OESF Portables Forum

Everything Else => Zaurus - Everything Development => Distros, Development, and Model Specific Forums => Archived Forums => User Request for Applications => Topic started by: rolf on October 17, 2006, 07:34:39 am

Title: Hibernate For The Z?
Post by: rolf on October 17, 2006, 07:34:39 am

Hi,

I was wondering if it was possible to program something similar to the hibernate command for Linux computers.  hibernate saves the state of RAM and stores it on the swap partition AFAIK.  In any case, when the computer is awoken from this hibernate state it boots up, recognizes the hibernate file being present and restores the session.  

This makes it possible for example to hibernate a laptop, switch the battery and turn it back on without loosing any work (even stuff that is not saved).  Shouldn't it be possible to have something similar for the Z?

Hibernate is just a bash script on the desktop.  Despite looking at it I was unable to find out exactly what command it is that invokes the hibernation and if that command is already present for the Z.

Regards

Rolf

Title: Hibernate For The Z?
Post by: lardman on October 18, 2006, 05:21:44 am

See this page for a comparison of the 3 methods: http://www.suspend2.net/features (http://www.suspend2.net/features)

Is this really very useful as the battery life of a Zaurus is fairly reasonable? I could see that perhaps it could be used to automatically save state if you forget to charge the battery.

Nevertheless, it's an interesting thought/project.


Si

Title: Hibernate For The Z?
Post by: rolf on October 18, 2006, 05:41:31 am

> Is this really very useful as the battery life of a Zaurus is fairly reasonable?

Not for the collie.  Which is why I was asking.

> http://www.suspend2.net/features (http://www.suspend2.net/features)

Thank you for the link.  Alas, it only talks about 2.6 which again creates problems for the collie.

There was somebody from China on IRC yesterday that was interested in this.  Let's see how this develops.

Title: Hibernate For The Z?
Post by: lardman on October 18, 2006, 06:43:50 am

Well I assume there were solutions/patches available for the 2.4.x kernels, try some googling. For example there's this: http://www.suspend2.net/oldnews#final24release (http://www.suspend2.net/oldnews#final24release)


Si

Title: Hibernate For The Z?
Post by: rolf on October 18, 2006, 06:59:44 am

Thank you again, lardman.  So this is just an issue of recompiling the kernel?  Fair enough.

Title: Hibernate For The Z?
Post by: lardman on October 18, 2006, 07:43:32 am

Quote

just

I don't think ARM was on the list of supported processor types, therefore it'll be more a case of patching the kernel, which may be more difficult. I don't know how the suspend stuff hooks in so I can't comment on how difficult it'd be.


Si

Title: Hibernate For The Z?
Post by: Meanie on October 18, 2006, 08:35:43 am

I might be wrong here but I thought the hibernate stuff required the APIC functionality on the MB ?

Title: Hibernate For The Z?
Post by: koen on October 18, 2006, 10:30:30 am

Quote

I might be wrong here but I thought the hibernate stuff required the APIC functionality on the MB ?
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You're forgetting that x86 is an ugly architecture that wasn't designed for power-efficiency. Suspend-to-disk requires only some help from the bootloader and kernel on ARM.

Title: Hibernate For The Z?
Post by: rolf on January 01, 2007, 11:40:58 am

Quote

Suspend-to-disk requires only some help from the bootloader and kernel on ARM.

What kind of help would that be exactly?

Title: Hibernate For The Z?
Post by: svs57 on May 17, 2007, 03:27:14 am

Look here:
http://tree.celinuxforum.org/CelfPubWiki/SuspendToDiskForARM (http://tree.celinuxforum.org/CelfPubWiki/SuspendToDiskForARM)
Arm patches for 2.6.14
I didn't try because I use 2.6.21 kernel.