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Date: Sun, 11 Jan 2009 13:07:35 -0500 From: Mark Lord <lkml@....ca> To: Oliver Neukum <oliver@...kum.org> Cc: Andi Kleen <andi@...stfloor.org>, Hans de Bruin <bruinjm@...all.nl>, linux-kernel@...r.kernel.org Subject: Re: Kernelmessage to usbstick? Oliver Neukum wrote: > 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. .. Dunno about an oops, but I currently use a USB device to display debug messages from the shutdown procedure, all the way to kernel_halt(). So long as the Oops doesn't kill too much low level stuff, it's probably feasible. Except for the very slow write times for many USB storage devices. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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