Date: Wed, 14 Jan 2004 00:31:55 -0600
From: Matt Mackall <mpm@selenic.com>
To: George Anzinger <george@mvista.com>
Cc: "Amit S. Kale" <amitkale@emsyssoft.com>, Andrew Morton <akpm@osdl.org>,
       jim.houston@comcast.net, discuss@x86-64.org, ak@suse.de,
       shivaram.upadhyayula@wipro.com, lkml <linux-kernel@vger.kernel.org>,
       Pavel Machek <pavel@ucw.cz>
Subject: Re: [discuss] Re: kgdb for x86_64 2.6 kernels
Message-ID: <20040114063155.GF28521@waste.org>
References: <000e01c3d476$2ebe03a0$4008720a@shivram.wipro.com> <200401101611.53510.amitkale@emsyssoft.com> <400237F0.9020407@mvista.com> <200401122020.08578.amitkale@emsyssoft.com> <40046296.1050702@mvista.com>
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On Tue, Jan 13, 2004 at 01:26:46PM -0800, George Anzinger wrote:
> >
> >Serial interface should be configurable independent of kgdb and may not be 
> >configured if ethernet interface is configured.  Serial interface is far 
> >simpler hence superior for debugging purposes. If it's available, using 
> >ethernet interface is out of question. Ethernet interface can be used when 
> >serial hardware isn't present or is being used for some other purposes.
> >
> I rather think that the serial inteface should be the fall back unless the 
> user has told us at configure time that it is not available.  I am not 
> prepared to make a statment that it is better than eth.  The eth intface 
> should be much faster, but it has its fingers into a large part of the 
> kernel that MAY be the subject of the current session.  Thus, I think that 
> eth may be better, IF one is clearly not involved in debugging those areas 
> of the kernel.  (Which, by the way, we need to enumerate at some point.)

I have in mind creating some other interfaces that will be on a par
with serial for early boot availability. So lets not frame this in
terms of eth vs serial. We can throw a priority int in the config
interface, stuff that in the plug struct, and pick whichever one's
highest and claims to be currently available.

-- 
Matt Mackall : http://www.selenic.com : Linux development and consulting
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