System and method for updating in-system program

• US 20070169086A1
• Filed: 12/30/2005
• Published: 07/19/2007
• Est. Priority Date: 12/30/2005
• Status: Abandoned Application

• Current Assignee: Silicon Motion Technology Corporation
• Original Assignee: Silicon Motion Technology Corporation
• Inventors: Chang, Wen-Chung, Cheng, Chin-Wei
• Application Number:
  US11/320,600
• Publication Number:
  US 20070169086A1
• Time in Patent Office: Days
• US Class Current: 717/168
• CPC Class Codes: G06F 8/65 Updates security arrangements therefor G06F21/57

Abstract

A system for updating In-System Program (ISP) comprises an ISP loader that is called when an Interrupt Function Table is matched, an ISP RAM space has run out, or a page fault has happened. When an Interrupt Function Table is matched, a Function is partially updated; when an ISP RAM space has run out, a Function is executed; and when a page fault has happened, the page fault address is recorded and the page fault is corrected.

Claims

1. A system for updating an ISP, comprising:

an ISP Loader for loading the ISP from a Flash to a RAM Buffer; and

an Interrupt Function Table,

wherein, the ISP Loader is called to update only part of a Function if the ISP is determined to match an address of the Interrupt Function Table while executing a step for comparing with the Interrupt Function Table.

2. The system of claim 1, wherein the step for comparing with the Interrupt Function Table further comprises a step for setting a return address used for returning to an original address after executing the Function.

3. The system of claim 1, further comprising a Jump/Reset Table for recording an entry point or an exit point when the Function is executed.

4. The system of claim 1, further comprising an ISP Loader Program Position Table for recording a position of an ISP Loader program.

5. The system of claim 1, further comprising a Page Map Table mapping the Function to the flash for indicating a part of flash required to be loaded thereto, when the size of ROM is larger than the size of an ISP.

6. The system of claim 1, wherein the ISP Loader is located at a ROM or a Flash.

7. The system of claim 1, wherein the Interrupt Function Table is programmable.

8. A system for updating an ISP, comprising:

an ISP Loader that loads an ISP from a Flash to a RAM Buffer,

wherein the ISP Loader is called to continue executing a Function if an ISP RAM is determined to have run out while executing a step for determining the space of the ISP RAM.

9. The system of claim 8, further comprising a Jump/Reset Table for recording an entry point or an exit point when the Function is executed.

10. The system of claim 8, further comprising an ISP Loader Program Position Table for recording a position of an ISP Loader program.

11. The system of claim 8, further comprising a Page Map Table mapping the Function to the flash for indicating a part of flash required to be loaded thereto, when the size of ROM is larger than the size of an ISP.

12. The system of claim 8, wherein the ISP Loader is located at a ROM or a Flash.

13. A system for updating an ISP, comprising:

an ISP Loader that loads the ISP from a Flash to a RAM Buffer,

wherein the ISP Loader is called to correct a page fault, if the page fault is determined to have arisen, while executing a step for determining the page fault.

14. The system of claim 13, wherein the step for determining the page fault further comprises a step for recording an address of the page fault.

15. The system of claim 13, wherein the step for determining the page fault further comprises a step for setting a return address used for returning to an original address after executing the Function.

16. The system of claim 13, further comprising a Jump/Reset Table for recording an entry point or an exit point when the Function is executed.

17. The system of claim 13, further comprising an ISP Loader Program Position Table for recording a position of an ISP Loader program.

18. The system of claim 13, further comprising a Page Map Table mapping the Function to the flash for indicating a part of flash required to be loaded thereto, when the size of ROM is larger than the size of an ISP.

19. The system of claim 13, wherein the ISP Loader is located at a ROM or a Flash.

20. A method for updating an ISP, comprising:

a step for detecting existence of a Flash;

a step for detecting an ISP block to be updated if the Flash is detected to exist;

a step for loading the ISP block into a RAM being an ISP RAM sequentially if the ISP to be updated exists in the Flash;

a step for setting an existing flag of the ISP;

a step for executing the main initial program of ROM;

a step for determining the existence of an ISP flag;

a step for executing the ISP, wherein the executing process jumps to an address marked in the ISP RAM and executes the ISP if the ISP flag is determined to exist;

a step for determining whether a next ISP block is called; and

a step for swapping an ISP from the Flash into the ISP RAM if the next ISP block is determined to exist.

21. A method for updating an ISP, comprising:

a step for executing ROM code;

a step for comparing the ISP with an Interrupt Function Table to determine whether an address of the ISP matches the Interrupt Function Table;

a step for calling an ISP Loader if the ISP is determined to match the address of the Interrupt Function Table; and

a step for executing a Function.

22. The method of claim 21, further comprising a step for setting a return address used for returning to an original address after executing the Function.

23. A method for updating an ISP, comprising:

a step for executing ROM code;

a step for determining whether a space of an ISP RAM has run out;

a step for calling an ISP Loader if the space of the ISP RAM is determined to have run out; and

a step for executing a Function.

24. A method for updating an ISP, comprising:

a step for executing ROM code;

a step for determining whether a page fault arises in a RAM buffer;

a step for calling an ISP Loader if the page fault is determined to have arisen in the RAM buffer; and

a step for executing a Function.

25. The method of claim 24, further comprising a step for setting a return address used for returning to an original address after executing the Function.