FIgured it out. Issue #1995. On Mon, Aug 26, 2019 at 10:05 AM Fabien Lepoutre < fab...@culvertengineering.com> wrote:
> Thanks for your fast answer Fabio, > No the file sized are indeed in GB. Yes it is a lot of data :) > I had a look at the history but looks like it hasn't been changed since > 2015. Most of the focus has been on exFat since. > I could try out the exFat format to see if it's better. > I did my own version of the mmc driver so maybe that is the issue. I will > take a look at it. But as the addresses are calculated in the fatFS I would > have thought the issue would come from higher layer. > I'll keep you posted! > Fabien > > On Mon, Aug 26, 2019 at 9:58 AM Fabio Utzig <ut...@apache.org> wrote: > >> >> On Mon, Aug 26, 2019, at 1:39 PM, Fabien Lepoutre wrote: >> > Hi all, >> > I am running code with the FATFS driver to write a stream into an SD >> card. >> > The SD card is FAT32 formatted. >> > Everything goes well for some time but for some reason, after a while >> (I've >> > seen the issue come in at file size = 1.5GB, 2GB, 3GB etc...), the file >> >> Do you really mean GB here, or was it a typo? I never tried using big >> files like this, but don't mind trying myself! >> >> > memory location changes (looks like it wraps to the beginning of the SD >> > card memory) and overwrites the boot block and FAT structure which >> corrupts >> > the entire SD card. >> > I haven't found any similar issues but not sure anybody has tested the >> file >> > system to that extent. >> > Anyone has an idea on where to start to debug that issue? >> > I'm guessing this bug would be from the fatfs driver and not the >> mmc/sdcard >> > driver... am I wrong to think this? >> >> Possibly correct, the elm-chan FAT driver used is quite old now, and the >> maintainer has very good release notes describing fixes, etc; maybe >> something there can give a hint. Also those sizes are close to the limits >> that int32/uint32 can store, so it could be overflow, maybe even in the MMC >> driver... >> >> > Thanks, >> > Fabien >> > >> >
