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Link is Up But Can not Ping

Hi all,

In our custom DM6446 based board, I am trying to ping an end point with the use of PHY Cortina LXT972C-A4.

I have tried u-boot 1.2.0 and u-boot 1.3.4 which have different emac drivers but the result is the same.

In u-boot console, I setenv the "ipaddr", "ethaddr", "netmask" and then "ping 192.168.xxx.xxx". While pinging , I can access PHY registers, dump them and see that the Status Register #2 is 0x4780 (100Base-TX,  Link is up, FullDuplex,  PHY is in auto-negotiation mode, Auto-negotiation is completed)

Although the Link is ACTIVE, ping is failed. What may be the reason for this problem? 

Ferhat