> -----Oorspronkelijk bericht----- > Van: Detlev Zundel [mailto:d...@denx.de] > Verzonden: vrijdag 17 januari 2014 15:59 > Aan: Ruud Commandeur > CC: U-Boot list > Onderwerp: Re: [U-Boot] Fat write problem > > Hi Ruud, > > > This week I decided to do some further research and testing > regarding > > this problem. > > With the image I had from the previous time, I could immediately > > reproduce it and > > by adding more and more debug prints, I tried to find the > cause. Sofar, > > I have not > > succeeded in this yet. > > > > However: later on I started testing with a freshly > formatted drive (32 > > MB FAT partition) > > and kept repeating the fatwrite command: > > > > fatwrite mmc 0:1 42000000 test-x 200 > > > > where x runs from 1, 2,3 and further. And this way I could > reproduce it > > quite easily. > > Writing always fails for the 32nd file. This is with the partition > > formatted with a 512 byte > > sector size and a cluster size of 4. If the cluster size is > 1 (formatted > > by Windows), > > it already fails at the 8th file. > > > > If I create a subdirectory (from Linux) with already 24 > files in it, I > > can still write 29 files > > and it fails at number 30. Also, if earlier files were > deleted from the > > root-directory, they > > still count in the total number of files here. > > > > If I take out the card where u-boot fails to write new files, I can > > still add new files from > > my PC with Linux or Windows. > > > > I tested with both long and short filenames (same result), VFAT is > > enabled. > > > > I hope this gives you all some more information about this > problem and > > perhaps it is even a > > known problem (limited number of files in the root > directory?). I know > > it is voor FAT16, but > > that was 512 entries if I am correct. > > Thanks for the extensive research into this problem. For people to > help, I think the barrier of reproducing the problem is "somewhat > high", so it occurred to me if you can help setup a very easy test for > people to work on. Would you be able to generate a small > image that one > can dd to a mmc card and then immediately provoke the error? If you > don't have any hosting space, as a last resort I'd be fine for you to > put it on our wiki [1]. > Hi Detlev,
Thanks for your response. Finally I get some ;-) I can look for creating some image, but I don't think it is that hard to reproduce (now I think to know what causes it). Either use 32 times the fatwrite command (using the cmd history and increment the x-nr each time) or just copy up to 31 files to the root of the FAT partition by using the host machine and place the SD-card back on the targe device running u-boot. Hope this makes it easy enough, otherwise I will be glad to hear from you. N.B. All this was with a FAT16 partition. If I use FAT32, I have no such problem! At least not for 45 files up till now... Regards, Ruud > Cheers > Detlev > > [1] http://www.denx.de/wiki/view/U-Boot/TooBigPatches > > -- > Golden rule #12: When the comments do not match the code, > they probably are > both wrong. -- Steven Rostedt > <1300126962.9910.128.ca...@gandalf.stny.rr.com> > -- > DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel > HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany > Phone: (+49)-8142-66989-40 Fax: (+49)-8142-66989-80 Email: d...@denx.de > _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot