[BUG] error when synthesis

[hhhsiang]

Is there an existing CVA6 bug for this?

• [X] I have searched the existing bug issues

Bug Description

When I synthesize cv64a6 core with cv64a6_imafdc_sv39_config_pkg.sv with Design Compiler version-2023.12, there are lots of error occurred, and all of them like the following：

Error: ../..//core/scoreboard.sv:303: Constant expression too complex. (ELAB-937)

It's all about "Constant expression too complex. (ELAB-937)". I check the systemverilog code where the error happened. All of the errors seem to be caused by the parameter of cva6 config pkg.

When the parameters of cva6_config_pkg are used to determine whether a circuit or a module will be instantiated, the "Constant expression too complex. (ELAB-937)" error occurred. Lots of modules are not synthesized. How can I fixed it?

Any advice or suggestions would be greatly appreciated. Thanks in advance!

[JeanRochCoulon]

Hello @hhhsiang The synthesis is run on cv32a65x, no experience on 64 bit configuration. Do you experience the same type of error on cv32a65x configuration ?

[hhhsiang]

Hi @JeanRochCoulon , as far as i know, the cv64a6 was synthesized in the past, so there are scripts in Makefile under the cva6/pd/synth directory. Because in the old commit cv64a6 is the synthesis target in the makefile, I'm confused why did you say no experience on 64 bit configuration?

I also tyr to synthesize cv32a65x, with make -C pd/synth cva6_synth FOUNDRY_PATH=/your/techno/basepath/ TECH_NAME=yourTechnoName TARGET_LIBRARY_FILES="yourLib1.db\ yourLib2.db" PERIOD=10 NAND2_AREA=650 TARGET=cv64a6_imafdc_sv39 ADDITIONAL_SEARCH_PATH="others/libs/paths/one\ others/libs/paths/two", but there is error occurred like the following： It seems that $(SYNTH_FLOW_NAME) parameter is not set properly.

[JeanRochCoulon]

Yes, you are right, I personally setup maybe 3 years ago the scripts to synthetize 32 and 64 bits configurations. But we currently use different scripts to do it. That is why these scripts are no more used.

[hhhsiang]

Understood. Could you share the script you use for synthesizing the 64-bit configuration? I find it challenging to create a script that successfully synthesizes the CV64A6 core, given the numerous dependent files that need to be included and preprocessed.

[JeanRochCoulon]

Unfortunately, physical implementation depends on techno which we cannot disclose it.