1.\" $OpenBSD: gcu.4,v 1.5 2013/07/16 16:05:48 schwarze Exp $ 2.\" 3.\" Copyright (c) 2009 Dariusz Swiderski <sfires@sfires.net> 4.\" 5.\" Permission to use, copy, modify, and distribute this software for any 6.\" purpose with or without fee is hereby granted, provided that the above 7.\" copyright notice and this permission notice appear in all copies. 8.\" 9.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16.\" 17.Dd $Mdocdate: July 16 2013 $ 18.Dt GCU 4 19.Os 20.Sh NAME 21.Nm gcu 22.Nd Intel EP80579 Global Configuration Unit 23.Sh SYNOPSIS 24.Cd "gcu* at pci?" 25.Sh DESCRIPTION 26The 27.Nm 28driver provides access to the miibus that is hidden behind the GCU device. 29It is used to control PHYs on embedded designs utilizing Intel's EP80579 30chips. 31.Pp 32The GCU also provides access to CAN, SSP and TDM signal strength drivers, 33but since they are not supported by 34.Ox 35the driver does not provide any 36functionality related to them. 37.Sh SEE ALSO 38.Xr em 4 , 39.Xr intro 4 , 40.Xr netintro 4 , 41.Xr pci 4 42.Pp 43Intel's EP80579 Datasheet: 44.Lk http://download.intel.com/design/intarch/ep80579/320066.pdf 45.Sh HISTORY 46The 47.Nm 48driver first appeared in 49.Ox 4.7 . 50.Sh AUTHORS 51The 52.Nm 53driver was written by 54.An Dariusz Swiderski Aq Mt dms@openbsd.org , 55partially based on the 56.Fx 57driver released by Intel under the ISC license. 58