Custom carier board adaptation

I’m trying to find a manual with steps on how to adapt the file system, bootloader, and kernel for my carrier board for Jetson AGX Orin module.
I read Jetson Module Adaptation and Bring-Up but these steps are not there.

Let’s say I have Ubuntu and nothing else.
1 What do I need to install,
2 in which folders should I change the files,
3 and with what commands should I compile bootloader, and file system, kernel? and maybe something else that I don’t know.
Please give me a link to such a document, I can’t find it

  1. The only bootloader you can fully customize is the UEFI. The source code is over this public github.
    GitHub - NVIDIA/edk2-nvidia: NVIDIA EDK2 platform support
    After you build it up, replace the old file under your Linux_for_Tegra/bootloader directory and do reflash.

  2. The kernel source code are put in this website.
    Jetson Linux Archive | NVIDIA Developer
    After you build it up, replace it Linux_for_Tegra/kernel/Image and do reflash.
    If you don’t want to reflash the whole board, put it to your Jetson /boot/Image and reboot the Jetson will also take effect.

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