Tornado

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Tornado 2.0 User’s Guide Figure 2-3 Assembling VME Targets CPU system controller ■ information reference indicate the location of the system controller enable jumper, if any. Alternatively, a separate system controller board can be installed in the first slot and the CPU and Ethernet boards can be plugged into the next two slots. Empty Slots. The VME bus has several daisy chained signals that must be propagated to all the boards on the backplane. If you leave any slot empty between boards on the backplane, you must jumper the backplane to complete the daisy chain for the BUS GRANT and INT ACK signals. Connecting the Cables All supported VxWorks targets include at least one on-board serial port. This serial port must be connected to an ASCII terminal (or equivalent device), at least for the initial configuration of the boot parameters and getting started with VxWorks. Subsequently, VxWorks can be configured to boot automatically without a terminal. Refer to the CPU board hardware documentation for proper connection of the RS-232 signals. For the Ethernet connection, a transceiver cable must be connected from the Ethernet controller to an Ethernet transceiver. 30
2 Setup and Startup 2.5 Host-Target Communication Configuration Tornado host tools such as the shell and debugger communicate with the target system through a target server. A target server can be configured with a variety of back ends, which provide for various modes of communication with the target agent. On the target side, VxWorks can be configured and built with a variety of target agent communication interfaces. Your choice of target server back end and target agent communication interface is based on the mode of communication that you establish between the host and target (network, serial, and so on). In any case, the target server must be configured with a back end that matches the target agent interface with which VxWorks has been configured and built. See Figure 2-4 for a detailed diagram of host-target communications. The default configurations for both the VxWorks target agent and Tornado target servers are for a network connection. If you are using a network connection, you can proceed with booting your target (2.6 Booting VxWorks, p.45). 2 ! WARNING: If you are using a connection other than network (the default), you must rebuild VxWorks with the appropriate target agent communication interface, and configure a target server with the corresponding back end, before you can use Tornado tools with your target. See 4.6 Configuring the Target-Host Communication Interface, p.137 and 2.5 Host-Target Communication Configuration, p.31. All of the standard back ends included with Tornado connect to the target through the WDB target agent. Thus, in order to understand the features of each back end, you must understand the modes in which the target agent can execute. These modes are called task mode, system mode, and dual mode. ■ ■ In task mode, the agent runs as a VxWorks task. Debugging is performed on a per-task basis: you can isolate the task or tasks of interest without affecting the rest of the target system. In system mode, the agent runs externally from VxWorks, almost like a ROM monitor. This allows you to debug an application as if it and VxWorks were a single thread of execution. In this mode, when the target run-time encounters a breakpoint, VxWorks and the application are stopped and interrupts are locked. One of the biggest advantages of this mode is that you can single-step through ISRs; on the other hand, it is more difficult to manipulate individual tasks. Another drawback is that this mode is more intrusive: it adds significant interrupt latency to the system, because the agent runs with interrupts locked when it takes control (for example, after a breakpoint). 31
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C Tornado Tools Reference EXAMPLE R
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D Utilities Reference aoutToBin - e
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E X Resources E.1 Predefined X Reso
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Index Symbols ? (C/Tcl interpreter
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Index assembler options, specifying
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Index download options 260 download
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Index creating 100 linking 103 open
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Index info command (CrossWind) 258
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Index unreserved 82 virtual console
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