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* reads the mode pins to determine the primary boot device

* once it is satisfied, it executes the boot code

Two options are available related to system boot. They are identified by the Boot field of the ordering code as follows:

In any case, boot process is managed by on-chip boot ROM code that is described in detail in processor's Reference Manual.

Selection of primary boot device is determined by the BOOT_MODE_SEL signal as follows:

* BOOT_MODE_SEL = 0

** in case no valid image is found on eMMC, boot ROM shall enable USB serial download mode automatically

Selection of primary boot device is determined by the BOOT_MODE_SEL signal as follows:

* BOOT_MODE_SEL = 0

** in case no valid image is found in NAND flash, boot ROM shall enable USB serial download mode automatically

When the internal boot and recover boot (if enabled) failed, the boot goes to the ''SD/MMC manufacture mode'' before the serial download mode.