User`s guide

System Troubleshooting and Diagnostics
5.3 Power-On Self-Test (POST) and ROM-Based Diagnostic (RBD) Failures
Example 5–12 FE Utility Example
>>>TFE
Bitmap=00FF3000, Length=00001000, Checksum=807F, Busmap=00FF8000
Test_number=00, Subtest=00, Loop_Subtest=00, Error_type=00
Error_vector=0060, Severity=02, Last_exception_PC=20057C37
Total_error_count=0004, Led_display=08, Console_display=81, save_mchk_code=00
parameter_1=00000082 2=00000000 3=2000146A 4=00000000 5=20051400
parameter_6=00000001 7=00000000 8=00000020 9=00000000 10=00000000
previous_errors, Test Subtest Loop_Subtest Error_Type
Test_81_02_00_FE Test_40_06_00_FF Test_E8_03_00_FF Test_E4_02_00_FF
Flags=FFFF FFFCFC 0408443E BCache_Disable=06 KA52 128KB BC 14.0 ns
Return_stack=201406CC, Subtest_pc=2005D7FF, Timeout=000007D0
>>>
5.3.2 Overriding Halt Protection
The ROM diagnostics are run in halt-protected space during execution after
power-up of the system. During this time they cannot normally be halted
with the BREAK key or the HALT button. After power-up is complete, all
diagnostics including the power-up script (A1) or (0) are run with halts enabled
allowing a user to stop a script or test. The preferred method to stop scripts is
to use CONTROL C first.
5.3.3 Isolating Memory Failures
This section describes procedures for isolating memory subsystem failures.
Memory tests numbers are DC, 31, 30, 4F, 4E, 4B, 4A, 4C, 48, 4D, 47 and 40.
All of these tests are run during power-up.
Normally, if one or more of these tests fail during power-up at the end of
power-up the diagnostic executive will execute the SHOW MEMORY command
automatically to help identify the memory failure. In all cases of a memory
failure, the primary means to isolate to the FRU is to use the SHOW MEMORY
command.
Example 5–13 shows a memory failure due to a missing SIMM. In this case
only one 16-MB set (4 SIMMs of 4 MB each) is present, and one of these
is missing. Because of this, test DC fails and the power-up script is halted
because no usable memory is present. At the end, SHOW MEMORY is
automatically executed before the test is halted. In this example, SIMM set
1 (1E,1F,1G,1H) is present but SIMM 1F is either missing or not correctly
installed in its socket.
5–48 System Troubleshooting and Diagnostics