[yocto] incohenrence between defconf, .config and /proc/config.gz

[Khem Raj]

On Tue, Sep 10, 2019 at 2:45 AM María del Mar Velasco AERTEC Solutions –
Aerospace & Aviation <mvelasco at aertecsolutions.com> wrote:

> Hello all,
>
>
>
> I have found that if I write the image using the created *.wic file,
> kernel config is correctly updated (/proc/config.gz and .config are
> coherent). However if I use the created *.ext4 file to write a rootfs
> partition of target, previous kernel config still remains (kernel config
> used when target was written for first time using *.wic file still remains).
>
>
>
> Any idea about how to keep kernel config updates in *.ext4 file?
>
>
>

Ext4 is just rootfs without new kernel I think that’s why you see old
.config since it’s bundled into kernel  binary

With wic you write full disk along with new kernel

> Thanks in advance
>
>
>
> *De:* María del Mar Velasco AERTEC Solutions – Aerospace & Aviation
> *Enviado el:* viernes, 6 de septiembre de 2019 10:50
> *Para:* 'yocto at yoctoproject.org' <yocto at yoctoproject.org>
> *Asunto:* incohenrence between defconf, .config and /proc/config.gz
>
>
>
> Dear all,
>
>
>
> I have built an image after doing changes in kernel config by adding a
> layer that adds lines in .config file. This changes lead me to an undesired
> configuration, so I decided to undo the last kernel config. When I remove
> the layer that adds lines in .config file, I ensure that kernel is clean by
> doing bitbake -c cleanall linux-xxx. Then I build again the image. I can
> see .config file is exactly equal than defconf kernel file. However, when I
> write image into the target, /proc/config.gz file is inconsistent with
> .config file and it preserves some lines that are missing in .config file.
>
>
>
> Could somebody give me an advice about this issue? Why /proc/config.gz is
> not equal than .config file?
>
>
>
> Thanks in advance
> --
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