From: William Park <opengeometry@yahoo.ca>
To: linux-kernel@vger.kernel.org
Subject: DMA in PCI chipset -- module vs. compiled-in
Date: Sun, 5 Feb 2006 22:43:12 -0500 [thread overview]
Message-ID: <20060206034312.GA2962@node1.opengeometry.net> (raw)
Dear experts,
Normally, my PCI chipset (ie. via82cxxx, hpt366) are compiled in, and it
correctly enables DMA of my harddisk.
But, for experiment, I tried compiling in only the "generic" options,
and moved all specific PCI chipsets as modules. Hotplug loads the
modules, but with all 'hdparm' options turned off. When I tried turning
on DMA,
$ hdparm -m 16 -c 1 -u 1 -d 1 /dev/hda
I get
/dev/hda:
setting 32-bit IO_support flag to 1
setting multcount to 16
setting unmaskirq to 1 (on)
setting using_dma to 1 (on)
HDIO_SET_DMA failed: Operation not permitted
multcount = 16 (on)
IO_support = 1 (32-bit)
unmaskirq = 1 (on)
using_dma = 0 (off)
Is this normal? How do I turn on DMA, if I load my PCI chipset as
module?
--
William Park <opengeometry@yahoo.ca>, Toronto, Canada
ThinFlash: Linux thin-client on USB key (flash) drive
http://home.eol.ca/~parkw/thinflash.html
BashDiff: Super Bash shell
http://freshmeat.net/projects/bashdiff/
next reply other threads:[~2006-02-06 3:43 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-06 3:43 William Park [this message]
2006-02-06 4:32 ` DMA in PCI chipset -- module vs. compiled-in Lee Revell
2006-02-06 19:31 ` Ingo Oeser
2006-02-06 20:26 ` Lee Revell
2006-02-06 19:49 ` Alan Cox
2006-02-06 20:25 ` Lee Revell
2006-02-07 8:14 ` Bartlomiej Zolnierkiewicz
2006-02-07 11:07 ` Alan Cox
2006-02-07 11:14 ` Bartlomiej Zolnierkiewicz
2006-02-08 4:37 ` William Park
2006-02-07 2:04 ` William Park
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