Method for recovering flash memory data at power-off of built-in Linux system

Abstract

A method for recovering flash data in the event of power-off in an embedded Linux system solves the problem that sudden power-off at the time of read and write data flashing causes the defects of data loss or file system damage. The invention adopts the technical scheme as follows: defining and dividing a root file system in the flash memory into a fixation area, a modification area and a backup area; giving deferent loading manners to the subareas through a system file JFFS2; distributing configuration information in the root file system to the catalogues in the fixation area; and storing the temporary file produced during the system operation in the root file system in the memory. When data loss is caused by accidental power-off of the file system, the Linux system transfers the file system in spare subarea to carry out recovery of default setting and judges whether the current file system is damaged or not; whether to continuously conduct file loading to the file system is decided according to the detection to the system file with important parameters of system setting. The invention has the beneficial effects that the data recovery to the flash in the event of power-off is realized, and data loss in flashing process is avoided.

Description

technical field [0001] The invention relates to a flash memory recovery data setting method, in particular to a method for restoring flash memory data when power is off in an embedded Linux system. Background technique [0002] The file system running on the flash memory in the prior art generally adopts a flash conversion layer provided between the file system and the flash memory, and its function is to simulate the underlying flash memory into a standard block device with 512-byte sectors, and simulate One-to-one mapping of the block device to the flash memory, for the file system, just like working on a common block device. The JFFS2 file system can improve the erasing efficiency of flash memory and reduce wear and tear through the log structure storage method and garbage collection mechanism. It has certain fault-tolerant processing and is often used as a conversion layer in embedded Linux systems. In some solutions of embedded Linux systems , the flash file system usu...

AI Technical Summary

Problems solved by technology

The JFFS2 file system can improve the erasing efficiency of flash memory and reduce wear and tear through the log structure storage method and garbage collection mechanism. It has certain fault-tolerant processing and is often used as a conversion layer in embedded Linux systems. In some solutions of embedded Linux systems , the flash file system usually has only one partition, that is, the root file system, and this file system is loaded in a readable

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