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10. Run the test in single processor mode (socket 1 must be populated to boot,
Microprocessor FRU isolation
If after reseating or swapping component positions, the suspect component cannot
be located (i.e. DC harness, power pod or processor) and the failure persists,
replace the system board.
Microprocessor - Late Self-test
The processor late self-test helps BIOS to determine whether the processors
present in the system are healthy enough to boot and run the OS. Once the system
memory is initialized, BIOS SAL calls PAL to perform "late self test" on the
processor(s) present in the system. The possible late self-test results for each
processor are:
v Performance restricted - machine will continue through POST until the sign-on
v Functionally restricted - machine will continue through POST until the sign-on
v Catastrophic failure - Itanium 2 processor does not return from PAL in this failure
v Healthy - If the late self test result is healthy, the system continues the boot as
It is at the point of displaying the late self-test errors that any errors encountered
are logged to SEL. This is done because the BIOS will have to reset the system
early in POST, well before the POST error manager is called, in order to selectively
take a failed processor off-line.
Late self-test display
Immediately after the BIOS sign-on banner information is displayed, if any
processor late self- test error is encountered, the BIOS displays the following
message:
Errors found in the processor late self-test. Please wait while the failed processor is
disabled for the next boot. System will reset automatically. After this message is
displayed, the system will be reset.
Late self-test usage notes
Because the late self-test relies on encapsulated PAL code, there are certain
conditions under which the test will operate. These are listed below.
v Only one processor will be disabled per boot cycle.
v On the next boot, the unhealthy processor is not included in the system boot.
v If errors occur during any processor late self-test, the POST error manager will
34
IBM eServer xSeries x382 Type 8834: Hardware Maintenance Manual and Troubleshooting Guide
socket 2 will auto terminate).
banner and memory test results are displayed. At this time the late self-test will
display a message as documented in the next section.
banner and memory test results are displayed. At this time the late self-test will
display a message as documented in the next section.
case. The BIOS assumes this as the last condition after eliminating other
possibilities (in the order Healthy, Functionally, Performance Restricted). Refer to
"Debug methodology and FRU isolation" on page 32.
expected and no messages are displayed.
not be displayed on the boot cycle in which the error is detected.
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