DP83867IR: phy can link up but can't transmit data

Hi team：

        My design platform is AM3352, it connect to PC through the 1000M Ethernet, using DP83867(refer to phy as below)  as the 1000M Ethernet PHY.

        In the Uboot stage, when the platform wants to get data from PC using tftp protocol command, it print through the RS232 interface "link up on port 0, speed 1000, full duplex". But when loading data, it only print a "*" signal and "ARP Retry count exceeded; starting again".

        The phy txclk is 25MHz all time, and rxclk is 2.5MHz only at the start time. As the mdc/mdio interface can run well, we can read and write the phy register.

        All the phy register that can be read is listed as below. Please get some infomation for the problem.

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