On Thu Sep 26 20:31:17 2013 green <greenfreedom10@xxxxxxxxx> wrote: > Pali Rohár wrote at 2013-09-26 10:44 -0500: > > On Thu Sep 26 17:18:32 2013 green <greenfreedom10@xxxxxxxxx> wrote: > > > joerg Reisenweber wrote at 2013-09-13 06:45 -0500: > > > > Electrical properties of MMC interfaces are not all the same. A > > > > card that seems to work in one reader may fail in another. > > > > And a card that once worked fine may start to act up when the > > > > card's electrical properties change due to aging. > > > > The N900 also might age, try a new card of roughly same type in > > > > N900 and see what results you get. > > > > > > I went back to an older RiData 16GB card, and it is working fine for > > > now. However, I experience filesystem corruption multiple times with > > > that card in the N810. Also, the SanDisk 32GB works fine in *other* > > > readers. Apparently, SD cards are inherently unreliable. > > > > Because opening back cover on n900 automatically disconnect sd card > > slot (which means that kernel cannot flush buffers back to card), > > filesystem on sd card is always corrupted. > > 1. Are you sure it does not initiate a filesystem umount? > Yes, already looked into kernel code and tried to at least auto remount readonly. But I was not able to patch kernel to do that. Umount is called *after* cover is opened (by ke-recv). > 2. I do not open the cover until the unit is *off* anyway. > But clean umount is still needed. > 3. An ext3/4 filesystem (with a journal!) is not "corrupted" when not > cleanly unmounted. > Yes, reason why I'am using ext4. But lot of people have Fat32. > 4. I have disabled automatic mounting of the SD card via > `/etc/default/osso-mmc-blacklist.sh` and run fsck before each mount > (with a custom script). Calling fsck before every mount is also already implemented in cssu-devel. This is reason why we need it. -- Pali Rohár pali.rohar@xxxxxxxxx _______________________________________________ maemo-users mailing list maemo-users@xxxxxxxxx https://lists.maemo.org/mailman/listinfo/maemo-users
