Monday, 2019-11-25

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pepijndevosHow can I specify top-level parameters in Yosys?11:24
pepijndevoschparam maybe? trying..11:26
daveshahyeah chparam11:29
daveshahor hierarchy -chparam11:30
pepijndevoscool11:30
pepijndevosbtw, yosys show always gives me a bunch of Cannot stat file /proc/4046/fd/29: Permission denied, is that something that's wrong on my end, or a bug?11:31
daveshahI've seen this recently too11:32
daveshahHaven't looked into it in detail11:32
daveshahSeems to be coming from fuser11:33
pepijndevosYea, it seems to work regardless, so I've been ignoring it11:33
daveshahRunning fuser on any file seems to trigger it, so I assume not a Yosys issue (I am on Arch, not sure what you are using)11:34
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pepijndevosalso arch11:38
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pepijndevosHrm, I'm trying to run synth_gowin without selecting a top module, but failing.11:51
pepijndevossynth_gowin -run coarse:11:53
pepijndevosthat should run coarse and onwards, right?11:53
pepijndevoswait, maybe I actually finally got it right11:54
ZirconiumXThat starts at coarse and then progresses11:57
ZirconiumXWhich is...not meaningfully different to the default11:57
pepijndevosexcept it skips the hierarchy command which deletes all but one module11:58
pepijndevosIs there any reason the following would not work?12:14
pepijndevoswire _TECHMAP_REMOVEINIT_Q_ = _TECHMAP_WIREINIT_Q_ === 1'b0;12:14
pepijndevosWhat I want is that if the wiri init is zero, consider it solved, else leave it and generate a warning12:15
pepijndevosouch... I know...12:17
pepijndevosit's inserting an IOB into the wire, so now the IOB output has an init set12:17
pepijndevosWell, that was not the solution either...12:30
pepijndevosah, found it12:35
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pepijndevosIs there something where you can assert that ther *should* be a warning?13:05
pepijndevosI want check -assert -noinit but I want to assert that there is in fact an unhandled init13:06
daveshahYou could use something like `select -assert-count 1 a:init`13:06
pepijndevoshmmm okay thanks13:10
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pepijndevosdaveshah, I remember we discussed some common idioms to initialise a dff, where Gowin used something else than the initial keyword13:27
pepijndevosdo you remember what it was?13:27
daveshahMust have been reg q = 1'b1;13:27
daveshahSometimes I think that's even called FPGA style initialisation for some archaic reason13:27
pepijndevosyay works13:42
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GenTooManalways use the right tool for the job (face palm) so now I can install nextpnr.17:57
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