[Libre-soc-bugs] [Bug 491] MMU POWER9 pipeline needed

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=491

--- Comment #3 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
        majorop := unsigned(f_in.insn(31 downto 26));
        if f_in.fetch_failed = '1' then
            v.valid := '1';
            -- Only send down a single OP_FETCH_FAILED
            if r.decode.insn_type = OP_FETCH_FAILED then
                v.valid := '0';
            end if;
            v.decode := fetch_fail_inst;


also, like interrupts, if a fetch fails run a new op (microcode style)

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