Hardware requirements

• Mini/micro USB cable

• Personal Computer

Board settings

Make sure the board is setup to boot from flash.

MCUBoot memory layout

In all cases, the MCUBOOT bootloader reserves 128kB at the beginning of the external flash followed by 4.4MB slots for application. The resulting layout for the monolithic application will be as follows:

Region	From	To	Size
MCUboot code	0x08000000	0x0801FFFF	128kB
Primary slot	0x08020000	0x0845FFFF	4352kB
Secondary slot	0x08460000	0x0889FFFF	4352kB

• MCUBoot is configured to use its DIRECT_XIP image handling strategy together with FlexSPI flash remapping

• For testing purposes, the image authentication may be disabled in sblconfig.h by uncommenting the CONFIG_BOOT_OTA_TEST definition so that the following is defined:

  #define MCUBOOT_NO_SIGN #define CONFIG_BOOT_HASH_NO_SIGN #define CONFIG_BOOT_DIGEST_TYPE_SHA256

Image signing example

imgtool sign   --key sign-rsa2048-priv.pem
               --align 4
               --version 1.1
               --slot-size 0x440000
               --header-size 0x400
               --pad-header
               ota_mcuboot_basic.bin
               ota_mcuboot_basic.SIGNED.bin

Note that for the first image flashed manually together with the bootloader additional imgtool options --pad and --confirm must be used. Otherwise the bootloader would reject the image for missing data in the trailer area.