The issue was 10x worse when connecting two such ports to each other, then no stable link could be established at all. Go to Support forums. Replacing it by a regular crystal based oscillator fixed the issue. Apr 20, 1: We are facing the same issue with our micrel KSZ phy going up then down immediately in gigabit mode. A little more insight into this: Ethernet driver is generic and doesn’t depend on PHY.

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Before digging into this problem, I would like to know if you already found the root cause of the issue?? I am seeing this kssz9021rl as well, but it appears that it does not occur in older versions of the kernel. We have verified the assymetric pause is not enabled in the micrel driver.

Linux source code: drivers/net/phy/micrel.c (v) – Bootlin

One problem we have is that while the driver works kzz9021rl we have network connectivity under Linux, we randomly get “link down” and “link up” messages ks9z021rl Linux. All postings and use of the content on this site are subject to the Terms of Use of the site; third parties using this content agree to abide by any limitations or guidelines and to comply with the Terms of Use of this site.


I am still searching for a solution. The newly created question will be automatically linked to this question.

I suspect the root issue is: A little more insight into this: Sometimes the loss of links come fairly closely spaced together in time. We will try alternative oscillators. What was the final problem analysis and solution on this issue? All content and materials on this site are provided “as is”.

Phy GigaEthernet to replace AR8031 with KSZ9021 (micrel)

In reply to Keldy: Apr 16, 3: Due to the holidays, responses may be delayed. Apr 19, Ask a related question Ask a new question. Hope this helps others.

Apr 25, 3: It looks like there is some electric problem on your board eg. Apr 25, 6: Why this will happen?

If the CPU holds off for 50ms or so, then the lniux is stable and fine. I thought removing the ptp-enet-clock parameter had fixed my problem, but it came back.


The issue was 10x worse when connecting two ksz921rl ports to each other, then no stable link could be established at all. Could you please share the petalinux version you used and device-tree modifications you made? Has this issue been resolved?

KSZ – Interface and Networking – Ethernet PHYs – Interface and Networking

We are having the same problem in GigE mode. Ask a related question What is a related question?

Trademarks Privacy Policy Terms of Use. Apr 20, 1: Do you have another question? Other times we can go 20 minutes or more without loosing link.

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