Hi haitao
you are right performance may be bad with lowered frequencies, unfortunately
this is unavoidable. In general processor current may be quite big, please look
at sect.4.1.5 Maximum Supply Currents i.MX6DQ Datasheet
http://www.nxp.com/docs/en/data-sheet/IMX6DQCEC.pdf
For decreasing power consumption and current linux uses cpufreq driver described
in Chapter 23 CPU Frequency Scaling (CPUFREQ) Driver attached Linux Manual.
Best regards
igor
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