.\"	$NetBSD: bochsfb.4,v 1.1 2026/01/31 12:12:58 nia Exp $
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.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Jiaxun Yang.
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.Dd March 2, 2025
.Dt BOCHSFB 4
.Os
.Sh NAME
.Nm bochsfb
.Nd Bochs Display Interface framebuffer
.Sh SYNOPSIS
.Cd "bochsfb* at pci?"
.Cd "wsdisplay* at bochsfb?"
.Ss Options
.Cd "options	BOCHSFB_DEFAULT_WIDTH=integer"
.Cd "options	BOCHSFB_DEFAULT_HEIGHT=integer"
.Sh DESCRIPTION
The
.Nm
driver provides support for graphics devices implementing the Bochs VBE
DISPI interface, including the Bochs reference VGA implementation, and the
QEMU StdVGA device.
It programs the linear framebuffer through the DISPI registers and makes it
available through
.Xr wsdisplay 4
as a console or
.Xr wsfb 4
compatible framebuffer.
.Pp
When a memory-mapped DISPI bar with an EDID block is present,
.Nm
uses the preferred mode reported by the display.
Devices without EDID support (such as virtio-vga) fall back to a 1024x768
32-bit mode.
If no MMIO bar is available, the driver accesses the DISPI registers via the
legacy VGA I/O ports.
.Sh SEE ALSO
.Xr intro 4 ,
.Xr pci 4 ,
.Xr vga 4 ,
.Xr wscons 4 ,
.Xr wsdisplay 4
.Sh HISTORY
The
.Nm
driver first appeared in
.Nx 12.0 .
.Sh AUTHORS
.An -nosplit
The
.Nm
driver was written by
.An Jiaxun Yang Aq Mt jiaxun.yang@flygoat.com .