A method of system startup based on pcm

Abstract

The present invention provides a system startup method based on PCM, comprising: Bootloader and kernel image are stored in PCM; Bootloader is executed on PCM, and readable and writable parts are allocated to DRAM during execution; Kernel image is executed on PCM , Allocate readable and writable parts to DRAM during execution. Use PCM to store and execute the Bootloader and kernel image. During execution, the readable and writable part is allocated to DRAM. Since the data segment that needs to be moved during startup accounts for less than one tenth of the Bootloader and kernel image, and the PCM The read delay is equivalent to that of DRAM, which can effectively reduce the system startup time and improve system efficiency.

Description

technical field [0001] The invention relates to the field of memory, in particular to a method for starting a system based on PCM. Background technique [0002] In recent years, with the rise of mobile terminal equipment, embedded technology has developed rapidly, especially the application of embedded Linux system is becoming more and more extensive. [0003] After the embedded system is powered on or reset, it will execute a startup program Bootloader to initialize the hardware and software environment, and then call the Linux kernel. Bootloader and Linux kernel images are generally stored in non-volatile memory such as Flash or disk, but due to the slow read and write speed of Flash or disk, Bootloader will move itself to DRAM to continue execution after executing a short program. After the environment, the Linux kernel image will be moved from the Flash to the memory and then the kernel will be invoked. Due to the slow read and write speed of the Flash or disk, the star...

AI Technical Summary

Problems solved by technology

Bootloader and Linux kernel images are generally stored in non-volatile memory such as Flash or disk, but due to the slow read and write speed of Flash or disk, Bootloader will move itself to DRAM to continue execution after executing a short program. After the environment, the Linux kernel image will be moved from the Flash to the memory and then the kernel will be invoked. Due to the slow read and write speed of the Flash or disk, the startup method needs to occupy memory for startup. At the same time, the transfer of the kernel will also increase the startup time.

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