OpenWRT 15.05

This article illustrate how to compile and install OpenWRT on the FOX Board G20

About OpenWRT

"OpenWrt ​is a highly extensible ​GNU/​Linux ​distribution for embedded devices ​(typically wireless routers). Unlike many other distributions for these routers, OpenWrt ​is built from the ground up to be a full-featured, easily modifiable operating system for your router. In practice, this means that you can have all the features you need with none of the bloat, powered by a Linux kernel ​that's more recent than most other distributions" Read more...


  • This procedure was tested on a Linux PC with Ubuntu 15.10
  • It is advisable to have a Debug Port Interface or similar during the kernel bootstrap

Requested packages:

Install these packages on your Linux PC

~$ sudo apt-get update
~$ sudo apt-get -y install git openssl unzip
~$ sudo apt-get -y install binutils flex bison autoconf gettext texinfo
~$ sudo apt-get -y install sharutils subversion libncurses5-dev ncurses-term zlib1g-dev gawk
~$ sudo apt-get -y install build-essential
~$ sudo apt-get -y install libssl-dev

Step-by-step procedure

Clone the OpenWRT git repository:

~$ git clone git://
~$ cd openwrt

Update the software packages (feed)

~/openwrt$ ./scripts/feeds update –a
~/openwrt$ ./scripts/feeds install -a

Save this file in the openwrt directory and rename it .config:

Select your configuration

~/openwrt$ make menuconfig
~/openwrt$ make defconfig
~/openwrt$ make prereq

Configure the Linux Kernel

~/openwrt$ make kernel_menuconfig

Launch the compilation

~/openwrt$ make V=s

Copy the kernel image and the device tree blob

~/openwrt$ cd bin/at91
~/openwrt/bin/at91$ cat openwrt-at91-legacy-zImage openwrt-at91-legacy-9g20ek-oftree.dtb > /media/$USER/boot/uImage

Copy the rootfs contents

~/openwrt/bin/at91$ sudo tar -xvzpSf openwrt-at91-legacy-AT91SAM9G20EK-rootfs.tar.gz -C /media/$USER/rootfs

Unmount the microSD, insert the debug port and try. Press a key on your serial terminal to get the access to the system prompt:

BusyBox v1.23.2 (2016-03-31 20:47:06 CEST) built-in shell (ash)

  _______                     ________        __
 |       |.-----.-----.-----.|  |  |  |.----.|  |_
 |   -   ||  _  |  -__|     ||  |  |  ||   _||   _|
 |_______||   __|_____|__|__||________||__|  |____|
          |__| W I R E L E S S   F R E E D O M
 CHAOS CALMER (Chaos Calmer, r49097)
  * 1 1/2 oz Gin            Shake with a glassful
  * 1/4 oz Triple Sec       of broken ice and pour
  * 3/4 oz Lime Juice  [   45.000000] random: nonblocking pool is initialized
     unstrained into a goblet.
  * 1 1/2 oz Orange Juice
  * 1 tsp. Grenadine Syrup

Procedura rapida partendo dai file compilati

Tempo richiesto: Circa 10 minuti

Per seguire questa pocedura occorre:

  • Una microSD da almeno 1GB
  • Una macchina Linux Ubuntu con Gparted installato

Formattare la microSD con due partizzioni fat32 e ext4 come descritto in questo articolo:

Creare una directory nella vostra home directory e copiarci detro i seguenti files:

Montare la microSD quindi dare i i seguenti comandi all'interno della directory appena creata:

tar -xvjpSf boot.tar.bz2 -C /media/$USER/boot 
sudo tar -xvjpSf rootfs.tar.bz2 -C /media/$USER/rootfs 

Smontare la microSD e provare a fare il boot sulla FOX



Many thanks to Leo Guainella for his effort to find and provide this info