Method of Writing Firmware, Firmware Storage Medium, and Electronic Device
AssigneeSeiko Epson Corporation
InventorsShingo Todaka, Isao Eguchi
Life of this patent
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Abstract
Writing only incompatible firmware is reliably prevented without limiting writing other firmware. A firmware storage area is reserved in printer memory, and an evaluation area for writing evaluation data is reserved in the boot sector at the beginning of the firmware storage area. When the firmware overwriting process starts, the printer control unit gets the evaluation data, which is firmware data overwritten to a fixed address set as the evaluation area, and based on this evaluation data determines whether to complete or abort the firmware writing process.
Claims8
A method of writing firmware in an electronic device, wherein:
- part of the firmware storage area in the electronic device is reserved as an evaluation area for determining whether to allow overwriting the firmware;
- and
- a control unit of the electronic device executes a first step of starting to acquire overwrite data for overwriting the firmware, and acquiring evaluation data for overwriting the evaluation area, based on input of a firmware overwrite command,
- a second step of deciding whether to overwrite the firmware based on the content of the acquired evaluation data, and
- completes overwriting the firmware when overwriting the firmware is allowed in the second step.
Dependencies are inferred from the claim text.