linux-kernel - Re: [tip:x86/doc] x86/doc: mini-howto for using earlyprintk=dbgp

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Message-ID: <49B02692.3000500@kernel.org>
Date:	Thu, 05 Mar 2009 11:22:58 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Daniel Walker <dwalker@...o99.com>
CC:	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	stern@...land.harvard.edu, randy.dunlap@...cle.com,
	ebiederm@...ssion.com, akpm@...ux-foundation.org, gregkh@...e.de,
	tglx@...utronix.de, sarah.a.sharp@...el.com, mingo@...e.hu,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/doc] x86/doc: mini-howto for using earlyprintk=dbgp

Daniel Walker wrote:
> On Thu, 2009-03-05 at 10:00 +0000, Yinghai Lu wrote:
> 
>> +
>> +Mini-HOWTO for using the earlyprintk=dbgp boot option with a
>> +USB2 Debug port key and a debug cable, on x86 systems.
>> +
>> +You need two computers, the 'USB debug key' special gadget and
>> +and two USB cables, connected like this:
>> +
>> +  [host/target] <-------> [USB debug key] <-------> [client/console]
>> +
>> +1. There are three specific hardware requirements:
>> +
>> + a.) Host/target system needs to have USB debug port capability.
>> +
>> + You can check this capability by looking at a 'Debug port' bit in
>> + the lspci -vvv output:
> 
> ...
> 
>> + c.) Thirdly, you need a second client/console system with a regular USB port.
> 
> You might want to combine a.) and c.) since there is some disconnect
> between the two. c.) doesn't explicitly say a second time that the
> client/console needs the debug port capability ..
> 
> Or say
> 
> a.) You will need two USB ports. One on the client/console system and
> one one the target system.
> 
> b.) The client/console and target USB ports must have the debug port
> capability. You can check for this as follows,
> 
> c.) ...

thanks for checking it.

can you submit patch to Ingo according to tip/master?

YH
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