Linux embedded device and the method for switching between user mode and engineering mode
An embedded device, engineering mode technology, applied in the direction of program startup/switching, multi-programming device, etc., can solve the problems of not easy super-authority interface, inconvenient use, etc., to achieve simple and feasible operation, increase equipment cost, and easy to use Effect
Active Publication Date: 2016-01-06
深圳市九思泰达技术有限公司
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Problems solved by technology
[0005] The present invention provides a Linux embedded device and a method for switching between a user mode and an engineering mode thereof in order to solve the technical problem that it is not easy to enter the super authority interface of an embedded device using the Linux operating system and inconvenient to use in the prior art
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[0024] See figure 1 . The startup sequence of Linux embedded equipment of the present invention is:
[0025] 1. Power on the CPU;
[0026] 2. The first-order bootloader solidified inside the CPU starts;
[0027] 3. The U-BOOT unit starts;
[0028] 4. The Linux kernel unit starts;
[0029] 5. Start the application specified by the script.
[0030] Because the external interfaces of Linux embedded devices are simple, there are generally only limited input and output interfaces such as display, keys, and USB interfaces. The invention detects whether a specific key is pressed when the system is started to enter different system operation modes. Enter engineering mode if a specific key is pressed. Enter user mode if the specified key is not pressed. As for which specific key is the key, you can define it yourself.
[0031] See figure 2 . The method for switching between user mode and engineering mode of Linux embedded equipment of the present invention comprises the fol...
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The invention discloses Linux embedded equipment and a switching method between a user mode and an engineering mode, aiming to provide a method capable of quite conveniently entering the engineering mode. The Linux embedded equipment comprises keys. The method comprises the steps of: starting a U-BOOT unit, detecting whether a specific key set to be capable of entering the engineering mode is pressed, if so, invoking an environment variable setting function and setting a flag variable to be 1, otherwise, invoking the environment variable setting function, setting a flag variable to be 0, and storing the flag variable in an independent subregion of FLASH; and starting a Linux kernel unit, and reading the flag variable stored in the independent subregion; and if the flag variable is 0, setting to be an ordinary permission and entering the user mode, and if the flag variable is 1, setting to be a super permission and entering the engineering mode. The invention also discloses the Linux embedded equipment. The method can be applied to various kinds of Linux embedded equipment.
Description
technical field [0001] The invention relates to an embedded device using a Linux operating system, in particular to a method for switching between a user mode and an engineering mode of a Linux embedded device. Background technique [0002] With the increasingly powerful chip functions and the decline in the price of electronic components, more and more embedded devices have adopted the Linux operating system. The external interfaces of embedded devices are simple, and generally only limited input and output interfaces such as display, keys, and USB interfaces interact with users. The users of embedded devices are divided into two categories: one is the user function user, who enters the user function interface by default after the device is turned on, and the authority is limited, and can only run the functions provided under this interface; the other is the engineering user. Maintenance personnel, after the device is turned on, can have super operation authority to run al...
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Inventor 黄超崔若起
Owner 深圳市九思泰达技术有限公司