[yocto] Deactivating KERNEL_FEATURES

[Chuck Wolber]

This question is with respect to the Yocto thud (2.6.x) branch. I have also
reviewed section 2.3.3 and 2.3.4 of the Kernel Development document
<https://www.yoctoproject.org/docs/2.6/kernel-dev/kernel-dev.html>.


My kernel configuration (cfg) seems to be overridden by KERNEL_FEATURES and
it is not clear how to stop this behavior. To take one specific example,
nothing I have tried seems to successfully deactivate the sound
configuration kernel options.

My linux-yocto_4.18.%.bbappend file has the following contents:

FILESEXTRAPATHS_prepend := "${THISDIR}/files:"
SRC_URI_append += "file://0001-kernel-config.cfg"

The following line appears in 0001-kernel-config.cfg:

# CONFIG_SOUND is not set

And yet when I configure the kernel (bitbake -c configure linux-yocto) the
resultant .config in the linux-yocto ${WORKDIR} contains "CONFIG_SOUND=m"
and a plethora of other sound related options that should be turned off. I
did the full kernel build and verified that the .config reflects the final
result in the kernel.

"bitbake -e linux-yocto" contains the following, which seems to explain a
bit:

KERNEL_FEATURES=" features/nfsd/nfsd-enable.scc features/debug/printk.scc
 features/kernel-sample/kernel-sample.scc features/netfilter/netfilter.scc
cfg/virtio.scc cfg/sound.scc cfg/paravirt_kvm.scc "

I should also add that our configuration includes:

DISTRO_FEATURES_remove = " alsa pulseaudio"
DISTRO_FEATURES_BACKFILL_CONSIDERED = " alsa pulseaudio".


How do I ensure that my kernel config gets the last say and is not
overridden?

Thank you,

..Ch:W..
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