Motorola CPCI-6020 用户手册

The PPCBug firmware is the layer of software just above the hardware. The firmware provides 
the proper initialization for the devices on the CPCI-6020 baseboard upon power-up or reset. 
The examples in this chapter show PPCBug as the prompt; for the CPCI-6020 baseboard the 
actual debugger prompt will be displayed as MCP820Bug>.

This chapter describes the basics of PPCBug and its architecture. It also describes the monitor 
(interactive command portion of the firmware) in detail, and describes how to use the PPCBug 
debugger and its special commands. A complete list of PPCBug commands appears at the end 
of the chapter. 

 contains information about the CNFG 

and ENV commands (refer to 

), system calls and other advanced user 

topics.

For full user information about PPCBug, refer to the PPCBug Firmware Package User’s Manual 
and the PPCBug Diagnostics User’s Manual, listed in 

The debug firmware, PPCBug, is a powerful evaluation and debugging tool that provides 
facilities for loading and executing user programs under complete operator control for system 
evaluation.

PPCBug provides a high degree of functionality, user friendliness, portability and ease of 
maintenance. Furthermore, PPCBug is portable and easy to understand because it was written 
in the C programming language, except where necessary to use assembler functions.

PPCBug includes commands for:

z

Display and modification of memory

z

Breakpoint and tracing capabilities

z

A powerful assembler and disassembler useful for patching programs

z

A self-test at power-up feature which verifies the integrity of the system

PPCBug consists of three parts:

z

The debugger or PPCBug, which refers to the command-driven, user-interactive software 
debugger

z

The diagnostics, which refers to the command-driven diagnostics package for the CPCI-
6020 hardware

z

A user interface or debug/diagnostics monitor that accepts commands from the system 
console terminal