Scroll to your UART's line, and enter 0xa0000000 in the Base address field (this was the default address for the 16550 UART you just deleted, so you know it's a safe place to put the lite UART).
滚动到uart行，在Base Address字段中输入0xa0000000(这是刚删除的16550 UART的默认地址，因此可知这是存储小uart的安全位置)。
Called to determine the base address of a structure whose type is known when the caller has a pointer to a field inside such a structure.
调用该宏计算出已知类型、已有一个域(成员)的指针的结构体的基地址。
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