Has anyone got mesa llvmpipe with neon acceleration working on BBB? When running kmscube with llvmpipe driver the whole system freeze. The only way to recover is a hard reset.
If I disable neon instructions everything works. If I patch tilcdc driver to use non-coherent (= cached) framebuffer everything works.
This thread suggests it is a power rail problem:
Looking at the forum link and note about 800Mhz, as a quick test, if you force the cpu governor to hold at 800Mhz vs performance (1Ghz) do you see any change?
Regards,
I can see a slight improvement when lowering the clock speed down to 800Mhz. Perhaps 5-10 frames. Lowering to 300MHz gives me a few 100 frames.
Adding additional 47uF capacitors on the vdd_core and vdd_mpu rails does nothing to improve.