Information handling system including efficient power on initial

Details Information handling system including efficient power on initial Information handling system including efficient power on initial

1995-09-29

1998-03-31

Bowler, Alyssa H.

395651, 39580001, G06F 906

Patent

active

057349002

ABSTRACT:
An information handling system includes one or more processing units, a data management unit, connected to the processor data bus, to a memory system, and to a I/O bus, an address management unit, connected to the processor address bus, to the memory system, to an I/O bus, and to a system initialization storage device, storing an initialization routine and data, wherein system initialization includes, in response to an Initial Program Load Read command issued by a processor, the steps of returning initialization data to the processor if the IPL read is accepted (IPL data available) by a device attached to the processor bus; if no device attached to the processor bus responds with IPL data, passing the read IPL command to the I/O bus under control of the data management unit; if the read command is accepted by an I/O controller attached to the I/O bus, returning initialization data to the processor; if no I/O controller accepts the IPL read command, passing the read command to the system initialization storage device, under the control of the data management unit; and returning initialization data to the processor.

REFERENCES:
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patent: 5305457 (1994-04-01), Takida et al.
patent: 5410699 (1995-04-01), Bealkowski et al.
"Logical IPL Selection Mechanism," IBM Technical Disclosure Bulletin, vol. 29, No. 2, pp. 491-493, Jul. 1986.
"Method to Read Bootstrap Record from Unknown Formatted Device," IBM Technical Disclosure Bulletin, vol. 30, No. 12, pp. 67-70, May 1988.

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