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

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#12183: XO-4 B1 has Data Abort during boot
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           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:  test in build  |    Verified:  0                    
Deployment_affected:                 |   Blockedby:                       
           Blocking:                 |  
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Comment(by wad):

 At this point, I've duplicated this success (12K cycles) on six laptops.
 There have been no re-occurences of this issue, with one exception:
 SHC23800085, an unmodified SKU293 B1 laptop, definitely testing using
 Q7B07ja, has thrown a Data Abort on reboot twice now, with a frequency
 roughly that seen before (1 per 2K reboots ?).

 ftrace, .registers, and keyboard driver info from one of the Data Aborts
 is attached.   The screen simply said

  Data Abort

  ok

 The keyboard was inoperative, as before.   The ftrace is identical, but
 the registers and keyboard queue state aren't.

 Now that it has been duplicated on this hardware w. q7b07, I will add the
 decoupling present on C1 and retest.

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Ticket URL: <http://dev.laptop.org/ticket/12183#comment:13>
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