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1. (WO2015127330) SYSTEM AND METHOD FOR MODIFICATION OF CODED INSTRUCTIONS IN READ-ONLY MEMORY USING ONE-TIME PROGRAMMABLE MEMORY

Pub. No.:    WO/2015/127330    International Application No.:    PCT/US2015/016989
Publication Date: Fri Aug 28 01:59:59 CEST 2015 International Filing Date: Sun Feb 22 00:59:59 CET 2015
IPC: G06F 12/06
G06F 9/445
G06F 9/32
Applicants: QUALCOMM INCORPORATED
Inventors: LI, Yanru
CHUN, Dexter
PACKER ALI, Dhamim
UVIEGHARA, Gregory
WANG, Zhongze
Title: SYSTEM AND METHOD FOR MODIFICATION OF CODED INSTRUCTIONS IN READ-ONLY MEMORY USING ONE-TIME PROGRAMMABLE MEMORY
Abstract:
Various embodiments of methods and systems for flexible read only memory ("ROM") storage of coded instructions in a portable computing device ("PCD") are disclosed. Because certain instructions and/or data associated with a primary boot loader ("PBL") may be defective or in need of modification after manufacture of a mask ROM component, embodiments of flexible ROM storage ("FRS") systems and methods use a closely coupled one-time programmable ("OTP") memory component to store modified instructions and/or data. Advantageously, because the OTP memory component may be manufactured "blank" and programmed at a later time, modifications to code and/or data stored in an unchangeable mask ROM may be accomplished via pointers in fuses of a security controller that branch the request to the OTP and bypass the mask ROM.