The difficulty with compiling the driver lies in finding the right version of the proprietary blobs to use. The one in the git repository turns out to be not the latest one, the one in OLPC RPM Dropbox is.
One thing that it immediately fixes is screen rotation (xrandr). 3D may work too, but I haven't tested that (no EGL / GLES test programs). There is no acceleration for hardware decoding though, as it is another subsystem of the SoC (VMeta) and requires complete different library ...
Anyway, with this, and the other hard work from Mavrothal, FatdogArm on XO-4 is looking very good.
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