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    SubjectRe: [PATCH 2.6.21-rt2] PowerPC: decrementer clockevent driver
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    Date
    On Fri, 2007-05-18 at 17:41 +0400, Sergei Shtylyov wrote:
    > From the "PowerPC Operating Environment Architecture" that I've
    > already
    > quoated t follows that POWER4-compatible decremented exception *must*
    > be edge
    > triggered.
    >
    > > says that an exception is generated when the MSB transitions from 0
    > to
    > > 1. It's not clear wether the exception sticks while that bit is 1 or
    > is
    >
    > Freescale MPC 7450 manual says the same, for example.

    I find it extremely silly to implement it as edge anyway. The EE line is
    level triggered, and having a mix of edge and level on the same
    exception without a clean way to retrigger the DEC one other than
    waiting one tick is just causing trouble.

    Ben.


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