Method and a device for booting a computer at a programmed time

• US 5,426,775 A
• Filed: 04/20/1993
• Issued: 06/20/1995
• Est. Priority Date: 05/25/1992
• Status: Expired due to Term

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Company (HP Inc.)
• Inventors: Boccon-Gibod, Philippe
• Primary Examiner(s): Harvey, Jack B.
• Assistant Examiner(s): Myers, Paul R.
• Application Number:
  US08/049,288
• Time in Patent Office: 791 Days
• Field of Search: 395/575, 395/550, 395/700, 395/750, 364/280.2, 364/280.3, 364/280.9, 364/145, 364/273.2, 364/271.5
• US Class Current: 714/36
• CPC Class Codes: G06F 9/4401 Bootstrapping security arrangements therefor G06F21/57

Abstract

A booting method for a microcomputer consists in executing a Power On Self Test program, loading an operating system and executing at least one current startup file including user-selected programs. The method comprises the steps of (a) storing in a non-volatile register, accessible through a bus of the microcomputer, a programmed time associated with a pending task; (b) detecting the coincidence between the time indicated by a permanently powered clock and the programmed time, and powering-on the microcomputer; and (c) executing, instead of at least one current startup file, at least one startup file associated with the pending task.

Claims

1. A booting method for a microcomputer involving executing a test program, loading an operating system to establish an operating environment, and utilizing at least one startup file to tailor that environment, the method comprising the following steps:

(a) storing in a non-volatile store, for each of a plurality of tasks to be executed, a startup file identifier identifying at least one startup file to be used for that task;

(b) storing in a non-volatile store, accessible through a bus of the microcomputer, respective programmed times associated with said plurality of tasks to be executed;

(c) detecting the coincidence between the time indicated by a permanently powered clock and a said programmed time, and storing for the associated task an indication that it is now a pending task, and

(d) as a consequence of detecting said coincidence in step (c), powering on the microcomputer, running said test program, loading said operating system and tailoring the operating environment established thereby utilizing said at least one startup file associated with the task, which task, according to said indication, is a pending task.

2. The booting method of claim 1, wherein:

in step (c), the storing of said indication that said task is now a pending task involves setting a non-volatile task pending bit, accessible through said bus, into an active state;

in step (d), monitoring said task pending bit and upon this bit being set into its active state, powering on the microcomputer; and

resetting said task pending bit out of its active state as soon as the task concerned is completed.

3. The booting method of claim 1, wherein step (d) involves:

loading said operating system from a storage local medium and using one predetermined startup file to tailor the operating system environment;

replacing, on the local medium, said one predetermined startup file with said at least one startup file identified by said startup file identifier;

booting the microcomputer system again, whereby the said at least one startup file identified by said startup file identifier is executed; and

restoring said one predetermined startup file.

4. The booting method of claim 3, wherein said test program involves checking whether the microcomputer has been manually powered on and;

in the event that the microcomputer has been manually powered on, loading said operating system and using a default startup file to tailor the operating system environment;

otherwise, proceeding with the execution of step (d).

5. The booting method of claim 1, further comprising the step of storing for each said task in a respective non-volatile network boot bit accessible through said bus, a value indicating whether, for said task, the operating system should be loaded through the network;

step (d) involving, following power on of the microcomputer, checking the said network bit for the said pending task, and;

if the network boot bit is set, sending through the network a load request, passing as a parameter the startup file identifier associated with said pending task, a server then providing the microcomputer with an operating system and said at least one startup file identified by said startup file identifier;

if the network boot bit is not set;

loading an operating system from a local storage medium and using one predetermined startup file to tailor the operating system environment;

replacing, one the local medium, said predetermined startup file with said at least one startup file identified by said startup file identifier;

booting the microcomputer system again, whereby the said at least one startup file identified by said startup file identifier is executed; and

restoring said one predetermined startup file.

6. The booting method of claim 5, wherein said test program involves checking whether the microcomputer has been manually powered on and;

in the event that the microcomputer has been manually powered on, loading said operating system and using a default startup file to tailor the operating system environment;

otherwise, proceeding with the execution of step (d).

7. The booting method of claim 1, wherein said test program involves checking whether the microcomputer has been manually powered on and;

in the event that the microcomputer has been manually powered on, loading said operating system and using a default startup file to tailor the operating system environment;

otherwise, proceeding with the execution of step (d).

8. The booting method of claim 1, wherein the following steps are carried out by said at least one startup file associated with at least one of said tasks,:

executing specified programs to effect said pending task; and

removing said indication that said task just effected is a pending task.