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NVIDIA Jetson - Device Tree Overlay: Difference between revisions
NVIDIA Jetson - Device Tree Overlay (view source)
Revision as of 01:58, 17 February 2022
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===Creating a Simple Device Tree Overlay=== | ===Creating a Simple Device Tree Overlay=== | ||
To create a simple device tree overlay to add a new custom property for Jetson Xavier NX Developer Kit | To create a simple device tree overlay to add a new custom property for Jetson Xavier NX Developer Kit and attach it to the 40‑pin expansion header, create a file named my-overlay.dts on the target platform with the following contents: | ||
<source lang="c"> | <source lang="c"> | ||
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dtc -O dtb -o my-overlay.dtbo -@ my-overlay.dts | dtc -O dtb -o my-overlay.dtbo -@ my-overlay.dts | ||
</source> | </source> | ||
After you copy the new overlay file to the /boot directory, Jetson‑IO finds the overlay file and allows you to apply it, If you use an incorrect compatible value, the | After you copy the new overlay file to the /boot directory, Jetson‑IO finds the overlay file and allows you to apply it, If you use an incorrect compatible value, the DT overlay is not listed | ||
<source lang="bash"> | <source lang="bash"> | ||
sudo cp my-overlay.dtbo /boot | sudo cp my-overlay.dtbo /boot | ||
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===Remove overlay changes applied=== | ===Remove overlay changes applied=== | ||
The changes of the DT overlay are applied over the DT original and is created a new device tree. The name of the resulting device tree combines the original DT name and the overlay name. | The changes of the DT overlay are applied over the DT original and is created a new device tree. The name of the resulting device tree combines the original DT name and the overlay name. <code>/boot/kernel_tegra194-p3668-all-p3509-0000-my-jetson-overlay-example.dtb</code> | ||
To use the new DT, Jetson‑IO creates a new entry in <code>/boot/extlinux/extlinux.conf</code> | |||
To use the new DT creates a new entry in <code>/boot/extlinux/extlinux.conf</code> | |||
This is the new entry added when is added the overlay: | This is the new entry added when is added the overlay: | ||