author yamt <>
Tue, 17 Apr 2012 00:01:34 +0000
changeset 280360 e98874280705
permissions -rw-r--r--
sync with head

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.\" ========================================================================
.IX Title "tpm_nvread 8"
.TH tpm_nvread 8 "2011-07-11" "TPM Management" ""
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
\&\fBtpm_nvread [\s-1OPTIONS\s0]\fR
\&\fBtpm_nvread\fR reads data from an \s-1NVRAM\s0 area and either displays them or writes
them into a file. The user must provide the index of the \s-1NVRAM\s0 area. If the
user provided the number of bytes to read then this will be the maximum
number of bytes that will be read from the \s-1NVRAM\s0 area, otherwise the whole
\&\s-1NVRAM\s0 area will be read. Some \s-1NVRAM\s0 areas only allow read sizes of zero,
i.e., \s-1NVRAM\s0 area with index 0. Optionally an offset into the \s-1NVRAM\s0
area can be given where the reading of the data is to start. If the \s-1NVRAM\s0
area has permission bits set that require owner or \s-1NVRAM\s0 area authentication,
then the password must be provided via the password option.
The following options are supported:
.IP "\fB\-h, \-\-help\fR" 4
.IX Item "-h, --help"
Display command usage info.
.IP "\fB\-v, \-\-version\fR" 4
.IX Item "-v, --version"
Display command version info.
.IP "\fB\-l, \-\-log [none|error|info|debug]\fR" 4
.IX Item "-l, --log [none|error|info|debug]"
Set logging level.
.IP "\fB\-u, \-\-unicode\fR" 4
.IX Item "-u, --unicode"
Use \s-1TSS\s0 \s-1UNICODE\s0 encoding for passwords to comply with applications
using \s-1TSS\s0 popup boxes
.IP "\fB\-z, \-\-well\-known\fR" 4
.IX Item "-z, --well-known"
Use a secret of all zeros (20 bytes of zeros) as either the \s-1NVRAM\s0 area or owner secret.
.IP "\fB\-p, \-\-password\fR" 4
.IX Item "-p, --password"
Depending on what type of authentication is required for the \s-1NVRAM\s0 area, this must either
be the \s-1NVRAM\s0 area or owner password.
A password may be directly provided for example by using '\-\-password=password' or
\&'\-ppassword'. If no password is provided then the program will prompt the user for the
.IP "\fB\-i, \-\-index\fR" 4
.IX Item "-i, --index"
The index of the \s-1NVRAM\s0 area.
The parameter may either be a decimal number or a hexadecimal number starting with '0x'.
.IP "\fB\-s, \-\-size\fR" 4
.IX Item "-s, --size"
The number of bytes to read from the \s-1NVRAM\s0 area.
The parameter may either be a decimal number or a hexadecimal number starting with '0x'.
.IP "\fB\-n, \-\-offset\fR (optional parameter)" 4
.IX Item "-n, --offset (optional parameter)"
The offset into the \s-1NVRAM\s0 area from where to start reading.
The parameter may either be a decimal number or a hexadecimal number starting with '0x'.
.IP "\fB\-f, \-\-filename\fR (optional parameter)" 4
.IX Item "-f, --filename (optional parameter)"
The name of a file the read data will be written into. If no filename is
given the data will be printed to stdout.
.IX Header "SEE ALSO"
\&\fBtpm_nvdefine\fR(8), \fBtpm_nvinfo\fR(8), \fBtpm_nvrelease\fR(8), \fBtpm_nvwrite\fR(8)
Report bugs to <trousers\>