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+>User Interface</TITLE
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+NAME="USER-INTERFACE">User Interface</H1
+><P
+>RedBoot
+provides a command line user interface (CLI). At the minimum, this interface
+is normally available on a serial port on the platform. If more than one serial
+interface is available, RedBoot is normally configured to try to use any one
+of the ports for the CLI. Once command input has been received on one port,
+that port is used exclusively until the board is reset or the channel
+is manually changed by the
+user. If the platform has networking
+capabilities, the RedBoot CLI is also accessible using the <TT
+CLASS="COMPUTEROUTPUT"
+>telnet</TT
+> access protocol. By default, RedBoot runs <TT
+CLASS="COMPUTEROUTPUT"
+>telnet</TT
+> on port TCP/9000,
+but this is configurable and/or settable by the user. </P
+><P
+>RedBoot also contains a set of GDB "stubs", consisting of code which supports the GDB remote
+protocol. GDB stub mode is automatically invoked when the '$' character appears
+anywhere on a command line unless escaped using the '\' character.
+The platform will remain in GDB
+stub mode until explicitly disconnected (via the GDB protocol). The GDB stub
+mode is available regardless of the connection method; either serial or network.
+Note that if a GDB connection is made via the network, then special care must
+be taken to preserve that connection when running user code. eCos contains
+special network sharing code to allow for this situation, and can be used
+as a model if this methodology is required in other OS environments.</P
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