Re: How can I prevent MTD to access the end of a flash device ?

[Nicolas Pitre <nico@cam.org>]

On Sun, 23 Apr 2006, Franck Bui-Huu wrote:

> Nicolas,
> 
> 2005/11/22, Nicolas Pitre <nico@cam.org>:
> > On Tue, 22 Nov 2005, Franck wrote:
> >
> > > Hi,
> > >
> > > I have two questions that I can't answer by my own. I tried to look at
> > > FAQ and documentation on MTD website but found no answer.
> >
> > Please consider using the MTD mailing list next time (you certainly read
> > about it on the MTD web site).
> >
> > > First question is about size of flash. I have a Intel strataflash
> > > whose size is 32MB but because of a buggy platform hardware I can't
> > > access to the last 64KB of the flash. How can I make MTD module aware
> > > of this new size. The restricted map size is initialized by my driver
> > > but it doesn't seem to be used by MTD.
> >
> > The easiest thing to do is to define MTD partitions, the last one being
> > the excluded flash area.
> >
> 
> I hope you don't mind if I continue this thread 5 months later...I put
> this issue in my TODO list and now I really need to fix it.
> 
> Your advice seems fine, but it brings some restrictions on flash
> concatenations: for example, if I have 2 flashes of 32Mbytes, I need
> to create 2 partitions whose sizes are 32M - 64K bytes but then I
> can't concatenate these two partitions anymore since concatenation
> works with mtd devices, not partitions, does it ?

MTD partitions are MTD "devices" as well.


Nicolas