[yocto] Build external module against Yocto kernel

[Brian Lloyd]

Try this in work documentation and let us know how it helps or if there
is something missing that would help more:
http://www.yoctoproject.org/docs/hart/kernel-dev/kernel-dev.html#incorporating-out-of-tree-modules

I just did the exact same thing and was happy to discover there is
support in yocto for doing just this.

Brian

On Mon, 2013-01-14 at 23:27 +0000, Patrick Turley wrote:

> I have to build a module from a third-party that has nothing to do with Yocto.
> 
> I want to build this module against the kernel Yocto is giving me.
> 
> The Make file for this module has a build command like this:
> 
>     make -C $(LINUX_DIR) M=`pwd` $(ENV) \
>         EXTRA_CFLAGS="$(EXTRA_CFLAGS)" modules
> 
> Obviously, this command needs to connect with either the Linux source tree or something like a "kernel-headers" package.
> 
> I used the meta-toolchain-sdk recipe to produce an SDK, and I installed it. Unfortunately, I don't see a "kernel-header" equivalent in there.
> 
> This leads me to imagine I must point this command at some sub-tree within the Yocto output (probably under tmp/sysroots). And, if I want that tree available elsewhere, I have to package it up into a tarball and transport it.
> 
> Usually, Yocto is way ahead of me on these sorts of things, and there's already a graceful way to deal with this -- I just haven't figure it out yet.
> 
> What am I missing?
> 
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