Device-tree modification question

Very new to this - can anyone point me to a guide on locating and editing a device-tree? I cannot find a starting point on this.

Suggest to do the study from Jetson AGX Orin Platform Adaptation and Bring-Up — Jetson Linux
Developer Guide 34.1 documentation (

Thank you. That does help.
Simple question that is still hanging me up - where do I find the directory?

Is this expected be on the Orin target system or my linux host I used for flashing? I cannot locate these on either system.

You need to download the source code separately… Search “L4T archive” website first.

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