SIMPLEBUS(4)

📦 version 15.1, in freebsd 14.5, freebsd 15.1, nixpkgs unstable

🌸 NAME 🌸

welcome to the Kernel Interfaces Manual, bestie 💖 you're reading SIMPLEBUS(4), and this page is all about simplebus — the ePAPR simple-bus driver 💅✨

⚡ SYNOPSIS ⚡

okay so to get this vibe you need:

options FDT

💖 DESCRIPTION 💖

This bus driver is dedicated to the simple-bus node of a flattened device tree that's compliant with the ePAPR specification 🦋 periodt.

The simplebus entity does not represent any physical element by itself — no cap, it's more of an umbrella node grouping together integrated on-chip peripherals like interrupt controller, connectivity controllers, accelerating engines and so on 🫶💜.

The driver is generic and common for all flattened device tree nodes claiming simple-bus compatibility. It iterates over direct descendants of the simple-bus node, instantiates newbus children, and assigns resources to them based on the configuration data retrieved from the nodes properties in fdt(4) 👑.

note: simplebus does not manage device resources and passes through any requests to the fdtbus(4) layer. so if you thought it was gonna micromanage resources, nope — it's giving pass-through 😌💅

🦋 SEE ALSO 🦋

these three, bestie:

🌈 STANDARDS 🌈

the standard here is the Power.org Standard for Embedded Power Architecture Platform Requirements (ePAPR) 💖 yes the whole name, no skimping.

⭐ HISTORY ⭐

The simplebus support first appeared in FreeBSD 9.0 — a historic moment fr fr 🎀.

🎀 AUTHORS 🎀

The simplebus support was developed by Semihalf under sponsorship from the FreeBSD Foundation 💜. This manual page was written by Rafal Jaworowski 🫶.

source/version: Debian; date: July 12, 2010; page: SIMPLEBUS(4) — mwah, bye bestie! 💋🧚‍♀️

📦 where this page comes from