#9100 BLOC 10.1.2: 2.6.27+ early boot crashes on XO1

[Zarro Boogs per Child]

#9100: 2.6.27+ early boot crashes on XO1
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           Reporter:  dsd                  |       Owner:  wmb at firmworks.com                  
               Type:  defect               |      Status:  assigned                           
           Priority:  blocker              |   Milestone:  10.1.2                             
          Component:  ofw - open firmware  |     Version:  1.5 Software Build os206 aka 10.1.1
         Resolution:                       |    Keywords:                                     
        Next_action:  add to release       |    Verified:  0                                  
Deployment_affected:                       |   Blockedby:                                     
           Blocking:                       |  
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Comment(by dsd):

 Data point for future reference:

 Mitch's "poor-man's serial character output routine" (above) was the
 method we used to debug this, and it was easy once we had a serial console
 combined with a laptop that reproduces the problem (thanks Hal).

 And a tip that would have saved us a few rounds of back-and-forth: next
 time this happens, modify panic() to send the message through the serial
 routine, since in this case we were encountering a panic that would have
 clarified things substantially:

 Overlapping early reservations 800-fffff BIOS reserved to 0-fff BIOS data
 page

 (thanks to Quozl for the idea)

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Ticket URL: <http://dev.laptop.org/ticket/9100#comment:56>
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