Auto-negotiation not complete in 1 Gigabit Ethernet in KSZ9031

[anjalikkrishna]

Hi All,

   I am facing an weird problem in Ethernet when the speed is 1000 Mbps. When I connect my i.MX6 solo board to the  LAN port which supports 1 Gbps , the LED on the Ethernet port never blinks or glows.  As far as I investigated on this issue the link is not established so the LEDs are off. Software side wen we had a debug we were able to find out that the based on a status variable  the link is made up and down. In working case (10/100 Mbps) , the status variable is updated with the value 796D after reading the register MII_BMSR and non-working case the status value is 7949. After decoding the value we could understand that the auto-negotiation is not getting completed in 1000 Mbps.  I am not getting any clue to debug this issue forward.

Any one has faced such issue ?

[igorpadykov]

Hi Anjalik

one can check if KSZ9031 correctly programmed, check for example

[PATCH 3/3] ARM: i.MX6: add ethernet phy fixup for KSZ9031 

Ethernet PHY KSZ9031 is not working [SOLVED] 

It has RGMII Pad Skew registers which may be used for adjusted RGMII timings

provided in i.MX6 Datasheet. https://www.nxp.com/docs/en/data-sheet/IMX6SDLCEC.pdf 

Best regards
igor
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[anjalikkrishna]

Hi Igor,

    Thanks for the reply.

  Our hardware team debugged the issue. and confirmed that no provision is provided for 1 Gbps support in hardware.

[EngErfan]

Hello,

I have the same problem. when connecting to 1G, LED indicators turns off. and no link is stablished. 

it works fine with 10/100. Tried everything, No idea. ( reached out already to Microchio, no success)

I saw that you came out to a solution. Can you help me on that?