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Usb Ethernet gadget on Ultra96-v2 board not working properly on 2024.1 prebuild image

DominicT

Hello,


 I am trying to get the USB ethernet gadget working on an Ultra96-v2 board from Avnet.

After not succeeding with my own image I tried to use the 2024.1 prebuild image provided by avnet.

The gadget is configured using the provided script which does the configuration via configfs.

This seems to work, the usb0 ethernet adapter is available and I can assign an IP etc.

But on the host PC (Ubuntu) the usb device is not enumerated a first. After approx. 30 minutes it suddenly enumerates, but only using USB2.1 and not 3.0 as configured.

I then used the debugfs interface of DWC3 driver to get more information. The link_state hangs at RX.Detect while the device is not enumerating.

Has anybody else encountered that problem as well? What could be the problem?

Any help is highly appreciated - I'm hanging on that issue for a couple of weeks already...


Best Regards,

Dominic

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    This doesn’t appear to be a configfs issue. If DWC3 is sitting in RX.Detect Then it suddenly appears as USB2 after a long delay, which usually indicates that USB 3.0 link training is failing; most of the time, it’s due to PHY configuration, cable quality, or signal integrity. I’d start by checking the device tree PHY settings and swapping in a known good USB 3.0 cable and port. https://github.com/torvalds/linux Related USB hardware project on PCBWay, it will be very helpful. https://pcbway.com/project/shareproject/I_made_a_Nano_USB_HUB_daafa782.html

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  • 0

    This doesn’t appear to be a configfs issue. If DWC3 is sitting in RX.Detect Then it suddenly appears as USB2 after a long delay, which usually indicates that USB 3.0 link training is failing; most of the time, it’s due to PHY configuration, cable quality, or signal integrity. I’d start by checking the device tree PHY settings and swapping in a known good USB 3.0 cable and port. https://github.com/torvalds/linux Related USB hardware project on PCBWay, it will be very helpful. https://pcbway.com/project/shareproject/I_made_a_Nano_USB_HUB_daafa782.html

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