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    SubjectRe: [PATCH 2.6.21-rt2] PowerPC: decrementer clockevent driver
    >> Unfortunately, FIT exists only on Book E CPUs and MPC74xx aren't Book 
    >> E, IIUC.
    > By the name "FIT" perhaps, but MPC74xx has essentially
    > the same thing.

    > Set MMCR0[TBEE], set MMCR0[PMXE], and choose a TBL bit via
    > MMCR0[TBSEL].

    That's the performance monitor, which could very well be
    in use already (for performance monitoring stuff, who
    would have guessed).

    > It's also possible to trigger on the CPU cycle counter, but this would
    > cost one of the performance counters. MPC7400 has 4, later CPUs have 6
    > or more, and I think xPC7x0 had only 2.

    7xx has at least four as well.


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