Hi,
Yes, you have to re-flash the system. Please do
[1] Follow Quick Start section to download the system files for flashing Orin Nano developer kit. And follow the steps to Orin Nano developer kit.
Quick Start — NVIDIA Jetson Linux Developer Guide 1 documentation
[2] So now you have Linux_for_Tegra folder which is the default Jetpack release. And you can run initrd command to flash Orin Nano developer kit. Assume it is
~/jp61/Linux_for_Tegra
Please create a folder
~/jp61/src
Download source code to the folder and run
~/jp61/src$ sudo tar xpf public_sources.tbz2
And go to the directory for building kernel
~/jp61/src/Linux_for_Tegra/source
[3] You can follow the guidance to build kernel and NVIDIA oot modules
Kernel Customization — NVIDIA Jetson Linux Developer Guide 1 documentation
The path of installation is
$ export INSTALL_MOD_PATH=~/jp61/Linux_for_Tegra/rootfs/
After building/installing kernel and oot modules, please remember to do
$ cd ~/jp61/Linux_for_Tegra
$ sudo ./tools/l4t_update_initrd.sh
For Orin Nano developer kit, you shall not need to rebuild DTBs.
[4] Go to the folder and see if you can flash Orin Nano developer kit with self-built kernel image. Same initrd command should work
~/jp61/Linux_for_Tegra
[5] So now you can build and flash Orin Nano developer kit. And then you can enable/disable kernel cofigs for your use-case by modifying
arch/arm64/configs/defconfig
arch/arm64/configs/tegra_prod_defconfig
And re-do step [3][4]