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我使用C6748处理器的SATA接口，通过一个芯片连接两个SATA硬盘，但只能看到1个硬盘，不知道怎么实现Port Multiplier 功能的硬盘读写切换，请帮忙发个样例代码。
还是比较急的
哪位大侠有，多谢了
