#12183 LOW Not Tri: XO-4 B1 has Data Abort during boot

Zarro Boogs per Child bugtracker at laptop.org
Wed Oct 17 12:20:14 EDT 2012

#12183: XO-4 B1 has Data Abort during boot
           Reporter:  wad        |       Owner:  wad                  
               Type:  defect     |      Status:  new                  
           Priority:  low        |   Milestone:  Not Triaged          
          Component:  hardware   |     Version:  4-B1                 
         Resolution:             |    Keywords:  XO-4, OFW, Data Abort
        Next_action:  reproduce  |    Verified:  0                    
Deployment_affected:             |   Blockedby:                       
           Blocking:             |  

Comment(by wad):

 Five laptops (three w. 1.8V Flash, two w. 3.3V Flash) were tested for
 twenty-four hours.   All had increased Cin on power supplies.   Most had
 20 uF added to Vcore, and 10 uF added to +5V, +3.3V, +1.8V, and Vmem.
 One which continued running didn't have a cap on +3.3V.   On a scope the
 noise on Vcore dropped from 250 mV to 120 mV with these changes.

 One of the laptops w. 1.8V flash and one laptop w. 3.3V flash had a Data
 Abort.   More testing is needed to see if this is a statistically
 significant change.

Ticket URL: <http://dev.laptop.org/ticket/12183#comment:5>
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