From: Paul Gortmaker <paul.gortmaker@windriver.com>
To: John Donnelly <john.d@servergy.com>
Cc: linuxppc-dev@lists.ozlabs.org
Subject: Re: Anyone using SysRQ key sequences on console serial port ?
Date: Sun, 16 Feb 2014 10:56:24 -0500 [thread overview]
Message-ID: <CAP=VYLpgMYaSVjTwJ2Q15XB+nozz=OhAPU85Nb9xG_FdP5dcyA@mail.gmail.com> (raw)
In-Reply-To: <CAGtOQbTRSk32p7U=v9V9GPb_ro+WYbKLLCCfrmdypePcHA++mw@mail.gmail.com>
On Fri, Feb 14, 2014 at 3:42 PM, John Donnelly <john.d@servergy.com> wrote:
> Hi,
>
> I tried using the SysRq hotkey sequence on a serial console -
> 3.11.0-5-powerpc-e500mc system, by issuing a " break " and the system
> immediately wedges after displaying "SysRQ : HELP : " using both "Putty" and
> "Teraterm" terminal emulators. I know the system is dead because my ssh
> sessions stopped too.
Yes it does work -- or at least it _did_ work. Make sure your dts has an entry
compatible = "fsl,ns16550", "ns16550";
since that enables a workaround I'd added for a hardware errata relating
to sending breaks over the serial console. What you describe above
makes me think you aren't getting the workaround enabled.
Paul.
--
>
> http://en.wikipedia.org/wiki/Magic_SysRq_key .
>
>
>
>
> --
>
> Regards,
> John.
>
> --
>
> o Energy-efficiency is #1 reason data centers look to expand. -- Digital
> Realty Trust
> o Green Data Centers spending to increase 300% worldwide by 2016. -- Pike
> Research
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> ng of society as power stations. -- The Economist
>
>
> _______________________________________________
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next prev parent reply other threads:[~2014-02-16 15:57 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-14 20:42 Anyone using SysRQ key sequences on console serial port ? John Donnelly
2014-02-16 15:56 ` Paul Gortmaker [this message]
2014-02-17 19:37 ` Scott Wood
2014-02-18 19:47 ` John Donnelly
2014-02-19 18:42 ` Paul Gortmaker
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