System Troubleshooting and Diagnostics
5.3 Interpreting Power-On Self-Test and ROM-Based Diagnostic Failures
Example 5–12 FE Utility Example
>>>T FE
Bitmap=07FEC000, Length=00008000, Checksum=0000, Busmap=07FF8000
Test_number=00, Subtest=00, Loop_Subtest=00, Error_type=00
Error_vector=0000, Severity=02, Last_exception_PC=00000000
Total_error_count=0000, Led_display=09, Console_display=9E, save_mchk_code=00
parameter_1=00000000
2=00000000
3=00000000
4=00000000
5=00000000
parameter_6=00000000
7=0001E9FC
8=0001EEE5
9=0001EC72 10=00000000
previous_error=00000000, 00000000, 00000000, 00000000
Flags=FFFF C050 443E
BCache_Disable=06
KA680, 128KB BC,
14.0 ns
Return_stack=201406A8, Subtest_pc=2005B225, Timeout=00030D40
Interrupted test number = 48, Subtestlog=04, Loop_Subtestlog=00, Error_type=FF
>>>
The most useful fields displayed above are as follows:
• Error_vector, which is the SCB vector through which the unexpected
interrupt or exception trapped if de_error equals FE or EF.
• Total_error_count. Four hex digits showing the number of previous errors
that have occurred.
• Parameters 1 through 10. Valid only if the test halts on error.
• Previous_error. Contains the history of the last four errors. Each longword
contains four bytes of information. From left to right these are the de_
error, subtest_log, test, and subtest number (00=FF in the de_error).
• Save machine check code (save_mchk_code). Valid only if the test halts
on error. This field has the same format as the hardware error summary
register.
5.3.2 Overriding Halt Protection
The ROM-based diagnostics run in halt-protected space. When you want to
halt diagnostic execution, if the diagnostic program hangs during execution or
if the run time of the diagnostic program is so long you want to suspend it,
enter the following commands:
>>>E 20140010
!Examine the SSCCR
P 20140010
00D55570
>>>D * 00D05570
!Clear halt-protected space
>>>T 0
!Tests can now be halted
This state is in effect only until the first break or a restart.
System Troubleshooting and Diagnostics 5–59
