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Date:	Wed, 29 Nov 2006 12:13:12 -0800
From:	Stephen Hemminger <shemminger@...l.org>
To:	David Kimdon <david.kimdon@...icescape.com>
Cc:	Michael Buesch <mb@...sch.de>,
	David Kimdon <david.kimdon@...icescape.com>,
	Nick Kossifidis <mickflemm@...il.com>,
	Daniel Drake <ddrake@...ntes3d.com>, netdev@...r.kernel.org,
	madwifi-devel@...ts.sourceforge.net
Subject: Re: [Madwifi-devel] ar5k and Atheros AR5005G

On Wed, 29 Nov 2006 08:03:28 -0800
David Kimdon <david.kimdon@...icescape.com> wrote:

> On Wed, Nov 29, 2006 at 04:38:56PM +0100, Michael Buesch wrote:
> > On Wednesday 29 November 2006 16:24, David Kimdon wrote:
> > > On Wed, Nov 29, 2006 at 04:12:33PM +0100, Michael Buesch wrote:
> > > > On Wednesday 29 November 2006 15:34, Nick Kossifidis wrote:
> > > Why do you say that?
> > > 
> > > There is absolutely no reason why dadwifi can't be merged into the
> > > mainline once the hal issue is resolved. 
> > 
> > Last time we talked about that stuff, it was decided that
> > we don't want a HAL... See archives.
> 
> To be clear, that is all part of the hal issue that needs to be
> resolved.  Removing the hal abstraction is not difficult for an
> interested party once source for the hal is available.  The next step
> in such an effort would be to add an open hal to dadwifi, IMO.
> 

Isn't it obvious. Planning from goal through intermediate steps gives:

0 - today (raw materials)
	* softmac stack: d80211
	* open hal: ar5k
	* glue layer: dadwifi

1- put pieces together
	* d80211 + dadwifi + ar5k

2 - release working code to d80211 tree

3 - hard link dad2ifi to ar5k (one module)

4 - collapse indirect calls and refactor

5 - lather rinse repeat in public d80211 tree

...

8 - resulting in atheros driver kernel module

9 - code ready in d80211


10 - mainline integration of working driver for Atheros
     using common softmac stack

> 
> P.S. Actually, it isn't clear to me that removing the hal entirely is
> a good idea.  Abstractions exist for practical reasons.  The hal
> allows dadwifi to support a variety of Atheros chips without needing
> to worry about the specific details of each chip.

Abstractions that deal with hardware are good. See phylib.
Abstractions that try to deal with operating system independence are 
gross.



-- 
Stephen Hemminger <shemminger@...l.org>
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