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| pepijndevos_ | ZirconiumX, do you think it'd work to remove pmux2shiftx and add demultiplexer chips? | 15:34 |
|---|---|---|
| pepijndevos_ | Not even sure what kind of HDL gets you a pmux, but I want it for the chip select of my SPI RAM :D | 15:36 |
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| ZirconiumX | pepijndevos_: you mean decoders | 15:48 |
| ZirconiumX | You could, but I don't know how well Yosys and ABC work with them | 15:49 |
| cr1901_modern | http://ix.io/1OuI Okay, what does this mean (other than my nextpnr is prob too old)? | 15:49 |
| ZirconiumX | Remember that ABC struggles with multiple input chips, and won't use multiple output chips | 15:49 |
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| cr1901_modern | daveshah: Did yosys/nextpnr change recently such that I could get this error? http://ix.io/1OuI | 15:59 |
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| * cr1901_modern will recompile nextpnr in a bit | 15:59 | |
| daveshah | Yeah it was the whitebox stuff in Yosys | 15:59 |
| daveshah | Needs a nextpnr update | 15:59 |
| cr1901_modern | whitebox? | 16:00 |
| cr1901_modern | and got it, I'll recompile | 16:00 |
| daveshah | Some of the SB_ cell models are now whitebox (with logic content) rather than blackbox to allow more optimisations, therefore tagged with a different attribute | 16:00 |
| cr1901_modern | oh interesting | 16:01 |
| cr1901_modern | I have a script at this point to recompile yosys and nextpnr. I do it once every 3 weeks at this point. | 16:01 |
| cr1901_modern | But I haven't deployed it on my current machine, so a mismatch happened | 16:01 |
| ZirconiumX | daveshah: is there a heuristic for when something should be whitebox versus blackbox? | 16:02 |
| daveshah | Simple combinational cells like LUTs, carry logic and muxes might as well be whitebox | 16:03 |
| ZirconiumX | Is this a Yosys or an ABC(9) thing? | 16:04 |
| emeb_mac | quick followup on some issues I posted a few days ago: was building icestorm/yosys/nextpnr on a brand new RPi4 under raspbian buster. was seeing some odd hangups in yosys-abc. Turned out to be PEBKAC - hadn't done an update of buster. After updating and rebuilding icestorm/yosys/nextpnr I'm seeing proper operation of yosys-abc. | 16:06 |
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| cr1901_modern | I wonder if whitebox means officially arachne-pnr no longer works (just curious) | 16:10 |
| daveshah | No, shouldn't affect the blif flow at all | 16:18 |
| daveshah | It's a Yosys change to support abc9 | 16:18 |
| daveshah | But will also feed into more advanced Yosys stuff in the future (indeed it was separate from the abc9 pr iirc) | 16:19 |
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