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am335x uboot在哪里初始化RGMII2那几组寄存器的

Other Parts Discussed in Thread: AM3354

平台AM3354,用的ti-sdk-am335x-evm-08.00.00.00 SDK,我们板子把RGMII2那组原来做网口的改做普通GPIO连了LED灯,现在问题是板子一启动,LED灯就亮一下就灭了,我现在不想让他开机亮一下,请问uboot在哪里配置这些寄存器的?