Hi Saurav, Amazing! I'm happy to know you fixed it!
If you can create some board configuration or document how you are doing it, I think it will be useful for more people here! Some years ago Ken Petit created a small Flash Simulator to use with SmartFS, but I think this one you are using is different. Best Regards, Alan On Sat, Feb 24, 2024 at 4:22 PM Saurav Pal <resyfer....@gmail.com> wrote: > Hi Alan, > > I have figured out the cause...it was because of a very *small* error in my > rawwrite method which was confusing littlefs (which I think commits CRC, > flushes it and rechecks the written data for consistency at one point in > the forceformat operation). > > Right now, mount() works as intended. However there is a floating point > exception that occurs if I try to cd or ls the mounted directory, and I'll > be looking into it tomorrow (most probably a division by 0 error). > > Here are the logs and stats just after a mount: > https://pastebin.com/QxJ4qMRd (it's a bit long....has stats about each of > 4096 pages in a 2MB virtual device). > > PS: I had to use vi to view the logs in nsh in a sane manner, though a tool > like less would be godsend in such cases. > > BR, > SP > > On Sat, Feb 24, 2024 at 9:23 PM Saurav Pal <resyfer....@gmail.com> wrote: > > > 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 > >> > > >> > > >
