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AM4376: 系统移植后,uboot无打印信息

Part Number: AM4376
Other Parts Discussed in Thread: TPS65218

因为老sdk不支持ubuntu 18,想从sdk  04.02.00.09迁移到最新的sdk   07.03.00.005上,但修改uboot后,SD卡启动串口无打印信息,

器件am4376,参考gp_evm开发板,自制单板,无EEPROM,DDR3供电1.5V,1G内存

修改点:

board_detect.c中EEPROM信息写死和gp_evm一样

board.c   改动DDR参数、指定TPS65218的DDR3电压为1.5V

mux.c修改管脚配置

设备树am437x-gp-evm.dts修改为一样

仔细检查了uboot代码,该改的都改了,但串口一直无打印信息,目前无思路,请问下一步思路是啥?谢谢