DM36x EMAC: TXDx not signal if apply ping cmd in uboot prompt

Hi,

I try to verify another PHY w/ DM36x EVM. But I found TXDx not signal if apply ping cmd in uboot prompt

Meanwhile the RXD is ok. the TX CLK is OK.

I also checked througn mii cmd and the PHY registers can be accessed.

I am using the pre_build uboot binary, so I doubt that the EMAC was not initialed correctly becuase I change to another PHY.  But I failed to find why.

Could you give me some adivce?

Thanks very much!

BR,

Eason