Basic output and input system for self verification of selection read only memory and verification method thereof

Abstract

The invention discloses a basic output and input system for the self verification of a selection read only memory and a verification method thereof. The basic output and input system is loaded to a main memory for executing the starting-up operation. The basic output and input system comprises a device firmware block, a verification code block and a starting-up management block, wherein the device firmware block records application device firmware, the verification code block records a verification code, and the starting-up management block executes the verification operation. The method comprises the following steps: starting to execute starting-up program by the basic output and input system; reading the verification code recorded in the basic output and input system; calculating the application device firmware mapped into the section read only memory block of the main memory according to an algorithm to generate a check value; judging whether the read verification code is the same as the calculated check code or not; and continuously executing the starting-up program if the read verification code is the same as the calculated check code. The invention can easily and effectivelymanage various device firmware versions integrated in the basic output and input system, can avoid the risk of hardware equipment damage caused after parameters in the firmware are interpolated, and is favorable for maintaining the stability of the integrative basic output and input system.

Description

technical field [0001] The present invention relates to a basic input / output system for self-verifying selective read-only memory and its verification method, in particular to a basic input-output system for checking the data integrity of selective read-only memory and its verification method. Background technique [0002] For a long time, the basic input and output system is responsible for the preparation work such as power-on self-test (POST), initialization of basic hardware devices, and loading of the operating system during the boot process of the computer system. The division of labor of manufacturers is becoming more and more refined. Manufacturers of basic input and output systems on motherboards often receive firmware for specific hardware devices provided by different hardware device manufacturers, that is, the firmware mapped in the main memory when booting. Select the data of the read-only memory (Option ROM, OPROM) and embed it in the basic input and output sys...

AI Technical Summary

Problems solved by technology

[0003] However, due to the different development process of each manufacturer, BIOS manufacturers often receive too many firmware data of different devices and different versions of hardware devices, and version management is not easy. The I / O system is integrated, but in fact, the second version of the firmware is integrated with the basic I / O system, resulting in inconsistencies, resulting in failure to load or read the correct firmware to set the hardware device smoothly when starting up

[0004] In addition, since manufacturers often place the firmware update files developed on public web pages for users to download, it often happens that after users download and modify the file content, they are placed on the public web pages again, allowing other users to download and be downloaded. After the error file has been tampered with, installing the error file to the computer system will not only fail to improve the performance of the hardware device, but will cause failure to boot or even damage the hardware

[0005] In order to avoid the above-mentioned version inconsistency or the firmware file being changed, resulting in the failure to start the system smoothly and reduce the stability of the system, it is necessary to design a method that can verify the correctness of the selected ROM to ensure that the computer system can be connected to the correct one when it is started. Hardware device firmware operation

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