config.help

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CONFIG_MTD_NAND
  This enables support for accessing all type of NAND flash
  devices.

CONFIG_MTD_NAND_ECC
  This enables software-based ECC for use with NAND flash chips. It
  can detect and correct 1 bit errors per 256 byte blocks. This
  should be used to increase the reliability of the data stored and
  read on the device.

CONFIG_MTD_NAND_VERIFY_WRITE
  This adds an extra check when data is written to the flash. The
  NAND flash device internally checks only bits transitioning
  from 1 to 0. There is a rare possibility that even though the
  device thinks the write was successful, a bit could have been
  flipped accidentaly due to device wear, gamma rays, whatever.
  Enable this if you are really paranoid.

CONFIG_MTD_NAND_SPIA
  If you had to ask, you don't have one. Say 'N'.