#9415 BLOC Not Tri: SD write errors from Linux on XO 1.5

[Zarro Boogs per Child]

#9415: SD write errors from Linux on XO 1.5
--------------------------+-------------------------------------------------
 Reporter:  wad           |                 Owner:  dsaxena    
     Type:  defect        |                Status:  new        
 Priority:  blocker       |             Milestone:  Not Triaged
Component:  not assigned  |               Version:  1.5-A2     
 Keywords:  XO-1.5 SD     |           Next_action:  diagnose   
 Verified:  0             |   Deployment_affected:             
Blockedby:                |              Blocking:             
--------------------------+-------------------------------------------------
 On an XO-1.5 A2 prototype (#14), running Linux kernel
 2.6.30_xo1.5-20090717.0115.1.olpc.ba8f22b and firmware Q2E05, I
 encountered write errors when transferring large files to the SD card.

 I was running the NAND test script (described at:
 http://wiki.laptop.org/go/NAND_Testing ) and obtained four errors over
 several thousand cycles of testing (where each cycle is 94 MB of reading
 and 20 MB of writing).

 The errors were not, however, bit errors.  Examination of the two test
 files for one of the errors (one file is generated randomly, then copied
 to make the second) shows that a large region (around a megabyte) is
 wrong.

 The attached dmesg and /var/log/messages logs show identical information
 about an error encountered by the kernel at the time of the error.

-- 
Ticket URL: <http://dev.laptop.org/ticket/9415>
One Laptop Per Child <http://laptop.org/>
OLPC bug tracking system