[meta-freescale] How to apply Preempt-rt patch for i.mx6ul board in yocto

[Daiane Angolini]

On Fri, Jun 16, 2017 at 3:20 AM, Hiro Sato <sato.hirotoshi.toa at gmail.com> wrote:
> Hi all,
>
>
> I would like to apply PREEMPT-RT patch for i.mx6ul board in yocto.
>
> However I was not able to do it, so I would like you to tell me the way.
>
>
>
> Right now I use yocto 2.0 (Jethro).
>
> I found linux-yocto-rt_4.1.bb file in
> sources/poky/meta/recipes-kernel/linux.
>
> After bitbake I checked $ uname -a, but it did not say PREEMPT RT.
>
>
>
> I think I would be able to make preempt rt kernel image if I could correctly
> apply linux-yocto-rt_4.1.bb.
>
> How can I apply the recipe ? Or if there are other way to make preempt rt
> kernel image, would you tell me the way please?
>
>
>
> And I found a readme file which says "In order to build the image with the
> linux-yocto-rt kernel, be sure to include the following line in your
> local.conf, bblayers.conf, or your $MACHINE.conf.
>
> PREFERRED_PROVIDER_virtual/kernel = "linux-yocto-rt" " in
> sources/poky/meta/recipes-rt.
>
> So I added the line in my bblayers.conf and local.conf, but I could not make
> rt image.
>
> In the readme file, it also says about core-image-minimal. It means that we
> can use linux-yocto-rt only in core-image-minimal image? I would like to use
> other image.
>
>
>
> Furthermore, I found linux-fslc-mx6-rt_3.14-1.0.x.bb in
> sources/meta-fsl-arm/receipes-kernel/linux.
>
> Does it have relation?

Have you tried this kernel? I don't remember if it has imx6UL support,
but at least it's a closer base kernel with imx6 support.

I don't think linux-yocto-rt_4.1 has imx6UL support also, as imx6UL
was not around on jethro. imx6ulevk machine file was introduced only
2016.

Maybe it's easier to use a more current yocto release instead.


Daiane

>
>
>
> Thank you for reading.
>
> I am looking forward to your reply.
>
>
>
> Best regards,
>
> Sato
>
>
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