Timer interrupt on Linux 3.0.3
vneethv at gmail.com
Mon Sep 26 19:11:56 EST 2011
there's a good news which is pretty bad. Good news is that we identified why
our processor timer not working. its because the TBEN in our board is pulled
LOW. which means the decrementer and the timebase registers wont work.
The board design cannot be changed !!! but we have an MPC107 connected with
our processor. Our plan is to use the timer of MPC107 and register our
timer_interrupt function with this timer interrupt. I think that's the only
workaround left now.
On Thu, Sep 22, 2011 at 11:52 AM, MohanReddy koppula <mohanreddykv at gmail.com
> I had the same issue with an MPC885 board. My kernel was 2.6.33. On
> that board decrementer exception was not working. I replaced the
> board, took new board (MPC885 only, just another board) and the same
> kernel worked fine. I don't know how the problem was solved.
> On 9/22/11, Scott Wood <scottwood at freescale.com> wrote:
> > On 09/21/2011 01:56 AM, Vineeth wrote:
> >>>> What was the issue? You really should try to make this work rather
> >>>> hack around it.
> >> what we found was the decrementer is not generating an exception when it
> >> becomes 0. and the timebase registers are not getting incremented too.
> > Does the decrementer actually tick until it reaches zero, or do it and
> > the timebase never tick?
> > Is the TBEN input to the CPU asserted?
> > -Scott
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