Hi Xiang and Alan, Thanks for the info Xiang.
Alan, the first error returns ENOTTY as littlefs sends a BIOC_FLUSH command in IOCTL which isn't supported in NAND, and Xiang has provided the explanation on why that is fine. As for the -ENOSPC, I'm looking into it currently. It *should *have enough space, considering I have the virtual device with a size of 2MB + (some bytes for the respective spare areas in blocks) and that is way more than theoretical requirement of littlefs, so I'll need to debug it further. PS: I was also having a problem with the "vi" utility in the sim, any movement keys (or anything I typed in general) that I typed were echoed out the the terminal as well, so I fixed that using termios to disable echo (and enable back on quitting vi). BR, SP On Sat, 24 Feb, 2024, 20:18 Alan C. Assis, <acas...@gmail.com> wrote: > Hi Saurav, > > I suggest you to verifyr these errors first: > > *Command: 1293 | BIOC_FLUSH: 1293* > Error Upper! ioctl | -25 > > #define ENOTTY 25 /* Not a typewriter */ > > So, you can search where this ENOTTY is returned. > > Some to: > > nx_mount: ERROR: Bind method failed: -28 > nsh: mount: mount failed: 28 > > #define ENOSPC 28 /* No space left on device */ > > BR, > > Alan > > On Sat, Feb 24, 2024 at 9:28 AM Saurav Pal <resyfer....@gmail.com> wrote: > > > Hi all, > > > > I've been trying to develop a device simulator for the NAND flash (in the > > sim). > > > > A short note on what this does is create a virtual NAND flash (from RAM) > > and provide a driver, as well as a wrapper around the upper half (which > for > > now, does nothing extra). This helps in creating records of > > reads/writes/erases (in a separate file) for testing and statistics > > purposes. > > > > Since littlefs is one of the supported filesystems on MTD devices, I > tried > > to use it to test mount but it tries to use an ioctl with BIOC_FLUSH in > the > > format process, which is not supported as far as code in > > drivers/mtd/mtd_nand.c go. > > > > *Should that be something that the NAND driver should support?* > > > > Here are the logs of that process, the first ioctl is for MTDIOC_GEOMETRY > > (which is supported), and second for BIOC_FLUSH (in *bold*): > > > > nuttx ➤ make && ./nuttx > > LD: nuttx > > login: admin > > password: > > User Logged-in! > > nsh> ls /dev > > /dev: > > console > > gpio0 > > gpio1 > > gpio2 > > gpio3 > > loop > > null > > oneshot > > ram0 > > ram1 > > ram2 > > zero > > nsh> mtddev > > Size: 2097152 B > > > > Pages: 4096 > > Blocks: 33 > > Writing...Done > > Driver running > > nsh> ls /dev > > /dev: > > console > > gpio0 > > gpio1 > > gpio2 > > gpio3 > > loop > > mtd > > null > > oneshot > > ram0 > > ram1 > > ram2 > > zero > > nsh> mount -t littlefs -o forceformat /dev/mtd /hi > > Upper! ioctl > > Command: 1537 | BIOC_FLUSH: 1293 > > Upper! bread > > Page 128 > > Lower! rawread : Page 128 > > Lower! rawread : Page 129 > > Lower! rawread : Page 130 > > Lower! rawread : Page 131 > > Upper! erase > > Lower! eraseblock : Block 0 > > Upper! bread > > Page 0 > > Lower! rawread : Page 0 > > Lower! rawread : Page 1 > > Lower! rawread : Page 2 > > Lower! rawread : Page 3 > > Upper! bread > > Page 4 > > Lower! rawread : Page 4 > > Lower! rawread : Page 5 > > Lower! rawread : Page 6 > > Lower! rawread : Page 7 > > Upper! bwrite > > Lower! rawwrite : Page 0 > > Lower! rawwrite : Page 1 > > Lower! rawwrite : Page 2 > > Lower! rawwrite : Page 3 > > Upper! ioctl > > *Command: 1293 | BIOC_FLUSH: 1293* > > Error Upper! ioctl | -25 > > Upper! bread > > Page 0 > > Lower! rawread : Page 0 > > Lower! rawread : Page 1 > > Lower! rawread : Page 2 > > Lower! rawread : Page 3 > > nx_mount: ERROR: Bind method failed: -28 > > nsh: mount: mount failed: 28 > > nsh> > > > > The logs with "Upper!" refer to the upper half of the driver being > > executed, and same for the lower, and the pages are numbered from the > start > > of the device (ie. (block << LOG_N_BLOCKS_PER_PAGE) + page_in_block)). > > > > Regards, > > SP > > >
