meta-somlabs-bsp

Basic SoMLabs Yocto meta-layer - intended to be easy to use as VisionSOM-6ULL projects base

Layer Features:

• Somlabs U-Boot bootloader support with SD/NAND/EMMC auto recognition, USB flashing mode and custom splash screen
• U-Boot fw-utils support
• Linux-imx kernel from meta-freescale
• Kernel device-tree structure prepared to be easily inherited by another layers(SOM module/Carrier board levels)
• Murata 1DX Wifi and Bluetooth module support Out-of-Box
• QT5 support with evdev/tslib touch panel/keyboard + gstreamer backend for qtmultimedia
• SOMLabs SL-TFT7-TP-800-480-P LCD+Touch panel support
• PXP support for gstreamer hardware acceleration
• gstreamer PXP plugins support
• Proper sleep/wakeup support

Demo Layer available here: https://github.com/QB4-dev/meta-somlabs-demo

Build Instructions

Tools

On fresh Linux OS installation use this command to install tools needed by Yocto:

sudo apt-get install gawk wget git-core diffstat unzip texinfo gcc-multilib \
build-essential chrpath socat cpio python3 python3-pip python3-pexpect \
xz-utils debianutils iputils-ping python3-git python3-jinja2 libegl1-mesa libsdl1.2-dev \
pylint3 xterm

more info...

Bulid environment

Open terminal window and run following commands:

• create directories

mkdir visionsom_build
mkdir yocto-layers
cd yocto-layers

• download poky - reference Yocto Linux Distribution

git clone -b dunfell git://git.yoctoproject.org/poky.git poky

• download essential layers

git clone -b dunfell git://git.openembedded.org/meta-openembedded
git clone -b dunfell https://github.com/Freescale/meta-freescale.git
git clone -b dunfell https://github.com/QB4-dev/meta-somlabs-bsp

Init bulid environment

cd ..
source ./yocto-layers/poky/oe-init-build-env visionsom_build

Bulid configuration

local.conf

Edit yocto/visionsom_build/conf/local.conf file, You can use /conf/local.conf.sample from meta-somlabs-bsp layer as a template

• select proper machine: MACHINE ??= "visionsom6ull-wifi-cb-std" and DISTRO DISTRO ?= "poky"

You can choose between VisionSOM6ULL with or without WiFi module on VisionCB-STD form machine configs defined here: https://github.com/QB4-dev/meta-somlabs-bsp/tree/master/conf/machine

bblayers.conf

Edit yocto/visionsom_build/conf/bblayers.conf file, You can use /conf/bblayers.conf.sample from meta-somlabs-bsp layer as a template

Recommended layers list:

YOCTO_ROOT = "${@os.path.abspath(os.path.join("${TOPDIR}", os.pardir))}"

BBLAYERS ?= " \
  ${YOCTO_ROOT}/yocto-layers/poky/meta \
  ${YOCTO_ROOT}/yocto-layers/poky/meta-poky \
  ${YOCTO_ROOT}/yocto-layers/meta-openembedded/meta-oe \
  ${YOCTO_ROOT}/yocto-layers/meta-openembedded/meta-networking \
  ${YOCTO_ROOT}/yocto-layers/meta-openembedded/meta-python \
  ${YOCTO_ROOT}/yocto-layers/meta-freescale \
  ${YOCTO_ROOT}/yocto-layers/meta-somlabs-bsp \
  "

Build process

Go back to visionsom_build directory and run:

bitbake core-image-minimal

First build will take a few hours depending on your host PC hardware

Flashing Linux image

To flash complete image onto SD card go to visionsom_build/tmp/deploy/images/visionsom6ull-wifi-cb-std insert your SD card and find card id using lsblk or dmesg cmd:

sda           8:0    0 465,8G  0 disk 
├─sda3        8:3    0   9,7G  0 part [SWAP]
├─sda4        8:4    0  60,4G  0 part /media/projects
└─sda7        8:7    0 113,4G  0 part /mnt/yocto
sdb           8:16   0 119,2G  0 disk 
├─sdb1        8:17   0  55,9G  0 part /
└─sdb2        8:18   0  55,9G  0 part /home
mmcblk0     179:0    0   1,9G  0 disk 
└─mmcblk0p1 179:1    0 269,7M  0 part /media/mmc

In this example our sd card has been recognized as /dev/mmcblk0

NOTE: Double-check sd card identifier, wrong identifier can damage data on your host drive!!!

Flash image using gunzip and dd tools:

gunzip -c core-image-minimal-visionsom6ull-wifi-cb-std.wic.gz | sudo dd of=/dev/mmcblk0 bs=1M iflag=fullblock oflag=direct conv=fsync status=progress

Insert card inside Your board and connect power supply

For EMMC/NAND board versions refer to:

https://wiki.somlabs.com/index.php/How_to_write_image_to_VisionSOM-6ULL_eMMC_on_Windows_and_Linux https://wiki.somlabs.com/index.php/How_to_write_image_to_VisionSOM-6ULL_NAND_memory_using_UUU_tool_on_Linux

Happy coding