Using a terminal with a system model
The Terminal component is a virtual component that enables UART data to be transferred
between a TCP/IP socket on the host and a serial port on the target.
To use the Terminal component with a Microsoft Windows 7 client, you must first install
Telnet. The Telnet application is not installed on Microsoft Windows 7 by default.
Download the application by following the instructions on the Microsoft web site. Search
for “Windows 7 Telnet” to find the Telnet FAQ page. To install Telnet:
. This opens a window that enables you to uninstall or change
- Select Turn Windows features on or off on the left side of the
bar. This opens the Microsoft Windows Features dialog. Select the Telnet
Client check box.
- Click OK. The installation of Telnet might take several minutes
The following figure shows a block diagram of one possible relationship between the target
and host through the Terminal component. The TelnetTerminal block is what you configure when
you define Terminal component parameters. The Virtual Machine is your FVP.
Figure 2-5 Terminal block diagram
On the target side, the console process invoked by your target OS relies on a suitable
driver being present. Such drivers are normally part of the OS kernel. The driver passes
serial data through a UART. The data is forwarded to the TelnetTerminal component, which
exposes a TCP/IP port to the world outside of the FVP. This port can be connected to by, for
example, a Telnet process on the host.
By default, the FVP starts four telnet Terminals when the model is initialized. You can
change the startup behavior for each of the four Terminals by modifying the corresponding
If the Terminal connection is broken, for example by closing a client telnet session, the
port is re-opened on the host. This might have a different port number if the original one
is no longer available. Before the first data access, you can connect a client of your
choice to the network socket. If there is no existing connection when the first data access
is made, and the
start_telnet parameter is
true, a host
telnet session is started automatically.
The port number of a particular Terminal instance can be defined when the FVP starts. The
actual value of the port used by each Terminal is declared when it starts or restarts, and
might not be the value you specified if the port is already in use. If you are using Model
Shell, the port numbers are displayed in the host window in which you started the model.
You can start the Terminal component in either telnet mode or raw mode.
In telnet mode, the Terminal component supports a subset of the RFC 854 protocol. This
means that the Terminal participates in negotiations between the host and client concerning
what is and is not supported, but flow control is not implemented.