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IWR1642: download a new software image over UART

Part Number: IWR1642

According to the manual "Secondary Boot Loader (SBL) Software Design",it seems that second boot loader switches the operation either "start the application in the QSPI flash" or
"download a software image from UART" by the command from UART.

My understanding is that it does not refer the SOP mode
and can be controled by the command from UART.

Is my understanding correct? Please give me some advice.