Messages in this thread | | | Date | Wed, 12 Mar 2003 00:30:58 +0100 | From | mikpe@csd ... | Subject | Re: [patch] oprofile for ppc |
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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.
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