remote debugging

[malar kavi]

Hi,
   There are some subroutines like
getDebugChar,putDebugChar,flash_i_cache,memset,
exceptionhandler used in i386-stub.c.How can i write
these subroutines and link with the program?After
linking how should i start the program in the target
machine?How should i establish serial communication
with the target machine?
       I will be really grateful if anybody is able
to get me out of these problems.
            Thanking u in advance.

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