.\"	$NetBSD: tpm.4,v 1.4.6.2 2022/08/03 16:00:47 martin Exp $
.\"
.\" Copyright (c) 2019 The NetBSD Foundation, Inc.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Maxime Villard.
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.Dd October 6, 2019
.Dt TPM 4
.Os
.Sh NAME
.Nm tpm
.Nd Trusted Platform Module
.Sh SYNOPSIS
.Cd "tpm* at isa? iomem 0xfed40000"
.Cd "tpm* at acpi?"
.Sh DESCRIPTION
The
.Nm
driver provides support for various Trusted Platform Module (TPM) chips.
.Pp
Supported modules:
.Pp
.Bl -bullet -compact -offset indent
.It
TPM 2.0 chips over ACPI
.It
TPM 1.2 chips over ISA
.El
.Pp
Note that the supported interface version is TIS1.2 in each case.
.Pp
The TPM may need to be enabled in the system's firmware or BIOS, which
requires a reboot to take effect.
This is generally beyond the control of
.Nx .
Enabling a TPM does not require using trusted boot \(em it can be
enabled, for example, only for the
.Xr rnd 4
entropy source.
.Sh SEE ALSO
.Xr config 1 ,
.Xr intro 4 ,
.Xr rnd 4
.Sh AUTHORS
.An -nosplit
The
.Nm
driver was written by
.An Maxime Villard ,
.An Michael Shalayeff
and
.An Hans-Joerg Hoexer .