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
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