From: Álvaro Fernández Rojas noltari@gmail.com
Hamming ECC doesn't cover the OOB data, so reading or writing OOB shall always be done without ECC enabled. This is a problem when adding JFFS2 cleanmarkers to erased blocks. If JFFS2 clenmarkers are added to the OOB with ECC enabled, OOB bytes will be changed from ff ff ff to 00 00 00, reporting incorrect ECC errors.
Fixes: 27c5b17cd1b1 ("mtd: nand: add NAND driver "library" for Broadcom STB NAND controller") Signed-off-by: Álvaro Fernández Rojas noltari@gmail.com Acked-by: Brian Norris computersforpeace@gmail.com Signed-off-by: Miquel Raynal miquel.raynal@bootlin.com Link: https://lore.kernel.org/linux-mtd/20210224080210.23686-1-noltari@gmail.com [Ported to U-Boot from the Linux kernel] Signed-off-by: Linus Walleij linus.walleij@linaro.org --- drivers/mtd/nand/raw/brcmnand/brcmnand.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/mtd/nand/raw/brcmnand/brcmnand.c b/drivers/mtd/nand/raw/brcmnand/brcmnand.c index 2cca897ab3c9..ee3ff372b863 100644 --- a/drivers/mtd/nand/raw/brcmnand/brcmnand.c +++ b/drivers/mtd/nand/raw/brcmnand/brcmnand.c @@ -2567,6 +2567,12 @@ static int brcmnand_init_cs(struct brcmnand_host *host, ofnode dn) ret = nand_register(0, mtd); #endif /* __UBOOT__ */
+ /* If OOB is written with ECC enabled it will cause ECC errors */ + if (is_hamming_ecc(host->ctrl, &host->hwcfg)) { + chip->ecc.write_oob = brcmnand_write_oob_raw; + chip->ecc.read_oob = brcmnand_read_oob_raw; + } + return ret; }