Method and apparatus for updating a microcode image in a memory

Details Method and apparatus for updating a microcode image in a memory Method and apparatus for updating a microcode image in a memory

2006-08-08

2006-08-08

Browne, Lynne H. (Department: 2116)

Electrical computers and digital processing systems: support

Digital data processing system initialization or configuration

Loading initialization program

C713S001000, C713S100000, C717S168000

Reexamination Certificate

active

07089414

ABSTRACT:
A method, apparatus, and computer instructions for determining validity of and updating a microcode image. Responsive to initiation of an update process, a first validity indicator is checked to determine whether a first microcode image in the memory is valid. In response to the first microcode image being valid, a second validity indicator is set indies, to indicate that a second microcode image is invalid, and the update process is allowed to update the second microcode image to form an updated microcode image. A determination is made as to whether the updated microcode image is valid. The second validity indicator is set to indicate that the updated microcode is valid if the updated image is valid. The second validity indicator is checked during booting of a data processing system. If the second validity indicator is valid, the updated microcode will be loaded.

REFERENCES:
patent: 6205548 (2001-03-01), Hasbun
patent: 6308265 (2001-10-01), Miller
patent: 6317827 (2001-11-01), Cooper
patent: 6584559 (2003-06-01), Huh et al.
patent: 6615404 (2003-09-01), Garfunkel et al.
patent: 6622246 (2003-09-01), Biondi

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