Signed-off-by: Jörg Krause joerg.krause@embedded.rocks --- drivers/mtd/nand/mxs_nand.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/drivers/mtd/nand/mxs_nand.c b/drivers/mtd/nand/mxs_nand.c index 912fed8..76e47ab 100644 --- a/drivers/mtd/nand/mxs_nand.c +++ b/drivers/mtd/nand/mxs_nand.c @@ -148,6 +148,13 @@ static inline uint32_t mxs_nand_get_ecc_strength(uint32_t page_data_size, { int ecc_strength;
+ /* Determine the ECC layout with the formula: + * ECC bits per chunk = (total page spare data bits) / + * (bits per ECC level) / (chunks per page) + * where: + * total page spare data bits = + * (page oob size - meta data size) * (bits per byte) + */ ecc_strength = ((page_oob_size - MXS_NAND_METADATA_SIZE) * 8) / (MXS_NAND_BITS_PER_ECC_LEVEL * mxs_nand_ecc_chunk_cnt(page_data_size));