure.
[...code deleted...]