ls1046ardb yocto linux-qoriq config is not getting overwritten by custom kernel config

[srechermann]

I'm trying to apply some changes to the kernel configuration to my kernel image and to the device tree. In my custom layer my tree looks like this

meta-custom/
├── COPYING.MIT
├── README
├── classes
│   └── postprocess_image.bbclass
├── conf
│   └── layer.conf
├── recipes-core
│   └── images
│       └── custom-image.bb
├── recipes-example
│   └── example
│       └── example_0.1.bb
└── recipes-kernel
    └── linux
        ├── linux-qoriq
        │   └── ls1046ardb
        │       ├── 0001-usb0-devicetree-dtsi.patch
        │       └── defconfig
        └── linux-qoriq_5.15.bbappend

and thats the content of my linux-qoriq_5.15.bbappend file:

SRC_URI += "file://defconfig"
SRC_URI += "file://0001-usb0-devicetree-dtsi.patch"

FILESEXTRAPATHS:prepend := "${THISDIR}/${PN}:"

PACKAGE_ARCH = "${MACHINE_ARCH}"

When I'm running `bitbake custom-image` during the build process .patch file is copied to the folder where the linux kernel sources reside (`build_ls1046ardb/tmp/work/ls1046ardb-fsl-linux/linux-qoriq`) the devicetree patch get's applied correctly to the .dtsi file (`build_ls1046ardb/tmp/work/ls1046ardb-fsl-linux/linux-qoriq/5.15.32+gitAUTOINC+fa6c316859-r0/git/arch/arm64/boot/dts/freescale/fsl-ls1046a.dtsi`) and everything works as expected. But my defconfig file is not getting copied to `build_ls1046ardb/tmp/work/ls1046ardb-fsl-linux/linux-qoriq/defconfig` respectively not overwrites the defconfig file that resides in the `build_ls1046ardb/tmp/work/ls1046ardb-fsl-linux/linux-qoriq/` folder and is not affecting the `build_ls1046ardb/tmp/work/ls1046ardb-fsl-linux/linux-qoriq/build/.conf` file which is used during to kernel build.  What am I doing wrong here?

[srechermann · Accepted solution]

Solved the Problem:

I'm now using a config fragment "fragement.cfg" instead of the whole defconfig file.

As described in this post https://community.nxp.com/t5/P-Series/qoriq-Linux-append-the-changes-in-kernel-configuration-not/m-p...  I appended DELTA_KERNEL_DEFCONFIG += "fragment.cfg" to my linux-qoriq_5.15.bbappend file and it looks like this now:

SRC_URI += "file://fragment.cfg"
SRC_URI += "file://0001-usb0-devicetree-dtsi.patch"

FILESEXTRAPATHS:prepend := "${THISDIR}/${PN}:"

DELTA_KERNEL_DEFCONFIG += "fragment.cfg"

PACKAGE_ARCH = "${MACHINE_ARCH}"

I have tried using a fragment.cfg file instead of the whole defconfig before but without adding the DELTA_KERNEL_DEFCONFIG += "fragment.cfg" line to my .bbappend file and it did not work.