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| kbeckmann | _florent_: thanks for the reply! yeah that makes a lot of sense, migrating is probably a pretty high risk in its own. being able to use nMigen modules together with litex sounds like a good start. | 08:41 |
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| somlo | daveshah: this is going to start out as a high level, dumb-user question... Back about a month ago, I used to be able to sometimes reach 60MHz for Litex+Rocket on the versa (with -abc9 -nowidelut and the xc7dsp patch, still a PR at the time). FWIW, commits were yosys #c7f1368, trellis #f692269, nextpnr #927077e. | 14:40 |
| somlo | With recent versions (right now it's yosys #2daa568, trellis #e2e10bf, nextpnr #c365dd1 but I've been about it for the last week or so) I'm only reaching about 10MHz less on average, and couldn't hit 60MHz after running the build in a loop over the last 24+ hours. | 14:40 |
| somlo | Is there something else I should try, flag-wise, and/or do you know of a possible explanation as to why the average Fmax would have dropped by 10MHz? | 14:41 |
| somlo | Sorry, I know it's not a lot to go on :) | 14:41 |
| daveshah | I can only think it's related to the 36-bit BRAM change | 14:47 |
| daveshah | I can't think why that would reduce Fmax though | 14:47 |
| acathla | somlo, any debug wire left somewhere? | 15:17 |
| somlo | daveshah: maybe I'm just unlucky, 60MHz was never a straightforward, reliable outcome; it's just that I've been looping harder and longer than I remember before without managing to land on one... | 15:34 |
| somlo | acathla: same design as before, no additional debug wires added in recent memory :) | 15:34 |
| somlo | daveshah: maybe I should just focus on the trellis board and forget about versa -- then I won't have to '-nowidelut' to barely squeeze everything within 45k | 15:35 |
| somlo | btw, does the 36-bit BRAM thing have an 'off' switch I could try? | 15:36 |
| daveshah | There isn't one as I wasn't expecting regressions, but you could try removing the "PDPW" sections from https://github.com/YosysHQ/yosys/blob/master/techlibs/ecp5/bram.txt | 15:42 |
| tpb | Title: yosys/bram.txt at master · YosysHQ/yosys · GitHub (at github.com) | 15:42 |
| daveshah | Or, reverting https://github.com/YosysHQ/yosys/pull/1425 in its entirety | 15:42 |
| tpb | Title: ecp5: Add support for mapping 36-bit wide PDP BRAMs by daveshah1 · Pull Request #1425 · YosysHQ/yosys · GitHub (at github.com) | 15:42 |
| somlo | daveshah: thanks, I'll give that a shot, and report back if I notice a difference... | 15:58 |
| lolsborn | People running diamond, are you doing so using LiteX on Windows or Linux? I've had nothing but issues running it on Ubuntu, but I'm not sure what the cause is. | 15:59 |
| daveshah | I've used LiteX with Diamond on Linux without any problems | 16:01 |
| daveshah | What issues are you seeing? Does Diamond run alright on its own? | 16:01 |
| lolsborn | I can find the error, but basically it was running out of stack when running synth | 16:01 |
| daveshah | Might be a memory inference issue | 16:03 |
| lolsborn | I have only 8gb of ram on this machine, I don't know if that is enough, but the system wasn't showing it was memory constrained when running | 16:03 |
| lolsborn | This is what the error looks like https://gist.github.com/lolsborn/1f54a68c23e3719d2e5d64d778f24c2b | 16:06 |
| tpb | Title: diamond error · GitHub (at gist.github.com) | 16:06 |
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| _florent_ | lolsborn: strange, are you building an example target from litex-boards? I'm also using Diamond on Linux without issues | 16:12 |
| daveshah | Seems like that error is coming from Tcl | 16:14 |
| daveshah | Which is even odder | 16:14 |
| daveshah | The only thing I can think of is Diamond version. I've only ever used 3.10 | 16:14 |
| lolsborn | I haven't tried synthing other designs on this machine in diamond. I'm just building the ulx3s target with picorv32. Works perfectly with Trellis. | 16:15 |
| lolsborn | Using Diamond 3.11.0 | 16:16 |
| lolsborn | I might just try reinstalling | 16:17 |
| lolsborn | daveshah: are you running Ubuntu? | 16:17 |
| daveshah | No, Arch Linux | 16:17 |
| lolsborn | I had to unpack the rpm and run the install scripts manually | 16:18 |
| daveshah | I've previously run Diamond on Ubuntu 18.04 without issues too | 16:18 |
| daveshah | Yep, I did the same | 16:18 |
| lolsborn | I'll try reinstalling | 16:19 |
| daveshah | I'd try 3.10 at the same time | 16:20 |
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| lolsborn | will do | 16:30 |
| lolsborn | This is where I'm at with diamond on ubuntu https://gist.github.com/lolsborn/53d956b6d22e13c590050fab89c2289c this seems to happen with 3.10 or 3.11 the command I am running is at the bottom | 18:20 |
| tpb | Title: Issue with LiteX using diamond · GitHub (at gist.github.com) | 18:20 |
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| somlo | daveshah: after reverting yosys PR 1425 (but keeping trellis and nextpnr at yesterday's latest), I'm still hovering in the 45-50MHz Fmax | 18:47 |
| somlo | maybe it's just that I've exhausted my quota of good luck earlier on, and now all the random seeds I end up with are balancing out the karma :) | 18:48 |
| daveshah | I can't see anything obvious on the nextpnr side that would be causing issues | 18:49 |
| daveshah | Could have been another Yosys change or just bad luck as you say | 18:50 |
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| somlo | ok, I'll write it off to karma, keep spinning, while I work on migrating to the trellis board :) | 18:51 |
| lolsborn | looks like this might be the issue I'm having https://electronics.stackexchange.com/questions/327527/lattice-icecube2-error-synplify-pro-321 | 19:05 |
| tpb | Title: fpga - Lattice iCEcube2, error synplify_pro 321 - Electrical Engineering Stack Exchange (at electronics.stackexchange.com) | 19:06 |
| _florent_ | somlo: can you try to revert https://github.com/enjoy-digital/litex/commit/1425a68d9e68cd6af4508d4369512684d1b97138 and rebuild? that's the only change i can think of regarding litex during last month that could impact timings | 19:37 |
| tpb | Title: wishbone2csr: refactor using FSM, reduce latency (make it asynchronou… · enjoy-digital/litex@1425a68 · GitHub (at github.com) | 19:37 |
| somlo | _florent_: I'll try that one next, thanks! | 19:55 |
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| lolsborn | I finally got Diamond working, man that was painful. The only thing I think could improve in LiteX is discovery of Diamond if --gateware-tool-path is not specified. /opt/Diamond seems arbitrary since the rpm installs to /usr/local/diamond and if you create a symlink with a trailing / it breaks. The real issue on Ubuntu though is /bin/sh being a symlink to dash and breaking many of the scripts in diamond | 20:45 |
| lolsborn | fwiw 3.11 seems to work fine | 20:50 |
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| _florent_ | lolsborn: ok good for Diamond, i'll try to add automatic discovery soon | 20:57 |
| lolsborn | I may make a script that installs converts diamond rpm to deb, installs it and then changes all the scripts from sh to bash just because everyone in my office uses ubuntu/debian and I think it would be useful for other folks | 21:01 |
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