Hola,
I have had opengl working on the ARM64 image historically, but this ceased to be the case as of the end of last year.
I am now seeing:
[ 0.000000] cma: Failed to reserve 512 MiB
at boot, and have not yet established what is causing this to happen. Qt needs 256M in order to run the kind of pixmap dense applications I want to run on the device, and I exhaust graphical memory pretty damn quickly without being able to get a large CMA swath