[Bug 1961871] Re: 20.04.4 candidate image doesn't work with some usb/eth on pi-zero-2

[Juerg Haefliger]

dwc2 is the default for arm64. dtoverlay=dwc2,dr_mode=host is not
necessary for pi0. Hrm. That line is actually in the [cm4] section. Are
you sure it was loaded?

The daily focal arm64 image from today (20220223) boots fine for me. I
also have an r8152 USB NIC attached.

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Title:
  20.04.4 candidate image doesn't work with some usb/eth on pi-zero-2

Status in u-boot package in Ubuntu:
  New

Bug description:
  The devices I have at home all seem to work fine, but I noticed on the pi-zero-2 we have in the lab that it was working fine with the armhf candidate image from 20220221 but not with arm64. I was eventually able to get serial console on it and discovered that the device had booted, but failed to detect the network adapter, which in this case is using the r8152 driver and is part of a usb hub.
  It's weird that it worked fine on the armhf image but not arm64, so I looked a bit more and found that the arm64 image contained both of these lines in config.txt:
    dtoverlay=dwc2
    dtoverlay=dwc2,dr_mode=host
  On armhf, only the second line existed. I commented out the first line with 'dtoverlay=dwc2' and rebooted, then it was able to detect the ethernet-usb dongle and load the drivers for it.

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