Nand flash write from userspace application

Raw write to MTD is not possible due to bad block handling. There are some command line utilities like nandwrite and nanddump. I am however looking for a library which implements this functionality. I notied a libmtd, but this does not seem to be usable for NAND flash.

Is anybody aware of a library which can be used for userspace read/write of NAND flash ?

Originally Posted by prutser60 I notied a libmtd, but this does not seem to be usable for NAND flash.

What's your basis for that conclusion?
I've never used libmtd, but that seems to be an illogical conclusion.
Libmtd purports to be for "manipulating MTD devices". MTD is an abstraction layer for raw flash devices. NAND is a type of raw flash device.
Ergo libmtd should be able to access NAND flash.

A quick scan of source code for libmtd/mtdlib.c found comments and routines for reading and writing NAND (and even seems to check for bad blocks, e.g. uses MEMGETBADBLOCK ioctl).

Consider using UBI volumes instead of just MTD.

Regards

The MTD layer does not handle bad blocks. That's f.i the reason that UBI exists on top of MTD.

My conclusion was based on the the libmtd source code. The read and write functions do not handle bad blocks (e.g. skip them) (unless of course I overlooked something)
The only relation with nand I found was indeed the MEMGETBADBLOCK ioctl, which was used in a function to check if a block was marked bad.

Of couse a NAND aware file system is the way to go, but if you want to ba able to write raw flash from an application (e.g. to update
a kernel) then you need to be able to deal with bad blocks.