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+.\" $OpenBSD: octciu.4,v 1.2 2017/08/06 05:49:12 visa Exp $
+.\"
+.\" Copyright (c) 2017 Visa Hankala
+.\"
+.\" Permission to use, copy, modify, and distribute this software for any
+.\" purpose with or without fee is hereby granted, provided that the above
+.\" copyright notice and this permission notice appear in all copies.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+.\"
+.Dd $Mdocdate: August 6 2017 $
+.Dt OCTCIU 4 octeon
+.Os
+.Sh NAME
+.Nm octciu
+.Nd OCTEON central interrupt unit
+.Sh SYNOPSIS
+.Cd "octciu* at fdt?"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for the OCTEON central interrupt unit (CIU).
+The CIU is present at least on the following system on chips:
+.Pp
+.Bl -item -offset indent -compact
+.It
+CN3xxx
+.It
+CN5xxx
+.It
+CN60xx
+.It
+CN61xx
+.It
+CN70xx
+.It
+CN71xx
+.El
+.Sh SEE ALSO
+.Xr octcib 4 ,
+.Xr octcit 4
+.Sh HISTORY
+Control code for the CIU first appeared in
+.Ox 5.4 .