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am335x, uboot cannot ping the board itself when set the phy into loopback mode?

quan liang
Prodigy 130 points

Hi, All:

         I  am doing a phy lookpback test  with am335x, but it cannot work .  under normal mode ,the board can ping PC successfully.   when i set the phy into  loopback mode,   try to ping the board itself ,  and   found that  the cpsw‘driver cannot get the arp packet back.   However  i  probe rx pins between am335x and the phy, and fount that it   have the signal  when  sending  ping command. The board is beaglebone-black, and  the test  is  under uboot, (u-boot-2013.01.01-psp06.00.00.00) .

       Does anyone konw something about it?  thx in advance.