Re: [meta-freescale] imx6dl dunfell and kernel: linux-fslc or linux-fslc-imx?

["Bas Mevissen" <abuse@basmevissen.nl>]

On 2021-02-25 13:32, Andrey Zhizhikin wrote:
> Hello Bas,
> 
> On Thu, Feb 25, 2021 at 1:18 PM Bas Mevissen <abuse@basmevissen.nl> 
> wrote:
>> 
>> On 2021-02-25 12:21, Otavio Salvador wrote:
>> > Em qui., 25 de fev. de 2021 às 06:53, Terry Barnaby
>> > <terry@beam.ltd.uk> escreveu:
>> >>  From what I am seeing I will have to use a NXP fsl-* based
>> >> distribution
>> >> to support the imx hardware video processing features. I have built
>> >> such
>> >> a distro with both linux-fslc-imx and limux-imx kernels (I think!) for
>> >> the Wandboard, which boots and runs but the HDMI display was not
>> >> functional. I will persevere looking at that.
>> >
>> > No, you don't. You can use linux-fslc (mainline) and fslc-* distros as
>> > i.MX6 has full mainline support. At O.S. Systems we have been using
>> > Linux mainline with many customers with great success.
>> >
>> 
>> Wouldn't make sense to first evaluate the performance of the platform
>> (as Terry plans to do) first on an NXP fsl-* distro? In that case one
>> can get direct support from NXP if required. After that, derive your 
>> own
>> distro from fslc-*.
> 
> This might not be quite indicative, as the NXP kernel might have some
> "shortcuts" to boost performance in certain areas, sacrificing
> conformance of the source code.
> 

At least you get an idea of what the HW platform can do.

> You might experience the situation that video performs quite well, but
> then after opting for NXP kernel - you might find that some other
> areas are not working as expected (some other domains). This would put
> you in a situation that you've already committed to choose and deploy
> the NXP-based BSP and would leave you to solve the issues in those
> domains on your own efforts.
> 
> This is my pure speculation here, so take it with a grain of salt 
> though. :)
> 
IMHO, you should never base your *product* on FSL. It is (at least, that 
is what was told me by (then) Freescale field engineers) only there to 
demonstrate the platform. Maybe that has changed over time.

When there is a huge performance difference between fsl and fslc, it 
needs to be resolved.

> IMHO, this should be considered and before the final product receives
> commitment to use either of BSP flavors - all areas should be
> validated, not only the performance aspects of Multimedia domain.
> 

Yes, when you have decided on the hardware to use. If you are evaluating 
the hardware to see whether it meets your requirements, you might want 
to take the option that gives you the best impression of the performance 
that can be achieved without too much of a hassle.
(it is an important step to do, at a stage of the development where time 
is usually very limited, so you want a quick but reliable result).

>> 
>> BTW Would kernel.org stable kernel work as well on i.MX6 if you need
>> graphics and video? I used it successfully for headless IOT
>> applications.
> 
> As Fabio already indicated - this is possible.
> 

Fabio said "mainline". I'm not sure whether meant linux-fslc (as Otavio 
used it) or kernel.org.
So I wanted to check that.

>> 
>> Bas.
>> 
> 
> --
> Regards,
> Andrey.
> 
> 
>