@Juerg,

Is it correct that all that is required to make v3d driver work on armhf
pi3+b is to modify the /boot/firmware/usercfg.txt to include:

dtoverlay=vc4-kms-v3d,cma-64,cma-128

@Jon,

Note that the pi-gadget default uses fkms, not kms. For example the 18 armhf:
https://github.com/snapcore/pi-gadget/blob/18-arm64/configs/core/config.txt.armhf#L19
 

Which works. If one wants to use vc4-kms-v3d, then that's a
modification, and it works if you modify it correctly as shown above.

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https://bugs.launchpad.net/bugs/1889223

Title:
  vc4-kms-v3d boot failure focal armhf preinstalled server

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