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once the watchdog function of the TPS65381 is activated you cannot stop it anymore as this is a safety feature.
Before you activate the watchdog, you could add a function in in your software, which recognizes (i.e. by checking a I/O pin),.if you want to execute application code or if you want to program the TMS570. Depending on what you want to do, the watchdog gets initialized or not.
However, in order to reprogram your TMS570 you can do the following: Power up your hardware with TMS570 held in reset so that program execution cannot start and TPS65381 does not get initialized. After 600ms the TPS65381 enters SAFE state and you can release the reset from TMS570 and reprogram the device.
Following some more ideas how to get the TMS570 reprogrammed, but they require hardware modification:
1. Prevent the TPS65381 to be initialized by i.e. open up a SPI connection
2. Prevent TMS570 to get reset by TPS65381 by opening the reset connection from TPS65381 to TMS570. Make sure the reset line on TMS570 side is pulled high.
