User`s guide

MPC8240 and MPC8260 Emulation 133
Chapter 10: Troubleshooting the Emulator
Problems with the Target System
Now you can do some more tests:
3
Enter the reset command:
U>rst
U>
If the prompt after rst is "?>" A bad status code (0xXX) was received
from the processor. Valid status is 0x01, any
other status indicates bad scan of the
instriction register or failure of the reset
signals. Verify TCK, TDO, TDI, TMS, and
TRST
are all changing state on an HRESET.
If the rst command fails Set "cf reset=stop" (no external bus cycles
used in this mode), then enter the "rst"
command again:
*>cf reset=stop
*>rst
M>
You can enter these commands at any
prompt, shown here as "*>".
• If the prompt is "M>" with no error
messages, all scans worked. We have
control as long as we don’t try to run
code.
• If an error message is displayed, verify
that HRESET
and SRESET are being
driven.
• If the prompt is "c>", there was bad
scanning of the data scan chain. Check
processor mask revision.
• If the prompt is "U>", the processor
failed to stop soft or hard. Check reset
lines, mask revision, processor type and
firmware version.
If the prompt after rst is
"U>"
The HRESET
and SRESET lines are
working.