How to debug via serial cable(port) ?

[@@]

Hi,
  I want to debug a AP via serial cable(port).
  And I read the GDB HOWTO that describes a remote debugging method.
  But I don't understand that very well.
  Does  anyone ever use this method to debug?
  Could anyone kindly guide me in a simple way to do this?
  Any help is appreciated. 
 
Best Regards,
             Joseph 


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