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dm816x ethernet not ping

Dear all,

  My board is dm816x Evm.It boot from sd card.The programe is provied by ti.

  Now,it is at boot mode.I cannot ping my pc machine.

 Err msg:

 using DaVinci EMAC device

WARN:emac_send_packet:No link

pingfailed 11.36.221.12 is not alive.

when i ping board,the net is link down,and then link up.

 Thanks