"Andreas Fritiofson"  napisaƂ(a): 
 > The "clearing lockup after double fault" says that the core was in a
 > lockup state which means a fault occurred (bad memory access, invalid
 > instruction and such, probably due to a software bug) and, in
 > addition, there was an error while fetching or executing the exception
 > vector (no fault handler installed?). Common bugs that can cause this
 > is invalid pointer dereferencing, buffer overflows or enabled
 > interrupts for which no handler is installed.

Actually there is another (IMO more common) cause: no (valid) code in the 
device. After erasing, running the blank chip results in double lockup too.

4\/3!!
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