Data processing device

A data processing device comprising:

• a first controller that requires a first activation time from when operation power is fed to the first controller for completing activation of the first controller;
• a second controller that requires a second activation time from when operation power is fed to the second controller for completing activation of the second controller, the second activation time being shorter than the first activation time;
• and
• a data processor that switches a mode in which data is processed between a first processing mode wherein processing results are outputted without collaboration with the first controller and a second processing mode wherein processing results are outputted in collaboration with the first controller;
• wherein operation power is fed to the second controller before operation power is fed to the first controller;
• wherein activation of the second controller is completed before activation of the first controller is completed;
• wherein the data processor processes data in the first processing mode after activation of the second controller is completed and before activation of the first controller is completed;
• wherein the data processor processes data in the second processing mode after activation of the first controller is completed;
• wherein the data processor processes data in the first processing mode in response to a fault occurring in the first controller;
• wherein the activation of the first controller includes a first booting process carried out by the first controller in which the first controller reads out a program or an operating system, the activation of the first controller being completed once the first controller finishes reading out the program or the operating system;
• wherein the activation of the second controller includes a second booting process carried out by the second controller in which the second controller reads out a program or an operating system, the activation of the second controller being completed once the second controller finishes reading out the program or the operating system;
• wherein the activation of the second controller is initiated before the first controller starts the activation of the first controller;
• and
• wherein the activation of the second controller is finished before the first controller completes the activation of the first controller.