Safety guide device and method for embedded system

Abstract

The invention provides a safety guide device for an embedded system, which comprises a loading module installed in a memory write protection region and is characterized in that the loading module comprises a first guide program module, a loading region operating system and a second guide program module; the first guide program module is used for initializing system hardware after starting up and then starting a loading region operating system; the loading region operating system is provided with a jump thread, and the jump thread is used for jumping the program to an initial address of the second guide program module after execution of other threads of the loading region operating system; and the second guide program module is used for initializing the system hardware again, and then a main operating system is started. In addition, the invention also provides a corresponding safety guide method. The invention can realize a plurality of complex functions at a safety guide phase. If an upper application program and a main operating system kernel are actively updated online, the invention fast displays a colorful start-up picture, realizes check step by step and the like.

Description

technical field [0001] The present invention relates to an embedded system, in particular, the present invention relates to a safe boot method for an embedded system. Background technique [0002] With the rapid development of network communication technology, chip technology and software technology, the application of embedded systems is becoming more and more extensive. Because of its extensive market demand prospects and huge commercial value, digital TV makes set-top boxes a wide application field of embedded systems. Currently, embedded operating systems mainly include Vxworks, Linux, WinCE, OS20, Psos, ​​u / COS-II, eCOS, etc. Among them, u / COS-II, eCOS, Linux, and Vxworks are the most widely used. The u / COS-II operating system is a real-time operating system with open source code. The kernel is designed and implemented according to the requirements of the real-time system, which is relatively simple. At the same time, u / COS-II has the characteristics of small code siz...

AI Technical Summary

Problems solved by technology

Therefore, online upgrades or repairs may not be possible when related upper-layer applications fail

In addition, since the upgrade-related information is placed outside the write-protected area of ​​Flash (such as figure 1 As shown, this figure is a schematic diagram of the Flash partition of the set-top box in the prior art), and the upgrade-related information is vulnerable to illegal damage (such as hacker attacks), causing the system to fail to upgrade normally

[0004] In addition, due to the relatively simple functions of the existing Loader, other complex functions cannot be realized during the secure boot phase.

For example, the existing Loader cannot verify the integrity of the Image data inside and outside the write-protected area step by step; the existing Loader cannot support a graphical interface, so the boot screen must be displayed after the Loader finishes running and the operating system is started, which causes the user to wait. The problem of too long and poor experience

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