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CCS/AM3352: SYSBOOT pin issue

Part Number: AM3352

Tool/software: Code Composer Studio

Hello

I used CCS to debug AM3352 through JTAG, but when initialization,it shows  the Input Clock Read from SYSBOOT[15:14] was prompted 25MHz AM335x PLL Config failed!!Check SYSBOOT[15:14] for proper input freq config, then I found that the value of control_status resister was not correct through the value of Resisters in CCS.I used the dial-code switch to set sysboot mode, and measured the voltage values of sysboot [15-14] were 0 and 3.3v respectively, and the crystal frequency of the system as 24Mhz.The value of SYSBOOT pin cannot be detected correctly.Why I can't  detect the sysboot value successfully?

thanks