IMX28 EVK Main Line kernel

[ganeshh]

Hello,

The Kernel version supported for IMX28 is Linux 2.6.35. How can i use a main line kernel version in IMX28 EVK  i need kernel version 3.0 or greater. How to accomplish this using Yocto or can i accomplish this using Ltib itself?

[fabio_estevam]

In Yocto you can select the 2.6.35 kernel or 3.14. Please write to meta-fsl-arm and the folks there can help you.

[ganeshh]

@Fabio Estevam @Alejandro Lozano Lozano @jamesbone  By default in yocto am getting 2.6.35. Where should i change in order to change the kernel to 3.0 or greater

[alejandrolozan1]

Hi have tried what Fabio mentioned, but I could get the 2.6.35 of mainline kernel.

As far as I understood kernel 3.x was not provided for imx28.

Best Regards,

Alejandro

[fabio_estevam]

Alejandro,

Mainline kernel does support mx28.

[alejandrolozan1]

Thanks Fabio,

But kernel 3.10 is available for imx28?

Best Regards,

Alejandro

[fabio_estevam]

There is mx28 support in 3.10, but just use the latest and greatest instead.

[ganeshh]

Hello,

@OtavioSalvador @Fabio Estevam

What are the step to build 3.14 or 3.10 kernel for imx28? Can you explain How to accomplish this in yocto?

[fabio_estevam]

Take a look at:

Task #5 - Kernel

[OtavioSalvador]

I'd advice to use the 3.14 kernel with MX28.

[dariuszzawisko]

Hi Otavio,

To change the kernel version I have to use:

PREFERRED_PROVIDER_virtual/kernel = "linux-fslc"

PREFERRED_VERSION_linux-fslc = "3.14%"

Will it work with the machine imx28evk from the meta-fsl-arm layer?
Or I have to to use the custom machine m28evk from meta-fsl-arm-extra?
Or it doesn't matter because both machines have SOC_FAMILY = "mxs:mx28" and I can use any machine with mx28?

What is the best kernel choice in your opinion?

2.6.35, 3.14 or maybe latest 3.18?

Best Regards

Darek

[OtavioSalvador]

The preferred version settings shouldn't be necessary.

As you'll end doing more modifications, I would make a custom machine file in your company's layer so you can track it easily. m28evk is closer to what you need as it uses DENX's kernel which does not include FSL-specific headers as FSLC kernel.

[dariuszzawisko]

I checked the m28evk.conf file and it has the kernel linux-fslc. The m53evk machine has the kernel linux-denx.
I don't know the m28evk board but our board is really similar to imx28evk (not to many changes in the kernel) and I already knew all differences.
I will try build two versions m28evk and imx28evk with the linux-fslc and compare results.

I only have to ensure myself when we build the kernel linux-fslc should we use the command bitbake -c menuconfig linux-fslc instead of linux-imx?

[OtavioSalvador]

You need to have the provider and version right. Check m28evk.conf file and see the overrides it has due mainline kernel.         

[fabio_estevam]

Try passing PREFERRED_PROVIDER_virtual/kernel = "linux-fslc" in your board conf file.

If you still have issues, please enter a post into meta-fsl-arm mailing list, as it is a more appropriate place to discuss FSL Yocto related topics.

[jamesbone]

alejandrolozano, can you please check this out?