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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 >channel</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="cache" HREF="cache-command.html"><LINK REL="NEXT" TITLE="cksum" HREF="cksum-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="cache-command.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="cksum-command.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="CHANNEL-COMMAND">channel</H1 ><DIV CLASS="REFNAMEDIV" ><A NAME="AEN3100" ></A ><H2 >Name</H2 >channel -- Select the system console channel</DIV ><DIV CLASS="REFSYNOPSISDIV" ><A NAME="AEN3103"><H2 >Synopsis</H2 ><P ><B CLASS="COMMAND" >channel</B > [-1 | <TT CLASS="REPLACEABLE" ><I >channel_number</I ></TT >]</P ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN3110" ></A ><H2 >Arguments</H2 ><DIV CLASS="INFORMALTABLE" ><A NAME="AEN3112"><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" >-1</TD ><TD WIDTH="25%" ALIGN="LEFT" VALIGN="TOP" > </TD ><TD WIDTH="25%" ALIGN="LEFT" VALIGN="TOP" >Reset the console channel</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" >channel_number</TD ><TD WIDTH="25%" ALIGN="LEFT" VALIGN="TOP" >Number</TD ><TD WIDTH="25%" ALIGN="LEFT" VALIGN="TOP" >Select a channel</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="AEN3137" ></A ><H2 >Description</H2 ><P >With no arguments, the <B CLASS="COMMAND" >channel</B > command displays the current console channel number.</P ><P >When passed an argument of 0 upward, this command switches the console channel to that channel number. The mapping between channel numbers and physical channels is platform specific but will typically be something like channel 0 is the first serial port, channel 1 is the second, etc.</P ><P >When passed an argument of -1, this command reverts RedBoot to responding to whatever channel receives input first, as happens when RedBoot initially starts execution.</P ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN3143" ></A ><H2 >Examples</H2 ><P >Show the current channel. <TABLE BORDER="5" BGCOLOR="#E0E0F0" WIDTH="70%" ><TR ><TD ><PRE CLASS="SCREEN" > RedBoot> <TT CLASS="USERINPUT" ><B >channel</B ></TT > Current console channel id: 0</PRE ></TD ></TR ></TABLE > </P ><P >Change to an invalid channel. <TABLE BORDER="5" BGCOLOR="#E0E0F0" WIDTH="70%" ><TR ><TD ><PRE CLASS="SCREEN" > RedBoot> <TT CLASS="USERINPUT" ><B >channel 99</B ></TT > **Error: bad channel number '99'</PRE ></TD ></TR ></TABLE > </P ><P >Revert to the default channel setting (any console mode). <TABLE BORDER="5" BGCOLOR="#E0E0F0" WIDTH="70%" ><TR ><TD ><PRE CLASS="SCREEN" > RedBoot> <TT CLASS="USERINPUT" ><B >channel -1</B ></TT ></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="cache-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="cksum-command.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >cache</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" >cksum</TD ></TR ></TABLE ></DIV ></BODY ></HTML >
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