[yocto] arm yocto-linux custom defconfig not working

[Pierluigi Greto]

Hi,

I have to create a custom 4.14.49 linux kernel. In my recipe I have 
added my defconfig 
<https://github.com/opencomputeproject/OpenNetworkLinux/blob/master/packages/base/any/kernels/4.14-lts/configs/armel-iproc-all/armel-iproc-all.config>, 
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:

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_prependobviously make will not work: "kernel-source is not 
clean, please run 'make mrprop' ".

Any suggestions is very welcome.

Thank you,
Pierluigi

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