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AM5718 u-boot 调试串口无打印信息

用的官方u-boot-2017.01+gitAUTOINC+9fd60700db-g9fd60700db 编译后SD卡启动,上电无论怎么配一些参数,调试串口一直没信息输出,调试串口用的是UART3,板子使我们自己的版,无board ID芯片。 编的LED程序是可以正常点亮和熄灭,请问如果自己配置UART3,需要配置哪些寄存器及其值是多少?然后串口可以正常工作