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List:       qemu-devel
Subject:    [Qemu-devel] changing simulated CPU frequency
From:       Jonathan ILIAS <jonathan.ilias () eseo ! fr>
Date:       2006-01-31 9:39:05
Message-ID: 43DF3039.6090604 () eseo ! fr
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Hi,

I'm trying to bypass a bug in an old version of RTAI, which does not 
work correctly with processors that have a clock greater than 2^31 Hz 
(frequency stored in a signed 32 bits integer).

As I cannot use a earlier version and fixing this bug may not be 
trivial, I'm looking for a way to reduce the simulated Qemu CPU clock.

I tried to change linux-user/main.c to force the use of the following 
version of cpu_get_real_ticks function :
static uint64_t emu_time;

int64_t cpu_get_real_ticks(void)
{
     return emu_time++;
}

But Linux in Qemu continues to detect a CPU at 3,4 GHz.

Do you know if there is a way to modify Qemu source to have a lower CPU 
clock ?

I hope I've described my problem clearly...
-- 
Jonathan ILIAS, assistant pédagogique
http://www.eseo.fr/~jilias/
ESEO
4, rue Merlet de la Boulaye
BP 30926 - 49009 ANGERS cedex 01 - FRANCE
tél : 02 41 86 67 57


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