Any tips for debugging ERROR DRT-0218 (Guide is not connected to design)?

[cdc8600]

I'm trying to port ORFS to a TSMC process, I've been able to complete global routing on a test design, but detailed route ends with openroad crashing after reporting > 1000 DRT-0218 errors, I haven'ts found any explanation for this error, nor in the openroad documentation, neither on the web.
100's of DRT-0229 (genGuides_split split_indices is empty on M2) errors are reported too.

A specific feature of the std. cells library I'm using is that power/groudn rails are laid out in M1 and M2, so that preferred routing direction is horizontal for both layers. As this is not supported by openroad flow, I've set bottom routing layer to M2 (there're no pin access issues, so the trick seems to work). I'm mentioning this in case it may be related to DRT-0218 error.

Thanks in advance for any help in debugging this issue!

[maliberty]

@eder-matheus or @osamahammad21 any thoughts? At a minimum 218 should include the net name.

[cdc8600]

Hi, Thanks for propagating my request of clarification. In the meantime, may someone please explain to me, what condition the DRT-0218 and DRT-0229 errors check? Maybe with this piece of information I can progress a bit in the debugging. Best regards Stefano (aka cdc8600)

…

On Fri, Mar 21, 2025 at 4:29 PM Matt Liberty ***@***.***> wrote: @eder-matheus <https://github.com/eder-matheus> or @osamahammad21 <https://github.com/osamahammad21> any thoughts? At a minimum 218 should include the net name. — Reply to this email directly, view it on GitHub <#2987 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BQVXBFJTZQDVNH6TN6B25C32VQV5JAVCNFSM6AAAAABZPM556OVHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTENJXHA4TAMY> . You are receiving this because you authored the thread.Message ID: <The-OpenROAD-Project/OpenROAD-flow-scripts/repo-discussions/2987/comments/12578903 @github.com>

[osamahammad21]

Hi Stefano,
Sorry for the late reply. DRT-0218 error is an error in processing the guides by DRT indicating the the router is unable to visit all pins through the guides provided for a specific net. Currently the net name is not in the error message but it certainly needs to be added. DRT-0229 error indicates that there is a specific guide that is not connected to any other guide or any pin (floating guide). There error message needs some work as well to help debugging.

[maliberty]

@osamahammad21 please update the messages as that should be quick and might allow us to localize the problem more.

[cdc8600]

Hi, Thanks for the reply, may you please give me some hints about possible problems in the platform setup which can trigger DRT-0218 and DRT-0229 errors? So far the only thing that comes to my mind is the fact I had to set M2 as the bottom routing layer (M1 and M2 both have horizontal direction, which is not supported by openroad flow), could this cause the errors of above? Best regards Stefano

…

On Tue, Mar 25, 2025 at 4:54 PM Osama Hammad ***@***.***> wrote: Hi Stefano, Sorry for the late reply. DRT-0218 error is an error in processing the guides by DRT indicating the the router is unable to visit all pins through the guides provided for a specific net. Currently the net name is not in the error message but it certainly needs to be added. DRT-0229 error indicates that there is a specific guide that is not connected to any other guide or any pin (floating guide). There error message needs some work as well to help debugging. — Reply to this email directly, view it on GitHub <#2987 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BQVXBFKPX24OA5SPSQ5NX232WF327AVCNFSM6AAAAABZPM556OVHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTENRRG4ZDKMY> . You are receiving this because you authored the thread.Message ID: <The-OpenROAD-Project/OpenROAD-flow-scripts/repo-discussions/2987/comments/12617253 @github.com>