AM335X: Algorithm for NAND ECC calculation

Johannes Reif

Hi,

I have to pre-program NAND-Flash devices for use with AM335x Sitara processor. So I have to calculate the ECC-Data for the initial data. The GPMC is configured to use BCH-8 ECC á 512 data bytes.

I know the ECC data scheme layout but not the algorithm used to calculate the ECC data.

Where can I get the algorithm? (preferably c-code)

over 10 years ago

0 Biser Gatchev-XID over 10 years ago

TI__Guru**** 393215 points

Hi Johannes,

I will notify the factory team about your request and they will contact you directly.

0 Wolfgang Muees1 over 10 years ago

Genius 3685 points

0 Johannes Reif over 10 years ago in reply to Wolfgang Muees1

Prodigy 40 points

Yes, that's what I thought too, but that does not seem to be the correct algorithm what the hardware is using. My sample OOB-data differs completely from the one computed with the linux algorithm.

I already Implemented the algorithm for an other TI device which used to differ from the linux implementation to the following:

ECC data at OOB-offset position = 12
BCH-8 ECC data length for 512 byte is 13 byte (no padding byte)
ECC-values are not XOR'ed to the ECC-values of a blank page

But that's also not used here...

0 Paul Gibson over 8 years ago in reply to Biser Gatchev-XID

Prodigy 55 points

Hi Biser Gatchev-XID, I also require the BCH-8 algorithm for factory pre-programming of the NAND. It is possible to send me this information please?

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AM335X: Algorithm for NAND ECC calculation