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am57xx-evm-linux-04.01.00.06这个系统写到SD卡，启动后，默认是哪个串口输出启动信息？是从UART3输出启动信息吗？不差SD卡，无任何程序，上电，AM5718调试串口UART3会打印CCCC....吗？
1. 是从uart3打印的，这是ROM bootloader规定好的。
2. 只要设置好uart boot mode，不需要插卡就可以打印。
