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Date: Tue, 13 Mar 2012 14:32:07 +0800
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Subject: Re: [Xenomai-help] Xenomai stop working
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To: 'Gilles Chanteperdrix' <gilles.chanteperdrix@xenomai.org>
Cc: xenomai@xenomai.org

Hi, Gilles.

I could not find "mxc_min_delay =3D 0xff" in linux source tree=20
and xenomai directory. mxc_min_delay comes from ipipe,=20
there is also no such statement in latest patch downloaded=20
from website.

If mxc_min_delay is 0xff, in my system this means 32us for 8MHz=20
ipipe tsc. For a real time system, It seems a little bit longer.

I used mxc_min_delay=3D16(2us) to do a test during last weekend,=20
until now and no stall have happened again. So mxc_min_delay =3D 0x10=20
maybe enough for my test CPU, I can't decide which value should be used.

The following code copy from the time.c file that patched by xenomai.
void __ipipe_mach_set_dec(unsigned long delay)
{
	if (delay > mxc_min_delay) {
		unsigned long tcmp;

		if (!timer_is_v2()) {
			tcmp =3D __raw_readl(timer_base + MX1_2_TCN) + delay;
			__raw_writel(tcmp, timer_base + MX1_2_TCMP);
		} else {
			tcmp =3D __raw_readl(timer_base + V2_TCN) + delay;
			__raw_writel(tcmp, timer_base + V2_TCMP);
		}
	} else
		ipipe_trigger_irq(__ipipe_mach_timerint);
}

My question is whether this function will be interrupted by other high =
priority interrupts.

--
																Ma.
-----Original Message-----
From: Gilles Chanteperdrix [mailto:gilles.chanteperdrix@xenomai.org
Sent: 2012=E5=B9=B43=E6=9C=889=E6=97=A5 17:11
To: =E9=A9=AC=E5=BC=BA
Cc: xenomai@xenomai.org
Subject: Re: [Xenomai-help] Xenomai stop working

You can try mxc_min_delay =3D 0xff, since it is what linux does in the
latest release.

--=20
                                                                Gilles.