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| foofoo | Is there any way of doing floorplanning on ECP5 with yosys and nextpnr? I have been looking around for such an example... | 14:51 |
|---|---|---|
| daveshah | there isn't really a nice UI for it but it is technically doable with the Python API | 14:52 |
| daveshah | this is an example for ice40: https://github.com/YosysHQ/nextpnr/blob/master/ice40/examples/floorplan/floorplan.py | 14:53 |
| tpb | Title: nextpnr/floorplan.py at master · YosysHQ/nextpnr · GitHub (at github.com) | 14:53 |
| daveshah | if you create the netlist with -noflatten then you can use hierarchical cell names in constrainCellToRegion rather than the nasty attribute trick that example uses (I haven't got round to updating the example since adding support for that though) | 14:53 |
| foofoo | Ah right, I actually found that ice40 example but was not able make any sense of how the attributes were propagated. | 14:54 |
| foofoo | -noflatten is probably exactly what I was missing then | 14:55 |
| daveshah | You can then ignore the attributes altogether and just give the path to the entire module you want to floorplan in constrainCellToRegion | 14:57 |
| daveshah | This is a bit experimental still and hasn't been used much in anger yet | 14:57 |
| foofoo | Cool, I will give it a go. Thanks! | 14:58 |
| daveshah | Please create a GitHub issue if anything goes wrong | 15:00 |
| foofoo | Hmm, but if I specify a path to something that does not exist to constrainCellToRegion it gives no error. Is that intentional? | 15:25 |
| daveshah | That's a bug, it should probably be at least a warning | 15:33 |
| foofoo | Ok, I try it out a bit more then write something in Github about the issues I had. | 15:37 |
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| mithro | Love to hear peoples ideas around https://twitter.com/mithro/status/1292189637566320640 -- the more different ways people can come up with the better | 20:04 |
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