OpenCL support for Mali-T628 MP6 on Arndale Octa?

Summary

Is OpenCL support for the Mali-T628 (for example as found in the Exynos 5420 SoC on the Arndale Octa board) available? If so, how to set it up?

More details

According to the vendor, OpenCL should be supported, but the Arndale Octa Wiki does not state how this can be achieved.

I am using the latest Linaro developer build and installed Mali drivers that contain OpenCL libraries for Mali T604. According to this guide, the driver actually contains references to the Mali T628. So I tried to create the udev rule as specified, which is supposed to solve a permission problem with /dev/mali0, but I found that there is no /dev/mali0 on my installation at all. So my conclusion is that the driver indeed does not support T628.

When I execute a clinfo utility, clGetDeviceInfo returns CL_OUT_OF_HOST_MEMORY for some device properties. Why can I query the GPU for some characteristics, but does this fail for some others? When running a normal application, the same error appears when trying to create an OpenCL Context.

I was surprised to find this topic, where yoshi seems to have OpenCL working and can run benchmarks on his Arndale Octa board. How is this possible if there is no driver available? Or am I just missing something? I hope that you can help me to also establish a working OpenCL development environment.

Parents
  • Hi bramv,

    The Mali-T628 GPU supports OpenCL, absolutely, and we support this in the drivers for that GPU which we ship to our silicon customers when they licence the GPU design. The userspace drivers that you have downloaded from malideveloper.arm.com require a kernel driver integration in order to work.

    If /dev/mali0 does not exist on your platform then the mali kernel driver that exposes this device has not been integrated with the kernel you are using. I believe Linaro kernels do not currently support Mali so this is expected to not be available on those kernels. You either need to integrate the kernel module with the Linaro kernel, lobby Linaro to support Mali in their kernel (would be a long term solution, don't know why they don't do this currently), or use the Insignal kernel which should support it. Yoshi is almost certainly not using a Linaro kernel, and is using one probably from Insignal which has the mali kernel module integrated.

    Hope this helps,

    Chris

Reply
  • Hi bramv,

    The Mali-T628 GPU supports OpenCL, absolutely, and we support this in the drivers for that GPU which we ship to our silicon customers when they licence the GPU design. The userspace drivers that you have downloaded from malideveloper.arm.com require a kernel driver integration in order to work.

    If /dev/mali0 does not exist on your platform then the mali kernel driver that exposes this device has not been integrated with the kernel you are using. I believe Linaro kernels do not currently support Mali so this is expected to not be available on those kernels. You either need to integrate the kernel module with the Linaro kernel, lobby Linaro to support Mali in their kernel (would be a long term solution, don't know why they don't do this currently), or use the Insignal kernel which should support it. Yoshi is almost certainly not using a Linaro kernel, and is using one probably from Insignal which has the mali kernel module integrated.

    Hope this helps,

    Chris

Children
More questions in this forum
There are no posts to show. This could be because there are no posts in this forum or due to a filter.