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knicklicht41 | Hey all and happy new year, is it possible to further refine timing optimizations when using -abc9 with synth_ecp5? | 10:20 |
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gatecat | knicklicht41: you can try the flow3 trick mentioned here: https://github.com/Ravenslofty/yosys-cookbook/blob/master/ecp5.md | 10:28 |
knicklicht41 | Thanks, I am very close to my target. Can I set the seed to the RNG somewhere so that I can try different values systematically? | 10:53 |
agg | knicklicht41: You can pass --seed to nextpnr-ecp5, I wrote a script a while back to run lots of seeds in parallel and report the best https://gist.github.com/adamgreig/b040b6e3d7a7a64f613780eae6c07930 | 12:55 |
agg | Not unusual to scrape like 10% more timing that way | 12:55 |
knicklicht41 | Thanks a lot, I will definitely check it out. | 14:47 |
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lofty | agg: for added fun, Yosys has a semi-hidden mode which can also gain depth/area sometimes | 22:05 |
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