#10991 NORM 1.75-fi: XO-1.75 A3 boot panic, no filesystem could mount root, tried: ext3 ext2 ext4 cramfs vfat msdos

[Zarro Boogs per Child]

#10991: XO-1.75 A3 boot panic, no filesystem could mount root, tried: ext3 ext2
ext4 cramfs vfat msdos
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           Reporter:  martin.langhoff  |       Owner:  Quozl        
               Type:  defect           |      Status:  assigned     
           Priority:  normal           |   Milestone:  1.75-firmware
          Component:  hardware         |     Version:  1.75-A3      
         Resolution:                   |    Keywords:               
        Next_action:  never set        |    Verified:  0            
Deployment_affected:                   |   Blockedby:               
           Blocking:                   |  
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Comment(by martin.langhoff):

 The kernel from os4 was v2.6.36-139-ge7978440, built on cjb's cross-build
 host. I have just recompiled it on my cross-build host ('martin-tp') and
 it boots correctly on unit 44.

 This removes the build host as a variable - this recent kernel, built on
 martin-tp, won't boot on units with this issue:
 http://dev.laptop.org/~martin/xo1.75kernels/kernel-2.6.39_xo1.75-20110616.1726.olpc.cce4f0d.armv7l.rpm

 So the problem is likely to be triggered by something in the delta between
 2.6.36-139-ge7978440 and v2.6.39-97-gcce4f0d . Several things make
 bisection hard and (probably) useless.

 We need to trace or instrument the boot process somehow.

-- 
Ticket URL: <http://dev.laptop.org/ticket/10991#comment:19>
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