From: Mark Lord <kernel@teksavvy.com>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: Herbert Poetzl <herbert@13thfloor.at>,
linux-kernel@vger.kernel.org, Bernhard Kaindl <bk@suse.de>,
Andi Kleen <andi@firstfloor.org>,
linux-usb@vger.kernel.org
Subject: Re: debugging a modern laptop ...
Date: Wed, 23 Mar 2011 11:16:10 -0400 [thread overview]
Message-ID: <4D8A0EBA.6060202@teksavvy.com> (raw)
In-Reply-To: <Pine.LNX.4.44L0.1103231102050.2211-100000@iolanthe.rowland.org>
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
prev parent reply other threads:[~2011-03-23 15:16 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-23 3:42 debugging a modern laptop Herbert Poetzl
2011-03-23 4:12 ` Andi Kleen
2011-03-23 15:04 ` Alan Stern
2011-03-23 15:16 ` Mark Lord [this message]
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