[poky] bitbake variable override (virtual/kernel)

[Richard Purdie]

On Mon, 2015-12-28 at 18:52 +0530, Prasant J wrote:
> Hi,
> 
> I'm putting together my custom layer with my machine configuration. I
> have set PREFERRED_PROVIDER_virtual/kernel to build my kernel but it
> is always overridden by distro configuration. Below is the output of
> bitbake environment:
> 
> 
> # $PREFERRED_PROVIDER_virtual/kernel [6 operations]
> #   set /home/user/fsl-L3.14.52_1.1.0_ga/fsl-release-bsp/sources/meta
> -fsl-arm/conf/machine/include/imx-base.inc:117
> #     [_defaultval] "linux-imx"
> #   finalize ast.py:325 [finalize]
> #     "was: linux-imx"
> #   override[mx6]:set /home/user/fsl-L3.14.52_1.1.0_ga/fsl-release
> -bsp/build-fb/conf/local.conf:26
> #     "linux-myboard-imx6"
> #   override[mx6]:set /home/user/fsl-L3.14.52_1.1.0_ga/fsl-release
> -bsp/sources/mylayer/meta-newlayer/conf/machine/mymachine.conf:17
> #     "linux-myboard-imx6"
> #   override[mx6]:set /home/user/fsl-L3.14.52_1.1.0_ga/fsl-release
> -bsp/sources/meta-fsl-bsp-release/imx/meta
> -sdk/conf/distro/include/fsl-imx-preferred-env.inc:7
> #     "linux-imx"
> #   finalize override[mx6]:
> #     "linux-imx"
> # pre-expansion value:
> #   "linux-imx"
> PREFERRED_PROVIDER_virtual/kernel="linux-imx"
> 
> From the above it seems that distro configuration overrides my custom
> machine + glocal conf/local.conf configuration.
> 
> 
> Is it expected? So should I also create a custom DISTRO?
> Is there a way to extend the DISTRO configuration and only override
> virtual/kernel value?
> 
> 
> Any input will be of help to me. Thanks!

Distro overrides are more powerful so yes, this isn't surprising. You
could disable the mx6 override (which is probably added to
MACHINEOVERRIDES or DISTROOVERRIDES)?

Something like:

MACHINEOVERRIDES_remove = ":mx6"

might even work.

Cheers,

Richard