Problem with ethernet

[Edvin]

Hello everyone,

Sorry for any mistakes in my mail, first time using a mailing list.

I'm using a board with soc ipq4018, phy YT8531S. As MDIO driver using
generic, as ethernet driver ag71xx. Many things are ported from
openwrt, so I hope, maybe somebody can help me.
When the speed is 1000mbit, ping works, but when set to 100 or 10, stop working.
Maybe somebody had a similar problem with the YT8531S chip?

P.s. Sorry for poor English, not my native language.