.\" Copyright (c) 2003 Matthew N. Dodd <winter@jurai.net>
.\" All rights reserved.
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.\" $FreeBSD$
.\"
.Dd April 4, 2003
.Dt VPD 4 i386
.Os
.Sh NAME
.Nm vpd
.Nd "Vital Product Data kernel interface"
.Sh SYNOPSIS
.Cd "device vpd"
.Sh DESCRIPTION
.Tn IBM ThinkPad
notebooks (and most
.Tn IBM
desktop PCs) have a 48-byte
Vital Product Data (VPD) structure located in the BIOS Shadow RAM.
.Pp
The VPD provides machine type and model information, the build ID
(this is roughly the BIOS version) and serial number information.
.Pp
The
.Nm
driver scans the BIOS area and claims the memory used by the VPD
structure.
It provides the
.Xr sysctl 3
branch
.Va hw.vpd
to allow this information to be accessed by the userland.
The following variables are provided, one per VPD attachment (there should
only be one):
.Pp
.Bl -tag -width ".Dv MACHINE_MODEL" -compact
.It Dv MACHINE_TYPE
.Pq Va machine.type
Machine type.
.It Dv MACHINE_MODEL
.Pq Va machine.model
Machine model.
.It Dv BUILD_ID
.Pq Va build.id
BIOS Build ID.
.It Dv SERIAL_BOX
.Pq Va serial.box
Box Serial Number.
.It Dv SERIAL_PLANAR
.Pq Va serial.planar
Motherboard Serial Number.
.El
.Sh SEE ALSO
.Rs
.%T "TP General - Using the BIOS Build ID to identify IBM ThinkPad systems"
.%N "Reference #: MIGR-45120"
.%D "November 22, 2002"
.%O "http://www.ibm.com/support/docview.wss?uid=psg1MIGR-45120"
.Re
.Sh HISTORY
The
.Nm
driver first appeared in
.Fx 5.1 .
.Sh AUTHORS
The
.Nm
driver and this manual page were written by
.An Matthew N. Dodd Aq mdodd@FreeBSD.org .
.Sh BUGS
The checksum code is not quite correct so we are not able to detect
a corrupt VPD structure.