On Fri 13 September 2013 05:16:36 green wrote: > Nokia N900 with SanDisk 32GB class 10 micro SD card. > > I have been using this micro SD card with kernel-power v50 for several > months. Suddenly the N900 reset one day, during or after a phone call > I think. I thought that was strange, but then noticed that, starting > then, *every* time I tried running unison (triggers lots of IO on SD > card), the N900 would reset. There was also some strange filesystem > behavior with the Debian chroot on the SD card. dmesg contains > messages like these (some line breaks added): > > mmcblk1: error -110 sending read/write command, \ > response 0x0, card status 0x400b00 > mmcblk1: error -110 transferring data, sector 15210519, \ > nr 1, card status 0x400b00 > end_request: I/O error, dev mmcblk1, sector 15210519 > > (For some reason, it was sometimes 'mmcblk0' instead of 'mmcblk1', but > either way the messages happened only when there is external SD card > IO.) mmc0 when you booted with uSD in, mmc1 when you inserted it after booting > e2fsck (using N900 as reader) returns errors like this (line breaks > added again): > > Error reading block 1376258 (Attempt to read block from filesystem \ > resulted in short read) while getting next inode from scan. Ignore \ > error<y>? > > But everything works great with a SD card reader on a regular Linux > system. > > So I tried upgrading to kernel-power v52, tried the stock kernel, and > tried reflashing to stock everything. Same errors. > > It seems like from > <http://maemo.org/community/maemo-users/n900_microsd_card_i-o_errors_and_co > rruption/> and > <http://www.gossamer-threads.com/lists/maemo/users/65584#65591> that this > error happens with the higher speed class SD cards, but has been worked > around starting with v49 of kernel-power. Does anyone have any idea why I > suddenly began to experience these IO errors? 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. /j -- () ascii ribbon campaign - against html e-mail /\ www.asciiribbon.org - against proprietary attachments (alas the above page got scrapped due to resignation(!!), so here some supplementary links:) http://www.georgedillon.com/web/html_email_is_evil.shtml http://www.nonhtmlmail.org/campaign.html http://www.georgedillon.com/web/html_email_is_evil_still.shtml http://www.gerstbach.at/2004/ascii/ (German)
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