mainbus(4)

mainbus4

Device tree root

Usage

mainbus0 at root

Overview

mainbus provides an abstraction for all system buses to attach to. It is the start of the device tree and always attached. It is not a physical device as such, but an abstraction to which other devices may attach.

The actual buses which attach are largely machine-dependent; refer to the individual man pages for more information.

Releases

41 releases since OpenBSD 4.1; the text changed 1 time.

  1. 4.1
  2. 4.2–8.0

From man 8.0-current-20261101 in OpenBSD 8.0-current (2026-11-01). Parsed by carta from the page's mdoc source.