openlane has FP_ASPECT_RATIO. which is defined in the docs as The core's aspect ratio (height / width). As I want it taller rather than wider, I choose 2. Then the tools fail because apparently it can only be 0 -> 1. So is there any way of getting taller?

set

FP_SIZING

to

absolute

and then set the

DIE_AREA

(probably it's a good idea to check a previously generated DEF with the relative

FP_SIZING

to get a good estimate on what the DIE_AREA should be).

Not really, it's an

init_fp

limitation. Should be easy to fix and PR to OpenROAD though.