NAND Flash with FATFS in STM32Cube4

[Paul J Kim]

Posted on January 13, 2017 at 11:21

Is there any good starting point to implement a FATFS on NANDFlash ?

The CubeMX has generated FATFS related files but there is no option for NAND flash.

#fatfs

[Imen.D]

Posted on January 13, 2017 at 12:55

Hello

H_Kim.Paul_Jay

‌,

NAND Flash is not supported by CubeMx as mentioned in the

http://www.st.com/content/ccc/resource/technical/document/user_manual/10/c5/1a/43/3a/70/43/7d/DM001047pdf/files/DM001047pdf/jcr:content/translations/en.DM001047pdf

FatFs section:

NOR and NAND Flash memory are not supported. In this case, the user shall select the FatFs user-defined mode and update the user_diskio.c driver file generated to implement the interface between the middleware and the selected peripheral.

Regards

ImenD

[stm322399]

Posted on January 13, 2017 at 15:20

FatFs does not run efficiently on NAND without flash translation layer.

Because of the large size of erase sector (128KB is very common these days), a naive port of FatFs on NAND will wear out the first sector (frequent FAT updates) and run dramatically slow (when individual 512 bytes sector are updated by copying a whole 128KB erase block).

[Paul J Kim]

Posted on January 14, 2017 at 04:06

thanks for the comment.

[Paul J Kim]

Posted on January 14, 2017 at 04:10

thanks for the comment.

I am working on converting some spl NAND example to HAL NAND example first. It works fine now.

If I finish NAND FATFS, I will look over the performance issue. But I have no choice to use others but NAND Flash at this moment.

[Tesla DeLorean]

Posted on January 14, 2017 at 05:53

Well the real issue here is just how unmanageable 128KB of data will become when you need to insert a KB in the middle...

Maybe FAT isn't the best choice here?