ecp5: Don't segfault when DI port of TRELLIS_FF unconnected

YosysHQ / nextpnr

nextpnr portable FPGA place and route tool

ISC License

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ecp5: Don't segfault when DI port of TRELLIS_FF unconnected #1242

Closed laanwj closed 7 months ago

laanwj commented 7 months ago

Currently a segfault happens while packing FFs when the DI port is not specified. Leaving it unconnected is probably incorrect, but it shouldn't crash the placer. This can only happen when doing direct instantiation. Fix by adding a check.