CN102053875A - Method for recovering basic input and output system of computer system and computer system - Google Patents

Abstract

A method for recovering a basic input output system of a computer system and the computer system are provided. The computer system comprises a main control unit, a control unit and a first storage device. The control unit is used for controlling a system power supply provided to the main control unit. The main control unit carries out a starting initial program by accessing the BIOS code in the first storage device. The method comprises the following steps: when the computer system has a recovery requirement, the system power supply is closed; rewriting the backup BIOS code into the first storage device; and starting the system power supply to enable the main control unit to access the rewritten BIOS code in the first storage device so as to carry out a starting initial program.

Description

Method for recovering basic input output system of computer system and computer system

technical field

The present invention relates to a method for recovering a basic input and output system of a computer system and its related computer system, in particular to a method capable of controlling the recovery program through a control unit and its related computer system.

Background technique

The Basic Input/Output System (BIOS) plays a very critical role in the boot process of the computer system. Generally speaking, after the user presses the power-on button, until the computer system loads and executes an operating system (Operating System, OS), the BIOS will perform many procedures successively to realize the boot-up procedure. For example, boot self-test, initialization actions, recording system settings, providing resident program libraries, assisting in loading the operating system, etc. are all functions provided by the BIOS. Therefore, in the booting process, each hardware of the computer system is initialized and tested through the BIOS, and the operating system is assisted to start, which will ensure that the system can work normally. In actual operation, the BIOS code (BIOS code) is usually stored in a storage device. When the computer system supplies the system power required by a central processing unit, the central processing unit will access and execute the BIOS code in the storage device. , to start the computer system boot process.

However, if the BIOS code in the storage device is damaged or the data is incomplete, the computer system cannot be started smoothly. In this case, in order to avoid the failure of the computer system due to BIOS damage, the known technology utilizes multiple sets of storage devices to store multiple backup BIOS codes, and sets the priority order. When encountering the aforementioned problems, they will be changed sequentially. to other group storage devices to solve the dilemma when there is only a single group of BIOS. However, although the aforementioned method can immediately solve the problem of not being able to start the device, it also consumes too much manufacturing cost and becomes impractical. Therefore, the known technology proposes another solution. Please refer to FIG. 1 , which is a schematic diagram of a known computer system 10 . As shown in FIG. 1 , the computer system 10 includes a main control unit 102 , a primary storage device 104 and a backup storage device 106 . The main storage device 104 is used to store the BIOS code, and the backup storage device 106 is used to store the checking program (or burning program) and the backup BIOS code. When the system is turned on, the main control unit 102 will first access the check program in the backup storage device 106 and execute the check program to check whether the BIOS code in the main storage device 104 is damaged. If no damage occurs, the main control unit 102 will further access and execute the BIOS code to perform a boot procedure. If there is a damage situation, the backup BIOS code in the backup storage device 106 is copied to the main storage device 104, and then the main control unit 102 accesses and executes the copied BIOS code to perform a boot procedure. This double BIOS method needs to use a storage space that can store more than twice the size of the BIOS code to achieve the purpose of backup BIOS. However, once the inspection program in the backup storage device 106 is damaged, the main control unit 102 will not be able to complete the inspection task, so that the booting process is interrupted and the booting process cannot be completed.

Contents of the invention

Therefore, the present invention is mainly to provide a method for recovering a basic input/output system (Basic Input/Output System, BIOS) of a computer system and a related computer system.

The invention discloses a method for restoring the BIOS of a computer system. The computer system includes a main control unit, a control unit and a first storage device. The control unit is used to control the system power supplied to the main control unit. The main control unit passes through the first data transmission unit. The BIOS code in the first storage device is accessed to carry out the booting initial program, and the method includes: when the computer system has a recovery requirement, turn off the system power; rewrite the backup BIOS code into the first storage device; and turn on the system power to enable The main control unit is able to access the rewritten BIOS code in the first storage device, so as to perform the booting initial procedure.

The present invention also discloses a computer system, which includes a first storage device for storing BIOS codes; a second storage device for storing control codes and backup BIOS codes; the main control unit is coupled to the second storage device via the first data transmission unit A storage device is used to access the BIOS code to perform the boot initial program; and the control unit is coupled to the main control unit and is used to control the system power provided to the main control unit according to the control code; wherein, in the computer system, there are When restoring the demand, use the control unit to turn off the system power and rewrite the backup BIOS code into the first storage device, and then turn on the system power, so that the main control unit can access the rewritten BIOS code in the first storage device to start the system initial program.

The invention also discloses a method for restoring the BIOS of a computer system. The computer system includes a main control unit, a control unit and a first storage device. The control unit is used to control the system power supplied to the main control unit. The main control unit transmits the The unit accesses the BIOS code in the first storage device to carry out the booting initial program. The method includes: when the computer system needs to be restored, the control unit is used to turn off the system power; the control unit is used to control the main control unit to access data, and the system is turned on. Power supply; use the main control unit to access the BIOS startup block code stored in the second storage device; use the main control unit to execute the BIOS startup block code to rewrite the backup BIOS code stored in the third storage device to the first storage device; using the control unit to turn off the system power supply; and using the control unit to turn on the system power supply, so that the main control unit can access the rewritten BIOS code in the first storage device through the first data transmission unit to perform the booting initial procedure.

The invention also discloses a computer system, which includes a first storage device for storing BIOS codes; a second storage device for storing control codes and BIOS startup block codes; a third storage device for storing backup BIOS codes ; the main control unit is coupled to the first storage device via the first data transmission unit, and is used to access the BIOS code to perform the boot initialization procedure; and the control unit is coupled to the main control unit, and is used to control the provision of To the system power of the main control unit and read the BIOS startup block code; wherein, when the computer system has recovery needs, use the control unit to access the read BIOS startup block code, and execute the BIOS startup block on the main control unit code, rewrite the backup BIOS code stored in the third storage device to the first storage device, so that the main control unit can access the rewritten BIOS code in the first storage device to perform the booting initial procedure.

Description of drawings

FIG. 1 is a schematic diagram of a known computer system.

FIG. 2 is a schematic diagram of a computer system according to the first embodiment of the present invention.

FIG. 3 is a schematic diagram of a process for recovering the BIOS code of the computer system according to the first embodiment of the present invention.

4 to 8 are schematic diagrams of the computer system in FIG. 2 recovering the BIOS.

FIG. 9 is a schematic diagram of a computer system according to the second embodiment of the present invention.

FIG. 10 is a schematic diagram of a process for recovering the BIOS code of the computer system according to the second embodiment of the present invention.

[Description of main component symbols]

10, 20, 90 Computer systems

102, 202, 902 main control unit

104 main storage device

106 backup storage device

204, 904 control unit

206, 906 The first storage device

208, 908 Second storage device

210, 912 The first data transmission unit

212, 914 Second data transmission unit

214, 916 The third data transmission unit

402 The first toggle switch

404 Second toggle switch

910 The third storage device

918 The fourth data transmission unit

Detailed ways

Please refer to FIG. 2 , which is a schematic diagram of a computer system 20 according to a first embodiment of the present invention. The computer system 20 includes a main control unit 202 , a control unit 204 , a first storage device 206 , a second storage device 208 , a first data transmission unit 210 , a second data transmission unit 212 and a third data transmission unit 214 . Wherein, the first storage device 206 is used to store Basic Input/Output System (BIOS) codes. The second storage device 208 is used to store control codes (eg, embedded control codes or other program codes with similar functions) and backup BIOS codes. During a normal boot process, the main control unit 202 is coupled to the first storage device 206 via the first data transmission unit 210 to access and execute the BIOS code to perform a boot initial procedure. The control unit 204 is coupled to the first storage device 206 , the second storage device 208 and the main control unit 202 via the first data transmission unit 210 , the second data transmission unit 212 and the third data transmission unit 214 respectively. The control unit 204 controls power supplied to each element of the computer system 20 (for example, system power required for the operation of the main control unit 202 ) and controls a procedure for restoring the BIOS code, according to the control code.

Therefore, when the BIOS code in the first storage device 206 is damaged or the data is incomplete, the main control unit 202 cannot successfully execute the BIOS code to perform the booting process. Using the known technique, the error detection and the recovery of the BIOS code must be executed only when the main control unit 202 has power supply. The control unit 204 used in the present invention can automatically detect errors through the control unit 204 when there is no system power supply, or when the computer system has recovery needs, the control unit 204 can be used to turn off the system power to control the recovery program, so as to recover the first A BIOS code in storage device 206 . In this way, the computer system 20 of the present invention can avoid the problem in the traditional method that the booting process is interrupted due to damage to the inspection programs stored in other storage devices. For the detailed operation of the computer system 20 , please continue to refer to the following description.

Please refer to FIG. 3 , which is a schematic diagram of a process 30 for restoring the BIOS code of the computer system 20 according to the first embodiment of the present invention. The process 30 is used to realize an operation process of the above-mentioned computer system 20, which includes the following steps:

Step 300: start.

Step 302 : When the computer system 20 needs to restore the BIOS code, use the control unit 204 to turn off the system power required for the operation of the main control unit 202 .

Step 304 : Rewrite the backup BIOS code into the first storage device 206 by the control unit 204 .

Step 306 : Use the control unit 204 to turn on the system power, so that the main control unit 202 can access the rewritten BIOS code in the first storage device 206 to perform a booting initialization procedure.

Step 308: end.

According to the process 30 , the computer system 20 implements the recovery program of the BIOS code through the control of the control unit 204 . In step 302, after learning that the computer system 20 needs to restore the BIOS code, the control unit 204 will turn off the system power supplied to the main control unit 202, so that the main control unit 202 temporarily stops accessing the first storage device 206 BIOS code, and enter the recovery program. It should be noted that, in the present invention, any method that enables the control unit 204 to determine whether there is a need to recover the BIOS code is applicable to the present invention. For example, after a hot key, a specific key (such as a recovery activation key), a combination key (combination of multiple keys) etc. that can be set on the computer system 20 are pressed by the user, the recovery request is triggered to the control unit 204, then The control unit 204 will shut down the system power supplied to the main control unit 202 according to the triggered recovery requirement. Alternatively, it is also possible to judge whether there is a need for recovery through the routinely executed functions of the control unit 202 . For example, usually in a computer system, a mechanism is designed to report to the control unit 204 that the booting procedure has been completed after the system is successfully booted. In this case, the control unit 204 can detect whether the computer system 20 has a report message within a specific time after the power button is pressed. If there is none, it is regarded as a boot failure. For example, in this embodiment, it can be set that when the number of boot failures counted by the control unit 204 is greater than a specific threshold (for example, 3 times), the control unit 204 will shut down the system power supplied to the main control unit 202, and continue Go to step 304 to step 308 . In addition, the control unit 204 can also detect whether the main control unit 202 of the computer system 20 has a recovery demand through any connection port, such as the status of the No. 80 connection port (port 80). For example, when the control unit 204 When the cumulative number of times of a boot failure message generated by the No. 80 connection port is greater than a threshold value (for example, 5 times), the control unit 204 will turn off the system power and perform a recovery procedure.

In addition, step 304 may include detecting by the control unit 204 whether there is an error in the BIOS code in the first storage device 206, and when it is detected that there is an error in the BIOS code, the control unit 204 then transfers the second storage device 208 to the second storage device 208. The backup BIOS code in the first storage device 206 is rewritten. Preferably, when it is detected that there is no error in the BIOS code, the process of rewriting the backup BIOS code into the first storage device 206 is not required, and the process directly jumps to step 308 . On the other hand, the control unit 204 can use any data error detection method to detect whether there is an error in the BIOS code. For example, the control unit 204 can perform a checksum (checksum), Parity check (parity check) or cyclic redundancy check (cyclic redundancy check) program to detect errors in BIOS codes.

In step 306, since the control unit 204 has rewritten the backup BIOS code into the first storage device 206, the system power supply to the main control unit 202 is turned on again under the control of the control unit 204, so that the main control unit 202 will be able to continue to access the rewritten BIOS code in the first storage device 206, and carry out the boot initial procedure smoothly.

Please refer to FIG. 4 and FIG. 5 . FIG. 4 and FIG. 5 are schematic diagrams of restoring the BIOS of the computer system 20 in FIG. 2 . As shown in FIG. 4 , when the control unit 204 learns that there is a need to restore the BIOS code, it will first shut down the system power provided to the main control unit 202, so that the main control unit 202 temporarily stops accessing the first storage device 206. BIOS code. Next, the control unit 204 detects the BIOS code stored in the first storage device 206 by switching the first data transmission unit 210 . When an error is detected in the BIOS code, the control unit 204 can read the backup BIOS code stored in the second storage device 208 via the second data transmission unit 212 . Further, the control unit 204 transmits the read backup BIOS code to the first storage device 206 via the first data transmission unit 210 and rewrites the read backup BIOS code to the first storage device 206 . In this case, the first storage device 206 already stores the complete BIOS code. Therefore, as shown in FIG. 5 , the control unit 204 switches the first data transmission unit 210 to restore the system power supplied to the main control unit 202, then the main control unit 202 can access and execute the restored After the BIOS code, and successfully implement the boot process.

Please refer to FIG. 6 to FIG. 8 , which provide detailed implementations when the control unit 204 cannot provide enough input and output ports. FIG. 6 to FIG. 8 are another schematic diagrams of the computer system 20 in FIG. 2 recovering the BIOS. As shown in FIG. 6 , when the control unit 204 learns that there is a need to restore the BIOS code, it first shuts down the system power provided to the main control unit 202 . Next, the control unit 204 can detect the BIOS code stored in the first storage device 206 by switching the first data transmission unit 210 and the second data transmission unit 212 . When an error is detected in the BIOS code, as shown in FIG. 7 , the control unit 204 reads the backup BIOS code stored in the second storage device 206 by switching the second data transmission unit 212 . Further, as shown in FIG. 8, the control unit 204 transmits the read backup BIOS code to the first storage device via the first data transmission unit 210 and the second data transmission unit 212 by switching the second data transmission unit 212. 206 and rewrite the read backup BIOS code to the first storage device 206. In this case, the first storage device 206 already stores the complete BIOS code. Therefore, as shown in FIG. 5, the control unit 204 restores the system power supplied to the main control unit 202 by switching the first data transmission unit 210, and the main control unit 202 can access and execute the After recovering the BIOS code, the boot procedure can be successfully realized.

Preferably, as shown in FIG. 4 to FIG. 8, the first data transmission unit 210 includes a first switch 402, and the first switch 402 can be selectively coupled to the main control unit 202, the control unit 204 or the second data transmission unit. Transmission unit 212. The second data transmission unit 212 includes a second switch 404 , and the second switch 404 is selectively coupled to the first data transmission unit 210 or the second storage device 208 . It should be noted that the switches 402 and 404 can be transistors or other components that can achieve the same function.

Please refer to FIG. 9 , which is a schematic diagram of a computer system 90 according to a second embodiment of the present invention. It is worth noting that since the computer system 20 of FIG. 2 and the components with the same name in the computer system 90 of FIG. The connection relationship is shown in FIG. 9 , and will not be repeated here. The computer system 90 includes a main control unit 902, a control unit 904, a first storage device 906, a second storage device 908, a third storage device 910, a first data transmission unit 912, a second data transmission unit 914, and a third data transmission unit 916 and a fourth data transmission unit 918 . Wherein the difference from Fig. 2 is that the second storage device 908 is used to store the control code and the BIOS startup block code (boot block code), the third storage device 910 is used to store the backup BIOS code, and the main control unit 902 can pass through the first The four data transmission unit 918 accesses the backup BIOS code. Preferably, the third storage device 910 is an external storage device. When there is a need for BIOS recovery, the computer system 90 uses the control unit 904 to control the pins of the main control unit 902, such as setting pins (strap pins), but the present invention is not limited thereto, and other devices with the same effect can also be used. The software and hardware are designed so that the main control unit 902 accesses and executes the BIOS startup block code read by the control unit 904 from the second storage device 908 through the second data transmission unit 914 . In this case, the main control unit 902 rewrites the backup BIOS code stored in the third storage device 910 into the first storage device 906 according to the BIOS startup block code, and completes the BIOS recovery procedure. For the detailed operation of the computer system 90, please continue to refer to the following description.

Please refer to FIG. 10 , which is a schematic diagram of a process 100 for restoring the BIOS code of the computer system 90 according to the second embodiment of the present invention. The process 100 is used to realize the operation process of the above-mentioned computer system 90, which includes the following steps:

Step 1000: start.

Step 1002: Use the control unit 904 to turn off the system power required for the operation of the main control unit 902 when the computer system 90 needs recovery.

Step 1004: Use the control unit 904 to control the main control unit 902 to access data, and turn on the system power.

Step 1006: Utilize the main control unit 902 to access the BIOS boot block code stored in the second storage device 908 .

Step 1008 : Use the main control unit 902 to execute the BIOS startup block code to rewrite the backup BIOS code stored in the third storage device 910 to the first storage device 906 .

Step 1010: Use the control unit 904 to turn off the system power.

Step 1012: Use the control unit 904 to turn on the system power, so that the main control unit 902 can access the rewritten BIOS code in the first storage device 906 through the first data transmission unit 912, so as to perform a booting initialization procedure.

Step 1014: end.

To further illustrate, in step 1002, when there is a need for recovery, the computer system 90 uses the control unit 904 to turn off the system power required for the operation of the main control unit 902, so that the main control unit 902 temporarily stops accessing the BIOS of the first storage device 906 code. By controlling the setting pin, the main control unit 902 can access external data via the first data transmission unit 912 or via the second data transmission unit 914. In step 1004, the control unit 904 will pass the setting pin, and then turn on the The system power of the control unit 902. In this case, the main control unit 902 will access the data provided by the control unit 904 via the second data transmission unit 914 . In step 1006, the main control unit 902 can be used to send an access request to the control unit 904 through the third data transmission unit 916, and then, the control unit 904 reads the BIOS boot area from the second storage device 908 according to the access request After the block code, the main control unit 902 accesses the BIOS startup block code read by the control unit 904 through the third data transmission unit 916 . In step 1008, the main control unit 902 executes the BIOS startup block code after accessing the BIOS startup block code, so as to read the backup BIOS code stored in the third storage device 910 through the fourth data transmission unit 918 , and rewrite the read backup BIOS code to the first storage device 906 via the first data transmission unit 912 . In step 1010 , the control unit 904 will turn off the system power, and once again pass the setting pin to enable the main control unit 902 to access the BIOS code of the first storage device 906 via the first data transmission unit 912 . Finally, in step 1012, the system power of the main control unit 902 is restored, so that the main control unit 902 can perform a booting initial procedure. Therefore, compared with the prior art, the present invention can use the control unit 904 to control the recovery program when the computer system needs recovery, without interrupting the boot process due to the damage of the checking program. For the computer system, it only needs to use a smaller storage space to store the BIOS startup block code to complete the recovery procedure.

It should be noted that the computer system 20 and the computer system 90 are embodiments of the present invention, and those skilled in the art may make various changes accordingly. The main control unit 202, 902 is a central processing unit, a chipset (south bridge chip, north bridge chip) or a combination thereof, but the present invention is not limited thereto. The control units 204, 904 are embedded controllers (embedded controllers), microprocessors (Microprocessors), I/O controllers (I/O controllers) or any components with similar functions. Any device that can store data can be used to implement the storage unit mentioned in the embodiments of the present invention, such as ROM, electronically erasable ROM, flash memory, non-volatile memory and so on. The data transmission unit mentioned in the embodiment of the present invention can be any device used to transmit data, for example, the first data transmission unit 912 or the second data transmission unit 914 can be a serial peripheral bus interface (Serial Peripheral Interface , SPI), the third data transmission unit 916 can be an LPC bus interface (Low Pin Count, LPC), and the fourth data transmission unit 918 can be a universal serial bus interface (Universal Serial Bus, USB), but not limited thereto . In addition, the hot keys described in the present invention include one or more keys, for example, the function key Fn, the letter J key, and the switch key can be set as preset hot keys, when the three keys are simultaneously A recovery demand is triggered when pressed. In addition, the specific keys mentioned in the present invention are not limited to a particular type, and include existing or additional physical keys of the computer system, in other words, as long as they can be connected with the control unit and managed by it to supply power equipment.

In summary, compared with the known technology. The present invention does not need to check the status of the BIOS code when the computer system is turned on, but can use the control unit to control the recovery program when the computer system needs recovery, so that the boot process will not be interrupted due to the damage of the checking program. On the other hand, the present invention only needs to use a small storage space to store the BIOS startup block code to complete the recovery procedure, which can greatly reduce the manufacturing cost.

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the claims of the present invention shall fall within the scope of the present invention.

Claims (29)

1. A method of recovering a basic input output system of a computer system comprising a main control unit, a control unit and a first storage device, the control unit being used to control a system provided to the main control unit Power supply, the main control unit accesses a BIOS code in the first storage device through a first data transmission unit to perform a startup initialization procedure, the method includes: When the computer system needs to be restored, turn off the power of the system; rewrite a backup BIOS code into the first storage device; and Turning on the power of the system enables the main control unit to access the rewritten BIOS code in the first storage device, so as to perform a booting initial procedure. 2. The method according to claim 1, wherein when the computer system has a recovery requirement, the step of turning off the system power comprises: When at least one hot key, a specific key or a combined key of the computer system is pressed, or when the control unit detects that the number of boot failures of the computer system is greater than a threshold value, the system power is turned off. 3. The method according to claim 1, wherein the step of rewriting the backup BIOS code into the first storage device comprises: detecting the BIOS code in the first storage device; and When an error is detected in the BIOS code, the backup BIOS code is rewritten into the first storage device. 4. The method according to claim 3, wherein the step of detecting the BIOS code in the first storage device comprises: switch the first data transmission unit to connect the first storage device and the control unit; and The BIOS code stored in the first storage device is detected by the control unit. 5. The method according to claim 3, wherein when an error is detected in the BIOS code, the step of rewriting the backup BIOS code into the first storage device comprises: When an error is detected in the BIOS code, read the backup BIOS code stored in a second storage device via a second data transmission unit; and The read backup BIOS code is rewritten to the first storage device via the first data transmission unit. 6. The method as claimed in claim 3, wherein the step of detecting the BIOS code in the first storage device comprises: switching the first data transmission unit and a second data transmission unit to connect the first storage device and the control unit through the first data transmission unit and the second data transmission unit; and The BIOS code stored in the first storage device is detected by the control unit. 7. The method according to claim 6, wherein when an error is detected in the BIOS code, the step of rewriting the backup BIOS code to the first storage device comprises: When an error is detected in the BIOS code, switch the second data transmission unit so that the control unit reads the backup BIOS code stored in a second storage device via the second data transmission unit; switching the second data transmission unit, so that the control unit rewrites the backup BIOS code to the first storage device via the first data transmission unit and the second data transmission unit; and The first data transmission unit is switched to connect the first storage device with the main control unit, and the second data transmission unit is switched to connect the second storage device with the control unit. 8. The method as claimed in claim 3, wherein the step of detecting the BIOS code stored in the first storage device comprises: A checksum program, a parity check program or a cyclic redundancy check program is executed on the BIOS code to detect whether there is an error in the BIOS code. 9. A computer system comprising: A first storage device, used to store a BIOS code; A second storage device, used to store a control code and a backup BIOS code; a main control unit, coupled to the first storage device via a first data transmission unit, for accessing the BIOS code to perform a boot initialization procedure; and a control unit, coupled to the main control unit, for controlling a system power supply provided to the main control unit according to the control code; Wherein, when the computer system needs recovery, the control unit turns off the system power and rewrites the backup BIOS code into the first storage device, and then turns on the system power so that the main control unit can access the first storage device. The rewritten BIOS code in the storage device is used to carry out the boot initial program. 10. The computer system as claimed in claim 9, comprising at least one hotkey, a specific key or a combination of keys, wherein when the at least one hotkey, the specific key or the combination of keys is pressed, a recovery requirement is triggered , causing the control unit to shut down the system power supply according to the recovery requirement. 11. The computer system as claimed in claim 9, wherein when the control unit detects that the number of boot failures of the computer system is greater than a threshold value, the control unit turns off the system power supplied to the main control unit. 12. The computer system according to claim 9, wherein the control unit switches a second data transmission unit after the system power is turned off, so as to read the backup BIOS code through the second data transmission unit, and switch the second data transmission unit. A data transmission unit, for rewriting the read backup BIOS code to the first storage device via the first data transmission unit. 13. The computer system according to claim 12, wherein after the system power is turned off, the control unit first switches the first data transmission unit to detect the data stored in the first storage device through the first data transmission unit. The BIOS code, when the control unit detects an error in the BIOS code, the control unit reads the backup BIOS code and rewrites the backup BIOS code into the first storage device. 14. The computer system according to claim 12, wherein the control unit switches the first data transmission unit to connect the first storage device and the main storage device after rewriting the backup BIOS code into the first storage device control unit, and turn on the system power. 15. The computer system of claim 9, wherein the first data transfer unit further comprises: A first switch selectively coupled to the main control unit, the control unit or the second data transmission unit. 16. The computer system according to claim 9, wherein the control unit switches a second data transmission unit after the system power is turned off, so as to read the data stored in the second storage device through the second data transmission unit. backup BIOS code, and switch the first data transmission unit and the second data transmission unit, so as to rewrite the read backup BIOS code to the second data transmission unit via the first data transmission unit and the second data transmission unit a storage device. 17. The computer system according to claim 16, wherein the control unit first switches the first data transmission unit and the second data transmission unit after turning off the system power, so as to pass the first data transmission unit and the second data transmission unit The second data transmission unit detects the BIOS code stored in the first storage device. When the control unit detects that there is an error in the BIOS code, the control unit switches the second data transmission unit to pass the second data. The transmission unit reads the backup BIOS code stored in the second storage device, and switches the second data transmission unit to transfer the read backup BIOS code via the first data transmission unit and the second data transmission unit. rewrite to the first storage device. 18. The computer system according to claim 17, wherein the control unit switches the first data transmission unit to connect the first storage device and the main storage device after rewriting the backup BIOS code into the first storage device control unit, and turn on the system power. 19. The computer system of claim 9, wherein the second data transmission unit further comprises: A second switch selectively coupled to the first data transmission unit or the second storage device. 20. The computer system as claimed in claim 9, wherein the control unit executes a checksum program, a parity check program or a cyclic redundancy check program to the BIOS code to detect whether there is an error in the BIOS code . 21. A method of recovering a basic input output system of a computer system comprising a main control unit, a control unit and a first storage device, the control unit being used to control a system provided to the main control unit Power supply, the main control unit accesses a BIOS code in the first storage device through a first data transmission unit to perform a startup initialization procedure, the method includes: When the computer system needs to be restored, using the control unit to turn off the power supply of the system; using the control unit to control the main control unit to access data, and turn on the system power; using the main control unit to access a BIOS startup block code stored in a second storage device; using the main control unit to execute the BIOS boot block code to rewrite a backup BIOS code stored in a third storage device to the first storage device; using the control unit to power down the system; and The system power is turned on by the control unit, so that the main control unit can access the rewritten BIOS code in the first storage device through the first data transmission unit, so as to perform a startup initialization procedure. 22. The method as claimed in claim 21, wherein when the computer system has a recovery requirement, the step of using the control unit to turn off the system power comprises: When at least one hot key, a specific key or a key combination of the computer system is pressed, or when the control unit detects that the number of boot failures of the computer system is greater than a threshold value, using the control unit to shut down the system power supply. 23. The method as claimed in claim 21, wherein the step of using the main control unit to access the BIOS boot block code stored in the second storage device comprises: using the main control unit to send an access request to the control unit; The control unit reads the BIOS startup block code from the second storage device according to the access request; and The main control unit is used to access the BIOS startup block code read by the control unit. 24. The method according to claim 21, wherein the main control unit is used to execute the BIOS boot block code to rewrite the backup BIOS code stored in the third storage device to the first storage device ,Include: The main control unit is used to execute the BIOS startup block code to read the backup BIOS code stored in the third storage device, and rewrite the read backup BIOS code to the first storage device. 25. A computer system comprising: A first storage device, used to store a BIOS code; A second storage device, used to store a control code and a BIOS startup block code; A third storage device, used to store a backup BIOS code; a main control unit, coupled to the first storage device via a first data transmission unit, for accessing the BIOS code to perform a boot initialization procedure; and A control unit, coupled to the second main control unit, is used to control a system power supplied to the main control unit and read the BIOS startup block code according to the control code; Wherein, when the computer system has recovery requirements, the control unit accesses the read BIOS startup block code, and when the main control unit executes the BIOS startup block code, the The backup BIOS code is rewritten into the first storage device, so that the main control unit can access the rewritten BIOS code in the first storage device to perform a booting initialization procedure. 26. The computer system according to claim 25, wherein the control unit shuts down the system power supply when the computer system needs to be restored, and controls the main control unit to enable the main control unit to access data, and then turns on the system power supply . 27. The computer system as claimed in claim 25, wherein when the backup BIOS code is rewritten to the first storage device, the control unit turns off the system power, and controls the main control unit so that the main control unit The data is accessed through the first data transmission unit, and then the system power is turned on, so as to perform a booting initial procedure. 28. The computer system as claimed in claim 25, comprising at least one hot key, a specific key or a combination of keys, wherein when the at least one hot key, the specific key or the combination of keys is pressed, a recovery requirement is triggered , causing the control unit to shut down the system power supply according to the recovery requirement. 29 . The computer system as claimed in claim 25 , wherein when the control unit detects that the number of boot failures of the computer system is greater than a threshold value, the control unit turns off the system power supplied to the main control unit.

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