Re: "Non-volatile" OS ?
- From: "Thomas Magma" <somewhere@xxxxxxxxxxxxxxxxxx>
- Date: Fri, 26 Aug 2005 15:10:03 GMT
A Pocket PC kind of does this (Windows CE). That is, when you turn your PDA
off the OS and apps are still intact when you turn it back on. All a PDA
doing is battery backing it's RAM. The OS will last weeks on a charge and a
lot more with a slightly bigger battery.
Thomas
<drn@xxxxxxxxxx> wrote in message
news:1125009333.100926.295480@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Hi All - I'm looking for a "non-volatile" OS.
> Perhaps there's a more common name ?
> Anyway, here's what I'm looking for, to support
> an embedded system that operates in a "flakey"
> power environment where power has a nasty
> tendancy to kinda disappear for a while...
>
> - On power-down, OS supports QUICK save of
> state of all processes, and
> - On power-up, OS restores in-progress processing
> and messages tasks that "there was a power
> event, reinitialize as required".
>
> What I did in past was use battery-backed
> static RAM, and write my own OS. That's a
> bit dated in approach, though lots of units
> in service !
>
> Application scale:
> - 32-bit
> - tens of MB of RAM and code (not GB).
> - need GCC toolchain
> - usual drivers (USB, etc)
>
> Ideas:
> - hardware uses super-cap, plus alerting
> so OS has time to save the world (and doesn't
> really start until super-cap is loaded),
> - hardware could serialize state to/from
> serial flash into fast/cheap dynamic RAM,
>
> This has got to be a solved problem with
> some readily available embedded OS, no ?
> Ideally some Linux variant ?
>
> Any thoughts and ideas appreciated !
> Thanks in advance,
> Best Regards, Dave
>
.
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