Benefits of Suspend to Ram

A significant part of the system boot time is taken up in the initialization of the application, including loading of libraries and data (DNN and map files). Achieving the boot time target in cold-boot for all use-cases is difficult.

A way around this is to keep the DRAM pre-loaded and initialized before the system needs to be a fully functional state. Rather than keep the system powered off when not in use, it retains the system in SC7 state (which minimizes the power consumption while keeping the DRAM loaded and most of the software initialized).

With SC7, data is loaded and applications are initialized (example: DNN unpacking) before suspend that does not require external interaction. When it resumes, the application programs the external sensor and the rest of the application init. Since most of the initialization, which is I/O and CPU intensive, happened before suspend, the visible time is only the resume time (and much less compared to cold boot) for the end user.

• Suspend to Ram Mechanism
  • Suspend to Ram Sequence