Introduction

This project is a basic example of M7 bootloader. IVT is set to make this M7 bootloader as boot target. Then M7 bootloader enables A53 lockstep and start the A53 core0.

How to build

Building sources

make CROSS_COMPILE=<armv7-cross-compiler-> compile

How to Build example:

From the project's root folder, and having cross-compile binaries on path:

ARM Trusted Firmware

make CROSS_COMPILE=arm-none-eabi- A53_BOOTLOADER=fip.s32

Above commands will generate fip.s32.m7 file which has to be placed on SDCard instead of usual fip.s32.

Note Don't forget to leave some space for this bootloader when compiling A-TF. This is usually done using FIP_OFFSET_DELTA=0x2000 compilation parameter.

Other build options

By default, M7 boots with A53 lockstep enabled. To disable A53 lockstep, the flag DISABLE_A53_LOCKSTEP should be added to make command.

make DISABLE_A53_LOCKSTEP=1