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我看资料说接J5的23脚可以设置成SPI和SD卡启动，但是接完后用串口线连接电脑在终端无输出，sd卡已经做成启动卡了。
请参考下面这两篇文档：
http://processors.wiki.ti.com/index.php/SYSBIOS_Industrial_SDK_Getting_Started_Guide
http://processors.wiki.ti.com/index.php/AM335x_Industrial_Communication_Engine_EVM_Rev2_1_HW_User_Guide
