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应该来说，解密的时候将boot模式切换到wait模式是必须的，F28035的TRM中有讲到：
This device does not support the hardware wait-in-reset mode that is available on other
C2000 parts. The "wait" boot mode can be used to emulate a wait-in-reset mode. The "wait"
mode is very important for debugging devices with the CSM password programmed (that is,
secured). When the device is powered up, the CPU will start running and may execute an
instruction that performs an access to an emulation code security logic (ECSL) protected
area. If this happens, the ECSL will trip and cause the emulator connection to be cut. The
"wait" mode keeps this from happening by looping within the boot ROM until an emulator is
connected.
我认为可以，具体的你可以参考一下引脚说明：
JTAG test reset with internal pulldown. TRST, when driven high, gives the scan
system control of the operations of the device. If this signal is not connected or
driven low, the device operates in its functional mode, and the test reset signals
are ignored. NOTE: TRST is an active high test pin and must be maintained low
at all times during normal device operation. An external pulldown resistor is
required on this pin. The value of this resistor should be based on drive strength
of the debugger pods applicable to the design. A 2.2-kΩ resistor generally offers
adequate protection. Because this is application-specific, TI recommends
validating each target board for proper operation of the debugger and the
application. (↓)
