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IWR1843: Is a flash necessary for the iwr1843 to run if the application software is loaded via SPI

Part Number: IWR1843

When reviewing swra627.pdf, I saw a flash device isn't necessary to be present on the QSPI port of the chip if we wanted to load the application software into program memory via SPI from a host processor.  I wanted to check/confirm that the QSPI flash device isn't necessary for operation in this use case.  For example, is the QSPI flash used for caching data?

Thanks you for the help!