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Date: Tue, 26 Sep 2006 22:23:33 +0200
From: Wolfgang Grandegger <wg@domain.hid>
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Subject: Re: [Xenomai-core] Problem with periodic timer on PPC40x solved
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To: niklaus.giger@domain.hid
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Niklaus Giger wrote:
> Am Dienstag, 26. September 2006 18:28 schrieb Wolfgang Grandegger:
>> Philippe Gerum wrote:
>>> On Tue, 2006-09-26 at 16:56 +0200, gilles.chanteperdrix wrote:
>> OK, but in general, soft-float emulation should be used on systems
>> without FPU and this is even more important for real-time. This is a
>> tool chain issue. Niklaus, what tool chain are you using?
>>
> In my .config I have 
> MATH_EMULATION=y

You seem to need that because your compiler generates code with hard FP 
instructions. You could check this with:

  $ ppc-linux-objdump -d prog|egrep ":\s*[e-f]"

> The toolchain is gcc-3.4.4-glibc-2.3.5/powerpc-405-linux-gnu built using Dan 
> Kegel crosstool (Version 0.42 if I remember exactly).
> 
> Shall I switch to another one?

The ELDK from DENX uses FP soft-emulation for 4xx (http://www.denx.de).
Choose  v3.1.1 for Linux 2.4 and v4 for Linux 2.6.

Wolfgang.