From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Tue, 10 Apr 2012 13:25:56 +0200
From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
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Subject: Re: [Xenomai-core] preemptive doesn't work
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To: Roberto Bielli <roberto.bielli@domain.hid>
Cc: xenomai@xenomai.org

On 04/10/2012 12:39 PM, Roberto Bielli wrote:
> Hi Gilles,
> 
> i tried your code but th behavior is the same.
> 
> Then i tried a linux base app and works correctly.

The tsc physical address passed to user-space looks wrong.

void __ipipe_mach_get_tscinfo(struct __ipipe_tscinfo *info)
{
	info->type = IPIPE_TSC_TYPE_FREERUNNING;
	if (cpu_is_mx1()) {
#ifdef CONFIG_ARCH_MX1
		info->u.fr.counter = (unsigned *) (TIM1_BASE_ADDR + MX1_2_TCN);
#endif
	} else if (cpu_is_mx2()) {
#ifdef CONFIG_ARCH_MX2
		info->u.fr.counter = (unsigned *) (GPT1_BASE_ADDR + MX1_2_TCN);
#endif
	} else if (cpu_is_mx3() || cpu_is_mx25() ) {
#if defined CONFIG_ARCH_MX3 || defined CONFIG_ARCH_MX25
		info->u.fr.counter = (unsigned *) (GPT1_BASE_ADDR + MX3_TCN);
#endif
	}
	info->u.fr.mask = 0xffffffff;
	info->u.fr.tsc = &tsc->full;
}

Here cpu_is_mx2() will return true, and we will not go to cpu_is_mx25().

Are you using the tsc in user-space?

If you are passing --enable-arm-mach=mx2 to xenomai configure 
script, you are using the tsc in user-space, and it is a wonder 
how it works.

-- 
                                                                Gilles.