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PR #13045 from Nir-Az: Update NVIDIA docs
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doc/installation_jetson.md

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# Nvidia Jetson Devices
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# NVIDIA® Jetson Devices
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**NOTE**: See [support-matrix.md](./support-matrix.md) to learn more about Jetson support for RealSense devices.
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### 1. Prerequisites
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* Nvidia® **Jetson Nano™**, **Jetson TX2™**, **Jetson AGX Xavier™** or **Jetson Orin™** board (may also work on other Jetson devices)
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* NVIDIA® **Jetson Nano™**, **Jetson TX2™**, **Jetson AGX Xavier™** or **Jetson Orin™** board (may also work on other Jetson devices)
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* A supported RealSense Camera device
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### 2. Establish Developer's Environment
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Follow [official instructions](https://developer.nvidia.com/embedded/learn/getting-started-jetson) to get your board ready. This guide will assume you are using **Nvidia® L4T Ubuntu 16.04/18.04/20.04/22.04** image with kernels 4.9/5.10/5.15. Note that in most cases it is necessary to install a toll named "SDK Manager" to flash and install **Jetson** boards with both the L4T (Linux for Tegra) and Nvidia-specific software packages (CUDA, Tensor Flow, AI, etc.)
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Follow [official instructions](https://developer.nvidia.com/embedded/learn/getting-started-jetson) to get your board ready. This guide will assume you are using **NVIDIA® L4T Ubuntu 18.04/20.04/22.04** image with kernels 4.9/5.10/5.15. Note that in most cases it is necessary to install a toll named "SDK Manager" to flash and install **Jetson** boards with both the L4T (Linux for Tegra) and NVIDIA-specific software packages (CUDA, Tensor Flow, AI, etc.)
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For **Jetson Orin™** with JetPack 6.0 you will need to follow build for MIPI driver as Nvidia released Kernel 5.15 default configuration with disabled HID: [Intel® RealSense™ camera driver for GMSL* interface](https://github.com/IntelRealSense/realsense_mipi_platform_driver)
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For **Jetson Orin™** with JetPack 6.0 you will need to follow build for MIPI driver as NVIDIA released Kernel 5.15 default configuration with disabled HID: [Intel® RealSense™ camera driver for GMSL* interface](https://github.com/IntelRealSense/realsense_mipi_platform_driver)
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For **Jetson Nano™** we strongly recommend enabling the Barrel Jack connector for extra power (See [jetsonhacks.com/jetson-nano-use-more-power/](https://www.jetsonhacks.com/2019/04/10/jetson-nano-use-more-power/) to learn how)
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In order to enable the full capabilities of RealSense devices certain modifications in the kernel (driver) modules shall be applied, such as support of Depth-related streaming formats and access to per-frame metadata attributes. There is a small set of generic kernel changes that are mostly retrofitted with more advanced kernel versions aimed at improving the overall drivers stability.
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Nvidia's L4T delivers an Ubuntu-based distribution with a customized kernel based on version 4.9/5.10. The way the kernel is configured and deployed is different from a desktop Ubuntu image with two notable differences being the list of kernel modules included in default configuration and the way a new image is flashed.
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NVIDIA's L4T delivers an Ubuntu-based distribution with a customized kernel based on version 4.9/5.10. The way the kernel is configured and deployed is different from a desktop Ubuntu image with two notable differences being the list of kernel modules included in default configuration and the way a new image is flashed.
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And while it is possible to rebuild and flash a new kernel image the procedure can be perceived as challenging and shall be performed with extra caution.
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This guide comes with a script that allows to modify the kernel modules with Librealsense2-related patches without replacing the kernel image. The script has been verified with **Jetson AGX Xavier™** board using L4T versions 4.2.3, 4.3, 4.4 (Sept 2020) and 5.0.2. Scroll to the end of the guide for details.
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This guide comes with a script that allows to modify the kernel modules with Librealsense2-related patches without replacing the kernel image. The script has been verified with **Jetson AGX Xavier™** board using L4T versions 4.6.1 (Sept 2020) and 5.0.2. Scroll to the end of the guide for details.
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### 4. Install with Debian Packages
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The minimum JetPack SDK required to run the precompiled Debians is [JetPack version 4.4.1](https://developer.nvidia.com/jetpack-sdk-441-archive) ( L4T 32.4.4 , CUDA version 10.2).
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⮕ Use the V4L Native backend by applying the kernel patching
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The method was verified with **Jetson AGX** boards with JetPack **4.2.3**[L4T 32.2.1,32.2.3], **4.3**[L4T 32.3.1], **4.4**[L4T 32.4.3], **4.5.1**[L4T 32.5.1] and **5.0.2**[L4T 35.1.0].
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The method was verified with **Jetson AGX** boards with JetPack **4.4**[L4T 32.4.3], **4.6.1**[L4T 32.7.1] and **5.0.2**[L4T 35.1.0].
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The method has not yet been verified on the **Jetson Nano** board.
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cmake .. -DBUILD_EXAMPLES=true -DCMAKE_BUILD_TYPE=release -DFORCE_RSUSB_BACKEND=false -DBUILD_WITH_CUDA=true && make -j$(($(nproc)-1)) && sudo make install
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```
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The CMAKE `-DBUILD_WITH_CUDA=true` flag assumes CUDA modules are installed. If not, please reconnect the board to the Ubuntu Host PC and use Nvidia `SDK Manager` tool to install the missing components.
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The CMAKE `-DBUILD_WITH_CUDA=true` flag assumes CUDA modules are installed. If not, please reconnect the board to the Ubuntu Host PC and use NVIDIA `SDK Manager` tool to install the missing components.
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* **Connect Realsense Device, run `realsense-viewer` and inspect the results**
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