📄 cksum-command.html

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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"><METANAME="GENERATOR"CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+"><LINKREL="HOME"TITLE="eCos Reference Manual"HREF="ecos-ref.html"><LINKREL="UP"TITLE="Common Commands"HREF="common-commands.html"><LINKREL="PREVIOUS"TITLE="channel"HREF="channel-command.html"><LINKREL="NEXT"TITLE="disks"HREF="disks-command.html"></HEAD><BODYCLASS="REFENTRY"BGCOLOR="#FFFFFF"TEXT="#000000"LINK="#0000FF"VLINK="#840084"ALINK="#0000FF"><DIVCLASS="NAVHEADER"><TABLESUMMARY="Header navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><THCOLSPAN="3"ALIGN="center">eCos Reference Manual</TH></TR><TR><TDWIDTH="10%"ALIGN="left"VALIGN="bottom"><AHREF="channel-command.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="80%"ALIGN="center"VALIGN="bottom"></TD><TDWIDTH="10%"ALIGN="right"VALIGN="bottom"><AHREF="disks-command.html"ACCESSKEY="N">Next</A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><H1><ANAME="CKSUM-COMMAND">cksum</H1><DIVCLASS="REFNAMEDIV"><ANAME="AEN3155"></A><H2>Name</H2>cksum&nbsp;--&nbsp;Compute POSIX checksums</DIV><DIVCLASS="REFSYNOPSISDIV"><ANAME="AEN3158"><H2>Synopsis</H2><P><BCLASS="COMMAND">cksum</B>  {-b <TTCLASS="REPLACEABLE"><I>location</I></TT>} {-l <TTCLASS="REPLACEABLE"><I>length</I></TT>}</P></DIV><DIVCLASS="REFSECT1"><ANAME="AEN3165"></A><H2>Arguments</H2><DIVCLASS="INFORMALTABLE"><ANAME="AEN3167"><P></P><TABLEBORDER="1"CLASS="CALSTABLE"><THEAD><TR><THWIDTH="25%"ALIGN="LEFT"VALIGN="TOP">Name</TH><THWIDTH="25%"ALIGN="LEFT"VALIGN="TOP">Type</TH><THWIDTH="25%"ALIGN="LEFT"VALIGN="TOP">Description</TH><THWIDTH="25%"ALIGN="LEFT"VALIGN="TOP">Default</TH></TR></THEAD><TBODY><TR><TDWIDTH="25%"ALIGN="LEFT"VALIGN="TOP">-b <TTCLASS="REPLACEABLE"><I>location</I></TT></TD><TDWIDTH="25%"ALIGN="LEFT"VALIGN="TOP">Memory address</TD><TDWIDTH="25%"ALIGN="LEFT"VALIGN="TOP">Location in memory for stat of data.</TD><TDWIDTH="25%"ALIGN="LEFT"VALIGN="TOP"><SPANCLASS="emphasis"><ICLASS="EMPHASIS">none</I></SPAN></TD></TR><TR><TDWIDTH="25%"ALIGN="LEFT"VALIGN="TOP">-l <TTCLASS="REPLACEABLE"><I>length</I></TT></TD><TDWIDTH="25%"ALIGN="LEFT"VALIGN="TOP">Number</TD><TDWIDTH="25%"ALIGN="LEFT"VALIGN="TOP">Length of data</TD><TDWIDTH="25%"ALIGN="LEFT"VALIGN="TOP"><SPANCLASS="emphasis"><ICLASS="EMPHASIS">none</I></SPAN></TD></TR></TBODY></TABLE><P></P></DIV></DIV><DIVCLASS="REFSECT1"><ANAME="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><DIVCLASS="REFSECT1"><ANAME="AEN3197"></A><H2>Examples</H2><P>Checksum a buffer.<TABLEBORDER="5"BGCOLOR="#E0E0F0"WIDTH="70%"><TR><TD><PRECLASS="SCREEN"> RedBoot&#62; <TTCLASS="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 baseaddress and length parameters are provided by the precedingload command.<TABLEBORDER="5"BGCOLOR="#E0E0F0"WIDTH="70%"><TR><TD><PRECLASS="SCREEN"> RedBoot&#62; <TTCLASS="USERINPUT"><B>load -r -b %{FREEMEMLO} redboot.bin</B></TT>Raw file loaded 0x06012800-0x0602f0a8RedBoot&#62; <TTCLASS="USERINPUT"><B>cksum</B></TT>Computing cksum for area 0x06012800-0x0602f0a8POSIX cksum = 2092197813 116904 (0x7cb467b5 0x0001c8a8)</PRE></TD></TR></TABLE>       </P></DIV><DIVCLASS="NAVFOOTER"><HRALIGN="LEFT"WIDTH="100%"><TABLESUMMARY="Footer navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top"><AHREF="channel-command.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="ecos-ref.html"ACCESSKEY="H">Home</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top"><AHREF="disks-command.html"ACCESSKEY="N">Next</A></TD></TR><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top">channel</TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="common-commands.html"ACCESSKEY="U">Up</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top">disks</TD></TR></TABLE></DIV></BODY></HTML>
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