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Embedded Linux Primer: A Practical, Real-World ApproachA JTAG probe contains a small connector designed for connection to your target board. It is often a simple square-pin header and ribbon cable arrangement. Most modern high-performance CPUs contain a JTAG interface that is designed to provide this software debugging capability. The JTAG probe connects to this CPU JTAG interface. The other side of the JTAG probe connects to your host development system usually via Ethernet, USB, or a parallel port. Figure 14-6 details the setup for the Abatron unit. Figure 14-6. Hardware JTAG probe debugging JTAG probes can be complicated to set up. This is a direct result of the complexity of the CPU to which it is connected. When power is applied to a target board and its CPU comes out of reset, almost nothing is initialized. In fact, many processors need at least a small amount of initialization before they can do anything. Many methods are available for getting this initial configuration into the CPU. Some CPUs read a hardware-configuration word or initial values of specific pins to learn their power-on configuration ...» |
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