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使用SD卡启动u-boot的疑问



各位好:

        从SD启动uboot,我将MLO和u-boot.img拷贝到SD里,启动方式设置10111。如果sd卡不插进去,会打印cccc,说明是从uart0启动,放上sd卡之后,不打印ccc了,感觉是从sd启动了。可是观察uart口,又看不到uboot的启动信息。(之前成功通过sd进行ddr3仿真,sd的读取应该没有问题)

         请问uboot启动的时候,会打印启动信息吗,还是需要下发一个字符?打印信息的串口是在哪里配置的呢