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Update README to add section for mistral (cyclonev) backend

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Robert Ward 2025-11-27 07:58:00 +00:00
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README.md
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@ -129,6 +129,19 @@ sudo make install
Nexus support is currently experimental, and has only been tested with engineering sample silicon. Nexus support is currently experimental, and has only been tested with engineering sample silicon.
### nextpnr-mistral
For Cyclone V support, clone [Mistral](https://github.com/Ravenslofty/mistral/tree/nextpnr-latest) to `$HOME/mistral` or another location and pass this path as `-DMISTRAL_ROOT=$HOME/mistral` to CMake. Then build and install `nextpnr-mistral` using the following commands:
```
mkdir -p build && cd build
cmake .. -DARCH=mistral -DMISTRAL_ROOT=$HOME/mistral
make -j$(nproc)
sudo make install
```
Cyclone V support is currently experimental and has limited testing. The backend is undergoing active API refactoring, and its structure, build requirements, and integration points may change between versions.
### nextpnr-generic ### nextpnr-generic
The generic target allows running placement and routing for arbitrary custom architectures. The generic target allows running placement and routing for arbitrary custom architectures.