Re: RAM persistence

One thing he was "wrong" about is that you should get more space out of your
64M of ram.

Simply add "mem=64M" to you boot args.

On Wednesday 20 June 2001 16:19, Arnault Claden wrote:
> Le Wed, 20 Jun 2001 13:43:17 -0500
> Kevin Holbrook <holbrook@metrowerks.com> ecrivit a Familiar
>
> <familiar@handhelds.org> :
> > Sorry for asking what is probably a very dumb question,
> > but are items written to a ramfs supposed to be persistent?
>
> Nope. In case of powerfailure, you lose everything. Turning it off by
> pushing the button is not considered powerfailure. Reset and On/Off switch
> IS ;)
>
> > Is this equivalent to the standard RAM disks on Linux or
> > is this a specialized filesystem driver?
>
> I guess the ramdisk is the closest match.
>
> > I was wondering how items were written to flash RAM
> > to be persistent.
>
> I think it's the purpose of the jffs, which means, I guess : Journaling
> Flash FileSystem
>
> How it comes to be persistent ?
>
> The answer is pretty staightforward :
>
> 1. Use of a journaling filesystem to save as often as possible every
> changes
> 2. jffs driver has, builtin, the flashing code, so that it continuously
> (sort of) flashes changes to the ROM
>
> Maybe it's not that simple, and maybe I'm completely mistaken, but I think
> it's the thing to do (my own opinion, and I'm absolutely not part of the
> development team : I'm not gifted enuff for it ;) )
>
> > I was also wondering why I only have access to 16Mb of
> > the 64MB on the iPaq 3670 as well via the ramfs.
>
> The system needs RAM to work properly. I've been asking myself the same
> question (though I only have 32Mb on my H3630), but it's pretty obvious
> that an OS can't work without RAM.
>
> Hope I'm not entirely wrong ...
>
> cyaz
>
> A.

-- 
Joseph J. McCarthy, Assistant Professor
Department of Chemical and Petroleum Engineering
University of Pittsburgh
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