JP2015090508A - Electronic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To be able to boot an OS (Operating System) even if not preparing a device for rewriting a boot program when having failed in rewriting of a program including the boot program, and to execute the rewriting of the program thereafter.SOLUTION: It is assumed that it has failed in rewriting firmware before update stored in a NAND type flash memory 41 to update-version firmware stored in a USB memory 19. When a long-time pressing detection circuit 17 has detected long-time pressing of a power button 23 in a state that the USB memory 19 is connected to a USB connector 13, an electronic device reads a boot program included in the update-version firmware stored in the USB memory 19, and boots an OS. After the boot of the OS, the electronic device reads the update-version firmware stored in the USB memory 19, and rewrites the firmware before the update stored in the NAND type flash memory 41 to the update-version firmware.

Description

  The present invention relates to a technique for rewriting a program including a boot program in an electronic device.

  The boot program is software for starting up an OS (Operating System) of the computer. The boot program is stored in a non-volatile storage device such as a flash memory, and the boot program is read from the flash memory and executed to start the OS.

  The boot program is included in a predetermined program such as firmware. The firmware is stored in the flash memory and is rewritten (for example, updated).

  When the electronic device is not connected to the network, the rewritten firmware is read from a portable storage medium such as a USB memory, and the firmware is rewritten. If the power to the electronic device is interrupted or the USB memory is removed from the electronic device during the firmware rewriting, the firmware rewriting fails. As a result, if the boot program is not stored in the flash memory, the OS cannot be started.

  Therefore, even if the USB memory is removed from the electronic device, the update file stored in the USB memory is read into the printing device in order to prevent the rewriting of the firmware from failing, and then based on the read update file. A printing apparatus that updates firmware has been proposed (see, for example, Patent Document 1).

JP 2008-162054 A (summary)

  Even if the rewriting of the firmware fails, the OS can be started by writing the boot program into the flash memory by a device that writes the program into the flash memory called a flash writer.

  The present invention provides an electronic device that can start an OS without a device for writing a boot program when the rewriting of a program including a boot program fails, and thereafter can rewrite the program. The purpose is to provide.

  An electronic device according to the present invention that achieves the above object is an electronic device that activates an OS using a boot program, and includes a non-volatile storage unit that stores a predetermined program including the boot program, and the non-volatile storage A boot unit that reads out the boot program stored in the unit and starts the OS; an interface unit to which a portable storage medium storing the rewritten version of the predetermined program is connected; An accepting unit for accepting an operation, and when the accepting unit accepts the predetermined operation in a state where the portable storage medium is connected to the interface unit, The boot program included in the predetermined program of the rewritten version stored in the portable storage medium is entered into the start mode. And the OS is started, and after the OS is started in the abnormal startup mode, the rewritten version of the predetermined program stored in the portable storage medium is read and the nonvolatile memory is read. A rewriting unit that rewrites the predetermined program stored in the sexual storage unit before rewriting into the predetermined program of a rewritten version.

  The electronic apparatus according to the present invention is based on the premise that a predetermined program including a boot program is rewritten using a portable storage medium storing a rewritten version of the predetermined program instead of a network. When rewriting fails due to power interruption of the electronic device during rewriting, the user performs a predetermined operation (for example, long press of the power button). As a result, the activation unit shifts to the abnormal activation mode, reads the boot program included in the rewritten version of the predetermined program stored in the portable storage medium, and activates the OS. Therefore, according to the electronic apparatus of the present invention, when rewriting of a program including a boot program fails, the OS can be started without preparing a device for writing the boot program in the nonvolatile storage unit. it can.

  In the electronic device according to the present invention, after the OS is started up using the boot program stored in the portable storage medium, the rewriting unit automatically rewrites the predetermined program.

  As described above, according to the electronic apparatus of the present invention, when rewriting of a program including a boot program fails, the OS can be started without preparing a device for writing the boot program. You can rewrite the program.

  In the above configuration, the electronic device includes a power button for turning on the power, and the reception unit measures a time during which the power button is pressed and reaches a predetermined first predetermined time, It is determined that the power button is long pressed, and the long press of the power button is accepted as the predetermined operation.

  This configuration is a mode in which a predetermined operation is a long press of the power button.

  In the above configuration, when the reception unit determines that the power button is stopped before reaching the first predetermined time, the activation unit shifts to a normal activation mode, and The nonvolatile storage unit is accessed, the boot program stored in the nonvolatile storage unit is read, and the OS is activated.

  According to this configuration, the normal start mode and the abnormal start mode can be selected depending on whether the operation of pressing the power button is a long press of the power button.

  According to the present invention, when rewriting of a program including a boot program fails, the OS can be started without preparing a device for writing the boot program, and then the program can be rewritten.

2 is an explanatory diagram for explaining an outline of an internal structure of the image forming apparatus according to the embodiment. FIG. FIG. 2 is a block diagram illustrating a configuration of the image forming apparatus illustrated in FIG. 1. 3 is a block diagram illustrating a hardware configuration of a control unit of the image forming apparatus according to the present exemplary embodiment. FIG. It is a block diagram which shows the hardware constitutions of the controller board contained in a control part. It is a functional block diagram of a controller board. In this embodiment, it is a flowchart explaining the operation | movement of normal time starting mode. It is a time chart which shows operation | movement of normal time starting mode. In this embodiment, it is a flowchart explaining operation | movement of the starting mode at the time of abnormality. It is a time chart which shows operation | movement of the starting mode at the time of abnormality.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory diagram for explaining an outline of the internal structure of an image forming apparatus 1 (an example of an electronic apparatus) according to an embodiment of the present invention. The image forming apparatus 1 can be applied to, for example, a digital multifunction machine having functions of a copy, a printer, a scanner, and a facsimile. The image forming apparatus 1 is disposed on the apparatus main body 100, an original reading unit 200 disposed on the apparatus main body 100, an original feeding unit 300 disposed on the original reading unit 200, and an upper front surface of the apparatus main body 100. An operation unit 400 is provided.

  The document feeding unit 300 functions as an automatic document feeding device, and can feed a plurality of documents placed on the document placing unit 301 so that the document reading unit 200 can read them continuously.

  The document reading unit 200 includes a carriage 201 on which an exposure lamp or the like is mounted, a document table 203 made of a transparent member such as glass, a CCD (Charge Coupled Device) sensor (not shown), and a document reading slit 205. When reading a document placed on the document table 203, the document is read by the CCD sensor while moving the carriage 201 in the longitudinal direction of the document table 203. On the other hand, when reading a document fed from the document feeding unit 300, the carriage 201 is moved to a position facing the document reading slit 205, and the document fed from the document feeding unit 300 is scanned. Reading is performed by the CCD sensor through the reading slit 205. The CCD sensor outputs the read original as image data.

  The apparatus main body 100 includes a sheet storage unit 101, an image forming unit 103, and a fixing unit 105. The sheet storage unit 101 is disposed at the lowermost part of the apparatus main body 100 and includes a sheet tray 107 that can store a bundle of sheets. In the bundle of sheets stored in the sheet tray 107, the uppermost sheet is sent out toward the sheet conveyance path 111 by driving the pickup roller 109. The sheet is conveyed to the image forming unit 103 through the sheet conveyance path 111.

  The image forming unit 103 forms a toner image on the conveyed paper. The image forming unit 103 includes a photosensitive drum 113, an exposure unit 115, a developing unit 117, and a transfer unit 119. The exposure unit 115 generates modulated light corresponding to image data (image data output from the document reading unit 200, image data transmitted from a personal computer, image data received by facsimile, etc.), and is uniformly charged. Irradiate to the peripheral surface of the photosensitive drum 113. As a result, an electrostatic latent image corresponding to the image data is formed on the peripheral surface of the photosensitive drum 113. In this state, toner is supplied to the peripheral surface of the photosensitive drum 113 from the developing unit 117, so that a toner image corresponding to the image data is formed on the peripheral surface. This toner image is transferred by the transfer unit 119 to the sheet conveyed from the sheet storage unit 101 described above.

  The sheet on which the toner image is transferred is sent to the fixing unit 105. In the fixing unit 105, heat and pressure are applied to the toner image and the paper, and the toner image is fixed to the paper. The paper is discharged to the stack tray 121 or the paper discharge tray 123.

  The operation unit 400 includes an operation key unit 401 and a display unit 403. The display unit 403 has a touch panel function, and displays a screen including soft keys. The user operates the soft key while viewing the screen to make settings necessary for executing functions such as copying.

  The operation key unit 401 is provided with operation keys including hard keys. Specifically, a start key 405, a numeric keypad 407, a stop key 409, a reset key 411, a function switching key 413 for switching between copy, printer, scanner, and facsimile are provided.

  A start key 405 is a key for starting operations such as copying and facsimile transmission. A numeric keypad 407 is a key for inputting numbers such as the number of copies and a facsimile number. A stop key 409 is a key for stopping a copy operation or the like halfway. The reset key 411 is a key for returning the set contents to the initial setting state.

  The function switching key 413 includes a copy key, a transmission key, and the like, and is a key for switching between a copy function, a transmission function, and the like. When the copy key is operated, an initial copy screen is displayed on the display unit 403. When the transmission key is operated, an initial screen for facsimile transmission and mail transmission is displayed on the display unit 403.

  FIG. 2 is a block diagram showing a configuration of the image forming apparatus 1 shown in FIG. The image forming apparatus 1 has a configuration in which an apparatus main body 100, a document reading unit 200, a document feeding unit 300, an operation unit 400, a control unit 500, and a communication unit 600 are connected to each other by a bus. Since the apparatus main body 100, the document reading unit 200, the document feeding unit 300, and the operation unit 400 have already been described, description thereof will be omitted.

  The communication unit 600 includes a facsimile communication unit 601 and a network I / F unit 603. The facsimile communication unit 601 includes an NCU (Network Control Unit) that controls connection of a telephone line with a destination facsimile, and a modulation / demodulation circuit that modulates / demodulates a signal for facsimile communication. The facsimile communication unit 601 is connected to the telephone line 605.

  The network I / F unit 603 is connected to a LAN (Local Area Network) 607. A network I / F unit 603 is a communication interface circuit for executing communication with a terminal device such as a personal computer connected to the LAN 607.

  The control unit 500 will be described. FIG. 3 is a block diagram illustrating a hardware configuration of the control unit 500. The control unit 500 includes a controller board 11, a USB connector 13 (an example of an interface unit), an internal power supply 15, and a long press detection circuit 17 (an example of a reception unit).

  On the controller board 11, main devices (such as the CPU 49 and the DRAM 43 shown in FIG. 4) for controlling the image forming apparatus 1 are mounted.

  The USB connector 13 is an interface unit to which the USB memory 19 is connected. The USB connector 13 is attached to the cabinet of the image forming apparatus 1. The USB memory 19 is an example of a portable storage medium. Other portable storage media include SD memory (SD Memory) and CD (compact disc).

  The internal power supply 15 converts an AC voltage supplied from an external power supply (commercial power supply) 21 of the image forming apparatus 1 into a DC voltage, or converts the voltage of the DC voltage. The internal power supply 15 supplies power to the controller board 11 and the long press detection circuit 17.

  In the cabinet of the image forming apparatus 1, a power button 23 for turning on the image forming apparatus 1 is arranged. When the power button 23 is pressed, AC power is supplied from the external power supply 21 to the internal power supply 15 and the internal power supply 15 is activated.

  The long press detection circuit 17 includes a timer 25 that measures the time during which the power button 23 is pressed. The long press detection circuit 17 determines that the power button 23 is long pressed when the time during which the power button 23 is pressed reaches a predetermined first predetermined time. When the long press detection circuit 17 determines that the power button 23 is stopped being pressed before the time during which the power button 23 is pressed reaches the first predetermined time, the long press detection circuit 17 determines that the power is being turned on normally. . The long press detection circuit 17 is an example of a reception unit that receives a predetermined operation (long press of the power button 23).

  The controller board 11 will be described in detail. FIG. 4 is a block diagram showing a hardware configuration of the controller board 11. The controller board 11 includes a NAND-type flash memory (NAND-type flash memory) 41, a DRAM 43, an ASIC (Application Specific Integrated Circuits) 45, and a bus 47 that connects these components to each other.

  The NAND flash memory 41 functions as a ROM and stores programs (firmware including a boot program, various programs including an OS) and data necessary for controlling the operation of the image forming apparatus 1. The NAND flash memory 41 has a function of storing image data generated by the document reading unit 200 (FIG. 2), image data received by the communication unit 600 (FIG. 2), and the like.

  The NAND flash memory 41 is an example of a nonvolatile storage unit that stores a predetermined program including a boot program. Other non-volatile storage units include a NOR-type flash memory and an HDD (Hard Disk Drive).

  The DRAM 43 is used for developing programs and image data stored in the NAND flash memory 41.

  The ASIC 45 includes a CPU 49, a NAND controller 51, and a USB controller 55.

  The CPU 49 executes control necessary for operating the image forming apparatus 1 on the above-described components of the image forming apparatus 1 such as the apparatus main body 100 shown in FIG.

  The NAND controller 51 controls reading, writing, and erasing of programs and data with respect to the NAND flash memory 41.

  The USB controller 55 controls reading, writing, and erasing of programs and data with respect to the USB memory 19 shown in FIG.

  FIG. 5 is a functional block diagram of the controller board 11. The controller board 11 includes an activation unit 61 and a rewriting unit 63.

  When the long press detection circuit 17 shown in FIG. 3 determines that the operation of the power button 23 is a long press of the power button 23, the activation unit 61 shifts to the abnormal start mode, and the long press detection circuit 17 performs the operation of the power button 23. When it is determined that the power is turned on normally, the operation shifts to the normal startup mode.

  In the normal startup mode, the startup unit 61 accesses the NAND flash memory 41 shown in FIG. 4, reads the boot program stored in the NAND flash memory 41, and starts up the OS of the image forming apparatus 1. .

  If rewriting of the firmware stored in the USB memory 19 fails and the user presses the power button 23 for a long time while the USB memory 19 is connected to the USB connector 13, the startup unit 61 Transition to start mode. In the abnormal-time activation mode, the activation unit 61 reads the boot program included in the rewritten firmware stored in the USB memory 19 and activates the OS of the image forming apparatus 1.

  Therefore, in the present embodiment, the normal start mode and the abnormal start mode can be selected depending on whether or not the operation of pressing the power button 23 is a long press of the power button 23.

  The rewriting unit 63 reads the rewritten firmware from the USB memory 19 connected to the USB connector 13 and rewrites the pre-rewritten firmware stored in the NAND flash memory 41 with the rewritten firmware.

  Further, the rewriting unit 63 reads out the rewritten firmware stored in the USB memory 19 after the OS is started in the abnormal start mode, and the firmware before rewriting stored in the NAND flash memory 41. To the rewritten firmware.

  Hereinafter, rewriting of firmware including a boot program will be described by taking update as an example, but rewriting other than update may be used (for example, upgrade).

  The operation in the normal startup mode of the image forming apparatus 1 according to the present embodiment will be described mainly with reference to FIGS. 3, 4, 6, and 7. FIG. 6 is a flowchart for explaining the operation in the normal startup mode. FIG. 7 is a timing chart showing the operation in the normal startup mode.

  When the user presses the power button 23 (step S1), power from the external power source 21 is supplied to the internal power source 15 to start the internal power source 15 (time t1), and a voltage is applied from the internal power source 15 to the long press detection circuit 17. Supplied. As a result, the reset of the long press detection circuit 17 is released, and the timer 25 is activated (step S3: time t2). The timer 25 measures a first predetermined time (for example, 10 seconds) and a second predetermined time (for example, 13 seconds) longer than the first predetermined time.

  The long press detection circuit 17 monitors whether or not the power button 23 is pressed, and determines whether or not the time during which the power button 23 is pressed has reached the first predetermined time (step S5). If pressing of the power button 23 is stopped before the time when the power button 23 is pressed reaches the first predetermined time (No in step S5), the long press detection circuit 17 causes the long press of the power button 23 to be stopped. Is not determined (step S7). That is, the long press detection circuit 17 determines that the operation of the power button 23 is a normal power-on operation. Accordingly, the long press detection circuit 17 maintains the L level without switching the output signal S1 (FIG. 3) from the L level to the H level (time t3).

  On the other hand, when the long press detection circuit 17 determines that the time during which the power button 23 is pressed has reached the first predetermined time (Yes in step S5), it is determined that the power button 23 has been pressed long. (Step S9). Thereafter, the process proceeds to Step T11 (FIG. 8) in the abnormal start mode described later.

  After step S7, when the time measured by the timer 25 exceeds the first predetermined time and reaches the second predetermined time (step S11), the internal power supply 15 supplies a voltage to the controller board 11 (time t5). ). Thereby, the reset of the CPU 49 is released (step S13).

  The reason why the reset of the CPU 49 is released at this point will be described. The long press detection circuit 17 determines whether or not the power button 23 is long pressed by whether or not the time during which the power button 23 is pressed reaches a first predetermined time. If it is not determined that the power button 23 has been pressed for a long time, the process shifts to a normal startup mode. Until it is determined whether or not the time during which the power button 23 is pressed reaches the first predetermined time, it is not known whether the operation mode shifts to the normal start mode or the abnormal start mode. For this reason, it is necessary to continue resetting the CPU 49 until a time longer than the first predetermined time (second predetermined time in this embodiment) is reached. Therefore, in the present embodiment, the reset of the CPU 49 is released after reaching the second predetermined time. In the abnormal start mode described later, as shown in FIG. 9, the reset of the CPU 49 is released after reaching the second predetermined time, for the same reason.

  When the reset of the CPU 49 is released (step S13), if the output signal S1 of the long press detection circuit 17 is at the L level (not the long press of the power button 23), the NAND controller 51 operates, and if it is at the H level. (Press and hold the power button 23), the USB controller 55 operates. When the reset of the CPU 49 is released, the output signal S1 of the long press detection circuit 17 is at the L level, so the NAND controller 51 is activated (step S15).

  The NAND controller 51 determines whether a boot program is stored in the NAND flash memory 41 (step S17).

  When the NAND controller 51 determines that the boot program is not stored in the NAND flash memory 41 (No in step S17), the NAND controller 51 stops the activation of the CPU 49 (step S19).

  When the NAND controller 51 determines that the boot program is stored in the NAND flash memory 41 (Yes in step S17), the following processing is performed. The NAND controller 51 includes a RAM 53 (FIG. 4), reads a program for initial setting of the CPU 49 from the NAND flash memory 41, and stores the program in the RAM 53. The NAND controller 51 recognizes the program and data stored in the NAND flash memory 41 by executing this program, and initializes the CPU 49 (step S21).

  Next, the NAND controller 51 reads the firmware including the boot program from the NAND flash memory 41, expands it in the DRAM 43, and executes the firmware to start the CPU 49 (start the OS of the image forming apparatus 1). (Including) is completed (step S23).

  Next, the operation in the abnormal startup mode of the image forming apparatus 1 according to the present embodiment will be described mainly with reference to FIGS. 3, 4, 8, and 9. FIG. 8 is a flowchart for explaining the operation in the abnormal-time startup mode. FIG. 9 is a timing chart showing the operation in the abnormal startup mode.

  The USB memory 19 stores updated firmware. This firmware includes a program for initial setting of the CPU 49 and a boot program. Failed to update the pre-update firmware stored in the NAND flash memory 41 to the updated firmware stored in the USB memory 19, and the USB memory 19 is connected to the USB connector 13. Suppose that

  When the user presses the power button 23 (step T1), the power from the external power source 21 is supplied to the internal power source 15 and the internal power source 15 is activated (time t1), and a voltage is applied from the internal power source 15 to the long press detection circuit 17. Supplied. Thereby, the reset of the long press detection circuit 17 is canceled, and the timer 25 is activated (step T3: time t2). The process of step T1 and step T3 is the same as the process of step S1 and step S3. As described above, the timer 25 measures the first predetermined time (for example, 10 seconds) and the second predetermined time (for example, 13 seconds) longer than the first predetermined time.

  The long press detection circuit 17 monitors whether or not the power button 23 is pressed, and determines whether or not the time during which the power button 23 is pressed has reached the first predetermined time (step T5). If pressing of the power button 23 is stopped before the time when the power button 23 is pressed reaches the first predetermined time (No in step T5), the long press detection circuit 17 causes the long press of the power button 23 to be stopped. Is not judged (step T7). That is, the long press detection circuit 17 determines that the operation of the power button 23 is a normal power-on operation. Therefore, the long press detection circuit 17 maintains the L level without switching the output signal S1 (FIG. 3) from the L level to the H level. The subsequent processing proceeds to step S11 (FIG. 6) in the normal startup mode.

  On the other hand, when the long press detection circuit 17 determines that the time during which the power button 23 is pressed has reached the first predetermined time (Yes in step T5), the long press detection circuit 17 determines that the power button 23 is long pressed. (Step T9). Steps T5, T7, and T9 are the same as steps S5, S7, and S9.

  If the long press detection circuit 17 determines that the power button 23 is long pressed (step T9), the output signal S1 (FIG. 3) is switched from the L level to the H level (time t4).

  After step T9, when the time measured by the timer 25 exceeds the first predetermined time and reaches the second predetermined time (step T11), the internal power supply 15 supplies a voltage to the controller board 11 (time t5). ). Thereby, the reset of the CPU 49 is released (step T13). The process of step T11 and step T13 is the same as the process of step S11 and step S13.

  When the reset of the CPU 49 is released (step T13), the output signal S1 of the long press detection circuit 17 is at the H level, so the USB controller 55 is activated (step T15).

  The USB controller 55 determines whether the USB memory 19 is connected to the USB connector 13 (step T17). When the USB controller 55 determines that the USB memory 19 is not connected to the USB connector 13 (No in step T17), the subsequent processing proceeds to step S15 (FIG. 6) in the normal startup mode. Accordingly, even if the firmware update fails, if the boot program remains in the NAND flash memory 41, the CPU 49 is activated.

  When the USB controller 55 determines that the USB memory 19 is connected to the USB connector 13 (Yes in step T17), the USB controller 55 determines whether a boot program is stored in the USB memory 19 (step T19). ).

  If, for example, image data is stored in the USB memory 19 instead of the updated firmware, the USB controller 55 determines that the boot program is not stored in the USB memory 19 (No in step T19). Thereafter, the process proceeds to step S15 (FIG. 6) in the normal startup mode.

  When the USB controller 55 determines that the boot program is stored in the USB memory 19 (Yes in step T19), the following processing is performed. The USB controller 55 includes a RAM 57 (FIG. 4), reads a program for initial setting of the CPU 49 from the USB memory 19, and stores the program in the RAM 57. The USB controller 55 recognizes the program and data stored in the USB memory 19 by executing this program, and initializes the CPU 49 (step T21).

  Next, the USB controller 55 reads the firmware including the boot program from the USB memory 19, expands it in the DRAM 43, and executes the firmware, thereby starting the CPU 49 (including starting the OS of the image forming apparatus 1). Is completed (step T23).

  Next, the USB controller 55 determines whether or not the updated firmware is stored in the USB memory 19.

  If, for example, image data is stored in the USB memory 19 instead of the updated firmware, the USB controller 55 determines that the updated firmware is not stored in the USB memory 19 (No in step T25). . The process ends when the activation of the CPU 49 is completed.

  When the USB controller 55 determines that the updated firmware is stored in the USB memory 19 (Yes in step T25), the USB controller 55 stores the updated firmware stored in the USB memory 19 in the NAND type. The update is completed by writing to the flash memory 41 (step T27).

  The main effects of this embodiment will be described. This embodiment is premised on the case where the firmware including the boot program is updated using the USB memory 19 storing the updated version of the firmware instead of the network. If the update of the image forming apparatus 1 is interrupted during the update and the update fails, the user presses the power button 23 for a long time (step T9). As a result, the activation unit 61 shifts to the abnormal activation mode, reads the boot program included in the updated firmware stored in the USB memory 19 from the USB memory 19 and activates the OS of the image forming apparatus 1. (Step T15, Yes at Step T17, Yes at Step T19, Step T21, Step T23). Therefore, according to the present embodiment, when the update of the firmware including the boot program fails, the OS can be started without preparing a device for writing the boot program in the NAND flash memory 41.

  Further, according to the present embodiment, in the abnormal-time activation mode, the activation unit 61 accesses the USB memory 19 without accessing the NAND flash memory 41 and updates the update version stored in the USB memory 19. The boot program included in the firmware is read and the OS is activated (Yes in Step T15, Step T17, Yes in Step T19, Step T21, Step T23).

  If the update of the firmware including the boot program fails, the boot program stored in the NAND flash memory 41 may be destroyed, and as a result, the boot program stored in the NAND flash memory 41 may not be used. is there. In such a case, accessing the NAND flash memory 41 to read the boot program is a waste of time. Therefore, in the abnormal startup mode, the USB memory 19 is accessed without accessing the NAND flash memory 41, the boot program stored in the USB memory 19 is read, and the OS is started.

  Further, according to the present embodiment, after the boot unit 61 reads out the boot program included in the updated firmware stored in the USB memory 19 and starts the OS in the boot mode at the time of abnormality (step T15). In step T17, Yes in step T19, Step T21, Step T23), the rewriting unit 63 reads the updated firmware stored in the USB memory 19, and executes the firmware update again (in Step T25). Yes, step T27).

  Therefore, according to the present embodiment, the firmware can be automatically updated after the OS is started using the boot program stored in the USB memory 19.

1 Image forming device (an example of electronic equipment)
13 USB connector (example of interface)
17 Long press detection circuit (an example of a reception unit)
19 USB memory (an example of portable storage media)
23 power button 41 NAND type flash memory (an example of a non-volatile storage unit)
S1 Long press detection circuit output signal

Claims (3)

An electronic device that boots an OS using a boot program,
A non-volatile storage unit in which a predetermined program including the boot program is stored;
A boot unit that reads the boot program stored in the nonvolatile storage unit and starts the OS;
An interface unit to which a portable storage medium storing a predetermined version of the rewritten version is connected;
A reception unit for receiving a predetermined operation,
When the accepting unit accepts the predetermined operation in a state where the portable storage medium is connected to the interface unit, the activation unit shifts to an abnormal-time activation mode, and the portable storage medium The portable storage medium is read after the boot program included in the predetermined program of the rewritten version stored in the medium is read and the OS is started, and after the OS is started in the abnormal start mode An electronic device comprising a rewriting unit that reads the rewritten version of the predetermined program stored in the non-volatile storage unit and rewrites the predetermined program before rewriting to the rewritten version of the predetermined program . A power button for turning on the electronic device;
The reception unit measures a time during which the power button is pressed, and determines that the power button is long-pressed when a predetermined first predetermined time is reached. The electronic device according to claim 1, which is accepted as a predetermined operation.   If the reception unit determines that the power button has been stopped before reaching the first predetermined time, the activation unit shifts to a normal activation mode, and the nonvolatile storage unit The electronic device according to claim 2, wherein the boot program stored in the nonvolatile storage unit is read to start the OS.

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