RE: Why won't my HD do DMA I/O?

From: Steve Snyder (steves@formation.com)
Date: Mon Feb 11 2002 - 14:30:26 EST

I should have noted this in my original post but, yes, I have enabled DMA in
the kernel:

# grep DMA /usr/src/linux-2.4.17/.config | grep -v '#'
CONFIG_BLK_DEV_IDEDMA_PCI=y
CONFIG_BLK_DEV_ADMA=y
CONFIG_IDEDMA_PCI_AUTO=y
CONFIG_BLK_DEV_IDEDMA=y
CONFIG_IDEDMA_AUTO=y

Thanks for the response.

-----Original Message-----
From: Bill Davidsen [mailto:davidsen@tmr.com]
Sent: Monday, February 11, 2002 12:20 PM
To: Steve Snyder
Cc: linux-kernel@vger.kernel.org
Subject: Re: Why won't my HD do DMA I/O?

On Fri, 8 Feb 2002, Steve Snyder wrote:

> I've got a system on which the hard disk cannot be set to use DMA. When I
> attempt to enable DMA ("hdparm -d1 /dev/hda") on this drive, there is a
long
> time-out period, after which displaying the settings shows that DMA is
still
> not set.

You did build this kernel with DMA support in the kernel, right? For your
chipset? Vendor kernels have been known to err on the side of safty. 

--
bill davidsen <davidsen@tmr.com>
  CTO, TMR Associates, Inc
Doing interesting things with little computers since 1979.

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This archive was generated by hypermail 2b29 : Fri Feb 15 2002 - 21:00:41 EST