ETRA SOM/ETRA Hardware/Power and Reset/System boot
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System boot[edit | edit source]
The boot process begins at Power On Reset (POR) where the hardware reset logic forces the ARM core to begin execution starting from the on-chip boot ROM. The boot ROM:
- determines whether the boot is secure or non-secure
- performs some initialization of the system and clean-ups
- reads the mode pins to determine the primary boot device
- once it is satisfied, it executes the boot code
Boot options[edit | edit source]
The default primary boot device is internally set by pull-up or pull-down resistors according to the Boot Mode fileld of the ordering code.
The BOOT_MODEx signals are also present on the SoM connector to override the primary boot device.
The following table shows all the available options:
Use 1k resistors either to VDD or DGND to drive the BOOT_MODEx signals.
