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<!-- Copyright (C) 2003 Red Hat, Inc. --> <!-- This material may be distributed only subject to the terms --> <!-- and conditions set forth in the Open Publication License, v1.0 --> <!-- or later (the latest version is presently available at --> <!-- http://www.opencontent.org/openpub/). --> <!-- Distribution of the work or derivative of the work in any --> <!-- standard (paper) book form is prohibited unless prior --> <!-- permission is obtained from the copyright holder. --> <HTML ><HEAD ><TITLE >cksum</TITLE ><meta name="MSSmartTagsPreventParsing" content="TRUE"> <META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+ "><LINK REL="HOME" TITLE="eCos Reference Manual" HREF="ecos-ref.html"><LINK REL="UP" TITLE="Common Commands" HREF="common-commands.html"><LINK REL="PREVIOUS" TITLE="channel" HREF="channel-command.html"><LINK REL="NEXT" TITLE="disks" HREF="disks-command.html"></HEAD ><BODY CLASS="REFENTRY" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >eCos Reference Manual</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="channel-command.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="disks-command.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="CKSUM-COMMAND">cksum</H1 ><DIV CLASS="REFNAMEDIV" ><A NAME="AEN3155" ></A ><H2 >Name</H2 >cksum -- Compute POSIX checksums</DIV ><DIV CLASS="REFSYNOPSISDIV" ><A NAME="AEN3158"><H2 >Synopsis</H2 ><P ><B CLASS="COMMAND" >cksum</B > {-b <TT CLASS="REPLACEABLE" ><I >location</I ></TT >} {-l <TT CLASS="REPLACEABLE" ><I >length</I ></TT >}</P ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN3165" ></A ><H2 >Arguments</H2 ><DIV CLASS="INFORMALTABLE" ><A NAME="AEN3167"><P ></P ><TABLE BORDER="1" CLASS="CALSTABLE" ><THEAD ><TR ><TH WIDTH="25%" ALIGN="LEFT" VALIGN="TOP" >Name</TH ><TH WIDTH="25%" ALIGN="LEFT" VALIGN="TOP" >Type</TH ><TH WIDTH="25%" ALIGN="LEFT" VALIGN="TOP" >Description</TH ><TH WIDTH="25%" ALIGN="LEFT" VALIGN="TOP" >Default</TH ></TR ></THEAD ><TBODY ><TR ><TD WIDTH="25%" ALIGN="LEFT" VALIGN="TOP" >-b <TT CLASS="REPLACEABLE" ><I >location</I ></TT ></TD ><TD WIDTH="25%" ALIGN="LEFT" VALIGN="TOP" >Memory address</TD ><TD WIDTH="25%" ALIGN="LEFT" VALIGN="TOP" >Location in memory for stat of data.</TD ><TD WIDTH="25%" ALIGN="LEFT" VALIGN="TOP" ><SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >none</I ></SPAN ></TD ></TR ><TR ><TD WIDTH="25%" ALIGN="LEFT" VALIGN="TOP" >-l <TT CLASS="REPLACEABLE" ><I >length</I ></TT ></TD ><TD WIDTH="25%" ALIGN="LEFT" VALIGN="TOP" >Number</TD ><TD WIDTH="25%" ALIGN="LEFT" VALIGN="TOP" >Length of data</TD ><TD WIDTH="25%" ALIGN="LEFT" VALIGN="TOP" ><SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >none</I ></SPAN ></TD ></TR ></TBODY ></TABLE ><P ></P ></DIV ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN3194" ></A ><H2 >Description</H2 ><P >Computes the POSIX checksum on a range of memory (either RAM or FLASH). The values printed (decimal cksum, decimal length, hexadecimal cksum, hexadecimal length) can be compared with the output from the Linux program 'cksum'.</P ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN3197" ></A ><H2 >Examples</H2 ><P >Checksum a buffer. <TABLE BORDER="5" BGCOLOR="#E0E0F0" WIDTH="70%" ><TR ><TD ><PRE CLASS="SCREEN" > RedBoot> <TT CLASS="USERINPUT" ><B >cksum -b 0x100000 -l 0x100</B ></TT > POSIX cksum = 3286483632 256 (0xc3e3c2b0 0x00000100)</PRE ></TD ></TR ></TABLE > </P ><P >Checksum an area of memory after loading a file. Note that the base address and length parameters are provided by the preceding load command. <TABLE BORDER="5" BGCOLOR="#E0E0F0" WIDTH="70%" ><TR ><TD ><PRE CLASS="SCREEN" > RedBoot> <TT CLASS="USERINPUT" ><B >load -r -b %{FREEMEMLO} redboot.bin</B ></TT > Raw file loaded 0x06012800-0x0602f0a8 RedBoot> <TT CLASS="USERINPUT" ><B >cksum</B ></TT > Computing cksum for area 0x06012800-0x0602f0a8 POSIX cksum = 2092197813 116904 (0x7cb467b5 0x0001c8a8)</PRE ></TD ></TR ></TABLE > </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="channel-command.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ecos-ref.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="disks-command.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >channel</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="common-commands.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >disks</TD ></TR ></TABLE ></DIV ></BODY ></HTML >