SD card update with customized trusted image

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This article gives details about updating the bootloader objects of SD card, located onto STM32MP157x-EV1 (e.g.), using STM32CubeIDE.

1. Overview[edit source]

First SD card is intialized with Starter Package image thanks to STM32CubeProgrammer.
The trusted image is built inside STM32CubeIDE with Device Tree configured thanks to embedded STM32CubeMX. Next step is to update STM32MP15 target; this meaning your MP15 target is up and running with network access: target status is green.
The way to check this customization is to compare version appearing in boot message.

2. Initial configuration[edit source]

Here are the TF-A BL2, U-boot version and the used extlinux.conf file used in Starter Package.

SD-Card initial setting: TF-A BL2 version

SD-Card initial setting: U-boot version & extlinux.conf

SD-Card initial setting: extlinux.conf content

3. Update[edit source]

First, after compiling Device Tree from STM32CubeMX we need to update MP15 target bootfs with new .dtb under /boot and adjust /boot/mmc0_extlinux/extlinux.conf. This is done thanks to Cortex-A Linux^® Deployment shortcut configuration available from Linux^® project Run As... .

Linux^® deployment configuration

Linux^® deployment message

Linux^® device tree update

Then, select Cortex-A project and right click to get Cortex-A Bootloader Deployment shortcut.

Bootloader update shortcut

Connection is automatically set and you need to scan MP15 target storage. This storage list depends on the board and on boot storage used. Then select the storage to update, SD-Card here; TF-A BL2 & FIP image to update.

Bootloader deployment configuration

Bootloader deployment message

4. Final configuration[edit source]

After the update, TF-A BL2 and U-Boot versions are modified and Linux^® uses the generated Device Tree.

SD-Card updated TF-A BL2

SD-Card updated U-Boot version & Linux^® Device Tree