Boot2Qt is a special meta repository for Yocto project supporting by The Qt company. The open source version is available since Qt 5.7 was released and can be found at:
https://code.qt.io/cgit/yocto/meta-boot2qt.git/
In this small article I will show how to build a SD image for Raspberry Pi on Ubuntu 18.04 in several simple steps.
1. Install the dependencies for the Yocto tools. In Ubuntu, the following packages are required:
$ sudo apt-get install gawk curl git-core git-lfs diffstat unzip p7zip-full textinfo \
gcc-multilib build-essential chrpath libstdl1.2-dev xterm gperf bison g++-multilib
2. Go to your home directory
$ cd /home/your_home_dir
3. Clone an open source branch of meta-boot2qt project:
$ git clone git://code.qt.io/yocto/meta-boot2qt.git meta-boot2qt.rpi3
4. Checkout the required tag version
$ cd /home/your_home_dir/meta-boot2qt.rpi3
Get a list of the tags
$ git tag
Choose a version 5.12.3
$ git checkout tags/v5.12.3 -b v5.12.3
5. Create a build directory:
$ mkdir /home/your_home_dir/build.rpi3
$ cd /home/your_home_dir/build.rpi3
6. Initialize the Yocto repositories for chosen device (rasberrypi3):
$ ../meta-boot2qt.rpi3/b2qt-init-build-env init –device raspberrypi3
7. At this point, we have everything we need to start a build.
export global “MACHINE” variable
$ export MACHINE=raspberrypi3
and create build configuration
$ source ./setup-environment.sh
8. Yocto recipes for Boot to Qt for embedded Linux have two main targets to build: the target image, and the external toolchain that can be used with Qt Creator for building Qt applications.
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$ bitbake b2qt-embedded-qt5-image
$ bitbake meta-toolchain-b2qt-embedded-qt5-sdk
You will find your SD card image “b2qt-embedded-qt5-image-raspberrypi3-yyyymmddhhmmss.rootfs.rpi-sdimg” in directory
/home/your_home_dir/build.rpi3/build-raspberrypi3/tmp/deploy/images/raspberrypi3/
and SDK self-extracted archive “b2qt-x86_64-meta-toolchain-b2qt-embedded-qt5-sdk-raspberrypi3.sh” in directory
/home/your_home_dir/build-raspberrypi3/tmp/deploy/sdk
Note: the part of image name “yyyymmddhhmmss” contains time stamp of creating the image. For example, I have “b2qt-embedded-qt5-image-raspberrypi3-20190515124717.rootfs.rpi-sdimg” file.
Flashing an image to SD card
Before flashing the image, from the command line call “lsblk” command. Note down the available devices. Now insert your SD card into your computer and call “lsblk” command again. We will use new device as output later. To flash the image to SD card I use “dd” command:
$sudo dd bs=1M if=b2qt-embedded-qt5-image-raspberrypi3-yyyymmddhhmmss.rootfs.rpi-sdimg of=/dev/sdd status=progress
Make sure you use the right output device. In my example, it is /dev /sdd.
Booting the image
On boot, qtlauncher service starts an official Qt demo application (see a picture below)
You can communicate with the board either via ssh (root@IP.Address) or by using a serial console. In case of the last option you need to append to “/boot/config.txt” file the next row:
enable_uart=1
References:
1. Qt 5.7 for Device Creation
https://blog.qt.io/blog/2016/06/16/qt-5-7-for-device-creation/
2. Building Your Own Embedded Linux Image
http://doc.qt.io/QtForDeviceCreation/qtee-custom-embedded-linux-image.html