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From: Bartlomiej Zolnierkiewicz <B.Zolnierkiewicz@elka.pw.edu.pl>
To: Santiago Garcia Mantinan <lkml@manty.net>
Subject: Re: IDE DMA setting not available on 2.4.23 as a module
Date: Sun, 30 Nov 2003 21:15:07 +0100
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Do you have piix.o module loaded or PIIX support compiled-in?

--bart

On Sunday 30 of November 2003 20:58, Santiago Garcia Mantinan wrote:
> Hi!
>
> Yesterday I started to upgrade my systems to 2.4.23, some of them were
> already running pre or rc versions, but when I tried my Pentium MMX wich
> boots out of SCSI and on which I like to have IDE driver as a module, I
> found that the DMA setting was not working, hdparm was saying:
>
>  setting using_dma to 1 (on)
>  HDIO_SET_DMA failed: Operation not permitted
>
> So I changed the driver option to set DMA by default to ON, but nothing
> changed, still the same problem, then I tried to compile the IDE driver
> into the kernel instead of having it as a module and then the dma support
> started to work, either having the driver enable it by default or by
> setting it with hdparm.
>
> The motherboard uses a 430TX chipset, thus with a PIIX4 IDE controller.
>
> Is this a bug or is this a known and accepted limitation of having the IDE
> driver as a module?
>
> If you want me to test any patch to see if we can fix this, or need any
> more info, don't hesitate to contact me.
>
> Regards...