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* bsps/aarch64/raspberrypi: Add system timer supportHEADmasterNing Yang13 days1-0/+25
The clock from the ARM timer is derived from the system clock. This clock can change dynamically e.g. if the system goes into reduced power or in low power mode. Thus the clock speed adapts to the overall system performance capabilities. For accurate timing it is recommended to use the system timers. if BSP_CLOCK_USE_SYSTEMTIMER = 1, use the System Timer, otherwise use the ARM Timer.