After the debugger executes the command, the prompt reappears. However, if the command causes execution of user target code (for example, GO) then control may or may not return to the debugger, depending on what the user program does. For example, if a breakpoint has been specified, then control returns to the debugger when the breakpoint is encountered during execution of the user program. Alternately, the user program could return to the debugger by means of the System Call Handler routine RETURN (described in the PPCBug Firmware Package User’s Manual). For more about this, refer to the GD, GO, and GT command descriptions in the PPCBug Firmware Package User’s Manual. A debugger command is made up of the following parts: ❏ The command name, either uppercase or lowercase (for example, MD or md). ❏ Any required arguments, as specified by command. ❏ At least one space before the first argument. Precede all other arguments with either a space or comma. ❏ One or more options. Precede an option or a string of options with a semicolon (;). If no option is entered, the command’s default option conditions are used.
Diagnostic Tests
The individual diagnostic test sets are listed in the following table. The diagnostics are described in the PPC1Bug Diagnostics Manual, listed in Appendix D, Related Documentation.Notes 1. Some diagnostics depend on restart defaults that are set up only in a particular restart mode. Refer to the documentation on a particular diagnostic for the correct mode. 2. Test Sets marked with an asterisk (*) are not available on PPCBug release 3.1 and earlier.
You can use the factory-installed debug monitor
PPCBug, to modify certain parameters contained in the PowerPC board’s Non-Volatile RAM (NVRAM), also known as Battery Backed-up RAM (BBRAM). ❏ The Board Information Block in NVRAM contains various elements concerning operating parameters of the hardware. Use the PPCBug command CNFG to change those parameters. ❏ Use the PPCBug command ENV to change configurable PPCBug parameters in NVRAM. The CNFG and ENV commands are both described in the PPCBug Firmware Package User’s Manual, listed in Appendix D, Related Documentation. Refer to that manual for general information about their use and capabilities. The following paragraphs present additional information about CNFG and ENV that is specific to the PPCBug debugger, along with the parameters that can be configured with the ENV comm
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