Data processing apparatus and validity verification method

A method for executing a validity verification process on a plurality of target verification data stored in a plurality of storage areas of an auxiliary storage device of a data processing apparatus that includes a ROM (Read Only Memory) and an execution unit, the method comprising the steps of:

• designating one of the plural target verification data in accordance with an order of priority assigned to the plural target verification data;
• and
• executing, by way of the execution unit, the validity verification process on the designated one of the plural target verification data;
• wherein the executing of the validity verification process includes determining whether the designated one of the plural target verification data is valid,
• wherein the executing of the validity verification process is repeated until the designated one of the plural target verification data is determined to be valid,
• wherein the plural target verification data includes superordinate target verification data and subordinate target verification data having the order of priority that is lower than the order of priority of the superordinate target verification data,
• wherein the subordinate target verification data does not include a target verification data having the highest order of priority among the plural target verification data,
• wherein the auxiliary storage device is configured to have a recovery program of the superordinate target verification data stored in at least one of the subordinate target verification data,
• wherein the ROM and the execution unit constitute a configuration of a SoC (System-on-a-Chip) or a configuration of a ASIC (Application Specific Integrated Circuit).