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| cr1901_modern | ZipCPU: Path bug == "yosys-config returns the wrong directory on Windows." But I need to test something before actually submitting a report | 01:26 |
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| cr1901_modern | it's possible I forgot to run "make PREFIX=/path/to/root" while compiling | 01:26 |
| ZipCPU | I just ask because Clifford and I were chasing some path bugs today. | 01:26 |
| ZipCPU | I wasn't using Windows though | 01:26 |
| * cr1901_modern goes ahead and checks | 01:27 | |
| ZipCPU | We were looking into include paths | 01:27 |
| ZipCPU | I was surprised to discover that yosys allows code in multiple directories, and include paths between them | 01:27 |
| cr1901_modern | Why wouldn't it? | 01:28 |
| ZipCPU | Exactly ... I just hadn't used that feature before. | 01:28 |
| ZipCPU | Well, that and .... there were some bugs when using the feature with Verific ... initially, as I recall, there was no way to create new paths. Then once we fixed that, everytime you specified an include path it would get reset after a single read command. | 01:29 |
| ZipCPU | But ... that was just my morning's work ;) | 01:29 |
| cr1901_modern | include paths are broken on ISE too if memory serves. I.e. you can only add one | 01:29 |
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| ZipCPU | Hmm ... I didn't check more than one | 01:30 |
| cr1901_modern | https://github.com/YosysHQ/yosys/blob/master/Makefile#L487 (Why don't ppl use m4 for this?) | 01:32 |
| tpb | Title: yosys/Makefile at master · YosysHQ/yosys · GitHub (at github.com) | 01:32 |
| cr1901_modern | Yea in any case, it's my fault for not running w/ "make PREFIX=" | 01:33 |
| * ZipCPU pulls up the link | 01:33 | |
| ZipCPU | With the PREFIX, does it work? | 01:34 |
| cr1901_modern | yes. Well I haven't tested it, but I know it'll work :P | 01:34 |
| cr1901_modern | When I see multiple sed expressions laid out like that, my first instinct is "m4 -DDATDIR=$(DATDIR)" etc | 01:34 |
| ZipCPU | Yeah .... but I'm kind of glad it's not using m4 .... that's just one more dependency that would need to be installed to use it. | 01:36 |
| awygle | also I'd have to learn m4 :-P | 01:37 |
| cr1901_modern | (Tbf, POSIX requires m4 to be present :P.) | 01:37 |
| awygle | (technically m4 would just be a build time dependency, not a runtime) | 01:38 |
| ZipCPU | All good arguments | 01:39 |
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| maikmerten | ported my design over the the HX8K breakout board, yay! https://github.com/maikmerten/spu32/commit/5e3401f6a67064faa11896b5a037c142c72cd7bd | 19:02 |
| tpb | Title: initial port of SoC to the Lattice HX8K breakout board · maikmerten/spu32@5e3401f · GitHub (at github.com) | 19:02 |
| maikmerten | turns out it helps to actually double-check pin assignments and not misreading the somewhat wacky silk screen on that board | 19:03 |
| maikmerten | in the icestorm toolchain, is there something more than toying around with the seeds to tweak timings? My design somewhat fluctuates between 45 MHz and 56 MHz depending on minor tweaks (pin assignments, minor logic tweaks far away from the critical path) so I guess "placement and routing luck" has a role here | 19:09 |
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| ZipCPU | maikmerten: Not sure what to say. The arachne-pnr placer isn't really timing driven, so ... it gets different timing's depending upon the random variables used to generate the placement. | 19:31 |
| maikmerten | well, I guess that answers the question quite fine, actually ;-) | 19:37 |
| daveshah | You can pick a seed using -s, or use -r to use a random seed each time | 19:38 |
| daveshah | If you want to experiment without even modifying the design at all | 19:38 |
| maikmerten | I think -r may be very useful if arachne-pnr and icetime are wrapped into a nice little script with a loop to retry if there's no timing closure | 19:45 |
| daveshah | Because arachne-pnr is only single-threaded, it would make sense also to run 4-8 times in parallel too | 19:46 |
| maikmerten | indeed | 19:47 |
| daveshah | I've seen a Makefile which did this once | 19:47 |
| daveshah | https://git.raptorcs.com/git/talos-system-fpga/tree/Makefile | 19:47 |
| tpb | Title: Makefile - talos-system-fpga - Talos™ II FPGA sources (at git.raptorcs.com) | 19:47 |
| maikmerten | my Ryzen would sure like that | 19:47 |
| daveshah | I would not say that Makefile is an example to follow | 19:47 |
| maikmerten | can't be worse than mine. | 19:47 |
| maikmerten | oh my. | 19:48 |
| sorear | at the very least use $(seq 1 64)… | 19:49 |
| maikmerten | yeah, -r for arachne-pnr with brute-force threading sure looks like it has very neat potential https://paste.debian.net/1034143/ | 19:53 |
| tpb | Title: debian Pastezone (at paste.debian.net) | 19:53 |
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| daveshah | Haha, you could add two of the most researched and difficult parts of PnR - parallelisation and timing driven - to arachne in 10 lines of bash... | 19:57 |
| maikmerten | of course, that would be parallelisation with no net speed gain ;-) | 19:58 |
| awygle | but improved QoR which is still a win | 19:59 |
| maikmerten | sure :-) | 20:00 |
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