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Performance Monitoring features for Cortex A8

Note: This was originally posted on 22nd January 2010 at http://forums.arm.com

Hi,

I am trying to use the performance counter feature in Cortex A8. I have downloaded the sample code given here : [url="http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.faqs/ka4237.html"]http://infocenter.arm.com/help/index.jsp?t...aqs/ka4237.html[/url]

I am able to find the cycles taken via the cycle counter. But when I set an event to count, the counter always printing zero. The register contents when viewed in RV Debugger shows the contents to be untouched(all excalamation marks!!)..even the cycle counter is not showing its contents.

It would be of great help if you could give some pointers regarding what to check for/what I might be missing out?

Thanks,
Smitha Joseph