NAND flash programming

Sarah Saeed

Hi,

I once have run the attached test for nandflash programming on EVM6424 and it worked successfully. I then tried to run it again and it failed.

The test erases NAND, wirtes, reads, then compare what has been written with what is read. If found different, then a page is counted as bad, and after some limit, I receive the error " Error: Too many bad pages".

I followed program execution, and I found that, the first block of the NAND is successfully written, however, when the second block is started, the program exits after the above mentioned error message.

Note: The jumper2 is at NAND position, SW1 boot mode indicates NAND flash (0111), memory width is 16bit, and SW2 indicates 8-bit EMIF NAND flash. (I have tested many configurations of the switches to check if a hardware change is the cause of the error).

Can you help to explain, what happened, and how to fix?

BR,

Sarah

nandflash.rar

over 10 years ago

0 Arvind Singh over 10 years ago

Mastermind 6115 points

Hi Sarah,

At what time you are getting this error, the time of writing to NAND or at the time of reading from NAND.
have you tried with any flash utility, are you facing same problem with that also.

Also checkout below thread,
e2e.ti.com/.../1547744

0 Sarah Saeed over 10 years ago in reply to Arvind Singh

Prodigy 90 points

Hi Arvind,

The test returns bad page error after comparing what is read with what have already been written and finds them differ.

The read ( EVM6424_NAND_readPage() ) and write ( EVM6424_NAND_writePage() ) operations themselves do not return any error after sending check status command to the NAND (NAND_CMD( CMD_STATUS); ) implemented inside each read and write operation.

Please refer to the attached project in the previous post.

BR,

Sarah