Method for maintaining system data without switching off power supply

Abstract

The present invention discloses a system data saving method under uninterrupted power. After a warm start, with the application system program operating normally, system data are output reliably before the reboot. Applied to an embedded system using SDRAM, the method includes the following procedures: (a) a storage space in SDRAM is allocated as an information record area; (b) the system data which should be stored into the information record area by a system data operation system program is stored, the data in the information record area is cached and processed so that the system data can be written in physical memory; (c) a memory address range for the BOOT program and application system program of the system are configured to make sure that only the system data operating program of the application system program can write in the information record area; (d) after system resetting, when the application system program runs normally, the system data of the information record area is output.

Description

technical field [0001] The invention relates to the field of embedded design, in particular to a method for realizing saving system data under continuous power by combining software and hardware. Background technique [0002] In an embedded system, it basically consists of an embedded hardware system and an embedded software system. The running time of an embedded system is an important indicator of system stability, but even for an embedded system with high reliability, some environmental problems and design defects may occur in actual operation, resulting in system reset. Embedded systems are generally unattended systems. When a reset occurs, effective means need to be provided. From the relevant information, it can be analyzed which reset the system belongs to and what the state of the system is before the reset, and then further analysis and improved design. [0003] There are various reasons for system reset, including abnormal software address reset, invalid command r...

AI Technical Summary

Problems solved by technology

[0005] Chinese patent application "method for keeping synchronous dynamic random access memory to store information" (application number 03146159.X) is a method of saving data under continuous power supply, but because the BOOT or BIOS program space is limited and the function is relatively simple, so only It can output relatively original information, and the output method is relatively simple and may be unreliable. Generally, only the serial port or network port is used to print out the system data before restarting, which cannot be saved.