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Makefile		Makefile
Package.swift		Package.swift
README.md		README.md
link.ld		link.ld

README.md

rpi4b-blink

Requirements

A Raspberry Pi 4B board
An SD Card, with a Raspberry Pi OS installed (this way, we don't need to create the configuration files from scratch). You may backup kernel8.img and config.txt if you need the Linux install later, since we will change these files.
LLVM installed (brew install llvm) and added to PATH. This is needed to convert the resulted ELF file to binary image format using llvm-objcopy.

How to build and run this example:

Make sure you have a recent nightly Swift toolchain that has Embedded Swift support.
Build the program, then copy the kernel image to the SD card.

$ cd rpi4b-blink
$ export TOOLCHAINS='<toolchain-identifier>' # Your Swift nightly toolchain identifier
$ make
$ cp kernel8.img /Volumes/bootfs

If your original OS is not 64-bit, make sure to set arm_64bit=1 in config.txt.
Place the SD card in your Raspberry Pi 4B, and connect it to power.
After the boot sequence, the green (ACT) led will start blinking in a regular pattern.