Bureaucrats, dave_user, Administrators
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<section begin="History" />
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== System boot ==
* once it is satisfied, it executes the boot code
=== Boot options ===
Two options are available related to system boot. They are identified by the ''Boot field '' of the ordering code as follows:* Boot field = 0 (SOM code: DXLxxxx'''0'''xxR): "SPI NOR / SD " option * Boot field = 1 (SOM code: DXLxxxx0xxRDXLxxxx'''1'''xxR)* 1: "NAND / SD " option (SOM code: DXLxxxx1xxR)For both options , the selection of the primary boot device is determined by the [[AXEL Lite SOM/AXEL Lite Hardware/Power and Reset/Reset scheme and control signals|BOOT_MODE_SEL ]] signal as described in the following sections. BOOT_MODE_SEL is latched when processor reset is released.
In any case, boot process is managed by on-chip boot ROM code that is described in detail in processor's Reference Manual.
==== SPI NOR / SD option ====
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 NOR flash, boot ROM shall enable USB serial download mode automatically
==== NAND / SD option ====
Selection of primary boot device is determined by the BOOT_MODE_SEL signal as follows:
* BOOT_MODE_SEL = 0