.\" $NetBSD: em4k.4,v 1.6 2017/02/17 22:24:45 christos Exp $
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.\" Copyright (c) 2013 The NetBSD Foundation, Inc.
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.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Radoslaw Kujawa.
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.Dd February 17, 2017
.Dt EM4K 4 amiga
.Os
.Sh NAME
.Nm em4k
.Nd ELBOX Mediator 4000 PCI bridge driver
.Sh SYNOPSIS
.Cd "em4k0 at zbus0"
.Cd "emmem0 at zbus0"
.Cd "pci* at empb0"
.Cd "options PCI_NETBSD_CONFIGURE"
.Sh DESCRIPTION
The
.Nm
driver provides support for the PCI bus present on Mediator 4000 bridge and associated
PCI/Zorro daughterboards.
.Sh HARDWARE
The
.Nm
driver supports the following hardware:
.Bl -tag -offset indent
.It ELBOX Mediator PCI 4000D
.It ELBOX Mediator PCI 4000Di
.It ELBOX Mediator PCI 4000T
.It ELBOX Mediator PCI 3000D
.It ELBOX Mediator PCI 3000T
.El
MK-II editions are also supported.
.Sh SEE ALSO
.Xr amiga/empb 4 ,
.Xr amiga/mppb 4 ,
.Xr amiga/p5pb 4 ,
.Xr pci 4
.Sh HISTORY
The
.Nm
device first appeared in
.Nx 7.0 .
.Sh AUTHORS
.An -nosplit
The
.Nm
driver was written by
.An Radoslaw Kujawa Aq Mt radoslaw.kujawa@gmail.com .
It was developed using information obtained through reverse engineering
by
.An Frank Wille
and
.An Radoslaw Kujawa .
The authors have no access to official
documentation (which is only available under NDA).
.Sh BUGS
DMA to host memory is not supported.
It is unclear if the hardware supports DMA to host memory at all.
It is possible to implement DMA through bounce buffers in graphics card memory,
but this needs further research.