[yocto] Building kernel backports for ARM with Yocto

[Khem Raj]

On Thu, Oct 19, 2017 at 12:38 PM, Marlon Smith <marlon.smith10 at gmail.com> wrote:
> On Wed, 2017-10-18 at 22:50 -0700, Khem Raj wrote:
>> On Wed, Oct 18, 2017 at 3:13 PM, Marlon Smith <marlon.smith10 at gmail.c
>> om> 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
>
> It looks like that recipe inherits backports_module and kernel-
> backports_module-split.. do I need those files as well?
>

backports_module is merged into recipe itsellf. Other one can be
replaced with inehrtiting
module bbclasss

>>
>> >
>> >
>> >
>> > Thanks
>> >
>> >
>> > Marlon
>> >
>> >
>> > --
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>> >