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      1 =head1 NAME
      2 
      3 tpm_nvwrite
      4 
      5 =head1 SYNOPSIS
      6 
      7 B<tpm_nvwrite [OPTIONS]>
      8 
      9 =head1 DESCRIPTION
     10 
     11 B<tpm_nvwrite> writes data to an NVRAM area.
     12 The user must provide the index of the NVRAM area as well as the data to
     13 write into the NVRAM area. Optionally an offset into the NVRAM
     14 area can be given where the writing of the data is to start. Similarly
     15 the use may provide the number of bytes to write into the
     16 NVRAM area. Some NVRAM areas only allow write sizes of zero, i.e., NVRAM
     17 area index 0.
     18 If the NVRAM area has permission bits set that require owner or NVRAM area
     19 authentication, then the password must be provided via the password option.
     20 
     21 The following options are supported:
     22 
     23 =over 4
     24 
     25 =item B<-h, --help>
     26 
     27 Display command usage info.
     28 
     29 =item B<-v, --version>
     30 
     31 Display command version info.
     32 
     33 =item B<-l, --log [none|error|info|debug]>
     34 
     35 Set logging level.
     36 
     37 =item B<-u, --unicode>
     38 
     39 Use TSS UNICODE encoding for passwords to comply with applications
     40 using TSS popup boxes
     41 
     42 =item B<-z, --well-known>
     43 
     44 Use a secret of all zeros (20 bytes of zeros) as either the NVRAM area or owner secret.
     45 
     46 =item B<-p, --password>
     47 
     48 Depending on what type of authentication is required for the NVRAM area, this must either
     49 be the NVRAM area or owner password.
     50 
     51 A password may be directly provided for example by using '--password=password' or
     52 -ppassword. If no password is provided then the program will prompt the user for the
     53 password.
     54 
     55 =item B<-i, --index> (optional parameter)
     56 
     57 The index of the NVRAM area.
     58 The parameter may either be a decimal number or a hexadecimal number starting with '0x'.
     59 
     60 =item B<-s, --size>
     61 
     62 The number of bytes to write to the NVRAM area. This parameter may be used to truncating
     63 the data that are for example read from a file.
     64 The parameter may either be a decimal number or a hexadecimal number starting with '0x'.
     65 
     66 =item B<-n, --offset> (optional parameter)
     67 
     68 The offset into the NVRAM area where to start writing.
     69 The parameter may either be a decimal number or a hexadecimal number starting with '0x'.
     70 
     71 =item B<-f, --filename> (optional parameter)
     72 
     73 The name of a file from which to read data and copy them into the NVRAM area.
     74 
     75 =item B<-d, --data> (optional parameter)
     76 
     77 The data to write into the NVRAM area passed in the command line.
     78 
     79 =item B<-m, --fill-value> (optional parameter)
     80 
     81 The byte to fill the NVRAM area with.
     82 
     83 =back
     84 
     85 =head1 SEE ALSO
     86 
     87 B<tpm_nvdefine>(8), B<tpm_nvinfo>(8), B<tpm_nvread>(8), B<tpm_nvrelease>(8)
     88 
     89 =head1 REPORTING BUGS
     90 
     91 Report bugs to <trousers-users (a] lists.sourceforge.net>
     92