Matt Liberty
Matt Liberty
Is slang separate from yosys-slang? Wondering if slang would be a dependency.
A submodule is nothing more than a link to a commit in another repo. See https://github.com/The-OpenROAD-Project/OpenROAD-flow-scripts/tree/master/tools 
If you are aware then why ask "where is the link to the original rep documented?"
You can look at the fork to see differences if that's important: 
Examine the congestion heat map in the GUI and paste an image here for help
https://openroad-flow-scripts.readthedocs.io/en/latest/tutorials/FlowTutorial.html#using-heat-maps
The GUI uses the .odb file.
It looks like the placement density is too high - what do you have it set to?
With no test case it is hard to help. In order to lower the density further you may need to expand the area for the block.
A test case is something that runs and reproduces the issue rather than just some text and images. What does "I really need to complete this project in time." refer...