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Re: RE: readonly file system



One way to check the amount of memory used/left:
cat /proc/meminfo

To check how much flash available, look at the
output from make images:
...
padflashimage 0x5f0000 flash1.img
**** Adding 3134596 $ff-bytes as alignment to get 6225920 (0x5f0000)
..

The amount it adds as alignment is the amount available for more
applications in the cramfs partition.

/Johan


----- Original Message ----- 
From: <Nathan.Smith@xxxxxxx.gov>
To: "Mikael Starvik" <starvik@xxxxxxx.com>
Cc: "Mark Richards" <mark.richards@xxxxxxx.com>; "dev-etrax"
<dev-etrax@xxxxxxx.com>
Sent: Tuesday, July 13, 2004 3:39 PM
Subject: Re: RE: readonly file system


> > tmpfs on /var  - Read/write filesystem lost on each reboot
> > jffs on /mnt/flash (etc is symbolic link to /mnt/flash/etc) -
> > Read/write filesystem in flash that is not lost at reboot.
> > crams on / - Read only filesystem. No way to make it read/write
>
> Filesystem                Size      Used Available Use% Mounted on
> rootfs                    6.5M      6.5M         0 100% /
> /dev/flash3               6.5M      6.5M         0 100% /
> /dev/flash2               2.6M    360.0k      2.3M  13% /mnt/flash
> tmpfs                     7.0M    120.0k      6.9M   2% /var
>
> So the tmpfs is 7.0 M, the jffs is 2.6 M, but I don't understand the
> size of the crams on /. Two filesystems show up as mounted on / that are
> the same size, does that mean they are the same?
>
> A product info sheet for the 82/83 says there is 6 meg Flash memory with
>  4-4.5 meg available for custom applications. It also says there is 16
> meg RAM. Where do these sizes fit into the list of filesystems? Is RAM
> the tmpfs, in which case the system has about 8 megs for running
> applications?
>
> I'm trying to get a feel for how much space I have left until I start to
> run out for new programs/program data.
>
> Thanks,
> Nathan
>
> ----- Original Message -----
> From: "Mikael Starvik" <mikael.starvik@xxxxxxx.com>
> Date: Tuesday, July 13, 2004 1:51 am
> Subject: RE: readonly file system
>
> > >I see that, with the web-based configuration in the AXIS 82, various
> > files
> > >can be edited and saved back to the filesystem image (on the ETRAX
> > ROM?).
> > >This seems a little far-fetched, but is it possible that these
> > changes>become permanent?
> >
> > There are three filesystems:
> >
> > tmpfs on /var  - Read/write filesystem lost on each reboot
> > jffs on /mnt/flash (etc is symbolic link to /mnt/flash/etc) -
> > Read/write filesystem in flash that is not lost at reboot.
> > crams on / - Read only filesystem. No way to make it read/write
> >
> > /Mikael
> >
> > -----Original Message-----
> > From: owner-dev-etrax@xxxxxxx.com">mailto:owner-dev-etrax@xxxxxxx.com] On
> > Behalf Of Mark Richards
> > Sent: Tuesday, July 13, 2004 2:00 AM
> > To: dev-etrax
> > Subject: readonly file system
> >
> >
> > I have a requirement to make a change to an iptables script during
> > ETRAXoperation, then unload and reload iptables to the script's new
> > settings.In
> > order to do this, I need to disable the read-only file system during
> > various
> > file modification operations, then turn it back on.
> >
> > I see that, with the web-based configuration in the AXIS 82, various
> > files
> > can be edited and saved back to the filesystem image (on the ETRAX
> > ROM?).
> > This seems a little far-fetched, but is it possible that these changes
> > become permanent?
> >
> > What are the recommendations or standard procedures for modifying
> > files(within the ETRAX's rom-based linux O/S) so that changes will
> > not be
> > lost on
> > reboot?
> >
> > Mark Richards
> >
> >
> >
>