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AM5728 PCIE RC模式不支持8位的读写?

Other Parts Discussed in Thread: AM5728

AM5728 PCIE使用RC模式,外接PCIE转串口芯片,目前可以看到串口芯片的设备号和ID等参数(这些寄存器都是32位的),但是读写串口寄存器时返回的数据都是0,修改驱动使用readl没有问题,但是使用readb返回的数据都是0,是因为AM5728的PCIE不支持8位的读写方式?32位的操作方式不向下兼容?