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sbl uart flash是用来烧写OSPI,板子没有接OSPI的话,就不能烧写。
SD boot流程,可以参考下面的user guide.
https://software-dl.ti.com/mcu-plus-sdk/esd/AM243X/latest/exports/docs/api_guide_am243x/BOOTFLOW_GUIDE.html#BOOTFLOW_SBL_SD