JP4654711B2 - IP network communication device and boot program update method - Google Patents

Description

  The present invention relates to an IP network communication device that has unique identification information unique to each device and performs IP network communication based on the unique identification information, and a boot program update method.

  A device (node) on the network using the IP technology must have information for identifying each node in the network. The provider of the device (node) gives unique identification information that does not overlap each device connected to the network so that the end user cannot easily change it. When the network configuration by hardware (equivalent to the second layer of the OSI layer) is Ethernet (registered trademark) from the protocol layer used in IP communication (equivalent to the third layer of the OSI layer), a MAC address is provided as an identification ID.

  As a method for setting identification information, a method has been proposed in which an identification information storage unit is provided in a ROM in which a BIOS (boot program) is stored, and an identification ID unique to the network is stored therein (Patent Literature). 1).

  Conventional private branch exchanges must conform to telephone characteristics standards (for example, the FCC standard in the United States and the ETSI standard in Germany) for each country when exported to countries around the world, including private extension telephones. . In some cases, different phone characteristics may be required depending on market demands. For this reason, it was necessary to change the hardware of the private branch exchange including the dedicated extension telephone. Therefore, it is necessary to manufacture the same model as a plurality of products for each destination, and this is very burdensome in terms of development cost, manufacturing cost, and product distribution.

Therefore, when exporting to each country, data including initial value data (tone type, ringer sound type, multiple telephone ringing intervals, LCD display language data, etc.) suitable for the exporting country is written to the private branch exchange ROM and dip A private branch exchange selected by a switch has been proposed (for example, see Patent Document 2).
JP-A-11-327679 JP 2001-169318 A

  However, serial, infrared, USB, IP network, etc. can be considered as communication means with the setting terminal used for setting identification information, but it is used for node identification on the network until the final step of the private branch exchange manufacturing process. Since the identification information to be set is not set, it is necessary to set the identification information by a communication means other than the IP network. Therefore, there is a first unsolved problem that hardware only for setting is required and it is difficult to realize cost reduction and space saving.

  The private branch exchange is composed of a boot program that is limited to the minimum necessary functions for starting the operation program and an operation program that has various functions that are used during the operation of the private branch exchange. The frequency of version upgrades such as expansion is more frequent than the boot program. FIG. 8 is a diagram for explaining a memory map in a usage state of a conventional flash memory. The flash memory constituting the private branch exchange is composed of a plurality of sectors (blocks) as shown in FIG. The size is generally several Kbytes. The EEPROM can be erased and written in units of 1 byte, but the flash memory can be erased in units of blocks and written in units of 1 byte.

  For this reason, when it is desired to update the information stored in the flash memory, the data must be stored after erasing the corresponding sector (block). The identification information is 12 bytes in the case of Ethernet (registered trademark), but allocating one sector (block) for the identification information deteriorates the memory use efficiency. For this reason, it is common to place a storage area for identification information in a part of a storage area for a boot program with a low update frequency.

  Here, if it is necessary to update the boot program during operation of the private branch exchange, the flash memory boot program storage area must be erased once in order to update the corresponding area of the flash memory. Therefore, there is a second unsolved problem that the identification information set in the apparatus is also erased.

The present invention intends to solve the second problem among the first and second problems , has unique identification information unique to each device, and performs IP network communication based on the unique identification information. With regard to the IP network communication device, in particular, in the boot program update method, the boot program update program, etc. related to the IP network communication device, the identification information set specifically for the device in updating the boot program in operation is particularly conscious. Therefore, it is an object of the present invention to update the boot program while holding it in the apparatus without input / output.

In order to solve the second problem and achieve the second object, the IP network communication device of the present invention has unique identification information unique to each device and performs IP network communication based on the unique identification information. An IP network communication apparatus, a boot program storage area including a boot program of the IP network communication apparatus and an identification information storage area for storing unique identification information, and an identification for storing a copy of the unique identification information outside the boot program storage area A flash memory having an information copy storage area; identification information extracting means for acquiring unique identification information from the identification information storage area of the flash memory when the boot program is updated; and saving the acquired unique identification information in the identification information copy storage area Identification information copy means, flash memory boot program and unique identifier A flash memory erasing unit for erasing a boot program storage area including information; a boot program acquiring unit for acquiring an updated boot program from outside; a boot program storage unit for storing the acquired updated boot program in the boot program storage region; And identifying information storage means for copying the identified unique identification information from the identification information copy storage area to the identification information storage area .

  According to the present invention, there is an advantage that the IP network communication device can update the boot program while retaining the identification information set unique to the device even when updating the boot program in operation.

An IP network communication apparatus according to a first aspect of the present invention is an IP network communication apparatus that has unique identification information unique to each apparatus and performs IP network communication based on the unique identification information, and a boot program for an IP network communication apparatus a flash memory having the identification information copy storage area for storing a copy of the unique identification information and the boot program storage area including the identification information storage area for storing unique identification information, out of the boot program storage area and the updating of the boot program flash and identification information extraction means for acquiring a unique identification information from the identification information storage region of the memory, the acquired identification information copying means for retracting the unique identification information in the identification information copy storage area, boot program and unique identification information of the flash memory when Boot program storage area including The flash memory erasing means to be erased, the boot program obtaining means for obtaining the updated boot program from the outside, the boot program storage means for storing the obtained updated boot program in the boot program storage area, and the saved unique identification information as identification information Identification information storage means for copying from the copy storage area to the identification information storage area. With this configuration, when the boot program storage area is erased by updating the boot program or the like, if the identification information storage area is erased, the unique identification information can be saved in the identification information copy storage area. After the update, the unique identification information that has been saved can be returned to the identification information storage area.

A boot program update method according to a second aspect of the present invention is a boot program update method for an IP network communication device that has unique identification information unique to each device and performs IP network communication based on the unique identification information. A boot program storage area including a boot program for the communication device and an identification information storage area for storing unique identification information, and an identification information copy storage area for storing a copy of the unique identification information outside the boot program storage area are arranged in the flash memory. When the boot program is updated, the unique identification information is acquired from the identification information storage area of the flash memory , the acquired unique identification information is saved in the identification information copy storage area, and the boot program including the flash memory boot program and the unique identification information is stored. Erase storage area and update from outside Get the over preparative program, and stores the update boot program acquired in the boot program storage area, copying the unique identification information is retracted from the identification information copy storage area to the identification information storage region. With this configuration, the unique identification information can be saved in the identification information copy storage area, and after the boot program is updated, the saved unique identification information can be returned to the identification information storage area.

Boot program update program in the third aspect of the present invention is stored in a storage device mounted on an IP network communication apparatus for performing IP network communication based on the unique identification information has the device-specific unique identification information, wherein A boot program update program for updating a boot program of an IP network communication device, including a boot program storage area including a boot program and an identification information storage area for storing unique identification information, and unique identification information outside the boot program storage area Identification information extracting means for acquiring unique identification information from the identification information storage area of the flash memory having an identification information copy storage area for storing a copy, and identification information copying means for saving the acquired unique identification information in the identification information copy storage area And the flash memory boot program Flash memory erasing means for erasing the boot program storage area including the program and unique identification information, boot program obtaining means for obtaining an updated boot program from the outside, and boot program storage for storing the obtained updated boot program in the boot program storage area And identification information storage means for copying the saved unique identification information from the identification information copy storage area to the identification information storage area. With this configuration, the IP network communication device storing the boot program update program in the storage device has a unique identification when the identification information storage region is erased when the boot program storage region is erased by updating the boot program or the like. Information can be saved in the identification information copy storage area, and the saved unique identification information can be returned to the identification information storage area after the boot program is updated.

  Embodiments of an IP network communication apparatus according to the present invention will be described below in detail with reference to the drawings. In the following embodiments, a private branch exchange will be described as an example of an IP network communication device, but the present invention is not limited thereby.

(Embodiment 1)
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a private branch exchange which is an IP network communication apparatus according to the first embodiment. A private branch exchange 100 as an IP network communication apparatus has the configuration shown in FIG. In FIG. 1, 101 is a central processing unit, 102 is a flash memory which is a readable / writable nonvolatile memory for storing programs and data, 103 is a rewritable random access memory for storing programs and data, and 104 is reset. An input unit such as a reset button or a mode switch for setting an operation mode, 105 is an output unit composed of an LED, an LCD or the like used for displaying an operation mode or error display of the private branch exchange, and 106 is connected via a connector or the like An external storage device 107 such as an SD card, CompactFlash (registered trademark), or smart media connected to the bus for reading and writing data, and an external setting terminal 112 and an intermediary such as Ethernet (registered trademark), serial, and USB are used. Communication control unit for communication, 108 is a telephone connection The a line control unit for performing signal controlling extension and nets line. Each component is connected via a bus 114.

  The flash memory 102 includes a boot program storage area 109 for storing a boot program that is executed first when the power is turned on or reset, and controls the minimum functions necessary for starting up the entire system, and a local area used during operation. An operation program storage area 110 for storing a program for controlling all necessary functions of the exchange 100 is provided. The random access memory 103 includes a program / data storage area 111 for storing programs and data that may be updated, and an identification information temporary storage area 113 for temporarily storing unique identification information. Is provided. Reference numeral 112 denotes a setting terminal provided outside for use in setting the unique identification information of the private branch exchange.

  FIG. 2 is a diagram showing a memory map of the flash memory of FIG. In FIG. 2, the flash memory 102 includes two areas, a boot program storage area 201 and an operation program storage area 202. In the boot program storage area 201, a boot program that is executed first when the power is turned on or reset and controls the minimum functions necessary to start up the entire system is stored in a program format that operates as it is or in a compressed binary format. Stored. On the other hand, in the operation program storage area 202, a program that is used when the private branch exchange is operated and that controls all functions required by the private branch exchange is stored in a program format that operates as it is or in a compressed binary format.

  In the boot program storage area 201, an identification information storage area 203 is provided, which is prepared for identifying each node in the network and stores unique identification information that cannot be basically changed by the end user. It has been. In the operation program storage area 202, a setting identification information storage area 204 that is temporarily used when the unique identification information is not set in the identification information storage area 203 is provided.

  The setting location of the setting identification information storage area 204 may be provided on the boot program. Further, the boot program storage area 201 and the operation program storage area 202 may be arranged in a flash memory of another chip. From the viewpoint of cost reduction and space saving, it is desirable to arrange the boot program storage area 201 and the operation program storage area 202 on one chip. The boot program stored in the boot program storage area 201 and the operation program stored in the operation program storage area 202 may directly operate on the flash memory, or may be copied or expanded on the random access memory 103. However, copying may be performed on the random access memory 103.

  FIG. 3 is a flowchart of the identification information set program of the private branch exchange shown in FIG. Here, unique identification information for identifying each node in the network to the private branch exchange 100 (for example, if the network is Ethernet (registered trademark), a MAC address composed of 12-byte data is unique identification information). An example of setting the value will be described.

  When setting the unique identification information, first, the setting terminal 112 existing outside is brought into a state where it can communicate with the private branch exchange 100. After the private branch exchange 100 is powered on or reset, the boot program is first started. The boot program checks whether the private branch exchange 100 can operate correctly by performing hardware diagnosis and checking for damage to the operation program that is software in order to check whether or not the entire apparatus can be started. If it is determined, the process is transferred to the operation program.

  In the operation program, a series of initialization procedures for operating the private branch exchange 100 is performed at an early stage. In the initialization procedure, when the communication control unit 107 is initialized, the operation program operates as the identification information set program shown in the flowchart of FIG. First, the identification information set program acquires unique identification information from the identification information storage area 203 (step S301). Next, the unique identification information is stored in the identification information temporary storage area 113 on the random access memory 103 (step S302).

  Thereafter, it is confirmed whether the unique identification information stored in the identification information temporary storage area 113 is normally set or not set (for example, when no data is written in the flash memory If it is set, the process jumps to step S306. If it is not set, the setting identification information stored in the setting identification information storage area 204 is acquired. (Step S304).

  Then, the setting identification information is stored in the identification information temporary storage area 113 on the random access memory 103 (step S305). At this point, identification information (unique identification information or setting identification information) used to identify each node in the network is stored in the identification information temporary storage area 113.

  Next, the data stored in the identification information temporary storage area 113 is set in the communication control unit (step S306). Thereafter, the communication control unit is set up in a communicable state (step S307). In this state, network communication can be performed using the setting terminal 112. Thereby, individual identification information (such as a MAC address) is subsequently set in the identification information storage area 203 via the network.

  FIG. 4 is a functional block diagram of the identification information set program of the private branch exchange shown in FIG. In FIG. 4, the identification information set program of this embodiment has an identification information extraction unit 401, an identification information determination unit 402, a setting identification information extraction unit 403, a communication control unit setting unit 404, and a communication control unit 405. Yes. These are loaded into the central processing unit 101 and operate.

  The identification information extraction unit 401 acquires unique identification information from the identification information storage area 203 on the flash memory 102 at the time of initial activation. The identification information determination unit 402 determines whether the unique identification information acquired from the identification information storage area 203 is unset data. The setting identification information extraction unit 403 acquires the setting specific identification information from the setting identification information storage area 204 on the flash memory 102. The communication control unit setting unit 404 enables network communication by setting either the unique identification information or the setting identification information in the communication control unit 107. The communication control unit 405 provides a network communication function.

  As described above, in the present embodiment, network communication can be performed even when unique identification information is not yet set in the identification information storage area 203, and the unique identification information is stored in the identification information storage area 203 by this network communication. Can be set. That is, even when unique identification information is not yet set in the identification information storage area 203, unique identification information can be stored without using other communication means such as serial, infrared, and USB. As a result, it is possible to provide an advantage that cost reduction and space saving can be realized. In addition, by providing a storage medium, it is possible to easily construct a system that can be easily upgraded and has high secrecy.

(Embodiment 2)
Embodiment 2 of an IP network communication apparatus according to the present invention will be described below with reference to the drawings. Although this embodiment will be described by taking a private branch exchange as an example of the IP network communication device, it is not limited to this. The hardware configuration of the private branch exchange as the IP network communication apparatus of the present embodiment is the same as that of the first embodiment shown in FIG.

  FIG. 5 is a diagram showing a memory map of the flash memory according to the second embodiment. In the flash memory 102 according to the present embodiment, an identification information copy storage area 501 is newly added to the storage area 202. The identification information copy storage area 501 temporarily stores a copy of the unique identification information in order to hold the unique identification information stored in the identification information storage area 203 in the private branch exchange when the boot program is updated. This is a unique identification information copy storage area. Other hardware configurations are the same as those in the first embodiment.

  The unique identification information copy storage area 501 may be in a memory area other than the boot program storage area 201 so as not to be affected by the update (erasure) of the boot program. 103 may be stored. However, the unique identification information is unique unique identification information that does not overlap with each device (node) connected to the network and cannot be easily changed by the end user. Therefore, it is necessary to consider that information is not lost as much as possible even when the power is turned off for some reason when updating the boot program. For this reason, the identification information copy storage area 501 is preferably stored in the flash memory 102 which is a nonvolatile memory.

  FIG. 6 is a flowchart of the boot program update program of the private branch exchange according to the second embodiment. Here, unique identification information for identifying each node in the network to the private branch exchange 100 (for example, if the network is Ethernet (registered trademark), a MAC address composed of 12-byte data is unique identification information). An example will be described in which the boot program is updated while the private branch exchange is maintained.

  First, the setting terminal 112 is made communicable with the private branch exchange, and a boot program update request is made. When the boot program update function is activated in the operation program in operation, the boot program update program operates. It is assumed that the identification information copy storage area 501 is arranged in the flash memory 102.

  First, the boot program update program acquires unique identification information from the identification information storage area 203 existing in the boot program storage area 201 of the flash memory 102 (step S601). Next, in order to determine whether data can be written in the identification information copy storage area 501 in the flash memory 102, data is acquired from the identification information copy storage area 501 (step S602).

  Next, it is determined whether or not the acquired data is unset (step S603). Note that the data stored in the identification information copy storage area 501 is in a state where the unique identification information set at the time of the previous boot program update remains as it is until the current processing, or the boot This means that the data in the identification information copy storage area 501 has only become empty when the operation program is updated by the program. This is because the unique identification information, which is a unique value that does not overlap each device (node), is not set to a different value every time the boot program is updated.

  If the determination result in step S603 is not set, the identification information copy storage area 501 on the flash memory is not stored with the unique identification information, so that data can be written. Therefore, the unique identification information acquired in step S601 is used as the identification information. Store in the copy storage area 501. That is, the unique identification information is temporarily saved in the identification information copy storage area 501 (step S604). On the other hand, if the determination result in step S603 is the setting state, it is not necessary to store the unique identification information having the same value, and the process jumps to step S605 without performing the process in step S604.

  The unique identification information has been stored (saved) in the identification information copy storage area 501 through the operations up to this point, so that the boot program storage area 201 on the flash memory 102 is next stored in order to update the boot program. Erasing is performed (step S605). After erasing the boot program storage area 201, a version of the updated boot program to be updated via the external storage device 106 that can read and write to an SD card, a compact flash (registered trademark), or the communication control unit 107 is stored in the random access memory. 103 is acquired in the program / data storage area 111 on the server 103 (step S606). Thereafter, the updated boot program is stored in the boot program storage area 201 on the flash memory 102 (step S607).

  After step S607 ends, it is checked whether the stored updated boot program is stored correctly (step S608). If the updated boot program is not stored correctly, the process is repeated from step S605. If the updated boot program is correctly stored, the unique identification information stored in the identification information copy storage area 501 is acquired (step S609). Thereafter, the identification information storage area 203 on the updated boot program storage area 201 should be in an unset state, so that it can be written, and the unique identification information acquired in step S609 is stored in the identification information storage area 203. That is, the unique identification information once saved in the identification information copy storage area 501 is returned to the identification information storage area 203 (step S610).

  If the identification information copy storage area 501 is arranged on the random access memory (RAM), the unique identification information can always be written in the corresponding area, so that the processing in steps S602 and S603 is not necessary. In this case, execution may be shifted to step S604 after the process of step S601.

  Further, when the flash memory 102 is composed of one chip and both the boot program and the operation program are stored in the same chip, when erasing the boot program in step S605, the sector (block) corresponding to the boot program is erased. ) Only. On the other hand, when the flash memory 102 is composed of a plurality of chips and the boot program and the operation program are composed of separate chips, the entire contents of the flash memory storing the boot program may be erased.

  In step S607, the updated boot program is stored in the boot program storage area 201 via the program / data storage area 111. If the size of the updated boot program is larger than the program / data storage area 111, step S606 and step S607 may be alternately executed in units of size not exceeding the size of the program / data storage area 111.

  FIG. 7 is a functional block diagram of the main part of the boot program update program of FIG. In FIG. 7, the boot program update program includes an identification information extracting unit 701, an identification information copying unit 702, a flash memory erasing unit 703, a boot program acquisition unit 704, a boot program storage unit 705, and an identification information storage unit 706. . These are loaded into the central processing unit 101 and operate.

  The identification information extraction unit 701 acquires unique identification information from the identification information storage area 203 of the flash memory 102. The identification information copy unit 702 copies the unique identification information acquired by the identification information extraction unit 701 to the identification information copy storage area 501. The flash memory erasing unit 703 erases the boot program storage area 201 of the flash memory 102. The boot program acquisition unit 704 acquires an updated boot program. The boot program storage unit 705 stores the updated boot program acquired by the boot program acquisition unit 704 in the boot program storage area 201 of the flash memory 102. The identification information storage unit 706 copies the unique identification information saved (stored) by the identification information copy unit 702 to the identification information storage area 203. By providing the updated boot program in a storage medium, it is possible to easily construct a highly confidential system that can be upgraded easily.

  As described above, the present embodiment has an advantage that the boot program can be updated while retaining the unique identification information set unique to the apparatus even during operation of the private branch exchange.

(Embodiment 3)
In the present embodiment, the unique identification information stored in the identification information storage area 203 in the first and second embodiments described above is necessary not only for identifying each node in the network but also for the private branch exchange. The destination state is included. Destination data is data that must conform to telephone characteristics standards for each country when exported to countries around the world, including dedicated extension telephones. Data, specifically, data including tone type, ringer type, multiple telephone ringing interval, LCD display language data, and the like.

  Such destination information can exist regardless of the boot program or the operation program. By storing the destination information in the identification information storage area 203 described in the first embodiment and the second embodiment, it is not necessary to create a program corresponding to each destination, and the program can be shared.

  This eliminates the need to manufacture the same model as a plurality of products for each destination, which is very advantageous in terms of development cost, manufacturing cost, and product distribution. In addition, since the writing is done only once at the time of shipment, the sale that purchased the private branch exchange on the regular route by cross-flowing the product (re-exporting the product exported to a cheap country to another country and selling it cheaper than the regular route) Store dealers do not suffer from disadvantages.

  Further, by storing not only one unique identification information but also a plurality of unique identification information in the identification information storage area, the private branch exchange can be operated like a router, and a call control sequence control block (call control It is also possible to distribute the system load by assigning unique identification information dedicated to call control to the CPU and assigning another unique identification information to the voice packet (RTP packet) processing block (RTP packet processing CPU). .

  The present invention is useful when applied to an IP network communication apparatus that has unique identification information unique to each apparatus and performs IP network communication based on the unique identification information, and is particularly suitable for a private branch exchange. is there.

Block diagram of a private branch exchange which is an IP network communication apparatus according to the first embodiment The figure which shows the memory map of the flash memory of FIG. Flowchart of identification information set program for private branch exchange in FIG. Functional block diagram of the identification information set program of the private branch exchange shown in FIG. The figure which shows the memory map of the flash memory of Embodiment 2. Flowchart of a boot program update program for a private branch exchange according to the second embodiment Functional block diagram of the main part of the boot program update program of FIG. The figure explaining the memory map in the use condition of the conventional flash memory

Explanation of symbols

100 Private branch exchange (IP network communication device)
101 Central processing unit 102 Flash memory (read-write nonvolatile memory)
103 Random Access Memory 104 Input Unit 105 Output Unit 106 External Storage Device 107 Communication Control Unit 108 Line Control Unit 109, 201 Boot Program Storage Area 110, 202 Operation Program Storage Area 111 Program / Data Storage Area 112 Setting Terminal 113 Identification Information Temporary Storage Area 114 Bus 203 Identification information storage area 204 Setting identification information storage area 401 Identification information extraction means 402 Identification information determination means 403 Setting identification information extraction means 404 Communication control setting means 405 Communication control means 501 Identification information copy storage area 701 Identification information Extraction means 702 Identification information copy means 703 Flash memory erasure means 704 Boot program acquisition means 705 Boot program storage means 706 Identification information storage means

Claims (3)

An IP network communication device that has unique identification information unique to each device and performs IP network communication based on the unique identification information,
And the boot program storage area including the identification information storage area for storing the unique identification information and the boot program of the IP network communication apparatus, identification information copy storage area for storing a copy of said unique identification information to the outside of the boot program storage area A flash memory having
Identification information extracting means for acquiring the unique identification information from the identification information storage area of the flash memory when the boot program is updated ;
An identification information copy means for saving the acquired unique identification information in an identification information copy storage area;
A flash memory erasing means for erasing the boot program storage area including a boot program and a unique identification information of the flash memory,
A boot program acquisition means for acquiring an updated boot program from the outside;
Boot program storage means for storing the acquired updated boot program in the boot program storage area;
An IP network communication apparatus comprising: identification information storage means for copying the saved unique identification information from the identification information copy storage area to the identification information storage area. A boot program update method for an IP network communication device that has unique identification information unique to each device and performs IP network communication based on the unique identification information,
A boot program storage area including a boot program of the IP network communication device and an identification information storage area for storing the unique identification information; and an identification information copy storage area for storing a copy of the unique identification information outside the boot program storage area And place it in flash memory ,
Obtaining the unique identification information from the identification information storage area of the flash memory when updating the boot program ;
The acquired unique identification information is saved in the identification information copy storage area,
Erasing the boot program storage area including the boot program and unique identification information of the flash memory ,
Obtain an updated boot program from the outside,
Store the obtained update boot program in the boot program storage area,
A boot program update method for an IP network communication apparatus, wherein the saved unique identification information is copied from the identification information copy storage area to the identification information storage area. A boot program update program that has unique identification information unique to each device and is stored in a storage device mounted on an IP network communication device that performs IP network communication based on the unique identification information, and updates a boot program of the IP network communication device Because
A flash memory having a boot program storage area including the boot program and an identification information storage area for storing the unique identification information, and an identification information copy storage area for storing a copy of the unique identification information outside the boot program storage area the identification information extraction means from the identification information storage region and acquires the unique identification information,
An identification information copy means for saving the acquired unique identification information in an identification information copy storage area;
A flash memory erasing means for erasing the boot program storage area including a boot program and a unique identification information of the flash memory,
A boot program acquisition means for acquiring an updated boot program from the outside;
Boot program storage means for storing the acquired updated boot program in the boot program storage area;
A boot program update program, comprising: identification information storage means for copying the saved unique identification information from the identification information copy storage area to the identification information storage area.

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