Ethernet link problems with Micrel KSZ8041

Technical Support
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1

Hello community/tx,

after applying the mircel ethernet patch on my boards i experience ethernet link problems. I cannot proof it is related to the patch but it started happening back then.

With serial connection i can see:

  • the interface has no link with ethtool eth0
  • the Link LED on the Viola RJ45 is showing a link
  • the interface transfered data already
  • there are no messages in dmesg or syslog
  • cat /proc/interrupts eth interrupt counter stands still
  • rebooting or reconnecting the corresponding ethernet device wont help
  • soft- and hard-rebooting the imx6 resolves the problem temporarily for hours to weeks

I havent found anything related to this in the kernel repository.

What could be my next steps?

2

What exact hardware and software versions of things are you talking about?

3

Pardon, i am using a Colibri iMX6DL 512MB V1.1A on a Viola Plus with the Toradex 2.7 Images build.

4

Hi

Thanks for the Information.

after applying the mircel ethernet patch on my boards i experience ethernet link problems

You wrote that in past the link problems were solved. Is this happening on lot of modules or only some modules? Is the Ethernet link problem is still there without the patch?

Did you already contacted the supplier of the PHY for this Problem?

Best regards,
Jaski

5

The patch did resolve the previous problem where the Mircel could only transmit packets but not receive any.
Now i have the problem that the OS says there is no link and the module can not send any packets.

I did not contact the supplier of the phy because i cant proof it is suppliers fault.

6

Hi,

We haven’t heard of this issue before. I also checked if any of the patches for this driver would apply to your problems but could also not find anything.

For us at the moment really important to know is, if you have seen this problem on only one module or if that is a general problem that happens on all modules? If it is only one module an RMA return would make sense.
Otherwise, I would be interested in reproducing this error here, for that I’d need more information.

What I do not understand from your original post:

rebooting or reconnecting the corresponding ethernet device wont help
soft- and hard-rebooting the imx6 resolves the problem temporarily for hours to weeks

What exactly do you mean with the terms “rebooting, reconnecting, soft- and hard-rebooting” ?

I assume you mean:

  • turn power off and on works.
  • reboot works
  • ip link set eth0 down && ip link set eth0 up does not work

is that correct?