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Browse Prior Art Database

Control Method for Handling Errors During Power-on Sequence

IP.com Disclosure Number: IPCOM000100164D
Original Publication Date: 1990-Mar-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 1 page(s) / 52K

Publishing Venue

IBM

Related People

Garofalo, FJ, Jr: AUTHOR [+2]

Abstract

Disclosed is a method for handling errors detected by "self-test" during power-on sequence, in a way that will allow the machine to become operational if possible.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 58% of the total text.

Control Method for Handling Errors During Power-on Sequence

       Disclosed is a method for handling errors detected by
"self-test" during power-on sequence, in a way that will allow the
machine to become operational if possible.

      When a machine is operational and a failure occurs, there is a
combination of hardware and microcode which will try and recover and
keep the machine operational.  If there was such a recoverable error
condition, and the machine was powered down, either because of loss
of power or because it was the end of a shift, the machine should
become operational when power is restored.  Normally, this would not
happen because the error would be detected during power-on sequence.
As part of the power-on sequence built-in self-tests (BISTs) are run
to check out the machine.  The tests would detect the error and
cannot know that it is recoverable, so that power-on sequence stops
and the failure is reported.  Because the BISTs are exhaustive they
may even detect errors which would not affect operation; however, the
machine would not become operational.  There are times, though, when
it is desirable to stop on the error and not continue with the
power-on sequence.  During manufacturing or service you may want to
know immediately of all failures and not waste time initializing the
machine.  Both of these conditions must be allowed for.

      The solution is to keep track of any failure that is not
catastrophic, during the power-on seque...