Hello,

Is it possible to store a file in the NAND-Flash, maybe called "test.txt".

I want to write it at an special address and read it back another time from the address.

Is it possible ?


I need direct access to the NAND...

Thank you.

M. Sahm

Why don't you use e.g. buildroot initial rootfs image generator?

You can modify FS content before making final image!

P.S. You can additionally try to copy data from NAND using u-boot `nand` comand and then use kernel mtd module!

Hello,

I need to access the nand at runtime to store/read data from it.

Do I have to make a PARTITION to use the mtd utils in linux.
A Partition builds /dev/mtdX and /dev/mtdXro and /dev/mtdblockX

or could I use this functions like nandwrite to write to an specified address like 0x100000 ?

and...

how could I make the /dev/mtdX write protected ?

Thank you very much

You can simply seek/read/write on /dev/mtdX i think
Anyway look through http://www.linux-mtd.infradead.org/faq/nand.html, especially read about bad block handling during NAND operations!!!

About write-protection. NAND flash provide special WP pin - you сan use it after final flash modification. I think that kernel will recognize such situation and block /dev/mtdX write operation/

Mount the NAND's mtd device as jffs2 filesystem and use it just as a regular media. jffs2 handles bad-blocks, wear-levelling etc automatically and you save youself from a lot of trouble.
If needed, you can create multiple partitions. Just provide required parameters from kernel command line with partition offsets and sizes.