linux-kernel - Re: [patch 5/5] x86: Set PCI config space size to extended for AMD Barcelona

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Message-ID:  <mj+md-20070903.190044.18705.albireo@ucw.cz>
Date:	Mon, 3 Sep 2007 21:01:24 +0200
From:	Martin Mares <mj@....cz>
To:	dean gaudet <dean@...tic.org>
Cc:	Robert Richter <robert.richter@....com>, Andi Kleen <ak@...e.de>,
	patches@...-64.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 5/5] x86: Set PCI config space size to extended for AMD Barcelona

Hi!

> it's so very unfortunate the PCI standard has no feature bit to indicate 
> the presence of ECS.
> 
> FWIW in my testing on a range of machines spanning 7 or 8 years i could 
> read config space reg 256... and get 0xffffffff when the device didn't 
> support ECS, and get valid data when the device did support ECS... granted 
> there may be some system out there which behaves really badly when you do 
> this.
> 
> perhaps someone could write a userspace program and test that concept on a 
> far wider range of machines.

If you want to experiment with this in user space, it's easy to write
a couple of access functions for the libpci in pciutils. (Patches welcome,
as usually :) )

				Have a nice fortnight
-- 
Martin `MJ' Mares                          <mj@....cz>   http://mj.ucw.cz/
Faculty of Math and Physics, Charles University, Prague, Czech Rep., Earth
God is real, unless declared integer.
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