.\"     $OpenBSD: fhc.4,v 1.8 2008/01/18 22:06:01 jmc Exp $
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.\" Copyright (c) 2004 Jason L. Wright (jason@thought.net)
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.Dd $Mdocdate: January 18 2008 $
.Dt FHC 4 sparc64
.Os
.Sh NAME
.Nm fhc
.Nd SPARC64 FireHose controller
.Sh SYNOPSIS
.Cd "fhc* at central?"
.Cd "fhc* at mainbus0"
.Sh DESCRIPTION
The
.Nm
device provides support for the
FireHose controllers
found on Sunfire, Starfire, and Wildfire
UltraSPARC systems.
These devices are used for board level
functions on these systems.
This device also controls an LED for each slot.
This LED can be made to blink based on the load average on most systems
by setting the
.Xr sysctl 3
variable
.Ar machdep.led_blink
to a non-zero value.
.Sh HARDWARE
.Ox
includes the following
.Nm
drivers, sorted by driver name:
.Pp
.Bl -tag -width zs/zstty/zskbd(4) -offset ind -compact
.It Xr clkbrd 4
SPARC64 Clock Board
.It Xr clock 4
Real-time clock
.It Xr environ 4
SPARC64 temperature sensor
.It Xr zs/zstty/zskbd 4
Zilog 8530 (ZSCC) serial communications driver
.El
.Sh SEE ALSO
.Xr sysctl 3 ,
.Xr central 4 ,
.Xr intro 4
.Sh HISTORY
.Ox
support for the
.Nm
first appeared in
.Ox 3.7 .