#10603 HIGH Not Tri: Crash very early in kernel boot on XO-1.75 A2

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#10603: Crash very early in kernel boot on XO-1.75 A2
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 Reporter:  wad      |                 Owner:  buytenh    
     Type:  defect   |                Status:  new        
 Priority:  high     |             Milestone:  Not Triaged
Component:  kernel   |               Version:  1.75-A1    
 Keywords:  XO-1.75  |           Next_action:  diagnose   
 Verified:  0        |   Deployment_affected:             
Blockedby:           |              Blocking:             
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 When trying to boot XO-1.75 A2 prototypes, running OFW Q4A10F and OS3,
 many boards have a tendency to halt very early in the kernel boot process
 (before the serial port is setup).

 The user visible symptom is an XO icon with a single dot underneath.

 Occasionally, we see some lines on the screen before the crash (but again,
 nothing on the serial port.)

 cjb provided a patch to output serial information.  A capture of a crash
 is attached.

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Ticket URL: <http://dev.laptop.org/ticket/10603>
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