User`s guide

132 MPC8240 and MPC8260 Emulation
Chapter 10: Troubleshooting the Emulator
Problems with the Target System
To interpret the initial prompt
The initial prompt can be used to diagnose several common problems.
To get the most information from the prompt, follow this procedure:
1
Connect the emulation module to your target system.
2
Set the default configuration settings. Enter:
M>init -c
If you are using the MPC8240, also enter:
M>cf proc=MPC8240
You can enter this command at any prompt. The emulation module will
respond with the same information as printed by the “ver” command.
If the response is “!ERROR
905! Driver firmware is
incompatible with ID of
attached device”
Make sure the target interface module is
connected to the cable of the emulation
module, then try the “init -c” command
again.
If the initial prompt is “p>” Check pin 6 on header, 3.3V (VDD).
If the initial prompt is “M>” The processor entered debug mode without
the help of the emulation module. Is
another debugger connected?
If the initial prompt is "c>" Processor is checkstopped. Something
caused a machine exception before the
emulation module connected or
CHECKSTOP
is being pulled or held low.
If the initial prompt is "?>" A bad status code (0xXX) was received
from the processor. Valid status is 0x01 or
0x05. Any other status indicates a bad scan
of the instruction register. Check TCK,
TDO, TDI, TMS, and TRST
signals. Check
the firmware revision.
If the initial prompt is “U>” Processor is running and the emulation
module is scanning the instruction register
correctly.