Sorry for the typo: will be use a bad block -> will not use a bad block
On 9/25/20, Alan Carvalho de Assis <acas...@gmail.com> wrote: > Hi Thomas, > > According to drivers/mtd/README.txt the NAND support is only partial > because there is not a FS to handle it correctly. > > Normally for NAND you will need to scan the NAND to update the bad > block table during the boot (could be on NuttX or in a bootloader) to > guarantee the FS will be use a bad block (remember that NAND normally > comes with bad blocks from factory). Note that the nand_devscan() > function at mtd_nand.c just try to retrieve this information, it > doesn't update the Bad Block Table. > > Also your MCU needs to have some support in hardware to communicate > with NAND (parallel model), for SPI NAND it is not necessary. It > appears that currently only SAMA5 has support to it. > > Of course, this should be a very useful thing to have on NuttX because > as application become more complex we need more space for them. > > What MCU are you planing to use? > > BR, > > Alan > > On 9/25/20, Thomas Axelsson <thomas.axels...@actia.se> wrote: >> Hi, >> >> I'm trying to understand what level of NAND memory support currently >> exists >> in NuttX. The intention is to read and write files on the NAND memory. >> >> I have found CONFIG_MTD_NAND and there seems to be a NAND driver for the >> SAMA5 built-in NAND. All other MTD drivers appear to be for NOR? The >> intention is to use a Winbond W25N NAND memory, but I'm assuming the >> SAMA5 >> driver will be closer to what I need than the W25QxxxJV NOR driver (NAND >> vs >> NOR)? >> >> Regarding a file system, the NuttX About page mentions "NXFFS. The tiny >> NuttX wear-leveling FLASH file system." and there is also the option to >> enable littlefs. >> >> https://github.com/ARMmbed/littlefs/issues/11 indicates that one wants an >> FTL below littlefs. Going by the existence of CONFIG_FTL_READAHEAD and >> CONFIG_WRITEBUFFER, it seems that the FTL is integrated in MTD in NuttX? >> >> Is SMART File System (CONFIG_FS_SMARTFS) related to the "Really Tiny >> (SMART) Flash" (CONFIG_MTD_SMART) option? The latter says that it is only >> usable for really small memories. >> >> Thomas Axelsson >> SW Developer >> ACTIA Nordic AB (part of ACTIA Group) >> >> Mail: thomas.axels...@actia.se<mailto:thomas.axels...@actia.se> >> Web: www.actia.se<http://www.actia.se/> >> >> >
