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| bunnie[m] | I'm trying to patch the INIT value for some LUTs in an existing bitstream for an Artix-7. | 11:45 |
|---|---|---|
| bunnie[m] | Does a tool or code already exist that can map a LUT's X/Y offset or row/column number (as shown in Vivado) to a frame address in the bitstream? Alternatively, if there is anyone can point me to docs/code/tools that can elucidate the mapping of the prjxray database format to bitstream frames, I can probably figure it out from there... | 11:45 |
| sf-slack | <tmichalak> @bunnie: tilegrid.json holds this type of information: https://raw.githubusercontent.com/SymbiFlow/prjxray-db/master/artix7/tilegrid.json | 12:20 |
| litghost | bunnie: My recommendation is to round trip to/from FASM | 14:36 |
| litghost | bunnie: Use bit2fasm.py to convert the bitstream to FASM | 14:36 |
| litghost | bunnie: Then you can find the LUT, change it's init value in the FASM file, then use fasm2frames.py + xc7frames2bit to create a new bitstream | 14:36 |
| litghost | bunnie: This works as long as all FASM features decode | 14:37 |
| litghost | bunnie: Make sure to pass "--verbose" to bit2fasm.py to ensure that unknown features get emitted into the FASM file (if any) | 14:37 |
| litghost | bunnie: Then grep the output FASM file for "unknown" | 14:37 |
| bunnie[m] | awesome, thanks so much...! | 14:45 |
| litghost | bunnie: We are working on standalone install files, and they happen to have a good example of how to invoke the FASM to bitstream path: https://github.com/SymbiFlow/symbiflow-arch-defs/pull/1252/files#diff-237813215e9e0eab63227bed4c776208R65-R67 | 14:57 |
| tpb | Title: Add make install target by kgugala · Pull Request #1252 · SymbiFlow/symbiflow-arch-defs · GitHub (at github.com) | 14:57 |
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