Have I discovered a synthesis/routing defect with the Gowin IDE?

• kianRiscV

  1 492 7.8 AGS Script

  RISC-V Linux SoC, marchID: 0x2b

I encountered this issue when having difficulty porting a risc-v softcore (https://github.com/splinedrive/kianRiscV/blob/master/README.md), which works perfectly on two other hardware platforms. The linux boot process would stall about 1M instructions in. I tracked the issue down to the above issue, which differed from simulation results. Straightforward attempts to recreate the defect in a standalone environment failed. Instead I have resorted to stripping back and refactoring the failing softcore implementation layer by layer until reaching a minimal setup which still exhibits the defect. The result is the code below. The code doesn’t do anything meaningful, except exhibit the defect.

• InfluxDB

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