KSZ9031 phy not working on linux 3.10.17

philipperey · ‎06-14-2016

Hi everyone,

At our work company, we recently made the design of a new board using a KSZ9031 for ethernet connection.

It is working OK in 10/100 mbits mode : I can ping an other host without any issue.

The problem appears when trying gigabit connection : the interface goes up and then down a few seconds later, like a yoyo.

I tried using the mi-tool utility to dump phy registers, but I'm getting an error : SIOCGMIIPHY on 'eth0' failed: No such device.

So the question is : what could be the issue if phy is working in 100mbits but not gigabit ?

We are using a kernel 3.10.17 and I implemented the device tree to support the phy.

I have no experience debugging ethernet phy hardware issues so any help / hint is appreciated.

Thx,

Phil

igorpadykov · ‎06-14-2016

Hi Phil

one can look at drivers on

for RGMII one may need to adjust skew according to i.MX6 RGMII

datasheet requirements, KSZ9031 has skew pad registers

which may be used for tweaking timings.

Best regards

igor

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