linux-kernel - usb debug port documentation

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Message-ID: <1273833076.4950.4.camel@jlt3.sipsolutions.net>
Date:	Fri, 14 May 2010 12:31:16 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Jason Wessel <jason.wessel@...driver.com>,
	Yinghai Lu <yinghai@...nel.org>
Subject: usb debug port documentation

Hi,

I've been looking at
http://www.kernel.org/doc/Documentation/x86/earlyprintk.txt and spent a
while finding everything correctly in place. One of the big unknowns is
what way debug ports are enumerated, so if you have a few USB ports you
end up trying a lot. At the same time, I at least wasn't sure I was
doing everything correctly to start with. It does seem, for example,
that I needed the serial driver built in the kernel too?

In any case, to help others I was wondering if we should start a wiki
page somewhere or so that just lists what port on various machines
people have gotten it to work on? I have a Toshiba Satellite U505 and
earlyprintk=dbgp,keep uses the port on the right-hand side of the
machine... That information could possibly help somebody who is setting
it up for the first time, since it reduces the search space? :)

If there's an appropriate wiki, I'd like to be pointed to it so I can
start a page and submit a kernel patch pointing to it. Otherwise I'll
just create it internally since we all typically use just a handful of
machine types, but it seems like public could help more people.

johannes

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