[yocto] arm yocto-linux custom defconfig not working

[Bruce Ashfield]

On Thu, Jun 6, 2019 at 10:06 AM Pierluigi Greto
<pierluigi.greto at bisdn.de> wrote:
>
> Hi,
>
> thank you for the reply. In the attahcment the layer for the kernel and
> the layer with the machine configurations.

Thanks for the layers. I was able to pull together a thud build env
and do some tests.

For me, I see the defconfig being used as expected. The key words
there may be "as expected".

How were you determining that the defconfig wasn't being used ?

There are always some minor differences between most defconfigs and
what ends up  the .config due to minor kernel version differences, or
the fact that by default, when a defconfig is fed through the
linux-yocto config process it assumes that the defconfig is fairly
complete and is intended to be a full specification .. as such, it
runs merge config with allnoconfig first, and then applies the
defconfig on top. So if something was perhaps being selected by an
option, or a default configuration was being assumed .. you will see
some minor deltas.

Bruce

>
> Pierluigi
>
> On 06/06/19 15:47, Bruce Ashfield wrote:
> > On Thu, Jun 6, 2019 at 9:38 AM Pierluigi Greto <pierluigi.greto at bisdn.de> wrote:
> >> Hi,
> >>
> >> I have to create a custom 4.14.49 linux kernel. In my recipe I have added my defconfig, but yocto it's not taking in consideration the defconfig. Instead it's building the kernel using the default values. Also the compilation task is to fast for building the kernel. My target system is an arm architecture (DEFAULTTUNE ?= "cortexa9").
> >> I have tried also to append this on my recipe but the result does not change:
> > Can you share your kernel recipe and layer(s) + defconfig ? Things are
> > working fine for me, but if I can see (and build) your recipes perhaps
> > something can be spotted.
> >
> > Bruce
> >
> >> do_compile_prepend() {
> >>       cp ${WORKDIR}/defconfig ${B}/defconfig
> >>       cp ${WORKDIR}/defconfig ${B}/.config
> >>       oe_runmake -C ${B} ARCH=${ARCH} ${S}/defconfig
> >> }
> >>
> >> If i try to "cheat" and add cp ${WORKDIR}/defconfig ${S}/.config on the do_compile_prepend obviously make will not work: "kernel-source is not clean, please run 'make mrprop' ".
> >>
> >> Any suggestions is very welcome.
> >>
> >> Thank you,
> >> Pierluigi
> >>
> >> --
> >> _______________________________________________
> >> yocto mailing list
> >> yocto at yoctoproject.org
> >> https://lists.yoctoproject.org/listinfo/yocto
> >
> >



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