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官方开发板，使用SD卡和EMMC启动（拨码开关确认正确），串口无打印，各路电压均正常，晶振只有WKUP_OSC0 有波形，OSC1 和WKUP_LFOSC均无波形，有没有类似现象的？
请问跑的是RTOS还是linux？
是否参考过手册制作SD卡？
https://software-dl.ti.com/jacinto7/esd/processor-sdk-rtos-jacinto7/07_03_00_07/exports/docs/psdk_rtos/docs/user_guide/out_of_box_j721e.html#dev-platform-out-of-the-box-demos
