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I am trying to save maximum energy for a certain embedded Linux application. Currently I am using Raspberry Pi. But it looks like Raspberry Pi doesn't support Suspend to RAM. What alternative embedded Linux platforms can support this feature?

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You could try one from the Wikipedia page en.wikipedia.org/wiki/Embedded_Linux ,perhaps Maemo could do it. –  Aaditya Bagga Aug 27 '13 at 17:06
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2 Answers

You should look to side of Live CD.

Often there is exist such option: "boot to ram".

You can boot from live cd or usb stick, even from hard drive to RAM. In this way, your system need no suspend to RAM, it is "installed" in RAM. No disk required.

You can save much disk requests and increase whole speed of you linux in more than 5x. But you will lose your RAM.

If you are rich of RAM, e.g. >2Gb, this is perfect solution for you.

Read "man live-build" and "man live-boot"

live-build - the Debian Live tool suite

and

live-boot - System Boot Scripts

......

ramdisk-size This parameters allows to set a custom ramdisk size (it's the '-o size' option of tmpfs mount). By default, there is no ramdisk size set, so the default of mount applies (currently 50% of available RAM). Note that this option has no currently no effect when booting with toram.

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There is a difference between boot into and suspend to. –  ott-- Aug 27 '13 at 15:56
    
I'm agree, mine is like a "To fire a cannon at sparrows." –  innocent-world Aug 27 '13 at 16:05
    
My purpose is to save energy. Booting into and Running in RAM all the time doesn't seem to solve the problem. –  xiaobai Aug 27 '13 at 16:55
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You can have a look at the beaglebone black: http://beagleboard.org/Products/BeagleBone%20Black which is not that expensive and can suspend to ram just fine.

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