Baremetalで遊ぶ Raspberry Pi 5 RP1 UART編 - /home/tnishinaga/TechMEMO
Raspberry Pi 5のほとんどのIOはPCIeで接続されたRP1というチップを経由して行われるので、私はbaremetalではPCIeコントローラーのドライバを書かないとRP1経由でIO制御ができないと思っていました。 そのため先日なんとかPCIeコントローラーのドライバを書き上げたのですが、実はfirmwareがPCIeコントローラーを初期化したあとリセットせずにkernelを立ち上げてくれる機能がfirmwareにあることを後で知りました。 By default, the PCIe X4 interface is reset before loading the kernel so that the PCIe RC is in a clean state. For bare metal / bringup you can add pciex4_reset=0 to config
PASAN: Detecting Peripheral Access Concurrency Bugs within Bare-Metal Embedded Applications | USENIX
GitHub - babbleberry/rpi4-osdev: Tutorial: Writing a "bare metal" operating system for Raspberry Pi 4
When we buy a computer or a tablet/smartphone it typically comes with some basic software pre-installed. You'll likely be familiar with watching Microsoft Windows, Mac OS, iOS, Android or maybe even Linux start up as you power the device (or boot it) for the first time. These are all operating systems - software designed to make computer chips work out of the box for mere mortals like you and me.
GitHub - rsta2/circle: A C++ bare metal environment for Raspberry Pi with USB (32 and 64 bit)
Circle is a C++ bare metal programming environment for the Raspberry Pi. It should be usable on all existing models (tested on model A+, B, B+, on Raspberry Pi 2, 3, 4, 400, 5 and on Raspberry Pi Zero), except on the Raspberry Pi Pico, which is not supported. Circle provides several ready-tested C++ classes and add-on libraries, which can be used to control different hardware features of the Raspb
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GitHub - ytakano/blisp: A statically typed Lisp like scripting programming language for Rust.
GitHub - zetzit/zz: 🍺🐙 ZetZ a zymbolic verifier and tranzpiler to bare metal C
