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Power On Self Test Error Filter for High-Availability Servers

IP.com Disclosure Number: IPCOM000111360D
Original Publication Date: 1994-Feb-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Dunham, SN: AUTHOR [+2]

Abstract

Disclosed is a routine to be run at the end of the Power On Self Test (POST) prosess, before either the operating system or the reference partition is booted, in order to allow the loading of the operating system without user intervention, even if certain types of errors have been detected during the POST test.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 72% of the total text.

Power On Self Test Error Filter for High-Availability Servers

      Disclosed is a routine to be run at the end of the Power On
Self Test (POST) prosess, before either the operating system or the
reference partition is booted, in order to allow the loading of the
operating system without user intervention, even if certain types of
errors have been detected during the POST test.

      This POST error filter searches the error log in the EBDA
(Extended BIOS Data Area) to determine the classes of errors which
have occurred during POST test.  The class of an error is indicated
by the high-order byte of the two-byte error code with which it is
associated.  If only errors of types specified by the customer as
acceptable for bypass in this situation have occurred, the POST error
filter causes the errors to to be ignored by clearing the error log
and by loading the operating system.

      With this feature, the purchaser of a server requiring high
availability and having redundant hardfiles and SCSI adapters can
determine the errors, if any, to be ignored during POST testing.
There are two classes of errors which can be selected.  The first of
these classes contains devices which are duplicated in the system
configuration, such as hardfiles and SCSI adapters.  The second class
contains features that may not be critical in a specific server
application, such as a diskette drive, a parallel port, or a serial
port.

      This POST error filter can be used in com...