JPH0782460B2 - How to check the recording medium - Google Patents

Description

The present invention relates to a recording medium check method for checking whether or not a plurality of recording media mounted on a single device or substrate are normal.

[Prior Art] Conventionally, for example, a ROM (read only m) installed in various devices.
emory) As a check method to determine whether the chip is appropriate, when the ROM chip is created in advance, each data in the ROM is added and calculated in byte units, or the value obtained by the operation such as exclusive OR is specified. The value (hereinafter referred to as the hash value) is set so that it can be used when the device is turned on.
A predetermined operation is performed on the data for the ROM chip, and whether the ROM is normal or not is determined based on whether the operation value matches the prestored hash value.

By the way, with the development of the integration technology, many control operations are often executed by software, so that the number of steps of the program and the data capacity stored in the program ROM becomes large. Is starting to store.

When the programs and the like are separately installed in a plurality of ROMs, there are a method of making the hash values of the ROMs the same and a method of making the hash values of the ROMs different.

[Problems to be Solved by the Invention] In practice, although the contents of programs and the like stored in the ROM are different, the external shapes of the ROM chips used are often the same, and therefore, they are erroneously mounted at different positions. Occasionally it will be done.

In such a case, in the first conventional method, since the hash values are the same, they cannot be found at the time of checking, and the abnormality is detected only after starting the program.

Further, according to the second method, the mounting abnormality at the time of checking,
An abnormality such as a ROM abnormality can be detected. In this case, a new ROM
It will be taken by replacing with. However, it is only possible to detect an abnormality, and it is not possible to distinguish between an abnormality in the ROM itself and an abnormality in the mounting position. By replacing the ROM that has been determined to be abnormal with a new ROM, everything is normal. Although it was normal itself, the mounting position was wrong, and the ROM displayed as abnormal was discarded and wasted.

The present invention has been made in view of the above points, and an object of the present invention is to provide a method of checking a recording medium that can detect an abnormality of the recording medium itself and an abnormal mounting position.

[Means for Solving the Problems] In order to solve the problems, the present invention is as follows. That is, in a method of checking a recording medium in which a plurality of recording media exist and whether the recording medium is normal or abnormal, data having different values for each recording medium and stored in the recording medium are stored. The reference value, which is the result of performing the predetermined calculation for
The data stored in the recording medium is stored in advance in a predetermined storage device in association with the mounting position information of each recording medium, and the data stored in the recording medium is checked when checking whether the recording medium is normal or abnormal. If the calculated value that is the result of the execution matches the reference value corresponding to the recording medium stored in advance in the storage device, the recording medium is normal. If the calculated value resulting from the execution does not match the reference value corresponding to the recording medium stored in advance in the storage device, it is further different from the recording medium. It is determined whether or not it matches any one of the reference values stored in advance in the storage device in association with the mounting position information of the other recording medium. Position in which the medium is mounted is determined to be abnormal, when it is determined that matches none were to be determined that the said recording medium is abnormal.

[Operation] In a method for checking a recording medium in which a plurality of recording media exist and whether the recording medium is normal or abnormal, a different value is stored in advance for each recording medium and the value is stored in the recording medium. A reference value, which is the result of performing a predetermined calculation on the stored data, is stored in advance in a predetermined storage device in association with the mounting position information of each recording medium. After that, when checking whether the recording medium is normal or abnormal, first, the predetermined calculation is performed on the data stored in the recording medium. When the calculated value that is the result of this execution matches the reference value corresponding to the recording medium stored in advance in the storage device, it is determined that the recording medium is normal. On the other hand, when the calculated value as the execution result does not match the reference value corresponding to the recording medium stored in advance in the storage device, the following determination is further performed. That is, it is determined whether or not it matches with any of the reference values stored in advance in the storage device in association with mounting position information of another recording medium different from the recording medium. When it is determined that either of them matches, it is determined that the position where the recording medium is mounted is abnormal. On the other hand, when it is determined that none of them match,
It is determined that the recording medium is abnormal.

Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a flow chart showing a check method in an embodiment of the present invention, FIG. 2 is a block diagram showing a device configuration to be checked, and FIG. 3 is a pre-processing for storing a hash value as a comparison reference prior to the check operation. FIG. 4 is a flowchart showing the procedure, and FIG. 4 is an explanatory diagram for explaining the check operation.
FIG. 5 is a schematic diagram showing a display form of check results.

The information processing apparatus to which the checking method according to this embodiment is applied includes a processor (CPU) 1 that executes a processing operation and an initial program loader (IP) as shown in FIG.
L) etc. are stored in the program ROM section 2 having N ROMs 21 to 2N, a working RAM 3 for rewritably storing data during processing, and a floppy disk drive device also used as an external storage device. 4 and a display device 5 for displaying processing results and the like.

A floppy disk loaded in the floppy disk drive device 4 prior to the checking operation according to this embodiment.
The regular hash values A1 to AN of the ROMs 21 to 2N to be mounted at the mounting positions P1 to PN (see FIG. 4) by an external hash value storage device (not shown) are stored in 4a.

The hash value storage device includes a processor (CPU), a program ROM, and a working RAM, and the regular hash values A1 to AN of the ROMs 21 to 2N are stored in a predetermined area E1 on the floppy disk 4a according to the processing procedure of FIG. ~ EN (See Fig. 4)
To store.

That is, when the hash value storage device starts the program, the variable i corresponding to the ROM position Pi is set to the initial value 1 in step 100, the hash value D is set to the initial value 0 in step 101, and the address ADD is set. The initial value x, which is the first address, is set. Next, in step 102, data (for example, 1 byte) at a predetermined address of the ROM 2i mounted in the ROM position Pi is added to the hash value D at that time, and the hash value D after the addition is stored again. . After this addition, it is determined in step 103 whether or not the addition of all data has been completed. If not completed, the address ADD is incremented in step 104 and the process returns to the addition processing in step 102.

On the other hand, when the addition of all data is completed, the step
In step 105, the hash value D at that time is stored in the corresponding memory area Ei of the ROM position Pi on the floppy disk 4a as the comparison reference hash value Ai of the ROM 2i mounted in the ROM position Pi.

Note that as the addition processing, for example, addition processing that modifies 2 ⁸ that ignores the overflowed portion is applied.

When the storage of the hash value Ai of the ROM to be installed in the ROM position Pi is completed in this way, the hash value for the ROM 2N to be installed in the final ROM position PN is calculated in step 106.
It is determined whether or not AN storage is completed. When a positive result is obtained, the program is terminated. When a negative result is obtained, in step 107, the variable i corresponding to the ROM position Pi is incremented and the step is performed. Return to 101.

Thus, in the predetermined areas E1 to EN of the floppy disk 4a, as shown in FIG. 4, the hash values A1 to AN serving as the comparison reference of the ROMs 21 to 2N are stored.

The ROMs 21 to 2N are mounted so that the hash values A1 to AN are different from each other. For example, when there is the same hash value, the correction data is written in the empty memory area so as to be different in advance.

The hash value A1 for the comparison reference stored in this way
The check using the AN is performed, for example, in the initial program loading process stored in the ROM section 2 immediately after the power is turned on. That is, at this timing, when the CPU 1 of the checked device starts the program, the variable i corresponding to the ROM position Pi is set to the initial value 1 in step 200, and the hash value D is set to the initial value 0 in step 201. Address ADD
Is the first address (initial value x). Next, the routine proceeds to step 202, where the data at the predetermined address of the ROM 2i mounted at the ROM position Pi is added to the hash value D at that time, and the hash value D after the addition is stored again. After this addition, it is determined in step 203 whether or not the addition of all data has been completed. If not completed, step 204
The address ADD is incremented by and the process returns to the addition process of step 202.

On the other hand, when the addition of all data is completed, the step
In step 205, it is determined whether or not the hash value D obtained by the calculation matches the comparison reference hash value Ai of the ROM position Pi stored in the floppy disk 4a. If they match, the result is displayed as normal on the display device 5 in step 206, the process proceeds to step 207, the variable i corresponding to the ROM position Pi is incremented, and then the variable i is set to N + 1 in step 214. It is determined whether or not they match (that is, whether or not the determination of all the ROMs 21 to 2N has been completed). If they match, this process ends, and if they do not match, the process returns to step 202.

On the other hand, if they do not match, the process proceeds to step 208 and subsequent steps for determining the type of abnormality. In step 208, the variable j corresponding to the ROM position Pj is set to the initial value 1. After that, the CPU 1 determines whether or not the hash value D calculated in step 209 matches the comparison reference hash value Aj of the ROM position Pj. As a result, if an affirmative result is obtained, it is determined in step 210 that the ROM, which should originally be mounted in the ROM position Pj, is mounted in the ROM position Pi, and then a display indicating that the mounting position is abnormal is displayed on the display device 5.
In step 207, the variable i corresponding to the ROM position Pi is incremented and the process proceeds to step 214.

If a negative result is obtained in step 209 described above, the CPU1
Determines whether the variable j corresponds to the final ROM position PN in step 211. here,
If a negative result is obtained, the variable j is incremented in step 212 and the process returns to step 209. On the other hand, if an affirmative result is obtained in step 211, the calculated hash value D does not match any of the normal hash values A1 to AN. Therefore, the process proceeds to step 213 and the display of the ROM abnormality is displayed on the display device 5. After that, the process proceeds to step 207, the variable i corresponding to the ROM position Pi is incremented, and the process proceeds to step 214.

For example, a specific process of the device in which the ROMs 21 to 25 having hash values 1 to 5 are mounted at the mounting positions P1 to P5 will be described. In this case, by executing the processing of FIG. 3,
Areas E1 to E5 of the floppy disk 4a store 1 to 5 as comparison reference hash values A1 to A5, respectively.

When the predetermined ROMs are mounted without mistaken mounting positions, a positive result is obtained in step 205 for all the ROMs during the check operation, and as shown in FIG. "OK" is displayed for both the items indicating the mounting position error. In this case, it may be possible to immediately shift to the next process (for example, the program loading process which is the original process in the case of IPL) without displaying that all the ROMs are normal.

On the other hand, for example, when an abnormal ROM having a calculated hash value of 8 is mounted on the ROM at the mounting position P2, a positive result is obtained at step 205 for the ROMs at the mounting positions P1 and P3 to P5. Then, a normal display is made in step 206, but a positive result is obtained in step 211 for the ROM at the mounting position P2, and an abnormal display of the ROM itself is made in step 212. Therefore, as shown in FIG. 5 (B), regarding the ROMs 21 and 23 to 25, both the ROM normal display item and the mounting position abnormal display item are "O
"K" is displayed, and for the ROM 22, the ROM normal display item is displayed as "NG".

In addition, the ROM that should be mounted in the mounting position P1 and the mounting position P2
If the ROM to be mounted on the ROM is mounted in the opposite direction, a positive result is obtained at step 209 for the ROMs at the mounting positions P1 and P2, and a mounting position abnormality is displayed at step 210, and the mounting position P3 is displayed. For the ROMs of P5 to P5, a positive result is obtained in step 205 and a normal display is made in step 206.
Therefore, as shown in FIG. 5 (C), regarding the ROMs 23 to 25, both the ROM normal display item and the mounting position abnormal display item are "O".
"K" is displayed, and for ROM21 and 22, "OK" is displayed for the ROM normal display item, but "NG" is displayed for the mounting position error display item.

Therefore, according to the above-described embodiment, since the abnormality of the ROM itself and the abnormality of the mounting position are separately detected and displayed, the abnormality of the ROM itself is not displayed and only the abnormality of the mounting position is displayed. The ROM yield can be improved by enabling effective use without discarding the ROM.

It should be noted that the abnormal display of the ROM itself and the display mode of the mounting position abnormality are not limited to those in the above-described embodiment, and various display modes can be applied.

Also, the hash value for comparison criteria is the ROM to be checked.
The hash value may be stored in itself, or the hash value may be set by a dip switch or the like.

Further, the check program does not have to be stored in the ROM itself, and the check timing is not limited to the power-on timing, but may be performed at any time such as during the main program processing.

Furthermore, the recording medium to be checked is not limited to the ROM, and may be a floppy disk or the like.

EFFECTS OF THE INVENTION As described above in detail, according to the present invention, not only the abnormality of the recording medium but also the abnormality of the mounting position of the recording medium is determined. Therefore, the recording medium itself is normal. However, it is possible to avoid a waste such as discarding the recording medium which is determined as an abnormality of the recording medium itself because the recording medium in which the mounting position is erroneous, and the yield can be improved.

[Brief description of drawings]

FIG. 1 is a flow chart showing a check method in an embodiment of the present invention, FIG. 2 is a block diagram showing a device configuration to be checked, and FIG. 3 is a pre-processing for storing a hash value as a comparison reference prior to the check operation. FIG. 4 is a flowchart showing the procedure, and FIG. 4 is an explanatory diagram for explaining the check operation.
FIG. 5 is a schematic diagram showing a display form of check results. 1 ... CPU, 21-2N ... ROM, 3 ... RAM, 4 ... Floppy disk drive device, 5 ... Display device.

Claims (1)

[Claims] 1. A method for checking a recording medium in which a plurality of recording media exist and whether the recording medium is normal or abnormal, wherein the recording medium has different values and is stored in the recording medium. The reference value, which is the result of performing a predetermined calculation on the stored data, is stored in advance in a predetermined storage device in association with the mounting position information of the recording medium. When checking whether there is an abnormality, the predetermined calculation is performed on the data stored in the recording medium, and the calculated value that is the result of the execution is stored in the storage device in advance. When the recording medium matches the reference value corresponding to the medium, it is determined that the recording medium is normal, and the calculated value that is the result of the execution is the recording medium that is stored in advance in the storage device. If it does not match the reference value corresponding to the above, it further matches any one of the reference values stored in advance in the storage device in association with mounting position information of another recording medium different from the recording medium. When it is determined that the recording medium is mounted, it is determined that the position where the recording medium is mounted is abnormal, and when it is determined that the recording medium is not aligned, the recording medium is A method for checking a recording medium, which is characterized by determining that it is abnormal.