Extending the swsusp Hibernation Framework to ARM - The Linux ...

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AM33xx Hibernation Support• With prep work done, adding hibernation support to AM33xx is actuallyfairly straightforward• begin/end wrap all hibernation code• We use disable/enable_hlt to preventpm_idle from being called• The enter call back just powers downthe machine• These calls make sure that thehardware is in the same state beforerunning the restored image as when itwas made
AM33xx Hibernation Support●●●pre_snapshot saves all our state registers and prepares the GPIOsfor power lossleave is called after restoring an image. We inform the powerdomains that they have lost power and we restore our wkup contextfinish is called both afterrestoring an image (after leave)and after snapshotting thesystem. We continue ourcontext restore and also undothe actions in pre_snapshot
Page 3 and 4: Motivation• Hibernation provides
Page 5 and 6: swsusp
Page 7 and 8: OMAP PM• Clocks- Clock gating•
Page 9 and 10: WKUP Context• Used for:- Power, r
Page 11 and 12: PRCM• Reset state and module stat
Page 13 and 14: PRCM• Clocks- Leverage the clock
Page 15 and 16: pinctrl• Temporary measure, list
Page 17 and 18: pinctrl• Current solution is a bi
Page 19 and 20: SRAM• Internal memory on many OMA
Page 21 and 22: Other Devices• Many devices that
Page 23 and 24: Other Devices• Some device *do* n
Page 25 and 26: Hibernation support for ARM• Mini
Page 27: Hibernation support for ARM• swsu
Page 31 and 32: Restore from U-Boot31
Page 33 and 34: Kernel Modifications• U-Boot does
Page 35 and 36: swsusp Image Layout●●Each metad
Page 37 and 38: U-Boot Memory Mapping• The U-Boot
Page 39 and 40: Loading swsusp Pages Into Memory•
Page 41 and 42: Copy Remaining Pages• Moved remap
Page 43: Introducing:The Next-Gen BeagleBone

Extending the swsusp Hibernation Framework to ARM - The Linux ...

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