3,260
edits
Changes
m
→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 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 are provided by Dave.
{| class="wikitable"
