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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           -->
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<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"
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><DIV
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><TABLE
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WIDTH="100%"
BORDER="0"
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><TR
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>eCos Reference Manual</TH
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><HR
ALIGN="LEFT"
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><H1
><A
NAME="CHANNEL-COMMAND">channel</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN3100"
></A
><H2
>Name</H2
>channel&nbsp;--&nbsp;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"
>&nbsp;</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&#62; <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&#62; <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&#62; <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
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ALIGN="right"
VALIGN="top"
>cksum</TD
></TR
></TABLE
></DIV
></BODY
></HTML
>

Line No.	Rev	Author	Line
1	28	unneback	`<!-- Copyright (C) 2003 Red Hat, Inc. -->`
2			`<!-- This material may be distributed only subject to the terms -->`
3			`<!-- and conditions set forth in the Open Publication License, v1.0 -->`
4			`<!-- or later (the latest version is presently available at -->`
5			`<!-- http://www.opencontent.org/openpub/). -->`
6			`<!-- Distribution of the work or derivative of the work in any -->`
7			`<!-- standard (paper) book form is prohibited unless prior -->`
8			`<!-- permission is obtained from the copyright holder. -->`
9			`<HTML`
10			`><HEAD`
11			`><TITLE`
12			`>channel</TITLE`
13			`><meta name="MSSmartTagsPreventParsing" content="TRUE">`
14			`<META`
15			`NAME="GENERATOR"`
16			`CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+`
17			`"><LINK`
18			`REL="HOME"`
19			`TITLE="eCos Reference Manual"`
20			`HREF="ecos-ref.html"><LINK`
21			`REL="UP"`
22			`TITLE="Common Commands"`
23			`HREF="common-commands.html"><LINK`
24			`REL="PREVIOUS"`
25			`TITLE="cache"`
26			`HREF="cache-command.html"><LINK`
27			`REL="NEXT"`
28			`TITLE="cksum"`
29			`HREF="cksum-command.html"></HEAD`
30			`><BODY`
31			`CLASS="REFENTRY"`
32			`BGCOLOR="#FFFFFF"`
33			`TEXT="#000000"`
34			`LINK="#0000FF"`
35			`VLINK="#840084"`
36			`ALINK="#0000FF"`
37			`><DIV`
38			`CLASS="NAVHEADER"`
39			`><TABLE`
40			`SUMMARY="Header navigation table"`
41			`WIDTH="100%"`
42			`BORDER="0"`
43			`CELLPADDING="0"`
44			`CELLSPACING="0"`
45			`><TR`
46			`><TH`
47			`COLSPAN="3"`
48			`ALIGN="center"`
49			`>eCos Reference Manual</TH`
50			`></TR`
51			`><TR`
52			`><TD`
53			`WIDTH="10%"`
54			`ALIGN="left"`
55			`VALIGN="bottom"`
56			`><A`
57			`HREF="cache-command.html"`
58			`ACCESSKEY="P"`
59			`>Prev</A`
60			`></TD`
61			`><TD`
62			`WIDTH="80%"`
63			`ALIGN="center"`
64			`VALIGN="bottom"`
65			`></TD`
66			`><TD`
67			`WIDTH="10%"`
68			`ALIGN="right"`
69			`VALIGN="bottom"`
70			`><A`
71			`HREF="cksum-command.html"`
72			`ACCESSKEY="N"`
73			`>Next</A`
74			`></TD`
75			`></TR`
76			`></TABLE`
77			`><HR`
78			`ALIGN="LEFT"`
79			`WIDTH="100%"></DIV`
80			`><H1`
81			`><A`
82			`NAME="CHANNEL-COMMAND">channel</H1`
83			`><DIV`
84			`CLASS="REFNAMEDIV"`
85			`><A`
86			`NAME="AEN3100"`
87			`></A`
88			`><H2`
89			`>Name</H2`
90			`>channel -- Select the system console channel</DIV`
91			`><DIV`
92			`CLASS="REFSYNOPSISDIV"`
93			`><A`
94			`NAME="AEN3103"><H2`
95			`>Synopsis</H2`
96			`><P`
97			`><B`
98			`CLASS="COMMAND"`
99			`>channel</B`
100			`> [-1 \| <TT`
101			`CLASS="REPLACEABLE"`
102			`><I`
103			`>channel_number</I`
104			`></TT`
105			`>]</P`
106			`></DIV`
107			`><DIV`
108			`CLASS="REFSECT1"`
109			`><A`
110			`NAME="AEN3110"`
111			`></A`
112			`><H2`
113			`>Arguments</H2`
114			`><DIV`
115			`CLASS="INFORMALTABLE"`
116			`><A`
117			`NAME="AEN3112"><P`
118			`></P`
119			`><TABLE`
120			`BORDER="1"`
121			`CLASS="CALSTABLE"`
122			`><THEAD`
123			`><TR`
124			`><TH`
125			`WIDTH="25%"`
126			`ALIGN="LEFT"`
127			`VALIGN="TOP"`
128			`>Name</TH`
129			`><TH`
130			`WIDTH="25%"`
131			`ALIGN="LEFT"`
132			`VALIGN="TOP"`
133			`>Type</TH`
134			`><TH`
135			`WIDTH="25%"`
136			`ALIGN="LEFT"`
137			`VALIGN="TOP"`
138			`>Description</TH`
139			`><TH`
140			`WIDTH="25%"`
141			`ALIGN="LEFT"`
142			`VALIGN="TOP"`
143			`>Default</TH`
144			`></TR`
145			`></THEAD`
146			`><TBODY`
147			`><TR`
148			`><TD`
149			`WIDTH="25%"`
150			`ALIGN="LEFT"`
151			`VALIGN="TOP"`
152			`>-1</TD`
153			`><TD`
154			`WIDTH="25%"`
155			`ALIGN="LEFT"`
156			`VALIGN="TOP"`
157			`> </TD`
158			`><TD`
159			`WIDTH="25%"`
160			`ALIGN="LEFT"`
161			`VALIGN="TOP"`
162			`>Reset the console channel</TD`
163			`><TD`
164			`WIDTH="25%"`
165			`ALIGN="LEFT"`
166			`VALIGN="TOP"`
167			`><SPAN`
168			`CLASS="emphasis"`
169			`><I`
170			`CLASS="EMPHASIS"`
171			`>none</I`
172			`></SPAN`
173			`></TD`
174			`></TR`
175			`><TR`
176			`><TD`
177			`WIDTH="25%"`
178			`ALIGN="LEFT"`
179			`VALIGN="TOP"`
180			`>channel_number</TD`
181			`><TD`
182			`WIDTH="25%"`
183			`ALIGN="LEFT"`
184			`VALIGN="TOP"`
185			`>Number</TD`
186			`><TD`
187			`WIDTH="25%"`
188			`ALIGN="LEFT"`
189			`VALIGN="TOP"`
190			`>Select a channel</TD`
191			`><TD`
192			`WIDTH="25%"`
193			`ALIGN="LEFT"`
194			`VALIGN="TOP"`
195			`><SPAN`
196			`CLASS="emphasis"`
197			`><I`
198			`CLASS="EMPHASIS"`
199			`>none</I`
200			`></SPAN`
201			`></TD`
202			`></TR`
203			`></TBODY`
204			`></TABLE`
205			`><P`
206			`></P`
207			`></DIV`
208			`></DIV`
209			`><DIV`
210			`CLASS="REFSECT1"`
211			`><A`
212			`NAME="AEN3137"`
213			`></A`
214			`><H2`
215			`>Description</H2`
216			`><P`
217			`>With no arguments, the <B`
218			`CLASS="COMMAND"`
219			`>channel</B`
220			`> command displays the current console channel number.</P`
221			`><P`
222			`>When passed an argument of 0 upward, this command switches the console`
223			`channel to that channel number. The mapping between channel numbers and`
224			`physical channels is platform specific but will typically be something like`
225			`channel 0 is the first serial port, channel 1 is the second, etc.</P`
226			`><P`
227			`>When passed an argument of -1, this command reverts RedBoot to responding`
228			`to whatever channel receives input first, as happens when RedBoot initially`
229			`starts execution.</P`
230			`></DIV`
231			`><DIV`
232			`CLASS="REFSECT1"`
233			`><A`
234			`NAME="AEN3143"`
235			`></A`
236			`><H2`
237			`>Examples</H2`
238			`><P`
239			`>Show the current channel.`
240			`<TABLE`
241			`BORDER="5"`
242			`BGCOLOR="#E0E0F0"`
243			`WIDTH="70%"`
244			`><TR`
245			`><TD`
246			`><PRE`
247			`CLASS="SCREEN"`
248			`>`
249			`RedBoot> <TT`
250			`CLASS="USERINPUT"`
251			`><B`
252			`>channel</B`
253			`></TT`
254			`>`
255			`Current console channel id: 0</PRE`
256			`></TD`
257			`></TR`
258			`></TABLE`
259			`> </P`
260			`><P`
261			`>Change to an invalid channel.`
262			`<TABLE`
263			`BORDER="5"`
264			`BGCOLOR="#E0E0F0"`
265			`WIDTH="70%"`
266			`><TR`
267			`><TD`
268			`><PRE`
269			`CLASS="SCREEN"`
270			`>`
271			`RedBoot> <TT`
272			`CLASS="USERINPUT"`
273			`><B`
274			`>channel 99</B`
275			`></TT`
276			`>`
277			`**Error: bad channel number '99'</PRE`
278			`></TD`
279			`></TR`
280			`></TABLE`
281			`> </P`
282			`><P`
283			`>Revert to the default channel setting (any console mode).`
284			`<TABLE`
285			`BORDER="5"`
286			`BGCOLOR="#E0E0F0"`
287			`WIDTH="70%"`
288			`><TR`
289			`><TD`
290			`><PRE`
291			`CLASS="SCREEN"`
292			`>`
293			`RedBoot> <TT`
294			`CLASS="USERINPUT"`
295			`><B`
296			`>channel -1</B`
297			`></TT`
298			`></PRE`
299			`></TD`
300			`></TR`
301			`></TABLE`
302			`>`
303			`</P`
304			`></DIV`
305			`><DIV`
306			`CLASS="NAVFOOTER"`
307			`><HR`
308			`ALIGN="LEFT"`
309			`WIDTH="100%"><TABLE`
310			`SUMMARY="Footer navigation table"`
311			`WIDTH="100%"`
312			`BORDER="0"`
313			`CELLPADDING="0"`
314			`CELLSPACING="0"`
315			`><TR`
316			`><TD`
317			`WIDTH="33%"`
318			`ALIGN="left"`
319			`VALIGN="top"`
320			`><A`
321			`HREF="cache-command.html"`
322			`ACCESSKEY="P"`
323			`>Prev</A`
324			`></TD`
325			`><TD`
326			`WIDTH="34%"`
327			`ALIGN="center"`
328			`VALIGN="top"`
329			`><A`
330			`HREF="ecos-ref.html"`
331			`ACCESSKEY="H"`
332			`>Home</A`
333			`></TD`
334			`><TD`
335			`WIDTH="33%"`
336			`ALIGN="right"`
337			`VALIGN="top"`
338			`><A`
339			`HREF="cksum-command.html"`
340			`ACCESSKEY="N"`
341			`>Next</A`
342			`></TD`
343			`></TR`
344			`><TR`
345			`><TD`
346			`WIDTH="33%"`
347			`ALIGN="left"`
348			`VALIGN="top"`
349			`>cache</TD`
350			`><TD`
351			`WIDTH="34%"`
352			`ALIGN="center"`
353			`VALIGN="top"`
354			`><A`
355			`HREF="common-commands.html"`
356			`ACCESSKEY="U"`
357			`>Up</A`
358			`></TD`
359			`><TD`
360			`WIDTH="33%"`
361			`ALIGN="right"`
362			`VALIGN="top"`
363			`>cksum</TD`
364			`></TR`
365			`></TABLE`
366			`></DIV`
367			`></BODY`
368			`></HTML`
369			`>`

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