---
name: "octciu"
section: "4"
platform: "openbsd"
package: "man"
version: "8.0-current-20261101"
release: "OpenBSD 8.0-current (2026-11-01)"
platforms: ["openbsd"]
url: "https://new.carta.tech/octciu"
---

# octciu(4)

OCTEON central interrupt unit

## NAME

**octciu** – OCTEON central interrupt unit

## SYNOPSIS

**octciu\* at fdt?**

## DESCRIPTION

The **octciu** driver provides support for the OCTEON central interrupt unit (CIU). The CIU is present at least on the following system on chips:

-

  CN3xxx

-

  CN5xxx

-

  CN60xx

-

  CN61xx

-

  CN70xx

-

  CN71xx

## SEE ALSO

[octcib(4)](/octcib/4.md), [octcit(4)](/octcit/4.md)

## HISTORY

Control code for the CIU first appeared in OpenBSD 5.4.