Where do I apply modifications (Kernel patches, devicetree blobs, etc.) for custom boards and is it possible to build from version 5.0.2?

[Shoadi]

Hello,

we are using a custom development-kit and I would like to know, how (in which file) I can apply the custom firmware to the nix-build and if it is possible to build the jetpack-nixos from Version 5.0.2.

Our customization consists of:
https://f000.backblazeb2.com/file/auvidea-download/images/Jetpack_5_0_2/Jetpack_5_0_2_Xavier_NX_JN(X)30_pre_release.zip

kernel/(Image, Image.gz, kernel_header.tbz2, kernel_supplements.tbz2)
kernel/dtb/(tegra194-.....dtb, tegra194-...dtbo, tegra234....dtb, tegra234...dtbo)

...and originally (using the NVIDIA sdkmanager) we just move the content into the
/nvidia/nvidia_sdk/JetPack_X.X.X_Linux_JETSON_XAVIER_NX_TARGETS/Linux_for_Tegra/kernel/*
folder before generating the flash-image.

How can we do this in the jetpack-nixos?

Alternatively there is as well a kernel_src folder available with a whole bunch of devicetree sources etc. - but even though I would like to - atm. I have no idea how to put that together with the jetpack-nixos.

Maybe someone can shed a little bit of light on this.

Thanks a lot in advance and have a great day,

Michael