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.Dd February 17, 2017
.Dt INTRO 4 prep
.Os
.Sh NAME
.Nm intro
.Nd introduction to prep special files and hardware support
.Sh DESCRIPTION
This section describes the special files, related driver functions,
and networking support available in the system.
In this part of the manual, the
.Tn SYNOPSIS
section of each configurable device gives a sample specification
for use in constructing a system description for the
.Xr config 1
program.
The
.Tn DIAGNOSTICS
section lists messages which may appear on the console
and/or in the system error log
.Pa /var/log/messages
due to errors in device operation;
see
.Xr syslogd 8
for more information.
.Pp
This section contains both devices
which may be configured into the system
and network related information.
The networking support is introduced in
.Xr netintro 4 .
.Sh PMPPC DEVICE SUPPORT
This section describes the hardware supported on the
.Tn PowerPC Reference Platform
machines.
Software support for these devices comes in two forms.
A hardware device may be supported with a character or block
.Em device driver ,
or it may be used within the networking subsystem and have a
.Em network interface driver .
Block and character devices are accessed through files in the file
system of a special type; see
.Xr mknod 8 .
Network interfaces are indirectly accessed through the interprocess
communication facilities provided by the system; see
.Xr socket 2 .
.Pp
A hardware device is identified to the system at configuration time
and the appropriate device or network interface driver is then compiled
into the system.
When the resultant system is booted, the
autoconfiguration facilities in the system probe for the device
and, if found, enable the software support for it.
If a device does not respond at autoconfiguration
time it is not accessible at any time afterwards.
To enable a device which did not autoconfigure,
the system will have to be rebooted.
.Pp
The autoconfiguration system is described in
.Xr autoconf 4 .
A list of the supported devices is given below.
.Sh SEE ALSO
.Xr config 1 ,
.Xr autoconf 4 ,
.Xr pnpbus 4 ,
.Xr prep/nvram 4
.Sh HISTORY
The
.Tn prep
.Nm intro
man page first appeared in
.Nx 4.0 .
.Sh LIST OF DEVICES
The devices listed below are supported in this incarnation of
the system.
Devices are indicated by their functional interface.
Not all supported devices are listed.
.Pp
The pnpbus is a pseudo-bus which is a configuration interface for certain
devices on PReP machines.
These devices are defined in the PReP
residual data with configuration information, similar to
.Xr isapnp 4 .
The underlying bus is generally ISA.
.Pp
ISA devices are supported through the
.Xr isa 4
bus and associated devices.
.Pp
PCI devices are supported through the
.Xr pci 4
bus and associated devices.
.Pp
USB devices are supported through the
.Xr usb 4
bus and associated devices.
.Pp
Additionally, the following specific devices are supported:
.Bl -tag -width "xxxxxxxx" -compact -offset indent
.It Em com
serial ports
.It Em nvram
NVRAM chip
.It Em wdc
ISA IDE controller
.It Em we
Western Digital/SMC WD80x3 ethernet driver
.It Em mcclock
mc146818 compatible time-of-day clock
.It Em mkclock
Mostek MK48T18 time-of-day chip
.El