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The reset for the ETM trace unit is the same as a cold reset for the processor. If the ETM trace unit is reset, tracing stops until the ETM trace unit is reprogrammed and re-enabled.
A warm reset of the processor does not reset the ETM trace unit. Therefore it is possible to trace through warm processor reset. However, if the processor is reset using warm reset, the trace unit might not be able to trace the last few instructions before the reset.