RE: [ECOS] FLASH file system

["Simpkins, Andy" <Andy dot Simpkins at Transcomm dot uk dot com>]

On the surface it looks like JFFS2 is just what I am looking for...

Can someone point me in the direction for JFFS2 documentation and source?
All I can find is the red hat announcement on the device and the a build for
use with the 'familiar platform' ipaq.

that should enable me to determine if this is the right thing for me to
pursue.

Has anyone (or is anyone in the process of) ported JFFS2 to eCos.
again the red hat announcement indicated that a port was soon to follow the
Linux release...


Andy

> -----Original Message-----
> From: Simpkins, Andy 
> Sent: 03 September 2001 10:18
> To: 'Andrew Lunn'; Simpkins, Andy
> Cc: eCos-Discuss (E-mail)
> Subject: RE: [ECOS] FLASH file system
> 
> 
> Andrew,
> 
> What I am looking for is something like the following...
> 
> - Ability to read and write files to FLASH
> - Because BLOCK size in flash is typically quite large (>64K) 
> then it is desirable to split blocks into sub-blocks of a 
> more reasonable size.  
> - This now leaves the problem of erasing (as the smallest 
> erase size is 1 block).
> - By leaving 1 Block free space in the file system at all 
> times it is possible to 'juggle' data around (i.e. 
> defragmenter) such that sub-blocks no-longer in use may be 
> freed up for re-use.
> - Obviously this will require 1 (or 2) blocks (possibly of a 
> smaller size) to maintain the FAT.
> 
> 
> Do you or anyone else know of such a module available in open source?
> 
> If not then I shall have to write one.  Cue Red Hat to tell 
> me about what they would like to see me provide :-)
> 
> Andy
> 
> 
> > -----Original Message-----
> > From: Andrew Lunn [mailto:andrew.lunn@ascom.ch]
> > Sent: 03 September 2001 09:34
> > To: Simpkins, Andy
> > Cc: eCos-Discuss (E-mail)
> > Subject: Re: [ECOS] FLASH file system
> > 
> > 
> > On Mon, Sep 03, 2001 at 09:25:45AM +0100, Simpkins, Andy wrote:
> > > Hi there,
> > > 
> > > Does anyone know if there is an eCos FLASH file handling 
> > module (i.e. treats
> > > FLASH as a disk)
> > 
> > The ROM FS can run this the FS in FLASH. Its read only. Is 
> > that what you mean?
> > 
> > Or do you mean using the flash as a block device? You open 
> /dev/flash
> > and read blocks and write blocks? Im not sure that would be very
> > efficient. The flash on my device has 256k blocks.
> > 
> >         Andrew
> > 
>