Building the Filesystem¶

1. Prerequisites 2. Building the FPGA Image 3. Building the Bootloader 4. Building the Filesystem 5. Building the SD Card

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• Table of contents
• Building the Filesystem
  • Introduction
    • Repository
    • Development Kit Pre-built Outputs
  • Setting up the Build Environment
  • Setting up Yocto
  • Performing the Yocto Build
    • Outputs
  • Build the SDK
    • Outputs
  • Further Reading

Introduction¶

If you are interested in building / maintaining your own Linux distribution from source for the MitySOM-A10S family, there is a Yocto compatible meta layer for the module provided at our git-web viewer: gitweb

The current branch of the Critical Link SOCFPGA is: zeus.
The recommend Operating System for the build machine: Ubuntu 18.04

Repository¶

Description	Repository	Branch	Web Viewer
Critical Link MitySOM-A10S/MitySOM-5CSx meta layer	git://support.criticallink.com/home/git/meta-cl-socfpga.git	zeus	gitweb

Development Kit Pre-built Outputs¶

Description	Link
Development Kit Filesystem Archive	mitysom-image-base-mitysom-a10s.tar.gz
Development Kit Filesystem SDK	poky-glibc-x86_64-mitysom-image-base-cortexa9hf-neon-mitysom-a10s-toolchain-3.0.4.sh
Development Kit Filesystem Sources	Please contact Critical Link
Development Kit Filesystem Licenses	Please contact Critical Link

Setting up the Build Environment¶

In order to build the filesystem is recommended to use Ubuntu 18.04 LTS with the following packages installed:

sudo apt-get install gawk wget git-core diffstat unzip texinfo gcc-multilib build-essential chrpath socat libsdl1.2-dev python curl libssl-dev bc python3 tig libncurses5-dev libncursesw5-dev

The actual build is executed within a preset docker container. You need to install the docker software package as outlined in the Docker Installation Guide on the docker website. Once you have docker installed, you need to fetch the docker container used for the build:

docker pull crops/poky:ubuntu-18.04

Setting up Yocto¶

Yocto is made up of multiple meta layers, these layers are stored in git repositories. To get everything set up to build, these repositories will need to be cloned and a few config files will need to be copied over.

1. Open a terminal
2. Clone all the needed repositories
   

   git clone -b zeus git://git.yoctoproject.org/poky
   cd poky
   git clone -b zeus git://git.openembedded.org/meta-openembedded
   git clone -b zeus git://support.criticallink.com/home/git/meta-cl-socfpga.git
   

3. Launch the docker container interactively:
   

   docker run --rm -it -v `pwd`:/work --workdir=/work --tmpfs /opt/poky crops/poky:ubuntu-18.04 /bin/bash
   

4. You should be inside a bash shell of the docker contain. Source the yocto environment
   

   . ./oe-init-build-env
   

5. Copy the Critical Link's Example configuration files into the build/conf
   

   cp ../meta-cl-socfpga/conf/bblayers.conf.sample conf/bblayers.conf
   cp ../meta-cl-socfpga/conf/local.conf.a10 conf/local.conf
   

Performing the Yocto Build¶

The following steps will build the filesystem that is used on the Critical Link MitySOM-A10S development kit.

1. Stay inside the docker container from the previous step, or if you have exited relaunch the container in the poky folder:
   

   docker run --rm -it -v `pwd`:/work --workdir=/work --tmpfs /opt/poky crops/poky:ubuntu-18.04 /bin/bash
   

2. Source the yocto environment
   

   . ./oe-init-build-env
   

3. Build the filesystem
   

   bitbake mitysom-image-base
   

Outputs¶

Description	Location
Filesystem Tarball	<Yocto Directory>/build/tmp/deploy/images/mitysom-a10s/mitysom-image-base-mitysom-a10s.tar.gz

Build the SDK¶

The following steps will build the SDK with the cross-compiler toolchain that is used on the Critical Link MitySOM-A10S development kit.

1. Stay inside the docker container from the previous step, or if you have exited relaunch the container in the poky folder:
   

   docker run --rm -it -v `pwd`:/work --workdir=/work --tmpfs /opt/poky crops/poky:ubuntu-18.04 /bin/bash
   

2. Source the yocto environment
   

   . ./oe-init-build-env
   

3. Build the filesystem
   

   bitbake mitysom-image-base -c populate_sdk
   

Outputs¶

Description	Location
Filesystem Tarball	<Yocto Directory>/build/tmp/deploy/sdk/poky-glibc-x86_64-mitysom-image-base-cortexa9hf-neon-toolchain-2.4.3.sh

Further Reading¶

• Critical Link's web git browser
• Yocto Manual

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1. Prerequisites 2. Building the FPGA Image 3. Building the Bootloader 4. Building the Filesystem 5. Building the SD Card