Re: [Xenomai-help] High Latency on PXA

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

Felipe Castro wrote:
> I'm a little bit lost about this issues cause when running the xenomai
> 2.4.8 with the patch that you send me it worked, but with new version it
> doesn't work.
> Acctually i using the kernel 2.6.27 and i understand what you told me ,
> in version 2.4.9.1 there aren't a patch to this kernel version, neither
> xenomai 2.4.8.  :S

2.4.8 appeared to work, but it had a bug.
See https://mail.gna.org/public/xenomai-core/2009-08/msg00021.html

> 
> The problem is, I'm using a Voipac development kit, and the have only
> the kernel 2.6.27 BSP.
> 
> So , i tried to disable the float point emulation but the kernel didn't
> load OK .

It proves that your user-space support is compiled for hardware float,
but not PXA hardware floats. This is a pure waste of CPU power. See:

http://www.arm.linux.org.uk/mailinglists/faq.php#f3

Note that Xenomai applications compiled that way will not work either.

-- 
                                          Gilles