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Date: Wed, 23 Mar 2011 04:42:14 +0100 From: Herbert Poetzl <herbert@...hfloor.at> To: linux-kernel@...r.kernel.org Cc: Bernhard Kaindl <bk@...e.de>, Andi Kleen <andi@...stfloor.org>, linux-usb@...r.kernel.org Subject: debugging a modern laptop ... Greetings! I'm trying to evaluate my options on debugging a recent laptop/notebook/table (and the Linux kernel on it of course) from early bootup to diagnostics when the machine has locked up ... normally the first thing I would do is to attach a serial console to monitor the early bootup and have some way to send sysrq triggers ... but here is the first problem, the thing might not even have a serial port at all ... 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 :) 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) finally, ethernet and netconsole, which seems to work reasonably well, at least for the console logging part but requires at least a supported 'wired' ethernet interface and a few tricks to send commands to the device ... (but only partially suited or early bootup of course) have I missed something? what about bluetooth? (usually requires USB) what about wireless? (probably quite problematic) maybe a new kind of debug interface is needed in the near future? any ideas and real world experiences are more than welcome ... many thanks in advance, Herbert -- 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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