BSP是板级支持包，是介于主板硬件和操作系统之间的一层，应该说是属于操作系统的一部分,主要目的是为了支持操作系统，使之能够更好的运行于硬件主板。BSP是相对于操作系统而言的，不同的操作系统对应于不同定义形式的BSP,例如 VxWorks的BSP和Linux的BSP相对于某一CPU来说尽管实现的功能一样，可是写法和接口定义是完全不同的，所以写BSP一定要按照该系统 BSP的定义形式来写（BSP的编程过程大多数是在某一个成型的BSP模板上进行修改）。这样才能与上层OS保持正确的接口，良好的支持上层OS。 例如： 在VxWorks中的网卡驱动，首先在config.h中包含该网卡，然后将网卡含网卡的信息的参数放入数组 END_TBL_ENTRY endDevTbl [] 中，系统通过函数muxDevLoad( )调用这个数组来安装网卡驱动。 而在Linux中的网卡驱动，是在space.c中声明该网络设备，再把网卡驱动的一些函数加到dev结构中，由函数ether_setup（）来完成网卡驱动的安装。

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