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| Zevv | hi all; is there a way to make yosys accept/ignore my $display()s that i use for simulation so I can just keep those in? | 16:48 |
|---|---|---|
| tnt | Zevv: yosys should be fine with those ... | 16:48 |
| Zevv | well, nextpnr then :) | 16:49 |
| tnt | nextpnr will not even see them | 16:50 |
| tnt | (they're not present in yosys' output ...) | 16:50 |
| Zevv | ERROR: cell type '$print' is unsupported (instantiated as 'machine.cpu0.rd_en_SB_DFFE_Q_E_SB_LUT4_O_I1_SB_LUT4_O_I2_SB_LUT4_I3_O_$print_EN') | 16:51 |
| Zevv | that is what I end up with | 16:51 |
| Zevv | that's nextpnr complaining | 16:53 |
| lofty | Zevv: yeah, that's twice this has been reported | 16:55 |
| lofty | though since you mention just using them for simulation, can you wrap them in `ifndef SYNTHESIS/`endif ? | 16:55 |
| Zevv | I can, but they're all over the place | 16:56 |
| lofty | I have a hackier solution, although this is what you "should" be doing :p | 16:56 |
| Zevv | I grep them out before synthesizing but that's silly of course | 16:56 |
| tnt | Huh ... I could swear this used to work just fine. I have $display in code I've ran through yosys/nextpnr. | 16:56 |
| lofty | tnt: yes, it *used to* work just fine | 16:56 |
| lofty | then https://github.com/YosysHQ/yosys/pull/4129 arrived and caused these cells to leak through | 16:57 |
| tnt | -_- | 16:57 |
| lofty | anyway. | 16:57 |
| Zevv | what's your hacky solution. | 16:57 |
| Zevv | module $display(...) ... endmodule ? | 16:58 |
| lofty | Zevv: I suppose you're using a `-json` argument to a synthesis script, right? | 16:58 |
| lofty | no :p | 16:58 |
| Zevv | yes | 16:58 |
| Zevv | YOSYSCMD := synth_ice40 -top top -json $(NAME).json -noflatten | 16:58 |
| lofty | if you have -json at the very end of your script arguments, then: s/-json/; delete t:$print; write_json/ | 16:58 |
| Zevv | whoah | 16:59 |
| lofty | I would very much not use -noflatten :p | 16:59 |
| Zevv | yeah that's left there for reasons of inspection | 16:59 |
| lofty | <lofty> if you have -json at the very end of your script arguments, then: s/-json/; delete t:$print;;; write_json/ <-- or this | 16:59 |
| lofty | (fun fact: yosys has load-bearing semicolons) | 17:00 |
| Zevv | well, that should do the job as well, thanks | 17:01 |
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