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openhwgroup
AXI UVM issue when integrating HPDCache
Is there an existing CVA6 bug for this?
- [X] I have searched the existing bug issues
Bug Description
When switching WT cache to HPD cache, 4 AXI assertions stop the simulations:
When commenting the 4 assertions, the hello word test stops on timeout after 300s. When switching the AXI from active to passive, the test passes.
This failure is using vcs-uvm target. The Thales developing branch is hpdcache0
When I debugged the 'hello-world' test in the smoke-tests, I found that the problem is originating from the RTL. The bug occurs when we randomize the 'aw_delay,' which indicates the delay between AWVALID and AWREADY.
Hello,
Thank you for the report.
Can you please send the command line to rerun your test ?
When I debugged one of the ADD assembly tests, I saw that the problem came effectively for a write, but what I saw, is that the HPDcache sent both the address (AW) and the data (W) but it never received a response for it (B). So, in my case it looks more like a problem from the test environment.
When I reviewed the log file, I didn't notice that the agent didn't sent response, but when you mentioned it, I observed the waveform and I realized that when the address is accepted by the agent after the data, the agent does not send a response. Therefore, this is a bug in the agent.
I think @AEzzejjari is oOo Today. Alae has fixed the AXI agent. I am (trying) to bump core-v-verif to CVA6... Not sure to succeed soon, because two PRs are in collision.
Ok great ! No problem, I'm glad that you have found (and fixed) some issues.