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Ethernet 10Mbps Cannot ping
Added by iseori kang about 1 month ago
100/1000Mbps work well.
But, 10Mbps is only LINK and ping does not work. (both fixed 10M and auto-negotiation)
Please review the below, attached and let us know of opinions.
- Version
- OS: Debian GNU/Linux 12 (bookworm) aarch64
- Host: Critical Link MitySOM-AM62x
- Kernel: 5.10.168-01697-g501ba3235e01-dirty
- H/W : 6252-TX-X8D-RI 24-02-08 (kingston)
- PHY : DP83867IR
Replies (2)
RE: Ethernet 10Mbps Cannot ping - Added by Jonathan Cormier about 1 month ago
Hi Iseori,
I tested a 10Mbps link using our devkit and the KSZ9131RNXI PHY and had no issues. The PHY linked and I was able to send network traffic without issue. We have not used the DP83867IR phy in any design.
TIs e2e has quite a few customers asking questions about it and they have a published troubleshooting guide. https://www.ti.com/lit/an/snla246c/snla246c.pdf
If you would like us to do a schematic review you can send it via email however considering it works at faster speeds I'm not sure what could be wrong.
RE: Ethernet 10Mbps Cannot ping - Added by Jonathan Cormier about 1 month ago
Hi Iseori,
I double-checked your schematic's phy and magnetics parts, and nothing looked wrong.
Note that the magnetics symbols J7/J8 are not correct. However, I looked up the lpjg16414aenl part directly, and it's actual symbol looks correct so no issue there.
But, 10Mbps is only LINK and ping does not work. (both fixed 10M and auto-negotiation)
The fact that the phy links at 10Mbps points us away from the magnetics anyways.
Are there any diagnostic steps that you've tried already? Have you created an e2e post with TI? We could try to boost it through our TI rep.
