How to configure U-Boot to support Fastboot mode

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Applicable for

STM32MP13x lines, STM32MP15x lines

1. Article purpose[edit source]

This article explains how to configure fastboot mode in U-Boot.

2. Fastboot[edit source]

Fastboot is a protocol that was originally created for Android and is primarily used to modify the flash filesystem via a USB connection from a host computer.

3. Fastboot in U-Boot[edit source]

Fastboot is supported in U-Boot. It's not necessarily enabled by default.
A U-Boot binary, and so a fip, can support only one mass storage device for fastboot. For instance, if a U-Boot is configured to support fastboot on eMMC it cannot be used to program the SD-Card with fastboot.

To enable fastboot or modify fastboot configuration, U-Boot configuration must be modified. This can be done with the SDK.

3.1. With fragments[edit source]

To support fastboot on SD-Card on STM32MP157F-EV1 , following steps have to be followed.

Warning

The prerequisites from the Cross-compile with OpenSTLinux SDK article must be executed.

First of all, mmc device must be identified

SD-Card is on mmc0

Append the corresponding fragment to the default configuration

cat ../fragment-04-fastboot_mmc0.fb_cfg >> configs/stm32mp15_defconfig

Build U-Boot as usual with the SDK

make -f $PWD/../Makefile.sdk UBOOT_DEFCONFIG=stm32mp15_defconfig DEVICETREE=stm32mp157f-ev1 all

3.2. With menuconfig[edit source]

and make menuconfig