From: xenophile <xenophile@piments.com>
To: xenomai@xenomai.org
Subject: Re: [Xenomai] "illegal instruction", then "rt_task_start()" error -38 (on a 486/no fpu)
Date: Mon, 04 Jun 2012 23:13:48 +0200 [thread overview]
Message-ID: <4FCD250C.4060401@piments.com> (raw)
In-Reply-To: <4FCD0C4D.6000004@xenomai.org>
On 06/04/12 21:28, Gilles Chanteperdrix wrote:
> On 06/04/2012 09:26 PM, Marc Le Douarain wrote:
>> Hello,
>>
>> I've some difficulties to run Xenomai with a little 'hello' example
>> (that create/start a task)
>> on a target 486 processor (without fpu).
>>
>> I successfully compiled the Linux kernel 2.6.38.8 with
>> adeos-ipipe-2.6.38.8-x86-2.11-02.patch (Xenomai version is 2.5.6)
>> (modify file xenomai-2.5.6/include/asm-x86/calibration.h
>> "current_cpu_data"->"cpu_info" were required)
>>
>> dmesg extract:
>> [ 0.000000] I-pipe 2.11-02: pipeline enabled.
>> ...
>> [ 0.140008] CPU: Cyrix Cx486SLC
>> ...
>> [ 1.440804] Xenomai: hal/i386 started.
>> [ 1.448804] Xenomai: scheduling class idle registered.
>> [ 1.452804] Xenomai: scheduling class rt registered.
>> [ 1.488806] Xenomai: real-time nucleus v2.5.6 (Wormhole Wizards) loaded.
>> [ 1.496807] Xenomai: starting native API services.
>> [ 1.500807] Xenomai: starting POSIX services.
>> [ 1.504807] Xenomai: starting RTDM services.
>>
>> After compiling user-space Xenomai part with
>> ./configure --disable-x86-sep --disable-x86-tsc / make / sudo make install
>> and copy /usr/xenomai/lib on the target
>> I've got "illegal instruction" with my little 'hello test' example that
>> create/start a task.
>>
>> Then I've tried to add flag to set 486 instruction set to gcc...
>> For that, to compile user-space this time I used :
>> ./configure CFLAGS="-march=i486" LDFLAGS="-march=i486" --disable-x86-sep
>> --disable-x86-tsc / make / sudo make install
>> Now, at rt_task_start, I've got an error code -38 !
>>
>> Any one have an idea on the trouble ?
>> (at start thinking on the fpu missing, but seems not to be used !? no
>> libm dependance)
>
> It may be due to the omit-frame-pointer option, please try adding
> -fno-omit-frame-pointer to the CFLAGS
>
>
It's a long way back now but I seem to recall some minor oddities on
some Cyrix/IBM chips.
Try building for 386 and see if it clears the problem.
HTH
next prev parent reply other threads:[~2012-06-04 21:13 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-04 19:26 [Xenomai] "illegal instruction", then "rt_task_start()" error -38 (on a 486/no fpu) Marc Le Douarain
2012-06-04 19:28 ` Gilles Chanteperdrix
2012-06-04 21:13 ` xenophile [this message]
2012-06-10 18:44 ` Marc Le Douarain
2012-06-10 20:09 ` Gilles Chanteperdrix
2012-06-10 20:19 ` xenophile
[not found] ` <4FD61BF8.9090901@laposte.net>
2012-06-11 17:09 ` Gilles Chanteperdrix
2012-06-17 19:05 ` Marc Le Douarain
2012-06-17 19:19 ` Gilles Chanteperdrix
2012-07-14 12:51 ` Marc Le Douarain
2012-06-10 21:00 ` Gilles Chanteperdrix
2012-06-04 19:49 ` Gilles Chanteperdrix
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