[yocto] [meta-raspberrypi] how to apply custom kernel configuration?

[Khem Raj]

On Sat, May 6, 2017 at 9:45 AM, Andrea Galbusera <gizero at gmail.com> wrote:
> Hi!
>
> I was wondering how to apply some extra kernel configuration from a custom
> layer via a bbappend. I know that with meta-raspberrypi there exist some
> variables you can define in local.conf that will drive how the kernel is
> configured: but what about some very specific device driver nobody than me
> is interest in? To me it seems it doesn't deserve a dedicated global oe
> variable.
>
> Some investigation showed this topic already came up on the list from time
> to time in the past (most recently in [1]). To me it looks like there is
> some common desire to get rid of the current "magic" carried out by
> linux-rpi.inc by moving the linux-raspberrypi recipes into the configuration
> fragments style.
>
> In the short term, my question are: how do you guys manage to add your
> custom kernel configurations? Do you rely on full blown static defconfigs?
> Have you found any reliable way to do "differential" configurations with the
> current state of metadata?
>
> In a longer term, I'd really like to help moving towards supporting
> configuration fragments for linux-raspberrypi, but I suspect it'd be a too
> much hard task for my current understanding of the whole kernel
> configuration workflow. Do you know of anyone already working on this or
> does anyone have a clear idea of what is needed to get the work done? Some
> times ago I tried to resurrect [2], but with no luck, probably due to some
> changes that happened in the linux-yocto files in the meanwhile.
>
> Comments from gurus are welcome! ;-)

I have been hinting at using yocto kernel tooling. Idea is worth a pull request
care sending one ?

>
> [1] https://lists.yoctoproject.org/pipermail/yocto/2016-December/033559.html
> [2] https://lists.yoctoproject.org/pipermail/yocto/2015-October/027034.html
>
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