Boot Loader,a sect of codes which runs before the OS core and the application process,initializes processor and other circuits around,and builds the mapping of memory space,including the stack of system and the sect of loading parameter of the system.Also,it takes the environment of the hardware and the software into a suitable state.Boot Loader can be loaded from not only the ROM or FLASH,but also the internet,in order to boot the OS or the application process finally.As a rule,Boot Loader is designed and carried out relying on hardware extremely; and each CPU system configuration has different Boot Loader,so it’s hard to build a current one.When the embedded system is constructed on the end board,some modification of the codes of the Boot Loader and the Linux core should be made to fit the configure of the hardware correspondingly and the need of embedded application,so that to build a compatible embedded Linux system.
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