#11085 BLOC 1.5-har: XO-1.75 Memory errors

[Zarro Boogs per Child]

#11085: XO-1.75 Memory errors
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           Reporter:  wad                  |       Owner:  wad            
               Type:  defect               |      Status:  assigned       
           Priority:  blocker              |   Milestone:  1.5-hardware-C 
          Component:  ofw - open firmware  |     Version:  1.75-B1        
         Resolution:                       |    Keywords:  XO-1.75, memory
        Next_action:  reproduce            |    Verified:  0              
Deployment_affected:                       |   Blockedby:                 
           Blocking:                       |  
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Comment(by wad):

 Q4B05g and Q4b05ra (same without PHY Sync) were failures, in that one or
 two laptops showed enough memory errors that they refused to boot with
 them.

 Both had Auto Manual DLL Update enabled.  Q4B05rc has the same timing as
 q4b05ra, but has Auto Manual DLL Enable (and PHY Sync) disabled.

 Testing of dilinger's kernel w. http://dev.laptop.org/~dilinger/0001-OLPC-
 force-ddr3-recalibration-every-second.patch along with q4b07mb on 24
 laptops (6 at 50C) over two days resulted in one laptop failing w. a data
 abort, and one having the test stopped by the out-of-memory problem.

-- 
Ticket URL: <http://dev.laptop.org/ticket/11085#comment:11>
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