[yocto] QEMU kernel defconfigs

[Scott Rifenbark]

On Thu, Nov 15, 2018 at 12:08 PM Bruce Ashfield <
bruce.ashfield at windriver.com> wrote:

> On 2018-11-15 12:29 p.m., Jon Mason wrote:
> > I'm having difficulty determining where the kernel defconfigs are
> > defined and located.  I'm specifically looking for the qemuarm and
> > qemuarm64 kernel defconfigs.  I've looked at the relevant
> > documentation,
> https://www.yoctoproject.org/docs/2.5.1/kernel-dev/kernel-dev.html#using-an-in-tree-defconfig-file
> > and
> > no SRC_URI with defconfig or KBUILD_DEFCONFIG_KMACHINE defined in
> > meta/recipes-kernel/linux/linux-yocto_4.18.bb
> >
> > What am I missing?
>
> The reference machines with linux-yocto don't use defconfigs at all.
> They are fully assembled from the configuration fragments in the
> kernel-cache repo.
>
> You'll see the location of the kernel-cache, and the routines that
> gather up the fragments in the linux-yocto* recipes.
>
> The kernel development manual has that detail as well:
>
>
> https://www.yoctoproject.org/docs/2.5.1/kernel-dev/kernel-dev.html#kernel-dev-advanced
>
> Bruce
>
> >
> > Also, "A defconfig file is simply a .config renamed to "defconfig"."
> > is not correct.  A properly created defconfig is created by `make
> > savedefconfig` and is a minimal file which only has the delta between
> > the desired config and defaults from the Kconfig files.
> >
> https://www.yoctoproject.org/docs/2.5.1/kernel-dev/kernel-dev.html#creating-a-defconfig-file
> >
> > Thanks,
> > Jon
>

Jon - see
https://www.yoctoproject.org/docs/2.5.1/kernel-dev/kernel-dev.html#creating-a-defconfig-file
for some re-phrasing.

>
>
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