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

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Date:	Wed, 23 Mar 2011 11:16:10 -0400
From:	Mark Lord <kernel@...savvy.com>
To:	Alan Stern <stern@...land.harvard.edu>
CC:	Herbert Poetzl <herbert@...hfloor.at>,
	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 11-03-23 11:04 AM, Alan Stern wrote:
> 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 ...
..
> 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.
..

If you are lucky enough to have an ExpressCard slot on the notebook,
then lots of eBay sellers offer "Oxford chipset" serial/parallel ports
in ExpressCard format.

These provide "true" bus serial ports, which can be used as Linux consoles
for low level kernel debugging, logs, panics, etc..

As a bonus, he parallel ports from the same chips can be used
for homebrew JTAG adapters.

-ml
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