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{{AppliesToSBCLynx}}
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{{WarningMessage|text=This application note was validated against specific versions of the kit only. It may not work with other versions. Supported versions are listed in the ''History'' section.}}
== History ==
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==Introduction==
By default, [[AXEL_ULite_and_SBC_Lynx_Embedded_Linux_Kit_(XUELK)|'''AXEL ULite and SBC Lynx Embedded Linux Kit (XUELK)''']] comes with a Yocto distribution. Nevertheless, other distributions can be used as well. This application note shows how to run one of them, [https://buildroot.org buildrootBuildroot].
The test bed used for this application note is composed of the same hardware/software platform delivered along with the XUELK. About buildrootBuildroot, the version 2016.11.2 was used.
==Donwloading, configuring and building buildroot==This process is straightforward. Once the file [https://buildroot.org/downloads/buildroot-2016.11.2.tar.gz <code>buildroot-2016.11.2.tar.gz</code>] is downloaded and decompressed on your Linux host machine, get into the buildroot Buildroot directory, and run <code>make menuconfig</code>.
Then enter the <code>Target options</code> menu and select:
*<code>ARM (little endian)</code> for <code>Target Architecture</code>
*<code>cortex-A7</code> for <code>Target Architecture Variant</code>
[[File:Buildroot-cortex-A7.png|thumb|center|600px|]]
That's it: after saving your configuration, and exiting <code>menuconfig</code> , you can start the build process, by simply issuing the <code>make</code> command.
==Mounting buildroot the Buildroot file system on the target==
Once the build process is completed, in the <code>output/images</code> subdirectory the file <code>rootfs.tar</code> is available. This file contains the root file system for the target.
In this example, this file is was untarred on a NFS server, in order to mount it via NFS protocol by the target. The following dump shows the serial console messages, printed out by the target during the boot process:
<pre class="mw-collapsible mw-collapsed">
Swap: 0 0 0
</pre>
In real world applications, additional packages are usually added by selecting them under the <code>Target packages</code> item of the configuration menu. Just look at the <code>packages</code> directory to see which ones are available out of the box. To add further packages, please refer to [https://buildroot.org/downloads/manual/manual.html#adding-packages this link].
