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Obtaining the kernel and BSP sources is the first step for compiling Jetson Linux in JetPack 5.0.2. This section explains the prerequisites you must meet and the two supported ways to download the sources: synchronizing with Git through the source_sync.sh script, or manually downloading and extracting the official archives from NVIDIA.

Prerequisites

Before obtaining the kernel and BSP sources, ensure your host environment meets the following requirements:

The build will be performed on a Linux host computer using cross-compilation.
JetPack 5.0.2 is already installed on your host system.
The following dependencies are installed:

git-core
build-essential
bc

On Debian-based systems you can install them with:

sudo apt install git-core build-essential bc

Obtaining the Sources

There are two supported ways to obtain the Jetson Linux kernel sources:

Syncing the sources using Git with the source_sync.sh script.
Manually downloading and extracting the sources from the NVIDIA Jetson Linux Archive.

Both approaches generate the same outcome: a full kernel source tree, NVIDIA driver modules, and device tree definitions that align with the JetPack 5.0.2 release.

Syncing the Sources

NVIDIA provides the source_sync.sh script in the Linux_for_Tegra/sources/ directory. This script downloads the kernel, NVIDIA drivers, and device tree sources for the exact JetPack release you are targeting.

Export the location of your JetPack installation. By default, the SDK Manager installs JetPack 5.0.2 for Jetson AGX Orin under your home directory:
```
export DEVDIR=$HOME/nvidia/nvidia_sdk/JetPack_5.0.2_Linux_JETSON_AGX_ORIN_TARGETS/Linux_for_Tegra
```

Run the script with the appropriate options:

cd $DEVDIR
./source_sync.sh -k -t jetson_35.1

Where:

-k fetches all kernel-related sources (kernel, nvgpu, NVIDIA drivers, device tree files, etc.).
-t jetson_35.1 specifies the tag that corresponds to JetPack 5.0.2 (L4T r35.1).

After the script finishes, the folder $DEVDIR/sources/ will contain the complete source tree, ready for compilation.

Manually Downloading the Sources

If you cannot use source_sync.sh (for example, in a restricted network environment), you can download and extract the sources manually.

Export the location of your JetPack installation:

export DEVDIR=$HOME/nvidia/nvidia_sdk/JetPack_5.0.2_Linux_JETSON_AGX_ORIN_TARGETS/Linux_for_Tegra

Download the archives using wget:

cd ~/Downloads
wget https://developer.nvidia.com/downloads/embedded/l4t/r35_release_v1.0/sources/public_sources.tbz2

Extract the top-level archive:
```
tar xpf public_sources.tbz2 -C .
```

Create the sources/ directory and unpack the kernel sources:

cd $DEVDIR
mkdir -p sources
tar xpf ~/Downloads/Linux_for_Tegra/source/public/kernel_src.tbz2 -C $DEVDIR/sources

After this step, your $DEVDIR/sources/ directory will contain the kernel source tree and NVIDIA driver code, ready for compilation.

Fixes

In some JetPack 5.0.2 setups, source_sync.sh may fail because the nvethernetrm repository is cloned before linux-nvidia.git, which leads to directory conflicts.

To fix this issue:

Edit source_sync.sh and move the nvethernetrm entry to appear after linux-nvidia.git:

@@ -59,9 +59,9 @@ SCRIPT_NAME=`basename $0`
 # NOTE: *Add only kernel repos here. Add new repos separately below. Keep related repos together*
 SOURCE_INFO="
 k:kernel/kernel-5.10:nv-tegra.nvidia.com/linux-5.10.git:
-k:kernel/nvidia/drivers/net/ethernet/nvidia/nvethernet/nvethernetrm:nv-tegra.nvidia.com/kernel/nvethernetrm.git:
 k:kernel/nvgpu:nv-tegra.nvidia.com/linux-nvgpu.git:
 k:kernel/nvidia:nv-tegra.nvidia.com/linux-nvidia.git:
+k:kernel/nvidia/drivers/net/ethernet/nvidia/nvethernet/nvethernetrm:nv-tegra.nvidia.com/kernel/nvethernetrm.git:

Remove the problematic directory created by the first failed attempt:
```
rm -rf $DEVDIR/sources/kernel/nvidia
```

Re-run the script:

cd $DEVDIR
./source_sync.sh -k -t jetson_35.1

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