<div dir="ltr">I am enable to get one keyboard sequence responded to with the noted change in the dts .<div><br></div><div> for instance: </div><div><br></div><div><div> SysRQ ( Break) c </div><div><br></div><div> Panics .. Which is a good response, and since it doesn't require a return to user mode ( I suspect ) it appears to work. </div>
<div><br></div><div>Any other requests fail to report any information : </div><div><br></div><div> SysRQ (break ) l - list active processes</div><div> m - list memory </div><div><br></div><div> Any additional SysRQ are ignored., and the system appears hung.</div>
<div><br></div><div> On an reference Intel platform, multiple SyqRQ can be issued and the system remains healthy .</div><div><br></div><div><br></div><div><br></div><div> </div><div> </div><div><br>
</div><div> </div></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Mon, Feb 17, 2014 at 1:37 PM, Scott Wood <span dir="ltr"><<a href="mailto:scottwood@freescale.com" target="_blank">scottwood@freescale.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On Sun, 2014-02-16 at 10:56 -0500, Paul Gortmaker wrote:<br>
> On Fri, Feb 14, 2014 at 3:42 PM, John Donnelly <<a href="mailto:john.d@servergy.com">john.d@servergy.com</a>> wrote:<br>
> > Hi,<br>
> ><br>
> > I tried using the SysRq hotkey sequence on a serial console -<br>
> > 3.11.0-5-powerpc-e500mc system, by issuing a " break " and the system<br>
> > immediately wedges after displaying "SysRQ : HELP : " using both "Putty" and<br>
> > "Teraterm" terminal emulators. I know the system is dead because my ssh<br>
> > sessions stopped too.<br>
><br>
> Yes it does work -- or at least it _did_ work. Make sure your dts has an entry<br>
><br>
> compatible = "fsl,ns16550", "ns16550";<br>
><br>
> since that enables a workaround I'd added for a hardware errata relating<br>
> to sending breaks over the serial console. What you describe above<br>
> makes me think you aren't getting the workaround enabled.<br>
<br>
Also make sure CONFIG_SERIAL_8250_FSL is enabled.<br>
<span class="HOEnZb"><font color="#888888"><br>
-Scott<br>
<br>
<br>
</font></span></blockquote></div><br><br clear="all"><div><br></div>-- <br><div dir="ltr"><div style="font-family:Arial;font-size:12px"><span style="border-collapse:collapse"><div style="border-collapse:collapse"><div style="margin:0px;display:inline!important">
<span style="color:rgb(80,0,80);border-collapse:collapse"><font color="#67b545"><b><br></b></font></span></div></div><div style="border-collapse:collapse"><font color="#67b545"><b>Regards,</b></font></div><div style="border-collapse:collapse">
<font color="#67b545"><b> John.</b></font></div><div style="border-collapse:collapse"><font color="#67b545"><b><br></b></font></div><div style="border-collapse:collapse"><div style="margin:0px;display:inline!important"><span style="color:rgb(80,0,80);border-collapse:collapse"><font color="#67b545"><b>--</b></font></span></div>
</div><div style="border-collapse:collapse"><div style="margin:0px;display:inline!important"><span style="color:rgb(80,0,80);border-collapse:collapse"><font color="#67b545"><b><br></b></font></span></div></div><div style="border-collapse:collapse">
<div style="margin:0px;display:inline!important"><span style="color:rgb(80,0,80);border-collapse:collapse"><font color="#67b545"><b>o</b></font> </span><span style="border-collapse:collapse"><font color="#000000">Energy-efficiency is #1 reason data centers look to expand. -- Digital Realty Trust</font></span></div>
</div><div style="border-collapse:collapse"><div style="margin:0px;display:inline!important"><font style="color:rgb(51,204,0)"><b style="color:rgb(103,181,69)">o</b> </font><font color="#000000">Green Data Centers spending to increase 300% worldwide by 2016. -- Pike Research</font></div>
</div></span></div><div style="font-family:Arial;font-size:12px"><div style="margin:0px"><b style="color:rgb(103,181,69)">o </b><font color="#000000">Data Centers have become as vital to the functioni</font><div style="margin:0px;display:inline!important">
<font color="#000000">ng</font><font color="#000000"> of society as power stations. -- The Economist</font></div></div><div style="margin:0px"><br></div></div></div>
</div>