RE: How to set conf and overlay files for the network core bootloader

Vidar Berg — Mon, 08 Apr 2024 13:23:40 GMT

Hi Aaron,

The child_image folder structure does not support overlays for a child image nested within another child image. As a workaround, you can specify the overlay file or Kconfig fragments directly in your project CMakeLists.txt file.

e.g.,

In CMakeLists.txt

cmake_minimum_required(VERSION 3.20.0)

# specify Kconfig file for B0n - must be set before 'find_package'
set(hci_rpmsg_b0n_CONF_FILE "${CMAKE_CURRENT_SOURCE_DIR}/b0n.conf")

find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})

b0n placed in project source directory (of parent image)

#
# Copyright (c) 2020 Nordic Semiconductor ASA
#
# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
#
CONFIG_NCS_SAMPLES_DEFAULTS=y

CONFIG_IS_SECURE_BOOTLOADER=y
CONFIG_MULTITHREADING=n
CONFIG_GPIO=n
CONFIG_ARM_MPU=n
CONFIG_TICKLESS_KERNEL=n
CONFIG_ERRNO=n
CONFIG_SYS_CLOCK_EXISTS=y
CONFIG_FPROTECT=y
CONFIG_FW_INFO=y
CONFIG_SECURE_BOOT_CRYPTO=y
CONFIG_SECURE_BOOT_VALIDATION=y
CONFIG_SECURE_BOOT_STORAGE=y
CONFIG_PCD_NET=y
CONFIG_FLASH=y
CONFIG_FLASH_PAGE_LAYOUT=y
CONFIG_SERIAL=n

# To build with a minimal configuration, use the overlay file
# '-DOVERLAY_CONFIG=overlay-minimal-size.conf'

Best regards,

Vidar