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OMAP_L138安全启动问题?



我的板子上面用的芯片型号是OMAP-L138B  ZWT  E,现在JTAG口一直连接不上,数据手册上说明, 安全启动的芯片在默认情况下, JTAG 端口被
锁死以防止仿真和调试攻击,但是在应用开发的安全启动过程中,此端口可以被激活,请问新买回来的芯片,如何安全启动,JTAG口如何被激活?