ERROR: Missing cost information on instanced blackbox ram_2048x39

[oharboe]

Subject

Describe the bug

untar and run https://drive.google.com/file/d/1WaywLtJc3bCI4qxki1PdbsxYTOPxkhXK/view?usp=sharing

$ ./run-me-lsu_dccm_mem_netlist_synth-asap7-netlist.sh
[deleted]
25. Executing KEEP_HIERARCHY pass.
<suppressed ~829 debug messages>
ERROR: Missing cost information on instanced blackbox ram_2048x39

Expected Behavior

No error

Environment

ORFS v3.0-2528-ga8780221e

To Reproduce

See above

Relevant log output

Screenshots

No response

Additional Context

No response

[oharboe]

@povik I don't know if this is an interesting problem, but I tought I might provide a test-case. It happens when I incorrectly set SYNTH_HIERARCHICAL=1 when I should be flattening in parallel synthesis.

[maliberty]

see #2889

[povik]

I'm on the edge as to whether this should be a warning or an error. The message means there's a blackbox with no area information to use for the ungrouping decisions in SYNTH_HIERARCHICAL mode

The message could be improved at least by telling people what to do to fix it. Let me assign myself to do that.