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Timing accuracy of ARM Fast Models Cortex-M55 SysTick timer

Mughees Chohan

Hi,

I have built a custom platform based on Cortex-M55 using ARM Fast Model Tools. Everything runs fine except accuracy of systick timer. I have ported zephyr to this platform. The timer seems to be just ticking as fast as it can and I am unable to establish accurate time base for it. In another platform, that I made I used the R82 core with a Memory Mapped Counter Module, I was able to set a property 'use_real_time' after which timer generated accurate time base. However, for M-55 and systick, I am unable to find any such option. 

Any help would be greatly appreciated. Thanks.

Best Regards,

Mughees