From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Wed, 27 Aug 2014 17:45:43 +0200
From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
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Subject: Re: [Xenomai] ODROID-U3 porting problems
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To: GP Orcullo <kinsamanka@gmail.com>, xenomai@xenomai.org

On 08/27/2014 03:49 PM, GP Orcullo wrote:
> Hi,
> 
> I'm in the process of porting xenomai to Samsung Exynos 4420 based
> ODROID-U3 board. I've followed the online manual and I was able to finish
> up to the interrupt controller part.
> 
> So far everything works when booting the board with CONFIG_IPIPE and
> CONFIG_XENOMAI enabled. However, running the latency test gives the
> following results:
> 
> root@odroidu3:~# /usr/lib/xenomai/testsuite/latency -t 0 -T5
> == Sampling period: 1000 us
> == Test mode: periodic user-mode task
> == All results in microseconds
> warming up...
> RTT|  00:00:01  (periodic user-mode task, 1000 us period, priority 99)
> RTH|----lat min|----lat avg|----lat max|-overrun|---msw|---lat best|--lat worst
> RTD|-1054607.854|-555107.854|-416666.667|       0|
> 0|-1054607.854|-416666.667
> RTD|-2054607.854|-1555107.854|-416666.667|       0|
> 0|-2054607.854|-416666.667
> RTD|1240359.443|1739859.443|-416666.667|       0|     0|1240359.443|-416666.667
> RTD| 240359.443| 739859.443|-416666.667|       0|     0| 240359.443|-416666.667
> ---|-----------|-----------|-----------|--------|------|-------------------------
> RTS| 240359.443|-2055107.854|-416666.667|       0|     0|    00:00:05/00:00:05

I would say you have a problem with the tsc emulation. Have you tried to
run the "tsc" program?


> [    0.000000] Linux version 3.8.13.11-xen (gemi@odroidu3) (gcc version 4.6.3 (Debian 4.6.3-14) ) #34 SMP PREEMPT Wed Aug 27 20:22:46 SGT 2014 ()

3.8.13 is a bit old, I would advise you to use 3.14 if you plan to get
your changes merged.

> [    0.000000] Kernel was built at commit id ''
> [    0.000000] CPU: ARMv7 Processor [413fc090] revision 0 (ARMv7), cr=10c5387d

So, this is a cortex a9. On Cortex a9, Xenomai tries to use the global
timer for tsc emulation. Are you sure this processor has a global timer?
Again, running the "tsc" program will help you see if the tsc emulation
is working correctly.


-- 
                                                                Gilles.