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Magic SysRq Key - Revision history
2026-04-28T02:27:32Z
Revision history for this page on the wiki
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http://wikilegacy.armadeus.com/index.php?title=Magic_SysRq_Key&diff=10304&oldid=prev
JulienB: /* From any terminal on the APF */
2011-12-08T13:42:55Z
<p><span class="autocomment">From any terminal on the APF</span></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 15:42, 8 December 2011</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>===From any terminal on the APF===</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>===From any terminal on the APF===</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>* Send the character to corresponding /proc interface. For example to reset the board:</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>* Send the character to corresponding <ins style="font-weight: bold; text-decoration: none;">''</ins>/proc<ins style="font-weight: bold; text-decoration: none;">'' </ins>interface. For example to reset the board:</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><pre class="apf"></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><pre class="apf"></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div># echo b > /proc/sysrq-trigger</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div># echo b > /proc/sysrq-trigger</div></td></tr>
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<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">===From the LCD pseudo terminal with an USB keyboard===</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">* To Be Tested...</ins></div></td></tr>
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JulienB
http://wikilegacy.armadeus.com/index.php?title=Magic_SysRq_Key&diff=10303&oldid=prev
JulienB: New page: ==Introduction== Excerpt from Linux's Documentation/sysreq.txt:<br> ''What is the magic SysRq key?'' ''It is a 'magical' key combo you can hit which the kernel will respond to regardless ...
2011-12-08T11:08:15Z
<p>New page: ==Introduction== Excerpt from Linux's Documentation/sysreq.txt:<br> ''What is the magic SysRq key?'' ''It is a 'magical' key combo you can hit which the kernel will respond to regardless ...</p>
<p><b>New page</b></p><div>==Introduction==<br />
Excerpt from Linux's Documentation/sysreq.txt:<br><br />
''What is the magic SysRq key?''<br />
<br />
''It is a 'magical' key combo you can hit which the kernel will respond to regardless of whatever else it is doing, unless it is completely locked up.''<br />
<br />
==Usage==<br />
* Check it is enabled:<br />
<pre class="apf"><br />
# cat /proc/sys/kernel/sysrq <br />
1<br />
</pre><br />
<br />
===From Host serial console with Kermit===<br />
* Send break character (Ctrl-\ b) then the key corresponding to the wanted action. For example to reset the board you will press:<br />
Ctrl+AltGr+8 then b then b<br />
<br />
===From any terminal on the APF===<br />
* Send the character to corresponding /proc interface. For example to reset the board:<br />
<pre class="apf"><br />
# echo b > /proc/sysrq-trigger<br />
</pre></div>
JulienB