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Top Forums UNIX for Beginners Questions & Answers How to write a value to a physical memory address in bash script? Post 303043660 by rabrandt on Monday 3rd of February 2020 09:33:55 AM
Old 02-03-2020
How to write a value to a physical memory address in bash script?

How would I write a value to a physical memory address?
I was able to read a physical memory address (for example, 0x400) using this line:
Code:
    dd if=/dev/mem count=4 bs=1 skip=$(( 0x400 ))

But I get an error:
Code:
dd: 'standard input': cannot skip to specified offset

when I try to write using this method
Code:
  function T_WRITE2 {
    printf $1 | dd of=/dev/mem count=4 bs=1 skip=$(( 0x400 ))
  }

Any suggestion?

Last edited by Yoda; 02-03-2020 at 02:23 PM..
rabrandt
 

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XSIL2GRAPHICS(1)					User Contributed Perl Documentation					  XSIL2GRAPHICS(1)

NAME
xsil2graphics - generate scripts to load xsil output data files SYNOPSIS
xsil2graphics [options] <xsil_file> DESCRIPTION
Utility program bundled with xmds, used to generate scripts that load simulation output data into either matlab (http://www.mathworks.com) or scilab (http://www.scilab.org), which are then used to manipulate the results further if necessary and then to present the results graphically. Matlab To generate a matlab m-file, from the xsil file data_file.xsil use the command: bash$ xsil2graphics data_file.xsil or bash$ xsil2graphics --matlab data_file.xsil Then at the matlab command prompt: >> data_file Scilab To generate a scilab script file, from the xsil file data_file.xsil use the command: bash$ xsil2graphics --scilab data_file.xsil Then at the scilab command prompt: --> exec('data_file.sci') OPTIONS
-m, --matlab generate matlab m-file script to load data from the xsil data file (the default option) -s, -scilab generate scilab script file to load data from the xsil data file -o, --outfile <out_file> specify an alternative output script filename to the default which is the input xsil filename with the .xsil extension changed to either .m for the matlab m-file or .sci for the scilab script file EXAMPLES
bash$ xsil2graphics nlse.xsil Generates the output nlse.m to load the data into matlab bash$ xsil2graphics -m nlse.xsil Also generates the output nlse.m but explicitly sets matlab to be the output format bash$ xsil2graphics --scilab nlse.xsil Generates the output nlse.sci to load the data into scilab bash$ xsil2graphics --outfile nlse_new.m nlse.xsil Generates the output nlse_new.m to load the data into matlab AUTHORS
Originally written by Greg Collecutt Maintained by Paul Cochrane with code contributed by Joe Hope BUGS
No known bugs. SEE ALSO
xmds(1), loadxsil(1) http://www.xmds.org COPYRIGHT
Copyright (C) 2000-2004 Code contributed by Greg Collecutt, Joseph Hope and Paul Cochrane This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MER- CHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. perl v5.8.2 2004-06-21 XSIL2GRAPHICS(1)
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