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