Boards openroad added

[oharboe]

Waiting for a nit to be fixed in ORFS, but otherwise ready for comments.

OpenROAD ASAP7 PDK configuration

Demonstrates how to set up an bazel-orfs to build darksocv withOpenROAD-flow-scripts

To build and view Install Bazelisk and run:

bazel run //boards/openroad:darksocv_cts /tmp/cts gui_cts

Register to register histogram

Estimated routing congestion

Ideas for future work

• reduce clock period
• darkram.v should consist of serveral SRAMs connected together to be
  a more accurate representation
• create a mock SRAM representation with somewhat realistic timing
• add IO constraints to place pins on one edge of the SRAMs and top level
• reduce area

MegaBoom demonstrates a number of techniques to study a design and set up mock SRAMs.

[samsoniuk]

hmmm... I read about the "Synthesis fails because it doesn't strip $display", maybe I need put some ifdef SIMULATION around such $display across the code... the tools that I use typically ignore them at synth time, but it may cause other tools to fail. I will try address this problem in the future!

Anyway, thanks for the commit! :)

[oharboe]

@maliberty FYI

[oharboe]

hmmm... I read about the "Synthesis fails because it doesn't strip $display", maybe I need put some ifdef SIMULATION around such $display across the code... the tools that I use typically ignore them at synth time, but it may cause other tools to fail. I will try address this problem in the future!

Anyway, thanks for the commit! :)

Not to worry, it is already fixed in ORFS.

If there is any interest in this and some future PR is required, I will bump ORFS and clean out the workaround.

Meanwhile, take it for a spin and let me know if you have any questions :-)

[samsoniuk]

well, just in case, I already fixed it! thanks again! :)

[samsoniuk]

Meanwhile, take it for a spin and let me know if you have any questions :-)

wow! I have lots of questions but not sure that are the right questions... although I am not much aware about the OpenRoad project, the pictures are familiar! so my questions about the number of system gates, node size and the maximum frequency that DarkRISCV can reach on your tools! :)

oh, from the plot it seems that the worst path is around 1.95ns, so it will reach no more than 500MHz... which is pretty good for a 3-stage pipeline core! 🔥

[oharboe]

@samsoniuk Well, take the GUI for a spin. All you have to do is to follow the instructions :-) Install Bazelisk and run the command. Assuming you are on x86 Linux....

[samsoniuk]

yeah! I will check it! :)