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DM648 NDK PING

Hi all:

      Our custom borad used DM648 + 88E1512,we only use GMAC0 and one phy.

      And the development tools we used NDK version 2.0

     We use the NSP for dm648 and created a project used NDK helloworld example.but we cant ping the IP address what we set.

     After a long time debuging,  it seems that DM648 has received the arp packet and send the reply,but my pc have not received.

    the log is below:

[C64XP_0] cpsw_MDIO_FindingState: Timed Out looking for a Phy!
[C64XP_0] cpsw_MDIO_FindingState: Timed Out looking for a Phy!
[C64XP_0] Dst MAC Address = 90-b1-1c-79-5c-1b Src MAC Address = 00-17-ea-a8-81-f4
[C64XP_0] cpsw_MDIO_FindingState: Timed Out looking for a Phy!
[C64XP_0] cpsw_MDIO_FindingState: Timed Out looking for a Phy!
[C64XP_0] Dst MAC Address = 90-b1-1c-79-5c-1b Src MAC Address = 00-17-ea-a8-81-f4
[C64XP_0] cpsw_MDIO_FindingState: Timed Out looking for a Phy!
[C64XP_0] cpsw_MDIO_FindingState: Timed Out looking for a Phy!
[C64XP_0] Dst MAC Address = 90-b1-1c-79-5c-1b Src MAC Address = 00-17-ea-a8-81-f4
[C64XP_0] cpsw_MDIO_FindingState: Timed Out looking for a Phy!
[C64XP_0] cpsw_MDIO_FindingState: Timed Out looking for a Phy!
[C64XP_0] Dst MAC Address = 90-b1-1c-79-5c-1b Src MAC Address = 00-17-ea-a8-81-f4
[C64XP_0] cpsw_MDIO_FindingState: Timed Out looking for a Phy!
[C64XP_0] cpsw_MDIO_FindingState: Timed Out looking for a Phy!

   

"[C64XP_0] Dst MAC Address = 90-b1-1c-79-5c-1b Src MAC Address = 00-17-ea-a8-81-f4" is my debug info add in csl_emac.c:EMAC_sendPacket

90-b1-1c-79-5c-1b is the mac address of my pc, 00-17-ea-a8-81-f4 is the dm648 board.

Could anyone give some clues to me? 

how to debug this problem, where the packet send to?