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Preserving Initialization-Detected Errors

IP.com Disclosure Number: IPCOM000046314D
Original Publication Date: 1983-Jul-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Duke, AH: AUTHOR [+4]

Abstract

A peripheral subsystem can power up before a host has completed its initial program load (IPL). Until the host processor has completed its IPL, it has limited error handling. As a result, some critical errors detected by the peripheral subsystem during its initialization (initial microprogram load (IML)) may be lost in the data processing system. Accordingly, the peripheral subsystem logs the errors during its IML and saves the errors until the host has issued a predetermined number (Image Omitted) the peripheral subsystem which are counted in the SIO counter. Upon the host completing its IPL processing, data processing operations ensue, which may result in additional SIOs being issued to the peripheral subsystem, which also increment the SIO counter.

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Preserving Initialization-Detected Errors

A peripheral subsystem can power up before a host has completed its initial program load (IPL). Until the host processor has completed its IPL, it has limited error handling. As a result, some critical errors detected by the peripheral subsystem during its initialization (initial microprogram load (IML)) may be lost in the data processing system. Accordingly, the peripheral subsystem logs the errors during its IML and saves the errors until the host has issued a predetermined number

(Image Omitted)

the peripheral subsystem which are counted in the SIO counter. Upon the host completing its IPL processing, data processing operations ensue, which may result in additional SIOs being issued to the peripheral subsystem, which also increment the SIO counter. Since the IPL processing for the host is known when the peripheral subsystem is attached to the host, the SIO threshold for ensuring suitable IPL processing completion is preset in the SIO counter. When the SIO counter has reached such predetermined number of SIOs received, it issues an "IPL okay" signal for the peripheral subsystem to report errors. At this time the peripheral subsystem examines the error log to determine whether or not any errors should be reported upon the next received SIO. If so, upon receipt of the next SIO, the errors are suitably reported to the host for error processing purposes.

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