Hi,
I'm using MCUBoot in my application but this last would hardfault all the time. I figured that the a MCUBoot header was inserted at the beginning of the code partition and that this header is considered as a partition by MCUBoot . Therefore, when the MCUBoot would read the header to validate it, it would use index 2 in the flash_map[] array which would point to an invalid address since only two partitions are defined (at index 0 and 1) in the board description file:
&flash0 {
partitions {
compatible = "fixed-partitions";
#address-cells = <1>;
#size-cells = <1>;
boot_partition: partition@0 {
label = "mcuboot";
reg = <0x0 0xC000>;
};
slot0_partition: partition@C000 {
label = "image-0";
reg = <0xC000 0x74000>;
};
};
};
In function boot_go from single_loader.c file, the flash_area_open function is called (line 448) with argument "FLASH_AREA_IMAGE_PRIMARY(0)" as the index of the partition to look for in flash_map[] array. This macro is replaced at compile time by the value 2.
I found a work around. I create a partition for the header which overlaps the code partition. This creates a new entry in flash_map[] array at index 1 and the application is moved to index 2 therefore the partition exist in the flash_map array and I got rid of the hardfault.
Here is what I did in the board configuration file:
&flash0 {
partitions {
compatible = "fixed-partitions";
#address-cells = <1>;
#size-cells = <1>;
boot_partition: partition@0 {
label = "mcuboot";
reg = <0x0 0xC000>;
};
slot0_header: partition@C000 {
label = "header-0";
reg = <0xC000 0x200>;
};
slot0_partition: partition@C200 {
label = "image-0";
reg = <0xC000 0x74000>;
};
};
};
Here is my MCUboot configuration file:
# # Copyright (c) 2020 Nordic Semiconductor ASA # # SPDX-License-Identifier: LicenseRef-Nordic-5-Clause # CONFIG_BOOT_BANNER=n CONFIG_SIZE_OPTIMIZATIONS=y CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y # Disable memory guard to avoid false faults in application after boot CONFIG_HW_STACK_PROTECTION=n # CONFIG_SYSTEM_CLOCK_NO_WAIT=y # CONFIG_PM=n # CONFIG_BOOT_BOOTSTRAP=n CONFIG_BOOT_ENCRYPT_RSA=n CONFIG_BOOT_SIGNATURE_TYPE_RSA=n CONFIG_BOOT_SIGNATURE_TYPE_ECDSA_P256=y CONFIG_SINGLE_APPLICATION_SLOT=y # Debug CONFIG_THREAD_MONITOR=y CONFIG_DEBUG_THREAD_INFO=y CONFIG_DEBUG_OPTIMIZATIONS=y # Segger RTT CONFIG_CONSOLE=y CONFIG_RTT_CONSOLE=y CONFIG_USE_SEGGER_RTT=y CONFIG_LOG_BACKEND_RTT=y CONFIG_LOG_MODE_IMMEDIATE=y # Logs CONFIG_LOG=y CONFIG_LOG_DEFAULT_LEVEL=4 # CONFIG_LOG_PRINTK=y # Flash # CONFIG_FLASH=y # CONFIG_FLASH_HAS_DRIVER_ENABLED=y # CONFIG_PROTECTED=y # CONFIG_BOOT_ERASE_PROGRESSIVELY=y # CONFIG_SOC_FLASH_NRF_EMULATE_ONE_BYTE_WRITE_ACCESS=y # Serial # CONFIG_SERIAL=y # CONFIG_UART_LINE_CTRL=y # CONFIG_UART_NRFX=n # CONFIG_UART_INTERRUPT_DRIVEN=n # MCUBoot serial # CONFIG_GPIO=y CONFIG_MCUBOOT_SERIAL=y # CONFIG_BOOT_SERIAL_CDC_ACM=n CONFIG_BOOT_SERIAL_UART=y # CONFIG_CONSOLE=y # CONFIG_UART_CONSOLE=y
Is there something I missed which would allow me not to configure this "fake" partition for the boot header?
Regards,
Hugo
