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lambda | synthesizing a blinky takes 90s from verilog to bitstream for my xc7a35t, adding a liteeth core makes it jump to 6 minutes. is this expected? is there any way to make it faster? it seems to spend quite a bit of time on "Net '[...]' is impossible to route within proposed BLK-TL-SLICEL cluster" messages, not sure if that's normal | 20:07 |
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lkcl | lambda: nextpnr-xilinx is way quicker than vtr (used in symbiflow) | 20:11 |
lambda | does it work? I thought it was mostly dead | 20:11 |
lkcl | i've been using it for complex designs and i haven't found massive show-stoppers yet | 20:12 |
lkcl | it's actually faster build time than nextpnr-ecp5 for the same design, although to be honest that could be down to the fact that the xc7100t (arty a7 100t) has more spare resources | 20:13 |
lkcl | 100k LUTs as compared to an 85k LUTs ECP5 | 20:13 |
lkcl | so is simply having an easier time routing | 20:14 |
lambda | I've used it in the past, but at the time it was somewhat abandoned and yosys changes kept breaking it from time to time | 20:14 |
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lambda | good to hear it's still hanging on | 20:14 |
lkcl | yeah we use yosys-0.13 very deliberately | 20:14 |
lambda | oh | 20:15 |
lkcl | but the reason for that is down to mix-and-match APIs with GHDL and yosys-ghdl-plugin | 20:15 |
lkcl | there was a cross-over point about... mmm.... a year ago? | 20:15 |
lkcl | where *both* ghdl *and* yosys changed APIs | 20:15 |
lambda | idk, ghdl-yosys-plugin seems to work fine with yosys master | 20:16 |
lkcl | ghdl-yosys-plugin was caught in the crossfire of the two incompatible changes | 20:16 |
lkcl | yeah it's likely things have "caught up" now, like the concertina-traffic-jam-effect :) | 20:17 |
lkcl | if you want a confirmed-stable-repro-build script for nextpnr-xilinx, to try it out: | 20:18 |
lkcl | https://git.libre-soc.org/?p=dev-env-setup.git;a=blob;f=nextpnr-xilinx-install;hb=HEAD | 20:18 |
tpb | Title: git.libre-soc.org Git - dev-env-setup.git/blob - nextpnr-xilinx-install (at git.libre-soc.org) | 20:18 |
lambda | thanks, I might come back to that if I can't get it working as-is | 20:18 |
lkcl | lines 85 onwards if you've a different FPGA from the xc7100t you'd need to adapt it | 20:19 |
lambda | right now I'm happy to have an FPGA that replies to ICMP :) | 20:19 |
lkcl | :) | 20:19 |
lambda | oh cool, someone actually packaged it in the AUR in the meantime, let's see how broken that is | 20:26 |
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lambda | update: somewhat | 20:52 |
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lambda | lkcl: hah, 60s for the liteeth design with nextpnr-xilinx | 21:51 |
lambda | and at least half of that is yosys | 21:51 |
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