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Tornado 2.0 User’s Guide Figure 2-4 Tornado Host-Target Communication Shell Debugger Browser Other Tools WTX PROTOCOL Target Server TARGET SERVER BACK ENDS WDB RPC WDB NetROM WDB Serial WDB Pipe Non-WDB Back End HOST TARGET (or simulator) WDB TARGET AGENT COMMUNICATION INTERFACES Network Comm Interface NetROM Comm Interface Serial Comm Interface Pipe Comm Interface AGENTS WDB Target Agent Non-WDB Agent VxWorks ■ In dual mode, two agents are configured into the run-time simultaneously: a task- mode agent, and a system-mode agent. Only one of these agents is active at a time; switching between the two can be controlled from either the debugger (see 7.5 System-Mode Debugging, p.261) or the shell (5.2.6 Using the Shell for System Mode Debugging, p.170). In order to support a system-mode agent, the target communication path must work in polled mode (because the external agent needs to communicate to the host even when the system is suspended). Thus, the choice of communication path can affect what debugging modes are available. 32
2 Setup and Startup The most common VxWorks communication path—both for server-agent communications during development, and for applications—is IP networking over Ethernet. That connection method provides a very high bandwidth, as well as all the advantages of a network connection. Nevertheless, there are situations where you may wish to use a non-network connection, such as a serial line without general-purpose IP, or a NetROM connection. For example, if you have a memory-constrained application that does not require networking, you may wish to remove the VxWorks network code from the target system during development. Also, if you wish to perform system-mode debugging, you need a communication path that can work in polled mode. VxWorks network interface drivers that do not support polled operations (older versions) cannot be used as a connection for system-mode debugging. Note that the target-server back end connection is not always the same as the connection used to load the VxWorks image into target memory. For example, you can boot VxWorks over Ethernet, but use a serial line connection to perform system-mode debugging. You can also use a non-default method of getting the run-time system itself into your target board. For example, you might burn your VxWorks run-time system directly into target ROM, as described in VxWorks Programmer’s Guide: Configuration and Build. Alternatively, you can use a ROM emulator such as NetROM to quickly download new VxWorks images to the target’s ROM sockets. Another possibility is to boot from a disk locally attached to the target; see VxWorks Programmer’s Guide: Local File Systems. You can also boot from a host disk over a serial connection using the Target Server File System; see 2.6.7 Booting a Target Without a Network, p.53. Certain BSPs may provide other alternatives, such as flash memory. See the reference information for your BSP; Help>Manuals contents>BSP Reference in the Tornado Launcher (or the file wind/docs/BSP_Reference.html). Connecting the target server to the target requires a little work on both the host and target. The next few subsections describe the details for the standard target-server back end connections. 2 2.5.1 Network Connections A network connection is the easiest to set up and use, because most VxWorks targets already use the network (for example, to boot); thus, no additional target set-up is required. Furthermore, a network interface is typically a board’s fastest physical communication channel. When VxWorks is configured and built with a network interface for the target agent (the default configuration), the target server can connect to the target agent 33
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E X Resources E.1 Predefined X Reso
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