the resources required by the target application (for example, an IP stack)

the debugging facilities available on the target (for example, a GDB stub)

whether or not your target has an embedded OS, such as Linux, that is running gdbserver instances.

Summary of the connection methods for each debugging mode

Connections to a target without built-in GDB support (RVI-GDB)

Connections to a target with a GDB stub (Target-GDB)

Connections to a target GDB stub using Virtual Ethernet/TTY mode (Target-GDB-Virtual Ethernet)

Connections to a target OS using gdbserver (GDBserver)

Connections to a target OS using NFS (GDB-NFS).