From: Bodo Eggert <harvested.in.lkml@7eggert.dyndns.org>
To: Jean Delvare <khali@linux-fr.org>, LKML <linux-kernel@vger.kernel.org>
Subject: Re: Paused I/O versus regular I/O
Date: Sun, 27 Nov 2005 01:52:49 +0100 [thread overview]
Message-ID: <E1EgAmg-00012X-4S@be1.lrz> (raw)
In-Reply-To: <5dato-1qR-9@gated-at.bofh.it>
Jean Delvare <khali@linux-fr.org> wrote:
> Could anyone tell me what the difference is between "paused" I/O
> (inb_p, oub_p and friends) and regular I/O (inb, oub and friends)? I
> understand that the former includes some delays here and there, but how
> do I know when to use the paused variant, and when the non-paused
> variant is OK?
AFAIK, some old hardware needs it. The original ISA bus speed was 4.77 MHz,
and AT changed it to 8 MHz. Some chips needed extra delays to compensate,
and those chips stayed around for a long time.
--
Ich danke GMX dafür, die Verwendung meiner Adressen mittels per SPF
verbreiteten Lügen zu sabotieren.
next parent reply other threads:[~2005-11-27 1:04 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <5dato-1qR-9@gated-at.bofh.it>
2005-11-27 0:52 ` Bodo Eggert [this message]
2005-11-26 15:40 Jean Delvare
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