Fault-tolerant guide method applied to SPARCV8 structure computer

Abstract

The invention discloses a fault-tolerant guide method applied to an SPARCV8 structure computer which can be used for quickly and reliably starting an embedded operating system of a satellite borne computer. The satellite borne computer is provided with a CPU (central processing unit) with an EDAC (error detection and correction) function, an antiradiation RPOM and EEPROMs (electrically erasable programmable read-only Memories), wherein the PROM is used for storing a guide program; the EEPROMs are two or more than two continuous storage media in the address and two or more than two separated storage media in physics, and each EEPROM stores one backups of mapping files in an operating system; the CPU operates the guide program in the PROM at first, and the guide program reads a first backupof the mapping file in the operating system from the EEPROM and then uses the EDAC function of the CPU to correct 1-dislocation and detect 2-dislocation; if the 2-dislocation exists, a second backup in the EEPROM is read, and the rest may be deduced by analogy; and if all the backups can not be read normally, the exception handling is executed.

Description

technical field [0001] The invention relates to a guidance technology of an aerospace computer, in particular to a fault-tolerant guidance method applied to a computer with a SPARCV8 structure. Background technique [0002] In satellite applications, more and more embedded onboard computers use operating systems to handle complex business management. Before the device is started, the operating system files are stored in the corresponding hardware memory. After the device is powered on, the operating system is directly booted. Therefore, the successful booting and running of the operating system is the key to the on-board computer performing on-board tasks. However, the space radiation environment is still one of the bottlenecks restricting the development of space-borne embedded computers. Therefore, in satellite applications, the fault tolerance and reliability of embedded devices are particularly important. [0003] In the current embedded on-board computer, the operating...

AI Technical Summary

Problems solved by technology

However, the capacity of PROM is generally only a few kilobytes, and multiple chips are needed to meet the needs of embedded real-time operating systems and application programs, and the cost is greatly increased. The practice of storing all programs in PROM can no longer adapt to embedded onboard computer development

EEPROM or Flash memory has a large single-chip capacity, up to several Mbytes, which can meet the requirements of embedded onboard computers. However, due to the influence of space radiation in space applications, EEPROM or Flash memory has the phenomenon of single event flipping. It will cause the stored data to change, which will cause the operation error of the on-board computer, and cause the device to fail to start normally

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