i.MX Processors中的主题 Auto-negotiation not complete in 1 Gigabit Ethernet in KSZ9031

Auto-negotiation not complete in 1 Gigabit Ethernet in KSZ9031

anjalikkrishna — Fri, 27 Oct 2017 12:23:05 GMT

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 ?

Re: Auto-negotiation not complete in 1 Gigabit Ethernet in KSZ9031

igorpadykov — Fri, 27 Oct 2017 23:28:14 GMT

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
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

Re: Auto-negotiation not complete in 1 Gigabit Ethernet in KSZ9031

anjalikkrishna — Fri, 12 Jan 2018 07:35:34 GMT

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.

Re: Auto-negotiation not complete in 1 Gigabit Ethernet in KSZ9031

EngErfan — Tue, 02 Dec 2025 15:53:14 GMT

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?