feat: misc openroad features and enhancements #608
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* `Yosys.JsonHeader`, `Yosys.*Synthesis`
* **Internal**:
* Steps are no longer `TclStep`s: rewritten in Python and now use `libyosys`. While there are no functional changes, this enhances the codebase's consistency and helps avoid tokenization-related security issues.
* `Yosys.*Synthesis`
* ABC scripts used now created dynamically and dumped as a `.abc` file into the step directory.
* Updated `nix-eda`
* `yosys` -> `0.44` (+ `-y` patch)
* `klayout` -> `0.29.4`
* OpenROAD now used with new `withPythonPackages` features to use Python packages specifically for the OpenROAD environment
* `OpenROAD.*`
* Added `log_cmd` from OpenROAD-flow-scripts -- neat idea for consistency
* **Internal**: Steps now sensitive to `_OPENROAD_GUI` environment variable -- coupled with `--only`, it runs a step in OpenROAD then doesn't quit so you may inspect the result.
* This is not part of the OpenLane stable API and may be broken at any moment.
* `OpenROAD.CutRows`
* Rows that generate less than a specified number of sites are now removed to help with PDN generation (default: 25)
* Created `OpenROAD.HierarchicalMacroPlacer`
* Based on OpenROAD `mpl2`-- a macro placer that uses hierarchy information from the RTL to generate a macro placement automatically
* Used for macros for which a manual placement has not been provided
* Created `OpenROAD.UnplaceAll`
* Removes placement status of all instances.
* `Yosys.Synthesis`
* `SYNTH_NO_FLAT` replaced with `SYNTH_HIERARCHY_MODE` with three options: `flatten` (previously `false`), `deferred_flatten` (previously `true`) and `keep` (new value). When set to `keep`, the netlist generated is hierarchical.
## Flows
* Classic
* Added `OpenROAD.HierarchicalMacroPlacer` after `Odb.ManualMacroPlacement`
* Moved pin placement flow before macro placement as `mpl2` requires pin placement information
* Added `OpenROAD.UnplaceAll` after pin placement so rows can be cut for macros without worries about already-placed instances
## Tool Updates
* `openroad` -> `49a497a`
* Enhanced overlay for `or-tools` to fix a bug where trying to build OpenROAD from a git repo (using nix develop .#openroad) would Cmake always fail after the first `cmake ..`
commit e7a0e71 Author: Kareem Farid <kareefardi@users.noreply.github.com> Date: Sun Nov 3 13:22:53 2024 +0200 lint Signed-off-by: Kareem Farid <kareefardi@users.noreply.github.com> commit 9e25b72 Author: Kareem Farid <kareefardi@users.noreply.github.com> Date: Sun Nov 3 13:11:51 2024 +0200 update changelog, Verilator.Lint, Yosys.JsonHeader Signed-off-by: Kareem Farid <kareefardi@users.noreply.github.com> commit 36bca9b Author: Kareem Farid <kareefardi@users.noreply.github.com> Date: Sun Nov 3 12:52:59 2024 +0200 bugfix: allow unsetting variables in configuration files Signed-off-by: Kareem Farid <kareefardi@users.noreply.github.com> commit b0246e6 Author: Kareem Farid <kareefardi@users.noreply.github.com> Date: Tue Oct 29 15:29:20 2024 +0300 hotfix: incorrect error message when substiuting with a nonexistent step commit 19109e1 Author: Mohamed Gaber <donn@efabless.com> Date: Sat Oct 26 20:12:12 2024 +0300 bugfix: odb steps dropping PYTHONPATH (#592) * `Odb.*` * Fixed OpenROAD dropping user-set `PYTHONPATH` values. ## Tool Updates * Use `NIX_PYTHONPATH` instead of `PYTHONPATH` in Docker and devshells to avoid collisions with user-set `PYTHONPATH` variables. commit 627a5ab Author: Mohamed Gaber <donn@efabless.com> Date: Thu Oct 24 11:03:55 2024 +0300 nix: make flake.createOpenLane shell more ergonomic ## Tool Updates * `flake.createOpenLaneShell` now gets OpenLane from `python3.pkgs`. * Fixed issue with `flake.createOpenLaneShell` where plugins would not get included due to an operator precedence issue. commit 8451508 Author: Mohamed Gaber <donn@efabless.com> Date: Thu Oct 24 10:57:58 2024 +0300 hotfix: regression in nix/create-shell.nix commit 1bfa43d Author: Mohamed Gaber <donn@efabless.com> Date: Mon Oct 21 21:05:05 2024 +0300 Temporarily revert Colab's OpenLane version until it's fixed Signed-off-by: Kareem Farid <kareefardi@users.noreply.github.com>
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OpenROAD.*log_cmdfrom OpenROAD-flow-scripts -- neat idea for consistency_OPENROAD_GUIenvironment variable -- coupled with--only, it runs a step in OpenROAD then doesn't quit so you may inspect the result.OpenROAD.CutRowsFP_PRUNE_THRESHOLDto prune rows not meeting the threshold after cutting.Created
OpenROAD.UnplaceAllMisc. Enhancements/Bugfixes