In the past I have put the FAT in a SPI Fram and the clusters went to a SPI nor flash.
On Wed, Jan 19, 2022, 17:13 Barbiani <barbi...@gmail.com> wrote: > Ever heard of this? > > https://github.com/joembedded/JesFs > > > On Wed, Jan 19, 2022, 16:44 Alan Carvalho de Assis <acas...@gmail.com> > wrote: > >> Some time ago TizenRT (a NuttX fork) added Journalling support to SmartFS. >> >> We couldn't get it from them in the past because they changed the >> License to Apache, but now that NuttX is Apache license maybe it is >> possible to bring it to NuttX: >> >> https://github.com/sunghan-chang/TizenRT/tree/master/os/fs/smartfs >> >> They added an Apache header over the BSD license header, it could make >> things messy to bring it NuttX mainline, but it could be worth to try. >> >> BR, >> >> Alan >> >> On 1/19/22, Alexander Lunev <alexanderlu...@mail.ru.invalid> wrote: >> > FAT itself definitely is not suitable for your task. >> > You need a journaling (log-structured) file system. >> > Alternatively, FAT can be used as a container file system for the >> > target journaling file system you like. E.g. you can format your Flash >> > by FAT, then pre-write a dummy solid file to the FAT occupying the full >> > space, and use this solid file for placing your journaling file system >> > as the content of the solid file (open, lseek, read, write, close). >> > >> > Best regards, >> > Alexander Lunev. >> > >> > On Wed, 2022-01-19 at 18:40 +0000, TimH wrote: >> >> FAT seems broken for NOR flash devices. Spent days getting nowhere. >> >> >> >> Since FAT and flash devices don't really play well together anyway >> >> (already found s512 erases a flash sector at least 4 times when >> >> writing >> >> a cluster), so I'm wondering, in parallel, if NuttX has other tricks >> >> up >> >> its sleeve that might achieve the same end? I want t: >> >> >> >> - write to the flash, for logging, from the app running on the >> >> board. >> >> This can be done with any FS - or raw - as far as I'm concerned. Not >> >> the >> >> issue. >> >> >> >> - an external PC (ideally Linux, Windows and MAC) needs to be able >> >> "see" >> >> the data via USB (msd) and read/write to the memory (log data, >> >> config >> >> files, audio files, etc). Hence FAT. >> >> >> >> With a flash size of between 32 and 128Mbyte, I don't think a >> >> ramdisk >> >> formatted as FAT holding a copy of the flash data is really the way >> >> to >> >> go (board only has 64Mbyte RAM anyway). >> >> >> >> I'm guessing I'll have to keep up the battle - that NuttX is winning >> >> - >> >> of FAT vs. NOR flash until the bitter end, but if anyone does have >> >> other >> >> ideas I'm listening! >> > >> > >> >
