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DM8168 GPIO设置

我在u-boot中将GP0[0]和GP0[1]设置为输入引脚(这两个引脚PINMUX值有一个,就是作为GPIO使用),然后启动内核,内核启动后查看GP0的输入输出控制寄存器,GP0[0]和GP0[1]都变成了输出引脚。通过测试发现去掉SmartReflex class2 support for ti816x这个内核配置项,就不会出现该问题。请问一下这个是为什么呢?