Question about NFCv2 BCH Algorithm.

[jclab-joseph]

I would like to know about the implementation of BCH ECC algorithm in NFCv2.

The m=15,t=16 parameter in the general BCH algorithm does not generate the same value as the ECC created by armada.
I want to simulate armada nand on PC.

https://github.com/MarvellEmbeddedProcessors/u-boot-marvell/tree/u-boot-2013.01-15t1/tools/marvell/BCH/Linux/EccTool

I found the link above, but this is the same as the default BCH algorithm, which produces a different value than armada's ECC.

NFCv2 Layout:

  ------------------------------------------------------------------------------
  | 2048B data | 32B spare | 30B ECC || 2048B data | 32B spare | 30B ECC | ... |
  ------------------------------------------------------------------------------

Ref: https://lwn.net/Articles/571062/

Sample Data:

00000000  55 42 49 23 01 00 00 00  00 00 00 00 00 00 00 01  |UBI#............|
00000010  00 00 08 00 00 00 10 00  00 00 00 00 00 00 00 00  |................|
00000020  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000030  00 00 00 00 00 00 00 00  00 00 00 00 7f 58 53 19  |.............XS.|
00000040  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
00000800  ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff  |................|
*
00000820  3a 49 59 22 43 64 b8 35  8e 8d af f4 d4 02 7e d1  |:IY"Cd.5......~.|
00000830  74 0b a3 ec aa 31 0c 8b  0a 2f 1b 1b 4b c8 ff ff  |t....1.../..K...|