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AM437X 上电后串口0无打印信息

Other Parts Discussed in Thread: TPS65218, AM4379

自己做了一块AM4379板子,总体按照AM437x General Purpose EVM 这块板子设计,DDR改为2片512M/16位的DDR3L(供电电压为1.35V),电源管理芯片使用TPS65218;

上电后,vdd_core=1.1V;VDD_DDR=1.5V;VDD_MPU=1.1V;1.8V和3.3V也是正常值;DDR3电源=1.5V,晶振24M测量正常

状态灯也是仿照AM437x General Purpose EVM的接法;其中AM437X_STATUS_LED1和AM437X_STATUS_LED2,上电后常亮,其他灯不亮;

启动方式配置为sysboot[4:0]={11010} 从UART0启动;

串口工具波特率设置为115200,开发板上电后串口无打印信息;

请问下我这种情况怎么去查问题?