Can't find instance if use ABC_CLOCK_PERIOD_IN_PS for sky130hd chameleon about openroad-flow-scripts

[rovinski]

@vijayank88 this is because the way chameleon is set up is very brittle. _3252_ is an auto-generated instance name from yosys. The creator(s) of this design ran synthesis to get the auto-generated instance names of the macro(s), then put those names in the config file.

By changing ABC_CLOCK_PERIOD_IN_PS, you are causing a perturbation in yosys which causes the instance name of the macro to be changed to something else, thus _3252_ doesn't exist. The best solution would be to find a workaround that doesn't require an auto-generated instance name in the config file.

[maliberty]

Why is platforms/sky130hd/chameleon in the platform and not in the design? Why does this design need a manual macro placement at all?

[rovinski]

Why does this design need a manual macro placement at all?

Same issue as in #217 (comment). Macro placer does not do a good job and leads to failures.

[maliberty]

That PR is danglig with "@rovinski what remains to do here?" The chameleon issue had been resolved.

[vijayank88]

chameleon is part of CI. Shall we close this as resolved? @maliberty