Summary
On the 2026-06 upgrade, snitch_cluster-nangate45 completes synth + floorplan but the new OpenROAD global placer hangs on the 1.5 M-cell design: it ran ~8 h, dropped to 0 % CPU at ~iter 472 / overflow 0.63 (deadlocked, no progress), and was killed. Stops at 2_floorplan.
Detail
asap7 snitch_cluster (same RTL) converges and closes (+387 ps), so this is nangate45-specific GPL behaviour under the new placer. No sky130hd port.
Scope
Needs GP parameter work (e.g. GPL_* density/routability) or an upstream fix — out of scope for the flow-knob upgrade. Pre-existing-style non-closure (did not finish before either). See designs/src/snitch_cluster/DECISIONS.md. Part of PR #195.
Summary
On the 2026-06 upgrade, snitch_cluster-nangate45 completes synth + floorplan but the new OpenROAD global placer hangs on the 1.5 M-cell design: it ran ~8 h, dropped to 0 % CPU at ~iter 472 / overflow 0.63 (deadlocked, no progress), and was killed. Stops at
2_floorplan.Detail
asap7 snitch_cluster (same RTL) converges and closes (+387 ps), so this is nangate45-specific GPL behaviour under the new placer. No sky130hd port.
Scope
Needs GP parameter work (e.g.
GPL_*density/routability) or an upstream fix — out of scope for the flow-knob upgrade. Pre-existing-style non-closure (did not finish before either). Seedesigns/src/snitch_cluster/DECISIONS.md. Part of PR #195.