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