Method and system for reasonably using memory of display buffer

Abstract

The invention provides a method for reasonably using a memory of a display buffer. The method for reasonably using the memory of the display buffer includes the following steps that 1, a boot loader applies a memory 1 according to the size of a picture to be displayed, and saves picture data in the memory 1; 2, the address of the memory 1 is marked as 'unavailable', and an operation system removes the memory 1 marked as 'unavailable' by the boot loader from a memory pool of the operation system in a memory initialization phase; 3, an LCD (liquid crystal display) controller drive of the operation system obtains a memory 2 needed by display buffering of a current frame according to screen distinguishing rate, and informs a memory manager of the operation system; 4, the memory manager performs a comparison according to the needed memory 2 and the memory 1 so as to execute supplementation or memory recycle. The method for reasonably using the memory of the display buffer high elastically displays the frame data buffer memory in recoverable and supplementary mode, and improves use rate of internal storage of the operation system.

Description

technical field [0001] The invention relates to the technical field of embedded devices, in particular to a method and system for rationally utilizing display buffer memory. Background technique [0002] Many of the current embedded devices need to display a picture during the bootloader guidance phase, and the picture also needs to continue to be displayed during the initialization phase of the operating system. The bootloader will assign a memory address storing the picture data to the display frame buffer address of the LCD controller, and the LCD controller will obtain the picture data from the address for display. Then, when the operating system is initialized, the memory used by the bootloader to store and display images is mistakenly used for other purposes, resulting in the modification of the LCD output data during the operating system initialization phase, which appears as a blurred screen. To cope with this problem, several techniques are currently in common use....

AI Technical Summary

Problems solved by technology

[0003] The first method is to turn off the backlight during the initialization stage of the operating system, and then turn on the backlight for image display after the LCD controller driver of the operating system is initialized. This method will result in discontinuous image display and poor user experience.

[0004] The second method is to modify the memory mapping relationship of the operation topic, so that the operating system does not use the memory area used by the bootloader to save image data during the initialization phase. Although this method can solve the problem, the operation is very complicated and needs to be initialized. Configure two MMU tables in the phase and non-initialization phase, and configure them separately, which can easily lead to system exceptions

However, the bootloader and the operating system mentioned in this invention open up different display frame buffer memories respectively to copy the picture data; The first display memory is used for other purposes, resulting in blurred screen)

[0006] The fourth technology is to open up an independent physical memory control. This space is only configured for LCD during the life cycle of the bootloader and operating system, but this creates a problem. The operating system needs to target different screens and resolutions. Open up different sizes of display frame buffer memory, if the image displayed in the bootloader is very large (it needs to open up a large memory to save the image), but the image to be displayed in the operating system is small, then this memory Wasted (the OS can't use the extra part)

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