linux-kernel - Re: Kernelmessage to usbstick?

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Date:	Sat, 10 Jan 2009 23:58:00 +0100
From:	Oliver Neukum <oliver@...kum.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Hans de Bruin <bruinjm@...all.nl>, linux-kernel@...r.kernel.org
Subject: Re: Kernelmessage to usbstick?

Am Saturday 10 January 2009 23:53:15 schrieb Andi Kleen:
> Hans de Bruin <bruinjm@...all.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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