On Fri, Oct 26, 2007 at 08:18:35AM +0200, Manuel Lauss wrote:
> Hi Ralf,
>
> On Thu, Oct 25, 2007 at 06:59:14PM +0100, Ralf Baechle wrote:
> > On Wed, Oct 24, 2007 at 08:31:35PM +0200, Manuel Lauss wrote:
> > > start_kernel()
> > > time_init()
> > > init_mips_clocksource()
> > > mips_clockevent_init()
> > > clockevents_register_device()
> > > clockevents_do_notify()
> > > notifier_call_chain():
> > >
> > > It dies here, line 69, in kernel/notifier.c:
> > > ret = nb->notifier_call(nb, val, v);
>
> > tick_notify(&tick_notifier, CLOCK_EVT_NOTIFY_ADD, dev)
> >
> > So things are likely going wrong somewhere in there.
>
> starting in nb->notifier_call:
> tick_notify()
> tick_check_new_device()
> tick_setup_device()
> tick_setup_periodic():
>
> it seems to enternally loop in here:
>
> 123 for (;;) {
> 124 if (!clockevents_program_event(dev, next, ktime_get()))
> 125 return;
> 126 next = ktime_add(next, tick_period);
> 127 }
>
> I think it's waiting for a timer irq which never happens. The code in
> cevt-r4k.c assigns IRQ 7 as the timer irq which is a GPIO according to
> the manual. Actually, there is no real requestable() timer irq mentioned
> in the manual (RTC and TOY aside).
That's wrong of course :(
The real reason is that mips_hpt_frequency is zero, the whole min/max delta
is therefore 2^31-1 and the loop above never exits because mips_next_event()
is called with zero for the 'delta' parameter.
Setting mips_hpt_frequency to processor speed gives me a booting kernel.
Sorry for the noise!
Thanks,
Manuel Lauss
