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Build the NVIDIA Jetson TX2 Kernel on the device itself
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README.md Update README Jul 4, 2018
copyImage.sh L4T 28.1 Release Jul 29, 2017
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makeKernel.sh Update to L4T 28.2 Mar 21, 2018
removeAllKernelSources.sh Add remove kernel sources Apr 23, 2018

README.md

buildJetsonTX2Kernel

Scripts to help build the 4.4.38 kernel and modules onboard the Jetson TX2 (L4T 28.2.1, JetPack 3.2.1). For previous versions, visit the 'tags' section.

Note: The kernel source version must match the version of firmware flashed on the Jetson. For example, the source for the 4.4.38 kernel here is matched with L4T 28.2.1. This kernel compiled using this source tree will not work with newer versions or older versions of L4T, only 28.2.1.

As of this writing, the "official" way to build the Jetson TX2 kernel is to use a cross compiler on a Linux PC. This is an alternative which builds the kernel onboard the Jetson itself. These scripts will download the kernel source to the Jetson TX2, and then compile the kernel and selected modules. The newly compiled kernel can then be installed. The kernel sources and build objects consume ~3GB.

These scripts are for building the kernel for the 64-bit L4T 28.2 (Ubuntu 16.04 based) operating system on the NVIDIA Jetson TX2. The scripts should be run directly after flashing the Jetson with L4T 28.2.1 from a host PC. There are five scripts:

getKernelSources.sh

Downloads the kernel sources for L4T from the NVIDIA website, decompresses them and opens a graphical editor on the .config file.

getKernelSourcesNoGUI.sh

Downloads the kernel sources for L4T from the NVIDIA website and decompresses them. This is useful when working through SSH, have a preference to edit the .config through a text editor or some other manner (e.g. nconfig), or have a predefined .config file you would like to substitute.

makeKernel.sh

Compiles the kernel and modules using make. The script commands make the kernel Image file, makes the module files, and installs the module files. Installing the Image file on to the system is a separate step. Note that the make is limited to the Image and modules; the rest of the kernel build (such as compiling the dts files) must be done separately. Doing "sudo make" in the kernel source directory will build the entirety.

copyImage.sh

Copies the Image file created by compiling the kernel to the /boot directory. Note that while developing you will want to be more conservative than this: You will probably want to copy the new kernel Image to a different name in the boot directory, and modify /boot/extlinux/extlinux.conf to have entry points at the old image, or the new image. This way, if things go sideways you can still boot the machine using the serial console.

removeAllKernelSources.sh Removes all of the kernel sources and compressed source files. You may want to make a backup of the files before deletion.

Notes:

Make sure to update the eMMC

The copyImage.sh script copies the Image to the current device. If you are building the kernel on an external device, for example a SSD, you will probably want to copy the Image file over to the eMMC in the eMMC's /boot directory. The Jetson will usually try to boot from the eMMC before switching to a different device. Study the boot sequence of the Jetson to properly understand which Image file is being used.

Special thanks to Raffaello Bonghi (https://github.com/rbonghi) for jetson_easy scripts. Special thanks to Shreeyak (https://github.com/Shreeyak) for discussing alternatives to get source directly from NVIDIA git repositories.

Release Notes

July, 2018

  • vL4T28.2.1
  • L4T 28.2.1 (JetPack 3.2.1)
  • Fix issue with scripts jetson_variables to determine L4T version. ** Special thanks to Shreeyak (https://github.com/Shreeyak)
  • Refactored scripts/getKernelSources and getKernelSourcesNoGUI

April, 2018

  • vL4T28.2r3
  • L4T 28.2 (JetPack 3.2)
  • Add removeAllKernelSources.sh
  • Add checks to make sure kernel version matches L4T release

April, 2018

  • vL4T28.2r2
  • L4T 28.2 (JetPack 3.2)
  • Add getKernelSourcesNoGUI.sh for cases where the user does not want to edit the .config file through a GUI.

March, 2018

  • vL4T28.2
  • L4T 28.2 (JetPack 3.2 DP)
  • Removed patches for make file cleanup

July, 2017

  • vL4T28.1
  • L4T 28.1 (JetPack 3.1)

March, 2017

  • vL4T27.1
  • L4T 27.1 (JetPack 3.0)
  • Developers Preview

License

MIT License

Copyright (c) 2017-2018 Jetsonhacks Portions Copyright (c) 2015-2018 Raffaello Bonghi (jetson_easy)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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