Open main menu

DAVE Developer's Wiki β

Building the Yocto BSP (XUELK)

Info Box
AXEL ULite-top.png Applies to AXEL ULite
SBC Lynx-top.png Applies to SBC Lynx
Yocto-logo.png Applies to Yocto

200px-Emblem-important.svg.png As the XELK kit is based on Yocto, the implementation of the MVM follows the approach described here. As such, the reading of this section is highly recommended. 200px-Emblem-important.svg.png



Version Date XUELK version Notes


December 2016 XUELK 1.1.0


May 2017 XUELK 1.2.0
2.0.0 Sep 2017 XUELK 2.0.0

Quick referenceEdit

Repository Information
Repository BSP Manifest Yocto BSP Layer
stable branch lynx-krogoth lynx-krogoth
stable tag xuelk-2.0.2 xuelk-2.0.2
Build targets
Name Description
lynx-image-qt5 QT5.x support
lynx-image-devel minimal for development/debugging image
lynx-image-networking based on lynx-image-devel plus networking tools
lynx-image-core minimal working image with SSH
lynx-image-gui based on lynx-image-core with additional tools to support the graphical environment


This is a quickstart guide to build Yocto BSP for Axel ULite SOM and SBC Lynx, to rebuild the binaries (u-boot, linux kernel, root file system) provided with XUELK releases.

For more information regarding Yocto build system, go to its dedicated category page

Build System prerequisitesEdit

XUELK MVM is already configured to build this Yocto version/configuration, however, users typically don't use a VirtualBox VM for Yocto builds for performance reasons.

You can refer to Yocto manual setup section for a list of supported Linux distribution and their configuration to create your own build environment on your favorite distribution.

Build the XUELK Yocto BSPEdit

Initialize the build environmentEdit

XUELK Yocto BSP uses git-repo tool to fetch all the required git repositories to build

dvdk@dvdk-vm:~/lynx$ curl > repo
dvdk@dvdk-vm:~/lynx$ chmod a+x repo
dvdk@dvdk-vm:~/lynx$ ./repo init -u -b lynx-krogoth
dvdk@dvdk-vm:~/lynx$ ./repo sync

Build the Yocto BSP imageEdit

Please note that even the basic root file system requires a few hours to build on a mid/hi range desktop (4-6 cores, 8-12 GiB RAM) also depending on your Internet connection speed (all sources are fetched from the network). Nearly 20GiB of disk space is required for the build. Moreover, building inside the DVDK adds some overhead, since the performances of a virtual machine are reduced if compared to the physical hardware. Thus, it's recommended to check the hardware capabilities of the host system and, when building with Yocto is required, developers should consider the following options:

  • migrating the build system to a physical machine
  • assuming that the host system has the required resources, extending the hardware capabilities of the default DVDK (eg: adding more cores and disk space)

Once completed the initialization phase, developers can launch the Yocto image build process with the following commands:

dvdk@dvdk-vm:~/lynx$ DISTRO=fsl-imx-fb MACHINE=sbc-lynx source -b build
dvdk@dvdk-vm:~/lynx/build$ bitbake lynx-image-networking

The resulting files (kernel, devicetree and u-boot binaries, plus .tar.gz root file system) will then be available inside build/tmp/deploy/images/sbc-lynx.

Generating the SDKsEdit

After creating an image as described above, the corresponding SDK can be generated by issuing the following command:

bitbake <target-image-name> -c populate-sdk

Again, replace <target-image-name> with one of the images listed in here.

Build additional packagesEdit

To build additional packages the user must first enter the directory where the is placed and source it

dvdk@dvdk-vm:~/lynx$ DISTRO=fsl-imx-fb MACHINE=sbc-lynx source -b build

And then he can run any of the bitbake commands.

dvdk@dvdk-vm:~/lynx/build$ bitbake memtester

The resulting packages (the default format is ipk) can be found inside build/tmp/deploy/rpm.

dvdk@dvdk-vm:~/lynx/build$ ls -l tmp/deploy/rpm/cortexa7hf_vfp_neon/memtester*
-rw-r--r-- 1 dvdk dvdk  9967 Sep  7 05:43 tmp/deploy/rpm/cortexa7hf_vfp_neon/memtester-4.1.3-r0.cortexa7hf_vfp_neon.rpm
-rw-r--r-- 1 dvdk dvdk 25544 Sep  7 05:43 tmp/deploy/rpm/cortexa7hf_vfp_neon/memtester-dbg-4.1.3-r0.cortexa7hf_vfp_neon.rpm
-rw-r--r-- 1 dvdk dvdk  2884 Sep  7 05:42 tmp/deploy/rpm/cortexa7hf_vfp_neon/memtester-dev-4.1.3-r0.cortexa7hf_vfp_neon.rpm
-rw-r--r-- 1 dvdk dvdk  5611 Sep  7 05:44 tmp/deploy/rpm/cortexa7hf_vfp_neon/memtester-doc-4.1.3-r0.cortexa7hf_vfp_neon.rpm