[yocto] Building kernel backports for ARM with Yocto

[Marlon Smith]

On Thu, 2017-10-19 at 14:18 -0700, Khem Raj wrote:
> 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 gma
> > > il.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/li
> > > nux-
> > > 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

Ok I'll give that a try.  Thanks for the help!

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