80 lines
2.7 KiB
Groff
80 lines
2.7 KiB
Groff
.\" $NetBSD: genfb.4,v 1.3 2009/08/24 02:25:18 jmcneill Exp $
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.\"
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.\" Copyright (c) 2007 Michael Lorenz
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. The name of the author may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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.\" BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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.\" AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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.\" OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd August 23, 2009
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.Dt GENFB 4
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.Os
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.Sh NAME
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.Nm genfb
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.Nd generic framebuffer console driver
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.Sh SYNOPSIS
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.Cd "genfb* at pci?"
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.Cd "genfb* at sbus?"
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.Cd "wsdisplay* at genfb?"
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.Sh DESCRIPTION
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The
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.Nm
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driver provides support for generic framebuffers that have no native driver.
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All it needs are some parameters to describe the framebuffer and an address.
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.Ss PCI
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When attaching to a
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.Xr pci 4
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bus the driver is configured via device properties:
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.Bl -tag -width Dv
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.It Dv width Pq Li uint32
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Width in pixels.
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.It Dv height Pq Li uint32
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Height in pixels.
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.It Dv stride Pq Li uint32
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Line size in bytes.
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.It Dv depth Pq Li uint32
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Bits per pixel.
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.It Dv is_console Pq Li bool
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If true,
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.Nm
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will try to become the system console.
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.It Dv address Pq Li uint32
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Bus address of the framebuffer.
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.El
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.Ss SBus
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When attaching to
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.Xr sbus 4
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all those parameters are retrieved from the firmware.
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.Sh SEE ALSO
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.Xr pci 4 ,
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.Xr sbus 4 ,
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.Xr wscons 4 ,
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.Xr wsdisplay 4
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.Sh BUGS
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There is no way to change the color map even when the firmware supports it.
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The
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.Xr pci 4
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bus frontend has only been tested on macppc, i386, and amd64 and requires
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machine dependent code to pass the properties mentioned above.
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So far only macppc, i386, and amd64 provides them.
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