Install software in /l4t/targetfs in JetPack Cross Compilation container

Robotics & Edge Computing Jetson & Embedded Systems Jetson AGX Orin
1

Hi,

I’ve download JetPack Cross Compilation container and extracted the rootfs in /l4t/targetfs according to the doc:

cd /l4t
cat targetfs.tbz2.* > targetfs.tbz2
tar -I lbzip2 -xf targetfs.tbz2
mkdir toolchain
tar -C toolchain -xf toolchain.tar.bz2

Now I want to install some more software in /l4t/targetfs. How can I achieve it?

Thanks!

4

Hi,

Could you share your use case?
Do you want to build a custom cross-compile environment for the desktop?
Or a custom Jetson build?

For a custom Jetson build, please check the below link for more info:
https://elinux.org/Jetson/Clone

Thanks.

5

@AastaLLL Thanks for your reply.
We want to use JetPack Cross Compilation container to develop applications. However, the rootfs /l4t/targetfs may lack of several software. So, we try to:

  1. install the software in /l4t/targetfs directly. Or
  2. make a custom rootfs by cloning the image from device and mount it in the docker.

Q1: Which is the recommended method?
Q2: I’ve tried method 2 and found the symbol links are all broken after mounted the image. So I posted another topic here.

Thanks!

6

Hi,

Sorry, we will need more info to provide further info.

Do you want a custom cross-compile environment?
Or you want to build an app for Jetson via a cross-compiling toolkit.

You don’t need to install software into the rootfs for a custom building environment.
Please create a Dockerfile using jetpack-linux-aarch64-crosscompile-x86 as the base and install the library you need.

But it doesn’t look like you want to build “applications”.
Do you want a custom Jetson build, like a custom kernel or device tree?

Thanks.

7

Hi @AastaLLL
Thanks for your reply.
We want to build Qt for Jetson via jetpack-linux-aarch64-crosscompile-x86 docker. And building Qt needs more libraries in /l4t/targetfs. These libraries can be install by running apt get install on Jetson device.
To cross compile Qt in jetpack-linux-aarch64-crosscompile-x86 docker, it seems that I need to install these libraries in /l4t/targets too. Right?
If so, how can I install them in /l4t/targetfs?

It seems that we need a custom rootfs.

Thanks!

8

I have the same question - not specifically for building qt but for other applications/libraries I intend to run on a jetson that have additional dependencies that are not in the targetfs.

For instance I need libpng.so in order to build an application. On a jetson I could get that by running
apt install libpng-dev
and that would install libpng.so to /usr/lib/aarch64-linux-gnu/

On the docker image running apt install libpng-dev installs
/usr/lib/x86_64-linux-gnu/libpng.so
which is not useful for building a aarch64 application.

Can a person update the dpkg architecure and sources in a way to get the libraries and headers needed to compile for aarch64, installed to the targetfs?

Do I need to download the debian packages and install them manually using dpkg?

9

Hi,

If you just want to cross-compile a QT app, you don’t need to add the dependencies in the /l4t/targetfs.
Instead, please install the cross-compiling libs for QT to the jetpack-linux-aarch64-crosscompile-x86 base image.

But you will need to check with the QT team to see if they provide the tool for cross-compile an ARM app.

Thanks.

10

Hi,

It looks like that you want a custom build with all dependencies pre-installed.
The simplest way is to flash a clean build and install all the dependencies you need.

Then, cloning the image for next-time flashing.
https://docs.nvidia.com/jetson/archives/r36.3/DeveloperGuide/SD/FlashingSupport.html#cloning-a-jetson-device-and-flashing

Thanks.

11

Hi @AastaLLL

Sorry, we want to cross-compile Qt for Jetson device (aarch64), not a Qt app. And to cross-compile Qt from source, we need to install some more dependencies. It’s better that these dependencies can be installed in docker image by using apt install command.

If I clone the image and mount it in docker container, the symbolic links are all broken, like this.

Thanks.

12

What I have started to do to install those dependencies to the targetfs is do a chroot /l4t/targetfs bash and then do a couple things to create a tmp and dev dir with the correct permissions and then ‘apt-get update’ and from there do ‘apt install ’ worked.

1 Like
13

Hi,

Could you share why you need the cross-compile dependencies installed in the /l4t/targetfs.

Cross-compiling is running on an x86 device so the OS is standard Ubuntu rather than L4T.
A common way is to write a custom Dockerfile and install the dependencies.

Thanks.

14

I want to build Qt with desktop-opengl/xcb supported. It needs many dependencies: libfontconfig1-dev libdbus-1-dev libfreetype6-dev libicu-dev libinput-dev libxkbcommon-dev libsqlite3-dev libssl-dev libpng-dev libjpeg-dev libglib2.0-dev libpulse-dev libasound2-dev libcups2-dev libegl1-mesa-dev libvulkan-dev libxcb1-dev libx11-xcb-dev libglu1-mesa-dev libxrender-dev libxi-dev and so on.
It’s very convenient to install these dependencies by apt install command. So if I use the method shared by @scott.pfeifer , I can install all these dependencies in /l4t/targetfs and then Qt can be built.

These dependencies should be built in aarch64 but not x64. So how can I write a custom Dockerfile and install the dependencies with aarch64 version?

Thanks.

15

Hi,

Is your issue fixed with the @scott.pfeifer suggestion?

Thanks.

16

Yes.

Thanks.

18

This topic was automatically closed 14 days after the last reply. New replies are no longer allowed.