Re: imx6dl dunfell and kernel: linux-fslc or linux-fslc-imx?

Bas Mevissen

On 2021-02-26 11:26, Terry Barnaby wrote:
On 25/02/2021 12:02, Fabio Estevam wrote:
On Thu, Feb 25, 2021 at 8:58 AM Terry Barnaby <terry@...> wrote:

Many thanks for that info, from Internet info it looked like the
gstreamer-imx package and associated lower libraries/drivers were
needed, I will try another build, the gstreamer video hardware support
wasn't there (as reported by gst-inspect-1.0) when I tried, maybe I got
lost in a tangle of distro, kernel and bitbake targets.
The v4l2dec/enc plugins only show up if the VPU driver were successfully loaded.
Make sure that the VPU (coda) driver is being loaded correctly with
the associated firmware.
After that, these v4l2dec/enc plugins should be reported by gst-inspect.
I discovered where I was going wrong. My Yocto/Freecale build for the
Wandboard with standard fslc-x11 distro and linux-fslc kernel did have
iMX8 video hardware supported and working!
I was originally using a Wandboard supplied binary distro for testing
that was quite old that used gstreamer modules such as imxv4l2sink,
vpuenc_h264, overlaysync etc and most of the Internet documentation
for iMX6's was the same. However the latest dunfell level gstreamer
uses the more generally standard v4l2h264enc gstreamer module that
ends up by using the iMX6 VPU's H264 encoder.
Now I just need to work out if the current iMX6 video hardware API's
allows me to do the video processing pipeline I want/need with
suitably low enough CPU and memory bandwidth usage. Also how to get an
efficient gstreamer video source for performance testing while I await
a working physical camera as videotestsrc uses a lot of CPU for some
reason masking the performance testing.
Good to hear you make progress!

Note I am using Fedora33 as a build platform now, and that seems fine
with dunfell although not yet marked as a known working platform for
I also always use the latest Fedora as my development platform. It usually works without a problem (except for the warning). Only the uninative cannot always keep up with the latet glibc used in Fedora. But that is usually picked up very quickly.

For older Yocto versions, I use systemd containers with a matching OS, like CentOS 7 or Debian. Toradex has a nice write-up on how to set that up.

Many thanks for everyone's help.

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