jfpastrana/802.11p-on-arm-linux.adoc

## 802.11p-on-arm-linux.adoc

      
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              802.11p-on-arm-linux.adoc
            
          
    802.11p on HummingBoard 2 Edge using Yocto


Summary


This is the instructions for the compilation of a Linux Kernel 4.x with Yocto for a Hummingboard 2 Edge supporting 802.11p. It enables only the necessary packets for the 802.11p layer to work in the tested board.


Syncronizing and compiling the image


To get the BSP you need to have repo installed and use it as:


Install the repo utility:


$: mkdir ~/bin
$: curl http://commondatastorage.googleapis.com/git-repo-downloads/repo > ~/bin/repo
$: chmod a+x ~/bin/repo


In some Linux distributions repo is also available in the official packages repository.


Download the BSP source:


$: PATH=${PATH}:~/bin
$: mkdir gco-bsp
$: cd gco-bsp
$: repo init -u https://github.com/gcoUVa/v2x-platform.git -b sumo
$: repo sync


At the end of the commands you have every metadata you need to start work with.


To start a simple image build:


$: MACHINE=solidrun-imx6 DISTRO=poky source setup-environment build
$: bitbake core-image-v2x-dev


You can use any directory to host your build.


The source code is at sources folder.


Burning the image into a SD card


Once you have a successful compilation


$: cd tmp/deploy/images/solidrun-imx6/
$: gunzip -c core-image-v2x-dev-solidrun-imx6.wic.gz | sudo dd of=/dev/sdX bs=1M  iflag=fullblock oflag=direct conv=fsync


Downloading wireless-regdb and CRDA into the Hummingboard 2


Boot the HummingBoard from the SDcard and enable the internet connection in the board


Wireles regdb


$: git clone -b its-g5_v1 https://github.com/CTU-IIG/802.11p-wireless-regdb.git
$: scp -r 802.11p-wireless-regdb root@solidrun-imx6:/home/root
root@solidrun:~# cd 802.11p-wireless-regdb
root@solidrun:~# make
root@solidrun:~# make install


CRDA


$: git clone git://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/crda.git
$: scp -r crda root@solidrun-imx6:/home/root
root@solidrun:~# cd crda
root@solidrun:~# cp /lib/crda/pubkeys/root.key.pub.pem pubkeys #It is sometimes in /usr/lib/crda
root@solidrun:~# make
root@solidrun:~# make install


Testing 802.11p


root@solidrun:~# ip link set wlan0 down
root@solidrun:~# iw dev wlan0 interface add ocb0 type ocb
root@solidrun:~# ip link set ocb0 down
root@solidrun:~# iw reg set DE
root@solidrun:~# ip link set ocb0 up
root@solidrun:~# iw dev ocb0 ocb join 5890 10MHZ
root@solidrun:~# iw dev ocb0 info