Initial program load

Details Initial program load Initial program load

1998-05-22

2000-06-27

Robertson, David L.

Electrical computers and digital processing systems: support

Digital data processing system initialization or configuration

Loading initialization program

714 36, G06F 9445

Patent

active

060818921

ABSTRACT:
A computer system comprises a main memory and a battery-backed memory (BRAM) for storing configuration information for use in initial program load (IPL). A read-only memory stores a master version of the configuration information. When the system is powered on, an IPL sequence is performed which checks the BRAM, and then, if the contents of the BRAM are valid, copies the control information from the BRAM into the main memory. Alternatively, if the contents of the BRAM are invalid, the IPL sequence copies the master version of the control information from the read-only memory into the BRAM and also into the main memory.

REFERENCES:
patent: 5220667 (1993-06-01), Ichieda
patent: 5450589 (1995-09-01), Maebayashi et al.
patent: 5918047 (1999-06-01), Leavitt et al.
patent: 5935242 (1999-08-01), Madany et al.
patent: 6003130 (1999-12-01), Anderson
"Power-On Self-Test Memory Configuration Algorithm for Invalid CMOS/NURAM", IBM Technical Disclosure Bulletin, vol. 37, No. 3, Mar. 1994, pp. 563-565.
"Read-Only Memory Recovery in a System with Initial Microcode Load", IBM Technical Disclosure Bulletin, vol. 37, No. 2B, Feb. 1994, pp. 35-37.

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