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));
--
2.3.5
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