linux-kernel - Re: Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.

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Message-ID: <20080109212615.5908fd3c@weinigel.se>
Date:	Wed, 9 Jan 2008 21:26:15 +0100
From:	Christer Weinigel <christer@...nigel.se>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Zachary Amsden <zach@...are.com>,
	Rene Herman <rene.herman@...access.nl>,
	"David P. Reed" <dpreed@...d.com>, Avi Kivity <avi@...ranet.com>,
	Ondrej Zary <linux@...nbow-software.org>,
	Bodo Eggert <7eggert@....de>, Ingo Molnar <mingo@...e.hu>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Paul Rolland <rol@...917.net>, Pavel Machek <pavel@....cz>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	rol <rol@...be.net>
Subject: Re: Re: [PATCH] x86: provide a DMI based port 0x80
 I/O delay override.

On Wed, 09 Jan 2008 10:18:11 -0800
"H. Peter Anvin" <hpa@...or.com> wrote:

> Zachary Amsden wrote:
> > 
> > I'm speaking specifically in terms of 64-bit platforms here.
> > Shouldn't we unconditionally drop outb_p doing extra port I/O on
> > 64-bit architectures?  Especially considering they don't even have
> > an ISA bus where the decode timing could even matter?
> > 
> 
> Why should the bitsize of the CPU matter for this?  It seems one of
> the less meaningful keys for this.

Well, anything that runs x86_64 should be a fairly modern system.
 
> Second, as I have mentioned, I don't believe this is really the case, 
> especially not for the PIT, which is still present -- the PIT 
> *semantics* has explicit timing constraints.
> 
> Third, you still have ISA devices, they're just called LPC or PC104 
> devices these days.

Or PCMCIA.  I'm still a happy user of a Zyxel ZyAIR 100B, it's one of
the most stable cards Wifi I've got running under Linux.   :-)

  /Christer
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