From: Oliver Neukum <oliver@neukum.org>
Organization: Novell
To: Andi Kleen <andi@firstfloor.org>
Subject: Re: Kernelmessage to usbstick?
Date: Sat, 10 Jan 2009 23:58:00 +0100
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Cc: Hans de Bruin <bruinjm@xs4all.nl>, linux-kernel@vger.kernel.org
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Am Saturday 10 January 2009 23:53:15 schrieb Andi Kleen:
> Hans de Bruin <bruinjm@xs4all.nl> writes:
> 
> > Would it be possible to send kernel messages to an usbstick? On
> > poweroff my laptop displays a kernel trace and a final message:
> > poweroff[3114] exited with preempt_count 2
> > /etc/rc.d/rc.0: line 265: 3114 Segementation fault /sbin/poweroff.
> > I don't have a serial cable within reach, but plenty of usbsticks.
> 
> There's a mtdoops.c indeed, but it currently only works on
> MTD controlled flash devices, not usb sticks.
> 
> However usb sticks would need the USB subsystem to be running and it's
> unlikely that will be the case really late in poweroff.  So it might
> not help.

USB in turn needs PCI, interrupts and DMA.

	Regards
		Oliver
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