Why does uvm_reg_map::get_n_bytes() return 0 if you call it on a system level map? That is completely useless and tells me nothing about the system.
If on the other hand, I call uvm_reg_map::get_n_bytes() from a lower level map in my register model, then I get the narrowest bus width in the map hierarchy. That makes sense. It seems I should get that same value when calling get_n_bytes() on the system level map. Returning 0 is not useful under any circumstance.