open-source-silicon.dev

<https://github.com/The-OpenROAD-Project/OpenLane/pull/1671|#1671 More strict antenna violations repair>
Pull request opened by <https://github.com/mo-hosni|mo-hosni>
**Issue**

Strategies 3 and 6 antenna repair leaves ~300-1000 antenna violations in designs larger than 1mm x 1mm in sky130.

**Fix**

Increased `GRT_ANT_ITERS` from 3 to 15.  
Added `GRT_ANT_MARGIN` which is the margin to over fix antenna violations in global routing with a default value of 10%.
<https://github.com/The-OpenROAD-Project/OpenLane|The-OpenROAD-Project/OpenLane>
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<https://github.com/The-OpenROAD-Project/OpenLane/pull/1671|#1671 More strict antenna violations repair>
Pull request merged by <https://github.com/kareefardi|kareefardi>
<https://github.com/The-OpenROAD-Project/OpenLane|The-OpenROAD-Project/OpenLane>