Re: [PATCH 2.6.21-rt2] PowerPC: decrementer clockevent driver

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.

quoted

says that an exception is generated when the MSB transitions from 0

to

quoted

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.