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| sf-slack | <rodrigomelo9> Hi everybody, my name is Rodrigo, from Argentina (my mother tongue is Spanish). I am an Electronic Engineer and I have been working with FPGAs since 2006. I have more experience with Xilinx devices (starting from Spartan 2), but also I used devices from Intel/Altera (Cyclone IV, V, max X), Microchip/Microsemi/Actel (SmartaFusion2 and ProASCI 3) and Lattice (iCE40). Moreover, I am a Free Software user (I mainly | 12:44 |
|---|---|---|
| sf-slack | use Debian GNU/Linux workstations). I have some opensource related projects in GitHub and GitLab (IP cores and tools) but I want to help with opensource FPGA flows. I could help with things related to VHDL, Verilog, Tcl, Python, Bash, Makefiles, FPGA EDA tools, testing things with hardware, etc. As I commented to @me1 here https://github.com/SymbiFlow/symbiflow-arch-defs/issues/1243#issuecomment-569256099, I am interested to | 12:44 |
| sf-slack | start to work getting the Xilinx primitives. Well, it was my introduction for you to know me. Regards | 12:44 |
| tpb | Title: parse_pdf_modules.py seems to be not working · Issue #1243 · SymbiFlow/symbiflow-arch-defs · GitHub (at github.com) | 12:44 |
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| Xiretza | daveshah: hey, do you happen to be at 36c3? I have a few questions regarding nextpnr-xilinx that would probably be easier and faster to talk about in person :) | 14:31 |
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| daveshah | Xiretza: no, I'm not | 15:28 |
| Xiretza | daveshah: ah, alright. I may be doing something wrong, but following the Arty example in the readme, fasm2frames.py fails because it can't find a few *.OSERDESE.* keys, which are generated by xilinx/fasm.cc:124-127. Since I have no idea what I'm doing, I just tried changing OSERDESE to OSERDES there and don't get any warnings anymore - was that a horrible idea? | 15:39 |
| daveshah | Xiretza: it might be a change in prjxray | 15:40 |
| daveshah | I'm not even sure where they come from | 15:40 |
| daveshah | I would need to have more of a look | 15:40 |
| Xiretza | should I just open an issue on github? | 15:40 |
| daveshah | Please do | 15:42 |
| daveshah | Can you include the fasm output too? | 15:42 |
| Xiretza | yeah, I'll do that. there's at least one more thing that broke due to prjxray changes that I managed to fix myself, I'll open a PR(s) for that. | 15:44 |
| daveshah | Thanks | 15:45 |
| daveshah | This is why I am not promoting nextpnr-xilinx too heavily btw (although I'm very glad of other devs testing/helping), it's still a very unstable environment | 15:46 |
| Xiretza | yeah, that's the feeling I got too, the readme however is already a great resource :) | 15:47 |
| Xiretza | daveshah: also, is the nextpnr_rw_usp yosys branch still required? everything seems to be working fine with mainline yosys, don't know if the bitstream is correct though. | 16:32 |
| daveshah | No, mainline Yosys should be OK now | 16:33 |
| daveshah | It hasn't been very well tested and it may occasionally infer distributed RAM primitives that aren't supported, but it would error out in that case | 16:33 |
| Xiretza | daveshah: alright, I'll update the docs then | 16:33 |
| daveshah | Due to some routeability issues, with upstream Yosys adding `-nowidelut` to `synth_xilinx` often results in much shorter route times (with a small timing penalty). This might be something worth adding too | 16:37 |
| daveshah | abc9 would be better but I think it uses a carry primitive that nextpnr-xilinx doesn't support yet | 16:37 |
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| Xiretza | daveshah: I'm assuming `-nobram` is a leftover from when BRAMs weren't as developed yet? it seems to work without it now. also `-nowidelut` actually results in lower f_max with the attosoc example | 18:21 |
| daveshah | Yeah, do note the Fmax numbers it produces are not correct for xc7 btw | 18:23 |
| Xiretza | ah, is the slack histogram any better? it looks about the same as well, with -nowidelut maybe with a little better distribution on the lower end, but nothing major. I'll add it if you say it has a benefit though. | 18:28 |
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| davidthings | daveshah: I pulled and rebuilt prjtrellis this AM from master and after months of flawless performance, my Superconference badges do not do anything when flashed (dfu_utils). I have confirmed old .bit files still work. And even the simplist project (blink an LED) do not work. I'm trying a version of prjtrellis from a month ago to see if I can find a working version. Any hints? Any thoughts? | 18:30 |
| daveshah | Do you mean just prjtrellis or the whole flow? | 18:37 |
| daveshah | I can't think of any reason for this | 18:37 |
| davidthings | I pulled and rebuilt the whole thing | 18:37 |
| davidthings | OK. I'm going to do some binary searches to see if I can find something that works for me. | 18:37 |
| davidthings | I will report back. | 18:38 |
| davidthings | cd .. | 18:40 |
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| davidthings | daveshah: I'm a bit confused... are the authoritative versions of nextpnr and yosys in yosysHQ? And if so, where is the authoritative prjtrellis? IceStorm? | 20:05 |
| daveshah | davidthings: Authoritative Yosys and nextpnr are YosysHQ. prjtrellis is SymbiFlow. icestorm is cliffordwolf | 20:21 |
| davidthings | Thanks | 20:24 |
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| davidthings | Happy to report my code is all working on the latest tools. Somewhere along the way I had started adding the -abc9 flag to Yosys. Removing that makes everything work again. | 21:47 |
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| daveshah | davidthings: `-abc9` should definitely not be breaking things | 21:56 |
| daveshah | can you share the simplest example that it breaks | 21:57 |
| davidthings | Sure. | 22:30 |
| davidthings | Gimme a sec to make something mininal, Dave. | 22:32 |
| davidthings | Here's a fragment that shows the problem. https://pastebin.com/09VVPnsM | 22:41 |
| tpb | Title: [VeriLog] /* Build with the following and no blink. Omit the -abc9 and blink. %.json - Pastebin.com (at pastebin.com) | 22:41 |
| davidthings | Let me know if I can help any further. I'm just so happy that my code works again... | 22:44 |
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