SymbiFlow examples

This repository provides example FPGA designs that can be built using the SymbiFlow open source toolchain. The examples target the Xilinx Artix-7 and the QuickLogic EOS S3 devices.

The repository includes:

• eos-s3 - Example FPGA designs for the QuickLogic EOS S3 series of parts:
  • Verilog code
  • Pin constraints files
  • Timing constraints files
  • Makefiles for running the SymbiFlow toolchain
• xc7 - Example FPGA designs for the Xilinx 7 series of parts:
  • Verilog code
  • Pin constraints files
  • Timing constraints files
  • Makefiles for running the SymbiFlow toolchain
• .travis.yml - Travis CI configuration file

Clone this repository

If you have not already done so, clone this repository and cd into it:

sudo apt install git
git clone https://github.com/SymbiFlow/symbiflow-examples.git && cd symbiflow-examples

Prerequisites

Install the following prerequisites before using symbiflow-examples:

• For Ubuntu:

apt update && apt install -y wget

• For CentOS:

yum install -y wget which

Toolchain installation

This section describes how to install the toolchain. This procedure is divided in three steps:

• Installing the Conda package manager
• Choosing an installation directory
• Downloading the architecture definitions and installing the toolchain

1. Conda

wget https://repo.continuum.io/miniconda/Miniconda3-latest-Linux-x86_64.sh -O conda_installer.sh

2. Choose the install directory

The install directory can either be in your home directory such as ~/opt/symbiflow or in a system directory such as /opt/symbiflow. If you choose a system directory, you will need root permission to perform the installation, and so you will need to add some sudo commands to the instructions below.

INSTALL_DIR=~/opt/symbiflow

3. Toolchain

• For the Artix-7 devices:

bash conda_installer.sh -b -p $INSTALL_DIR/xc7/conda
source "$INSTALL_DIR/xc7/conda/etc/profile.d/conda.sh"
conda env create -f xc7/conda_lock.yml -n xc7
conda activate xc7
mkdir -p $INSTALL_DIR/xc7/install
wget -qO- https://storage.googleapis.com/symbiflow-arch-defs/artifacts/prod/foss-fpga-tools/symbiflow-arch-defs/presubmit/install/1049/20201123-030526/symbiflow-arch-defs-install-05bd35c7.tar.xz | tar -xJC $INSTALL_DIR/xc7/install
mkdir -p $INSTALL_DIR/xc7/install/share/symbiflow/arch
wget -qO- https://storage.googleapis.com/symbiflow-arch-defs/artifacts/prod/foss-fpga-tools/symbiflow-arch-defs/presubmit/install/1049/20201123-030526/symbiflow-xc7a50t_test.tar.xz | tar -xJC $INSTALL_DIR/xc7/install/share/symbiflow/arch
wget -qO- https://storage.googleapis.com/symbiflow-arch-defs/artifacts/prod/foss-fpga-tools/symbiflow-arch-defs/presubmit/install/1049/20201123-030526/symbiflow-xc7a100t_test.tar.xz | tar -xJC $INSTALL_DIR/xc7/install/share/symbiflow/arch
conda deactivate

• For the EOS S3 devices:

bash conda_installer.sh -b -p $INSTALL_DIR/eos-s3/conda
source "$INSTALL_DIR/eos-s3/conda/etc/profile.d/conda.sh"
env PIP_NO_DEPS="true" conda env create -f eos-s3/conda_lock.yml -n eos-s3
conda activate eos-s3
wget -qO- https://quicklogic-my.sharepoint.com/:u:/p/kkumar/EWuqtXJmalROpI2L5XeewMIBRYVCY8H4yc10nlli-Xq79g?download=1 | tar -xJ -C $INSTALL_DIR/eos-s3/
conda deactivate

Build Example Designs

With the toolchain installed, you can build the example designs. The example designs are provided in separate directories:

• xc7 directory for the Artix-7 devices
• eos-s3 directory for the EOS S3 devices

Example designs for the Artix-7 devices:

Before building any example, set the installation directory to match what you set it to earlier,

export INSTALL_DIR=~/opt/symbiflow

and prepare the environment:

# adding symbiflow toolchain binaries to PATH
export PATH="$INSTALL_DIR/xc7/install/bin:$PATH"
source "$INSTALL_DIR/xc7/conda/etc/profile.d/conda.sh"
conda activate xc7

To build the counter example, run any or all of the following commands:

pushd xc7/counter_test && TARGET="arty_35" make && popd
pushd xc7/counter_test && TARGET="arty_100" make && popd
pushd xc7/counter_test && TARGET="basys3" make && popd

To build the picosoc example, run the following commands:

pushd xc7/picosoc_demo && make && popd

To build the litex example, run the following commands:

mkdir xc7/litex_demo
pushd xc7/litex_demo
wget https://raw.githubusercontent.com/enjoy-digital/litex/master/litex_setup.py
chmod +x litex_setup.py
./litex_setup.py init
./litex_setup.py install
wget https://static.dev.sifive.com/dev-tools/riscv64-unknown-elf-gcc-8.1.0-2019.01.0-x86_64-linux-ubuntu14.tar.gz
tar -xf riscv64-unknown-elf-gcc-8.1.0-2019.01.0-x86_64-linux-ubuntu14.tar.gz
export PATH=$PATH:$PWD/riscv64-unknown-elf-gcc-8.1.0-2019.01.0-x86_64-linux-ubuntu14/bin/
pushd litex/litex/boards/targets && ./arty.py --toolchain symbiflow --cpu-type vexriscv --sys-clk-freq 80e6 --no-ident-version --build && popd
popd

To build the linux-litex-demo example, run the following commands:

pushd xc7/linux_litex_demo && make && popd
pushd xc7/linux_litex_demo && TARGET="arty_100" make && popd

Example design for the EOS S3 devices:

Before building any example, set the installation directory to match what you set it to earlier,

export INSTALL_DIR=~/opt/symbiflow

and prepare the environment:

export PATH="$INSTALL_DIR/eos-s3/install/bin:$PATH"
source "$INSTALL_DIR/eos-s3/conda/etc/profile.d/conda.sh"
conda activate eos-s3

To build the example, run the following command:

pushd eos-s3/btn_counter && make && popd