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The Xilinx -7 series of FPGA is fairly well supported by SymbiFlow these days. https://symbiflow-examples.readthedocs.io/en/latest/building...

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Unless it changed recently, I think it doesn't have full support for BRAM, and no support for BSP and hard blocks, right ? I wouldn't be surprised if some were used in the Mister project. (Doesn't change the fact that Stmbiflow is an impressive feat)

I don't know the state of Xilinx family 7 open source support, other than there has been work on it for years.

A competitive chip that is well supported (including BRAM etc) is the Lattice ECP5, as found in e.g. the ULX3S dev board.

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