Hello! On Sunday 07 August 2022 16:13:00 Pali Rohár wrote: > 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.
If there is not any objections I would send patch to U-boot eLBC nand controller driver which would remove that NAND_NO_SUBPAGE_WRITE too. As those subpage write functions are present also in U-Boot driver. Any comments? > > 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.
