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→OPP configuration
The situation is even harder to manage because of internal system constraint: changing the frequency for a subsystem requires changing its power supply (as a rule of thumb, higher power supply is required to have a stable higher frequency). There are some other restrictions that do not allow the user to select arbitrary settings on different subsystems (which would lead to system instability).
For it's its [[:Category:Naon|Naon]] platform, Dave provides a ''custom'' PM driver that allows for selection, at runtime, of an OPP for each subsystem (Cortex A8, CORE, DSP, HDVICP) providing a default stable voltage/frequency setting. Some OPPs are directly derived from the ones officially supported by TI (see DM814x TRM at DVFS section, for example) and some other custom OPPs provided by Dave.
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