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README: document PREGENERATED_BBA_PATH

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Signed-off-by: Sean Cross <sean@xobs.io>
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Sean Cross 2019-09-17 11:33:39 +08:00
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README.md
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@ -155,6 +155,10 @@ The HeAP placer's solver can optionally use OpenMP for a speedup on very large d
You can change the location where nextpnr will be installed (this will usually default to `/usr/local`) by using
`-DCMAKE_INSTALL_PREFIX=/install/prefix`.
It is possible to pre-generate `.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, specify the path to pre-
generated `.bba` files by passing `-DPREGENERATED_BBA_PATH=` to cmake.
Notes for developers
--------------------