• 07/14/2017
  • Public Content

Support for Platform Standby (S0i3) Entry and Exit

Linux system can be forced to a low power state by writing a state value to
/sys/power/state entry
. Ref-OS-IoT supports “freeze” state where the system is put into S0ix state and all OS timer activities are suspended. The system wakes up from this state only for certain wake signals like keyboard/mouse event, RTC event, uSD card connection/disconnection, etc.
To force the system into suspend state:
echo freeze > /sys/power/state
In case all runtime pm conditions are met (for instance, all CPUs are in deepest power save state) and all gating devices are in D3 state, the system can also enter the S0ix state automatically between wake events (e.g. timer events).

Product and Performance Information


Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804