Semiconductor device including secure patchable ROM and patch method thereof
US11270003B2 · kind B2 · utility
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20Claims
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Key dates
| Filing date | Apr 27, 2020 |
| Grant date | Mar 8, 2022 |
| Priority date | — |
| Expiry date | Apr 27, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2221/033
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method for patching a patchable function programmed in a read only memory (ROM) of a semiconductor device by using firmware loaded onto a first memory includes receiving an encrypted and digitally signed firmware image; generating a verification result by verifying the firmware image by using a public key; decrypting the firmware image by using a secret key depending on the verification result; loading firmware decrypted from the firmware image onto the first memory; and running a replacement function corresponding to an identifier of the patchable function included in the firmware, when the patchable function is called.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.