On Sunday 07 August 2022 14:00:27 Pali Rohár wrote: > Hello Scott! > > In past you disabled nand subpage write support for freescale eLBC and > IFC U-Boot nand drivers in following patch: > https://lore.kernel.org/u-boot/20121102234432.ga18...@buserror.net/ > > But in Linux kernel you disabled it only in freescale IFC nand driver: > https://lore.kernel.org/linux-mtd/20130410223437.ga26...@home.buserror.net/ > > letting kernel's freescale eLBC driver to have enabled subpage write > support. > > I would like to ask, has freescale eLBC nand controller support for > subpage writes? Or not and it should be disabled also in kernel? > > Or has somebody else these details?
Now I found following commit http://git.kernel.org/torvalds/c/f034d87def51 which seems to be fixing/emulating subpage write support. > The main issue is that U-Boot nand and UBI support for boards with eLBC > controllers is compatible with Linux kernel nand and UBI support because > these two drivers calculate UBI geometry differently. UBI header offset > is calculated from nand subpage size and nand subpage size obviously > depends on the fact if subpage write is supported or not. > > I would like to fix this issue, but I do not know if wrong information > is in U-Boot driver or in Linux kernel driver.