[yocto] Building kernel backports for ARM with Yocto

[Khem Raj]

On Wed, Oct 18, 2017 at 3:13 PM, Marlon Smith <marlon.smith10 at gmail.com> wrote:
> Hi everyone,
>
> I'm trying to build the Linux backports project to get updated wifi drivers
> on an older kernel.  The problem is that when building backports, it first
> builds several tools that need to be run natively before cross-compiling the
> rest of the project.
>
> I know how to write a bitbake recipe to compile natively, and how to write
> one to build for the target, but I can't figure out how to combine the two.
> The backports project has steps for LTIB:
>
>  %Build
>  export PATH=$UNSPOOF_PATH
>
>  make menuconfig prefix=%{_prefix} \
>    CROSS_COMPILE=${TOOLCHAIN_PATH}/bin/${TOOLCHAIN_PREFIX} \
>    ARCH=$LINTARCH KLIB=${TOP}/rootfs/lib/modules/%{kversion} \
>    KLIB_BUILD=${TOP}/rpm/BUILD/linux
>
>  export PATH=$SPOOF_PATH
>
>  make prefix=%{_prefix} \
>    CROSS_COMPILE=${TOOLCHAIN_PATH}/bin/${TOOLCHAIN_PREFIX} \
>    ARCH=$LINTARCH KLIB=${TOP}/rootfs/lib/modules/%{kversion} \
>    KLIB_BUILD=${TOP}/rpm/BUILD/linux
>
>
> I believe what I need is an equivalent to the line export PATH=$UNSPOOF_PATH
> but I can't find anything in the Yocto documentation or mailing lists that
> would be equivalent to that.
>
>
> Any help would be much appreciated!

You might try this out

https://github.com/kraj/meta-himvis/blob/master/recipes-kernel/linux-backports/linux-backports_4.14-rc4.bb

it does not work out of box but with few fixes here and there it should work

>
>
> Thanks
>
>
> Marlon
>
>
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