Problems when change to a new PDK

[706697916]

I want to develop a new PDK in OpenROAD. I follow the guid "https://openroad-flow-scripts.readthedocs.io/en/latest/contrib/PlatformBringUp.html". Now I have changed the PDK file, makefile, config file. But it seems that OpenROAD cannot recognize the standard cells in new PDK lib.
The three pictures shows my problem. How to solve it or how to debug the codes?

[maliberty]

It looks like you are loading the nangate45 library not those from your new pdk.

[706697916]

Well, I do not change the PDK name, but I changed the code details of PDK and all the relevant codes.

[maliberty]

The first warning is from yosys. I know we've seen similar when you have un-quoted expression in the .lib. If you don't care about those cells you could just ignore it.

For STA-123 can you give the full line it is complaining about?

For the last one - does your process have a layer called metal1? I'm guessing you didn't update setRC.tcl

[706697916]

The line 2601 2605 2609 reports STA-123.
You are right. I did not update the setRC.tcl in my platform.

[maliberty]

We don't support ecsm so resolving those warnings won't make much difference. For now we only support NLDM and in the future will support CCS.

[706697916]

I met another problem that I cannot handle. How to generate a lyt file?
As your tutorial mentioned, I need to generate a lyp file first. But I cannot get it by following the tutorial.

[706697916]

Besides, the route iteration takes very long time. How to reduce the numbers of iteration or release convergence?

[706697916]

I cancelled the use of lyt file. Then the error occured.

[openroadie]

For routing taking too long... have you considered that the chip may be too congested and starting with a larger floor-plan ?

[706697916]

How to change to a larger floor-plan?

[maliberty]

Have you looked at what is in the lyp at the line given? There is no way to guess from a screen shot.

[706697916]

Thank you, I have solved it.

[maliberty]

For routing you should load the drc errors and take a look at where they are occurring.

[706697916]

There are so many optimization iterations, and it takes so much time. I wonder how to reduce the iterations.

[maliberty]

Try setting the envar DETAILED_ROUTE_ARGS to "-droute_end_iter 5" to get it to stop earlier.

[706697916]

Thank you, it works!
Setting the envar DETAILED_ROUTE_ARGS to "-droute_end_iter 5" will get it to stop after 5th optimization iteration.