There has finally been a breakthrough — Thanks to the dedicated community that has sprung up around this topic, a set of kernel patches manage to work around the hardware issues. It’s now possible to run a Radeon HD 5000/6000/7000 card on the Raspberry Pi 4 Compute Module. There are still glitches, and the Kernel patches to make this work will likely never land upstream. That said, It’s possible to run a desktop environment on the Radeon GPU on a Pi, and even a few simple benchmarks.
The results… aren’t particularly inspiring, but that wasn’t really ever the point.
See https://hackaday.com/2022/04/28/a-real-gpu-on-the-raspberry-pi-barely/
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