CN103500128A - NVRAM data backup method - Google Patents
NVRAM data backup method Download PDFInfo
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- CN103500128A CN103500128A CN201310461075.5A CN201310461075A CN103500128A CN 103500128 A CN103500128 A CN 103500128A CN 201310461075 A CN201310461075 A CN 201310461075A CN 103500128 A CN103500128 A CN 103500128A
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Abstract
An NVRAM data backup method comprises the following steps: an address space is obtained in a FLASH through an application and used for backup of NVRAM data; when a system is started, NVRAM data are read from an NVRAM partition; whether the NVRAM data which are read currently are the same as the backup NVRAM data is judged through comparison; when the NVRAM data which are read currently are different from the backup NVRAM data, the NVRAM data which are read currently cover the backup NVRAM data. By the adoption of the NVRAM data backup method, when the system cannot be started normally due to the anomaly of the NVRAM data, the system can be started normally through the backup NVRAM data; moreover, the backup NVRAM data are updated continuously so that the backup NVRAM data can be the NVRAM data of last normal start all the time, and the instantaneity of the NVRAM data is guaranteed.
Description
Technical field
The present invention relates to the NVRAM technical field, particularly relate to a kind of nvram data backup method.
Background technology
Equipment normally starts initialization and uses some default configuration, in order to realize faster mutual and change that some are commonly used, is saved in the NVRAM subregion of FLASH than parameter more frequently.But, owing to operating frequently the NVRAM subregion and NOR FLASH first wipes the characteristic of writing afterwards, can cause unavoidably the NVRAM partition data to lose.Such as just encountering physics power down while writing the NVRAM subregion, and cause nvram data to be lost, be that the BOOT_PART parameter is also along with loss, at this moment because BOOT_PART current data value is lost, can't learn when equipment starts from that BOOT_PART next time and start and the generation mistake.
Summary of the invention
Based on this, be necessary to provide a kind of and avoid nvram data to lose and cause system to start wrong nvram data backup method.
A kind of nvram data backup method comprises:
Application space, plot location in FLASH, for backing up nvram data;
When system starts, from the NVRAM subregion, read nvram data;
Whether the more current nvram data read is identical with the backup nvram data;
When the current nvram data read is not identical with the backup nvram data, by the current nvram data read, cover the backup nvram data.
Preferably, also comprise, data exception or while manually causing system to be restarted, read out data from the NVRAM subregion and can find data exception when detecting, and now system reads nvram data from backup area and normally starts, and covers the NVRAM subregion.
After adopting the inventive method, method by the backup nvram data, in nvram data because extremely while causing system normally to start, by the backup nvram data, allow system normally start, and the present invention constantly updates the backup nvram data, make to back up always nvram data during last normal startup of nvram data, guaranteed the real-time of nvram data.
The accompanying drawing explanation
The process flow diagram that Fig. 1 is an embodiment provided by the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is described in more detail.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Consult Fig. 1, the nvram data backup method of an embodiment provided by the invention comprises:
Step S1, application space, plot location in FLASH, for backing up nvram data;
In FLASH, except the NVRAM subregion, application space, plot location, be specifically designed to the backup nvram data.
Step S2, when system starts, read nvram data from the NVRAM subregion;
When system starts, system reads nvram data from the NVRAM subregion, and equipment normally starts some default settings that initialization is used, and the NVRAM subregion is to compare parameter more frequently for special storage modification.
Step S3, whether the more current nvram data read is identical with the backup nvram data;
Step S4, when the current nvram data read is not identical with the backup nvram data in step S3, cover the backup nvram data by the current nvram data read.When the current nvram data read from the NVRAM subregion is not identical with the backup nvram data, illustrate that nvram data has change, at this moment cover the backup nvram data by the current nvram data read, the backup nvram data has obtained renewal, has guaranteed the real-time of backup nvram data.
Step S5, data exception or while manually causing system to be restarted, read out data from the NVRAM subregion and can find data exception when detecting, and now system reads nvram data from backup area and normally starts, and covers the NVRAM subregion.
After adopting the inventive method, method by the backup nvram data, in nvram data because extremely while causing system normally to start, by the backup nvram data, allow system normally start, and the present invention constantly updates the backup nvram data, make to back up always nvram data during last normal startup of nvram data, guaranteed the real-time of nvram data.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (2)
1. a nvram data backup method, is characterized in that, comprising:
Application space, plot location in FLASH, for backing up nvram data;
When system starts, from the NVRAM subregion, read nvram data;
Whether the more current nvram data read is identical with the backup nvram data;
When the current nvram data read is not identical with the backup nvram data, by the current nvram data read, cover the backup nvram data.
2. nvram data backup method according to claim 1; it is characterized in that; also comprise; data exception or while manually causing system to be restarted; read out data from the NVRAM subregion and can find data exception when detecting; now system reads nvram data from backup area and normally starts, and covers the NVRAM subregion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310461075.5A CN103500128A (en) | 2013-09-30 | 2013-09-30 | NVRAM data backup method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310461075.5A CN103500128A (en) | 2013-09-30 | 2013-09-30 | NVRAM data backup method |
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| CN103500128A true CN103500128A (en) | 2014-01-08 |
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| CN201310461075.5A Pending CN103500128A (en) | 2013-09-30 | 2013-09-30 | NVRAM data backup method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105938445A (en) * | 2015-07-31 | 2016-09-14 | 杭州迪普科技有限公司 | Data backup method and device |
| CN106503542A (en) * | 2016-10-14 | 2017-03-15 | 青岛海尔空调器有限总公司 | The anti-Improvement of device parameter, equipment and air-conditioner |
| CN106933545A (en) * | 2015-12-29 | 2017-07-07 | 阿里巴巴集团控股有限公司 | Application system and its starting protection method and device |
| CN113495746A (en) * | 2021-05-31 | 2021-10-12 | 杭州华橙软件技术有限公司 | Program upgrading method, device, medium and electronic equipment |
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| CN105938445A (en) * | 2015-07-31 | 2016-09-14 | 杭州迪普科技有限公司 | Data backup method and device |
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| CN106933545A (en) * | 2015-12-29 | 2017-07-07 | 阿里巴巴集团控股有限公司 | Application system and its starting protection method and device |
| CN106933545B (en) * | 2015-12-29 | 2020-09-29 | 阿里巴巴集团控股有限公司 | Application system and start protection method and device thereof |
| CN106503542A (en) * | 2016-10-14 | 2017-03-15 | 青岛海尔空调器有限总公司 | The anti-Improvement of device parameter, equipment and air-conditioner |
| CN106503542B (en) * | 2016-10-14 | 2020-11-27 | 青岛海尔空调器有限总公司 | Equipment parameter rewriting prevention method, equipment and air conditioner |
| CN113495746A (en) * | 2021-05-31 | 2021-10-12 | 杭州华橙软件技术有限公司 | Program upgrading method, device, medium and electronic equipment |
| CN113495746B (en) * | 2021-05-31 | 2024-02-02 | 杭州华橙软件技术有限公司 | Program upgrading method, device, medium and electronic equipment |
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