AnsweredAssumed Answered

imx6q GPU issues

Question asked by Ivan Kozic on Nov 20, 2013
Latest reply on Oct 5, 2018 by thomaslinder

Hi all,


I have an issue every time I try to run GPU. My system is iWave Q7 i.mx6 quad, bsp is based on 4.0.0 from freescale. Basically, I always have the same issue - output image on the HDMI is black/white striped instead of being coloured, with a lot of artefacts. Sometimes it doesn't even start, just makes kernel panic with dumping the stack, starting with the following message:


kernel BUG at arch/arm/mm/dma-mapping.c:478!
Unable to handle kernel NULL pointer dereference at virtual address 00000000


I can observe this with running OpenGL ES 1.1 examples from GPU SDK and also with Qt 4.8 examples (which uses OpenGL ES 2.0). DMA is doing something wrong here and I am not really sure what.


I will post an image of these artefacts a bit later today.


Does anyone have similar issues? How can this be resolved?