google / google/CFU-Playground
hps_accel sometimes fails to build with Oxide
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Description
Sometimes the Oxide build fails with nextpnr failing to complete. In these cases it is stuck in "Running main router loop..." for many hours.
The attached file [hps-build.tar.gz](https://github.com/google/CFU-Playground/files/7074220/hps-build.tar.gz) contains
- json and pdc input files used to run this command:
```
nextpnr-nexus --json hps_proto2_platform.json --pdc hps_proto2_platform.pdc --fasm hps_proto2_platform.fasm --device LIFCL-17-8UWG72C --seed 1
```
- The log file `seed-1.log`, which was still running after ~10.5 hours
- The log file `seed-122.log` which is for the same command, except using `--seed 122`
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