#BuildRoot 2015.08.1 + Linux 4.2.2 on Arietta G25

BuildRoot is a set of makefiles and patches that makes it easy to generate a complete Embedded Linux System. It can generate any or all of a cross-compilation toolchain, a root filesystem, a kernel image and a bootloader image

This article explains how to create a bootable microSD for [Arietta G25](/arietta) SoM using the latest BuildRoot version and the latest stable Kernel version available now (Oct 2, 2015). ##Building procedure Download BuildRoot version 2015.08.1 from its repository: Download buildroot-2015.08.1.tar.bz2 Decompress the .bz2 file in your home directory and move inside the new directory:

~$ tar xjvf buildroot-2015.08.1.tar.bz2
~$ cd buildroot-2015.08.1
~/buildroot-2015.08.1$

Download our patch file to add the file requested by Arietta G25: Download acme.patch and apply it by typing:

~/buildroot-2015.08.1$ patch -p1 < acme.patch

Select the Arietta G25 defconfig:

~/buildroot-2015.08.1$ make arietta_defconfig

If you're running an Ubuntu distribution at 64 bit, install the libc6-i386 (sudo apt-get install libc6-i386) Install __liblz4-tool__ (sudo apt-get install liblz4-tool) used to generate the Linux Kernel zImage Save and exit from the configuration menu and launch the BuildRoot compilation. This operation will take about 1 hour to download and compile any source of any part of your Linux distribution.

~/buildroot-2015.08.1$ make
...

If everything goes well you will obtain these binary files in __output/images__ directory: * The Linux Kernel image: __zImage__ * The device tree blob file: __acme-arietta.dtb__ * The whole root file system contents: __rootfs.tar__ Insert a microSD formated in this way using gparted: * a first fat16 or fat32 partition (>6 MB) labeled __boot__ * a second ext4 partition (>32 MB) labeled __rootfs__ Copy the files generated renaming some of them in this way:

cp output/images/at91-ariettag25.dtb /media/$USER/boot/acme-arietta.dtb
cp output/images/zImage /media/$USER/boot
sudo tar xvf output/images/rootfs.tar -C /media/$USER/rootfs

Unmount the microSD and boot on your Aria. It will take about 2 minutes the first time to calculate the openssh keys. The next boots it will take just 5 secs. At login: * login: __root__ * password: __acmesystems__ ### Changing Linux Kernel configuration If you want to change something of the basic BuildRoot configuration (like adding packages) type:

~/buildroot-2015.08.1$ make menuconfig

If you want to change something in the Linux Kernel configuration (like adding some drivers) type:

~/buildroot-2015.08.1$ make linux-menuconfig

##Related links * [The BuildRoot user manual](http://buildroot.uclibc.org/downloads/manual/manual.html) * [BuildRoot web page](http://www.buildroot.net/) * [BuildRoot G+ page](https://plus.google.com/100084591154899263420/posts) * [Browseable BuildRoot repository](http://git.buildroot.net/buildroot) * [Appfruits GitHub Project - Buildroot on Acqua A5](https://github.com/appfruits/buildroot-boards)