Memory Requirements; Using Ppcbug - Motorola MVME2300SC Series Installation And Use Manual

Memory Requirements

PPCBug requires a maximum of 512KB of read/write memory (i.e.,
DRAM). The debugger allocates this space from the top of memory. For
example, a system containing 64MB ($04000000) of read/write memory
will place the PPCBug memory page at locations $03F80000 to
$03FFFFFF.

Using PPCBug

PPCBug is command-driven; it performs its various operations in response
to commands that you enter at the keyboard. When the PPC1-Bug prompt
appears on the screen, the debugger is ready to accept debugger
commands. When the PPC1-Diag prompt appears on the screen, the
debugger is ready to accept diagnostics commands.
To switch from one mode to the other, enter SD (Switch Directories). To
examine the commands in the directory that you are currently in, use the
Help command (HE).
What you key in is stored in an internal buffer. Execution begins only after
you press the Return or Enter key. This allows you to correct entry errors,
if necessary, with the control characters described in the PPCBug
Firmware Package User's Manual, Chapter 1.
After the debugger executes the command you have entered, 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. Alternatively, 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, Chapter 5). For more about
this, refer to the GD, GO, and GT command descriptions in the PPCBug
Firmware Package User's Manual, Chapter 3.
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Using PPCBug
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