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Power Management
ckuethe edited this page Mar 22, 2015
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- cpu governors
- cpuidle
- cpufreq - nope, not supported on IMX5 (https://www.kernel.org/doc/Documentation/cpu-freq/user-guide.txt)
- over-/under-clocking?
- u-boot setup?
- something that linux can do?
- might to be something uboot does
- hibernate/resume to disk?
- https://wiki.archlinux.org/index.php/Suspend_and_hibernate
- http://elinux.org/ARM_Hibernation
- http://elinux.org/Suspend_To_Disk_For_ARM
- http://www.spinics.net/lists/arm-kernel/msg125975.html
- https://www.kernel.org/doc/Documentation/power/basic-pm-debugging.txt
- https://wiki.debian.org/Suspend
- https://wiki.ubuntu.com/DebuggingKernelHibernate
Short version: hibernate and resume work, but the MMC controller is initialized after the power management framework. With patched init scripts it is possible to resume fairly early in the boot process. Still investigating how to make MMC initialize sooner.