Re: QEMU kernel defconfigs


Bruce Ashfield <bruce.ashfield@...>
 

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

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