From: Pete Zaitcev <zaitcev@redhat.com>
To: Bill Davidsen <davidsen@tmr.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Safety of IRQ during i/o
Date: Wed, 24 Jul 2002 18:37:28 -0400 [thread overview]
Message-ID: <200207242237.g6OMbSO10262@devserv.devel.redhat.com> (raw)
In-Reply-To: <mailman.1027541521.16533.linux-kernel2news@redhat.com>
>[...]
> I would think that this would be safe when using DMA, and likely to be
> safe for PIO and more recent chipsets, but I wouldn't want to actually
> tell anyone that.
A little story from OLS. I have a 486/75 laptop, which can only
do PIO. It always was losing characters evern on 9600 baud on its
serial port, and I thought it was simply broken for five years.
A guy who did a security talk showed me that doing hdparm -u
fixes the problem. Apparently, the lappy has a non-buffering UART.
So, it seems that hdparm -u is a very useful thing for obsotele
boxes. If you do DMA, you probably do not care.
-- Pete
next parent reply other threads:[~2002-07-24 22:35 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <mailman.1027541521.16533.linux-kernel2news@redhat.com>
2002-07-24 22:37 ` Pete Zaitcev [this message]
2002-07-24 22:42 ` Safety of IRQ during i/o Bartlomiej Zolnierkiewicz
2002-07-25 7:54 ` Marcin Dalecki
2002-07-25 10:26 ` Alan Cox
2002-07-25 9:34 ` Marcin Dalecki
2002-07-25 11:15 ` Roger Larsson
2002-07-25 11:17 ` Bill Davidsen
2002-07-26 0:34 ` Marcin Dalecki
2002-07-24 19:58 Bill Davidsen
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