Hi Paul, > Am 09.10.2021 um 20:49 schrieb Paul Cercueil <paul@xxxxxxxxxxxxxxx>: > > Hi, > > Looks like NAND support has been broken on the JZ4740 SoC for a while; Yes, I remember someone telling that something was fundamentally broken and impossible to be fixed a while ago. > 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. would this also work for jz4780 NAND? BR, Nikolaus
