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    SubjectRe: [patch] oprofile for ppc
    Andrew Fleming writes:
    >
    > On Monday, Mar 10, 2003, at 20:14 US/Central, Segher Boessenkool wrote:
    >
    > > Albert Cahalan wrote:
    > >> On Sun, 2003-03-09 at 22:50, Segher Boessenkool wrote:
    > >>> Benjamin Herrenschmidt wrote:
    > >>>> Beware though that some G4s have a nasty bug that
    > >>>> prevents using the performance counter interrupt
    > >>>> (and the thermal interrupt as well).
    > >>>
    > >>> MPC7400 version 1.2 and lower have this problem.
    > >> MPC7410 you mean, right? Are those early revisions
    > >> even popular?
    > >
    > > 7400 and 7410 core versions are identical, afaik. I don't
    > > think any 7410 core lower than version 2.0 was ever used
    > > in any consumer machines. ymmv.
    >
    > I've been looking into this, and all versions of the 7410 before 1.3
    > (where it was fixed) have this errata. And there is no version of the
    > 7410 above 1.4. Some of the machines with 7410s, and all of the
    > machines with 7400s have this problem, I believe.

    Is this bug restricted to 7400/7410 only, or does it affect the
    750 (and relatives) and 604/604e too?

    I'm thinking about ppc support for my perfctr driver, and whether
    overflow interrupts are worth supporting or not given the errata.

    /Mikael
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