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| im-tomu | [tcal-x] Another update -- the donut demo option DOES work, it is just really slow since the VexRiscv used doesn't have a hardware multiplier. | 06:04 |
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| im-tomu | [tcal-x] I rebuilt the VexRiscv using the DSP blocks for a hard multiplier (it failed timing at 44MHz but still works), recompiled the demo with -march=rv32im, and now I have normal donut speed :) | 20:09 |
| daveshah | nice! | 20:09 |
| daveshah | FPGA timings are pretty conservative (-5% Vcc, 85 degrees, worst process) so usually there is plenty of margin | 20:10 |
| im-tomu | [tcal-x] Yep, Tim A had mentioned it to me. I'm glad the LiteX script goes ahead and flashes the bitstream even when timing fails by a bit... | 20:11 |
| tnt | daveshah: otoh aren't the dsp timing completely ignored atm ? | 20:22 |
| daveshah | oh yeah, unless a register gets folded into them | 20:23 |
| daveshah | I forgot that I never finished that | 20:23 |
| tnt | best way to meet timing is to use a path that's not analyzed :D | 20:23 |
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| whatnick | daveshah: Is there going to be a nextpnr-xray available soon ? I was following the Litex release with Xilinix support, it was not clear to me what that implies for nextpnr | 23:01 |
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| whatnick | Perhaps better to ask in #litex , but this channel is more familiar to me | 23:19 |
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