Misguiding of page layout in gpmi-nand driver comments

[csoapy]

See: https://elixir.bootlin.com/linux/v5.0.2/source/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c

I think there shouldn't be an E but E', and a line should be added to explain about E' 

I'm right?

[gusarambula]

Hello 计龙 杨,

I confirmed and according to the reference manual, the BCH encode process creates t * 13/14 parity symbols for each data block that are written on the flash device after the corresponding data block. Since t is the number of correctable bits (ecc strength) and you can only select Galois Field of length 13 or 14, this means that the length of the appended data is E * G and not just E. Therefore, the used formula is correct, the diagram is not.

Thanks for pointing this out!

Regards,