Method and apparatus standardizing use of non-volatile memory within a BIOS-ROM

• US 6,009,520 A
• Filed: 12/10/1997
• Issued: 12/28/1999
• Est. Priority Date: 12/10/1997
• Status: Expired due to Term

• Current Assignee: Phoenix Technologies Limited (Pharaoh Acquisition LLC)
• Original Assignee: Phoenix Technologies Limited (Pharaoh Acquisition LLC)
• Inventors: Gharda, Laurent Kirk
• Primary Examiner(s): Palys, Joseph E.
• Assistant Examiner(s): Mai, Rijue
• Application Number:
  US08/988,603
• Time in Patent Office: 748 Days
• Field of Search: 395/651, 395/600, 395/681, 395/622, 395/281, 395/442, 395/500, 395/182.06, 707/101, 713/1, 713/2, 713/100, 710/104, 709/300
• US Class Current: 713/1
• CPC Class Codes: G06F 8/60 Software deployment
• CPC Class Codes: G06F 9/4401 Bootstrapping security arrangements therefor G06F21/57

Abstract

A Basic Input-Output System (BIOS) includes a management and driver module adapted to accomplish editing functions for the BIOS. Plug-in modules are added to the BIOS by submitting the plug-ins to the driver module, which determines compatibility and available space for adding, and acts accordingly, adding a candidate module to the BIOS if space is available and the plug-in module is determined to be compatible with the BIOS and the driver module. Plug-ins can also be removed by action of the driver module, which also performs management functions in identifying and initializing resident plug-in modules.

Claims

1. A Basic Input Output System (BIOS) program, comprising:

BIOS function code modules; and

a BIOS editing management driver code module;

wherein the BIOS editing management driver code module is adapted to scan a candidate code module presented for addition to the BIOS program, to validate the candidate module as compatible and authorized to be added, to scan the BIOS program for space available to add the candidate module, and to add the candidate module if validated and space is available.

2. The BIOS program of claim 1 wherein the BIOS program includes a Power On Self Test (POST) routine, and the BIOS editing management driver code module is further adapted to cooperate with the POST routine as the POST routine is executed to identify and initiate code modules for execution.

3. A Basic Input Output System (BIOS) comprising:

a non-volatile storage device;

a BIOS program residing on the non-volatile storage device and occupying a first number of bytes in a first storage region; and

a BIOS editing management driver code module residing on the non-volatile storage device and occupying a second number of bytes in a second storage region, wherein the first number of bytes and the second number of bytes together are less than the maximum byte capacity by a third number of bytes defining a third storage region for storing plug-in modules;

wherein the BIOS editing management driver code module has access to specifics of all resident code and characteristics of the storage device, and is adapted, upon execution, to add plug-in modules and to and remove plug-in modules from the storage device in the third storage region.

4. The BIOS of claim 3 wherein addition of a plug-in module is managed by transferring a physical copy of the BIOS program, the BIOS editing management driver code module, and any existing plug-in modules in the third storage region to random-access memory (RAM), scanning any candidate plug-in module for validity and compatibility, confirming space available for adding the candidate, adding the candidate to the physical map in the third storage region if space is available and the candidate is valid, creating thereby a new physical map, erasing the non-volatile storage device, and copying the new physical map to the non-volatile storage device.

5. The BIOS of claim 3 wherein the non-volatile storage device is a flash ROM, and erasing involves flash-erasing the ROM.

6. The BIOS of claim 5 wherein the flash-ROM has an overall capacity of at least two mega-bits (Mb).

7. The BIOS of claim 3 wherein addition of a plug-in module is managed by transferring a physical copy of at least the third storage region to random-access memory (RAM), scanning any candidate plug-in module for validity and compatibility, confirming space available in the third storage region for adding the candidate module, adding the candidate module to the physical map in the third storage region if space is available and the candidate module is valid, creating thereby a new physical map, erasing the portion of the non-volatile storage device transferred to RAM, and copying the new physical map to the non-volatile storage device.

8. The BIOS of claim 3 wherein the BIOS program includes a Power On Self Test (POST) routine, and the BIOS editing management driver code module is further adapted to cooperate with the POST routine as the POST routine is executed to identify and initiate code modules for execution.

9. A method for adding a plug-in module to a BIOS program, comprising step of:

(a) scanning a candidate plug-in module by a BIOS editing management driver program provided as a part of the BIOS program; and

(b) adding the plug-in module if and only if the scan determines the plug-in module is compatible with the BIOS program.

10. The method of claim 9, further comprising a step for accepting a delete command for a plug-in module by the BIOS editing management driver program, and executing the command by deleting the plug-in module.

11. The method of claim 9 wherein the BIOS program is stored in a non-volatile storage device, and further comprising a step for transferring a physical copy of the content of the non-volatile storage device to Random Access Memory (RAM) before the step for scanning, and a step for reprogramming the non-volatile storage device with a copy of the BIOS program including the added plug-in.

12. The method of claim 11 wherein the non-volatile storage device is a flash-ROM chip.

13. The method of claim 9 wherein the BIOS is stored in a non-volatile storage device, and further comprising a step for transferring a physical copy of at least a re-programmable portion of the non-volatile storage device to random-access memory (RAM) before the step for scanning, and a step for reprogramming the re-programmable portion including a copy of the added plug-in.

14. The method of claim 13 wherein the non-volatile storage device is a flash-ROM chip.

15. A method for editing a BIOS program, comprising steps of:

(a) providing an executable BIOS editing management driver module in the BIOS program;

(b) submitting proposed edits to the driver module; and

(c) accomplishing the proposed edits if and only if the driver module determines the edits are compatible with the BIOS program.

16. The method of claim 15 wherein proposed edits comprise adding and deleting plug-in modules.

17. The method of claim 15 wherein the BIOS program is resident on a non-volatile storage device, and edits are accomplished by making a physical copy of the non-volatile storage device in RAM, including the code stored in the storage device, editing the copy in RAM, erasing at least the portion of the storage device where the edited code will reside, and copying the edited RAM copy back to the storage device.

18. A Basic Input-Output System (BIOS) cooperative software suite, comprising:

a BIOS layer comprising BIOS function code;

a BIOS editing management driver module adapted to perform editing and management functions with the BIOS layer; and

an application layer adapted to create plug-in modules compatible with the BIOS layer and the driver module;

wherein the driver module is adapted to scan candidate plug-in modules to be added to the BIOS layer, to determine if the modules are compatible, to check for space available to add, and to the plug-in candidate modules only if space is available and the modules are determined to be compatible.

19. The software suite of claim 18 wherein the BIOS layer is stored on a non-volatile storage device, including the BIOS editing management driver module, and plug-in modules are added by creating a physical copy of the non-volatile storage device in random access memory (RAM), adding the candidate module in the physical copy, erasing the non-volatile storage device, and copying the changed physical copy back to the non-volatile storage device.

20. The software suite of claim 19 wherein the non-volatile storage device is a flash-ROM chip.

21. The software suite of claim 18 wherein management functions of the BIOS editing management driver module include identifying and initializing plug-in modules for execution.