all versions of linux 2.6 kernel support hibernation (which means saving contents of memory disk, shutting down pc completely. next time pc physically powered on, part of boot process old contents of memory read disk, restoring previous session such open browser windows, applications, , else being done. - "[hibernation] implemented swsusp built 2.6 [linux kernel] series.")
however, raspberry pis have no acpi support (advanced configuration , power interface) nor include pmic (power management ic, part of soc perhaps isn't 1 in pis).
so, given state of affairs, think it's still possible pis hibernate anyway? why or why not?
realize pretty pointless, @ end of hibernation process have ... running, shut-down pi ready physically powered down. i'm curious prevents this?
make sense if there kind of external chip (maybe powered arduino) waited until pi shut down (maybe gave 2 minutes so), , physically interrupted power until needed again.
sleepypi seems along these lines, i'm not sure if hibernates or shuts down:
-> https://www.google.com/search?q=does+sl ... +shut+down
doesn't answer in first 2 pages of results.
faq seems imply complete shutdown (not hibernate): http://spellfoundry.com/sleepy-pi/sleep ... spberry_pi
seems sleepy pi along these lines - reason shuts down pi instead of hibernating it.
proper hibernate command possible? why or why not? physically preventing it, if kernel supports it? understanding it's special shutdown sequence , special boot sequence.... don't see why wouldn't work on pi, other having interrupt power manually once has had time complete....
(please correct mistakes made above.)
however, raspberry pis have no acpi support (advanced configuration , power interface) nor include pmic (power management ic, part of soc perhaps isn't 1 in pis).
so, given state of affairs, think it's still possible pis hibernate anyway? why or why not?
realize pretty pointless, @ end of hibernation process have ... running, shut-down pi ready physically powered down. i'm curious prevents this?
make sense if there kind of external chip (maybe powered arduino) waited until pi shut down (maybe gave 2 minutes so), , physically interrupted power until needed again.
sleepypi seems along these lines, i'm not sure if hibernates or shuts down:
-> https://www.google.com/search?q=does+sl ... +shut+down
doesn't answer in first 2 pages of results.
faq seems imply complete shutdown (not hibernate): http://spellfoundry.com/sleepy-pi/sleep ... spberry_pi
seems sleepy pi along these lines - reason shuts down pi instead of hibernating it.
proper hibernate command possible? why or why not? physically preventing it, if kernel supports it? understanding it's special shutdown sequence , special boot sequence.... don't see why wouldn't work on pi, other having interrupt power manually once has had time complete....
(please correct mistakes made above.)
nobody has tried - thats all. testing such thing would
involve repeatedly compiling kernel and
other parts of raspbian , original research on
(arm ? linux ? debian ?) powersave modes on raspberries since
no resources on topic exist. puts
people off.
note when original research mean also
fail in finding solution. puts people off.
favor system external micro
involved.
ghans
involve repeatedly compiling kernel and
other parts of raspbian , original research on
(arm ? linux ? debian ?) powersave modes on raspberries since
no resources on topic exist. puts
people off.
note when original research mean also
fail in finding solution. puts people off.
favor system external micro
involved.
ghans
raspberrypi
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