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The reset for ETM trace unit is the same as a cold reset for the processor. The ETM trace unit is not reset when warm reset is applied to the processor so that tracing through warm processor reset is possible.

If the ETM trace unit is reset, tracing stops until the ETM trace unit is reprogrammed and re-enabled. However, if the processor is reset using warm reset, the last few instructions provided by the processor before the reset might not be traced.