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Debug Methodology and Failure Isolation

8.3

Processor - Late Self-test

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:

Functionally restricted – Machine will continue through POST until the sign-on banner

and memory test results are displayed. At this time the late self-test will display a

message as documented in the next section.

Performance restricted – Machine will continue through POST until the sign-on banner

and memory test results are displayed. At this time the late self-test will display a

message as documented in the next section.

Catastrophic failure – Intel® Itanium® 2 processor does not return from PAL in this

failure case. The BIOS assumes this as the last condition after eliminating other

possibilities (in the order Healthy, Functionally, Performance Restricted). – Refer to the

"Processor" section of Debug Methodology and COMPONENT Isolation.

Healthy - If the late self test result is healthy, the system continues the boot as expected

and no messages are displayed.

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.

8.3.1

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.

Intel® Server Platform SR870BH2

Revision 1.1