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Date: Wed, 23 Mar 2011 05:12:56 +0100 From: Andi Kleen <andi@...stfloor.org> To: linux-kernel@...r.kernel.org, Bernhard Kaindl <bk@...e.de>, Andi Kleen <andi@...stfloor.org>, linux-usb@...r.kernel.org Subject: Re: debugging a modern laptop ... > most modern devices have at least one usb port, but as far > as I could figure out via google, there is no support for > console or similar over usb (serial or not) atm > (please feel free to correct me here :) There is also USB debugport, but you need a quite expensive cable (~$100) for it. Usually it only works on one of the USB ports. > > after some research, I also found a quite antique project > exploiting the ieee1394 DMA feature, called firescope and > after some issues finding the latest version of the tool and > of course getting a firewire cable, there seems to be some > kind of interaction between the monitoring system and the > device in question, but it seems that a few problems exist > and I didn't manage to get any relevant information that > way yet (please let me know if that is still maintained) It works, but you need to enable it of course. The printk buffer hasn't changed for a long time. The only problem often is that it doesn't support memory >4GB, however it turns out that some LSI chips support >4GB DMA and with those it works too. -Andi -- ak@...ux.intel.com -- Speaking for myself only. -- 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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