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Subject: Re: Instability on Raspberry Pi
From: Ian Lepore <ian@FreeBSD.org>
To: Jia-Shiun Li <jiashiun@gmail.com>
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On Tue, 2013-10-15 at 23:33 +0800, Jia-Shiun Li wrote:
> On Tue, Oct 15, 2013 at 9:46 PM, Ian Lepore <ian@freebsd.org> wrote:
> >
> > It requires that you are using a serial console, and that you have
> >
> >   options       ALT_BREAK_TO_DEBUGGER
> >
> > in your kernel config.  It looks like that's not in the stock RPI-B
> > config.  There's a different break sequence for using a keyboard and
> > video console (and I don't even know what that is, it's not something I
> > ever use).
> 
> I suppose "sysctl debug.kdb.alt_break_to_debugger=1" should be enough
> to enable it at runtime?

Yes, I think it would.  I didn't even know that existed, all the
alt-break code used to be wrapped in #ifdef blocks, now the #ifdef just
controls the default value of that sysctl.

-- Ian