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. PRG-TOOLBOX-FB is designed to take advantage of its high transfer bandwidth to update or write to external flash memory for STM32MP devices (like eMMC, SDMMC…) using the standalone tool named "fastboot".
The project is a wrapper of fastboot tool, specifically designed for STM32MP products.
All project information and prerequisites are described on the ST Wiki page: PRG-TOOLBOX-FB