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

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Date:	Tue, 8 Jan 2008 18:38:11 +0100
From:	Ondrej Zary <linux@...nbow-software.org>
To:	"David P. Reed" <dpreed@...d.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Rene Herman <rene.herman@...access.nl>,
	Bodo Eggert <7eggert@....de>,
	Christer Weinigel <christer@...nigel.se>,
	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@...be.net
Subject: Re: Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.

On Tuesday 08 January 2008 18:24:02 David P. Reed wrote:
> Windows these days does delays with timing loops or the scheduler.  It
> doesn't use a "port".  Also, Windows XP only supports machines that tend
> not to have timing problems that use delays.  Instead, if a device takes
> a while to respond, it has a "busy bit" in some port or memory slot that
> can be tested.

Windows XP can run on a machine with ISA slot(s) and has built-in drivers for 
some plug&play ISA cards - e.g. the famous 3Com EtherLink III. I think that 
there's a driver for NE2000-compatible cards too and it probably works.

> Almost all of the issues in Linux where _p operations are used are (or
> should be) historical - IMO.
>
> Ondrej Zary wrote:
> > On Tuesday 08 January 2008 02:38:15 David P. Reed wrote:
> >> H. Peter Anvin wrote:
> >>> And shoot the designer of this particular microcontroller firmware.
> >>
> >> Well, some days I want to shoot the "designer" of the entire Wintel
> >> architecture...  it's not exactly "designed" by anybody of course, and
> >> today it's created largely by a collection of Taiwanese and Chinese ODM
> >> firms, coupled with Microsoft WinHEC and Intel folks.  At least they
> >> follow the rules and their ACPI and BIOS code say that they are using
> >> port 80 very clearly if you use PnP and ACPI properly.  And in the old
> >> days, you were "supposed" to use the system BIOS to talk to things like
> >> the PIT that had timing issues, not write your own code.
> >
> > Does anyone know what port does Windows use? I'm pretty sure that it
> > isn't 80h as I run Windows 98 often with port 80h debug card inserted.
> > The last POST code set by BIOS usually remains on the display and only
> > changes when BIOS does something like suspend/resume. IIRC, there was a
> > program that was able to display temperature from onboard sensors on the
> > port 80h display that's integrated on some mainboards.
>
> --
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-- 
Ondrej Zary
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