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L4T R32.1.0 Notes
As of 13 Apr 2019, the master and warrior branches support L4T R32.1.0/JetPack 4.2 content for Jetson TX1, Jetson TX2, Jetson Nano, and Jetson AGX Xavier.
The JetPack 4.2 content cannot be downloaded anonymously from NVIDIA's servers. You must use NVIDIA SDK Manager to download the JetPack 4.2 Debian packages to your build host, then add this setting to your build configuration (e.g., in conf/local.conf under your build directory):
NVIDIA_DEVNET_MIRROR = "file://path/to/downloads"
By default, the SDK Manager downloads to a directory called Downloads/nvidia/sdkm_downloads under your $HOME directory, so use that path in the above setting.
The L4T BSP files (driver package, sources for gstreamer plugins, etc.) are accessible without a DevNet account, so if your builds only require the BSP, you don't have to go through these extra steps.
NVIDIA does not support Jetson TX1 with L4T R32.1.0, but it does appear to work with this version of the BSP. For production use of Jetson TX1, you should stick with L4T R28.x BSP releases.