Method and apparatus for updating firmware resident in an...

Details Method and apparatus for updating firmware resident in an... Method and apparatus for updating firmware resident in an...

G - Physics

06

F

354/243

G06F 12/14 (2006.01) G06F 9/445 (2006.01) G06F 11/14 (2006.01)

Patent

CA 2015305

Abstract of the Disclosure Firmware resident in electrically erasable programmable read only memory ("EEPROM") can be updated by a user while maintaining the intelligence of a computer system during the updating process by a control logic device. The control logic device decodes address and control signals to provide a hardware partitioning of the firmware resident in the EEPROMs to prevent writing to protected partitions af the firmware. Transfer vectors are used to provide indirect accessing of subroutines resident in the firmware. During an updating process, a new version of a subroutine is stored in a free area in the EEPROMs before the transfer vector pointing to the old version of the subroutine is updated. The window of vulnerability to errors during the updating process is minimized by only updating a page of memory containing the transfer vector that points to the old version of the subroutine after the new version has been stored.

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