本文介绍了Bootloader的概念，它是操作系统启动前运行的一段代码，用于引导其他操作系统启动，每个操作系统通常都有特定的Bootloader。Bootloader包含多种方式来引导操作系统内核，并提供调试和修改内核环境的命令。由于其在开机或重启后最先运行，因此高度依赖于处理器和硬件板卡。
bootloader引导加载程序
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Bootloader is a piece of code that runs before any operating system is running.
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Bootloader are used to boot other operating systems, usually each operating system has a set of bootloaders specific for it.
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Bootloaders usually contain several ways to boot the OS kernel and also contain commands for debugging and/or modifying the kernel environment.
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Since it is usually the first software to run after powerup or reset, it is highly processor and board specific.
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