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Preserving Initialization-Detected Errors Disclosure Number: IPCOM000046314D
Original Publication Date: 1983-Jul-01
Included in the Prior Art Database: 2005-Feb-07

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Duke, AH Hartung, MH Scott, EK Vosacek, EH [+details]


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.