JPH04360219A - Information processor - Google Patents

Abstract

PURPOSE:To prevent the generation of an error and to make the operation of this information processor automatically coincide with a set point by preserving again an initial value corresponding to an item concerned in a memory at the time of detecting an undefined value in the memory. CONSTITUTION:The data of one byte stored in the contents 21 of a memory switch SSW 2 are extracted. Then the value of an SI/SO control parameter 41, an unused bit group 42 and the value of a communication speed parameter 41 are successively extracted. Since the value of the parameter 43 exceeds a range indicated by the communication speed and the range 54 of parameter values, the value is judged as an undefined value and the repairing work of parameter data is executed. The initializing point 61 of the SW 2 is extracted from the initial value table of the SSW 2 and only the initializing parameter value 62 of the communication speed is extracted from the extracted value 61 and combined with other data of the SSW 2 to form the data of the SSW 2. A repaired value is registered again in a parameter preserving memory as the value of the SSW 2.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to means for maintaining parameters in an information processing apparatus having a function of storing parameters for controlling external devices in a memory element.

0002

[Background Art] Conventionally, a memory element (hereinafter referred to as memory)
If a value is stored that is not defined as a parameter for external device control, it will not be detected and repaired, and an error may occur due to parameter abnormality during operation, or the setting value may be changed. A different operation was performed on the device.

0003

SUMMARY OF THE INVENTION An object of the present invention is to provide a function that prevents the occurrence of the above-mentioned errors and automatically matches the set value with the operation of the device.

0004

[Means for Solving the Problems] The present invention provides an information processing device having a function that requires setting parameters in order to operate an external device. The present invention is characterized by comprising means for checking whether the saved contents are correct, and means for automatically restoring the contents if the stored contents are incorrect at the time of the checking.

[0005]

[Operation] In the automatic repair of the present invention, when an undefined value is detected in the memory, the initial value for the corresponding item is saved in the memory again to eliminate the error.

[0006]

Embodiment An embodiment of automatic repair of the present invention will be described. Figure 1 shows
1 shows a block diagram of an information processing device according to the present invention. 11 is a read-only memory that stores the BIOS program; 12
13 is a memory for saving external device parameters (hereinafter referred to as a memory switch), 13 is an external device controller, and C
These are controlled by PU19.

When the information processing apparatus according to the present invention is turned on, it reads a BIOS program from the memory 11, initializes the hardware and memory according to the boot routine of this program, and then starts the system. The automatic repair process of the present invention is performed during the initialization process.

FIG. 2 shows an overview of a memory switch. FIG. 3 shows the flow of automatic parameter restoration processing according to the present invention, and exemplifies the SI/SO (shift-in/shift-out) control parameters for operating a communication device and the memory switch SSW2 (21) having a communication speed. , describes data determination and its repair.

First, 1 byte of data stored in the memory switch SSW2 (21) is retrieved (31). FIG. 4 shows the contents of the memory switch taken out at this time, where the value 41 represents the SI/SO control and the value 43 represents the communication speed. Further, 42 is an unused bit. Whether or not this retrieved value is defined is determined by comparing the values based on the relationship between the memory switch SSW2 and the parameter values shown in FIG. Values 51, 52, and 54 are present in the BIOS program stored in memory 11.

The value 41 representing SI/SO control is masked and extracted (32). This value is as shown by 51”
Since it is within the range of "0" or "1" (33) and is determined to be a defined value (34), the parameter data is not changed.At this point, there is other data, so (38) , proceed to the next parameter check.

Next, the unused bit group (42) is masked and extracted (32). Since these values are always kept at 0 (52, 33), in this case it is determined that they are defined (34), and the process proceeds to the next parameter check (38). Next, the value 43 representing the communication speed is masked and extracted (32). This value is 54
Since the value exceeds the range shown in (33), it is determined that the value is undefined (34), and the parameter data is repaired.

The initial setting value (61) of SSW2 is extracted from the initial value table of the memory switch shown in FIG.
5) Then, only the initial setting parameter value (62) of the communication speed is extracted from this (36) and combined with other data of SSW2 (37) to become the data of SSW2, and the repair work is completed. The initial setting value table for the memory switch is
It exists in the BIOS program. Since there is no other data to check (38), the data check of SSW2 ends here. The results of the above determination and repair are as shown in 71, 72, and 73 shown in FIG. This restored value is re-registered in memory 12 as the value of memory switch SSW2 (39).

Similar processing is performed on all other memory switches to check whether the parameters are correct.

[0014] The present invention has been made clear by the above explanation of the operation, but whereas in the past various errors and malfunctions occurred due to the use of incorrect parameters, the present invention completely eliminates these errors. can now be prevented.

[0015]

According to the present invention, there are no undefined parameters in the memory, so there is no longer a need for application software to determine whether a parameter is valid or invalid in order to operate an external device.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an information processing device.

FIG. 2 is a schematic diagram of a memory switch.

FIG. 3 is a flowchart showing the flow of data determination and restoration processing.

FIG. 4 is a diagram showing memory contents when performing a check.

FIG. 5 is a diagram showing the relationship between communication speed and parameter values.

FIG. 6 is a diagram showing an initial value table.

FIG. 7 is a diagram showing the contents of memory after restoration.

[Explanation of symbols]

11...Program ROM 12...Parameter storage memory 13...Controller for external device 19...
CPU 21... Contents of SSW2 41, 71... SI/SO control parameters 42,
72... Unused bit group 43, 73... Communication speed parameter 51...
SI/SO control and parameters 52 ... Unused bit values 54 ... Communication speed and parameter value ranges 61
... Initial value of SSW2

Claims (1)

[Claims] 1. An information processing device having a function that requires setting parameters in order to operate an external device, comprising means for storing parameters of the various functions in a storage element, and checking whether the stored contents are correct. An information processing device characterized by comprising: means for checking when power is turned on; and means for automatically repairing when the checking is incorrect.