[Libre-soc-bugs] [Bug 689] New: MMU PortInterface raises addr_ok_o even on a misaligned access exception

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=689

            Bug ID: 689
           Summary: MMU PortInterface raises addr_ok_o even on a
                    misaligned access exception
           Product: Libre-SOC's first SoC
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: CONFIRMED
          Severity: enhancement
          Priority: ---
         Component: Source Code
          Assignee: lkcl at lkcl.net
          Reporter: cestrauss at gmail.com
                CC: libre-soc-bugs at lists.libre-soc.org
   NLnet milestone: ---

In pymem.py, it is written: "conversely: addr_ok_o must *ONLY* be asserted if
there is a HUNDRED PERCENT guarantee that the memory request will be
fulfilled."

When running test_issuer_mmu.py, on the LDSTExceptionTestCase(), I noticed that
addr_ok_o is unexpectedly raised, on the same cycle as exc_happened (run
"gtkwave issuer_simulator.gtkw", see "ld/st port interface" section).

I think this wasn't supposed to happen, even if the LDSTCompUnit didn't seem to
actually care in this case.

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