loading the CPU and exercising the SDRAM

[Aras Vaichas <arasv@xxxxxxxxxxxxxxxxxxxxxxx>]

I am writing a test suite that runs all the peripherals on our custom
AT91RM9200 board for EMC testing, burn-in tests and thermal testing. I want a
small programme that will run the CPU at full load and will access the SDRAM
intensively.

How do I know if my code is using the SDRAM and not just using the cache? How
can I make it so that my programme doesn't use the CPU cache?

For example, this simple piece of code runs the CPU at around 98% which is
good, but I don't know if it's using the SDRAM or the internal cache.

int main(int argc, char **argv)
{
        volatile long a;

        while(1)
                a = a * a;
}


Suggestions?

regards,

Aras Vaichas

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