[Xenomai] "illegal instruction", then "rt_task_start()" error -38 (on a 486/no fpu)

[Xenomai] "illegal instruction", then "rt_task_start()" error -38 (on a 486/no fpu)

[Marc Le Douarain]

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)

Many thanks.



Here my little hello_test example code used :
============================
#include <stdio.h>
#include <signal.h>
#include <unistd.h>
#include <sys/mman.h>

#include <native/task.h>
#include <native/timer.h>

RT_TASK task_desc;

static void task(void *arg)
{

     RTIME now,previous;

     rt_task_set_periodic( NULL, TM_NOW, 1000000000 );
     previous = rt_timer_read( );

     while( 1 )
     {
         rt_task_wait_period( NULL );
         now = rt_timer_read( );

           printf("Hello world xenomai test! %ld.%06ld ms\n", 
(long)(now-previous)/1000000, (long)(now-previous)%1000000 );
   /* Outch... printf accesses a Linux ressource so we are now
      in secondary mode */
     }
}

void catch_signal( int sig )
{
}

int main (void)
{
     int err;

printf("starting...\n");

   signal( SIGTERM,catch_signal );
   signal( SIGINT,catch_signal );

   /* disable memory swap */
   mlockall( MCL_CURRENT | MCL_FUTURE );

   err = rt_task_create( &task_desc, "demo_task", 0, 99, 0 );
   if (err!=0 )
   {
     printf("rt_task_create error : %d\n",err);
     return 1;
   }

   /* wait for task function termination */
   err = rt_task_start( &task_desc, &task, NULL );
   if (err!=0 )
   {
     printf("rt_task_start error : %d\n",err);
     return 1;
   }

   printf("running!\n");
   pause( );

   rt_task_delete( &task_desc );
   return 0;
}

And the Makefile :
===========
CFLAGS = -march=i486 -O2
LDFLAGS = -march=i486 -O2

CFLAGS += `/usr/xenomai/bin/xeno-config --skin=native --cflags`
LDFLAGS += `/usr/xenomai/bin/xeno-config --skin=native --ldflags`

all:
     gcc hello_test.c $(CFLAGS) $(LDFLAGS) -o hello_test

cflags:
     echo $(CFLAGS)

ldflags:
     echo $(LDFLAGS)

Re: [Xenomai] "illegal instruction", then "rt_task_start()" error -38 (on a 486/no fpu)

[Gilles Chanteperdrix]

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


-- 
                                                                Gilles.

Re: [Xenomai] "illegal instruction", then "rt_task_start()" error -38 (on a 486/no fpu)

[Gilles Chanteperdrix]

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)

The program may use fpu instructions without linking to libm. If you
want to be sure that there will be no fpu instructions, you should pass
-msoft-float. But I do not think the x86 compiler will generate fpu
instructions if you do not use floating point variables (but that
remains to be proved, the simpler way to know is to look at the
disassembly).


> void catch_signal( int sig )
> {
> }
> 
> int main (void)
> {
>      int err;
> 
> printf("starting...\n");
> 
>    signal( SIGTERM,catch_signal );
>    signal( SIGINT,catch_signal );

This looks like a bad idea. It means that if the user presses ctrl-C or
send a SIGTERM, nothing will happens. As a user, how much do you like
programs which do not react to ctrl-C? And anyway, you can not prevent
the user from sending a SIGKILL. So, catching SIGTERM and SIGINT this
way seems pointless.

-- 
                                                                Gilles.

Re: [Xenomai] "illegal instruction", then "rt_task_start()" error -38 (on a 486/no fpu)

[xenophile]

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

Re: [Xenomai] "illegal instruction", then "rt_task_start()" error -38 (on a 486/no fpu)

[Marc Le Douarain]

Le 04/06/2012 21:28, Gilles Chanteperdrix a écrit :
> 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.
> It may be due to the omit-frame-pointer option, please try adding
> -fno-omit-frame-pointer to the CFLAGS
Thanks for the tip,
now it seems to work correctly !
I've used the following command line to configure Xenomai user-part :
"./configure CFLAGS="-march=i486 -fno-omit-frame-pointer" 
LDFLAGS="-march=i486" --disable-x86-sep --disable-x86-tsc"

I've savagely modified latency.c, to avoid libm and double variables in 
the code,
and now when launching a 10millisecs period,
without load I've at worst about 170 microsecs, and best 90 microsecs.
and with load (dd if=/dev/zero of=/dev/null & telnet session while ls;do 
ls;done & ping -f) :
worst 200 microsecs, and best 110 microsecs.
For you, seems to be correct for an embedded equivalent 486 at 300 mhz ?
(Linux bogomips gives : 96.51)

Again, many thanks for the gcc optimize flag to avoid on it ! ;-)

Bye.

Re: [Xenomai] "illegal instruction", then "rt_task_start()" error -38 (on a 486/no fpu)

[Gilles Chanteperdrix]

On 06/10/2012 08:44 PM, Marc Le Douarain wrote:
> Le 04/06/2012 21:28, Gilles Chanteperdrix a écrit :
>> 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.
>> It may be due to the omit-frame-pointer option, please try adding
>> -fno-omit-frame-pointer to the CFLAGS
> Thanks for the tip,
> now it seems to work correctly !
> I've used the following command line to configure Xenomai user-part :
> "./configure CFLAGS="-march=i486 -fno-omit-frame-pointer" 
> LDFLAGS="-march=i486" --disable-x86-sep --disable-x86-tsc"
> 
> I've savagely modified latency.c, to avoid libm and double variables in 
> the code,

You probably can use double variable, but you have to compile with
-msoft-float.

> and now when launching a 10millisecs period,
> without load I've at worst about 170 microsecs, and best 90 microsecs.
> and with load (dd if=/dev/zero of=/dev/null & telnet session while ls;do 
> ls;done & ping -f) :
> worst 200 microsecs, and best 110 microsecs.
> For you, seems to be correct for an embedded equivalent 486 at 300 mhz ?
> (Linux bogomips gives : 96.51)
> 
> Again, many thanks for the gcc optimize flag to avoid on it ! ;-)

When using the 8254 as clocksource, and PIT as timer, the atom I have
gets crappy latencies (the 8254 tsc can not be used in user-space, so,
for instance the call to rt_timer_tsc in latency leads to a syscall, and
the 8254 itself is read through the ISA bus, which is pretty slow). So,
I am not surprised that you get poor latencies on this processor. And
according to what I read, a cyrix 486SLC runs at frequencies under
60MHz, not 300 MHz, which the 96.51 bogomips confirms.

> 
> Bye.
> 
> 
> _______________________________________________
> Xenomai mailing list
> Xenomai@xenomai.org
> http://www.xenomai.org/mailman/listinfo/xenomai


-- 
                                                                Gilles.

Re: [Xenomai] "illegal instruction", then "rt_task_start()" error -38 (on a 486/no fpu)

[xenophile]

On 06/10/12 22:09, Gilles Chanteperdrix wrote:
>   And
> according to what I read, a cyrix 486SLC runs at frequencies under
> 60MHz, not 300 MHz, which the 96.51 bogomips confirms.

Yes, that sort of bogomips figure does not seem anything near what I 
would expect at 300 MHz.

Maybe you should check your into on clock freq.

;)

Re: [Xenomai] "illegal instruction", then "rt_task_start()" error -38 (on a 486/no fpu)

[Gilles Chanteperdrix]

On 06/10/2012 08:44 PM, Marc Le Douarain wrote:
> Le 04/06/2012 21:28, Gilles Chanteperdrix a écrit :
>> 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.
>> It may be due to the omit-frame-pointer option, please try adding
>> -fno-omit-frame-pointer to the CFLAGS
> Thanks for the tip,
> now it seems to work correctly !
> I've used the following command line to configure Xenomai user-part :
> "./configure CFLAGS="-march=i486 -fno-omit-frame-pointer" 
> LDFLAGS="-march=i486" --disable-x86-sep --disable-x86-tsc"
> 
> I've savagely modified latency.c, to avoid libm and double variables in 
> the code,

As far as I can tell, the only reason we use libm is for sqrt. So, you
can use libm for floating points, and replace sqrt with a simple
newton-method base implementation.

-- 
                                                                Gilles.

Re: [Xenomai] "illegal instruction", then "rt_task_start()" error -38 (on a 486/no fpu)

[Gilles Chanteperdrix]

On 06/11/2012 06:25 PM, Marc Le Douarain wrote:
> Le 10/06/2012 22:09, Gilles Chanteperdrix a écrit :
>> On 06/10/2012 08:44 PM, Marc Le Douarain wrote:
>>> Le 04/06/2012 21:28, Gilles Chanteperdrix a écrit :
>>>> 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.
>>>> It may be due to the omit-frame-pointer option, please try adding
>>>> -fno-omit-frame-pointer to the CFLAGS
>>> Thanks for the tip,
>>> now it seems to work correctly !
>>> I've used the following command line to configure Xenomai user-part :
>>> "./configure CFLAGS="-march=i486 -fno-omit-frame-pointer"
>>> LDFLAGS="-march=i486" --disable-x86-sep --disable-x86-tsc"
>>>
>>> I've savagely modified latency.c, to avoid libm and double variables in
>>> the code,
>> You probably can use double variable, but you have to compile with
>> -msoft-float.
>>
>>> and now when launching a 10millisecs period,
>>> without load I've at worst about 170 microsecs, and best 90 microsecs.
>>> and with load (dd if=/dev/zero of=/dev/null&  telnet session while ls;do
>>> ls;done&  ping -f) :
>>> worst 200 microsecs, and best 110 microsecs.
>>> For you, seems to be correct for an embedded equivalent 486 at 300 mhz ?
>>> (Linux bogomips gives : 96.51)
>>>
>>> Again, many thanks for the gcc optimize flag to avoid on it ! ;-)
>> When using the 8254 as clocksource, and PIT as timer, the atom I have
>> gets crappy latencies (the 8254 tsc can not be used in user-space, so,
>> for instance the call to rt_timer_tsc in latency leads to a syscall, and
>> the 8254 itself is read through the ISA bus, which is pretty slow). So,
>> I am not surprised that you get poor latencies on this processor. And
>> according to what I read, a cyrix 486SLC runs at frequencies under
>> 60MHz, not 300 MHz, which the 96.51 bogomips confirms.
>> And Xenophile:
>> "Yes, that sort of bogomips figure does not seem anything near what I
>> would expect at 300 MHz.
>> Maybe you should check your into on clock freq."
> In fact, it is a SoC by DM&P: a Vortex86SX at 300 mhz
> ( verified in the BIOS, if no "divide per" activated per error ;-) )
> I think the latency is just enough precise for 2 tasks about 5>30 
> milli-secs, that would read/filter some inputs, and drive outputs to do 
> a basic programmable logic controller... we are not about 0,1 milli-secs...
> About BogoMips, here at http://en.wikipedia.org/wiki/BogoMips, it is 
> written "clock x 0.34" to obtain it for a Cyrix/IBM 486, so 300 mhz -> 
> 100 it is near...
> (it is "clock x 1.00" on 586/Pentium!!!)

I think vortex86sx has a tsc, so, you should try and modify the linux
kernel configuration to select  CONFIG_X86_TSC, or simply select a
processor which has a tsc. You will get better latencies.

-- 
					    Gilles.

Re: [Xenomai] "illegal instruction", then "rt_task_start()" error -38 (on a 486/no fpu)

[Marc Le Douarain]

Le 11/06/2012 19:09, Gilles Chanteperdrix a écrit :
> I think vortex86sx has a tsc, so, you should try and modify the linux
> kernel configuration to select  CONFIG_X86_TSC, or simply select a
> processor which has a tsc. You will get better latencies.
>
I've made two more tests:
- compiling for Pentium-Classic (M586-TSC)
=> Kernel doesn't boot at all
(I've seen invalid opcode, and after I-pipe stack call-trace 
ftrace_make_nop)

- modifying arch/x86/Kconfig.cpu (there isn't any M486-TSC ! and X86-TSC 
can't be acceded directly!?)
   in config X86_TSC, adding for depends on M486
=> But also kernel not working.

I'm finally not sure if there is a TSC available in the Vortex86sx,
perhaps only on the Vortex86dx (fpu difference only normally),
or none !?

Here with my previous 486 kernel, what gives /proc/cpuinfo:
processor       : 0
vendor_id       : CyrixInstead
cpu family      : 4
model           : 1
model name      : Cx486SLC
stepping        : unknown
fdiv_bug        : yes
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : no
fpu_exception   : no
cpuid level     : -1
wp              : yes
flags           :
bogomips        : 96.51
clflush size    : 32
cache_alignment : 32
address sizes   : 32 bits physical, 32 bits virtual
power management:


If could be interesting, here the kernel messages with my 486 + X86_TSC 
kernel:
(we can see strange frequency detected by Xenomai before inits failures)

[    0.000000] Linux version 2.6.38.8-xeno_mld (marc@marc-laptop-airis) 
(gcc version 4.6.1 (Ubuntu/Linaro 4.6.1-9ubuntu3) ) #9 Sun Jun 17 
14:42:40 CEST 2012
[    0.000000] BIOS-provided physical RAM map:
[    0.000000]  BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
[    0.000000]  BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
[    0.000000]  BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved)
[    0.000000]  BIOS-e820: 0000000000100000 - 0000000008000000 (usable)
[    0.000000]  BIOS-e820: 00000000ff000000 - 0000000100000000 (reserved)
[    0.000000] Notice: NX (Execute Disable) protection missing in CPU!
[    0.000000] DMI not present or invalid.
[    0.000000] last_pfn = 0x8000 max_arch_pfn = 0x100000
[    0.000000] init_memory_mapping: 0000000000000000-0000000008000000
[    0.000000] 0MB HIGHMEM available.
[    0.000000] 128MB LOWMEM available.
[    0.000000]   mapped low ram: 0 - 08000000
[    0.000000]   low ram: 0 - 08000000
[    0.000000] Zone PFN ranges:
[    0.000000]   DMA      0x00000010 -> 0x00001000
[    0.000000]   Normal   0x00001000 -> 0x00008000
[    0.000000]   HighMem  empty
[    0.000000] Movable zone start PFN for each node
[    0.000000] early_node_map[2] active PFN ranges
[    0.000000]     0: 0x00000010 -> 0x0000009f
[    0.000000]     0: 0x00000100 -> 0x00008000
[    0.000000] Allocating PCI resources starting at 8000000 (gap: 
8000000:f7000000)
[    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  
Total pages: 32399
[    0.000000] Kernel command line: root=/dev/sda2 console=tty1 
console=ttyS0,115200n8 BOOT_IMAGE=kernxeno
[    0.000000] PID hash table entries: 512 (order: -1, 2048 bytes)
[    0.000000] Dentry cache hash table entries: 16384 (order: 4, 65536 
bytes)
[    0.000000] Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
[    0.000000] Initializing CPU#0
[    0.000000] allocated 655040 bytes of page_cgroup
[    0.000000] please try 'cgroup_disable=memory' option if you don't 
want memory cgroups
[    0.000000] Initializing HighMem for node 0 (00000000:00000000)
[    0.000000] Memory: 120672k/131072k available (4078k kernel code, 
9948k reserved, 2447k data, 488k init, 0k highmem)
[    0.000000] virtual kernel memory layout:
[    0.000000]     fixmap  : 0xfffe4000 - 0xfffff000   ( 108 kB)
[    0.000000]     pkmap   : 0xff800000 - 0xffc00000   (4096 kB)
[    0.000000]     vmalloc : 0xc8800000 - 0xff7fe000   ( 879 MB)
[    0.000000]     lowmem  : 0xc0000000 - 0xc8000000   ( 128 MB)
[    0.000000]       .init : 0xc1660000 - 0xc16da000   ( 488 kB)
[    0.000000]       .data : 0xc13fbaf2 - 0xc165fac0   (2447 kB)
[    0.000000]       .text : 0xc1000000 - 0xc13fbaf2   (4078 kB)
[    0.000000] Checking if this processor honours the WP bit even in 
supervisor mode...Ok.
[    0.000000] SLUB: Genslabs=15, HWalign=32, Order=0-3, MinObjects=0, 
CPUs=1, Nodes=1
[    0.000000] NR_IRQS:16 nr_irqs:16 16
[    0.000000] I-pipe 2.11-02: pipeline enabled.
[    0.000000] Console: colour dummy device 80x25
[    0.000000] console [tty1] enabled
[    0.000000] console [ttyS0] enabled
[    0.008000] Calibrating delay loop... 96.25 BogoMIPS (lpj=192512)
[    0.084004] pid_max: default: 32768 minimum: 301
[    0.092004] Security Framework initialized
[    0.096005] AppArmor: AppArmor initialized
[    0.104005] Mount-cache hash table entries: 512
[    0.112006] Initializing cgroup subsys cpuacct
[    0.116006] Initializing cgroup subsys memory
[    0.124007] Initializing cgroup subsys devices
[    0.128007] Initializing cgroup subsys freezer
[    0.132007] Initializing cgroup subsys net_cls
[    0.136007] Initializing cgroup subsys blkio
[    0.144008] CPU: Cyrix Cx486SLC
[    0.148008] Checking 'hlt' instruction... OK.
[    0.168009] ftrace: allocating 17291 entries in 34 pages
[    0.188011] Performance Events:
[    0.272016] NET: Registered protocol family 16
[    0.280016] EISA bus registered
[    0.296017] PCI: PCI BIOS revision 3.00 entry at 0xf0031, last bus=0
[    0.300018] PCI: Using configuration type 1 for base access
[    0.376022] bio: create slab <bio-0> at 0
[    0.384023] vgaarb: loaded
[    0.396024] SCSI subsystem initialized
[    0.404024] usbcore: registered new interface driver usbfs
[    0.408024] usbcore: registered new interface driver hub
[    0.416025] usbcore: registered new device driver usb
[    0.424025] PCI: Probing PCI hardware
[    0.448027] pci 0000:00:07.0: default IRQ router [17f3:6031]
[    0.452027] pci 0000:00:0a.0: address space collision: [mem 
0x000e2000-0x000e2fff] conflicts with reserved [mem 0x000e0000-0x000fffff]
[    0.456027] pci 0000:00:0a.1: address space collision: [mem 
0x000e3000-0x000e30ff] conflicts with reserved [mem 0x000e0000-0x000fffff]
[    0.460028] pci 0000:00:0b.0: address space collision: [mem 
0x000e0000-0x000e0fff] conflicts with reserved [mem 0x000e0000-0x000fffff]
[    0.464028] pci 0000:00:0b.1: address space collision: [mem 
0x000e1000-0x000e10ff] conflicts with reserved [mem 0x000e0000-0x000fffff]
[    0.472028] NetLabel: Initializing
[    0.476029] NetLabel:  domain hash size = 128
[    0.480029] NetLabel:  protocols = UNLABELED CIPSOv4
[    0.484029] NetLabel:  unlabeled traffic allowed by default
[    0.488029] Switching to clocksource pit
[    0.914581] AppArmor: AppArmor Filesystem Enabled
[    0.922561] PnPBIOS: Scanning system for PnP BIOS support...
[    0.929492] PnPBIOS: Found PnP BIOS installation structure at 0xc00f3be0
[    0.933086] PnPBIOS: PnP BIOS version 1.0, entry 0xf0000:0x45aa, dseg 
0xf0000
[    0.938563] system 00:00: [mem 0x00000000-0x0009fbff] could not be 
reserved
[    0.943898] system 00:00: [mem 0x0009fc00-0x0009ffff] could not be 
reserved
[    0.947569] system 00:00: [mem 0x000e0000-0x000fffff] could not be 
reserved
[    0.951234] system 00:00: [mem 0x00100000-0x07ffffff] could not be 
reserved
[    0.954899] system 00:00: [mem 0xff000000-0xffffffff] has been reserved
[    0.974613] system 00:08: [io  0x04d0-0x04d1] has been reserved
[    0.979824] system 00:08: [io  0x0cf8-0x0cff] could not be reserved
[    0.982805] system 00:08: [io  0xfc00-0xfc0f] has been reserved
[    0.989400] system 00:08: [io  0x0a00-0x0a0f] has been reserved
[    0.991984] system 00:08: [io  0x0a20-0x0a2f] has been reserved
[    0.994600] system 00:08: [io  0x0a10-0x0a1f] has been reserved
[    1.001249] system 00:08: [io  0x0a30-0x0a3f] has been reserved
[    1.003837] system 00:08: [io  0x0a40-0x0a4f] has been reserved
[    1.010569] system 00:08: [io  0x0a50-0x0a5f] has been reserved
[    1.026579] system 00:0c: [io  0x0a60-0x0a6f] has been reserved
[    1.034694] pnp 00:0d: disabling [io  0x03f0-0x03f5] because it 
overlaps 0000:00:0c.0 BAR 1 [io  0x03f4-0x03f7]
[    1.038884] PnPBIOS: 15 nodes reported by PnP BIOS; 15 recorded by driver
[    1.110586] pci 0000:00:0c.0: BAR 6: assigned [mem 
0x08000000-0x0801ffff pref]
[    1.118013] pci 0000:00:0a.0: BAR 0: assigned [mem 0x08020000-0x08020fff]
[    1.121509] pci 0000:00:0a.0: BAR 0: set to [mem 
0x08020000-0x08020fff] (PCI address [0x8020000-0x8020fff])
[    1.124114] pci 0000:00:0b.0: BAR 0: assigned [mem 0x08021000-0x08021fff]
[    1.127596] pci 0000:00:0b.0: BAR 0: set to [mem 
0x08021000-0x08021fff] (PCI address [0x8021000-0x8021fff])
[    1.134201] pci 0000:00:0a.1: BAR 0: assigned [mem 0x08022000-0x080220ff]
[    1.137710] pci 0000:00:0a.1: BAR 0: set to [mem 
0x08022000-0x080220ff] (PCI address [0x8022000-0x80220ff])
[    1.140310] pci 0000:00:0b.1: BAR 0: assigned [mem 0x08022100-0x080221ff]
[    1.143788] pci 0000:00:0b.1: BAR 0: set to [mem 
0x08022100-0x080221ff] (PCI address [0x8022100-0x80221ff])
[    1.150560] NET: Registered protocol family 2
[    1.156919] IP route cache hash table entries: 1024 (order: 0, 4096 
bytes)
[    1.166597] TCP established hash table entries: 4096 (order: 3, 32768 
bytes)
[    1.171227] TCP bind hash table entries: 4096 (order: 2, 16384 bytes)
[    1.175192] TCP: Hash tables configured (established 4096 bind 4096)
[    1.178652] TCP reno registered
[    1.178652] UDP hash table entries: 256 (order: 0, 4096 bytes)
[    1.184609] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
[    1.187610] NET: Registered protocol family 1
[    1.198597] audit: initializing netlink socket (disabled)
[    1.206724] type=2000 audit(1339944309.204:1): initialized
[    1.438622] Xenomai has detected a CPU frequency of 0. Aborting.
[    1.446655] Xenomai: system init failed, code -19.
[    1.451993] Xenomai: native skin init failed, code -19.
[    1.457796] Xenomai: starting POSIX services.
[    1.458692] Xenomai: POSIX skin init failed, code -19.
[    1.464382] Xenomai: RTDM skin init failed, code -19.
[    1.590614] VFS: Disk quotas dquot_6.5.2
[    1.598624] Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
[    1.622626] NTFS driver 2.1.30 [Flags: R/O].
[    1.630604] fuse init (API version 7.16)
[    1.638628] msgmni has been set to 235
[    1.662636] Block layer SCSI generic (bsg) driver version 0.4 loaded 
(major 253)
[    1.667904] io scheduler noop registered
[    1.673944] io scheduler deadline registered
[    1.674840] io scheduler cfq registered (default)
[    1.682609] isapnp: Scanning for PnP cards...
[    2.050606] isapnp: No Plug & Play device found
[    3.194715] Serial: 8250/16550 driver, 12 ports, IRQ sharing enabled
[    3.207294] serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
[    3.223603] serial8250: ttyS2 at I/O 0x3e8 (irq = 4) is a 16550A
[    3.237021] serial8250: ttyS3 at I/O 0x2e8 (irq = 3) is a 16550A
[    3.279379] 00:09: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
[    3.297701] 00:0a: ttyS2 at I/O 0x3e8 (irq = 10) is a 16550A
[    3.312118] 00:0b: ttyS3 at I/O 0x2e8 (irq = 11) is a 16550A
[    3.378725] brd: module loaded
[    3.410729] loop: module loaded
[    3.434736] scsi0 : pata_it821x
[    3.442725] scsi1 : pata_it821x
[    3.447508] ata1: PATA max MWDMA2 cmd 0x1f0 ctl 0x3f4 bmdma 0xfff0 irq 14
[    3.452870] ata2: PATA max MWDMA2 cmd 0x170 ctl 0x374 bmdma 0xfff8 irq 14
[    3.486714] Fixed MDIO Bus: probed
[    3.494704] r6040: RDC R6040 NAPI net driver,version 0.28 (07Oct2011)
[    3.514698] r6040_eth_mii: probed
[    3.519193] r6040 0000:00:08.0: attached PHY driver [Generic PHY] 
(mii_bus:phy_addr=0000:00:08.0-0:01)
[    3.530740] PPP generic driver version 2.4.2
[    3.538688] tun: Universal TUN/TAP device driver, 1.6
[    3.542763] tun: (C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>
[    3.550721] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    3.557673] ehci_hcd 0000:00:0a.1: EHCI Host Controller
[    3.562736] ehci_hcd 0000:00:0a.1: new USB bus registered, assigned 
bus number 1
[    3.590727] ehci_hcd 0000:00:0a.1: irq 5, io mem 0x08022000
[    3.606728] ehci_hcd 0000:00:0a.1: USB 2.0 started, EHCI 1.00
[    3.614731] hub 1-0:1.0: USB hub found
[    3.622700] hub 1-0:1.0: 2 ports detected
[    3.628965] ata1.00: CFA: InnoDisk Corp. - iCF4000 512MB, 100511B, 
max UDMA/66
[    3.633922] ata1.00: 1009008 sectors, multi 0: LBA
[    3.635377] ata1.00: configured for MWDMA2
[    3.642731] scsi 0:0:0:0: Direct-Access     ATA      InnoDisk Corp. - 
1005 PQ: 0 ANSI: 5
[    3.647019] ehci_hcd 0000:00:0b.1: EHCI Host Controller
[    3.654801] sd 0:0:0:0: Attached scsi generic sg0 type 0
[    3.659914] sd 0:0:0:0: [sda] 1009008 512-byte logical blocks: (516 
MB/492 MiB)
[    3.666735] ehci_hcd 0000:00:0b.1: new USB bus registered, assigned 
bus number 2
[    3.678761] sd 0:0:0:0: [sda] Write Protect is off
[    3.686731] sd 0:0:0:0: [sda] Write cache: disabled, read cache: 
enabled, doesn't support DPO or FUA
[    3.702758] ehci_hcd 0000:00:0b.1: irq 9, io mem 0x08022100
[    3.714835] invalid opcode: 0000 [#1]
[    3.714835] last sysfs file:
[    3.714835] Modules linked in:
[    3.714835]
[    3.714835] Pid: 3, comm: ksoftirqd/0 Not tainted 2.6.38.8-xeno_mld #9
[    3.714835] EIP: 0060:[<c1276b3c>] EFLAGS: 00000287 CPU: 0
[    3.714835] EIP is at add_timer_randomness+0x3c/0xf0
[    3.714835] EAX: fffedea9 EBX: c79cfac0 ECX: 00800100 EDX: 00800100
[    3.714835] ESI: 00000000 EDI: 00000000 EBP: c780becc ESP: c780beb4
[    3.714835]  DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068
[    3.714835] Process ksoftirqd/0 (pid: 3, ti=c780a000 task=c7849900 
task.ti=c7858000)
[    3.714835] I-pipe domain Linux
[    3.714835] Stack:
[    3.714835]  00000000 00000000 c7a023a0 fffedea9 00001000 c7a023a0 
c780bed4 c12773d9
[    3.714835]  c780bee8 c1211f90 00000000 c7a023a0 00000000 c780befc 
c1212171 00000000
[    3.714835]  c780ea00 c7a023a0 c780bf50 c12910d0 fffffff1 c780007b 
c102007b c7840000
[    3.714835] Call Trace:
[    3.714835]  [<c12773d9>] add_disk_randomness+0x29/0x30
[    3.714835]  [<c1211f90>] blk_update_bidi_request+0x60/0x80
[    3.714835]  [<c1212171>] blk_end_request+0x21/0x50
[    3.714835]  [<c12910d0>] scsi_io_completion+0x90/0x520
[    3.714835]  [<c102007b>] ? __enqueue_entity+0xb/0xc0
[    3.714835]  [<c1086e74>] ? __xirq_end+0x0/0x3c
[    3.714835]  [<c10873fd>] ? __ipipe_restore_root+0x1d/0x30
[    3.714835]  [<c12883ca>] scsi_finish_command+0x9a/0xf0
[    3.714835]  [<c128e404>] ? scsi_decide_disposition+0x184/0x1b0
[    3.714835]  [<c1290f78>] scsi_softirq_done+0x118/0x140
[    3.714835]  [<c10362e0>] ? __do_softirq+0x0/0x190
[    3.714835]  [<c1216f88>] blk_done_softirq+0x68/0x80
[    3.714835]  [<c1036358>] __do_softirq+0x78/0x190
[    3.714835]  [<c1003069>] ? common_interrupt+0x29/0x40
[    3.714835]  [<c1036690>] ? raise_softirq+0xc0/0xd0
[    3.714835]  [<c10362e0>] ? __do_softirq+0x0/0x190
[    3.714835] <IRQ>
[    3.714835]  [<c1036545>] ? irq_exit+0x65/0x70
[    3.714835]  [<c13faab8>] ? do_IRQ+0x48/0x94
[    3.714835]  [<c1036517>] ? irq_exit+0x37/0x70
[    3.714835]  [<c13faab8>] ? do_IRQ+0x48/0x94
[    3.714835]  [<c1086e6f>] ? __ipipe_sync_stage+0xef/0xf4
[    3.714835]  [<c13faa70>] ? do_IRQ+0x0/0x94
[    3.714835]  [<c1086e74>] ? __xirq_end+0x0/0x3c
[    3.714835]  [<c10873d2>] ? __ipipe_unstall_root+0x22/0x30
[    3.714835]  [<c10222ef>] ? finish_task_switch.isra.145+0x2f/0x80
[    3.714835]  [<c13f2cc7>] ? schedule+0x2f7/0x6a0
[    3.714835]  [<c13f2cc7>] ? schedule+0x2f7/0x6a0
[    3.714835]  [<c10237d0>] ? default_wake_function+0x10/0x20
[    3.714835]  [<c102517b>] ? __cond_resched+0x1b/0x30
[    3.714835]  [<c13f3179>] ? _cond_resched+0x29/0x30
[    3.714835]  [<c1035a75>] ? run_ksoftirqd+0x55/0xc0
[    3.714835]  [<c1035a20>] ? run_ksoftirqd+0x0/0xc0
[    3.714835]  [<c104b66c>] ? kthread+0x6c/0x80
[    3.714835]  [<c104b600>] ? kthread+0x0/0x80
[    3.714835]  [<c1003086>] ? kernel_thread_helper+0x6/0x10
[    3.714835] Code: 65 c1 89 d1 39 05 38 36 64 c1 7e 17 b8 01 00 00 00 
0f c1 05 4c 36 64 c1 a9 ff 0f 00 00 0f 85 9f 00 00 00 a1 c8 ac 61 c1 89 
45 f4 <0f> 31 89 45 ec b8 20 36 64 c1 89 55 f0 8d 55 ec 89 4d f8 b9 10
[    3.714835] EIP: [<c1276b3c>] add_timer_randomness+0x3c/0xf0 SS:ESP 
0068:c780beb4
[    3.720096] ---[ end trace c0c72ecfd80ce698 ]---
[    3.725356] Kernel panic - not syncing: Fatal exception in interrupt
[    3.728275] Pid: 3, comm: ksoftirqd/0 Tainted: G      D     
2.6.38.8-xeno_mld #9
[    3.732379] Call Trace:
[    3.735254]  [<c13ee18c>] ? panic+0x5c/0x145
[    3.740104]  [<c13f56c9>] ? oops_end+0xb9/0xc0
[    3.745142]  [<c10050d4>] ? die+0x54/0x80
[    3.749729]  [<c13f4e86>] ? do_trap+0x96/0xd0
[    3.754802]  [<c100333b>] ? do_invalid_op+0x8b/0xa0
[    3.760264]  [<c1276b3c>] ? add_timer_randomness+0x3c/0xf0
[    3.766369]  [<c104ba49>] ? wake_bit_function+0x59/0x60
[    3.768226]  [<c101eff7>] ? __wake_up_common+0x47/0x70
[    3.773966]  [<c10873fd>] ? __ipipe_restore_root+0x1d/0x30
[    3.776067]  [<c110cbdf>] ? kmem_cache_free+0xcf/0xf0
[    3.781718]  [<c10e07b3>] ? mempool_free_slab+0x13/0x20
[    3.783550]  [<c10e07b3>] ? mempool_free_slab+0x13/0x20
[    3.789388]  [<c10e0a2d>] ? mempool_free+0x5d/0xe0
[    3.790791]  [<c10151f8>] ? __ipipe_handle_exception+0xc8/0x240
[    3.797334]  [<c1142f6c>] ? bio_free+0x4c/0x50
[    3.802386]  [<c13f4bed>] ? error_code+0x5d/0x70
[    3.803623]  [<c1210000>] ? ftrace_define_fields_block_bio+0x50/0x1b0
[    3.806739]  [<c1276b3c>] ? add_timer_randomness+0x3c/0xf0
[    3.812857]  [<c12773d9>] ? add_disk_randomness+0x29/0x30
[    3.814899]  [<c1211f90>] ? blk_update_bidi_request+0x60/0x80
[    3.821265]  [<c1212171>] ? blk_end_request+0x21/0x50
[    3.822927]  [<c12910d0>] ? scsi_io_completion+0x90/0x520
[    3.828932]  [<c102007b>] ? __enqueue_entity+0xb/0xc0
[    3.834728]  [<c1086e74>] ? __xirq_end+0x0/0x3c
[    3.839841]  [<c10873fd>] ? __ipipe_restore_root+0x1d/0x30
[    3.845948]  [<c12883ca>] ? scsi_finish_command+0x9a/0xf0
[    3.847995]  [<c128e404>] ? scsi_decide_disposition+0x184/0x1b0
[    3.854758]  [<c1290f78>] ? scsi_softirq_done+0x118/0x140
[    3.860751]  [<c10362e0>] ? __do_softirq+0x0/0x190
[    3.866151]  [<c1216f88>] ? blk_done_softirq+0x68/0x80
[    3.867905]  [<c1036358>] ? __do_softirq+0x78/0x190
[    3.873391]  [<c1003069>] ? common_interrupt+0x29/0x40
[    3.875119]  [<c1036690>] ? raise_softirq+0xc0/0xd0
[    3.880593]  [<c10362e0>] ? __do_softirq+0x0/0x190
[    3.885983] <IRQ>  [<c1036545>] ? irq_exit+0x65/0x70
[    3.891845]  [<c13faab8>] ? do_IRQ+0x48/0x94
[    3.896718]  [<c1036517>] ? irq_exit+0x37/0x70
[    3.901745]  [<c13faab8>] ? do_IRQ+0x48/0x94
[    3.906743]  [<c1086e6f>] ? __ipipe_sync_stage+0xef/0xf4
[    3.912666]  [<c13faa70>] ? do_IRQ+0x0/0x94
[    3.917445]  [<c1086e74>] ? __xirq_end+0x0/0x3c
[    3.922712]  [<c10873d2>] ? __ipipe_unstall_root+0x22/0x30
[    3.928810]  [<c10222ef>] ? finish_task_switch.isra.145+0x2f/0x80
[    3.931563]  [<c13f2cc7>] ? schedule+0x2f7/0x6a0
[    3.936787]  [<c13f2cc7>] ? schedule+0x2f7/0x6a0
[    3.942007]  [<c10237d0>] ? default_wake_function+0x10/0x20
[    3.944257]  [<c102517b>] ? __cond_resched+0x1b/0x30
[    3.949879]  [<c13f3179>] ? _cond_resched+0x29/0x30
[    3.951354]  [<c1035a75>] ? run_ksoftirqd+0x55/0xc0
[    3.956831]  [<c1035a20>] ? run_ksoftirqd+0x0/0xc0
[    3.962217]  [<c104b66c>] ? kthread+0x6c/0x80
[    3.963158]  [<c104b600>] ? kthread+0x0/0x80
[    3.968012]  [<c1003086>] ? kernel_thread_helper+0x6/0x10

Re: [Xenomai] "illegal instruction", then "rt_task_start()" error -38 (on a 486/no fpu)

[Gilles Chanteperdrix]

On 06/17/2012 09:05 PM, Marc Le Douarain wrote:
> Le 11/06/2012 19:09, Gilles Chanteperdrix a écrit :
>> I think vortex86sx has a tsc, so, you should try and modify the linux
>> kernel configuration to select  CONFIG_X86_TSC, or simply select a
>> processor which has a tsc. You will get better latencies.
>>
> I've made two more tests:
> - compiling for Pentium-Classic (M586-TSC)
> => Kernel doesn't boot at all
> (I've seen invalid opcode, and after I-pipe stack call-trace 
> ftrace_make_nop)
> 
> - modifying arch/x86/Kconfig.cpu (there isn't any M486-TSC ! and X86-TSC 
> can't be acceded directly!?)
>    in config X86_TSC, adding for depends on M486
> => But also kernel not working.
> 
> I'm finally not sure if there is a TSC available in the Vortex86sx,
> perhaps only on the Vortex86dx (fpu difference only normally),
> or none !?

Someone on this list claimed that vortex86sx may have a tsc:
http://www.xenomai.org/pipermail/xenomai-help/2010-01/msg00153.html

I do not know for sure however.

> 
> Here with my previous 486 kernel, what gives /proc/cpuinfo:
> processor       : 0
> vendor_id       : CyrixInstead
> cpu family      : 4
> model           : 1
> model name      : Cx486SLC
> stepping        : unknown
> fdiv_bug        : yes
> hlt_bug         : no
> f00f_bug        : no
> coma_bug        : no
> fpu             : no
> fpu_exception   : no
> cpuid level     : -1
> wp              : yes
> flags           :
> bogomips        : 96.51
> clflush size    : 32
> cache_alignment : 32
> address sizes   : 32 bits physical, 32 bits virtual
> power management:

You would have "tsc" in the flags if that cpu had a tsc. So, I guess you
are right, this cpu does not have a tsc.

-- 
                                                                Gilles.

Re: [Xenomai] "illegal instruction", then "rt_task_start()" error -38 (on a 486/no fpu)

[Marc Le Douarain]

Le 17/06/2012 21:19, Gilles Chanteperdrix a écrit :
> On 06/17/2012 09:05 PM, Marc Le Douarain wrote:
>> Le 11/06/2012 19:09, Gilles Chanteperdrix a écrit :
>>> I think vortex86sx has a tsc, so, you should try and modify the linux
>>> kernel configuration to select  CONFIG_X86_TSC, or simply select a
>>> processor which has a tsc. You will get better latencies.
>>>
>> I've made two more tests:
>> - compiling for Pentium-Classic (M586-TSC)
>> =>  Kernel doesn't boot at all
>> (I've seen invalid opcode, and after I-pipe stack call-trace
>> ftrace_make_nop)
>>
>> - modifying arch/x86/Kconfig.cpu (there isn't any M486-TSC ! and X86-TSC
>> can't be acceded directly!?)
>>     in config X86_TSC, adding for depends on M486
>> =>  But also kernel not working.
>>
>> I'm finally not sure if there is a TSC available in the Vortex86sx,
>> perhaps only on the Vortex86dx (fpu difference only normally),
>> or none !?
> Someone on this list claimed that vortex86sx may have a tsc:
> http://www.xenomai.org/pipermail/xenomai-help/2010-01/msg00153.html
>
> I do not know for sure however.
>
>> Here with my previous 486 kernel, what gives /proc/cpuinfo:
>> processor       : 0
>> vendor_id       : CyrixInstead
>> cpu family      : 4
>> model           : 1
>> model name      : Cx486SLC
>> stepping        : unknown
>> fdiv_bug        : yes
>> hlt_bug         : no
>> f00f_bug        : no
>> coma_bug        : no
>> fpu             : no
>> fpu_exception   : no
>> cpuid level     : -1
>> wp              : yes
>> flags           :
>> bogomips        : 96.51
>> clflush size    : 32
>> cache_alignment : 32
>> address sizes   : 32 bits physical, 32 bits virtual
>> power management:
> You would have "tsc" in the flags if that cpu had a tsc. So, I guess you
> are right, this cpu does not have a tsc.
>
I've tested again with another card having this time a Vortex86DX on it.
Reused the same kernel sources, choosing "Pentium-classic" M586TSC and 
no more activated "math emulation".
And surprise it works perfectly !
So for me, it's seems not to be really the same processor, and not only 
a FPU add-on difference...
Even if when I asked ICOP, they tell me only performance & FPU 
difference, strange.

Interesting, this time here what cat /proc/cpuinfo gives me :
processor       : 0
vendor_id       : Vortex86 SoC
cpu family      : 5
model           : 2
model name      : 05/02
stepping        : 2
cpu MHz         : 799.974
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
flags           : fpu tsc cx8
bogomips        : 1599.94
clflush size    : 32
cache_alignment : 32
address sizes   : 32 bits physical, 32 bits virtual
power management:


For information, Xenomai has been configured like that :
./configure --disable-x86-sep CFLAGS="-march=i586 
-fno-omit-frame-pointer" LDFLAGS="-march=i586"
(I was surprised that the -fno-omit-frame-pointer were again necessary!!!)

With latency -p 10000 with load, best = 19 micro-secs & worst = 63 
micro-secs.
The price is quite less for the vsx version, and even if also less 
efficient for real-time, for my application it should be yet enough (2-3 
tasks at 5-10 milli-secs) !?
(With VSX version, worst latency gives 200 micro-secs... finally not so 
much ?)


And lastly, dmesg for people that could be interested with:
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpu
[    0.000000] Linux version 2.6.38.8-xeno_mld (marc@marc-laptop-airis) 
(gcc ver
sion 4.6.1 (Ubuntu/Linaro 4.6.1-9ubuntu3) ) #10 Mon Jul 9 14:29:52 CEST 
2012
[    0.000000] CPU: vendor_id 'Vortex86 SoC' unknown, using generic init.
[    0.000000] CPU: Your system may be unstable.
[    0.000000] BIOS-provided physical RAM map:
[    0.000000]  BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
[    0.000000]  BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
[    0.000000]  BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved)
[    0.000000]  BIOS-e820: 0000000000100000 - 0000000010000000 (usable)
[    0.000000]  BIOS-e820: 00000000ff000000 - 0000000100000000 (reserved)
[    0.000000] Notice: NX (Execute Disable) protection missing in CPU!
[    0.000000] DMI not present or invalid.
[    0.000000] e820 update range: 0000000000000000 - 0000000000010000 
(usable) =
=> (reserved)
[    0.000000] e820 remove range: 00000000000a0000 - 0000000000100000 
(usable)
[    0.000000] last_pfn = 0x10000 max_arch_pfn = 0x100000
[    0.000000] initial memory mapped : 0 - 01c00000
[    0.000000] init_memory_mapping: 0000000000000000-0000000010000000
[    0.000000]  0000000000 - 0010000000 page 4k
[    0.000000] kernel direct mapping tables up to 10000000 @ 
1bbd000-1c00000
[    0.000000] 0MB HIGHMEM available.
[    0.000000] 256MB LOWMEM available.
[    0.000000]   mapped low ram: 0 - 10000000
[    0.000000]   low ram: 0 - 10000000
[    0.000000] Zone PFN ranges:
[    0.000000]   DMA      0x00000010 -> 0x00001000
[    0.000000]   Normal   0x00001000 -> 0x00010000
[    0.000000]   HighMem  empty
[    0.000000] Movable zone start PFN for each node
[    0.000000] early_node_map[2] active PFN ranges
[    0.000000]     0: 0x00000010 -> 0x0000009f
[    0.000000]     0: 0x00000100 -> 0x00010000
[    0.000000] On node 0 totalpages: 65423
[    0.000000] free_area_init_node: node 0, pgdat c1649ba0, node_mem_map 
cfdff20
0
[    0.000000]   DMA zone: 32 pages used for memmap
[    0.000000]   DMA zone: 0 pages reserved
[    0.000000]   DMA zone: 3951 pages, LIFO batch:0
[    0.000000]   Normal zone: 480 pages used for memmap
[    0.000000]   Normal zone: 60960 pages, LIFO batch:15
[    0.000000] Allocating PCI resources starting at 10000000 (gap: 
10000000:ef00
0000)
[    0.000000] pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768
[    0.000000] pcpu-alloc: [0] 0
[    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  
Total pag
es: 64911
[    0.000000] Kernel command line: root=/dev/sda2 BOOT_IMAGE=kernxeno
[    0.000000] PID hash table entries: 1024 (order: 0, 4096 bytes)
[    0.000000] Dentry cache hash table entries: 32768 (order: 5, 131072 
bytes)
[    0.000000] Inode-cache hash table entries: 16384 (order: 4, 65536 
bytes)
[    0.000000] Initializing CPU#0
[    0.000000] allocated 1310400 bytes of page_cgroup
[    0.000000] please try 'cgroup_disable=memory' option if you don't 
want memor
y cgroups
[    0.000000] Initializing HighMem for node 0 (00000000:00000000)
[    0.000000] Memory: 249920k/262144k available (4022k kernel code, 
11772k rese
rved, 2439k data, 488k init, 0k highmem)
[    0.000000] virtual kernel memory layout:
[    0.000000]     fixmap  : 0xfffe4000 - 0xfffff000   ( 108 kB)
[    0.000000]     pkmap   : 0xff800000 - 0xffc00000   (4096 kB)
[    0.000000]     vmalloc : 0xd0800000 - 0xff7fe000   ( 751 MB)
[    0.000000]     lowmem  : 0xc0000000 - 0xd0000000   ( 256 MB)
[    0.000000]       .init : 0xc1650000 - 0xc16ca000   ( 488 kB)
[    0.000000]       .data : 0xc13edb02 - 0xc164fa80   (2439 kB)
[    0.000000]       .text : 0xc1000000 - 0xc13edb02   (4022 kB)
[    0.000000] Checking if this processor honours the WP bit even in 
supervisor
mode...Ok.
[    0.000000] SLUB: Genslabs=15, HWalign=32, Order=0-3, MinObjects=0, 
CPUs=1, N
odes=1
[    0.000000] NR_IRQS:16 nr_irqs:16 16
[    0.000000] CPU 0 irqstacks, hard=cf808000 soft=cf80a000
[    0.000000] I-pipe 2.11-02: pipeline enabled.
[    0.000000] Console: colour dummy device 80x25
[    0.000000] console [tty0] enabled
[    0.000000] Fast TSC calibration using PIT
[    0.000000] Detected 799.974 MHz processor.
[    0.004014] Calibrating delay loop (skipped), value calculated using 
timer fr
equency.. 1599.94 BogoMIPS (lpj=3199896)
[    0.008083] pid_max: default: 32768 minimum: 301
[    0.008400] Security Framework initialized
[    0.008649] AppArmor: AppArmor initialized
[    0.009134] Mount-cache hash table entries: 512
[    0.010210] Initializing cgroup subsys cpuacct
[    0.010325] Initializing cgroup subsys memory
[    0.010488] Initializing cgroup subsys devices
[    0.010559] Initializing cgroup subsys freezer
[    0.010625] Initializing cgroup subsys net_cls
[    0.010690] Initializing cgroup subsys blkio
[    0.011090] CPU: Vortex86 SoC 05/02 stepping 02
[    0.011487] ftrace: allocating 17134 entries in 34 pages
[    0.016427] Performance Events:
[    0.038785] NET: Registered protocol family 16
[    0.040152] EISA bus registered
[    0.049416] PCI: PCI BIOS revision 3.00 entry at 0xf0031, last bus=0
[    0.049509] PCI: Using configuration type 1 for base access
[    0.068221] bio: create slab <bio-0> at 0
[    0.069499] vgaarb: loaded
[    0.070813] SCSI subsystem initialized
[    0.071654] libata version 3.00 loaded.
[    0.072629] usbcore: registered new interface driver usbfs
[    0.072927] usbcore: registered new interface driver hub
[    0.073448] usbcore: registered new device driver usb
[    0.074005] PCI: Probing PCI hardware
[    0.074080] PCI: Probing PCI hardware (bus 00)
[    0.074422] pci 0000:00:00.0: [17f3:6021] type 0 class 0x000600
[    0.074607] pci 0000:00:07.0: [17f3:6031] type 0 class 0x000601
[    0.074781] pci 0000:00:08.0: [17f3:6040] type 0 class 0x000200
[    0.074832] pci 0000:00:08.0: reg 10: [io  0xdf00-0xdfff]
[    0.074872] pci 0000:00:08.0: reg 14: [mem 0xfefff800-0xfefff8ff]
[    0.074947] pci 0000:00:08.0: reg 30: [mem 0xfefe0000-0xfefeffff pref]
[    0.075056] pci 0000:00:0b.0: [17f3:6060] type 0 class 0x000c03
[    0.075103] pci 0000:00:0b.0: reg 10: [mem 0x000e0000-0x000e0fff]
[    0.075258] pci 0000:00:0b.1: [17f3:6061] type 0 class 0x000c03
[    0.075303] pci 0000:00:0b.1: reg 10: [mem 0x000e1000-0x000e10ff]
[    0.075475] pci 0000:00:0c.0: [17f3:1010] type 0 class 0x000180
[    0.075525] pci 0000:00:0c.0: reg 10: [io  0x01f0-0x01f7]
[    0.075562] pci 0000:00:0c.0: reg 14: [io  0x03f4-0x03f7]
[    0.075600] pci 0000:00:0c.0: reg 18: [io  0x0170-0x0177]
[    0.075637] pci 0000:00:0c.0: reg 1c: [io  0x0374-0x0377]
[    0.075674] pci 0000:00:0c.0: reg 20: [io  0xfff0-0xffff]
[    0.075722] pci 0000:00:0c.0: reg 30: [mem 0x00000000-0x0001ffff pref]
[    0.077844] pci 0000:00:07.0: default IRQ router [17f3:6031]
[    0.078034] PCI: pci_cache_line_size set to 32 bytes
[    0.078114] pci 0000:00:0b.0: address space collision: [mem 
0x000e0000-0x000e
0fff] conflicts with reserved [mem 0x000e0000-0x000fffff]
[    0.078278] pci 0000:00:0b.1: address space collision: [mem 
0x000e1000-0x000e
10ff] conflicts with reserved [mem 0x000e0000-0x000fffff]
[    0.078484] reserve RAM buffer: 000000000009fc00 - 000000000009ffff
[    0.079509] NetLabel: Initializing
[    0.079605] NetLabel:  domain hash size = 128
[    0.079665] NetLabel:  protocols = UNLABELED CIPSOv4
[    0.079870] NetLabel:  unlabeled traffic allowed by default
[    0.080128] Switching to clocksource pit
[    0.157707] AppArmor: AppArmor Filesystem Enabled
[    0.158033] PnPBIOS: Scanning system for PnP BIOS support...
[    0.158201] PnPBIOS: Found PnP BIOS installation structure at 0xc00f3be0
[    0.158288] PnPBIOS: PnP BIOS version 1.0, entry 0xf0000:0x45aa, dseg 
0xf0000
[    0.158750] pnp 00:00: [mem 0x00000000-0x0009fbff]
[    0.158786] pnp 00:00: [mem 0x0009fc00-0x0009ffff]
[    0.158813] pnp 00:00: [mem 0x000e0000-0x000fffff]
[    0.158841] pnp 00:00: [mem 0x00100000-0x0fffffff]
[    0.158869] pnp 00:00: [mem 0xff000000-0xffffffff]
[    0.159199] system 00:00: [mem 0x00000000-0x0009fbff] could not be 
reserved
[    0.159319] system 00:00: [mem 0x0009fc00-0x0009ffff] could not be 
reserved
[    0.159414] system 00:00: [mem 0x000e0000-0x000fffff] could not be 
reserved
[    0.159509] system 00:00: [mem 0x00100000-0x0fffffff] could not be 
reserved
[    0.159603] system 00:00: [mem 0xff000000-0xffffffff] has been reserved
[    0.159699] system 00:00: Plug and Play BIOS device, IDs PNP0c01 
(active)
[    0.159899] pnp 00:01: [io  0x0020-0x0021]
[    0.159933] pnp 00:01: [io  0x00a0-0x00a1]
[    0.159961] pnp 00:01: [irq 2]
[    0.160184] pnp 00:01: Plug and Play BIOS device, IDs PNP0000 (active)
[    0.160290] pnp 00:02: [dma 4]
[    0.160317] pnp 00:02: [io  0x0000-0x000f]
[    0.160343] pnp 00:02: [io  0x0080-0x0090]
[    0.160369] pnp 00:02: [io  0x0094-0x009f]
[    0.160395] pnp 00:02: [io  0x00c0-0x00de]
[    0.160602] pnp 00:02: Plug and Play BIOS device, IDs PNP0200 (active)
[    0.160704] pnp 00:03: [irq 0]
[    0.160731] pnp 00:03: [io  0x0040-0x0043]
[    0.160938] pnp 00:03: Plug and Play BIOS device, IDs PNP0100 (active)
[    0.161043] pnp 00:04: [irq 8]
[    0.161070] pnp 00:04: [io  0x0070-0x0071]
[    0.161308] pnp 00:04: Plug and Play BIOS device, IDs PNP0b00 (active)
[    0.161595] pnp 00:05: Plug and Play BIOS device, IDs PNP0a03 (disabled)
[    0.161707] pnp 00:06: [io  0x0061]
[    0.161927] pnp 00:06: Plug and Play BIOS device, IDs PNP0800 (active)
[    0.162048] pnp 00:07: [irq 13]
[    0.162075] pnp 00:07: [io  0x00f0-0x00ff]
[    0.162286] pnp 00:07: Plug and Play BIOS device, IDs PNP0c04 (active)
[    0.162416] pnp 00:08: [io  0x04d0-0x04d1]
[    0.162444] pnp 00:08: [io  0x0cf8-0x0cff]
[    0.162470] pnp 00:08: [io  0xfc00-0xfc0f]
[    0.162496] pnp 00:08: [io  0x002e-0x002f]
[    0.162522] pnp 00:08: [io  0x0a00-0x0a0f]
[    0.162548] pnp 00:08: [io  0x0a20-0x0a2f]
[    0.162574] pnp 00:08: [io  0x0a10-0x0a1f]
[    0.162600] pnp 00:08: [io  0x0a30-0x0a3f]
[    0.162627] pnp 00:08: [io  0x0a40-0x0a4f]
[    0.162653] pnp 00:08: [io  0x0a50-0x0a5f]
[    0.162681] pnp 00:08: [io  0x0000-0xffffffff disabled]
[    0.162712] pnp 00:08: [mem 0x00000000-0xffffffff disabled]
[    0.162743] pnp 00:08: [mem 0x00000000-0xffffffff disabled]
[    0.162773] pnp 00:08: [mem 0x00000000-0xffffffff disabled]
[    0.162803] pnp 00:08: [mem 0x00000000-0xffffffff disabled]
[    0.162833] pnp 00:08: [mem 0x00000000-0xffffffff disabled]
[    0.162863] pnp 00:08: [mem 0x00000000-0xffffffff disabled]
[    0.162892] pnp 00:08: [mem 0x00000000-0xffffffff disabled]
[    0.162922] pnp 00:08: [mem 0x00000000-0xffffffff disabled]
[    0.163265] system 00:08: [io  0x04d0-0x04d1] has been reserved
[    0.163386] system 00:08: [io  0x0cf8-0x0cff] could not be reserved
[    0.163475] system 00:08: [io  0xfc00-0xfc0f] has been reserved
[    0.163562] system 00:08: [io  0x0a00-0x0a0f] has been reserved
[    0.163648] system 00:08: [io  0x0a20-0x0a2f] has been reserved
[    0.163734] system 00:08: [io  0x0a10-0x0a1f] has been reserved
[    0.163905] system 00:08: [io  0x0a30-0x0a3f] has been reserved
[    0.163999] system 00:08: [io  0x0a40-0x0a4f] has been reserved
[    0.164086] system 00:08: [io  0x0a50-0x0a5f] has been reserved
[    0.164186] system 00:08: Plug and Play BIOS device, IDs PNP0c02 
(active)
[    0.164335] pnp 00:09: [io  0x03f8-0x03ff]
[    0.164364] pnp 00:09: [irq 4]
[    0.164882] pnp 00:09: Plug and Play BIOS device, IDs PNP0501 (active)
[    0.165048] pnp 00:0a: [io  0x02f8-0x02ff]
[    0.165077] pnp 00:0a: [irq 3]
[    0.165594] pnp 00:0a: Plug and Play BIOS device, IDs PNP0501 (active)
[    0.165743] pnp 00:0b: [io  0x03e8-0x03ef]
[    0.165771] pnp 00:0b: [irq 10]
[    0.166269] pnp 00:0b: Plug and Play BIOS device, IDs PNP0501 (active)
[    0.166418] pnp 00:0c: [io  0x02e8-0x02ef]
[    0.166446] pnp 00:0c: [irq 11]
[    0.166944] pnp 00:0c: Plug and Play BIOS device, IDs PNP0501 (active)
[    0.167178] pnp 00:0d: [io  0x0278-0x027f]
[    0.167206] pnp 00:0d: [io  0x0678-0x067a]
[    0.167232] pnp 00:0d: [irq 7]
[    0.167258] pnp 00:0d: [dma 4294967295 disabled]
[    0.167677] pnp 00:0d: Plug and Play BIOS device, IDs PNP0400 (active)
[    0.167913] pnp 00:0e: [io  0x0a60-0x0a6f]
[    0.168245] system 00:0e: [io  0x0a60-0x0a6f] has been reserved
[    0.168375] system 00:0e: Plug and Play BIOS device, IDs PNP0c02 
(active)
[    0.168541] pnp 00:0f: [io  0x03f0-0x03f5]
[    0.168635] pnp 00:0f: disabling [io  0x03f0-0x03f5] because it 
overlaps 0000
:00:0c.0 BAR 1 [io  0x03f4-0x03f7]
[    0.168994] system 00:0f: Plug and Play BIOS device, IDs PNP0c02 
(active)
[    0.169165] pnp 00:10: [irq 1]
[    0.169190] pnp 00:10: [io  0x0060]
[    0.169214] pnp 00:10: [io  0x0064]
[    0.169459] pnp 00:10: Plug and Play BIOS device, IDs PNP0303 (active)
[    0.169524] PnPBIOS: 17 nodes reported by PnP BIOS; 17 recorded by 
driver
[    0.186137] pci 0000:00:0c.0: BAR 6: assigned [mem 
0x10000000-0x1001ffff pref
]
[    0.186309] pci 0000:00:0b.0: BAR 0: assigned [mem 
0x10020000-0x10020fff]
[    0.186415] pci 0000:00:0b.0: BAR 0: set to [mem 
0x10020000-0x10020fff] (PCI
address [0x10020000-0x10020fff])
[    0.186552] pci 0000:00:0b.1: BAR 0: assigned [mem 
0x10021000-0x100210ff]
[    0.186648] pci 0000:00:0b.1: BAR 0: set to [mem 
0x10021000-0x100210ff] (PCI
address [0x10021000-0x100210ff])
[    0.186781] pci_bus 0000:00: resource 0 [io  0x0000-0xffff]
[    0.186810] pci_bus 0000:00: resource 1 [mem 0x00000000-0xffffffff]
[    0.187203] NET: Registered protocol family 2
[    0.187733] IP route cache hash table entries: 2048 (order: 1, 8192 
bytes)
[    0.189452] TCP established hash table entries: 8192 (order: 4, 65536 
bytes)
[    0.189872] TCP bind hash table entries: 8192 (order: 3, 32768 bytes)
[    0.190091] TCP: Hash tables configured (established 8192 bind 8192)
[    0.190167] TCP reno registered
[    0.190231] UDP hash table entries: 256 (order: 0, 4096 bytes)
[    0.190331] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
[    0.191063] NET: Registered protocol family 1
[    1.787950] pci 0000:00:0b.1: EHCI: BIOS handoff failed (BIOS bug?) 
01010001
[    1.788208] PCI: CLS 16 bytes, default 32
[    1.790726] audit: initializing netlink socket (disabled)
[    1.790915] type=2000 audit(1341918028.784:1): initialized
[    1.869449] I-pipe: Domain Xenomai registered.
[    1.869596] Xenomai: hal/i386 started.
[    1.869800] Xenomai: scheduling class idle registered.
[    1.869874] Xenomai: scheduling class rt registered.
[    1.881426] Xenomai: real-time nucleus v2.5.6 (Wormhole Wizards) loaded.
[    1.882357] Xenomai: starting native API services.
[    1.882463] Xenomai: starting POSIX services.
[    1.882725] Xenomai: starting RTDM services.
[    1.909753] VFS: Disk quotas dquot_6.5.2
[    1.910547] Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
[    1.915003] NTFS driver 2.1.30 [Flags: R/O].
[    1.916533] fuse init (API version 7.16)
[    1.917999] msgmni has been set to 488
[    1.922326] Block layer SCSI generic (bsg) driver version 0.4 loaded 
(major 2
53)
[    1.922864] io scheduler noop registered
[    1.922957] io scheduler deadline registered
[    1.923276] io scheduler cfq registered (default)
[    1.924641] isapnp: Scanning for PnP cards...
[    2.278726] isapnp: No Plug & Play device found
[    2.605483] Serial: 8250/16550 driver, 12 ports, IRQ sharing enabled
[    2.608258] serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
[    2.612262] serial8250: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A
[    2.620253] serial8250: ttyS2 at I/O 0x3e8 (irq = 4) is a 16550A
[    2.624261] serial8250: ttyS3 at I/O 0x2e8 (irq = 3) is a 16550A
[    2.636263] 00:09: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
[    2.644265] 00:0a: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A
[    2.652262] 00:0b: ttyS2 at I/O 0x3e8 (irq = 10) is a 16550A
[    2.656266] 00:0c: ttyS3 at I/O 0x2e8 (irq = 11) is a 16550A
[    2.676340] brd: module loaded
[    2.683087] loop: module loaded
[    2.687986] scsi0 : pata_it821x
[    2.689291] scsi1 : pata_it821x
[    2.689898] ata1: PATA max UDMA/133 cmd 0x1f0 ctl 0x3f4 bmdma 0xfff0 
irq 14
[    2.690006] ata2: PATA max UDMA/133 cmd 0x170 ctl 0x374 bmdma 0xfff8 
irq 14
[    2.698384] Fixed MDIO Bus: probed
[    2.699124] r6040: RDC R6040 NAPI net driver,version 0.28 (07Oct2011)
[    2.706690] r6040_eth_mii: probed
[    2.707041] r6040 0000:00:08.0: attached PHY driver [Generic PHY] 
(mii_bus:ph
y_addr=0000:00:08.0-0:01)
[    2.709121] PPP generic driver version 2.4.2
[    2.710022] tun: Universal TUN/TAP device driver, 1.6
[    2.710130] tun: (C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>
[    2.711531] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    2.711858] ehci_hcd 0000:00:0b.1: EHCI Host Controller
[    2.712807] ehci_hcd 0000:00:0b.1: new USB bus registered, assigned 
bus numbe
r 1
[    2.736324] ehci_hcd 0000:00:0b.1: irq 9, io mem 0x10021000
[    2.748261] ehci_hcd 0000:00:0b.1: USB 2.0 started, EHCI 1.00
[    2.749640] hub 1-0:1.0: USB hub found
[    2.749790] hub 1-0:1.0: 2 ports detected
[    2.750377] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[    2.750652] ohci_hcd 0000:00:0b.0: OHCI Host Controller
[    2.751395] ohci_hcd 0000:00:0b.0: new USB bus registered, assigned 
bus numbe
r 2
[    2.751679] ohci_hcd 0000:00:0b.0: irq 15, io mem 0x10020000
[    2.835327] hub 2-0:1.0: USB hub found
[    2.835479] hub 2-0:1.0: 2 ports detected
[    2.836037] uhci_hcd: USB Universal Host Controller Interface driver
[    2.836882] usbcore: registered new interface driver cdc_acm
[    2.836994] cdc_acm: v0.26:USB Abstract Control Model driver for USB 
modems a
nd ISDN adapters
[    2.837310] usbcore: registered new interface driver uas
[    2.837393] Initializing USB Mass Storage driver...
[    2.837854] usbcore: registered new interface driver usb-storage
[    2.837940] USB Mass Storage support registered.
[    2.838460] usbcore: registered new interface driver usbserial
[    2.838706] USB Serial support registered for generic
[    2.838976] usbcore: registered new interface driver usbserial_generic
[    2.839061] usbserial: USB Serial Driver core
[    2.839282] USB Serial support registered for FTDI USB Serial Device
[    2.839993] usbcore: registered new interface driver ftdi_sio
[    2.840091] ftdi_sio: v1.6.0:USB FTDI Serial Converters Driver
[    2.840426] USB Serial support registered for pl2303
[    2.840754] usbcore: registered new interface driver pl2303
[    2.840836] pl2303: Prolific PL2303 USB to serial adaptor driver
[    2.841579] i8042: PNP: PS/2 Controller [PNP0303] at 0x60,0x64 irq 1
[    2.841669] i8042: PNP: PS/2 appears to have AUX port disabled, if 
this is in
correct please boot with i8042.nopnp
[    2.842598] serio: i8042 KBD port at 0x60,0x64 irq 1
[    2.844440] rtc_cmos 00:04: rtc core: registered rtc_cmos as rtc0
[    2.844637] rtc0: alarms up to one day, 114 bytes nvram
[    2.845303] EISA: Probing bus 0 at eisa.0
[    2.845555] EISA: Detected 0 cards.
[    2.848593] TCP cubic registered
[    2.851196] NET: Registered protocol family 10
[    2.858157] NET: Registered protocol family 17
[    2.858540] Registering the dns_resolver key type
[    2.860882] ata1.00: CFA: EmbedDisk 128MB, 081107, max UDMA/66
[    2.861008] ata1.00: 256000 sectors, multi 0: LBA
[    2.861748] registered taskstats version 1
[    2.868751] Switching to clocksource tsc
[    2.868994] ata1.00: configured for UDMA/66
[    2.870321] scsi 0:0:0:0: Direct-Access     ATA      EmbedDisk 128MB  
0811 PQ
: 0 ANSI: 5
[    2.871847] sd 0:0:0:0: [sda] 256000 512-byte logical blocks: (131 
MB/125 MiB
)
[    2.872607] sd 0:0:0:0: [sda] Write Protect is off
[    2.872714] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
[    2.873189] sd 0:0:0:0: [sda] Write cache: disabled, read cache: 
enabled, doe
sn't support DPO or FUA
[    2.875067] sd 0:0:0:0: Attached scsi generic sg0 type 0
[    2.881479]  sda: sda1 sda2
[    2.884271] rtc_cmos 00:04: setting system clock to 2012-07-10 
18:00:30 UTC (
1341918030)
[    2.884433] BIOS EDD facility v0.16 2004-Jun-25, 0 devices found
[    2.884506] EDD information not available.
[    2.887218] sd 0:0:0:0: [sda] Attached SCSI disk
[    3.037432] VFS: Mounted root (ext2 filesystem) readonly on device 8:2.
[    3.037772] Freeing unused kernel memory: 488k freed
[    3.040953] Write protecting the kernel text: 4024k
[    3.041354] Write protecting the kernel read-only data: 2088k
[    5.703955] eth0: link UP - 100/full
[   13.423554] eth0: no IPv6 routers present
[ 4233.710868] EXT2-fs (sda2): warning: mounting unchecked fs, running 
e2fsck is
  recommended

Bye, bye.