Howto write to flash from user space (II)

[Josh Boyer]

On Thu, 2004-10-21 at 11:24, bodhi at despammed.com wrote:
> I already read http://www.linux-mtd.infradead.org/
> but I found no useful informations

There's all kinds of useful information on there...  for MTD developers
;).

> How can I write directly into flash from an user space application ?

Using either /dev/mtdblock (CONFIG_MTD_BLOCK) or /dev/mtd
(CONFIG_MTD_CHAR).

You might also want to look into JFFS2 if you haven't already.

> I am using a SA1110 with 16MB StrataFlash.
> I tried using /dev/mem but I can only read and not write to flash.

That's for DRAM only.

> I do not have any /dev/mtd* device in my /dev , why ?

You need to configure MTD into your kernel, and create the /dev nodes if
you aren't using devfs or udev.  The MAKEDEV script in the utils
directory helps with that.

> Do I need to develop a driver ?

No, StrataFlash is handled by the cfi_cmdset_0001 driver
(CONFIG_MTD_CFI_INTELEXT).

Also, the more information you give us, the more help we can provide. 
The board and flash chip types are a great start.  If you are still
having trouble, let us know what version of the kernel, what MTD
snapshot, etc.

josh