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That's one bootloader behavior. If there is another bootloader that clocks can be simply disabled. I don't think there is any reason to depends on bootloader behavior. If there are clocks which has to be ON I can't see any reason not to drive them. TRM page 741 Trace Port Clock The trace port clock is used to clock the TPIU and trace buffer when the MIO interface is chosen and must be twice the frequency of the desired TPIU clock. The TPIU clock frequency must be chosen to be fast enough to allow the trace port to keep up with the amount of data being traced, but slow enough to meet the dynamic characteristics of the data output buffers of the TPIU. It means even Linux drivers are not handling that clocks that clocks should be handled hence described. That's why I don't think the patch is correct. Thanks, Michal