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

Zarro Boogs per Child bugtracker at laptop.org
Tue Jul 26 14:50:56 EDT 2011

#11085: XO-1.75 Memory errors
           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:                       |  

Comment(by wad):

 Given the memory chip being used (K4B1G0846G-BCH9), it specs a CAS latency
 of 9 cycles of 1.5 nS (1333 MHz operation).  We actually use a 2.5 nS
 cycle time, which implies that we should be using a CAS latency of 6
 cycles.  As this was reduced to 4 in the latest memory configuration, this
 might be our problem.

Ticket URL: <http://dev.laptop.org/ticket/11085#comment:5>
One Laptop Per Child <http://laptop.org/>
OLPC bug tracking system

More information about the Bugs mailing list