On 10/12/07, Daniel Rossier <[EMAIL PROTECTED]> wrote:
> Jan Kiszka wrote:
> >  ROSSIER Daniel wrote:
> > > Hi everyone,
> > >
> > > I'm taking over the original thread from Patrick concerning the
> > > port of Xenomai on Xscale with Linux 2.6.20. Briefly summarized,
> > > the boot process actually freezes after a while right after the
> > > nucleus has been started.
> > >
> > > I've investigated the issue over the last hours, and I came up with
> > > the following conclusion: it seems that the problem is due to a
> > > endless loop in do_gettimeofday in arch/arm/kernel/time.c. Here is
> > > the code:
> > >
> > > "... do { seq = read_seqbegin_irqsave(&xtime_lock, flags); usec =
> > > system_timer->offset(); sec = xtime.tv_sec; usec += xtime.tv_nsec /
> > > 1000; } while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
> > > ..."
> > >
> > > If I remove the do { } while loop with the call to
> > > read_seqbegin_irqsave(), then the boot process is going ahead (I
> > > got a suspicious error like "I-pipe: Detected illicit call from
> > > domain 'Xenomai' " but it might well be normal with such a
> > > modification.
> >
> >  Please post the full oops about that "illicit call". It may point to
> >  an otherwise hidden invalid usage of Linux services over the Xenomai
> >  domain and explain the lock-up.
>
> Sure; here is the output message:
> "
> I-pipe: Detected illicit call from domain 'Xenomai'
>         into a service reserved for domain 'Linux' and below.
> [<c0027328>] (show_stack+0x0/0x40) from [<c005d590>]
> (ipipe_check_context+0x88/0xa4)
> [<c005d508>] (ipipe_check_context+0x0/0xa4) from [<c002d9e4>]
> (__ipipe_mach_set_dec+0x24/0x7c)
>  r5 = 54503BD0  r4 = 00003029
> [<c002d9c0>] (__ipipe_mach_set_dec+0x0/0x7c) from [<c00681e0>]
> (xntimer_do_tick_aperiodic+0x2f4/0x33c)
>  r4 = 00003029

This does not make sense, __ipipe_mach_set_dec is a very simple
function that should not trigger this illicit call.

-- 
                                               Gilles Chanteperdrix

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