Method for patching ROM instructions in an electronic...

Details Method for patching ROM instructions in an electronic... Method for patching ROM instructions in an electronic...

2004-04-08

2008-09-09

Kim, Matt (Department: 2186)

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

C711S159000

Reexamination Certificate

active

07424570

ABSTRACT:
A mechanism for patching read only memory (ROM) instructions in an embedded system is provided. The embedded system includes non-volatile memory such as a ROM, a RAM and an EEPROM. In one configuration, the ROM contains application modules (subroutines) that are subordinate to a flag status. The flag status indicates to the subroutine whether to execute the ROM instructions in the ROM or the extended instructions in the EEPROM. The instructions in the EEPROM may be used to patch or to extend the behaviors masked in the ROM instructions. The extended instructions in the EEPROM may reuse the ROM instructions in the ROM without resulting in recursive actions.

REFERENCES:
patent: 6536038 (2003-03-01), Ewertz et al.
patent: 2003/0084229 (2003-05-01), Ho et al.
patent: 2003/0196051 (2003-10-01), Mahria
patent: 2004/0128471 (2004-07-01), Oakley et al.
patent: 2004/0210720 (2004-10-01), Wong et al.

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