You have 2 separate problems:
1/ RTL: the later versions of RTL use channel 2 of the 8254 internally,
so it can't be used for the sound example on a 486.
2/ RTAI: Depending on what PC you have, the TICK_PERIOD may be too fast
and cause the machine to hang, to solve this I set the DIVISOR to 1. I
can get this to work on a 486DX-33 if I set the following in
sound/rt_process.c (this should solve your RTAI problem).
//#define ONESHOT
#define TIMER_TO_CPU 3 // < 0 || > 1 to maintain a symmetric processed
timer.
//#define DIVISOR 10
#define DIVISOR 1
#define TICK_PERIOD ((125000 + DIVISOR/2)/DIVISOR)
NOTE: I always use periodic mode on 486's as otherwise anything that you
do on the machine that could cause a 'beep' on the speaker (e.g
backspace at the command prompt) will cause the machine to hang, this is
a known and documented limitation.
Regards, Stuart.
Der Herr Hofr.at wrote:
>
> Hi !
>
> I guess I have a problem understanding the 8254 timer chip , maby sombody
> could explain this ....
> The old sound examples from 9H worked on my 486 the new ones did not , the
> difference is that the new sound.o uses the second counter on the 8254 .
>
> I have problems getting RTAI 0.8 (infact also 0.6 and 0.5 ) running on a
> 486 . is it posible that the 8254 on this old box simply only has ONE
> counter on that chip , and that the problem is due to RTAI using the second
> counter in rtai.c and in many other places.
> how can I find out what exactly I have in this box ( I can probably open it
> up , but then again I would like to find out what the linux kernel will see
> not what I can find on the motherboard...)
>
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