Method for using dual code mirroring to run on an embedded device

Abstract

The method of using dual-code mirroring operation on the embedded device provides a low-cost method that meets the needs of embedded device program generation, loading, and running upgrades, and improves the safety and reliability of the program. The above method is through program compilation, production burning The process of adding a secondary code image to the image code storage area in the flash memory in addition to the main code image, so that the two code images can complement each other and upgrade each other. On the premise of reducing the flash space, when one of the code images is damaged Still able to work normally, and self-repair, thereby improving the safety and reliability of embedded devices. The auxiliary code image storage space is a minimum application system, which includes basic system functions, and is easy to maintain and upgrade. Compared with the previous method of cross-backup with direct double-backup flash, it saves up to half of the flash space, and the cost is lower. Very good value for money.

Description

technical field [0001] The present invention relates to the code image management technology in the flash memory of the embedded device. By improving the space structure of the flash memory, an auxiliary code image storage space is added as a supplement to the main code image storage space to ensure the safety and reliability of the program code of the embedded device, especially It is suitable for the equipment that the program code can be automatically upgraded through the network. Background technique [0002] In the prior art, program codes of embedded devices are generally stored in non-volatile memories such as flash memory. Initially, the program code was read-only, but due to the rapid development of technology, the code needs to be continuously updated, or because other data other than the program need to be saved, such as modifying the configuration, recording and rewriting the data related to operation. In the process of rewriting or upgrading, there may be power...

AI Technical Summary

Problems solved by technology

[0003] The existing technology has proposed a cross-dual backup mechanism, but it can no longer fully meet the needs

The main reason is that embedded devices have more and more functions, more and more complicated, and the code capacity is getting larger and larger. Nor flash may reach 8MB, 16MB, or even 32MB, and nand flash is even larger.

Therefore, the original dual backup technology requires twice the size of the flash, and the price difference from a single code image is obvious, which increases the cost of the flash a lot.

Profit margins for embedded devices are very low in many industries, so cost reduction has become an urgent issue

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