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| agg | alright, it's pretty gross but with some hacking i have got nextpnr to synthesise a bitstream that runs a simple MAC | 05:00 |
|---|---|---|
| agg | but it's also 5am so maybe tidying up can wait... | 05:00 |
| agg | sadly it looks like the reason just copying the diamond config for all the MIB_DSP tiles over the nextpnr bitstream didn't work on day 1 is that diamond activates some inverters on some opcode bits that npnr doesn't know about, so it was feeding it an all-0 opcode and doing nothing, with just those bits removed it would probably have worked fine | 05:16 |
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| daveshah | agg: great work anyway, thanks for looking into this! | 07:32 |
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| agg | for the record, the problem with bstool was it needs to see an Architecture: sa5p00 comment in the bitstream; copying the comment block from a diamond.sh-generated ecpdump-dumped bitstream let it read other bitstreams OK | 15:17 |
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| agg | yay, i've reduced all the config bit differences and database updates to a few lines changed in nextpnr and the stock database | 17:49 |
| agg | can now feed nextpnr two MULT18 and a ALU54 instances (with BEL attribs) and get out a working bitstream that has the same apparent behaviour as diamond | 17:49 |
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