Install the Toolchain

Toolchains are a collection of tools, libraries and programs that are needed to build a system for a target. Each module will have a different toolchain as the libraries and tools that are used are often dependent on the kernel/os version. The toolchain also includes all the kernel headers that are needed to build kernel objects and libraries used to enable additional hardware on your target.

While the toolchains are target/module specific we walk through installing toolchains as well as providing best practices to manage the toolchains as they are needed to build kernel modules, applications, and the runtime environment for your target. The Legato Application Framework does not maintain any of the toolchains but does test toolchains to ensure that they work with the Application Framework.

When switching between different models of targets or upgrading your firmware/OS verify that you have the matching toolchain installed and it is the right version of toolchain that you need to build for that target.

SWI WP Series Device Toolchain

Make sure that all old toolchain installers have been archived or deleted before you download a new toolchain.

$ cd ~/Downloads
$ mkdir old_toolchains
$ mv poky* old_toolchains

Each target maintains it's own unique toolchain as the toolchain needs to be built as part of the OS distribution. Visit to download and install the toolchain for your target.

Module Download Site
WPX5XX WPX5XX Download Page
WP76XX WP76XX Firmware Download Page
AR Modules See your FAE to download and install the toolchain for your module

After downloading the toolchain installer copy it into your workspace for safe keeping:

$mv <toolchain> ~/workspace/firmware/<module>/.

You may also need to grant execute rights before the toolchain installer can be run:

$ cd ~/workspace/firmware/<module>/
$ chmod +x <toolchain>

Upon running the toolchain installer you will be prompted where you want to install the tools.


/opt/swi/y17-ext-<legato version> 

When prompted, answer "Y" to proceed with the install.

$ ./
Enter target directory for SDK (default: /opt/swi/y17-ext): /opt/swi/y17-ext-1610
You are about to install the SDK to "/opt/swi/y17-ext-1610". Proceed[Y/n]?Y
Extracting SDK...done
Setting it up...done
SDK has been successfully set up and is ready to be used.

Create a soft link from the versioned folder to /y17-ext (delete the existing soft link if needed)

$ cd /opt/swi
$ rm y-17-ext
$ ln -s y17-ext-1610 y17-ext
Each version of Legato requires its own toolchain. To support multiple versions on one host:
  • create a folder for each version
  • update the softlink "/opt/swi/y17-ext" to point to the legato version that are currently working with. To change versions update the soft link to point to the new Legato version you are working with.

Run Kernel Build Scripts

If you wish to include kernel objects within your Legato System (e.g.; the sensor you have connected to your target has it's own driver) you must run the kernel build scripts first.

Add the following directory to your PATH: /opt/swi/y17-ext/sysroots/x86_64-pokysdk-linux/usr/bin/arm-poky-linux-gnueabi

$ export PATH=/opt/swi/y17-ext/sysroots/x86_64-pokysdk-linux/usr/bin/arm-poky-linux-gnueabi:$PATH

Change directory to: /opt/swi/y17-ext/sysroots/armv7a-vfp-neon-poky-linux-gnueabi/usr/src/kernel

$ cd /opt/swi/y17-ext/sysroots/armv7a-vfp-neon-poky-linux-gnueabi/usr/src/kernel

Take ownership of the files in the directory and run make scripts, when done return ownership to the root user.

The root user does not know the path to the Legato compiler so file ownership must be temporarily transfered to yourself so that the scripts build properly and then given back when the script is completed.
$ sudo chown -R $USER .
$ ARCH=arm CROSS_COMPILE=arm-poky-linux-gnueabi- make scripts
$ sudo chown -R root .

You are now ready to build and configure the Legato Runtime Environment for your target device.

Raspberry Pi Toolchain

If you are building Legato AF directly on a Raspberry Pi then no toolchain is needed and you only need to install native GCC. If you are cross-compiling the Legato AF on a Linux machine for use on a Raspberry Pi Device, then you will need to install Raspberry Pi's toolchain.

Raspberry Pi platforms (clone from the GitHub repo):

git clone

Copy the /tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian directory to a shared location on your Linux Development Host.

Add /tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin to your $PATH

export PATH=$PATH:${PWD}/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin
The 64bit Raspberry Pi toolchain is located: /tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64

You are now ready to build and configure the Legato Runtime Environment for your target device.