Openmoko Bug #2135: write kernel crash message somewhere where it can be retrieved after reboot?

[Openmoko Public Trac]

#2135: write kernel crash message somewhere where it can be retrieved after
reboot?
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 Reporter:  lindi            |          Owner:  openmoko-kernel
     Type:  enhancement      |         Status:  new            
 Priority:  normal           |      Milestone:                 
Component:  System Software  |        Version:  unspecified    
 Severity:  normal           |       Keywords:                 
 Haspatch:  0                |      Blockedby:                 
Estimated:                   |    Patchreview:                 
 Blocking:                   |   Reproducible:                 
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Comment(by werner):

 I would use RAM. It's easy to access and it's very likely to survive a
 reset. Also, since the kernel itself may not know it is dead (e.g., if
 the system just hangs and you have to reset it), you would want to write
 all messages to that "safe" location, so access should be inexpensive.

 For retrieval, you could either extend the boot loader, or, better, only
 start writing to the "safe area" after you've checked for the presence
 of old content. That way, crashes occurring before the retrieval could
 not be recorded (if you use multiple buffers you rotate, you could even
 handle some cases, but it may not be worth the effort), but you're
 probably after those that are hard to reproduce and only happen after a
 while.

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Ticket URL: <https://docs.openmoko.org/trac/ticket/2135#comment:1>
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