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Two options are available related to system boot. They are identified by the Boot field of the ordering code as follows:
* 0: SPI NOR / SD option (SOM code: DAUxxx0xxxxR)
* 1: eMMC / SD option (SOM code: DAUxxx1xxxxRDAUxxx2xxxxR)* 2: SPI NAND / SD option (SOM code: DAUxxx2xxxxRDAUxxx1xxxxR)
For both options the selection of primary boot device is determined by the BOOT_MODE_SEL signal as described in the following sections. BOOT_MODE_SEL is latched when processor reset is released.