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    "name": "@mole99 I just updated my project with",
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      "timestamp": "2025-10-16T14:35:18.751+00:00",
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      "content": "Yes, I rebased leo/gf180mcu on top of the latest dev branch. The OpenROAD version, however, is still the same, so I wouldn't expect any changes regarding GPL.\nFor now, the best way forward with GPL is to set `PL_TIME_DRIVEN: False`.\n\nCould you post your STA error? Even better if you could share your repository with the latest changes. Is it still https://github.com/AvalonSemiconductors/ws-submission-2025?",
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      "content": "I updated the repo",
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      "content": "Thanks for uploading the changes to your repo. I was able to reproduce the failure and trace it back to my latest changes to the `pdk_compat` code in LibreLane. `pdk_compat` migrates old PDK variables to newer formats, however, for gf180mcu a number of variables were simply overwritten instead of checking whether they already existed. This makes it impossible to update the PDK variables to the newer format.\nTherefore, I added some logic that checks whether the new variables already exist before setting their values.\n\nThis worked fine, except for `SYNTH_CLK_DRIVING_CELL`, which it is not a new variable, but its format changed. As this variables already existed in the PDK in the old format, it was not set to the new value, which led to the issue you saw.\n\nAs the project template uses a custom SDC file, this issue did not appear there.",
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      "content": "I've updated the leo/gf180mcu branch as well as the template project. With the latest changes and this config.yaml I was able to build your project:\n\n```\nmeta:\n  version: 2\n  flow: Classic\n  substituting_steps:\n    KLayout.DRC: null\n    Checker.KLayoutDRC: null\n\n# DO CHANGE\nDESIGN_NAME: user_project_example\nVERILOG_FILES: dir::src/user_project_example.v\nCLOCK_PERIOD: 20\nDIE_AREA: [0, 0, 250, 250]\nRUN_MAGIC_DRC: true\n# Valid values are AREA 0-3 and DELAY 0-4\n# DELAY 4 = fastest, but largest area\n# AREA 3 = slowest, but smallest area\nSYNTH_STRATEGY: DELAY 0\n\n# DO NOT CHANGE\nRUN_CTS: true\nMAX_FANOUT_CONSTRAINT: 4\nCLOCK_PORT: clk_i\nVDD_NETS: [\"VDD\"]\nGND_NETS: [\"VSS\"]\nVERILOG_POWER_DEFINE: \"USE_POWER_PINS\"\nRT_MAX_LAYER: Metal4\nFP_PIN_ORDER_CFG: dir::pin_order.cfg\nFP_PDN_MULTILAYER: false\nFP_SIZING: absolute\nPL_TIME_DRIVEN: False\n```",
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      "content": "Note that if you wish to use KLayout DRC in LibreLane, you need the PDK fork of wafer.space, since the changes haven't been upstreamed yet.",
      "author": {
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      "content": "Btw. in your update from upstream you missed:\n\n```\nCLOCK_NET: clk_pad/Y\n```\n\nin librelane/config.yaml",
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      "content": "No, I have it. Did it not end up in the commit?",
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      "content": "All good! I missed it while looking at the diff in GitHub.",
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      "content": "Regarding `SYNTH_STRATEGY`, from the LibreLane docs: \"Please note that there is no way to know which strategy is the best before trying them.\"\nSo it really depends on the design you implement.",
      "author": {
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      "content": "I find DELAY does work to enhance max clock rate greatly, though the difference in DELAY 3 and DELAY 4 is negligible.",
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