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| Adrien[m] | Hi ! I am experimenting routing for Zynq target, using nextpnr-himbeachel instead of nextpnr-xilinx (see https://github.com/YosysHQ/nextpnr/pull/1352 BTW) | 17:36 |
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| Adrien[m] | But now I'm facing an error which suggests nextpnr-himbeachel for Xilinx arch is no "feature-parity" with nextpnr-xilinx, is that true ? | 17:38 |
| Adrien[m] | ERROR: Unable to find legal placement for cell 'user_inst.$abc$4612$auto$blifparse.cc:535:parse_blif$4646.genblk1.genblk1.genblk1.genblk1.genblk1.genblk1.genblk1.genblk1.genblk1.genblk1.mux8' after 53302 attempts, check constraints and utilisation. | 17:38 |
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| Adrien[m] | How is support for mux8 ? | 17:39 |
| Adrien[m] | Hum weird it's `mux8` and not `muxf8` | 17:44 |
| Adrien[m] | Maybe mux8 is a sort of macro generated by yosys and that hibaechel does not know it's a slice | 17:44 |
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| lofty | Adrien[m]: indeed, the himbächel port is not yet at parity with the original -xilinx. But rather importantly: the himbächel port is in upstream, and -xilinx never made it :p | 20:06 |
| Adrien[m] | For now, it seems using -nowidelut in yosys makes the thing placeable by himbaechel | 20:11 |
| Adrien[m] | Aud routable ! | 20:12 |
| Adrien[m] | Except for an assertion after final report of slack histogram | 20:12 |
| * Adrien[m] sent a code block: https://catircservices.org/_matrix/media/v3/download/catircservices.org/ykifguSSzlUTKEwdOpPAllNe | 20:12 | |
| Adrien[m] | Argh ! its the dreaful IOI SING thingy | 20:16 |
| Adrien[m] | Similar issue than for somlo then | 20:16 |
| lofty | Adrien[m]: there *is* code to handle MUXF8 | 20:23 |
| Adrien[m] | Other than that, I'm so happy to see the device database files that are really small, good factorization, thanks authors 👍️ <3 | 20:23 |
| lofty | Adrien[m]: that's one of the big selling points of himbaechel | 20:24 |
| Adrien[m] | lofty yes, but there is not muxf8 directly, rather what I call a macro, `mux8` | 20:26 |
| Adrien[m] | which can be expanded into one slice with luts and muxf7+muxf8 indeed at any step in the flow, just it seems that expansion is the missing piece. | 20:26 |
| Adrien[m] | drawback of -nowideluts in yosys is that muxf7/8 don't seem to be used at all, there are only luts. | 20:27 |
| lofty | that's because -nowidelut disables use of those | 20:27 |
| lofty | but like | 20:27 |
| lofty | https://github.com/YosysHQ/yosys/blob/main/techlibs/xilinx/lut_map.v | 20:27 |
| lofty | Yosys should be reporting MUXF7/MUXF8 in the output | 20:29 |
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