Re: [Xenomai] Kernel freezes in __ipipe_sync_stage

[Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>]

On 07/02/2014 06:36 PM, Marco Tessore wrote:
> ipipe_mach_allow_hwtimer_uaccess(MX25_AIPS1_BASE_ADDR_VIRT,MX25_AIPS2_BASE_ADDR_VIRT);
>      return 0;
> }
> 
> postcore_initcall(post_cpu_init);
> #endif /* CONFIG_IPIPE */
> 
> 
> the question that I kindly ask is: what should do the function 
> ipipe_mach_allow_hwtimer_uaccess?

As the name suggests, this function allows access to the hardware timer
registers from user-space. Xenomai user-space libraries require this,
unless you compile xenomai with --disable-arm-tsc, but this will
increase (greatly) the latency of services such as rt_timer_tsc or
clock_gettime(CLOCK_MONOTONIC) by requiring a system call.

And it probably has nothing to do with your problem.


-- 
                                                                Gilles.