Hi Bjørn, On 7/18/23, Bjørn Forsman <bjorn.forsman@xxxxxxxxx> wrote: > On Tue, 18 Jul 2023 at 08:03, Kai Tomerius <kai@xxxxxxxxxxx> wrote: >> I should have mentioned that I'll have a large NAND flash, so ext4 >> might still be the file system of choice. The other ones you mentioned >> are interesting to consider, but seem to be more fitting for a smaller >> NOR flash. > > If you mean raw NAND flash I would think UBIFS is still the way to go? > (It's been several years since I was into embedded Linux systems.) > > https://elinux.org/images/0/02/Filesystem_Considerations_for_Embedded_Devices.pdf > is focused on eMMC/SD Cards, which have built-in controllers that > enable them to present a block device interface, which is very unlike > what raw NAND devices have. > > Please see https://www.kernel.org/doc/html/latest/filesystems/ubifs.html > for more info. > You are right, for NAND there is an old (but gold) presentation here: https://elinux.org/images/7/7e/ELC2009-FlashFS-Toshiba.pdf UBIFS and YAFFS2 are the way to go. But please note that YAFFS2 needs license payment for commercial application (something that I only discovered recently when Xiaomi integrated it into NuttX mainline, bad surprise). BR, Alan
