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Have you already solved this problem? I've just encountered with the same problem with you and I tried all method mentioned in this thread but doesn't work.
I hope you can help me in some degree...
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Yep, the problem is a bug inside the SOPC buildeir.
When i started a fresh new project everything goes ok, but when inside SOPC i modified the clk frequency of DDR the SOPC builder failed to generate appropiate files and then likely some internal timing violation occurs.
The problem is 100% replicable with Nios 11.1sp2 with DDR block and TSE.
If you have a similar issue, start a new project and rebuild manually from scratch the SOPC configuration.
P.S. SOPC builder even when it failed to generate appropiate files still show "generated successfully" at the end, however in the middle of the log i saw a "failed"
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