[yocto] How to switch kernel version without touching PREFERED VERSION

[Valentin Le bescond]

@Gary, you were right on the spelling. It always works best without
spelling mistakes (inside "meta-wolfson/conf/layer.conf")

I did indeed meant local.conf, not layer.conf in the build dir.

I wanted to use an older kernel because the wolfson audio card for the rpi
is distributed as a set of patch dedicated to the 3.10 kernel.

But then I tried the build and even with the right kernel, the patch list
threw errors.

Anyway, I found that cirrus logic just bought wolfson and created a new
audio extension for the rpi.
So I dumped the idea of the meta-wolfson layer and will start with
meta-cirrus.

This time the bbappend will have to change the github source directly as
cirrus provides the whole kernel (3.12 amongst others...).

Well thank you all very much !

Valentin






2015-02-18 17:48 GMT+01:00 Paul Eggleton <paul.eggleton at linux.intel.com>:

> On Wednesday 18 February 2015 17:33:26 Valentin Le bescond wrote:
> > I tryed editing /meta-wolfson/conf/layer.conf or /build/conf/layer.conf,
> > adding :
> > PREFERED_VERSION_linux-raspberrypi = "3.10.%"
> >
> > but neither worked (still using 3.12)
>
> I assume you tried build/conf/local.conf not build/conf/layer.conf?
>
> If so, that should have worked. You can run bitbake -e | less and look
> through
> the history to see what is overriding it if it doesn't work.
>
> > I endded up editing meta-raspberrypi's machine configuration and it works
> > fine.
> >
> > It's good, but that means I will need to apply this change to every
> > building machine I will use, or fork the meta-raspberrypi repo, witch is
> > another story.
> > I was hoping to keep everything inside my wolfson layer. too bad.
>
> FWIW, in general forcing a particular kernel version from a layer.conf like
> this isn't very good practice. People who use your layer may not expect to
> have the kernel version switched just by adding it to their bblayers.conf.
> (There may perhaps be mitigating circumstances in this case.)
>
> Cheers,
> Paul
>
> --
>
> Paul Eggleton
> Intel Open Source Technology Centre
>
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