Computer system and electronic apparatus having secure boot mechanism and operation status restoring method thereof

A computer system, comprising:

• a host terminal;
• and
• an electronic apparatus having a secure boot mechanism electrically coupled to the host terminal and comprising:
• a storage circuit;
• and
• a processing circuit electrically coupled to the storage circuit, the processing circuit configured to:
• store operation-related data in the storage circuit under a normal operation mode of the electronic apparatus;
• store the operation-related data in the host terminal;
• calculate a first hash value according to the operation-related data and store the first hash value in a non-power-off area of the storage circuit;
• maintain a power of the non-power-off area to be turned on and turn off the power of a power-off area when the electronic apparatus is switched to be under a lower power operation mode;
• restore the power of the power-off area and retrieve the operation-related data from the host terminal to the storage circuit to calculate a second hash value accordingly when the electronic apparatus is switched back to be under the normal operation mode;
• and
• compare the first hash value and the second hash value such that the operation-related data is determined to be valid and the electronic apparatus operates according to the retrieved operation-related data when the first hash value and the second hash value are matched, and the operation-related data is determined to be invalid and the electronic apparatus stops to operate when the first hash value and the second hash value are not matched.

An operation status restoring method having a secure boot mechanism used in an electronic apparatus electrically coupled to a host terminal, the operation status restoring method comprising:

• storing operation-related data in a storage circuit under a normal operation mode of the electronic apparatus by a processing circuit;
• storing operation-related data in the host terminal by the processing circuit;
• calculating a first hash value according to the operation-related data and storing the first hash value in a non-power-off area of the storage circuit by the processing circuit;
• maintaining a power of the non-power-off area to be turned on and turning off the power of a power-off area when the electronic apparatus is switched to be under a lower power operation mode by the processing circuit;
• restoring the power of the power-off area and retrieving the operation-related data from the host terminal to the storage circuit to calculate a second hash value accordingly when the electronic apparatus is switched back to be under the normal operation mode by the processing circuit;
• and
• comparing the first hash value and the second hash value by the processing circuit such that the operation-related data is determined to be valid and the electronic apparatus operates according to the retrieved operation-related data when the first hash value and the second hash value are matched, and the operation-related data is determined to be invalid and the electronic apparatus stops to operate when the first hash value and the second hash value are not matched.