Detect area too small for PDN earlier in the flow

[armleo]

Description

Setting a small die area crashes the flow, as the minimized PDN has pitch smaller than 2 x (width + spacing). Maybe a relevant warning can be added? An error when the run is just starting stating that the die area too small, should do fine. Perfectly a fix of this.

Environment

Kernel: Linux v5.11.0-49-generic

Distribution: ubuntu 21.04

Python: v3.9.5 (OK)

Container Engine: docker v20.10.10 (OK)

OpenLane Git Version: 2022.01.13_01.51.43

pip:click: INSTALLED

pip:pyyaml: INSTALLED

pip:venv: INSTALLED

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PDK Version Verification Status: OK

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Git Log (Last 3 Commits)



8ad16ce 2022-01-20T13:08:19+02:00 Move reading SDC file earlier (#871) - Anton Blanchard -  (HEAD -> master, origin/master, origin/HEAD)

6871aa8 2022-01-20T13:07:26+02:00 Remove manual tech mapping of muxes and get abc to map them (#873) - Anton Blanchard -  ()

c01e53a 2022-01-12T18:40:17-03:00 Fix for make pdk (#861) - Vitor Bandeira -  (tag: 2022.01.13_01.51.43)

Reproduction Material

small_die_test.zip

Expected behavior

Flow not crashing, or crashing with a warning about DIE AREA being too small.

Logs

[ERROR PDN-0085] Pitch 6.079999999999998 specified for layer met5 is less than 2 x (width + spacing) (width=1.6, spacing=3.04).

Error: pdn_cfg.tcl, 39 PDN-0085

[donn]

We'll see. Issues are not really high priority given that there's one of me.

This isn't a crash. A crash would be a segmentation fault or some such. This is simply an error.

[kareefardi]

Adding OL2 tag to this as such an enhancement is not needed with OL2 since with the ease of rerunning steps.