i.MX ProcessorsのトピックRe: Vivante GPU issue

Vivante GPU issue

benisandu — Mon, 31 Jul 2017 10:12:43 GMT

Hello,

First of all, I'm sorry if this is not the right place to ask, it's the first time I'm doing this. I don't expect a direct solution, but any hint or idea regarding my issue will be greatly appreciated.

I'm working on creating a BSP for a board similar to Nitrogen6 Max from Boundary Devices, based on a 4.8 Kernel. Our board has 4GB of RAM so we need CONFIG_HIGHMEM enabled in order to use all available memory. Problem is that the Galcore driver implementation does not work with HIGHMEM enabled on 4.8 kernel (and I assume on any recent kernel version).

I've been trying to debug and fix this for the past few days, with no success. Apparently, because of memory allocation changes between kernels, the driver will try to allocate and use memory from the >2GB area, and was built to only work with lowmem area.

Is there any Galcore driver implementation that takes into account usage of buffers from >2GB memory area? I saw that the Freescale Yocto BSP uses the out-of-tree kernel-module-imx-gpu-viv, but the most recent version is still built against 4.1 kernel, and I could not find anything which works with more recent kernels.

I have no previous experience with this driver and it's pretty complex and slow to debug, so as I said, any hint could help.

Thank you,

Beni

Re: Vivante GPU issue

igorpadykov — Tue, 01 Aug 2017 08:44:36 GMT

Hi Beni

for gpu debugging one can look at
IDE - Debug, Compile and Build Tools
i.MX6D/Q/DL/S/SX GPU Tools

http://www.nxp.com/products/microcontrollers-and-processors/arm-processors/i.mx-applications-processors/i.mx-6-processors/i.mx-6quad-processors-high-performance-3d-graphics-hd-video-arm-cortex-a9-core:i.MX6Q?tab=Design_Tools_Tab
Latest nxp bsp releases are described on
http://www.nxp.com/products/software-and-tools/software-development-tools/i.mx-software-and-tools/i.mx-6series-i.mx-7series-software-and-development-tool-resources:IMX_SW
unfortunately there is no 4.8 Kernel. In general one can also post this to meta-fsl-arm mailing list
https://lists.yoctoproject.org/listinfo/meta-freescale

Best regards
igor
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Re: Vivante GPU issue

benisandu — Mon, 21 Aug 2017 10:37:49 GMT

Hi Igor,

Thank you for the help, I solved this issue recently by telling the kernel to allocate contiguous memory for the GPU from the <2GB memory range.

Beni

Re: Vivante GPU issue

liyigang — Sat, 21 Mar 2020 11:56:41 GMT

How to tell the kernel to allocate continuous memory？