Fabio Degiovanni - Eicas degiovanni at eicas.it
Fri Jun 20 15:32:16 UTC 2003

Dear Jerry Needell,
                                thank you for your help. Some other 
questions: I have sis intalled, where can I find documentation about 
sis? When I use the target sim option in sparc-rtems-gdb do I use sis or 
another simulator?
Where can I find the limitation of sparc-rtems-gdb simulator? In the 
tsim site it is clearly stated the limit of 232 instruction, but I 
didn't find anything for my simulator. I think that you correctly deduce 
that the same limit exists, but is there a document stating clearly this 
Thank you very much again for you help

Fabio Degiovanni

Jerry Needell wrote:

> On Friday, Jun 20, 2003, at 10:34 US/Eastern, Fabio Degiovanni - Eicas 
> wrote:
>> Dear Jarry Needell,
>>                                I think you were right: it is a 
>> problem of overflow. I tried with CONFIGURE_MICROSECONDS_PER_TICK 
>> 1000 and rtems_task_wake_after(1000). The problems is at the 305th 
>> iteration. I tried to put the directive rtems_clock_get( 
>> RTEMS_CLOCK_GET_TICKS_SINCE_BOOT, &inter ); to see at what time (in 
>> ticks this happens) and I found out at 305266 ticks.
> I was just about to try that myself :-)
>> I don't understand what variables is subjected to overflow. I'm used 
>> to Linux real-time: in that case there is a periodic interrupt timer 
>> that is loaded to the value of MICROSECONDS_PER_TICK 1000, it counts 
>> down till 0 then it gives an interrupt, the interrupt service routine 
>> increment the value of ticks an reset the PIT to the 
>> MICROSECONDS_PER_TICK value. If RTEMS follows nearly the same 
>> procedure I don't see any point in which an overflow can occur. How 
>> does RTEMS work? What the variable that is subject to overflow? Why?
>> Thank you very much for your help
> The problem is not in RTEMS, but in the simulator. On real hardware, 
> it does not crash and it runs in "real time" :-) .
> - Jerry
>> Fabio Degiovanni
>> -- 
>> Dott. Ing. Degiovanni Fabio
>> Eicas Automazione
>> Via Vincenzo Vela, 27 10128 Torino (ITALIA)
>> Telefoni +39-11-562.37.98/562.3088 Fax +39-11-436.06.79

Dott. Ing. Degiovanni Fabio
Eicas Automazione
Via Vincenzo Vela, 27 10128 Torino (ITALIA)
Telefoni +39-11-562.37.98/562.3088 Fax +39-11-436.06.79

More information about the users mailing list