From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kevin Hilman Subject: Re: ARM suspend to disk? Date: Thu, 29 Apr 2010 10:58:40 -0700 Message-ID: <87y6g6w373.fsf@deeprootsystems.com> References: <4BD881A7.2020402@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from mail-pw0-f46.google.com ([209.85.160.46]:62031 "EHLO mail-pw0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758698Ab0D3SWX (ORCPT ); Fri, 30 Apr 2010 14:22:23 -0400 Received: by pwj9 with SMTP id 9so314334pwj.19 for ; Fri, 30 Apr 2010 11:22:22 -0700 (PDT) In-Reply-To: <4BD881A7.2020402@gmail.com> (Peter Tseng's message of "Wed\, 28 Apr 2010 14\:42\:47 -0400") Sender: linux-omap-owner@vger.kernel.org List-Id: linux-omap@vger.kernel.org To: Peter Tseng Cc: linux-omap@vger.kernel.org Peter Tseng writes: > I last posted a few weeks ago; I'm Peter Tseng, using the Gumstix Overo > for a project. I'm interested in power management and a few related > things. A few of the things I am interested in are suspend to disk and > snapshot boot. > > I found a page on elinux.org with a few notes on the issue for ARM. > However, it looks to be a bit outdated: > http://elinux.org/Suspend_To_Disk_For_ARM > > I am wondering how applicable anything on this page is to the current > omap-pm developments. Or, if not, any pointers on how it might be done - > for example, if I felt like I should do some hacking to try to get this > working and contribute these back, a general outline of what I might > have to do) Not really and answer to your question since I don't know the answer, but just curious about your goals, since there may be an easier way. What do you expect to gain from suspend-to-disk + snapshot boot that you don't already get from suspend-to-RAM using off-mode? On OMAP, with off-mode enabled, a suspend to RAM puts the entire OMAP into full-chip off, and essentially reboots the ARM when waking up from suspend (or idle) already. Kevin