BootROM BCT

The BootROM BCT includes the following data types to select the primary boot chain:


Data Type	Description
u32_non_gpio_select_boot_chain_field	Indicates the primary boot chain when the GPIO selection is NOT enabled. 0 = Boot Chain A 1 = Boot Chain B 2 = Boot Chain C Valid values are 0 to (u32_num_boot_chains – 1)
bf_bl_gpio_select_boot_chain_1b	Toggles to enable or disable the GPIO selection of the boot chain. 0 = disable GPIO selection and use the boot chain selected by u32_non_gpio_select_boot_chain_field. 1= enable GPIO selection and use the boot chain selected by GPIO inputs. SOC_GPIO31 controls lower bit for selection. SOC_GPIO41 controls upper bit for selection. Only used when u32_num_boot_chains > 2.
u32_num_boot_chains	Indicates the number of boot chains in the system. Valid values are 1 – 3.

For guidance on connecting a GPIO to enable selection of the boot chain, refer to the Orin Interface Design Guide (DG-08535-001).