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Method and apparatus for booting a computer system by restoring the main memory from a backup memory

Filing Information

Patent Number: US5269022
Application Number: US7673394
Filing date: 03/22/1991
Issue date: 12/07/1993
Predicted expiration date: 03/22/2011

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Inventor(s): Kazuya Shinjo · Eiji Ishibashi ·
Assignee(s): Kabushiki Kaisha Toshiba · View assignee updates
Attorney/Agent(s): Oblon, Spivak, McClelland, Maier & Neustadt ·
Primary Examiner: Kevin A. Kriess ·

U.S. Classifications: 395/700 · 364/DIG.1 ·
International Classifications: G06F 924 ·
International Classifications: 395700;575 ·
Foreign Priority: JP276605 - 03/28/1990 ·
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USPTO · PAIR · esp@cenet · Patent Family
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Abstract

In a computer system, when the system is first booted in a normal mode, main memory data stored in a main memory immediately after the system is booted, is stored as backup data in a backup memory or the like. A backup flag representing whether or not the backup data can be restored is set and the system is rebooted. When the system is next booted in the normal mode, the backup data stored in the backup memory or the like is restored as the main memory data in the main memory. The backup flag is automatically reset in a maintenance mode.

References Cited

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Referenced By

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Patent Family

Document Number	Assignee	Inventors	Issue/Pub Date
US5269022	Kabushiki Kaisha Toshiba	Kazuya Shinjo et al.	Dec 1993
JP2772103			Jul 1998

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Independent Claims | See all claims (13)

1. A method for booting a computer system having a main memory for storing main memory data, a backup memory for storing main memory data as backup data, a boot mode which indicates a normal mode and a maintenance mode, and a flag representing if the backup data can be restored into the main memory as the main memory data, when the flag is set, the backup data can be restored into the main memory as main memory data and when the flag is not set, the backup data cannot be restored as the main memory data into the main memory, comprising the steps of:determining, by a determination means of the computer system, if the boot mode of the computer system indicates the normal mode or the maintenance mode;saving, by a savings means of the computer system, the main memory data stored in the main memory in the backup memory when the boot mode indicates the normal mode and the flag is not set; andrestoring, by a restoring means of the computer system, the backup data saved in the backup memory into the main memory when the boot mode indicates the normal mode and the flag is set.
4. An apparatus for booting a computer system, comprising:a main memory for storing main memory data;means for setting a boot mode which indicates a normal mode and a maintenance mode;a backup memory for storing the main memory data as backup data immediately after the computer system is booted; anda flag, which when set, the backup data can be restored in the main memory as the main memory data and when not set, the backup data cannot be restored into the main memory as the main memory data; andmeans for restoring the backup data into the main memory as the main memory data when the boot mode indicates the normal mode and the flag is set.
10. A method for booting a computer system having a main memory for storing main memory data, a backup memory for storing main memory data as backup data, a boot mode which indicates a normal mode and a maintenance mode, and a flag representing if the backup data can be restored into the main memory as the main memory data, when the flag is set, the backup data can be restored into the main memory as main memory data and when the flag is not set, the backup data cannot be restored as the main memory data into the main memory, comprising the steps of:determining, by a first determining means of the computer system, if the boot mode of the computer indicates the maintenance mode;determining, by a second determining means of the computer system, if the backup flag is set; andrestoring main memory data from the backup memory to the main memory when the first determining means determines that the boot mode does not indicate the maintenance mode and the second determining means determines that the backup flag is set.

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