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Re: AW: [Proposal & Patch] enhancing redboot/fis for failsafe flash updates
- From: Roland CaÃebohm <roland dot cassebohm at VisionSystems dot de>
- To: ecos-discuss at ecos dot sourceware dot org
- Cc: "Neundorf, Alexander" <Alexander dot Neundorf at jenoptik dot com>
- Date: Wed, 20 Oct 2004 09:31:49 +0200
- Subject: Re: AW: [ECOS] [Proposal & Patch] enhancing redboot/fis for failsafe flash updates
- Organization: Vision Systems GmbH
- References: <5A8A17126B73AC4C83968F6C4505E3C5012C2CA9@JO-EX01.JENOPTIK.NET>
Am Donnerstag, 14. Oktober 2004 08:23 schrieb Neundorf,
Alexander:
> Hi,
>
> > Von: Roland CaÃebohm
> > [mailto:roland.cassebohm@VisionSystems.de]
> >
> > Hi,
> >
> > I have looked at your code and I think it is a great idea
> > to use the fis directory as a filesystem.
> >
> > Wouldn't it be fantastic to have it as one of the
> > supported filesystems in eCos (located in
> > packages/fs/fis)?
> >
> :-)
>
> That's my intention. It's only that I didn't get around yet
> to turn it into a real ecos fs.
>
> > This would be a general possibility for applications to
> > make firmware updates.
>
> Yes. The fisfs would be read-only, and there would be some
> special functions for updating. It should not replace jffs2
> in any way. fisfs is intended as an updatable read-only fs,
> while jffs2 supports real read-write.
>
> > And therefor in RedBoot should be similar command like
> > the fis commands, and from applications it should be used
> > as filesystem. Or altanativ RedBoot could get commands to
> > create and delete files in a mounted filesystem such as
> > jffs2, but use instead the minimalist filesystem.
>
> Well, with my implementation almost nothing has to be done
> in redboot, all the docs and knowledge remain valid. And
> since it is basically RO, i.e. only updated during firmware
> updates, I chose not to put fragmentation and space
> allocation in the fisfs algorithms. It only makes sure that
> you don't overwrite stuff.
Yes, you are right, it would be the best to have something,
which would work with less changes as possible to the actual
behavior.
Roland
--
___________________________________________________
VS Vision Systems GmbH, Industrial Image Processing
Dipl.-Ing. Roland CaÃebohm
Aspelohe 27A, D-22848 Norderstedt, Germany
http://www.visionsystems.de
___________________________________________________
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