This repository contains a proposed "ARM boot stub" for the Raspberry Pi 3 running in AArch64 mode. It is anticipated the boot stub will be integrated into the VC FW. A very simple test application is included to demonstrate its use.

The ARM boot stub was inspired by the AArch32 boot stub code that the Raspberry Pi Foundation published at my request in raspberrypi/firmware#579 The license/copyright match their code release.

Some of the application code is stolen from U-Boot, including some from my not-yet-upstream AArch32 port of U-Boot to the Raspberry Pi:

• git://git.denx.de/u-boot.git
• git://github.com/swarren/u-boot.git

To build, simply run ./build.sh. This was tested on Ubuntu 14.04/16.04. You will need an aarch64-linux-gnu-gcc binary (i.e. gcc-aarch64-linux-gnu package) or equivalent.

To make a bootable SD card, start with a recent Raspbian image, update all the firmware files to the latest from firmware.git, then:

• Copy config.txt to the boot partition.
• Delete kernel.img from the boot partition.
• Copy test.bin to the boot partition as kernel7.img.

You'll need a serial console running at 115200 baud to observe the code running.