Helps bake system images for NVIDIA Tegra
Is a collection of scripts intended to help you build system images for Nvidia Jetson with:
- customized kernels, using menuconfig
- rootfs customization support (install and remove packages)
Tegrity currently only supports Jetson Nano Development version, but support is planned for other boards, starting with Xavier.
Tegrity requires that you have SDK manager installed and have downloaded the bundle for your Tegra development platform. If you have run SDK manager to flash your platform, chances are you've done this.
To install or upgrade, obtain the files using git directly or from a release zip.
(cd into tegrity folder) sudo ./install.py
To uninstall, run
sudo install.py --uninstall
Tegrity is available on pypi as a placeholder, however it's not recommended to rely on pypi since at the time of writing pypi does not enforce MFA to upload packages. Also, a simple misspelling might result in malware being installed.
To build a system image:
The main script is 'tegrity' and runs all the others with appropriate options.
$ tegrity --help usage: tegrity [-h] [--cross-prefix CROSS_PREFIX] [--firstboot FIRSTBOOT [FIRSTBOOT ...]] [--public-sources PUBLIC_SOURCES] [--public-sources-sha512 PUBLIC_SOURCES_SHA512] [--build-kernel] [--kernel-load-config KERNEL_LOAD_CONFIG] [--kernel-save-config KERNEL_SAVE_CONFIG] [--kernel-localversion KERNEL_LOCALVERSION] [--kernel-menuconfig] [--rootfs-source ROOTFS_SOURCE] [--rootfs-source-sha512 ROOTFS_SOURCE_SHA512] [-o OUT] [-l LOG_FILE] [-v] l4t_path Helps bake Tegra OS images. positional arguments: l4t_path path to desired Linux_for_Tegra path. optional arguments: -h, --help show this help message and exit --cross-prefix CROSS_PREFIX the default cross prefix (default: /usr/local/bin/aarch64-linux-gnu-) --firstboot FIRSTBOOT [FIRSTBOOT ...] list of first boot scripts to install (default: None) --public-sources PUBLIC_SOURCES url or local path to a public sources tarball. (default: https://developer.nvidia.com/embedded/dlc/r3 2-3-1_Release_v1.0/Sources/T210/public_sources.tbz2) --public-sources-sha512 PUBLIC_SOURCES_SHA512 public sources sha512 expected (default: f9729758ff44f 9b18ec78a3e99634a8cac1ca165f40cda825bc18f6fdd0b088baac 5a5c0868167a420993b3a7aed78bc9a43ecd7dc5bba2c75ca20c66 35573a6) --build-kernel builds the kernel (default: False) --kernel-load-config KERNEL_LOAD_CONFIG loads kernel configuration from this file (default: None) --kernel-save-config KERNEL_SAVE_CONFIG save kernel configuration to this file (default: None) --kernel-localversion KERNEL_LOCALVERSION local version string for kernel (default: -tegrity) --kernel-menuconfig interactively configure kernel (default: False) --rootfs-source ROOTFS_SOURCE url or local path to rootfs tarball / directory, specify "l4t" to download a new default rootfs, or "ubuntu_base" to get an Ubuntu Base rootfs. (default: None) --rootfs-source-sha512 ROOTFS_SOURCE_SHA512 sha512sum of rootfs tarball (default: None) -o OUT, --out OUT the out path (for sd card image, etc) (default: None) -l LOG_FILE, --log-file LOG_FILE where to store log file (default: /home/mdegans/.tegrity/tegrity.log) -v, --verbose prints DEBUG log level (logged anyway in --log-file) (default: False)
To build your system step by step, for more control, you may choose instead to run individual scripts in order:
tegrity-toolchain- to install or update a toolchain
tegrity-kernel- to build a kernel
tegrity-rootfs- to download or setup a new rootfs
tegrity-qemu- to run scripts on a rootfs or enter it interactively
tegrity-image- to build the final image (currently only creates sd card for Jetson Nano Development)
each of these scripts have their own
Tegrity also installs a system python package,
tegrity, allowing you to create
your own scripts with the same building blocks, however it's not recommended
to do this currently since the API is in shift. However
will probably not change much and some may find it very useful in it's current
import tegrity rootfs = '/path/to/a/rootfs' script = '/path/to/a/script.sh' with tegrity.qemu.QemuRunner(rootfs) as runner: # the same exact interface as subprocess.run: runner.run_cmd(('apt', 'update')) # the userspec parameter can be used to set a user (passed to chroot) runner.run_cmd(('vi', '/home/marco/.bashrc'), userspec="marco:marco") # .run_script can be used to copy a script to a rootfs and run it # (with options), deleting it afterward (untested): runner.run_script(script, '-o', 'output.whatever')
Since QemuRunner is a context manager, it will automatically mount the necessary special filesystems, bind mount or copy qemu-aarch64-static as appropriate, and no matter what happens, unmount the special filesystems in reverse order and clean up on leaving the context.
Additional options for QemuRunner construction are available (eg. additional mounts, overriding mounts, override qemu binary location, etc). It's recommended for now to read the relavent portions of qemu.py
Download the file for your platform. If you're not sure which to choose, learn more about installing packages.
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