i.MX Processors中的主题 Re: IMX6 solo VPU unit test failed

IMX6 solo VPU unit test failed

jlsampayo — Fri, 26 Mar 2021 19:15:29 GMT

Hi all, I'm trying to perform video playback on a custom board using IMX6 Solo with Linux 4.14.98,

for that I build Gstreamer using the Yocto recipes:

DISTRO=fsl-imx-fb MACHINE=imx6solosabreauto source fsl-setup-release.sh -b mybuilddir

Then:

bitbake gstreamer1.0

bitbake gstreamer1.0-plugins-base

bitbake gstreamer1.0-plugins-good

bitbake gstreamer1.0-plugins-bad

bitbake gstreamer1.0-libav

bitbake imx-vpuwrap

bitbake imx-gst1.0-plugin

bitbake libimxvpuapi

bitbake gstreamer1.0-plugins-ugly

bitbake gstreamer1.0-libav

bitbake firmware-imx

Afterwards put the resulted plugins, libraries, firmware and binaries into my target.

But when I execute a pipeline that uses vpudec, such as:

# GST_DEBUG=3 ./gst-launch-1.0 filesrc location=/mnt/file.avi typefind=true ! av idemux ! vpudec ! imxv4l2sink

# GST_DEBUG=3 ./gst-launch-1.0 -v playbin uri=file:///mnt/temp.mp4

Then the following error occurs:

open failed: No such file or directory
[ERR] Error: Unable to open vpu shared memory file
[ERR] IOSystemInit() failure.

The same error occurs by executing the VPU unit test

# ./mxc_vpu_test.out -D "-i ./akiyo.mp4 -f 0 -t 1"

---- Running < ./mxc_vpu_test.out > test ----

[INFO] VPU test program built on Mar 14 2021 23:38:06
open failed: No such file or directory
[ERR] Error: Unable to open vpu shared memory file
[ERR] IOSystemInit() failure.
[ERR] VPU Init Failure.

Even though the vpu device is listed under /dev/.

This error is not showing when using IMXVPUDEC and a different videosink, nevertheless I'm not able to see anything on the screen (attached log).

# GST_DEBUG=4 ./gst-launch-1.0 filesrc location=/mnt/temp.mp4 typefind=true ! qt demux ! queue ! imxvpudec ! imxipuvideosink

Re: IMX6 solo VPU unit test failed

igorpadykov — Sat, 27 Mar 2021 04:05:13 GMT

Hi jlsampayo

one can try Linux 4.14.98_2.0.0 Demo Images

i.MX 6QuadPlus, i.MX 6Quad, i.MX 6DualPlus, i.MX 6Dual, i.MX 6DualLite, i.MX 6Solo, i.MX 6SoloX

use Linux Guide vpu commands from Documentation

Best regards
igor

Re: IMX6 solo VPU unit test failed

jlsampayo — Wed, 26 May 2021 21:03:45 GMT

Hi,

The problem related to VPU:

open failed: No such file or directory
[ERR] Error: Unable to open vpu shared memory file
[ERR] IOSystemInit() failure.

is solved by enabling in Kernel the following option: CONFIG_TMPFS

I noticed in the source code of vpu_util.c, that the failure came when it tried to open the "/dev/shm/vpu" which was not in my target, then looking further I found how to generate and use the /dev/shm.

Now Im able to run the unit test and verify VPU.

Kind Regards

Jose Sampayo

Re: IMX6 solo VPU unit test failed

jlsampayo — Wed, 26 May 2021 21:06:30 GMT

forgot to mention that in the documentation for TMPFS, said that, one must create first the subdirectory where we are going to mount the tmpfs, in this case, create the /dev/shm directory in the target before mount the tmpfs.

So, in the target:

mkdir /dev/shm

mount -t tmpfs tmpfs /dev/shm