GDB tutorial for students - http://www.cs.cmu.edu/~gilpin/tutorial

1. Get gdbserver from ipkg-unbuild [openslug pkgs]gdb-6.3*ipk,put into nslu2/usr/bin
2. On your host PC, compile GDB from the source using the following options:
   
   ./configure --target=armeb-linux --host=i686-linux

make install
   
   This should install armeb-linux-gdb which is GDB targeted for a big endian ARM architecture.cross_gdb. If the configure command complains that it cannot find -lcurses then install the development package for ncurses; on Debian the package name is libncurses5-dev.
3. On your host PC, install 'lesstif' and 'ddd' to get a GDB GUI.
4. On the NSLU2, start the GDB server
   
   gdbserver YourHostPCsIP:5000 test_nslu
5. On your PC, start DDD.
   
   ddd --debugger /usr/local/bin/armeb-linux-gdb
6. Connect to the NSLU2 from DDD/GDB by typing:
   
   target remote YourNSLU2sIP:5000