Re: SPI Flash

[Duke <ezbonites@gmail.com>]

On 12/18/07, Duke <ezbonites@gmail.com> wrote:
> On 12/18/07, Nicolas Ferre <nicolas.ferre@atmel.com> wrote:
> > Duke :
> > > Hi all,
> > > Has anyone use ST's SPI flash and Atmels SPI DataFlash suscessfully?
> >
> > Atmel DataFlash are working on Linux with this configuration in your
> > .config :
> > CONFIG_MTD_DATAFLASH=y
> >
> > > How does the interface look from userspace? Is it still an mtdblockX
> > > device or is it a spi device node?
> >
> > It is seen as a mtd device :
> > # cat /proc/mtd
> > dev:    size   erasesize  name
> > [..]
> > mtd2: 00840000 00000420 "spi0.0-AT45DB642x"
> >
> > So you can mount is using mtdblockx interface.
>
> Thanks,
> Various DataFlash cards have different size alterable, is this
> supported my the mtd driver? Let say I want to have a section that I
> never want altered, do I need to do partition the dataflash
> accordingly so this section wouldn't be erased, or I don't need to do
> that? Taken into consideration the filesystem limit on block sizes.
>
> Do you know if this is the same for all spi flash chips that may not
> be from atmel?
>

Sorry, I ment Chips, not Cards (I don't indent to use DataFlash Cards).