linux-kernel - Re: debugging a modern laptop ...

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Message-ID: <Pine.LNX.4.44L0.1103231102050.2211-100000@iolanthe.rowland.org>
Date:	Wed, 23 Mar 2011 11:04:47 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Herbert Poetzl <herbert@...hfloor.at>
cc:	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 ...

On Wed, 23 Mar 2011, Herbert Poetzl wrote:

> 
> 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 :)

There _is_ support for a USB console (see CONFIG_USB_SERIAL_CONSOLE).  
However it may not be useful for diagnosing problems during boot,
because obviously the console won't operate until the USB stack is in
place and running.

Alan Stern

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