Contents:

Part1 : Environment setup and initial build  <-- You are here
Part2 : Build u-boot using Yocto
Part3 : Build Kernel using Yocto
Part4 : Package Development using Yocto
Part5 : Application Development using ADT

 

In this blog series we will walk you through the process of getting BSP source archives, cross-compiling , generating binaries for targets , developing system packages and creating sdcard for targets  using yocto tool.

 

 

A bit on yocto:

The Yocto Project is an open source project that provides templates, tools and methods to create custom Linux-based systems for embedded products.

The framework helps in cross-compilation by providing tools and packages for the build process and generation of images for target platform.

The yocto toolset has a number of recipes and it is maintained by the Yocto community and developed by Freescale for i.MX platforms.

 

 

In this blog we will build a sdcard image for  Riotboard using available sources on Yocto project.

I am using an Ubuntu 14.04 32bit host for this activity.

 

Updating host system with  required packages to support yocto build framework.

sudo apt-get install gawk wget git-core diffstat unzip texinfo libsdl1.2-dev build-essential chrpath\

    sed wget cvs subversion git-core coreutils \

    unzip texi2html texinfo libsdl1.2-dev docbook-utils gawk \

    python-pysqlite2 diffstat help2man make gcc build-essential \

    g++ desktop-file-utils chrpath libgl1-mesa-dev libglu1-mesa-dev \

    mercurial autoconf automake groff libtool xterm curl lzop asciidoc

 

We need to have a tool to pull the packages, we are using repo here :

wget https://raw.github.com/android/tools_repo/stable/repo 

sudo mv repo /bin/repo 

sudo chmod 0755 /bin/repo

 

 

downloading yocto sources from official repository:

mkdir ~/fsl-arm-yocto-bsp

cd ~/fsl-arm-yocto-bsp

sudo repo init -u git://github.com/embest-tech/fsl-arm-yocto-bsp.git -b embest_imx-3.10.17-1.0.0_ga

repo sync

not using sudo in the above repo command will result in below error :

2uyixlf.jpg

 

 

Next we need to configure yocto to generate BSP images for Riotboard

~/fsl-arm-yocto-bsp$ MACHINE=riotboard source fsl-setup-release.sh -b build -e fb

 

A directory named build will be created inside  fsl-arm-yocto-bsp .

This contains the layers/directories used by bitbake to search for recipe while building package/image.

These recipe files can be configured (later in the blog series) according to our requirement.

 

The Riotboard config  is at : sources/meta-fsl-arm-extra/conf/machine/riotboard.conf

 

 

the local.conf in build/conf can be configured to add more libraries to image (we will see that later)

local.conf

~/fsl-arm-yocto-bsp/build$ cat conf/local.conf | grep 'MACHINE\|THREAD\|IMAGE'

MACHINE ??= 'riotboard'

EXTRA_IMAGE_FEATURES = "debug-tweaks"

BB_NUMBER_THREADS = '4'

IMAGE_INSTALL_append = " mysql5 "

 

Lets build

~/fsl-arm-yocto-bsp/build$ bitbake fsl-image-fb

 

You will get a warning like below, which can be safely ignored

8z061e.jpg

 

The build will take couple of hours ,

 

after build you will get below images in build/tmp/deploy/images/riotboard

 

Image Name

Description

u-boot.imx

bootloader

uImage

Kernel image

uImage-imx6solo_RIoTboard.dtb

Device Tree blob

fsl-image-fb-riotboard.tar.bz2

RootFileSystem

fsl-image-fb-riotboard.sdcard

Sdcard Image

 

Now the above image is ready to be flashed.

 

To flash sdcard image :

cd tmp/deploy/images/riotboard

sudo dd if=fsl-image-fb-riotboard.sdcard of=/dev/mmcblk0 bs=1M

 

make sure the boot switch is set to boot from sdcard

boot_mode1.png

 

 

For more instructions on sdcard setup, check here.

flashing sdcard image from windows, check here.