Re: [Xenomai-help] Xenomai stop working

[马强 <ma.q@domain.hid>]

Hi, Gilles.

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

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

I used mxc_min_delay=16(2us) to do a test during last weekend, 
until now and no stall have happened again. So mxc_min_delay = 0x10 
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 = __raw_readl(timer_base + MX1_2_TCN) + delay;
			__raw_writel(tcmp, timer_base + MX1_2_TCMP);
		} else {
			tcmp = __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年3月9日 17:11
To: 马强
Cc: xenomai@xenomai.org
Subject: Re: [Xenomai-help] Xenomai stop working

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

-- 
                                                                Gilles.