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PM / Hibernate: add section for resume options

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Expand the existing documentation to explicitly list the options for
resuming a hibernation image, including the manual resume option which
can be used from the initrd or initramfs and the kernel init resume.

Signed-off-by: Sebastian Capella <sebastian.capella@linaro.org>
Acked-by: Rob Landley <rob@landley.net>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Sebastian Capella 2013-08-26 14:54:49 -07:00 committed by Jiri Kosina
parent 9ed354b732
commit 1c93669929
1 changed files with 14 additions and 1 deletions
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15
Documentation/power/swsusp.txt
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@ -50,6 +50,19 @@ echo N > /sys/power/image_size
before suspend (it is limited to 500 MB by default).
. The resume process checks for the presence of the resume device,
if found, it then checks the contents for the hibernation image signature.
If both are found, it resumes the hibernation image.
. The resume process may be triggered in two ways:
1) During lateinit: If resume=/dev/your_swap_partition is specified on
the kernel command line, lateinit runs the resume process. If the
resume device has not been probed yet, the resume process fails and
bootup continues.
2) Manually from an initrd or initramfs: May be run from
the init script by using the /sys/power/resume file. It is vital
that this be done prior to remounting any filesystems (even as
read-only) otherwise data may be corrupted.
Article about goals and implementation of Software Suspend for Linux
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@ -326,7 +339,7 @@ Q: How can distributions ship a swsusp-supporting kernel with modular
disk drivers (especially SATA)?
A: Well, it can be done, load the drivers, then do echo into
/sys/power/disk/resume file from initrd. Be sure not to mount
/sys/power/resume file from initrd. Be sure not to mount
anything, not even read-only mount, or you are going to lose your
data.