[Libre-soc-bugs] [Bug 485] Create I-Cache from microwatt icache.vhdl

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=485

--- Comment #77 from Cole Poirier <colepoirier at gmail.com> ---
Done.

Have the two different failure modes repro'd, obviously need to have two
different random seeds, as in one case it will fail on first by failing an
assertion, and on the other it will fail on first by looping infinitely.

These are the two failure modes, documented in icache.py. You'll have to
uncomment test_icache() at the bottom of the file and comment/uncomment the
different seeds depending on which repro case you want.

```
129    # fail 'AssertionError: insn @1d8=0 expected 61928a6100000000'
130    #random.seed(41)
131    # fail infinite loop 'cache read adr: 24 data: 0'
132    random.seed(43)
```

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