Re: can't set hdparm -d1 and correct kernel config

[Jerome BENOIT <jgmbenoit@wanadoo.fr>]

Finally, did it work ?

Benedict Verheyen wrote:
> > > > Hi,
> > > >
> > > > i have 2 matrox hd disks and whenever i want to set the dma to 1 i
> > > > get this error: HDIO_SET_DMA failed: Operation not permitted
> > > > The first is a 40 Gb Matrox IDE and the second a 120 GB Matrox IDE.
> > > > They are recent disks (< 1 year). My motherboard is abit b6, intel
> > > > 440bx chipset PIIX4 IDE. lspci reports that it's a intel 440bx
> > > > chipset (82443 BX/ 82371 EB)
> > > >
> > > > A while ago i recompiled the kernel for LVM support and i think i
> > > > might have excluded something that the kernel needs to set the dma.
> > > > What kernel options do i need to have set in order to allow dma=1?
> > > >
> > > > Thanks.
> > > > Benedict
> > >
> > > > > Use this command to see what kernel options there are and what is 
> > > > > selected in your kernel config file located in  /boot.
> > > > > 'cat /boot/config-<kerel version> |grep DMA' 
> > > > > - -- 
> > > > > Greg Madden
> > > I did this and the only options that were set are
> > > CONFIG_BLK_DEV_IDEDMA_PCI=y
> > > CONFIG_BLK_DEV_IDEDMA=y
> > > All the others are specified as "is not set"
> > > So it seems as if dma is allowed here.
> >
> > Try also to grep for BLK_DEV.  I think, in your case, it would be
> > CONFIG_BLK_DEV_PIIX.
>
>
> Ha! that might be it! cat /boot/config |grep CONFIG_BLK_DEV_PIIX
> returns # CONFIG_BLK_DEV_PIIX is not set
>
> I will try to recompile a new kernel with this option set.
>
> Thanks
> Benedict