[yocto] Is KCONFIG_MODE test backwards in kernel-yocto.bbclass?

[Bruce Ashfield]

On 2018-09-25 10:03 PM, Aaron Cohen wrote:
> http://git.yoctoproject.org/cgit/cgit.cgi/poky/tree/meta/classes/kernel-yocto.bbclass#n297
> 
> With no KCONFIG_MODE specified, we check if the user has copied a 
> defconfig to workdir, and then use allnoconfig if so. Shouldn't we be 
> using alldefconfig in this case?
> 
> The result currently is that if you use a defconfig file that you add to 
> SRC_URI, much of it won't work, because it's been set to no by 
> allnoconfig, and it's not super-obvious, to me at least, why.

Nope. This is fully intentional. The defconfig is traditionally
a complete .config that specifies all values. As such, we clear
the settings with allnoconfig and then apply it to the tree.

If you want a minimal .config (like fragments, etc), that adds
only non-default settings, we use alldefconfig and then apply
the fragments.

Cheers,

Bruce

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