CN1928820A - Embedded system and its upgrading method - Google Patents
Embedded system and its upgrading method Download PDFInfo
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- CN1928820A CN1928820A CN 200610021985 CN200610021985A CN1928820A CN 1928820 A CN1928820 A CN 1928820A CN 200610021985 CN200610021985 CN 200610021985 CN 200610021985 A CN200610021985 A CN 200610021985A CN 1928820 A CN1928820 A CN 1928820A
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Abstract
The related embedded system update method comprises: without writing driver or network protocol to expand the bootloader, adding a reduced software update module in the FLASH to download the update software. This invention can update system during the bootstrap stage without added cost, and can provide system recovery function to improve security and maintenance, and has great social and economic benefits.
Description
Technical field
The present invention relates to embedded system technology, particularly a kind of technology of upgrading that in embedded system bootstrap program, realizes.
Background technology
Embedded software system is owing to have operating system and numerous driver, protocol stack and application programs, and system is comparatively complicated, thereby becomes fragile, program error takes place easily and constantly upgrading.
System bootstrap routine (bootloader) is first section software code of embedded system electrifying startup operation, is before operating system nucleus or user application operation, a cross-talk program of operation.By this section program, initiating hardware equipment, set up the mapping graph of memory headroom, so that be ready to correct environment for final call operation system kernel or user application.Promptly the system bootstrap module links to each other with operating system in embedded system, the operation of pilot operationp system.
Built-in system software generally is burnt among the FLASH by EJTAG debugger or programmable device when manufacturing experimently or produce by the equipment development merchant, and its bootloader function is very weak.Though existing embedded system includes RS232 serial ports, network interface, AKU storage unit, but system realizes system upgrade as desiring in boot, must additionally in boot, write a large amount of software codes, increase modules such as network port driving, http protocol stack.System bootstrap module after expanding can be communicated by letter with RS232 serial ports, network interface respectively by operating system, and the upgrade software of downloading is kept at the AKU storage unit.But because different platform hardware structure difference, software will be done a lot of transplanting work, and its workload is bigger, and this class methods complicated operation and upgrade software speed are slower, have brought inconvenience to product development merchant and user.
Summary of the invention
Technical matters to be solved by this invention is: provide a kind of under the situation that does not expand bootloader, allow system can pass through the embedded system and the upgrade method thereof of http, tftp agreement downloaded software realization system upgrade.
The present invention is that the technical scheme that solves the problems of the technologies described above employing is:
Embedded system comprises system bootstrap module, operating system, RS232 serial ports, network interface, AKU storage unit; Increased a software upgrading module, operating system links to each other with the system bootstrap module; The software upgrading module also links to each other with the system bootstrap module; The software upgrading module also links to each other with RS232 serial ports, network interface, AKU storage unit respectively.
By in FLASH, increasing a software upgrading module, this software upgrading module is the operating system after reducing, come download and upgrade software by this software upgrading module, need not write driver and procotol again in bootloader, existing driver and procotol are come download and upgrade software in the operating system after promptly directly utilization is reduced.
The present invention also provides the upgrade method of this embedded system: detect upgrade request whether occurs earlier in time delay during the software upgrading module starts, if then normally do not start; If have then to enter the software upgrading module, carry out ROMPaq and download, write FLASH.Its concrete steps are as follows:
A, embedded system power on, and operational system boot, system boot are finished the initialization of hardware and loaded relevant hardware drive program;
Whether b, judgement have upgrade request in time delay, if not, enter step c; If enter steps d;
C, start the operating system;
D, startup software upgrading module, the software upgrading module is provided with network parameter, and communicates by letter with upgrade server by network interface, and upgrade file is downloaded to FLASH, and upgrading finishes and gets back to step a.
The invention has the beneficial effects as follows: use embedded system of the present invention to carry out software upgrading, increase a function of strengthening boot through the software upgrading module after the operating system reduction, realized finishing system upgrade in the vectoring phase, save workload greatly, shortened the Products Development cycle.The software upgrading module of reducing is very little, does not increase system cost, and also can provide the system recovery function when host file system damages, and has improved security, helps the subsequent upgrade and the maintenance of software, and bigger social benefit and use value are arranged.
The present invention will be further described below in conjunction with accompanying drawing and embodiment.
Description of drawings
Fig. 1 is the embedded system synoptic diagram;
Fig. 2 is the upgrading process flow diagram of embedded system.
Embodiment
Be example with the PNX8550 development platform below, adopt PHILIPS PNX8550 development board, transplanted linux operating system, associated drives and application software are finished substantially, a basic bootloader is arranged, this bootloader has only uart to drive and nand FLASH drives, and allow this bootloader support file download function need write network interface card driving and TCP/IP, tftp, http agreement, and workload is big and be not easy to transplanting.
The linux kernel had just comprised network interface card driving and TCP/IP, tftp, http agreement originally, cutting linux kernel, generate a software upgrading module that is used for download and upgrade software specially, comprise that network card chip drives, FLASH reads and writes driving, RS232 serial port drive etc., constitute an embedded minimum system, will be connected, download the irrelevant process module of preservation with network and reduce.
Operating system is only used static module without the dynamic module storehouse, and file system adopts initramfs, network interface card drives and adopts static mode to connect into kernel, and the rootfs file system adopts the busybox compiling, only keeps the httpget program, be compiled into vmlinux, compress with gzip again.
Further reduce, make first process init that carries out into http and download, remove shell programs such as bash, init.
Further reduce again, transform the linux actuating section, linux is started thread init make the http download thread into, remove the rootfs file system.
Last final reduction operating system later, i.e. the software upgrading module of keeping of FLASH.Utilize this software upgrading module download and upgrade software to FLASH, realize system upgrade.As shown in Figure 1, form dual system bootloader, removing operating system and the system bootstrap module linking to each other, the software upgrading module also links to each other with the system bootstrap module in addition; The software upgrading module also links to each other with RS232 serial ports, network interface, AKU storage unit respectively.The FLASH allocation of space such as the following table of above-mentioned embedded system:
| Program | The address | Size |
| bootloader | 0x00000000～0x00040000 | 256K |
| The software upgrading module | 0x00040000～0x00300000 | 2M-256K |
| Operating system | 0x00300000～0x01000000 | 2M-64M |
So just need in bootloader, not write related driver programs, embedded system utilizes driving and the procotol in the software upgrading module to come download and upgrade software, can also utilize the LCD in the driving to drive the progress of downloading, write FLASH with the graphics mode software for display, not only shortened the construction cycle, and it is powerful, http downloads can pass through proxy, can show the download progress figure.
Compact operating system also can remove all no functions with other smaller system such as systems such as ucDOS, pSos, only keeps the http download and writes the FLASH program, compresses with gzip.
As shown in Figure 2, the upgrading flow process for embedded system is as follows:
Behind the embedded system electrification reset, at first move bootloader, this program is mainly finished the initialization of hardware and is loaded relevant hardware drive program.After the bootLoader initialization finishes, add 3 seconds software delay by software control, judge that a RS232 serial ports has or not the button of request upgrading to press in the section between at this moment, if do not have, time delay to after start the operating system immediately, carry out normal boot.Receive corresponding upgrade function request key as if RS232 serial ports in time delay and pressed, entered the software upgrading flow process at once.By being set, network parameter (this machine address, server address, MAC Address, the network transmission protocol etc.) comes to interconnect with upgrade server.Be provided with and press upgrading beginning function key after the end and begin software upgrading, successfully then turn back to the power-up initializing state and restart system if upgrade.
Upgrading software generally comprises the driving revision program of operating system or two aspects of value-added service software of application.
Claims (8)
1, embedded system comprises system bootstrap module, operating system, RS232 serial ports, network interface, AKU storage unit, it is characterized in that, also comprises the software upgrading module, and described software upgrading module links to each other with described system bootstrap module; Described software upgrading module links to each other with described RS232 serial ports, described network interface, described AKU storage unit respectively.
2, embedded system as claimed in claim 1 is characterized in that, described system bootstrap module, operating system, AKU storage unit, software upgrading module all are built among the FLASH.
3, embedded system as claimed in claim 1 or 2 is characterized in that, described software upgrading module comprises that network card chip drives, the FLASH read-write drives, the RS232 serial port drive.
4, its upgrade method of embedded system according to claim 1 may further comprise the steps:
A, embedded system power on, and operational system boot, system boot are finished the initialization of hardware and loaded relevant hardware drive program;
Whether b, judgement have upgrade request in time delay, if not, enter step c; If enter steps d;
C, start the operating system;
D, startup software upgrading module, the software upgrading module is provided with network parameter, and communicates by letter with upgrade server by network interface, and upgrade file is downloaded to FLASH, and upgrading finishes and gets back to step a.
As the upgrade method of embedded system as described in the claim 4, it is characterized in that 5, described software upgrading module is the operating system after reducing, comprise that network card chip drives, the FLASH read-write drives, the RS232 serial port drive.
6, as the upgrade method of embedded system as described in claim 4 or 5, it is characterized in that described software upgrading module is kept on the described FLASH.
7, as the upgrade method of embedded system as described in the claim 6, it is characterized in that, described step b, described upgrade request is imported by the RS232 serial ports.
8, as the upgrade method of embedded system as described in the claim 7, it is characterized in that described network parameter comprises this machine address, server address, MAC Address, the network transmission protocol.
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| CNB2006100219851A CN100561433C (en) | 2006-09-30 | 2006-09-30 | Embedded system and upgrade method thereof |
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| CNB2006100219851A CN100561433C (en) | 2006-09-30 | 2006-09-30 | Embedded system and upgrade method thereof |
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| CN102214106A (en) * | 2010-04-08 | 2011-10-12 | 三星电子（中国）研发中心 | Automatic dual-system guide method of embedded device |
| CN102541585A (en) * | 2011-11-11 | 2012-07-04 | 深圳市迪威新软件技术有限公司 | Remote upgrade method and embedded system |
| CN102799452A (en) * | 2012-06-29 | 2012-11-28 | 深圳市安普尔科技有限公司 | Method and device for upgrading system software |
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| CN101477471B (en) * | 2009-01-07 | 2014-04-30 | 杭州海康威视数字技术股份有限公司 | Embedded system firmware on-line upgrading method |
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| CN105204896A (en) * | 2015-09-08 | 2015-12-30 | 江苏绿扬电子仪器集团有限公司 | BootLoader design method of digital storage oscilloscope |
| CN105278410A (en) * | 2015-10-26 | 2016-01-27 | 广东威创视讯科技股份有限公司 | Minimum system automatic embedding method, device and system |
| CN103761129B (en) * | 2014-01-13 | 2017-04-12 | 中南大学 | Method of implementing SDIO (secure digital input/output) interface drive in Boot loader layer |
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| CN102214106A (en) * | 2010-04-08 | 2011-10-12 | 三星电子（中国）研发中心 | Automatic dual-system guide method of embedded device |
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