[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <4782AED5.1060406@keyaccess.nl>
Date: Mon, 07 Jan 2008 23:59:33 +0100
From: Rene Herman <rene.herman@...access.nl>
To: Bodo Eggert <7eggert@....de>
CC: "H. Peter Anvin" <hpa@...or.com>,
Christer Weinigel <christer@...nigel.se>,
Ingo Molnar <mingo@...e.hu>,
Alan Cox <alan@...rguk.ukuu.org.uk>,
"David P. Reed" <dpreed@...d.com>,
Rene Herman <rene.herman@...il.com>,
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: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.
On 07-01-08 23:27, Bodo Eggert wrote:
> On Mon, 7 Jan 2008, H. Peter Anvin wrote:
>> There might have been a few 386/20's clocking the ISA bus at ÷3 (6.67
>> MHz) rather than ÷2 (10 MHz) or ÷2.5 (8 MHz).
>
> Yes, and the remaining users should set the kernel option. Both of them.
> The question is: How will they be told about the new kernel option?
What exactly are you guys still talking about? Alan is looking at drivers
and finds that in them outb_p is generally correct and correctly specified
in bus-clocks for at least some (8390 was quoted). In those legacy drivers,
the _p ops can simply stay and can use the 15-year old proven 0x80 outb.
(with molnar suggesting they be renamed isa_in/outb_p and me suggesting that
if someone would be doing _that_ they might as well split them manually in
outb(); slow_down_io() possibly renaming slow_down_io() to isa_io_delay() or
similar).
Is this only about the ones then left for things like legacy PIC and PIT?
Does anyone care about just sticking in a udelay(2) (or 1) there as a
replacement and call it a day?
Rene.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists