Method and apparatus for patching pages of ROM

Details Method and apparatus for patching pages of ROM Method and apparatus for patching pages of ROM

1995-12-14

1998-09-01

Chan, Eddie P.

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

711165, 395712, G06F 1202

Patent

active

058025499

ABSTRACT:
A method and apparatus for patching ROM pages using minimal RAM pages is accomplished by reserving a limited number of RAM pages which are shared to facilitate a patching process. The patching process begins when a flagged page of ROM (i.e., a page that is to be patched) is copied into one of the reserved pages of RAM. Having copied the flagged page, a patch file is accessed to retrieve updated code and outdated code of the flagged page. The process overwrites the outdated code with the updated code to produce a patched code. The patched code is read by a processor and is subsequently overwritten by another patched code that represents another flagged page of ROM.

REFERENCES:
patent: 4542453 (1985-09-01), Patrick et al.

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