nextpnr aims to be a vendor neutral, timing driven, FOSS FPGA place and route tool.
Currently nextpnr supports:
- Lattice iCE40 devices supported by Project IceStorm
- Lattice ECP5 devices supported by Project Trellis
- Lattice Nexus devices supported by Project Oxide
- Gowin LittleBee devices supported by Project Apicula
- NanoXplore NG-Ultra devices supported by Project Beyond
- (experimental) Cyclone V devices supported by Mistral
- (experimental) Lattice MachXO2 devices supported by Project Trellis
- (experimental) a "generic" back-end for user-defined architectures
There is some work in progress towards support for Xilinx devices but it is not upstream and not intended for end users at the present time. We hope to see more FPGA families supported in the future. We would love your help in developing this awesome new project!
A brief (academic) paper describing the Yosys+nextpnr flow can be found on arXiv.
Here is a screenshot of nextpnr for iCE40. Build instructions and getting started notes can be found below.
See also:
The following packages need to be installed for building nextpnr, independent of the selected architecture:
- CMake 3.13 or later
- Modern C++17 compiler (
clang-formatrequired for development) - Python 3.5 or later, including development libraries (
python3-devfor Ubuntu)- Python 3.9 or later is required for
nextpnr-himbaechel - on Windows make sure to install same version as supported by vcpkg
- Python 3.9 or later is required for
- Boost libraries (
libboost-dev libboost-filesystem-dev libboost-thread-dev libboost-program-options-dev libboost-iostreams-dev libboost-devorlibboost-all-devfor Ubuntu) - Eigen3 (
libeigen3-devfor Ubuntu) is required to build the analytic placer - Latest git Yosys is required to synthesise the demo design
- For building on Windows with MSVC, usage of vcpkg is advised for dependency installation.
- For 32 bit builds:
vcpkg install boost-filesystem boost-program-options boost-thread eigen3 - For 64 bit builds:
vcpkg install boost-filesystem:x64-windows boost-program-options:x64-windows boost-thread:x64-windows eigen3:x64-windows - For static builds, add
-staticto each of the package names. For example, changeeigen3:x64-windowstoeigen3:x64-windows-static - A copy of Python that matches the version in vcpkg (currently Python 3.6.4). You can download the Embeddable Zip File and extract it. You may need to extract
python36.zipwithin the embeddable zip file to a new directory called "Lib".
- For 32 bit builds:
- For building on macOS, brew utility is needed.
- Install all needed packages
brew install cmake python boost eigen
- Install all needed packages
For iCE40 support, install Project IceStorm to /usr/local or another location, which should be passed as -DICESTORM_INSTALL_PREFIX=/usr to CMake. Then build and install nextpnr-ice40 using the following commands:
cmake . -DARCH=ice40
make -j$(nproc)
sudo make install
On Windows, you may specify paths explicitly:
cmake . -DARCH=ice40 -DICESTORM_INSTALL_PREFIX=C:/ProgramData/icestorm -DCMAKE_TOOLCHAIN_FILE=C:/vcpkg/scripts/buildsystems/vcpkg.cmake -DVCPKG_TARGET_TRIPLET=x64-windows -G "Visual Studio 15 2017 Win64" -DPython3_EXECUTABLE=C:/Python364/python.exe -DPython3_LIBRARY=C:/vcpkg/packages/python3_x64-windows/lib/python36.lib -DPython3_INCLUDE_DIR=C:/vcpkg/packages/python3_x64-windows/include/python3.6 .
cmake --build . --config Release
To build a static release, change the target triplet from x64-windows to x64-windows-static and add -DBUILD_STATIC=ON.
A simple example that runs on the iCEstick dev board can be found in ice40/examples/blinky/blinky.*.
Usage example:
cd ice40/examples/blinky
yosys -p 'synth_ice40 -top blinky -json blinky.json' blinky.v # synthesize into blinky.json
nextpnr-ice40 --hx1k --json blinky.json --pcf blinky.pcf --asc blinky.asc # run place and route
icepack blinky.asc blinky.bin # generate binary bitstream file
iceprog blinky.bin # upload design to iCEstick
Running nextpnr in GUI mode (see below for instructions on building nextpnr with GUI support):
nextpnr-ice40 --json blinky.json --pcf blinky.pcf --asc blinky.asc --gui
(Use the toolbar buttons or the Python command console to perform actions such as pack, place, route, and write output files.)
For ECP5 support, install Project Trellis to /usr/local or another location, which should be passed as -DTRELLIS_INSTALL_PREFIX=/usr/local to CMake. Then build and install nextpnr-ecp5 using the following commands:
cmake . -DARCH=ecp5 -DTRELLIS_INSTALL_PREFIX=/usr/local
make -j$(nproc)
sudo make install
- Examples of the ECP5 flow for a range of boards can be found in the Project Trellis Examples.
For Nexus support, install Project Oxide to $HOME/.cargo or another location, which should be passed as -DOXIDE_INSTALL_PREFIX=$HOME/.cargo to CMake. Then build and install nextpnr-nexus using the following commands:
cmake . -DARCH=nexus -DOXIDE_INSTALL_PREFIX=$HOME/.cargo
make -j$(nproc)
sudo make install
- Examples of the Nexus flow for a range of boards can be found in the Project Oxide Examples.
Nexus support is currently experimental, and has only been tested with engineering sample silicon.
The generic target allows running placement and routing for arbitrary custom architectures.
cmake . -DARCH=generic
make -j$(nproc)
sudo make install
An example of how to use the generic flow is in generic/examples. See also the Generic Architecture docs.
The himbaechel target allows running placement and routing for larger architectures that share a common structure.
For Gowin support, install Project Apicula
cmake . -DARCH="himbaechel" -DHIMBAECHEL_GOWIN_DEVICES="all"
make -j$(nproc)
sudo make install
- Examples of the Gowin flow for a range of boards can be found in the Project Apicula Examples.
For NanoXplore NG-Ultra support, clone Project Beyond DB repo
cmake . -DARCH="himbaechel" -DHIMBAECHEL_PRJBEYOND_DB=/path/to/prjbeyond-db -DHIMBAECHEL_NGULTRA_DEVICES=ng-ultra
make -j$(nproc)
sudo make install
Please note that binary bitstream creation requires Impulse tool from NanoXplore.
The nextpnr GUI is not built by default, to reduce the number of dependencies for a standard headless build. To enable it, add -DBUILD_GUI=ON to the CMake command line and ensure that Qt5 and OpenGL are available:
- On Ubuntu 22.04 LTS, install
qtcreator qtbase5-dev qt5-qmake - On other Ubuntu versions, install
qt5-default - For MSVC vcpkg, install
qt5-base(32-bit) orqt5-base:x64-windows(64-bit) - For Homebrew, install
qt5and add qt5 in path:echo 'export PATH="/usr/local/opt/qt/bin:$PATH"' >> ~/.bash_profile` - this change is effective in next terminal session, so please re-open terminal window before building
To build nextpnr for multiple architectures at once, a semicolon-separated list can be used with -DARCH.
cmake . -DARCH="ice40;ecp5"
make -j$(nproc)
sudo make install
To build every available stable architecture, use -DARCH=all. To include experimental arches (currently nexus), use -DARCH=all+alpha.
It is possible to pre-generate chip databases (.bba files). This can come in handy when building on time-constrained cloud instances, or in situations where Python is unable to use modules. To do this, build the architecture as a standalone project, which will produce the chip database alone. For example, for iCE40:
cd ice40
cmake .
make
This will create a chipdb directory with .bba files. Provide the path to this directory when building nextpnr by using -D<arch>_CHIPDB=/path/to/chipdb.
Apart from chip databases, nextpnr requires the bba tool to be compiled for the build system. This tool can be compiled as a separate project:
cd bba
cmake .
make
This will create a bba-export.cmake file. Provide the path to this file when cross-building nextpnr by using -DBBA_IMPORT=/path/to/bba-export.cmake.
The following runs a debug build of the iCE40 architecture without GUI, without Python support, without the HeAP analytic placer and only HX1K support:
cmake . -DARCH=ice40 -DCMAKE_BUILD_TYPE=Debug -DBUILD_PYTHON=OFF -DICE40_HX1K_ONLY=1
make -j$(nproc)
To make static build release for iCE40 architecture use the following:
cmake . -DARCH=ice40 -DBUILD_PYTHON=OFF -DSTATIC_BUILD=ON
make -j$(nproc)
The HeAP placer's solver can optionally use OpenMP for a speedup on very large designs. Enable this by passing -DUSE_OPENMP=yes to cmake (compiler support may vary).
You can change the location where nextpnr will be installed (this will usually default to /usr/local) by using -DCMAKE_INSTALL_PREFIX=/install/prefix.
- All code is formatted using
clang-formataccording to the style rules in.clang-format(LLVM based with increased indent widths and brace wraps after classes). - To automatically format all source code, run
make clangformat. - See the wiki for additional documentation on the architecture API.
- To save a movie recording of place-and-route click recording icon in toolbar and select empty directory where recording files will be stored and select frames to skip.
- Manually start all PnR operations you wish
- Click on recording icon again to stop recording
- Go to directory containing files and execute
ffmpeg -f image2 -r 1 -i movie_%05d.png -c:v libx264 nextpnr.mp4
- To build test binaries as well, use
-DBUILD_TESTS=ONand aftermakerunmake testto run them, or you can run separate binaries. - To use code sanitizers use the
cmakeoptions:-DSANITIZE_ADDRESS=ON-DSANITIZE_MEMORY=ON -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++-DSANITIZE_THREAD=ON-DSANITIZE_UNDEFINED=ON
- Running valgrind example
valgrind --leak-check=yes --tool=memcheck ./nextpnr-ice40 --json ice40/blinky.json - Running tests with code coverage use
-DBUILD_TESTS=ON -DCOVERAGEand aftermakerunmake ice40-coverage - After that open
ice40-coverage/index.htmlin your browser to view the coverage report - Note that
lcovis needed in order to generate reports