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remote serial protocol - gdbserver


Hi,
I have a querry related to remote serial protocl.

I have been ported gdbserver on RTOS (micro itron) running on SH3
processor.
while debugging the remote application with "next" user command from gdb,

Gdb send the following packets to gdbserver

         m0,2#fb
         M0,2:20c3#0d
  
         simmilary for Z packet with zero address.

Here if the address is zero, what does it mean ? for example in this
packet "M0,2:20c3#0d" where the TRAP instruction should be write ?
where the data should be read from or write into ?

The solution for this querry will be greatly appreciated.

- Regards
Raja s


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