From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: David Newall <davidn@davidnewall.com>
Cc: "David P. Reed" <dpreed@reed.com>,
David Woodhouse <dwmw2@infradead.org>,
Rene Herman <rene.herman@keyaccess.nl>,
Zachary Amsden <zach@vmware.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Christer Weinigel <christer@weinigel.se>,
Ondrej Zary <linux@rainbow-software.org>,
Bodo Eggert <7eggert@gmx.de>, Ingo Molnar <mingo@elte.hu>,
Paul Rolland <rol@as2917.net>, Pavel Machek <pavel@ucw.cz>,
Thomas Gleixner <tglx@linutronix.de>,
linux-kernel@vger.kernel.org, Ingo Molnar <mingo@redhat.com>,
rol <rol@witbe.net>
Subject: Re: [linux-kernel] Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.
Date: Thu, 17 Jan 2008 12:02:27 +0000 [thread overview]
Message-ID: <20080117120227.3d09baf5@lxorguk.ukuu.org.uk> (raw)
In-Reply-To: <478EF4C9.8030406@davidnewall.com>
> This is a timing issue, isn't it? How are we synchronising, other than
> by delaying for a (bus-dependant) period? The characteristics of each
> bus are known so a number can be assigned for "one bus cycle", without
> having to use the bus.
The characteristics of the bus are not known. It could be anything
between 6 and about 16MHz. The way you read the bus clock is system
dependant.
The underlying problem is really that over time some of the hardware has
moved from the ISA world into the chipsets. That is why I sent Ingo the
patches for inb_pit/inb_pic and to split ISA 8390 and non ISA 8390
support. Someone has to tackle the CMOS but we are then in a position to
relegant port 0x80 timing use to ISA systems where it is fine.
Alan
next prev parent reply other threads:[~2008-01-17 12:06 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <9BdU5-1YW-9@gated-at.bofh.it>
[not found] ` <9BeZN-3Gf-5@gated-at.bofh.it>
[not found] ` <9BnTB-1As-31@gated-at.bofh.it>
[not found] ` <9BrX4-8go-1@gated-at.bofh.it>
[not found] ` <9BuBG-4eR-51@gated-at.bofh.it>
[not found] ` <9BvRd-6aL-71@gated-at.bofh.it>
[not found] ` <9GRQW-1DX-13@gated-at.bofh.it>
[not found] ` <9GSah-23W-1@gated-at.bofh.it>
[not found] ` <9GSDy-2GD-23@gated-at.bofh.it>
[not found] ` <9GTpK-40d-15@gated-at.bofh.it>
[not found] ` <9GUvy-5H2-11@gated-at.bofh.it>
[not found] ` <9GVKU-7SS-25@gated-at.bofh.it>
2008-01-07 19:38 ` Bodo Eggert
2008-01-07 19:46 ` H. Peter Anvin
2008-01-07 22:02 ` Bodo Eggert
2008-01-07 22:10 ` H. Peter Anvin
2008-01-07 22:27 ` Bodo Eggert
2008-01-07 22:59 ` Rene Herman
2008-01-07 23:24 ` H. Peter Anvin
2008-01-07 23:26 ` Rene Herman
2008-01-08 0:10 ` [linux-kernel] " David P. Reed
2008-01-08 0:13 ` H. Peter Anvin
2008-01-08 1:38 ` David P. Reed
2008-01-08 17:10 ` Ondrej Zary
2008-01-08 17:24 ` David P. Reed
2008-01-08 17:38 ` Ondrej Zary
2008-01-08 18:44 ` David P. Reed
2008-01-08 18:51 ` Alan Cox
2008-01-08 19:15 ` David P. Reed
2008-01-08 19:23 ` Alan Cox
2008-01-08 19:51 ` David P. Reed
2008-01-09 2:52 ` Zachary Amsden
2008-01-09 5:19 ` H. Peter Anvin
2008-01-09 21:53 ` Zachary Amsden
2008-01-09 22:22 ` David P. Reed
2008-01-11 1:36 ` Zachary Amsden
2008-01-11 3:05 ` Rene Herman
2008-01-11 14:35 ` David P. Reed
2008-01-11 14:37 ` Alan Cox
2008-01-11 15:07 ` David P. Reed
2008-01-11 17:54 ` H. Peter Anvin
2008-01-11 14:49 ` Rene Herman
2008-01-14 21:57 ` David Woodhouse
2008-01-14 22:22 ` David P. Reed
2008-01-16 14:36 ` David Newall
2008-01-16 14:55 ` Alan Cox
2008-01-16 19:15 ` David Newall
2008-01-16 20:08 ` Alan Cox
2008-01-17 6:25 ` David Newall
2008-01-17 12:02 ` Alan Cox [this message]
2008-01-17 13:36 ` David Newall
2008-01-17 13:55 ` Rene Herman
2008-01-17 21:58 ` David Newall
2008-01-17 22:13 ` Rene Herman
2008-01-18 13:37 ` David Newall
2008-01-18 14:05 ` Rene Herman
2008-01-17 15:51 ` Alan Cox
2008-01-09 5:30 ` Christer Weinigel
2008-01-09 14:42 ` David P. Reed
2008-01-09 15:27 ` Rene Herman
2008-01-09 18:17 ` Zachary Amsden
2008-01-09 18:18 ` H. Peter Anvin
2008-01-09 20:26 ` Christer Weinigel
2008-01-09 21:59 ` H. Peter Anvin
2008-01-09 18:22 ` Adrian Bunk
2008-01-09 18:27 ` H. Peter Anvin
2008-01-08 19:25 ` Christer Weinigel
2008-01-08 20:28 ` David P. Reed
2008-01-08 21:43 ` Christer Weinigel
2008-01-08 22:24 ` David P. Reed
2008-01-08 18:51 ` Bodo Eggert
2008-01-08 19:13 ` Ondrej Zary
2008-01-09 21:01 ` Matthieu castet
2008-01-08 12:51 ` Bodo Eggert
2008-01-08 13:07 ` [linux-kernel] " David P. Reed
2008-01-08 14:37 ` Alan Cox
2008-01-08 14:09 ` Rene Herman
2008-01-08 14:31 ` Alan Cox
2008-01-07 23:57 ` [linux-kernel] " David P. Reed
2008-01-08 1:58 ` Alan Cox
2008-01-07 23:25 ` Alan Cox
2008-01-08 13:17 ` Bodo Eggert
2008-01-08 14:38 ` Alan Cox
2008-01-08 3:15 ` Christer Weinigel
[not found] <fa.u5p8NBl8IjcycTVVtf0K+YtqNQc@ifi.uio.no>
[not found] ` <fa.NOJkdyuk0c8CAqzZcG+pF1TzhJM@ifi.uio.no>
[not found] ` <fa.YLAHN7jSUo9phsICUHnxilN7/lk@ifi.uio.no>
[not found] ` <fa.SvgVgdNA9oz4F+tQ9MB2VRwr8ck@ifi.uio.no>
[not found] ` <fa.By1MDYK0MY/fwkCWWrAiQCxl5KM@ifi.uio.no>
[not found] ` <fa.97XrGLIGlvAy4P/TB5vHHrfBrIw@ifi.uio.no>
2008-01-10 0:37 ` [linux-kernel] " Robert Hancock
2008-01-10 0:44 ` Rene Herman
2008-01-10 14:41 ` David P. Reed
2007-12-17 13:02 Rene Herman
2007-12-17 17:14 ` H. Peter Anvin
2007-12-17 19:43 ` David P. Reed
2007-12-17 21:25 ` Alan Cox
2008-01-01 15:59 ` David P. Reed
2008-01-01 16:15 ` Alan Cox
2008-01-01 16:43 ` Ingo Molnar
2008-01-01 17:32 ` Alan Cox
2008-01-01 18:45 ` Ingo Molnar
2008-01-01 21:07 ` Alan Cox
2008-01-02 10:04 ` Ingo Molnar
2008-01-02 13:11 ` [linux-kernel] " David P. Reed
2008-01-02 13:21 ` Ingo Molnar
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