Multi-security-level software simultaneous operation method meeting DO178C standard

Abstract

The invention discloses a multi-security-level software simultaneous operation method meeting a DO178C standard, which comprises the following steps of: downloading low-security-level software and high-security-level software, and mirroring the low-security-level software and the high-security-level software to an appointed position of a storage chip; restarting airborne equipment, starting an ARMCortex-A series core of the airborne equipment, operating a system starting bootloader to initialize related equipment, starting the ARM Cortex-A series core and operating high-security-level software on the ARM Cortex-A series core; performing resource domain division on system resources by utilizing RDC, so that an ARM Cortex-A series core and an ARM CortexM4 series core only can correspondingly access equipment and resources of respective access domains; and when the high-security-level software system is started, starting the ARM CortexM4 series core, so that the high-security-level software starts to be executed on the ARM CortexM4 series core.

Description

technical field [0001] The invention relates to the technical field of aircraft airborne equipment, in particular to a method for simultaneously running multi-safety level software that meets the DO178C standard. Background technique [0002] DO-178C is the main basis for certification agencies such as FAA, EASA, and the Canadian Department of Transport to approve all aerospace systems containing commercial software. The DO-178C specification is the current general standard for airworthiness certification of airborne software. According to the DO-178C specification, airborne software is divided into DAL (Design assurance Level, hereinafter referred to as DAL) E, DAL D, and DAL due to different safety levels. DAL C, DAL B, DAL A five security levels. From DAL E to DAL A, the software security level increases successively. Among them, DAL A is the highest safety level, and the abnormality of DAL A level software may lead to catastrophic accidents of the aircraft, such as air...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to solve the problem of airworthiness when the low-safety level software and high-safety level software on the above-mentioned aircraft airborne equipment run together on the same physical CPU. For the problem of difficult certification, the present invention provides a method for simultaneously running multi-safety software that meets the DO178C standard to solve the above problems

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