From Variscite Wiki
VAR-SOM-MX6 - Yocto fsl-L3.10.17_1.0.0 Dora R5 Beta1


  • This Yocto Dora release is based on Freescale fsl-L3.10.17_1.0.0GA release.
  • Linux kernel: linux-imx_3.10.17_1.0.0_ga.
  • Uboot: u-boot-imx-2013.04.
  • Yocto Dora: Based on fsl-L3.10.17_1.0.0_iMX6qdls Freescale release (previous versions were based on the community release). Yocto Dora was re-structured as most of Variscite support code is located in meta-variscite folder.

Supported hardware and features

Board support

i.MX6 Quad
i.MX6 Dual
i.MX6 Dual lite
i.MX6 Solo

Software platform

Yocto Dora release.
Freescale release version 4.1
Meta freescale community release for Dora

Nand Recovery
NAND Flash size support
0.5,1.0,2.0,4.0 GB
DDR size support configuration
Solo:0.5,1.0 GB DualLite: 1.0GB Dual: 0.5,1.0GB Quad: 1.0,2.0 GB
10/100/1000 Mbps Ethernet
802.11 b/g/n
CAN bus
USB host
Device only. Host will be supported on next release
x3, up to 3.6 Mbps. Minicom avilable to use with the port
Display HDMI 720P,1080P LVDS0 (On board LVDS to RGB bridge, EVK supports 800x480 resolution) LVDS1 external display
Audio Line IN/ Line out
Camera ov5640 camera sensor. CB402 board can be purchased separately

Variscite Yocto Dora release 2 for Freescale i.MX6 version 4.1.

Installing required packages

Follow the link below and install all the required packages on your machine.

For example, if your building machine is an Ubuntu machine:

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

Variscite Yocto build is tested with Ubuntu 12.04 lts.

Get Yocto Dora for i.MX6 with Variscite VAR-SOM-MX6 support

Use  "repo" to fetch Yocto and apply Variscite's patches for the BSP support.

Install the `repo` utility:

$ mkdir ~/bin (this step may not be needed if the bin folder already exists)
$ curl > ~/bin/repo
$ chmod a+x ~/bin/repo
Add the following line to the .bashrc file to ensure that the ~/bin folder is in your PATH variable
$ export PATH=~/bin:$PATH
we uploaded as a reference the repo we used.

Clone Yocto Dora from github.

$ cd ~
$ mkdir var-som-mx6-dora-v5
$ cd var-som-mx6-dora-v5
$ git config --global "Your Name"
$ git config --global "Your Email"
$ repo init -u git:// -b imx-3.10.17-1.0.0_ga
$ repo sync

Download var_yocto_v5b1.tar.bz2 from Variscite's FTP.

$ tar xvf var_yocto_v5b1.tar.bz2
$ variscite/install
This method will preserve the git repositories. It will enable you to track Variscite's changes, and your own.

Setup and Customize your Yocto build

Setup the environment and use build_var folder

$ . ./setup-environment build_var
If you close your terminal and wishto build Yocto again, you should change directory to ~/var-som-mx6-dora-v3 and run the above command again. build_var is your build directory and all bitbake commands should run from it

local.conf customizations

Edit you local.conf file:

$ gedit conf/local.conf 

Change your SOM version, parallel build and download directory:

Select VAR-SOM_MX6 SOM version

One of:
MACHINE ??= 'varsomimx6q' - VAR_SOM_MX6 Quad with 1GB DDR
MACHINE ??= 'varsomimx6q2' - VAR_SOM_MX6 Quad 1.2MHz with 2GB DDR
MACHINE ??= 'varsomimx6dl' - VAR_SOM_MX6 Dual Lite with 1GB DDR
MACHINE ??= 'varsomimx6solo' - VAR_SOM_MX6 Solo with 1GB DDR or 0.5 GB DDR

Parallel build

Set the build parameters to fully utilize your host machine BB_NUMBER_THREADS = '4'
PARALLEL_MAKE = '-j 6' BB_NUMBER_THREADS should be your host machine's number of threads minus 2 or same. PARALLEL_MAKE should be the number of threads your host machine has plus two.

Download directory.

Recommended to save download time and space. DL_DIR = "/home/<uname>/yocto_dl"

Build your image

$ bitbake var-image-x11 

Other image build options:

image name
A console-only image that fully supports the target device hardware.
Image contains core-image-base plus Freescale test applications and multimedia components.
Image contains core-image-sato with Freescale test applications and multimedia with hardware accelerated X11

The resulted images are locaated in tmp/deploy/images/varsomimx6q.
Looking at tmp/deploy/images/varsomimx6q you will find 6 main files that are linked to the actual file

Image Name
How to use
Not in Use

Flash into SD-card and use boot select to boot from.

$ sudo dd if=tmp/deploy/images/varsomimx6q/var-image-x11-varsomimx6q.sdcard of=/dev/devxxx bs=1024k

Build u-boot out of tree for mmc as explained below and

$ sudo dd if=u-boot.imx of=/dev/devxxx bs=512 seek=2; sync

devxxx = mmcblk0 or sdX. Do dmesg after you insert an SD-Card into your build system to figure out the device name

Use "$ sudo gparted /dev/devxxx"
  • Lable the second partition and call it "rootfs".
  • Increase the second partition to include all avilable sd-card space.

Used to create an NFS root file system on the host.

$ sudo mkdir ../rootfs
$ sudo rm -rf ../rootfs/*
$ sudo tar xvf tmp/deploy/images/varsomimx6q/var-image-x11-varsomimx6q.tar.bz2 -C ../rootfs

See apendix for setting an NFS server


Use the sdcard created above. Copy the file into it and use the folwing commands to flash them into nand.
Coping files (mount the sd-card created above first):

$ sudo mkdir /media/rootfs/opt/images
$ sudo cp tmp/deploy/images/varsomimx6q/u-boot.imx /media/rootfs/opt/images
$ sudo cp tmp/deploy/images/varsomimx6q/uImage     /media/rootfs/opt/images
$ sudo cp tmp/deploy/images/varsomimx6q/uImage-imx6q-var-som-ldo.dtb /media/rootfs/opt/images/imx6q-var-som-ldo.dtb
$ sudo cp tmp/deploy/images/varsomimx6q/uImage-imx6q-var-som.dtb /media/rootfs/opt/images/imx6q-var-som.dtb
$ sudo cp tmp/deploy/images/varsomimx6q/uImage-imx6dl-var-som.dtb /media/rootfs/opt/images/imx6sl-var-som.dtb
$ sudo cp tmp/deploy/images/varsomimx6q/uImage-imx6sl-var-som.dtb /media/rootfs/opt/images/imx6dl-var-som.dtb
$ sudo cp tmp/deploy/images/varsomimx6q/var-image-x11-varsomimx6q.ubi /media/rootfs/opt/images
$ sudo umount /media/rootfs
$ sudo umount /media/BOT_varsomi

Flashing on target:

$ flash_eraseall /dev/mtd0
$ kobs-ng init -x /opt/images/u-boot.imx  --search_exponent=1 -v
$ nandwrite -p /dev/mtd0 -s 0x1e0000 /opt/images/imx6q-var-som.dtb 
$ flash_eraseall /dev/mtd2
$ nandwrite -p /dev/mtd2 /opt/images/uImage
$ flash_eraseall /dev/mtd3
$ ubiformat /dev/mtd3 -f /opt/images/var-image-x11-varsomimx6q.ubi -s 2048 -O 2048

Next steps

In sections 1-6 we explained how to build Yocto for VAR-SOM-MX6. We explained the results for nand (UBI) and for sd-card. At this point you should have a bootable sd-card with UBI images on it. You should be able to boot from the sd-card using the boot select button and flash the nand. Next steps:

  • Build and deploy the compiler and tools.
  • Fetch u-boot and compile it out of Yocto tools.
  • Fetch Linux kernel and compile it out of Yocto tools.


Build the toolchain by:

$ bitbake meta-ide-support
$ bitbake meta-toolchain

The output will be located at tmp/deploy/sdk/. On a 64 bit Ubuntu you will get:

Install the tools by running:

$ tmp/deploy/sdk/

The toolchain name depend on your build machine and may change.

Build U-Boot out of Yocto tree

Get sources:

$ cd ~/var-som-mx6-dora-v5
$ git clone git://
$ cd uboot-imx/
$ git checkout -b imx_v2013.04_3.10.17_1.0.0_beta_var1 remotes/origin/imx_v2013.04_3.10.17_1.0.0_beta_var1

Build u-boot:

$ export PATH=/opt/poky/1.5.1/sysroots/x86_64-pokysdk-linux/usr/bin:/opt/poky/1.5.1/sysroots/x86_64-pokysdk-linux/usr/bin/arm-poky-linux-gnueabi:$PATH
$ make -j6 ARCH=arm CROSS_COMPILE=arm-poky-linux-gnueabi- mrproper
$ make ARCH=arm CROSS_COMPILE=arm-poky-linux-gnueabi- <Your config file from the table below>
$ make -j6 ARCH=arm CROSS_COMPILE=arm-poky-linux-gnueabi-

Flash u-boot to the sd-card:

$ sudo dd if=u-boot.imx of=/dev/sdxxx bs=512 seek=2; sync

In case of UBI copy it to the sd-card:

$ sudo cp u-boot.imx /media/rootfs.opt/images

Un mount the sdcard.

$ sudo umount /dev/sdxxx
Replace /dev/sdxxx with the actual device name. Use dmesq to find the right one.

Avilable u-boot configurations

Built for
VAR-SOM-MXQ/D 1GHz CPU 1GB DDR,  boot from MMC
VAR-SOM-MXQ/D 1.2GHz CPU 2GB DDR,  boot from MMC
VAR-SOM-MXD 1GHz CPU 0.5GB DDR,  boot from MMC
VAR-SOM-MXDL, 1GHz CPU 1.0 GB DDR     boot from MMC
VAR-SOM-MXSolo, 1GHz CPU 0.5 or 1.0 GB DDR boot from MMC
VAR-SOM-MXQ/D 1.2GHz CPU 2GB DDR,  boot from NAND
VAR-SOM-MXD 1GHz CPU 0.5GB DDR,  boot from NAND
VAR-SOM-MXDL,1GHz CPU 1.0 GB DDR     boot from NAND
VAR-SOM-MXSolo, 1GHz CPU 0.5 or 1.0 GB DDR boot from NAND

Build Linux out of Yocto tree

Get sources:

$ cd ~/var-som-mx6-dora-v5/
$ git clone git://
$ cd linux-2.6-imx/
$ git checkout -b imx_3.10.17_1.0.0_ga_beta_var2 remotes/origin/imx_3.10.17_1.0.0_ga_beta_var2

Build the Linux kernel:

$ export PATH=/opt/poky/1.5.1/sysroots/x86_64-pokysdk-linux/usr/bin:/opt/poky/1.5.1/sysroots/x86_64-pokysdk-linux/usr/bin/arm-poky-linux-gnueabi:$PATH
$ make ARCH=arm CROSS_COMPILE=arm-poky-linux-gnueabi- mrproper
$ make ARCH=arm CROSS_COMPILE=arm-poky-linux-gnueabi- imx_v7_var_defconfig
$ make -j6 ARCH=arm CROSS_COMPILE=arm-poky-linux-gnueabi- uImage
$ make -j6 ARCH=arm CROSS_COMPILE=arm-poky-linux-gnueabi- modules
Build the device tree
$ make -j6 ARCH=arm CROSS_COMPILE=arm-poky-linux-gnueabi- imx6dl-var-som.dtb
$ make -j6 ARCH=arm CROSS_COMPILE=arm-poky-linux-gnueabi- imx6q-var-som.dtb
$ make -j6 ARCH=arm CROSS_COMPILE=arm-poky-linux-gnueabi- imx6q-var-som-ldo.dtb
$ make -j6 ARCH=arm CROSS_COMPILE=arm-poky-linux-gnueabi- imx6sl-var-som.dtb

Copy the uImage and device tree to the sd-card boot partition or to the opt/image in order to be flashed to the nand. Copy modules to the sd-card

$ sudo make ARCH=arm CROSS_COMPILE=arm-poky-linux-gnueabi- modules_install INSTALL_MOD_PATH=/media/rootfs/

Useful Bitbake commands

Bitbake Cheat Sheet

Useful bitbake commands

i.MX Yocto Project: ltib versus bitbake