The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 04, 2022
Filed:
May. 14, 2020
Nuvoton Technology Corporation, Hsinchu Science Park, TW;
Moshe Alon, Tel-Aviv, IL;
Avraham Fishman, Raanana, IL;
Ben Bender, Beit Shemesh, IL;
Boaz Tabachnik, Gimzo, IL;
Eyal Cohen, Kfar Saba, IL;
NUVOTON TECHNOLOGY CORPORATION, Hsinchu Science Park, TW;
Abstract
A chip system comprising ROM code including a bootloader which runs whenever the chip is powered on; and programmable fuse array memory storing version identifiers, NVMs in which copies of a version of bootable firmware are stored, wherein a first identifier is stored including active major number and minor numbers, signed with a private key; wherein a second identifier is stored including recovery major and minor numbers, signed with said private key; and hardware which obeys a first command by the boot ROM code to disable until next system reset, writing to the recovery NVM other than to the bootloader, and obeys a second command, to lift write protection of the recovery NVM, wherein firmware images associated with both said versions, and both said identifiers, are signed with said private key, and the boot ROM code authenticates firmware image/s and said identifiers.