#10314 HIGH Not Tri: XO-1.5 won't boot

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#10314: XO-1.5 won't boot
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           Reporter:  wad       |       Owner:  wad        
               Type:  defect    |      Status:  assigned   
           Priority:  high      |   Milestone:  Not Triaged
          Component:  hardware  |     Version:  1.5-C2     
         Resolution:            |    Keywords:  XO-1.5 boot
        Next_action:  diagnose  |    Verified:  0          
Deployment_affected:            |   Blockedby:             
           Blocking:            |  
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Comment(by wmb at firmworks.com):

 I made a rough estimate of where the code might be by counting LFRAME
 assertions. (actually I used calipers; I didn't really count them all).
 There appear to be about 260 LFRAMEs in the CPU group.  If my analysis is
 correct, that puts the death point right in the middle of a sequence of
 "write MSR" instructions that are clearing Memory Type Range Registers.  I
 don't see anything particularly interesting about that area of the code.
 I can't think of why that particular sequence would be prone to failure.

 Perhaps my analysis is flawed.  It will be interesting to see the fetch
 addresses on the LPC bus.

-- 
Ticket URL: <http://dev.laptop.org/ticket/10314#comment:11>
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