Title: Power management demo
Description:
A sample implementation of a power manager app that uses the zephyr
power management infrastructure.
This app will cycle through the various power schemes at every call
to _sys_soc_suspend() hook function.
It will cycle through following policies
1. Low Power State (LPS) - puts the CPU in C2 state
2. Device suspend only - demonstrates hooks into kernel idle entry and exit
that can be used to only suspend devices without CPU or SOC PM operations.
3. No-op - no operation and letting kernel do its idle
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Building and Running Project:
This application is architecture and SoC specific. It is written for x86
architecture and uses features specific to quark_se platforms.
This is a microkernel only project since the zephyr power management
infrastructure currently is only microkernel idle based. In future, when
nanokernel idle is supported, a separate nanokernel app would be created.
make BOARD=<quark_se board>
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Troubleshooting:
Problems caused by out-dated project information can be addressed by
issuing one of the following commands then rebuilding the project:
make clean # discard results of previous builds
# but keep existing configuration info
or
make pristine # discard results of previous builds
# and restore pre-defined configuration info
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Sample Output:
Power Management Demo
Low power state policy entry!
Low power state policy exit!
Total Elapsed From Suspend To Resume = 163838 RTC Cycles
Device suspend only policy entry!
Device suspend only policy exit!
Total Elapsed From Suspend To Resume = 163838 RTC Cycles
...
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