Ethernet Compliance Test

Technical Support
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1

Hello,
we are using iMx7 Colibri Module with LAN9512 on our Carrier Board for a sencond ethernet interface.
I wan’t to execute an ethernet compliance test with our LeCroy test suite. I’ve read this article Ethernet Compliance Testing bei Toradex and have a list of the register values that will set the KSZ8041NL and the LAN9512 into test mode.
https://ww1.microchip.com/downloads/en/Appnotes/AN2686-Ethernet-Compliance-Test-10BASET-100BASETX-1000BASET.pdf
How can I write these values into those PHY registers from my serial interface(SSH) on my Ubuntu PC?

Many thanks in advance!

2

Hi @Roger-G.O.A.T. !

Sorry for the delay.

You can use the mii-tool from this net-tools repository.

Best regards.

3

Just a clarification: SSH connection with the module is done over ethernet and serial connection is done over a serial interface (UART). They are different types of connections :slight_smile:

4

Sorry, I got that wrong. The board is connected via UART.

5

Hi, can you give me an example how to configure the LAN9512 for 100BaseT tests with mii-tool?

2848-2021-07-15-07-11-41-clipboard.png
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Many thanks in advance!

6

I tried miitool GitHub - kontron/miitool: Handy tool to manipulate PHY registers. in the meanwhile and executed the following command in the serial console.

miitool w eth0 00 0x2100
miitool w eth0 1F 0xA000

After executing those commands I could not observe that the KSZ8041 PHY on the colibri is sending any scrambled idles. I received these messages from the colibri.

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7

Out of the top of my head (and with a little Wikipedia help :p), after disabling the Auto-MDIX you would get scrambled messages if the ethernet connection is done with another device that is MDI.

So, supposing that I’m right, I have some questions:

  • Are you connecting the module directly to some MDI device, so the messages would be scrambled?
  • If you’re connecting directly to your computer (which should be MDI, or even MDI/MDI-X), did you also disabled the Auto-MDIX on your computer’s NIC?

On the other hand, if I’m understanding the problem/use-case wrong, can you explain it better?
And also show how you’re doing your connections?

8

Hi, we want to do ethernet compliance testing with our carrier board design. We’ve got the two follwoing ethernet interfaces:

  1. eth0 - Colibri iMX7 on board PHY KSZ8041NL

  2. eth1 - LAN9512 ETH/USB Hub on carrier board

We have the LeCroy QualiPHY test setup in our lab. https://teledynelecroy.com/options/productseries.aspx?mseries=252&groupid=140 The RJ45 ports of the Carrier Board will be connected to this passive measurement board. See picture attached.
The steps of testing are described by LeCroy and Microchip. https://ww1.microchip.com/downloads/en/Appnotes/AN2686-Ethernet-Compliance-Test-10BASET-100BASETX-1000BASET.pdf
But I need to find a wait to set the PHYs in the appropriate test state.
At the moment it doesn’t work and no waveforms are displayed on the scope.

BR achim
enet_tf-enet-b_lg

9

Hi, @Roger-G.O.A.T

Maybe you can also try with another tool: the ethtool

Best regards

10

May you connect me with Andrija Stojkovic, the author of Ethernet Compliance Testing bei Toradex . He did exactly what I’m trying to do. He should know exactly what has to be done

11

Hi @Roger-G.O.A.T

Andrija is not currently working at Toradex.

Can you inform if you are using Reference Image (Minimal or Multimedia) or TorizonCore and the exact version?

Best regards,