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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.
### 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
The generic target allows running placement and routing for arbitrary custom architectures.