linux-kernel - Re: remote debugging via FireWire

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Message-Id: <200702120749.54976.ak@suse.de>
Date:	Mon, 12 Feb 2007 07:49:54 +0100
From:	Andi Kleen <ak@...e.de>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Stefan Richter <stefanr@...6.in-berlin.de>,
	Bernhard Kaindl <bk@...e.de>, discuss@...-64.org,
	linux1394-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: remote debugging via FireWire

On Sunday 11 February 2007 22:35, Benjamin Herrenschmidt wrote:

> I'd like to have that on ppc as well, so I'd rather keep it in drivers/

This will need some abstraction at least -- there are some early mapping hacks
that are x86 specific right now.

> I agree that it doesn't need to be a module. If you can load modules,
> then you can load the full ohci driver. Thus, if it's an early thingy
> initialized by arch, it can export a special "takeover" hook that the
> proper ohci module can then call to override it (important if we start
> having an irq handler).
> 
> Andi, also, how do you deal with iommu ? Not at all ? :-)

Yes -- it's really early debugging hack mostly. It's reasonable to 
let the iommu be disabled (or later a special bypass can be added for this) 

-Andi
 
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