Hi, Looks like NAND support has been broken on the JZ4740 SoC for a while; it looks like it comes from the fact that the "hw_oob_first" mechanism was dropped from the NAND core and moved to the Davinci driver. It turns out the JZ4740 SoC needs it too; I didn't notice it when writing the new ingenic-nand driver (to replace the old jz4740-nand driver) most likely because my Device Tree had the "nand-ecc-mode" set to "hw_oob_first". I am not very sure about patch [1/3]; to me the original code does not make sense, and it didn't work out-of-the-box on the JZ4740 without it. By applying patch [1/3] the function nand_read_page_hwecc_oob_first() can be reused for the JZ4740 SoC as well. But I did not test patch [1/3] on Davinci. Cheers, -Paul Paul Cercueil (3): mtd: rawnand/davinci: Don't calculate ECC when reading page mtd: rawnand: Export nand_read_page_hwecc_oob_first() mtd: rawnand/ingenic: JZ4740 needs 'oob_first' read page function drivers/mtd/nand/raw/davinci_nand.c | 73 +------------------ .../mtd/nand/raw/ingenic/ingenic_nand_drv.c | 5 ++ drivers/mtd/nand/raw/nand_base.c | 69 ++++++++++++++++++ include/linux/mtd/rawnand.h | 2 + 4 files changed, 77 insertions(+), 72 deletions(-) -- 2.33.0
