Embedded system starting method based on BootRom function extension

Abstract

The invention discloses an embedded system starting method based on BootRom function extension, and relates to the technical field of chips, the method comprises the steps that an extension module is read from an external memory through BootRom and loaded into a memory, and the extension module internally comprises an operation instruction of an extension program; analyzing the extension module, running the operation instruction, and executing an extension program contained in the extension module; and after the extension program contained in the extension module is executed, returning to continue to execute the BootRom program. According to the method, an extension program is compiled into a module to be stored in an external storage device through a software relocatable code compiling technology, function extension of the BootRom is achieved in a mode of loading and running the program module, configuration information can be replaced to achieve more complex logic, dynamic adjustment of the BootRom execution process can be achieved, and the execution efficiency of the BootRom is improved. And the function expansion can be realized more flexibly in a program writing mode.

Description

technical field [0001] The invention relates to the field of chip technology, in particular to an embedded system startup method based on BootRom function expansion. Background technique [0002] BootRom is a small piece of read-only memory inside the embedded processor chip, which contains the first code executed when the processor is powered on or reset, and is used to jump to the next level of code after basic initialization of the chip. In modern embedded processors, BootRom usually implements more complex functions, mainly including the following parts: [0003] 1. Chip configuration, BootRom can read the configuration information on the hardware fuse or storage device, and make different configurations for the chip at startup; [0004] 2. Loading program, BootRom reads the next-level program on the mass storage device, usually the chip firmware, directly runs or loads into RAM to run, embedded processor with security function, BootRom will also run the firmware before...

AI Technical Summary

Problems solved by technology

[0006] With the development of embedded chip technology and application requirements, BootRom needs to implement more and more complex software functions, but limited by the manufacturing technology and cost of embedded chips, BootRom usually does not have a large code capacity. It limits the software function realization of BootRom, and due to the physical characteristics of BootRom, it cannot be modified after the chip is manufactured, and the functions implemented by the code in BootRom cannot be modified.

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