Safety starting method preventing central processing unit (CPU) from self locking

A safe boot and self-locking technology, which is applied in the direction of program loading/starting, response error generation, redundant code error detection, etc., can solve problems such as the inability to judge whether the firmware is damaged, and the difficulty in identifying the correctness of the firmware, so as to avoid booting self-locking effect

Inactive Publication Date: 2012-08-01
SHANDONG SINOCHIP SEMICON
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Problems solved by technology

Obviously, unless it is a professional, it will be very difficult to identify the correctness of the firmware, and it is even more impossible to judge whether the firmware

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  • Safety starting method preventing central processing unit (CPU) from self locking

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[0024] Refer to the instructions attached figure 1 In order to express it more clearly, the flowchart shown in Figure 1 is described by the hardware structure and firmware structure of the embedded system, and the dashed arrow is used to introduce the parameters stored in the firmware information description header as the basis for judgment.

[0025] Define a method. When the downloaded firmware does not correspond to the hardware platform of the embedded system, the new firmware can still be downloaded without causing the corresponding hardware device to be scrapped; when the storage device (NAND Flash, and non-flash memory, flashing When a type of memory) is partially damaged and the stored firmware is damaged, the online update can still be performed again. Therefore, it can effectively prevent the CPU from running uncorresponding firmware or damaged firmware from causing self-locking when the system is started. Therefore, the firmware can be loaded safely and effectively to c...

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Abstract

The invention discloses a safety starting method preventing a central processing unit (CPU) from self locking. In an embedded system, a storage space is explored in a flash memory to store a plurality of firmware mirror images. System initialization is carried out, a firmware is searched in the storage space to be loaded on a system on chip, if the firmware is searched, correctness and integrity of the searched firmware are judged, and the firmware is operated when the conditions of the correctness and the integrity are met simultaneous; if the firmware is not searched, a next firmware is searched in the storage space; if the firmware is not searched in the storage space or if correct and integral firmware is not searched in the storage space, a flow of firmware loading failure is switched into. By means of the safety starting method preventing the CPU from self locking, self locking of the CPU is effectively avoided through exactness identification of the firmware and judgment of damage or not.

Description

technical field [0001] The invention relates to a safe starting method for preventing CPU self-locking. Background technique [0002] According to the definition of IEEE (Institute of Electrical and Electronics Engineers), embedded systems are "devices used to control, monitor, or assist the operation of equipment, machinery or plants" (devices used to control, monitor, or assist the operation of equipment, machinery or plants) . Embedded systems are actually a combination of software and hardware, and can also include accessories such as machinery. At present, a generally accepted definition in China is: a special computer system centered on applications, based on computer technology, software and hardware can be tailored, and adapted to the strict requirements of application systems on function, reliability, cost, volume, and power consumption. [0003] The software in an embedded system is usually solidified and is called firmware (Firmware). Firmware acts as the softw...

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Application Information

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IPC IPC(8): G06F9/445G06F11/10
Inventor 卢方勇李峰张洪柳赵阳
Owner SHANDONG SINOCHIP SEMICON
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