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AWR1243: Download firmware over SPI

Part Number: AWR1243

Hello, 

We made a customized board with two cascaded AWR1243P chips. The external MCU is connected to 

AWR1243 through SPI interface.

Now we are trying to download the bss firmware to AWR1243 ( we do not have SPI flash on board ) 

through SPI with SOP mode 2. However, we always encounter "mmwave device power on failed with error -8", which seems that 

AWR1243 did not response after the reset pin is released. 

I wonder if we set the correct SOP mode or we miss something.

Best~