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芯片在Boot Mode SCI模式下可通过SCI端口进行启动引导。并且也提及具体端口是SCI-A，但是在芯片上有多个GIPO可以被定义为SCIA，比如 GPIO0 SCIA-RX ,GPIO1 SCIA-TX; GPIO2 SCIA-TX ,GPIO3 SCIA-RX,等等。
但是规格书中并未提及，芯片在Boot Mode SCI模式下，到底定义的哪个GPIO端口做为自己的SCIA?
default：GPIO29、GPIO28
楼上的回复是正确的，有默认的引脚。
https://www.ti.com.cn/cn/lit/ug/spruix1a/spruix1a.pdf P383 4.7.8 GPIO Assignments
